forked from AbleOS/holey-bytes
Compare commits
42 commits
master
...
wip/its-no
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131
Cargo.lock
generated
131
Cargo.lock
generated
|
|
@ -13,40 +13,29 @@ dependencies = [
|
|||
"version_check",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "allocator-api2"
|
||||
version = "0.2.16"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0942ffc6dcaadf03badf6e6a2d0228460359d5e34b57ccdc720b7382dfbd5ec5"
|
||||
|
||||
[[package]]
|
||||
name = "ariadne"
|
||||
version = "0.3.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "72fe02fc62033df9ba41cba57ee19acf5e742511a140c7dbc3a873e19a19a1bd"
|
||||
dependencies = [
|
||||
"unicode-width",
|
||||
"yansi",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "beef"
|
||||
version = "0.5.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "3a8241f3ebb85c056b509d4327ad0358fbbba6ffb340bf388f26350aeda225b1"
|
||||
|
||||
[[package]]
|
||||
name = "bytemuck"
|
||||
version = "1.13.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "17febce684fd15d89027105661fec94afb475cb995fbc59d2865198446ba2eea"
|
||||
|
||||
[[package]]
|
||||
name = "cfg-if"
|
||||
version = "1.0.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
|
||||
|
||||
[[package]]
|
||||
name = "delegate"
|
||||
version = "0.9.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "d358e0ec5c59a5e1603b933def447096886121660fc680dc1e64a0753981fe3c"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn 1.0.109",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "fnv"
|
||||
version = "1.0.7"
|
||||
|
|
@ -62,26 +51,12 @@ dependencies = [
|
|||
"ahash",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "hashbrown"
|
||||
version = "0.14.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "2c6201b9ff9fd90a5a3bac2e56a830d0caa509576f0e503818ee82c181b3437a"
|
||||
dependencies = [
|
||||
"ahash",
|
||||
"allocator-api2",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "hbasm"
|
||||
version = "0.1.0"
|
||||
dependencies = [
|
||||
"ariadne",
|
||||
"bytemuck",
|
||||
"hashbrown 0.14.0",
|
||||
"hbbytecode",
|
||||
"lasso",
|
||||
"literify",
|
||||
"logos",
|
||||
"paste",
|
||||
]
|
||||
|
|
@ -94,7 +69,12 @@ version = "0.1.0"
|
|||
name = "hbvm"
|
||||
version = "0.1.0"
|
||||
dependencies = [
|
||||
"delegate",
|
||||
"hashbrown",
|
||||
"hbbytecode",
|
||||
"log",
|
||||
"paste",
|
||||
"static_assertions",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -103,28 +83,16 @@ version = "0.7.2"
|
|||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "4644821e1c3d7a560fe13d842d13f587c07348a1a05d3a797152d41c90c56df2"
|
||||
dependencies = [
|
||||
"ahash",
|
||||
"hashbrown 0.13.2",
|
||||
"hashbrown",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "literify"
|
||||
version = "0.1.0"
|
||||
name = "log"
|
||||
version = "0.4.17"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "54e4d365df794ed78b4ce1061886f82eae7afa8e3a98ce4c4b0bfd0c777b1175"
|
||||
checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
|
||||
dependencies = [
|
||||
"litrs",
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "litrs"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "4f17c3668f3cc1132437cdadc93dab05e52d592f06948d3f64828430c36e4a70"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"cfg-if",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -147,7 +115,7 @@ dependencies = [
|
|||
"proc-macro2",
|
||||
"quote",
|
||||
"regex-syntax",
|
||||
"syn",
|
||||
"syn 2.0.18",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -161,30 +129,30 @@ dependencies = [
|
|||
|
||||
[[package]]
|
||||
name = "once_cell"
|
||||
version = "1.18.0"
|
||||
version = "1.17.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
|
||||
checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
|
||||
|
||||
[[package]]
|
||||
name = "paste"
|
||||
version = "1.0.14"
|
||||
version = "1.0.12"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "de3145af08024dea9fa9914f381a17b8fc6034dfb00f3a84013f7ff43f29ed4c"
|
||||
checksum = "9f746c4065a8fa3fe23974dd82f15431cc8d40779821001404d10d2e79ca7d79"
|
||||
|
||||
[[package]]
|
||||
name = "proc-macro2"
|
||||
version = "1.0.66"
|
||||
version = "1.0.59"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
|
||||
checksum = "6aeca18b86b413c660b781aa319e4e2648a3e6f9eadc9b47e9038e6fe9f3451b"
|
||||
dependencies = [
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "quote"
|
||||
version = "1.0.33"
|
||||
version = "1.0.28"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
|
||||
checksum = "1b9ab9c7eadfd8df19006f1cf1a4aed13540ed5cbc047010ece5826e10825488"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
]
|
||||
|
|
@ -196,10 +164,27 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
|
|||
checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "2.0.29"
|
||||
name = "static_assertions"
|
||||
version = "1.1.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c324c494eba9d92503e6f1ef2e6df781e78f6a7705a0202d9801b198807d518a"
|
||||
checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "1.0.109"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "2.0.18"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "32d41677bcbe24c20c52e7c70b0d8db04134c5d1066bf98662e2871ad200ea3e"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
|
|
@ -208,24 +193,12 @@ dependencies = [
|
|||
|
||||
[[package]]
|
||||
name = "unicode-ident"
|
||||
version = "1.0.11"
|
||||
version = "1.0.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
|
||||
|
||||
[[package]]
|
||||
name = "unicode-width"
|
||||
version = "0.1.10"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
|
||||
checksum = "b15811caf2415fb889178633e7724bad2509101cde276048e013b9def5e51fa0"
|
||||
|
||||
[[package]]
|
||||
name = "version_check"
|
||||
version = "0.9.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
|
||||
|
||||
[[package]]
|
||||
name = "yansi"
|
||||
version = "0.5.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "09041cd90cf85f7f8b2df60c646f853b7f535ce68f85244eb6731cf89fa498ec"
|
||||
|
|
|
|||
|
|
@ -1,3 +1,2 @@
|
|||
[workspace]
|
||||
resolver = "2"
|
||||
members = ["hbasm", "hbbytecode", "hbvm"]
|
||||
members = ["hbasm", "hbbytecode", "hbvm"]
|
||||
|
|
|
|||
4
assets/example.asm
Normal file
4
assets/example.asm
Normal file
|
|
@ -0,0 +1,4 @@
|
|||
load 0 a0 ;; 05 00 A0
|
||||
load 10 a1 ;; 05 10 A1
|
||||
add a0 1 a0 ;; 01 A0 01 A0
|
||||
jump_neq a0 a1 0 ;; a1 A0 A1 0
|
||||
4
assets/example.bytes
Normal file
4
assets/example.bytes
Normal file
|
|
@ -0,0 +1,4 @@
|
|||
load 10 A1
|
||||
load 0 A0
|
||||
add A0 1
|
||||
jump_less_than A0 A1 0
|
||||
29
c-abi.md
29
c-abi.md
|
|
@ -1,29 +0,0 @@
|
|||
# C ABI (proposal)
|
||||
|
||||
## C datatypes
|
||||
| C Type | Description | Size (B) |
|
||||
|:------------|:-------------------------|-------------:|
|
||||
| char | Character / byte | 8 |
|
||||
| short | Short integer | 16 |
|
||||
| int | Integer | 32 |
|
||||
| long | Long integer | 64 |
|
||||
| long long | Long long integer | 64 |
|
||||
| T* | Pointer | 64 |
|
||||
| float | Single-precision float | 32 |
|
||||
| double | Double-precision float | 64 |
|
||||
| long double | Extended-precision float | **Bikeshed** |
|
||||
|
||||
## Registers
|
||||
| Register | ABI Name | Description | Saver |
|
||||
|:---------|:---------|:---------------|:-------|
|
||||
| `r0` | — | Zero register | N/A |
|
||||
| `r1` | `ra` | Return address | Caller |
|
||||
| `r2` | `sp` | Stack pointer | Callee |
|
||||
| `r3` | `tp` | Thread pointer | N/A |
|
||||
|
||||
**TODO:** Parameters
|
||||
|
||||
**TODO:** Saved
|
||||
|
||||
**TODO:** Temp
|
||||
|
||||
|
|
@ -4,18 +4,10 @@ version = "0.1.0"
|
|||
edition = "2021"
|
||||
|
||||
[dependencies]
|
||||
ariadne = "0.3"
|
||||
bytemuck = "1.13"
|
||||
hashbrown = "0.14"
|
||||
hbbytecode = { path = "../hbbytecode" }
|
||||
literify = "0.1"
|
||||
lasso = "0.7"
|
||||
paste = "1.0"
|
||||
|
||||
[dependencies.lasso]
|
||||
version = "0.7"
|
||||
default-features = false
|
||||
features = ["no-std"]
|
||||
|
||||
[dependencies.logos]
|
||||
version = "0.13"
|
||||
default-features = false
|
||||
|
|
|
|||
|
|
@ -1,12 +0,0 @@
|
|||
-- Add two numbers
|
||||
-- A + B = C
|
||||
|
||||
-- r1 A
|
||||
li r1, 2
|
||||
-- r2 Result
|
||||
li r2, 0
|
||||
-- B = 4
|
||||
addi r2, r1, 4
|
||||
|
||||
-- terminate execution
|
||||
tx
|
||||
|
|
@ -1,16 +0,0 @@
|
|||
-- r1 will be the temp in fahrenheit
|
||||
-- r2 temp in celsius
|
||||
-- r3/r4/r5 will be used by constants
|
||||
|
||||
-- (f - 32) * 5 / 9
|
||||
|
||||
li r1, 100
|
||||
|
||||
li r3, 32
|
||||
li r4, 5
|
||||
li r5, 9
|
||||
|
||||
sub r2, r1, r3
|
||||
mul r2, r2, r4
|
||||
dir r2, r0, r2, r5
|
||||
tx
|
||||
|
|
@ -1,14 +0,0 @@
|
|||
li r255, 0
|
||||
ecall
|
||||
|
||||
li r255, 1
|
||||
li r254, 1
|
||||
li r253, 100
|
||||
ecall
|
||||
|
||||
li r255, 2
|
||||
li r254, 0
|
||||
li r253, 0
|
||||
ecall
|
||||
|
||||
tx
|
||||
|
|
@ -1,2 +0,0 @@
|
|||
L:
|
||||
jal r0, r0, L
|
||||
|
|
@ -1,4 +0,0 @@
|
|||
li r20, 1010
|
||||
st r20, r24, 0, 1
|
||||
addi r24, r0, 10
|
||||
tx
|
||||
|
|
@ -1,18 +0,0 @@
|
|||
jmp r0, start
|
||||
start:
|
||||
jmp r0, init_serial_port
|
||||
|
||||
-- Uses r20 to set the port
|
||||
init_serial_port:
|
||||
add r20, r30, r10
|
||||
li r20, 00
|
||||
|
||||
-- outb(PORT + 1, 0x00); // Disable all interrupts
|
||||
-- outb(PORT + 3, 0x80); // Enable DLAB (set baud rate divisor)
|
||||
-- outb(PORT + 0, 0x03); // Set divisor to 3 (lo byte) 38400 baud
|
||||
-- outb(PORT + 1, 0x00); // (hi byte)
|
||||
-- outb(PORT + 3, 0x03); // 8 bits, no parity, one stop bit
|
||||
-- outb(PORT + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
|
||||
-- outb(PORT + 4, 0x0B); // IRQs enabled, RTS/DSR set
|
||||
-- outb(PORT + 4, 0x1E); // Set in loopback mode, test the serial chip
|
||||
-- outb(PORT + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)
|
||||
349
hbasm/src/lib.rs
349
hbasm/src/lib.rs
|
|
@ -1,104 +1,269 @@
|
|||
//! Holey Bytes Assembler
|
||||
//!
|
||||
//! Some people claim:
|
||||
//! > Write programs to handle text streams, because that is a universal interface.
|
||||
//!
|
||||
//! We at AbleCorp believe that nice programatic API is nicer than piping some text
|
||||
//! into a program. It's less error-prone and faster.
|
||||
//!
|
||||
//! So this crate contains both assembleer with API for programs and a text assembler
|
||||
//! for humans to write
|
||||
|
||||
#![no_std]
|
||||
|
||||
extern crate alloc;
|
||||
|
||||
mod macros;
|
||||
|
||||
use std::collections::HashMap;
|
||||
use {
|
||||
alloc::{vec, vec::Vec},
|
||||
hashbrown::HashSet,
|
||||
lasso::{Rodeo, Spur},
|
||||
logos::{Lexer, Logos, Span},
|
||||
std::fmt::{Display, Formatter},
|
||||
};
|
||||
|
||||
/// Assembler
|
||||
///
|
||||
/// - Opcode-generic, instruction-type-specific methods are named `i_param_<type>`
|
||||
/// - You likely won't need to use them, but they are here, just in case :)
|
||||
/// - Instruction-specific methods are named `i_<instruction>`
|
||||
pub struct Assembler {
|
||||
pub buf: Vec<u8>,
|
||||
pub sub: HashSet<usize>,
|
||||
}
|
||||
macro_rules! tokendef {
|
||||
($($opcode:literal),* $(,)?) => {
|
||||
paste::paste! {
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq, Logos)]
|
||||
#[logos(extras = Rodeo)]
|
||||
#[logos(skip r"[ \t\f]+")]
|
||||
#[logos(skip r"-- .*")]
|
||||
pub enum Token {
|
||||
$(#[token($opcode, |_| hbbytecode::opcode::[<$opcode:upper>])])*
|
||||
OpCode(u8),
|
||||
|
||||
impl Default for Assembler {
|
||||
fn default() -> Self {
|
||||
Self {
|
||||
buf: vec![0; 4],
|
||||
sub: Default::default(),
|
||||
}
|
||||
}
|
||||
}
|
||||
#[regex("[0-9]+", |l| l.slice().parse().ok())]
|
||||
#[regex(
|
||||
"-[0-9]+",
|
||||
|lexer| {
|
||||
Some(u64::from_ne_bytes(lexer.slice().parse::<i64>().ok()?.to_ne_bytes()))
|
||||
},
|
||||
)] Integer(u64),
|
||||
|
||||
hbbytecode::invoke_with_def!(macros::text::gen_text);
|
||||
#[regex(
|
||||
"r[0-9]+",
|
||||
|lexer| match lexer.slice()[1..].parse() {
|
||||
Ok(n) => Some(n),
|
||||
_ => None
|
||||
},
|
||||
)] Register(u8),
|
||||
|
||||
impl Assembler {
|
||||
hbbytecode::invoke_with_def!(macros::asm::impl_asm);
|
||||
#[regex(
|
||||
r"\p{XID_Start}\p{XID_Continue}*:",
|
||||
|lexer| lexer.extras.get_or_intern(&lexer.slice()[..lexer.slice().len() - 1]),
|
||||
)] Label(Spur),
|
||||
|
||||
/// Append 12 zeroes (UN) at the end and add magic to the begining
|
||||
///
|
||||
/// # HoleyBytes lore
|
||||
///
|
||||
/// In reference HBVM implementation checks are done in
|
||||
/// a separate phase before execution.
|
||||
///
|
||||
/// This way execution will be much faster as they have to
|
||||
/// be done only once.
|
||||
///
|
||||
/// There was an issue. You cannot statically check register values and
|
||||
/// `JAL` instruction could hop at the end of program to some byte, which
|
||||
/// will be interpreted as some valid opcode and VM in attempt to decode
|
||||
/// the instruction performed out-of-bounds read which leads to undefined behaviour.
|
||||
///
|
||||
/// Several options were considered to overcome this, but inserting some data at
|
||||
/// program's end which when executed would lead to undesired behaviour, though
|
||||
/// not undefined behaviour.
|
||||
///
|
||||
/// Newly created `UN` (as UNreachable) was chosen as
|
||||
/// - It was a good idea to add some equivalent to `ud2` anyways
|
||||
/// - It was chosen to be zero
|
||||
/// - What if you somehow reached that code, it will appropriately bail :)
|
||||
/// - (yes, originally `NOP` was considered)
|
||||
///
|
||||
/// Why 12 bytes? That's the size of largest instruction parameter part.
|
||||
pub fn finalise(&mut self) {
|
||||
self.buf.extend([0; 12]);
|
||||
self.buf[0..4].copy_from_slice(&0xAB1E0B_u32.to_le_bytes());
|
||||
}
|
||||
}
|
||||
#[regex(
|
||||
r"\p{XID_Start}\p{XID_Continue}*",
|
||||
|lexer| lexer.extras.get_or_intern(lexer.slice()),
|
||||
)] Symbol(Spur),
|
||||
|
||||
/// Immediate value
|
||||
///
|
||||
/// # Implementor notice
|
||||
/// It should insert exactly 8 bytes, otherwise output will be malformed.
|
||||
/// This is not checked in any way
|
||||
pub trait Imm {
|
||||
/// Insert immediate value
|
||||
fn insert(&self, asm: &mut Assembler);
|
||||
}
|
||||
|
||||
/// Implement immediate values
|
||||
macro_rules! impl_imm_le_bytes {
|
||||
($($ty:ty),* $(,)?) => {
|
||||
$(
|
||||
impl Imm for $ty {
|
||||
#[inline(always)]
|
||||
fn insert(&self, asm: &mut Assembler) {
|
||||
// Convert to little-endian bytes, insert.
|
||||
asm.buf.extend(self.to_le_bytes());
|
||||
}
|
||||
#[token("\n")]
|
||||
#[token(";")] ISep,
|
||||
#[token(",")] PSep,
|
||||
}
|
||||
)*
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
impl_imm_le_bytes!(u64, i64, f64);
|
||||
#[rustfmt::skip]
|
||||
tokendef![
|
||||
"nop", "add", "sub", "mul", "and", "or", "xor", "sl", "sr", "srs", "cmp", "cmpu",
|
||||
"dir", "neg", "not", "addi", "muli", "andi", "ori", "xori", "sli", "sri", "srsi",
|
||||
"cmpi", "cmpui", "cp", "swa", "li", "ld", "st", "bmc", "brc", "jmp", "jeq", "jne",
|
||||
"jlt", "jgt", "jltu", "jgtu", "ecall", "addf", "mulf", "dirf", "addfi", "mulfi",
|
||||
];
|
||||
|
||||
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
|
||||
pub enum ErrorKind {
|
||||
UnexpectedToken,
|
||||
InvalidToken,
|
||||
UnexpectedEnd,
|
||||
InvalidSymbol,
|
||||
}
|
||||
|
||||
#[derive(Clone, Debug, PartialEq, Eq)]
|
||||
pub struct Error {
|
||||
pub kind: ErrorKind,
|
||||
pub span: Span,
|
||||
}
|
||||
|
||||
impl Display for Error {
|
||||
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
|
||||
write!(f, "Error {:?} at {:?}", self.kind, self.span)
|
||||
}
|
||||
}
|
||||
|
||||
impl std::error::Error for Error {}
|
||||
|
||||
macro_rules! expect_matches {
|
||||
($self:expr, $($pat:pat),* $(,)?) => {$(
|
||||
let $pat = $self.next()?
|
||||
else { return Err(ErrorKind::UnexpectedToken) };
|
||||
)*}
|
||||
}
|
||||
|
||||
pub fn assembly(code: &str, buf: &mut Vec<u8>) -> Result<(), Error> {
|
||||
struct Assembler<'a> {
|
||||
lexer: Lexer<'a, Token>,
|
||||
buf: &'a mut Vec<u8>,
|
||||
label_map: HashMap<Spur, u64>,
|
||||
to_sub_label: HashMap<usize, Spur>,
|
||||
}
|
||||
|
||||
impl<'a> Assembler<'a> {
|
||||
fn next(&mut self) -> Result<Token, ErrorKind> {
|
||||
match self.lexer.next() {
|
||||
Some(Ok(t)) => Ok(t),
|
||||
Some(Err(())) => Err(ErrorKind::InvalidToken),
|
||||
None => Err(ErrorKind::UnexpectedEnd),
|
||||
}
|
||||
}
|
||||
|
||||
fn assemble(&mut self) -> Result<(), ErrorKind> {
|
||||
use hbbytecode::opcode::*;
|
||||
loop {
|
||||
match self.lexer.next() {
|
||||
Some(Ok(Token::OpCode(op))) => {
|
||||
self.buf.push(op);
|
||||
match op {
|
||||
NOP | ECALL => Ok(()),
|
||||
DIR | DIRF => {
|
||||
expect_matches!(
|
||||
self,
|
||||
Token::Register(r0),
|
||||
Token::PSep,
|
||||
Token::Register(r1),
|
||||
Token::PSep,
|
||||
Token::Register(r2),
|
||||
Token::PSep,
|
||||
Token::Register(r3),
|
||||
);
|
||||
self.buf.extend([r0, r1, r2, r3]);
|
||||
Ok(())
|
||||
}
|
||||
ADD..=CMPU | ADDF..=MULF => {
|
||||
expect_matches!(
|
||||
self,
|
||||
Token::Register(r0),
|
||||
Token::PSep,
|
||||
Token::Register(r1),
|
||||
Token::PSep,
|
||||
Token::Register(r2),
|
||||
);
|
||||
self.buf.extend([r0, r1, r2]);
|
||||
Ok(())
|
||||
}
|
||||
BRC => {
|
||||
expect_matches!(
|
||||
self,
|
||||
Token::Register(r0),
|
||||
Token::PSep,
|
||||
Token::Register(r1),
|
||||
Token::PSep,
|
||||
Token::Integer(count),
|
||||
);
|
||||
self.buf.extend([
|
||||
r0,
|
||||
r1,
|
||||
u8::try_from(count).map_err(|_| ErrorKind::UnexpectedToken)?,
|
||||
]);
|
||||
Ok(())
|
||||
}
|
||||
NEG..=NOT | CP..=SWA => {
|
||||
expect_matches!(
|
||||
self,
|
||||
Token::Register(r0),
|
||||
Token::PSep,
|
||||
Token::Register(r1),
|
||||
);
|
||||
self.buf.extend([r0, r1]);
|
||||
Ok(())
|
||||
}
|
||||
LI | JMP => {
|
||||
expect_matches!(self, Token::Register(r0), Token::PSep);
|
||||
self.buf.push(r0);
|
||||
self.insert_imm()?;
|
||||
Ok(())
|
||||
}
|
||||
ADDI..=CMPUI | BMC | JEQ..=JGTU | ADDFI..=MULFI => {
|
||||
expect_matches!(
|
||||
self,
|
||||
Token::Register(r0),
|
||||
Token::PSep,
|
||||
Token::Register(r1),
|
||||
Token::PSep,
|
||||
);
|
||||
self.buf.extend([r0, r1]);
|
||||
self.insert_imm()?;
|
||||
Ok(())
|
||||
}
|
||||
LD..=ST => {
|
||||
expect_matches!(
|
||||
self,
|
||||
Token::Register(r0),
|
||||
Token::PSep,
|
||||
Token::Register(r1),
|
||||
Token::PSep,
|
||||
Token::Integer(offset),
|
||||
Token::PSep,
|
||||
Token::Integer(len),
|
||||
);
|
||||
self.buf.extend([r0, r1]);
|
||||
self.buf.extend(offset.to_le_bytes());
|
||||
self.buf.extend(
|
||||
u16::try_from(len)
|
||||
.map_err(|_| ErrorKind::InvalidToken)?
|
||||
.to_le_bytes(),
|
||||
);
|
||||
Ok(())
|
||||
}
|
||||
_ => unreachable!(),
|
||||
}?;
|
||||
match self.next() {
|
||||
Ok(Token::ISep) => (),
|
||||
Ok(_) => return Err(ErrorKind::UnexpectedToken),
|
||||
Err(ErrorKind::UnexpectedEnd) => return Ok(()),
|
||||
Err(e) => return Err(e),
|
||||
}
|
||||
}
|
||||
Some(Ok(Token::Label(lbl))) => {
|
||||
self.label_map.insert(lbl, self.buf.len() as u64);
|
||||
}
|
||||
Some(Ok(Token::ISep)) => (),
|
||||
Some(Ok(_)) => return Err(ErrorKind::UnexpectedToken),
|
||||
Some(Err(())) => return Err(ErrorKind::InvalidToken),
|
||||
None => return Ok(()),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn link_local_syms(&mut self) -> Result<(), ErrorKind> {
|
||||
for (ix, sym) in &self.to_sub_label {
|
||||
self.label_map
|
||||
.get(sym)
|
||||
.ok_or(ErrorKind::InvalidSymbol)?
|
||||
.to_le_bytes()
|
||||
.iter()
|
||||
.enumerate()
|
||||
.for_each(|(i, b)| {
|
||||
self.buf[ix + i] = *b;
|
||||
});
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn insert_imm(&mut self) -> Result<(), ErrorKind> {
|
||||
let imm = match self.next()? {
|
||||
Token::Integer(i) => i.to_le_bytes(),
|
||||
Token::Symbol(s) => {
|
||||
self.to_sub_label.insert(self.buf.len(), s);
|
||||
[0; 8]
|
||||
}
|
||||
_ => return Err(ErrorKind::UnexpectedToken),
|
||||
};
|
||||
self.buf.extend(imm);
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
let mut asm = Assembler {
|
||||
lexer: Token::lexer(code),
|
||||
label_map: Default::default(),
|
||||
to_sub_label: Default::default(),
|
||||
buf,
|
||||
};
|
||||
|
||||
asm.assemble().map_err(|kind| Error {
|
||||
kind,
|
||||
span: asm.lexer.span(),
|
||||
})?;
|
||||
|
||||
asm.link_local_syms()
|
||||
.map_err(|kind| Error { kind, span: 0..0 })
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,89 +0,0 @@
|
|||
//! Macros to generate [`crate::Assembler`]
|
||||
|
||||
/// Incremental token-tree muncher to implement specific instruction
|
||||
/// functions based on generic function for instruction type
|
||||
macro_rules! impl_asm_opcodes {
|
||||
( // End case
|
||||
$generic:ident
|
||||
($($param_i:ident: $param_ty:ty),*)
|
||||
=> []
|
||||
) => {};
|
||||
|
||||
(
|
||||
$generic:ident
|
||||
($($param_i:ident: $param_ty:ty),*)
|
||||
=> [$opcode:ident, $($rest:tt)*]
|
||||
) => {
|
||||
// Instruction-specific function
|
||||
paste::paste! {
|
||||
#[inline(always)]
|
||||
pub fn [<i_ $opcode:lower>](&mut self, $($param_i: $param_ty),*) {
|
||||
self.$generic(hbbytecode::opcode::$opcode, $($param_i),*)
|
||||
}
|
||||
}
|
||||
|
||||
// And recurse!
|
||||
macros::asm::impl_asm_opcodes!(
|
||||
$generic($($param_i: $param_ty),*)
|
||||
=> [$($rest)*]
|
||||
);
|
||||
};
|
||||
}
|
||||
|
||||
/// Numeric value insert
|
||||
macro_rules! impl_asm_insert {
|
||||
// Immediate - this is trait-based,
|
||||
// the insertion is delegated to its implementation
|
||||
($self:expr, $id:ident, I) => {
|
||||
Imm::insert(&$id, $self)
|
||||
};
|
||||
|
||||
// Length - cannot be more than 2048
|
||||
($self:expr, $id:ident, L) => {{
|
||||
assert!($id <= 2048);
|
||||
$self.buf.extend($id.to_le_bytes())
|
||||
}};
|
||||
|
||||
// Other numbers, just insert their bytes, little endian
|
||||
($self:expr, $id:ident, $_:ident) => {
|
||||
$self.buf.extend($id.to_le_bytes())
|
||||
};
|
||||
}
|
||||
|
||||
/// Implement assembler
|
||||
macro_rules! impl_asm {
|
||||
(
|
||||
$(
|
||||
$ityn:ident
|
||||
($($param_i:ident: $param_ty:ident),* $(,)?)
|
||||
=> [$($opcode:ident),* $(,)?],
|
||||
)*
|
||||
) => {
|
||||
paste::paste! {
|
||||
$(
|
||||
// Opcode-generic functions specific for instruction types
|
||||
pub fn [<i_param_ $ityn>](&mut self, opcode: u8, $($param_i: macros::asm::ident_map_ty!($param_ty)),*) {
|
||||
self.buf.push(opcode);
|
||||
$(macros::asm::impl_asm_insert!(self, $param_i, $param_ty);)*
|
||||
}
|
||||
|
||||
// Generate opcode-specific functions calling the opcode-generic ones
|
||||
macros::asm::impl_asm_opcodes!(
|
||||
[<i_param_ $ityn>]($($param_i: macros::asm::ident_map_ty!($param_ty)),*)
|
||||
=> [$($opcode,)*]
|
||||
);
|
||||
)*
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
/// Map operand type to Rust type
|
||||
#[rustfmt::skip]
|
||||
macro_rules! ident_map_ty {
|
||||
(R) => { u8 }; // Register is just u8
|
||||
(I) => { impl Imm }; // Immediate is anything implementing the trait
|
||||
(L) => { u16 }; // Copy count
|
||||
($id:ident) => { $id }; // Anything else → identity map
|
||||
}
|
||||
|
||||
pub(crate) use {ident_map_ty, impl_asm, impl_asm_insert, impl_asm_opcodes};
|
||||
|
|
@ -1,6 +0,0 @@
|
|||
//! And here the land of macros begin.
|
||||
//!
|
||||
//! They do not bite, really. Have you seen what Yandros is writing?
|
||||
|
||||
pub mod asm;
|
||||
pub mod text;
|
||||
|
|
@ -1,293 +0,0 @@
|
|||
//! Macros to generate text-code assembler at [`crate::text`]
|
||||
// Refering in module which generates a module to that module — is that even legal? :D
|
||||
|
||||
/// Generate text code based assembler
|
||||
macro_rules! gen_text {
|
||||
(
|
||||
$(
|
||||
$ityn:ident
|
||||
($($param_i:ident: $param_ty:ident),* $(,)?)
|
||||
=> [$($opcode:ident),* $(,)?],
|
||||
)*
|
||||
) => {
|
||||
/// # Text assembler
|
||||
/// Text assembler generated simply calls methods in the [`crate::Assembler`] type.
|
||||
///
|
||||
/// # Syntax
|
||||
/// ```text
|
||||
/// instruction op1, op2, …
|
||||
/// …
|
||||
/// ```
|
||||
/// - Opcode names are lowercase
|
||||
/// - Registers are prefixed with `r` followed by number
|
||||
/// - Operands are separated by `,`
|
||||
/// - Instructions are separated by either line feed or `;` (αυτό δεν είναι ερωτηματικό!)
|
||||
/// - Labels are defined by their names followed by colon `label:`
|
||||
/// - Labels are referenced simply by their names
|
||||
/// - Immediates are numbers, can be negative, floats are not yet supported
|
||||
pub mod text {
|
||||
use {
|
||||
crate::{
|
||||
Assembler,
|
||||
macros::text::*,
|
||||
},
|
||||
hashbrown::HashMap,
|
||||
lasso::{Key, Rodeo, Spur},
|
||||
logos::{Lexer, Logos, Span},
|
||||
};
|
||||
|
||||
paste::paste!(literify::literify! {
|
||||
/// Assembly token
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq, Logos)]
|
||||
#[logos(extras = Rodeo)]
|
||||
#[logos(skip r"[ \t\t]+")]
|
||||
#[logos(skip r"-- .*")]
|
||||
pub enum Token {
|
||||
$($(#[token(~([<$opcode:lower>]), |_| hbbytecode::opcode::[<$opcode:upper>])])*)*
|
||||
Opcode(u8),
|
||||
|
||||
#[regex("[0-9]+", |l| l.slice().parse().ok())]
|
||||
#[regex(
|
||||
"-[0-9]+",
|
||||
|lexer| {
|
||||
Some(u64::from_ne_bytes(lexer.slice().parse::<i64>().ok()?.to_ne_bytes()))
|
||||
},
|
||||
)] Integer(u64),
|
||||
|
||||
#[regex(
|
||||
"r[0-9]+",
|
||||
|lexer| match lexer.slice()[1..].parse() {
|
||||
Ok(n) => Some(n),
|
||||
_ => None
|
||||
},
|
||||
)] Register(u8),
|
||||
|
||||
#[regex(
|
||||
r"\p{XID_Start}\p{XID_Continue}*:",
|
||||
|lexer| lexer.extras.get_or_intern(&lexer.slice()[..lexer.slice().len() - 1]),
|
||||
)] Label(Spur),
|
||||
|
||||
#[regex(
|
||||
r"\p{XID_Start}\p{XID_Continue}*",
|
||||
|lexer| lexer.extras.get_or_intern(lexer.slice()),
|
||||
)] Symbol(Spur),
|
||||
|
||||
#[token("\n")]
|
||||
#[token(";")] ISep,
|
||||
#[token(",")] PSep,
|
||||
}
|
||||
});
|
||||
|
||||
/// Type of error
|
||||
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
|
||||
pub enum ErrorKind {
|
||||
UnexpectedToken,
|
||||
InvalidToken,
|
||||
UnexpectedEnd,
|
||||
InvalidSymbol,
|
||||
}
|
||||
|
||||
/// Text assembly error
|
||||
#[derive(Clone, Debug, PartialEq, Eq)]
|
||||
pub struct Error {
|
||||
pub kind: ErrorKind,
|
||||
pub span: Span,
|
||||
}
|
||||
|
||||
/// Parse code and insert instructions
|
||||
pub fn assemble(asm: &mut Assembler, code: &str) -> Result<(), Error> {
|
||||
pub struct TextAsm<'a> {
|
||||
asm: &'a mut Assembler,
|
||||
lexer: Lexer<'a, Token>,
|
||||
symloc: HashMap<Spur, usize>,
|
||||
}
|
||||
|
||||
impl<'a> TextAsm<'a> {
|
||||
fn next(&mut self) -> Result<Token, ErrorKind> {
|
||||
match self.lexer.next() {
|
||||
Some(Ok(t)) => Ok(t),
|
||||
Some(Err(())) => Err(ErrorKind::InvalidToken),
|
||||
None => Err(ErrorKind::UnexpectedEnd),
|
||||
}
|
||||
}
|
||||
|
||||
#[inline(always)]
|
||||
fn run(&mut self) -> Result<(), ErrorKind> {
|
||||
loop {
|
||||
match self.lexer.next() {
|
||||
// Got an opcode
|
||||
Some(Ok(Token::Opcode(op))) => {
|
||||
match op {
|
||||
// Special-cased
|
||||
hbbytecode::opcode::BRC => {
|
||||
param_extract_itm!(
|
||||
self,
|
||||
p0: R,
|
||||
p1: R,
|
||||
p2: u8
|
||||
);
|
||||
|
||||
self.asm.i_param_bbb(op, p0, p1, p2);
|
||||
},
|
||||
|
||||
// Take all the opcodes and match them to their corresponding functions
|
||||
$(
|
||||
#[allow(unreachable_patterns)]
|
||||
$(hbbytecode::opcode::$opcode)|* => paste::paste!({
|
||||
param_extract_itm!(self, $($param_i: $param_ty),*);
|
||||
self.asm.[<i_param_ $ityn>](op, $($param_i),*);
|
||||
}),
|
||||
)*
|
||||
|
||||
// Already matched in Logos, should not be able to obtain
|
||||
// invalid opcode.
|
||||
_ => unreachable!(),
|
||||
}
|
||||
}
|
||||
// Insert label to table
|
||||
Some(Ok(Token::Label(lbl))) => {
|
||||
self.symloc.insert(lbl, self.asm.buf.len());
|
||||
}
|
||||
// Instruction separator (LF, ;)
|
||||
Some(Ok(Token::ISep)) => (),
|
||||
Some(Ok(_)) => return Err(ErrorKind::UnexpectedToken),
|
||||
Some(Err(())) => return Err(ErrorKind::InvalidToken),
|
||||
None => return Ok(()),
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
let mut asm = TextAsm {
|
||||
asm,
|
||||
lexer: Token::lexer(code),
|
||||
symloc: HashMap::default(),
|
||||
};
|
||||
|
||||
asm.run()
|
||||
.map_err(|kind| Error { kind, span: asm.lexer.span() })?;
|
||||
|
||||
// Walk table and substitute labels
|
||||
// for their addresses
|
||||
for &loc in &asm.asm.sub {
|
||||
// Extract indices from the code and get addresses from table
|
||||
let val = asm.symloc
|
||||
.get(
|
||||
&Spur::try_from_usize(bytemuck::pod_read_unaligned::<u64>(
|
||||
&asm.asm.buf[loc..loc + core::mem::size_of::<u64>()]) as _
|
||||
).unwrap()
|
||||
)
|
||||
.ok_or(Error { kind: ErrorKind::InvalidSymbol, span: 0..0 })?
|
||||
.to_le_bytes();
|
||||
|
||||
// New address
|
||||
asm.asm.buf[loc..]
|
||||
.iter_mut()
|
||||
.zip(val)
|
||||
.for_each(|(dst, src)| *dst = src);
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
// Fun fact: this is a little hack
|
||||
// It may slow the things a little bit down, but
|
||||
// it made the macro to be made pretty nice.
|
||||
//
|
||||
// If you have any idea how to get rid of this,
|
||||
// contributions are welcome :)
|
||||
// I *likely* won't try anymore.
|
||||
enum InternalImm {
|
||||
Const(u64),
|
||||
Named(Spur),
|
||||
}
|
||||
|
||||
impl $crate::Imm for InternalImm {
|
||||
#[inline]
|
||||
fn insert(&self, asm: &mut Assembler) {
|
||||
match self {
|
||||
// Constant immediate, just put it in
|
||||
Self::Const(a) => a.insert(asm),
|
||||
// Label
|
||||
Self::Named(a) => {
|
||||
// Insert to the sub table that substitution will be
|
||||
// requested
|
||||
asm.sub.insert(asm.buf.len());
|
||||
// Insert value from interner in place
|
||||
asm.buf.extend((a.into_usize() as u64).to_le_bytes());
|
||||
},
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
/// Extract item by pattern, otherwise return [`ErrorKind::UnexpectedToken`]
|
||||
macro_rules! extract_pat {
|
||||
($self:expr, $pat:pat) => {
|
||||
let $pat = $self.next()?
|
||||
else { return Err(ErrorKind::UnexpectedToken) };
|
||||
};
|
||||
}
|
||||
|
||||
/// Generate extract macro
|
||||
macro_rules! gen_extract {
|
||||
// Integer types have same body
|
||||
($($int:ident),* $(,)?) => {
|
||||
/// Extract operand from code
|
||||
macro_rules! extract {
|
||||
// Register (require prefixing with r)
|
||||
($self:expr, R, $id:ident) => {
|
||||
extract_pat!($self, Token::Register($id));
|
||||
};
|
||||
|
||||
($self:expr, L, $id:ident) => {
|
||||
extract_pat!($self, Token::Integer($id));
|
||||
if $id > 2048 {
|
||||
return Err(ErrorKind::InvalidToken);
|
||||
}
|
||||
|
||||
let $id = u16::try_from($id).unwrap();
|
||||
};
|
||||
|
||||
// Immediate
|
||||
($self:expr, I, $id:ident) => {
|
||||
let $id = match $self.next()? {
|
||||
// Either straight up integer
|
||||
Token::Integer(a) => InternalImm::Const(a),
|
||||
// …or a label
|
||||
Token::Symbol(a) => InternalImm::Named(a),
|
||||
_ => return Err(ErrorKind::UnexpectedToken),
|
||||
};
|
||||
};
|
||||
|
||||
// Get $int, if not fitting, the token is claimed invalid
|
||||
$(($self:expr, $int, $id:ident) => {
|
||||
extract_pat!($self, Token::Integer($id));
|
||||
let $id = $int::try_from($id).map_err(|_| ErrorKind::InvalidToken)?;
|
||||
});*;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
gen_extract!(u8, u16, u32);
|
||||
|
||||
/// Parameter extract incremental token-tree muncher
|
||||
///
|
||||
/// What else would it mean?
|
||||
macro_rules! param_extract_itm {
|
||||
($self:expr, $($id:ident: $ty:ident)? $(, $($tt:tt)*)?) => {
|
||||
// Extract pattern
|
||||
$(extract!($self, $ty, $id);)?
|
||||
$(
|
||||
// Require operand separator
|
||||
extract_pat!($self, Token::PSep);
|
||||
// And go to the next (recursive)
|
||||
// …munch munch… yummy token trees.
|
||||
param_extract_itm!($self, $($tt)*);
|
||||
)?
|
||||
};
|
||||
}
|
||||
|
||||
pub(crate) use {extract, extract_pat, gen_text, param_extract_itm};
|
||||
|
|
@ -1,56 +1,21 @@
|
|||
use std::io::Write;
|
||||
|
||||
use hbasm::Assembler;
|
||||
|
||||
use {
|
||||
ariadne::{ColorGenerator, Label, Report, ReportKind, Source},
|
||||
std::{
|
||||
error::Error,
|
||||
io::{stdin, Read},
|
||||
},
|
||||
use std::{
|
||||
error::Error,
|
||||
io::{stdin, stdout, Read, Write},
|
||||
};
|
||||
|
||||
fn main() -> Result<(), Box<dyn Error>> {
|
||||
let mut code = String::new();
|
||||
stdin().read_to_string(&mut code)?;
|
||||
|
||||
let mut assembler = Assembler::default();
|
||||
if let Err(e) = hbasm::text::assemble(&mut assembler, &code) {
|
||||
let mut colors = ColorGenerator::new();
|
||||
|
||||
let e_code = match e.kind {
|
||||
hbasm::text::ErrorKind::UnexpectedToken => 1,
|
||||
hbasm::text::ErrorKind::InvalidToken => 2,
|
||||
hbasm::text::ErrorKind::UnexpectedEnd => 3,
|
||||
hbasm::text::ErrorKind::InvalidSymbol => 4,
|
||||
};
|
||||
let message = match e.kind {
|
||||
hbasm::text::ErrorKind::UnexpectedToken => "This token is not expected!",
|
||||
hbasm::text::ErrorKind::InvalidToken => "The token is not valid!",
|
||||
hbasm::text::ErrorKind::UnexpectedEnd => {
|
||||
"The assembler reached the end of input unexpectedly!"
|
||||
}
|
||||
hbasm::text::ErrorKind::InvalidSymbol => {
|
||||
"This referenced symbol doesn't have a corresponding label!"
|
||||
}
|
||||
};
|
||||
let a = colors.next();
|
||||
|
||||
Report::build(ReportKind::Error, "engine_internal", e.span.clone().start)
|
||||
.with_code(e_code)
|
||||
.with_message(format!("{:?}", e.kind))
|
||||
.with_label(
|
||||
Label::new(("engine_internal", e.span))
|
||||
.with_message(message)
|
||||
.with_color(a),
|
||||
)
|
||||
.finish()
|
||||
.eprint(("engine_internal", Source::from(&code)))
|
||||
.unwrap();
|
||||
} else {
|
||||
assembler.finalise();
|
||||
std::io::stdout().lock().write_all(&assembler.buf).unwrap();
|
||||
let mut buf = vec![];
|
||||
if let Err(e) = hbasm::assembly(&code, &mut buf) {
|
||||
eprintln!(
|
||||
"Error {:?} at {:?} (`{}`)",
|
||||
e.kind,
|
||||
e.span.clone(),
|
||||
&code[e.span],
|
||||
);
|
||||
}
|
||||
|
||||
stdout().write_all(&buf)?;
|
||||
Ok(())
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,68 +1,60 @@
|
|||
/* HoleyBytes Bytecode representation in C
|
||||
* Requires C23 compiler or better
|
||||
*
|
||||
* Uses MSVC pack pragma extension,
|
||||
* proved to work with Clang and GNU® GCC™.
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
#include <assert.h>
|
||||
#include <limits.h>
|
||||
#include <stdint.h>
|
||||
|
||||
static_assert(CHAR_BIT == 8, "Cursed architectures are not supported");
|
||||
|
||||
enum hbbc_Opcode: uint8_t {
|
||||
hbbc_Op_UN , hbbc_Op_TX , hbbc_Op_NOP , hbbc_Op_ADD , hbbc_Op_SUB , hbbc_Op_MUL ,
|
||||
hbbc_Op_AND , hbbc_Op_OR , hbbc_Op_XOR , hbbc_Op_SL , hbbc_Op_SR , hbbc_Op_SRS ,
|
||||
hbbc_Op_CMP , hbbc_Op_CMPU , hbbc_Op_DIR , hbbc_Op_NEG , hbbc_Op_NOT , hbbc_Op_ADDI ,
|
||||
hbbc_Op_MULI , hbbc_Op_ANDI , hbbc_Op_ORI , hbbc_Op_XORI , hbbc_Op_SLI , hbbc_Op_SRI ,
|
||||
hbbc_Op_SRSI , hbbc_Op_CMPI , hbbc_Op_CMPUI , hbbc_Op_CP , hbbc_Op_SWA , hbbc_Op_LI ,
|
||||
hbbc_Op_LD , hbbc_Op_ST , hbbc_Op_BMC , hbbc_Op_BRC , hbbc_Op_JMP , hbbc_Op_JAL ,
|
||||
hbbc_Op_JEQ , hbbc_Op_JNE , hbbc_Op_JLT , hbbc_Op_JGT , hbbc_Op_JLTU , hbbc_Op_JGTU ,
|
||||
hbbc_Op_ECALL , hbbc_Op_ADDF , hbbc_Op_SUBF , hbbc_Op_MULF , hbbc_Op_DIRF , hbbc_Op_FMAF ,
|
||||
hbbc_Op_NEGF , hbbc_Op_ITF , hbbc_Op_FTI , hbbc_Op_ADDFI , hbbc_Op_MULFI ,
|
||||
} typedef hbbc_Opcode;
|
||||
typedef enum hbbc_Opcode: uint8_t {
|
||||
hbbc_Op_NOP, hbbc_Op_ADD, hbbc_Op_MUL, hbbc_Op_AND, hbbc_Op_OR, hbbc_Op_XOR, hbbc_Op_SL,
|
||||
hbbc_Op_SR, hbbc_Op_SRS, hbbc_Op_CMP, hbbc_Op_CMPU, hbbc_Op_DIR, hbbc_Op_NEG, hbbc_Op_NOT,
|
||||
hbbc_Op_ADDI, hbbc_Op_MULI, hbbc_Op_ANDI, hbbc_Op_ORI, hbbc_Op_XORI, hbbc_Op_SLI, hbbc_Op_SRI,
|
||||
hbbc_Op_SRSI, hbbc_Op_CMPI, hbbc_Op_CMPUI, hbbc_Op_CP, hbbc_Op_SWA, hbbc_Op_LI, hbbc_Op_LD,
|
||||
hbbc_Op_ST, hbbc_Op_BMC, hbbc_Op_BRC, hbbc_Op_JMP, hbbc_Op_JEQ, hbbc_Op_JNE, hbbc_Op_JLT,
|
||||
hbbc_Op_JGT, hbbc_Op_JLTU, hbbc_Op_JGTU, hbbc_Op_ECALL, hbbc_Op_ADDF, hbbc_Op_MULF,
|
||||
hbbc_Op_DIRF, hbbc_Op_ADDFI, hbbc_Op_MULFI,
|
||||
} hbbc_Opcode;
|
||||
|
||||
static_assert(sizeof(hbbc_Opcode) == 1);
|
||||
|
||||
#pragma pack(push, 1)
|
||||
struct hbbc_ParamBBBB
|
||||
typedef struct hbbc_ParamBBBB
|
||||
{ uint8_t _0; uint8_t _1; uint8_t _2; uint8_t _3; }
|
||||
typedef hbbc_ParamBBBB;
|
||||
static_assert(sizeof(hbbc_ParamBBBB) == 32 / 8);
|
||||
hbbc_ParamBBBB;
|
||||
static_assert(sizeof(hbbc_ParamBBBB) == 4);
|
||||
|
||||
struct hbbc_ParamBBB
|
||||
typedef struct hbbc_ParamBBB
|
||||
{ uint8_t _0; uint8_t _1; uint8_t _2; }
|
||||
typedef hbbc_ParamBBB;
|
||||
static_assert(sizeof(hbbc_ParamBBB) == 24 / 8);
|
||||
hbbc_ParamBBB;
|
||||
static_assert(sizeof(hbbc_ParamBBB) == 3);
|
||||
|
||||
struct hbbc_ParamBBDH
|
||||
typedef struct hbbc_ParamBBDH
|
||||
{ uint8_t _0; uint8_t _1; uint64_t _2; uint16_t _3; }
|
||||
typedef hbbc_ParamBBDH;
|
||||
static_assert(sizeof(hbbc_ParamBBDH) == 96 / 8);
|
||||
hbbc_ParamBBDH;
|
||||
static_assert(sizeof(hbbc_ParamBBDH) == 12);
|
||||
|
||||
struct hbbc_ParamBBD
|
||||
typedef struct hbbc_ParamBBDB
|
||||
{ uint8_t _0; uint8_t _1; uint64_t _2; uint8_t _3; }
|
||||
hbbc_ParamBBDB;
|
||||
static_assert(sizeof(hbbc_ParamBBDB) == 11);
|
||||
|
||||
typedef struct hbbc_ParamBBD
|
||||
{ uint8_t _0; uint8_t _1; uint64_t _2; }
|
||||
typedef hbbc_ParamBBD;
|
||||
static_assert(sizeof(hbbc_ParamBBD) == 80 / 8);
|
||||
hbbc_ParamBBD;
|
||||
static_assert(sizeof(hbbc_ParamBBD) == 10);
|
||||
|
||||
struct hbbc_ParamBBW
|
||||
{ uint8_t _0; uint8_t _1; uint32_t _2; }
|
||||
typedef hbbc_ParamBBW;
|
||||
static_assert(sizeof(hbbc_ParamBBW) == 48 / 8);
|
||||
|
||||
struct hbbc_ParamBB
|
||||
typedef struct hbbc_ParamBB
|
||||
{ uint8_t _0; uint8_t _1; }
|
||||
typedef hbbc_ParamBB;
|
||||
static_assert(sizeof(hbbc_ParamBB) == 16 / 8);
|
||||
hbbc_ParamBB;
|
||||
static_assert(sizeof(hbbc_ParamBB) == 2);
|
||||
|
||||
struct hbbc_ParamBD
|
||||
typedef struct hbbc_ParamBD
|
||||
{ uint8_t _0; uint64_t _1; }
|
||||
typedef hbbc_ParamBD;
|
||||
static_assert(sizeof(hbbc_ParamBD) == 72 / 8);
|
||||
hbbc_ParamBD;
|
||||
static_assert(sizeof(hbbc_ParamBD) == 9);
|
||||
|
||||
typedef uint64_t hbbc_ParamD;
|
||||
static_assert(sizeof(hbbc_ParamD) == 64 / 8);
|
||||
static_assert(sizeof(hbbc_ParamD) == 8);
|
||||
|
||||
#pragma pack(pop)
|
||||
|
|
|
|||
|
|
@ -1,170 +0,0 @@
|
|||
//! Generate HoleyBytes code validator
|
||||
|
||||
macro_rules! gen_valider {
|
||||
(
|
||||
$(
|
||||
$ityn:ident
|
||||
($($param_i:ident: $param_ty:ident),* $(,)?)
|
||||
=> [$($opcode:ident),* $(,)?],
|
||||
)*
|
||||
) => {
|
||||
#[allow(unreachable_code)]
|
||||
pub mod valider {
|
||||
//! Validate if program is sound to execute
|
||||
|
||||
/// Program validation error kind
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub enum ErrorKind {
|
||||
/// Unknown opcode
|
||||
InvalidInstruction,
|
||||
/// VM doesn't implement this valid opcode
|
||||
Unimplemented,
|
||||
/// Attempted to copy over register boundary
|
||||
RegisterArrayOverflow,
|
||||
/// Program is not validly terminated
|
||||
InvalidEnd,
|
||||
/// Program misses magic
|
||||
MissingMagic
|
||||
}
|
||||
|
||||
/// Error
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub struct Error {
|
||||
/// Kind
|
||||
pub kind: ErrorKind,
|
||||
/// Location in bytecode
|
||||
pub index: usize,
|
||||
}
|
||||
|
||||
/// Perform bytecode validation. If it passes, the program should be
|
||||
/// sound to execute.
|
||||
pub fn validate(mut program: &[u8]) -> Result<(), Error> {
|
||||
// Validate magic
|
||||
if program.get(0..4) != Some(&0xAB1E0B_u32.to_le_bytes()) {
|
||||
return Err(Error {
|
||||
kind: ErrorKind::MissingMagic,
|
||||
index: 0,
|
||||
});
|
||||
}
|
||||
|
||||
// Program has to end with 12 zeroes, if there is less than
|
||||
// 12 bytes, program is invalid.
|
||||
if program.len() < 12 {
|
||||
return Err(Error {
|
||||
kind: ErrorKind::InvalidEnd,
|
||||
index: 0,
|
||||
});
|
||||
}
|
||||
|
||||
// Verify that program ends with 12 zeroes
|
||||
for (index, item) in program.iter().enumerate().skip(program.len() - 12) {
|
||||
if *item != 0 {
|
||||
return Err(Error {
|
||||
kind: ErrorKind::InvalidEnd,
|
||||
index,
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
let start = program;
|
||||
program = &program[4..];
|
||||
loop {
|
||||
use crate::opcode::*;
|
||||
program = match program {
|
||||
// End of program
|
||||
[] => return Ok(()),
|
||||
|
||||
// Memory load/store cannot go out-of-bounds register array
|
||||
// B B D1 D2 D3 D4 D5 D6 D7 D8 H1 H2
|
||||
[LD..=ST, reg, _, _, _, _, _, _, _, _, _, count_0, count_1, ..]
|
||||
if usize::from(*reg) * 8
|
||||
+ usize::from(u16::from_le_bytes([*count_0, *count_1]))
|
||||
> 2048 =>
|
||||
{
|
||||
return Err(Error {
|
||||
kind: ErrorKind::RegisterArrayOverflow,
|
||||
index: (program.as_ptr() as usize) - (start.as_ptr() as usize),
|
||||
});
|
||||
}
|
||||
|
||||
// Block register copy cannot go out-of-bounds register array
|
||||
[BRC, src, dst, count, ..]
|
||||
if src.checked_add(*count).is_none()
|
||||
|| dst.checked_add(*count).is_none() =>
|
||||
{
|
||||
return Err(Error {
|
||||
kind: ErrorKind::RegisterArrayOverflow,
|
||||
index: (program.as_ptr() as usize) - (start.as_ptr() as usize),
|
||||
});
|
||||
}
|
||||
|
||||
$(
|
||||
$crate::gen_valider::inst_chk!(
|
||||
rest, $ityn, $($opcode),*
|
||||
)
|
||||
)|* => rest,
|
||||
|
||||
// The plebs
|
||||
_ => {
|
||||
return Err(Error {
|
||||
kind: ErrorKind::InvalidInstruction,
|
||||
index: (program.as_ptr() as usize) - (start.as_ptr() as usize),
|
||||
})
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
/// Generate instruction check pattern
|
||||
macro_rules! inst_chk {
|
||||
// Sadly this has hardcoded instruction types,
|
||||
// as I cannot generate parts of patterns+
|
||||
|
||||
($rest:ident, bbbb, $($opcode:ident),*) => {
|
||||
// B B B B
|
||||
[$($opcode)|*, _, _, _, _, $rest @ ..]
|
||||
};
|
||||
|
||||
($rest:ident, bbb, $($opcode:ident),*) => {
|
||||
// B B B
|
||||
[$($opcode)|*, _, _, _, $rest @ ..]
|
||||
};
|
||||
|
||||
($rest:ident, bbdh, $($opcode:ident),*) => {
|
||||
// B B D1 D2 D3 D4 D5 D6 D7 D8 H1 H2
|
||||
[$($opcode)|*, _, _, _, _, _, _, _, _, _, _, _, _, $rest @ ..]
|
||||
};
|
||||
|
||||
($rest:ident, bbd, $($opcode:ident),*) => {
|
||||
// B B D1 D2 D3 D4 D5 D6 D7 D8
|
||||
[$($opcode)|*, _, _, _, _, _, _, _, _, _, _, $rest @ ..]
|
||||
};
|
||||
|
||||
($rest:ident, bbw, $($opcode:ident),*) => {
|
||||
// B B W1 W2 W3 W4
|
||||
[$($opcode)|*, _, _, _, _, _, _, $rest @ ..]
|
||||
};
|
||||
|
||||
($rest:ident, bb, $($opcode:ident),*) => {
|
||||
// B B
|
||||
[$($opcode)|*, _, _, $rest @ ..]
|
||||
};
|
||||
|
||||
($rest:ident, bd, $($opcode:ident),*) => {
|
||||
// B D1 D2 D3 D4 D5 D6 D7 D8
|
||||
[$($opcode)|*, _, _, _, _, _, _, _, _, _, $rest @ ..]
|
||||
};
|
||||
|
||||
($rest:ident, n, $($opcode:ident),*) => {
|
||||
[$($opcode)|*, $rest @ ..]
|
||||
};
|
||||
|
||||
($_0:ident, $($_1:ident),*) => {
|
||||
compile_error!("Invalid instruction type");
|
||||
}
|
||||
}
|
||||
|
||||
pub(crate) use {gen_valider, inst_chk};
|
||||
|
|
@ -1,7 +1,5 @@
|
|||
#![no_std]
|
||||
|
||||
mod gen_valider;
|
||||
|
||||
macro_rules! constmod {
|
||||
($vis:vis $mname:ident($repr:ty) {
|
||||
$(#![doc = $mdoc:literal])?
|
||||
|
|
@ -17,147 +15,92 @@ macro_rules! constmod {
|
|||
};
|
||||
}
|
||||
|
||||
#[allow(rustdoc::invalid_rust_codeblocks)]
|
||||
/// Invoke macro with bytecode definition
|
||||
/// # Input syntax
|
||||
/// ```no_run
|
||||
/// macro!(
|
||||
/// INSTRUCTION_TYPE(p0: TYPE, p1: TYPE, …)
|
||||
/// => [INSTRUCTION_A, INSTRUCTION_B, …],
|
||||
/// …
|
||||
/// );
|
||||
/// ```
|
||||
/// - Instruction type determines opcode-generic, instruction-type-specific
|
||||
/// function. Name: `i_param_INSTRUCTION_TYPE`
|
||||
/// - Per-instructions there will be generated opcode-specific functions calling the generic ones
|
||||
/// - Operand types
|
||||
/// - R: Register (u8)
|
||||
/// - I: Immediate
|
||||
/// - L: Memory load / store size (u16)
|
||||
/// - Other types are identity-mapped
|
||||
///
|
||||
/// # BRC special-case
|
||||
/// BRC's 3rd operand is plain byte, not a register. Encoding is the same, but for some cases it may matter.
|
||||
///
|
||||
/// Please, if you distinguish in your API between byte and register, special case this one.
|
||||
///
|
||||
/// Sorry for that :(
|
||||
#[macro_export]
|
||||
macro_rules! invoke_with_def {
|
||||
($macro:path) => {
|
||||
$macro!(
|
||||
bbbb(p0: R, p1: R, p2: R, p3: R)
|
||||
=> [DIR, DIRF, FMAF],
|
||||
bbb(p0: R, p1: R, p2: R)
|
||||
=> [ADD, SUB, MUL, AND, OR, XOR, SL, SR, SRS, CMP, CMPU, BRC, ADDF, SUBF, MULF],
|
||||
bbdh(p0: R, p1: R, p2: I, p3: L)
|
||||
=> [LD, ST],
|
||||
bbd(p0: R, p1: R, p2: I)
|
||||
=> [ADDI, MULI, ANDI, ORI, XORI, CMPI, CMPUI, BMC, JAL, JEQ, JNE, JLT, JGT, JLTU,
|
||||
JGTU, ADDFI, MULFI],
|
||||
bbw(p0: R, p1: R, p2: u32)
|
||||
=> [SLI, SRI, SRSI],
|
||||
bb(p0: R, p1: R)
|
||||
=> [NEG, NOT, CP, SWA, NEGF, ITF, FTI],
|
||||
bd(p0: R, p1: I)
|
||||
=> [LI],
|
||||
n()
|
||||
=> [UN, TX, NOP, ECALL],
|
||||
);
|
||||
};
|
||||
}
|
||||
|
||||
invoke_with_def!(gen_valider::gen_valider);
|
||||
|
||||
constmod!(pub opcode(u8) {
|
||||
//! Opcode constant module
|
||||
|
||||
UN = 0, "N; Raises a trap";
|
||||
TX = 1, "N; Terminate execution";
|
||||
NOP = 2, "N; Do nothing";
|
||||
NOP = 0, "N; Do nothing";
|
||||
|
||||
ADD = 3, "BBB; #0 ← #1 + #2";
|
||||
SUB = 4, "BBB; #0 ← #1 - #2";
|
||||
MUL = 5, "BBB; #0 ← #1 × #2";
|
||||
AND = 6, "BBB; #0 ← #1 & #2";
|
||||
OR = 7, "BBB; #0 ← #1 | #2";
|
||||
XOR = 8, "BBB; #0 ← #1 ^ #2";
|
||||
SL = 9, "BBB; #0 ← #1 « #2";
|
||||
SR = 10, "BBB; #0 ← #1 » #2";
|
||||
SRS = 11, "BBB; #0 ← #1 » #2 (signed)";
|
||||
CMP = 12, "BBB; #0 ← #1 <=> #2";
|
||||
CMPU = 13, "BBB; #0 ← #1 <=> #2 (unsigned)";
|
||||
DIR = 14, "BBBB; #0 ← #2 / #3, #1 ← #2 % #3";
|
||||
NEG = 15, "BB; #0 ← -#1";
|
||||
NOT = 16, "BB; #0 ← !#1";
|
||||
ADD = 1, "BBB; #0 ← #1 + #2";
|
||||
SUB = 2, "BBB; #0 ← #1 - #2";
|
||||
MUL = 3, "BBB; #0 ← #1 × #2";
|
||||
AND = 4, "BBB; #0 ← #1 & #2";
|
||||
OR = 5, "BBB; #0 ← #1 | #2";
|
||||
XOR = 6, "BBB; #0 ← #1 ^ #2";
|
||||
SL = 7, "BBB; #0 ← #1 « #2";
|
||||
SR = 8, "BBB; #0 ← #1 » #2";
|
||||
SRS = 9, "BBB; #0 ← #1 » #2 (signed)";
|
||||
CMP = 10, "BBB; #0 ← #1 <=> #2";
|
||||
CMPU = 11, "BBB; #0 ← #1 <=> #2 (unsigned)";
|
||||
DIR = 12, "BBBB; #0 ← #2 / #3, #1 ← #2 % #3";
|
||||
NEG = 13, "BB; #0 ← ~#1";
|
||||
NOT = 14, "BB; #0 ← !#1";
|
||||
|
||||
ADDI = 17, "BBD; #0 ← #1 + imm #2";
|
||||
MULI = 18, "BBD; #0 ← #1 × imm #2";
|
||||
ANDI = 19, "BBD; #0 ← #1 & imm #2";
|
||||
ORI = 20, "BBD; #0 ← #1 | imm #2";
|
||||
XORI = 21, "BBD; #0 ← #1 ^ imm #2";
|
||||
SLI = 22, "BBW; #0 ← #1 « imm #2";
|
||||
SRI = 23, "BBW; #0 ← #1 » imm #2";
|
||||
SRSI = 24, "BBW; #0 ← #1 » imm #2 (signed)";
|
||||
CMPI = 25, "BBD; #0 ← #1 <=> imm #2";
|
||||
CMPUI = 26, "BBD; #0 ← #1 <=> imm #2 (unsigned)";
|
||||
ADDI = 15, "BBD; #0 ← #1 + imm #2";
|
||||
MULI = 16, "BBD; #0 ← #1 × imm #2";
|
||||
ANDI = 17, "BBD; #0 ← #1 & imm #2";
|
||||
ORI = 18, "BBD; #0 ← #1 | imm #2";
|
||||
XORI = 19, "BBD; #0 ← #1 ^ imm #2";
|
||||
SLI = 20, "BBD; #0 ← #1 « imm #2";
|
||||
SRI = 21, "BBD; #0 ← #1 » imm #2";
|
||||
SRSI = 22, "BBD; #0 ← #1 » imm #2 (signed)";
|
||||
CMPI = 23, "BBD; #0 ← #1 <=> imm #2";
|
||||
CMPUI = 24, "BBD; #0 ← #1 <=> imm #2 (unsigned)";
|
||||
|
||||
CP = 27, "BB; Copy #0 ← #1";
|
||||
SWA = 28, "BB; Swap #0 and #1";
|
||||
LI = 29, "BD; #0 ← imm #1";
|
||||
LD = 30, "BBDB; #0 ← [#1 + imm #3], imm #4 bytes, overflowing";
|
||||
ST = 31, "BBDB; [#1 + imm #3] ← #0, imm #4 bytes, overflowing";
|
||||
BMC = 32, "BBD; [#0] ← [#1], imm #2 bytes";
|
||||
BRC = 33, "BBB; #0 ← #1, imm #2 registers";
|
||||
CP = 25, "BB; Copy #0 ← #1";
|
||||
SWA = 26, "BB; Swap #0 and #1";
|
||||
LI = 27, "BD; #0 ← imm #1";
|
||||
LD = 28, "BBDB; #0 ← [#1 + imm #3], imm #4 bytes, overflowing";
|
||||
ST = 29, "BBDB; [#1 + imm #3] ← #0, imm #4 bytes, overflowing";
|
||||
BMC = 30, "BBD; [#0] ← [#1], imm #2 bytes";
|
||||
BRC = 31, "BBB; #0 ← #1, imm #2 registers";
|
||||
|
||||
JMP = 34, "D; Unconditional, non-linking absolute jump";
|
||||
JAL = 35, "BD; Copy PC to #0 and unconditional jump [#1 + imm #2]";
|
||||
JEQ = 36, "BBD; if #0 = #1 → jump imm #2";
|
||||
JNE = 37, "BBD; if #0 ≠ #1 → jump imm #2";
|
||||
JLT = 38, "BBD; if #0 < #1 → jump imm #2";
|
||||
JGT = 39, "BBD; if #0 > #1 → jump imm #2";
|
||||
JLTU = 40, "BBD; if #0 < #1 → jump imm #2 (unsigned)";
|
||||
JGTU = 41, "BBD; if #0 > #1 → jump imm #2 (unsigned)";
|
||||
ECALL = 42, "N; Issue system call";
|
||||
JMP = 32, "BD; Unconditional jump [#0 + imm #1]";
|
||||
JEQ = 33, "BBD; if #0 = #1 → jump imm #2";
|
||||
JNE = 34, "BBD; if #0 ≠ #1 → jump imm #2";
|
||||
JLT = 35, "BBD; if #0 < #1 → jump imm #2";
|
||||
JGT = 36, "BBD; if #0 > #1 → jump imm #2";
|
||||
JLTU = 37, "BBD; if #0 < #1 → jump imm #2 (unsigned)";
|
||||
JGTU = 38, "BBD; if #0 > #1 → jump imm #2 (unsigned)";
|
||||
ECALL = 39, "N; Issue system call";
|
||||
|
||||
ADDF = 43, "BBB; #0 ← #1 +. #2";
|
||||
SUBF = 44, "BBB; #0 ← #1 -. #2";
|
||||
MULF = 45, "BBB; #0 ← #1 +. #2";
|
||||
DIRF = 46, "BBBB; #0 ← #2 / #3, #1 ← #2 % #3";
|
||||
FMAF = 47, "BBBB; #0 ← (#1 * #2) + #3";
|
||||
NEGF = 48, "BB; #0 ← -#1";
|
||||
ITF = 49, "BB; #0 ← #1 as float";
|
||||
FTI = 50, "BB; #0 ← #1 as int";
|
||||
ADDF = 40, "BBB; #0 ← #1 +. #2";
|
||||
MULF = 41, "BBB; #0 ← #1 +. #2";
|
||||
DIRF = 42, "BBBB; #0 ← #2 / #3, #1 ← #2 % #3";
|
||||
|
||||
ADDFI = 51, "BBD; #0 ← #1 +. imm #2";
|
||||
MULFI = 52, "BBD; #0 ← #1 *. imm #2";
|
||||
ADDFI = 43, "BBD; #0 ← #1 +. imm #2";
|
||||
MULFI = 44, "BBD; #0 ← #1 *. imm #2";
|
||||
});
|
||||
|
||||
#[repr(packed)]
|
||||
pub struct ParamBBBB(pub u8, pub u8, pub u8, pub u8);
|
||||
|
||||
#[repr(packed)]
|
||||
pub struct ParamBBB(pub u8, pub u8, pub u8);
|
||||
|
||||
#[repr(packed)]
|
||||
pub struct ParamBBDH(pub u8, pub u8, pub u64, pub u16);
|
||||
|
||||
#[repr(packed)]
|
||||
pub struct ParamBBDB(pub u8, pub u8, pub u64, pub u8);
|
||||
|
||||
#[repr(packed)]
|
||||
pub struct ParamBBD(pub u8, pub u8, pub u64);
|
||||
#[repr(packed)]
|
||||
pub struct ParamBBW(pub u8, pub u8, pub u32);
|
||||
|
||||
#[repr(packed)]
|
||||
pub struct ParamBB(pub u8, pub u8);
|
||||
|
||||
#[repr(packed)]
|
||||
pub struct ParamBD(pub u8, pub u64);
|
||||
|
||||
/// # Safety
|
||||
/// Has to be valid to be decoded from bytecode.
|
||||
pub unsafe trait ProgramVal {}
|
||||
unsafe impl ProgramVal for ParamBBBB {}
|
||||
unsafe impl ProgramVal for ParamBBB {}
|
||||
unsafe impl ProgramVal for ParamBBDH {}
|
||||
unsafe impl ProgramVal for ParamBBD {}
|
||||
unsafe impl ProgramVal for ParamBBW {}
|
||||
unsafe impl ProgramVal for ParamBB {}
|
||||
unsafe impl ProgramVal for ParamBD {}
|
||||
unsafe impl ProgramVal for u64 {}
|
||||
unsafe impl ProgramVal for u8 {} // Opcode
|
||||
unsafe impl ProgramVal for () {}
|
||||
pub unsafe trait OpParam {}
|
||||
unsafe impl OpParam for ParamBBBB {}
|
||||
unsafe impl OpParam for ParamBBB {}
|
||||
unsafe impl OpParam for ParamBBDB {}
|
||||
unsafe impl OpParam for ParamBBDH {}
|
||||
unsafe impl OpParam for ParamBBD {}
|
||||
unsafe impl OpParam for ParamBB {}
|
||||
unsafe impl OpParam for ParamBD {}
|
||||
unsafe impl OpParam for u64 {}
|
||||
unsafe impl OpParam for () {}
|
||||
|
|
|
|||
|
|
@ -6,10 +6,10 @@ edition = "2021"
|
|||
[profile.release]
|
||||
lto = true
|
||||
|
||||
[features]
|
||||
default = ["alloc"]
|
||||
alloc = []
|
||||
nightly = []
|
||||
|
||||
[dependencies]
|
||||
hbbytecode.path = "../hbbytecode"
|
||||
delegate = "0.9"
|
||||
hashbrown = "0.13"
|
||||
hbbytecode.path = "../hbbytecode"
|
||||
log = "0.4"
|
||||
paste = "1.0"
|
||||
static_assertions = "1.0"
|
||||
|
|
|
|||
Binary file not shown.
Binary file not shown.
Binary file not shown.
Binary file not shown.
Binary file not shown.
5
hbvm/fuzz/.gitignore
vendored
5
hbvm/fuzz/.gitignore
vendored
|
|
@ -1,5 +0,0 @@
|
|||
target
|
||||
artifacts
|
||||
corpus
|
||||
coverage
|
||||
Cargo.lock
|
||||
|
|
@ -1,30 +0,0 @@
|
|||
[package]
|
||||
name = "hbvm-fuzz"
|
||||
version = "0.0.0"
|
||||
publish = false
|
||||
edition = "2021"
|
||||
|
||||
[package.metadata]
|
||||
cargo-fuzz = true
|
||||
|
||||
[dependencies]
|
||||
libfuzzer-sys = "0.4"
|
||||
|
||||
[dependencies.hbvm]
|
||||
path = ".."
|
||||
|
||||
[dependencies.hbbytecode]
|
||||
path = "../../hbbytecode"
|
||||
|
||||
# Prevent this from interfering with workspaces
|
||||
[workspace]
|
||||
members = ["."]
|
||||
|
||||
[profile.release]
|
||||
debug = 1
|
||||
|
||||
[[bin]]
|
||||
name = "vm"
|
||||
path = "fuzz_targets/vm.rs"
|
||||
test = false
|
||||
doc = false
|
||||
|
|
@ -1,85 +0,0 @@
|
|||
#![no_main]
|
||||
|
||||
use {
|
||||
hbbytecode::valider::validate,
|
||||
hbvm::{
|
||||
mem::{
|
||||
softpaging::{
|
||||
paging::{PageTable, Permission},
|
||||
HandlePageFault, PageSize, SoftPagedMem,
|
||||
},
|
||||
Address, MemoryAccessReason,
|
||||
},
|
||||
Vm,
|
||||
},
|
||||
libfuzzer_sys::fuzz_target,
|
||||
};
|
||||
|
||||
fuzz_target!(|data: &[u8]| {
|
||||
if validate(data).is_ok() {
|
||||
let mut vm = unsafe {
|
||||
Vm::<_, 16384>::new(
|
||||
SoftPagedMem::<_, true> {
|
||||
pf_handler: TestTrapHandler,
|
||||
program: data,
|
||||
root_pt: Box::into_raw(Default::default()),
|
||||
icache: Default::default(),
|
||||
},
|
||||
Address::new(4),
|
||||
)
|
||||
};
|
||||
|
||||
// Alloc and map some memory
|
||||
let pages = [
|
||||
alloc_and_map(&mut vm.memory, 0),
|
||||
alloc_and_map(&mut vm.memory, 4096),
|
||||
];
|
||||
|
||||
// Run VM
|
||||
let _ = vm.run();
|
||||
|
||||
// Unmap and dealloc the memory
|
||||
for (i, page) in pages.into_iter().enumerate() {
|
||||
unmap_and_dealloc(&mut vm.memory, page, i as u64 * 4096);
|
||||
}
|
||||
|
||||
let _ = unsafe { Box::from_raw(vm.memory.root_pt) };
|
||||
}
|
||||
});
|
||||
|
||||
fn alloc_and_map(memory: &mut SoftPagedMem<TestTrapHandler>, at: u64) -> *mut u8 {
|
||||
let ptr = Box::into_raw(Box::<Page>::default()).cast();
|
||||
unsafe {
|
||||
memory
|
||||
.map(ptr, Address::new(at), Permission::Write, PageSize::Size4K)
|
||||
.unwrap()
|
||||
};
|
||||
ptr
|
||||
}
|
||||
|
||||
fn unmap_and_dealloc(memory: &mut SoftPagedMem<TestTrapHandler>, ptr: *mut u8, from: u64) {
|
||||
memory.unmap(Address::new(from)).unwrap();
|
||||
let _ = unsafe { Box::from_raw(ptr.cast::<Page>()) };
|
||||
}
|
||||
|
||||
#[repr(align(4096))]
|
||||
struct Page([u8; 4096]);
|
||||
impl Default for Page {
|
||||
fn default() -> Self {
|
||||
unsafe { std::mem::MaybeUninit::zeroed().assume_init() }
|
||||
}
|
||||
}
|
||||
|
||||
struct TestTrapHandler;
|
||||
impl HandlePageFault for TestTrapHandler {
|
||||
fn page_fault(
|
||||
&mut self,
|
||||
_: MemoryAccessReason,
|
||||
_: &mut PageTable,
|
||||
_: Address,
|
||||
_: PageSize,
|
||||
_: *mut u8,
|
||||
) -> bool {
|
||||
false
|
||||
}
|
||||
}
|
||||
135
hbvm/src/bmc.rs
135
hbvm/src/bmc.rs
|
|
@ -1,135 +0,0 @@
|
|||
//! Block memory copier state machine
|
||||
|
||||
use {
|
||||
super::{mem::MemoryAccessReason, Memory, VmRunError},
|
||||
crate::mem::Address,
|
||||
core::{mem::MaybeUninit, task::Poll},
|
||||
};
|
||||
|
||||
/// Buffer size (defaults to 4 KiB, a smallest page size on most platforms)
|
||||
const BUF_SIZE: usize = 4096;
|
||||
|
||||
/// Buffer of possibly uninitialised bytes, aligned to [`BUF_SIZE`]
|
||||
#[repr(align(4096))]
|
||||
struct AlignedBuf([MaybeUninit<u8>; BUF_SIZE]);
|
||||
|
||||
/// State for block memory copy
|
||||
pub struct BlockCopier {
|
||||
/// Source address
|
||||
src: Address,
|
||||
/// Destination address
|
||||
dst: Address,
|
||||
/// How many buffer sizes to copy?
|
||||
n_buffers: usize,
|
||||
/// …and what remainds after?
|
||||
rem: usize,
|
||||
}
|
||||
|
||||
impl BlockCopier {
|
||||
/// Construct a new one
|
||||
#[inline]
|
||||
pub fn new(src: Address, dst: Address, count: usize) -> Self {
|
||||
Self {
|
||||
src,
|
||||
dst,
|
||||
n_buffers: count / BUF_SIZE,
|
||||
rem: count % BUF_SIZE,
|
||||
}
|
||||
}
|
||||
|
||||
/// Copy one block
|
||||
///
|
||||
/// # Safety
|
||||
/// - Same as for [`Memory::load`] and [`Memory::store`]
|
||||
pub unsafe fn poll(&mut self, memory: &mut impl Memory) -> Poll<Result<(), BlkCopyError>> {
|
||||
// Safety: Assuming uninit of array of MaybeUninit is sound
|
||||
let mut buf = AlignedBuf(MaybeUninit::uninit().assume_init());
|
||||
|
||||
// We have at least one buffer size to copy
|
||||
if self.n_buffers != 0 {
|
||||
if let Err(e) = act(
|
||||
memory,
|
||||
self.src,
|
||||
self.dst,
|
||||
buf.0.as_mut_ptr().cast(),
|
||||
BUF_SIZE,
|
||||
) {
|
||||
return Poll::Ready(Err(e));
|
||||
}
|
||||
|
||||
// Bump source and destination address
|
||||
self.src += BUF_SIZE;
|
||||
self.dst += BUF_SIZE;
|
||||
|
||||
self.n_buffers -= 1;
|
||||
|
||||
return if self.n_buffers + self.rem == 0 {
|
||||
// If there is nothing left, we are done
|
||||
Poll::Ready(Ok(()))
|
||||
} else {
|
||||
// Otherwise let's advice to run it again
|
||||
Poll::Pending
|
||||
};
|
||||
}
|
||||
|
||||
if self.rem != 0 {
|
||||
if let Err(e) = act(
|
||||
memory,
|
||||
self.src,
|
||||
self.dst,
|
||||
buf.0.as_mut_ptr().cast(),
|
||||
self.rem,
|
||||
) {
|
||||
return Poll::Ready(Err(e));
|
||||
}
|
||||
}
|
||||
|
||||
Poll::Ready(Ok(()))
|
||||
}
|
||||
}
|
||||
|
||||
/// Load to buffer and store from buffer
|
||||
#[inline]
|
||||
unsafe fn act(
|
||||
memory: &mut impl Memory,
|
||||
src: Address,
|
||||
dst: Address,
|
||||
buf: *mut u8,
|
||||
count: usize,
|
||||
) -> Result<(), BlkCopyError> {
|
||||
// Load to buffer
|
||||
memory
|
||||
.load(src, buf, count)
|
||||
.map_err(|super::mem::LoadError(addr)| BlkCopyError {
|
||||
access_reason: MemoryAccessReason::Load,
|
||||
addr,
|
||||
})?;
|
||||
|
||||
// Store from buffer
|
||||
memory
|
||||
.store(dst, buf, count)
|
||||
.map_err(|super::mem::StoreError(addr)| BlkCopyError {
|
||||
access_reason: MemoryAccessReason::Store,
|
||||
addr,
|
||||
})?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Error occured when copying a block of memory
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub struct BlkCopyError {
|
||||
/// Kind of access
|
||||
access_reason: MemoryAccessReason,
|
||||
/// VM Address
|
||||
addr: Address,
|
||||
}
|
||||
|
||||
impl From<BlkCopyError> for VmRunError {
|
||||
fn from(value: BlkCopyError) -> Self {
|
||||
match value.access_reason {
|
||||
MemoryAccessReason::Load => Self::LoadAccessEx(value.addr),
|
||||
MemoryAccessReason::Store => Self::StoreAccessEx(value.addr),
|
||||
}
|
||||
}
|
||||
}
|
||||
116
hbvm/src/lib.rs
116
hbvm/src/lib.rs
|
|
@ -1,108 +1,22 @@
|
|||
//! HoleyBytes Virtual Machine
|
||||
//!
|
||||
//! # Alloc feature
|
||||
//! - Enabled by default
|
||||
//! - Provides mapping / unmapping, as well as [`Default`] and [`Drop`]
|
||||
//! implementations for soft-paged memory implementation
|
||||
|
||||
// # General safety notice:
|
||||
// - Validation has to assure there is 256 registers (r0 - r255)
|
||||
// - Instructions have to be valid as specified (values and sizes)
|
||||
// - Mapped pages should be at least 4 KiB
|
||||
|
||||
#![no_std]
|
||||
#![cfg_attr(feature = "nightly", feature(fn_align))]
|
||||
#![warn(missing_docs)]
|
||||
|
||||
use mem::{Memory, Address};
|
||||
|
||||
#[cfg(feature = "alloc")]
|
||||
extern crate alloc;
|
||||
|
||||
pub mod mem;
|
||||
pub mod value;
|
||||
pub mod validate;
|
||||
pub mod vm;
|
||||
|
||||
mod bmc;
|
||||
mod vmrun;
|
||||
mod utils;
|
||||
|
||||
use {bmc::BlockCopier, value::Value};
|
||||
|
||||
/// HoleyBytes Virtual Machine
|
||||
pub struct Vm<Mem, const TIMER_QUOTIENT: usize> {
|
||||
/// Holds 256 registers
|
||||
///
|
||||
/// Writing to register 0 is considered undefined behaviour
|
||||
/// in terms of HoleyBytes program execution
|
||||
pub registers: [Value; 256],
|
||||
|
||||
/// Memory implementation
|
||||
pub memory: Mem,
|
||||
|
||||
/// Program counter
|
||||
pub pc: Address,
|
||||
|
||||
/// Program timer
|
||||
timer: usize,
|
||||
|
||||
/// Saved block copier
|
||||
copier: Option<BlockCopier>,
|
||||
#[derive(Debug, PartialEq)]
|
||||
pub enum RuntimeErrors {
|
||||
InvalidOpcodePair(u8, u8),
|
||||
RegisterTooSmall,
|
||||
HostError(u64),
|
||||
PageNotMapped(u64),
|
||||
InvalidJumpAddress(u64),
|
||||
InvalidSystemCall(u8),
|
||||
}
|
||||
|
||||
impl<Mem, const TIMER_QUOTIENT: usize> Vm<Mem, TIMER_QUOTIENT>
|
||||
where
|
||||
Mem: Memory,
|
||||
{
|
||||
/// Create a new VM with program and trap handler
|
||||
///
|
||||
/// # Safety
|
||||
/// Program code has to be validated
|
||||
pub unsafe fn new(memory: Mem, entry: Address) -> Self {
|
||||
Self {
|
||||
registers: [Value::from(0_u64); 256],
|
||||
memory,
|
||||
pc: entry,
|
||||
timer: 0,
|
||||
copier: None,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Virtual machine halt error
|
||||
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
|
||||
#[repr(u8)]
|
||||
pub enum VmRunError {
|
||||
/// Tried to execute invalid instruction
|
||||
InvalidOpcode(u8),
|
||||
|
||||
/// Unhandled load access exception
|
||||
LoadAccessEx(Address),
|
||||
|
||||
/// Unhandled instruction load access exception
|
||||
ProgramFetchLoadEx(Address),
|
||||
|
||||
/// Unhandled store access exception
|
||||
StoreAccessEx(Address),
|
||||
|
||||
/// Register out-of-bounds access
|
||||
RegOutOfBounds,
|
||||
|
||||
/// Address out-of-bounds
|
||||
AddrOutOfBounds,
|
||||
|
||||
/// Reached unreachable code
|
||||
Unreachable,
|
||||
}
|
||||
|
||||
/// Virtual machine halt ok
|
||||
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
|
||||
pub enum VmRunOk {
|
||||
/// Program has eached its end
|
||||
End,
|
||||
|
||||
/// Program was interrupted by a timer
|
||||
Timer,
|
||||
|
||||
/// Environment call
|
||||
Ecall,
|
||||
// If you solve the halting problem feel free to remove this
|
||||
#[derive(PartialEq, Debug)]
|
||||
pub enum HaltStatus {
|
||||
Halted,
|
||||
Running,
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,14 +1,5 @@
|
|||
use hbvm::mem::Address;
|
||||
|
||||
use {
|
||||
hbbytecode::valider::validate,
|
||||
hbvm::{
|
||||
mem::{
|
||||
softpaging::{paging::PageTable, HandlePageFault, PageSize, SoftPagedMem},
|
||||
MemoryAccessReason,
|
||||
},
|
||||
Vm,
|
||||
},
|
||||
hbvm::{validate::validate, vm::Vm},
|
||||
std::io::{stdin, Read},
|
||||
};
|
||||
|
||||
|
|
@ -21,43 +12,10 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
|
|||
return Ok(());
|
||||
} else {
|
||||
unsafe {
|
||||
let mut vm = Vm::<_, 0>::new(
|
||||
SoftPagedMem::<_, true> {
|
||||
pf_handler: TestTrapHandler,
|
||||
program: &prog,
|
||||
root_pt: Box::into_raw(Default::default()),
|
||||
icache: Default::default(),
|
||||
},
|
||||
Address::new(4),
|
||||
);
|
||||
let data = {
|
||||
let ptr = std::alloc::alloc_zeroed(std::alloc::Layout::from_size_align_unchecked(
|
||||
4096, 4096,
|
||||
));
|
||||
if ptr.is_null() {
|
||||
panic!("Alloc error tbhl");
|
||||
}
|
||||
ptr
|
||||
};
|
||||
|
||||
vm.memory
|
||||
.map(
|
||||
data,
|
||||
Address::new(8192),
|
||||
hbvm::mem::softpaging::paging::Permission::Write,
|
||||
PageSize::Size4K,
|
||||
)
|
||||
.unwrap();
|
||||
|
||||
let mut vm = Vm::new_unchecked(&prog);
|
||||
vm.memory.insert_test_page();
|
||||
println!("Program interrupt: {:?}", vm.run());
|
||||
println!("{:?}", vm.registers);
|
||||
|
||||
std::alloc::dealloc(
|
||||
data,
|
||||
std::alloc::Layout::from_size_align_unchecked(4096, 4096),
|
||||
);
|
||||
vm.memory.unmap(Address::new(8192)).unwrap();
|
||||
let _ = Box::from_raw(vm.memory.root_pt);
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
|
|
@ -66,18 +24,3 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
|
|||
pub fn time() -> u32 {
|
||||
9
|
||||
}
|
||||
|
||||
#[derive(Default)]
|
||||
struct TestTrapHandler;
|
||||
impl HandlePageFault for TestTrapHandler {
|
||||
fn page_fault(
|
||||
&mut self,
|
||||
_: MemoryAccessReason,
|
||||
_: &mut PageTable,
|
||||
_: Address,
|
||||
_: PageSize,
|
||||
_: *mut u8,
|
||||
) -> bool {
|
||||
false
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,110 +0,0 @@
|
|||
//! Virtual(?) memory address
|
||||
|
||||
use core::{fmt::Debug, ops};
|
||||
|
||||
use crate::utils::impl_display;
|
||||
|
||||
/// Memory address
|
||||
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
|
||||
pub struct Address(u64);
|
||||
impl Address {
|
||||
/// A null address
|
||||
pub const NULL: Self = Self(0);
|
||||
|
||||
/// Saturating integer addition. Computes self + rhs, saturating at the numeric bounds instead of overflowing.
|
||||
#[inline]
|
||||
pub fn saturating_add<T: AddressOp>(self, rhs: T) -> Self {
|
||||
Self(self.0.saturating_add(rhs.cast_u64()))
|
||||
}
|
||||
|
||||
/// Saturating integer subtraction. Computes self - rhs, saturating at the numeric bounds instead of overflowing.
|
||||
#[inline]
|
||||
pub fn saturating_sub<T: AddressOp>(self, rhs: T) -> Self {
|
||||
Self(self.0.saturating_sub(rhs.cast_u64()))
|
||||
}
|
||||
|
||||
/// Cast or if smaller, truncate to [`usize`]
|
||||
pub fn truncate_usize(self) -> usize {
|
||||
self.0 as _
|
||||
}
|
||||
|
||||
/// Get inner value
|
||||
#[inline(always)]
|
||||
pub fn get(self) -> u64 {
|
||||
self.0
|
||||
}
|
||||
|
||||
/// Construct new address
|
||||
#[inline(always)]
|
||||
pub fn new(val: u64) -> Self {
|
||||
Self(val)
|
||||
}
|
||||
|
||||
/// Do something with inner value
|
||||
#[inline(always)]
|
||||
pub fn map(self, f: impl Fn(u64) -> u64) -> Self {
|
||||
Self(f(self.0))
|
||||
}
|
||||
}
|
||||
|
||||
impl_display!(for Address =>
|
||||
|Address(a)| "{a:0x}"
|
||||
);
|
||||
|
||||
impl<T: AddressOp> ops::Add<T> for Address {
|
||||
type Output = Self;
|
||||
|
||||
#[inline]
|
||||
fn add(self, rhs: T) -> Self::Output {
|
||||
Self(self.0.wrapping_add(rhs.cast_u64()))
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: AddressOp> ops::Sub<T> for Address {
|
||||
type Output = Self;
|
||||
|
||||
#[inline]
|
||||
fn sub(self, rhs: T) -> Self::Output {
|
||||
Self(self.0.wrapping_sub(rhs.cast_u64()))
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: AddressOp> ops::AddAssign<T> for Address {
|
||||
fn add_assign(&mut self, rhs: T) {
|
||||
self.0 = self.0.wrapping_add(rhs.cast_u64())
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: AddressOp> ops::SubAssign<T> for Address {
|
||||
fn sub_assign(&mut self, rhs: T) {
|
||||
self.0 = self.0.wrapping_sub(rhs.cast_u64())
|
||||
}
|
||||
}
|
||||
|
||||
impl From<Address> for u64 {
|
||||
#[inline(always)]
|
||||
fn from(value: Address) -> Self {
|
||||
value.0
|
||||
}
|
||||
}
|
||||
|
||||
impl Debug for Address {
|
||||
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
|
||||
write!(f, "[{:0x}]", self.0)
|
||||
}
|
||||
}
|
||||
|
||||
/// Can perform address operations with
|
||||
pub trait AddressOp {
|
||||
/// Cast to u64, truncating or extending
|
||||
fn cast_u64(self) -> u64;
|
||||
}
|
||||
|
||||
macro_rules! impl_address_ops(($($ty:ty),* $(,)?) => {
|
||||
$(impl AddressOp for $ty {
|
||||
#[inline(always)]
|
||||
fn cast_u64(self) -> u64 { self as _ }
|
||||
})*
|
||||
});
|
||||
|
||||
impl_address_ops!(u8, u16, u32, u64, usize);
|
||||
|
|
@ -1,86 +0,0 @@
|
|||
//! Memory implementations
|
||||
|
||||
pub mod softpaging;
|
||||
|
||||
mod addr;
|
||||
|
||||
pub use addr::Address;
|
||||
|
||||
use {crate::utils::impl_display, hbbytecode::ProgramVal};
|
||||
|
||||
/// Load-store memory access
|
||||
pub trait Memory {
|
||||
/// Load data from memory on address
|
||||
///
|
||||
/// # Safety
|
||||
/// - Shall not overrun the buffer
|
||||
unsafe fn load(
|
||||
&mut self,
|
||||
addr: Address,
|
||||
target: *mut u8,
|
||||
count: usize,
|
||||
) -> Result<(), LoadError>;
|
||||
|
||||
/// Store data to memory on address
|
||||
///
|
||||
/// # Safety
|
||||
/// - Shall not overrun the buffer
|
||||
unsafe fn store(
|
||||
&mut self,
|
||||
addr: Address,
|
||||
source: *const u8,
|
||||
count: usize,
|
||||
) -> Result<(), StoreError>;
|
||||
|
||||
/// Read from program memory to execute
|
||||
///
|
||||
/// # Safety
|
||||
/// - Data read have to be valid
|
||||
unsafe fn prog_read<T: ProgramVal>(&mut self, addr: Address) -> Option<T>;
|
||||
|
||||
/// Read from program memory to exectue
|
||||
///
|
||||
/// # Safety
|
||||
/// - You have to be really sure that these bytes are there, understand?
|
||||
unsafe fn prog_read_unchecked<T: ProgramVal>(&mut self, addr: Address) -> T;
|
||||
}
|
||||
|
||||
/// Unhandled load access trap
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub struct LoadError(pub Address);
|
||||
impl_display!(for LoadError =>
|
||||
|LoadError(a)| "Load access error at address {a}",
|
||||
);
|
||||
|
||||
/// Unhandled store access trap
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub struct StoreError(pub Address);
|
||||
impl_display!(for StoreError =>
|
||||
|StoreError(a)| "Load access error at address {a}",
|
||||
);
|
||||
|
||||
/// Reason to access memory
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub enum MemoryAccessReason {
|
||||
/// Memory was accessed for load (read)
|
||||
Load,
|
||||
/// Memory was accessed for store (write)
|
||||
Store,
|
||||
}
|
||||
|
||||
impl_display!(for MemoryAccessReason => match {
|
||||
Self::Load => const "Load";
|
||||
Self::Store => const "Store";
|
||||
});
|
||||
|
||||
impl From<LoadError> for crate::VmRunError {
|
||||
fn from(value: LoadError) -> Self {
|
||||
Self::LoadAccessEx(value.0)
|
||||
}
|
||||
}
|
||||
|
||||
impl From<StoreError> for crate::VmRunError {
|
||||
fn from(value: StoreError) -> Self {
|
||||
Self::StoreAccessEx(value.0)
|
||||
}
|
||||
}
|
||||
|
|
@ -1,109 +0,0 @@
|
|||
//! Program instruction cache
|
||||
|
||||
use crate::mem::Address;
|
||||
|
||||
use {
|
||||
super::{lookup::AddrPageLookuper, paging::PageTable, PageSize},
|
||||
core::{
|
||||
mem::{size_of, MaybeUninit},
|
||||
ptr::{copy_nonoverlapping, NonNull},
|
||||
},
|
||||
};
|
||||
|
||||
/// Instruction cache
|
||||
#[derive(Clone, Debug)]
|
||||
pub struct ICache {
|
||||
/// Current page address base
|
||||
base: Address,
|
||||
/// Curent page pointer
|
||||
data: Option<NonNull<u8>>,
|
||||
/// Current page size
|
||||
size: PageSize,
|
||||
/// Address mask
|
||||
mask: u64,
|
||||
}
|
||||
|
||||
impl Default for ICache {
|
||||
fn default() -> Self {
|
||||
Self {
|
||||
base: Address::NULL,
|
||||
data: Default::default(),
|
||||
size: PageSize::Size4K,
|
||||
mask: Default::default(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl ICache {
|
||||
/// Fetch instruction from cache
|
||||
///
|
||||
/// # Safety
|
||||
/// `T` should be valid to read from instruction memory
|
||||
pub(super) unsafe fn fetch<T>(
|
||||
&mut self,
|
||||
addr: Address,
|
||||
root_pt: *const PageTable,
|
||||
) -> Option<T> {
|
||||
let mut ret = MaybeUninit::<T>::uninit();
|
||||
|
||||
let pbase = self
|
||||
.data
|
||||
.or_else(|| self.fetch_page(self.base + self.size, root_pt))?;
|
||||
|
||||
// Get address base
|
||||
let base = addr.map(|x| x & self.mask);
|
||||
|
||||
// Base not matching, fetch anew
|
||||
if base != self.base {
|
||||
self.fetch_page(base, root_pt)?;
|
||||
};
|
||||
|
||||
let offset = addr.get() & !self.mask;
|
||||
let requ_size = size_of::<T>();
|
||||
|
||||
// Page overflow
|
||||
let rem = (offset as usize)
|
||||
.saturating_add(requ_size)
|
||||
.saturating_sub(self.size as _);
|
||||
let first_copy = requ_size.saturating_sub(rem);
|
||||
|
||||
// Copy non-overflowing part
|
||||
copy_nonoverlapping(pbase.as_ptr(), ret.as_mut_ptr().cast::<u8>(), first_copy);
|
||||
|
||||
// Copy overflow
|
||||
if rem != 0 {
|
||||
let pbase = self.fetch_page(self.base + self.size, root_pt)?;
|
||||
|
||||
// Unlikely, unsupported scenario
|
||||
if rem > self.size as _ {
|
||||
return None;
|
||||
}
|
||||
|
||||
copy_nonoverlapping(
|
||||
pbase.as_ptr(),
|
||||
ret.as_mut_ptr().cast::<u8>().add(first_copy),
|
||||
rem,
|
||||
);
|
||||
}
|
||||
|
||||
Some(ret.assume_init())
|
||||
}
|
||||
|
||||
/// Fetch a page
|
||||
unsafe fn fetch_page(&mut self, addr: Address, pt: *const PageTable) -> Option<NonNull<u8>> {
|
||||
let res = AddrPageLookuper::new(addr, 0, pt).next()?.ok()?;
|
||||
if !super::perm_check::executable(res.perm) {
|
||||
return None;
|
||||
}
|
||||
|
||||
(self.size, self.mask) = match res.size {
|
||||
4096 => (PageSize::Size4K, !((1 << 8) - 1)),
|
||||
2097152 => (PageSize::Size2M, !((1 << (8 * 2)) - 1)),
|
||||
1073741824 => (PageSize::Size1G, !((1 << (8 * 3)) - 1)),
|
||||
_ => return None,
|
||||
};
|
||||
self.data = Some(NonNull::new(res.ptr)?);
|
||||
self.base = addr.map(|x| x & self.mask);
|
||||
self.data
|
||||
}
|
||||
}
|
||||
|
|
@ -1,126 +0,0 @@
|
|||
//! Address lookup
|
||||
|
||||
use crate::mem::addr::Address;
|
||||
|
||||
use super::{
|
||||
addr_extract_index,
|
||||
paging::{PageTable, Permission},
|
||||
PageSize,
|
||||
};
|
||||
|
||||
/// Good result from address split
|
||||
pub struct AddrPageLookupOk {
|
||||
/// Virtual address
|
||||
pub vaddr: Address,
|
||||
|
||||
/// Pointer to the start for perform operation
|
||||
pub ptr: *mut u8,
|
||||
|
||||
/// Size to the end of page / end of desired size
|
||||
pub size: usize,
|
||||
|
||||
/// Page permission
|
||||
pub perm: Permission,
|
||||
}
|
||||
|
||||
/// Errornous address split result
|
||||
pub struct AddrPageLookupError {
|
||||
/// Address of failure
|
||||
pub addr: Address,
|
||||
|
||||
/// Requested page size
|
||||
pub size: PageSize,
|
||||
}
|
||||
|
||||
/// Address splitter into pages
|
||||
pub struct AddrPageLookuper {
|
||||
/// Current address
|
||||
addr: Address,
|
||||
|
||||
/// Size left
|
||||
size: usize,
|
||||
|
||||
/// Page table
|
||||
pagetable: *const PageTable,
|
||||
}
|
||||
|
||||
impl AddrPageLookuper {
|
||||
/// Create a new page lookuper
|
||||
#[inline]
|
||||
pub const fn new(addr: Address, size: usize, pagetable: *const PageTable) -> Self {
|
||||
Self {
|
||||
addr,
|
||||
size,
|
||||
pagetable,
|
||||
}
|
||||
}
|
||||
|
||||
/// Bump address by size X
|
||||
pub fn bump(&mut self, page_size: PageSize) {
|
||||
self.addr += page_size;
|
||||
self.size = self.size.saturating_sub(page_size as _);
|
||||
}
|
||||
}
|
||||
|
||||
impl Iterator for AddrPageLookuper {
|
||||
type Item = Result<AddrPageLookupOk, AddrPageLookupError>;
|
||||
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
// The end, everything is fine
|
||||
if self.size == 0 {
|
||||
return None;
|
||||
}
|
||||
|
||||
let (base, perm, size, offset) = 'a: {
|
||||
let mut current_pt = self.pagetable;
|
||||
|
||||
// Walk the page table
|
||||
for lvl in (0..5).rev() {
|
||||
// Get an entry
|
||||
unsafe {
|
||||
let entry = (*current_pt)
|
||||
.table
|
||||
.get_unchecked(addr_extract_index(self.addr, lvl));
|
||||
|
||||
let ptr = entry.ptr();
|
||||
match entry.permission() {
|
||||
// No page → page fault
|
||||
Permission::Empty => {
|
||||
return Some(Err(AddrPageLookupError {
|
||||
addr: self.addr,
|
||||
size: PageSize::from_lvl(lvl)?,
|
||||
}))
|
||||
}
|
||||
|
||||
// Node → proceed waking
|
||||
Permission::Node => current_pt = ptr as _,
|
||||
|
||||
// Leaf → return relevant data
|
||||
perm => {
|
||||
break 'a (
|
||||
// Pointer in host memory
|
||||
ptr as *mut u8,
|
||||
perm,
|
||||
PageSize::from_lvl(lvl)?,
|
||||
// In-page offset
|
||||
addr_extract_index(self.addr, lvl),
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return None; // Reached the end (should not happen)
|
||||
};
|
||||
|
||||
// Get available byte count in the selected page with offset
|
||||
let avail = (size as usize).saturating_sub(offset).clamp(0, self.size);
|
||||
self.bump(size);
|
||||
|
||||
Some(Ok(AddrPageLookupOk {
|
||||
vaddr: self.addr,
|
||||
ptr: unsafe { base.add(offset) }, // Return pointer to the start of region
|
||||
size: avail,
|
||||
perm,
|
||||
}))
|
||||
}
|
||||
}
|
||||
|
|
@ -1,166 +0,0 @@
|
|||
//! Automatic memory mapping
|
||||
|
||||
use crate::{mem::addr::Address, utils::impl_display};
|
||||
|
||||
use {
|
||||
super::{
|
||||
addr_extract_index,
|
||||
paging::{PageTable, Permission, PtEntry, PtPointedData},
|
||||
PageSize, SoftPagedMem,
|
||||
},
|
||||
alloc::boxed::Box,
|
||||
};
|
||||
|
||||
impl<'p, A, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, A, OUT_PROG_EXEC> {
|
||||
/// Maps host's memory into VM's memory
|
||||
///
|
||||
/// # Safety
|
||||
/// - Your faith in the gods of UB
|
||||
/// - Addr-san claims it's fine but who knows is she isn't lying :ferrisSus:
|
||||
/// - Alright, Miri-sama is also fine with this, who knows why
|
||||
pub unsafe fn map(
|
||||
&mut self,
|
||||
host: *mut u8,
|
||||
target: Address,
|
||||
perm: Permission,
|
||||
pagesize: PageSize,
|
||||
) -> Result<(), MapError> {
|
||||
let mut current_pt = self.root_pt;
|
||||
|
||||
// Decide on what level depth are we going
|
||||
let lookup_depth = match pagesize {
|
||||
PageSize::Size4K => 0,
|
||||
PageSize::Size2M => 1,
|
||||
PageSize::Size1G => 2,
|
||||
};
|
||||
|
||||
// Walk pagetable levels
|
||||
for lvl in (lookup_depth + 1..5).rev() {
|
||||
let entry = (*current_pt)
|
||||
.table
|
||||
.get_unchecked_mut(addr_extract_index(target, lvl));
|
||||
|
||||
let ptr = entry.ptr();
|
||||
match entry.permission() {
|
||||
// Still not on target and already seeing empty entry?
|
||||
// No worries! Let's create one (allocates).
|
||||
Permission::Empty => {
|
||||
// Increase children count
|
||||
(*current_pt).childen += 1;
|
||||
|
||||
let table = Box::into_raw(Box::new(PtPointedData {
|
||||
pt: PageTable::default(),
|
||||
}));
|
||||
|
||||
core::ptr::write(entry, PtEntry::new(table, Permission::Node));
|
||||
current_pt = table as _;
|
||||
}
|
||||
// Continue walking
|
||||
Permission::Node => current_pt = ptr as _,
|
||||
|
||||
// There is some entry on place of node
|
||||
_ => return Err(MapError::PageOnNode),
|
||||
}
|
||||
}
|
||||
|
||||
let node = (*current_pt)
|
||||
.table
|
||||
.get_unchecked_mut(addr_extract_index(target, lookup_depth));
|
||||
|
||||
// Check if node is not mapped
|
||||
if node.permission() != Permission::Empty {
|
||||
return Err(MapError::AlreadyMapped);
|
||||
}
|
||||
|
||||
// Write entry
|
||||
(*current_pt).childen += 1;
|
||||
core::ptr::write(node, PtEntry::new(host.cast(), perm));
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Unmaps pages from VM's memory
|
||||
///
|
||||
/// If errors, it only means there is no entry to unmap and in most cases
|
||||
/// just should be ignored.
|
||||
pub fn unmap(&mut self, addr: Address) -> Result<(), NothingToUnmap> {
|
||||
let mut current_pt = self.root_pt;
|
||||
let mut page_tables = [core::ptr::null_mut(); 5];
|
||||
|
||||
// Walk page table in reverse
|
||||
for lvl in (0..5).rev() {
|
||||
let entry = unsafe {
|
||||
(*current_pt)
|
||||
.table
|
||||
.get_unchecked_mut(addr_extract_index(addr, lvl))
|
||||
};
|
||||
|
||||
let ptr = entry.ptr();
|
||||
match entry.permission() {
|
||||
// Nothing is there, throw an error, not critical!
|
||||
Permission::Empty => return Err(NothingToUnmap),
|
||||
// Node – Save to visited pagetables and continue walking
|
||||
Permission::Node => {
|
||||
page_tables[lvl as usize] = entry;
|
||||
current_pt = ptr as _
|
||||
}
|
||||
// Page entry – zero it out!
|
||||
// Zero page entry is completely valid entry with
|
||||
// empty permission - no UB here!
|
||||
_ => unsafe {
|
||||
core::ptr::write_bytes(entry, 0, 1);
|
||||
break;
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
// Now walk in order visited page tables
|
||||
for entry in page_tables.into_iter() {
|
||||
// Level not visited, skip.
|
||||
if entry.is_null() {
|
||||
continue;
|
||||
}
|
||||
|
||||
unsafe {
|
||||
let children = &mut (*(*entry).ptr()).pt.childen;
|
||||
*children -= 1; // Decrease children count
|
||||
|
||||
// If there are no children, deallocate.
|
||||
if *children == 0 {
|
||||
let _ = Box::from_raw((*entry).ptr() as *mut PageTable);
|
||||
|
||||
// Zero visited entry
|
||||
core::ptr::write_bytes(entry, 0, 1);
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
/// Error mapping
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub enum MapError {
|
||||
/// Entry was already mapped
|
||||
AlreadyMapped,
|
||||
/// When walking a page entry was
|
||||
/// encounterd.
|
||||
PageOnNode,
|
||||
}
|
||||
|
||||
impl_display!(for MapError => match {
|
||||
Self::AlreadyMapped => "There is already a page mapped on specified address";
|
||||
Self::PageOnNode => "There was a page mapped on the way instead of node";
|
||||
});
|
||||
|
||||
/// There was no entry in page table to unmap
|
||||
///
|
||||
/// No worry, don't panic, nothing bad has happened,
|
||||
/// but if you are 120% sure there should be something,
|
||||
/// double-check your addresses.
|
||||
#[derive(Clone, Copy, Debug)]
|
||||
pub struct NothingToUnmap;
|
||||
impl_display!(for NothingToUnmap => "There is no entry to unmap");
|
||||
|
|
@ -1,296 +0,0 @@
|
|||
//! Platform independent, software paged memory implementation
|
||||
|
||||
pub mod icache;
|
||||
pub mod lookup;
|
||||
pub mod paging;
|
||||
|
||||
#[cfg(feature = "alloc")]
|
||||
pub mod mapping;
|
||||
|
||||
use {
|
||||
super::{addr::Address, LoadError, Memory, MemoryAccessReason, StoreError},
|
||||
core::mem::size_of,
|
||||
icache::ICache,
|
||||
lookup::{AddrPageLookupError, AddrPageLookupOk, AddrPageLookuper},
|
||||
paging::{PageTable, Permission},
|
||||
};
|
||||
|
||||
/// HoleyBytes software paged memory
|
||||
///
|
||||
/// - `OUT_PROG_EXEC`: set to `false` to disable executing program
|
||||
/// not contained in initially provided program, even the pages
|
||||
/// are executable
|
||||
#[derive(Clone, Debug)]
|
||||
pub struct SoftPagedMem<'p, PfH, const OUT_PROG_EXEC: bool = true> {
|
||||
/// Root page table
|
||||
pub root_pt: *mut PageTable,
|
||||
/// Page fault handler
|
||||
pub pf_handler: PfH,
|
||||
/// Program memory segment
|
||||
pub program: &'p [u8],
|
||||
/// Program instruction cache
|
||||
pub icache: ICache,
|
||||
}
|
||||
|
||||
impl<'p, PfH: HandlePageFault, const OUT_PROG_EXEC: bool> Memory
|
||||
for SoftPagedMem<'p, PfH, OUT_PROG_EXEC>
|
||||
{
|
||||
/// Load value from an address
|
||||
///
|
||||
/// # Safety
|
||||
/// Applies same conditions as for [`core::ptr::copy_nonoverlapping`]
|
||||
unsafe fn load(
|
||||
&mut self,
|
||||
addr: Address,
|
||||
target: *mut u8,
|
||||
count: usize,
|
||||
) -> Result<(), LoadError> {
|
||||
self.memory_access(
|
||||
MemoryAccessReason::Load,
|
||||
addr,
|
||||
target,
|
||||
count,
|
||||
perm_check::readable,
|
||||
|src, dst, count| core::ptr::copy_nonoverlapping(src, dst, count),
|
||||
)
|
||||
.map_err(LoadError)
|
||||
}
|
||||
|
||||
/// Store value to an address
|
||||
///
|
||||
/// # Safety
|
||||
/// Applies same conditions as for [`core::ptr::copy_nonoverlapping`]
|
||||
unsafe fn store(
|
||||
&mut self,
|
||||
addr: Address,
|
||||
source: *const u8,
|
||||
count: usize,
|
||||
) -> Result<(), StoreError> {
|
||||
self.memory_access(
|
||||
MemoryAccessReason::Store,
|
||||
addr,
|
||||
source.cast_mut(),
|
||||
count,
|
||||
perm_check::writable,
|
||||
|dst, src, count| core::ptr::copy_nonoverlapping(src, dst, count),
|
||||
)
|
||||
.map_err(StoreError)
|
||||
}
|
||||
|
||||
#[inline(always)]
|
||||
unsafe fn prog_read<T>(&mut self, addr: Address) -> Option<T> {
|
||||
if OUT_PROG_EXEC && addr.truncate_usize() > self.program.len() {
|
||||
return self.icache.fetch::<T>(addr, self.root_pt);
|
||||
}
|
||||
|
||||
let addr = addr.truncate_usize();
|
||||
self.program
|
||||
.get(addr..addr + size_of::<T>())
|
||||
.map(|x| x.as_ptr().cast::<T>().read())
|
||||
}
|
||||
|
||||
#[inline(always)]
|
||||
unsafe fn prog_read_unchecked<T>(&mut self, addr: Address) -> T {
|
||||
if OUT_PROG_EXEC && addr.truncate_usize() > self.program.len() {
|
||||
return self
|
||||
.icache
|
||||
.fetch::<T>(addr, self.root_pt)
|
||||
.unwrap_or_else(|| core::mem::zeroed());
|
||||
}
|
||||
|
||||
self.program
|
||||
.as_ptr()
|
||||
.add(addr.truncate_usize())
|
||||
.cast::<T>()
|
||||
.read()
|
||||
}
|
||||
}
|
||||
|
||||
impl<'p, PfH: HandlePageFault, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, PfH, OUT_PROG_EXEC> {
|
||||
// Everyone behold, the holy function, the god of HBVM memory accesses!
|
||||
|
||||
/// Split address to pages, check their permissions and feed pointers with offset
|
||||
/// to a specified function.
|
||||
///
|
||||
/// If page is not found, execute page fault trap handler.
|
||||
#[allow(clippy::too_many_arguments)] // Silence peasant
|
||||
fn memory_access(
|
||||
&mut self,
|
||||
reason: MemoryAccessReason,
|
||||
src: Address,
|
||||
mut dst: *mut u8,
|
||||
len: usize,
|
||||
permission_check: fn(Permission) -> bool,
|
||||
action: fn(*mut u8, *mut u8, usize),
|
||||
) -> Result<(), Address> {
|
||||
// Memory load from program section
|
||||
let (src, len) = if src.truncate_usize() < self.program.len() as _ {
|
||||
// Allow only loads
|
||||
if reason != MemoryAccessReason::Load {
|
||||
return Err(src);
|
||||
}
|
||||
|
||||
// Determine how much data to copy from here
|
||||
let to_copy = len.clamp(0, self.program.len().saturating_sub(src.truncate_usize()));
|
||||
|
||||
// Perform action
|
||||
action(
|
||||
unsafe { self.program.as_ptr().add(src.truncate_usize()).cast_mut() },
|
||||
dst,
|
||||
to_copy,
|
||||
);
|
||||
|
||||
// Return shifted from what we've already copied
|
||||
(
|
||||
src.saturating_add(to_copy as u64),
|
||||
len.saturating_sub(to_copy),
|
||||
)
|
||||
} else {
|
||||
(src, len) // Nothing weird!
|
||||
};
|
||||
|
||||
// Nothing to copy? Don't bother doing anything, bail.
|
||||
if len == 0 {
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
// Create new splitter
|
||||
let mut pspl = AddrPageLookuper::new(src, len, self.root_pt);
|
||||
loop {
|
||||
match pspl.next() {
|
||||
// Page is found
|
||||
Some(Ok(AddrPageLookupOk {
|
||||
vaddr,
|
||||
ptr,
|
||||
size,
|
||||
perm,
|
||||
})) => {
|
||||
if !permission_check(perm) {
|
||||
return Err(vaddr);
|
||||
}
|
||||
|
||||
// Perform specified memory action and bump destination pointer
|
||||
action(ptr, dst, size);
|
||||
dst = unsafe { dst.add(size) };
|
||||
}
|
||||
// No page found
|
||||
Some(Err(AddrPageLookupError { addr, size })) => {
|
||||
// Attempt to execute page fault handler
|
||||
if self.pf_handler.page_fault(
|
||||
reason,
|
||||
unsafe { &mut *self.root_pt },
|
||||
addr,
|
||||
size,
|
||||
dst,
|
||||
) {
|
||||
// Shift the splitter address
|
||||
pspl.bump(size);
|
||||
|
||||
// Bump dst pointer
|
||||
dst = unsafe { dst.add(size as _) };
|
||||
} else {
|
||||
return Err(addr); // Unhandleable, VM will yield.
|
||||
}
|
||||
}
|
||||
// No remaining pages, we are done!
|
||||
None => return Ok(()),
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Extract index in page table on specified level
|
||||
///
|
||||
/// The level shall not be larger than 4, otherwise
|
||||
/// the output of the function is unspecified (yes, it can also panic :)
|
||||
pub fn addr_extract_index(addr: Address, lvl: u8) -> usize {
|
||||
debug_assert!(lvl <= 4);
|
||||
let addr = addr.get();
|
||||
usize::try_from((addr >> (lvl * 8 + 12)) & ((1 << 8) - 1)).expect("?conradluget a better CPU")
|
||||
}
|
||||
|
||||
/// Page size
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub enum PageSize {
|
||||
/// 4 KiB page (on level 0)
|
||||
Size4K = 4096,
|
||||
|
||||
/// 2 MiB page (on level 1)
|
||||
Size2M = 1024 * 1024 * 2,
|
||||
|
||||
/// 1 GiB page (on level 2)
|
||||
Size1G = 1024 * 1024 * 1024,
|
||||
}
|
||||
|
||||
impl PageSize {
|
||||
/// Convert page table level to size of page
|
||||
const fn from_lvl(lvl: u8) -> Option<Self> {
|
||||
match lvl {
|
||||
0 => Some(PageSize::Size4K),
|
||||
1 => Some(PageSize::Size2M),
|
||||
2 => Some(PageSize::Size1G),
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl core::ops::Add<PageSize> for Address {
|
||||
type Output = Self;
|
||||
|
||||
#[inline(always)]
|
||||
fn add(self, rhs: PageSize) -> Self::Output {
|
||||
self + (rhs as u64)
|
||||
}
|
||||
}
|
||||
|
||||
impl core::ops::AddAssign<PageSize> for Address {
|
||||
#[inline(always)]
|
||||
fn add_assign(&mut self, rhs: PageSize) {
|
||||
*self = Self::new(self.get().wrapping_add(rhs as u64));
|
||||
}
|
||||
}
|
||||
|
||||
/// Permisison checks
|
||||
pub mod perm_check {
|
||||
use super::paging::Permission;
|
||||
|
||||
/// Page is readable
|
||||
#[inline(always)]
|
||||
pub const fn readable(perm: Permission) -> bool {
|
||||
matches!(
|
||||
perm,
|
||||
Permission::Readonly | Permission::Write | Permission::Exec
|
||||
)
|
||||
}
|
||||
|
||||
/// Page is writable
|
||||
#[inline(always)]
|
||||
pub const fn writable(perm: Permission) -> bool {
|
||||
matches!(perm, Permission::Write)
|
||||
}
|
||||
|
||||
/// Page is executable
|
||||
#[inline(always)]
|
||||
pub const fn executable(perm: Permission) -> bool {
|
||||
matches!(perm, Permission::Exec)
|
||||
}
|
||||
}
|
||||
|
||||
/// Handle VM traps
|
||||
pub trait HandlePageFault {
|
||||
/// Handle page fault
|
||||
///
|
||||
/// Return true if handling was sucessful,
|
||||
/// otherwise the program will be interrupted and will
|
||||
/// yield an error.
|
||||
fn page_fault(
|
||||
&mut self,
|
||||
reason: MemoryAccessReason,
|
||||
pagetable: &mut PageTable,
|
||||
vaddr: Address,
|
||||
size: PageSize,
|
||||
dataptr: *mut u8,
|
||||
) -> bool
|
||||
where
|
||||
Self: Sized;
|
||||
}
|
||||
|
|
@ -1,86 +0,0 @@
|
|||
//! Page table and associated structures implementation
|
||||
|
||||
use core::{fmt::Debug, mem::MaybeUninit};
|
||||
|
||||
/// Page entry permission
|
||||
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
|
||||
#[repr(u8)]
|
||||
pub enum Permission {
|
||||
/// No page present
|
||||
#[default]
|
||||
Empty,
|
||||
/// Points to another pagetable
|
||||
Node,
|
||||
/// Page is read only
|
||||
Readonly,
|
||||
/// Page is readable and writable
|
||||
Write,
|
||||
/// Page is readable and executable
|
||||
Exec,
|
||||
}
|
||||
|
||||
/// Page table entry
|
||||
#[derive(Clone, Copy, Default, PartialEq, Eq)]
|
||||
pub struct PtEntry(u64);
|
||||
impl PtEntry {
|
||||
/// Create new
|
||||
///
|
||||
/// # Safety
|
||||
/// - `ptr` has to point to valid data and shall not be deallocated
|
||||
/// troughout the entry lifetime
|
||||
#[inline]
|
||||
pub unsafe fn new(ptr: *mut PtPointedData, permission: Permission) -> Self {
|
||||
Self(ptr as u64 | permission as u64)
|
||||
}
|
||||
|
||||
/// Get permission
|
||||
#[inline]
|
||||
pub fn permission(&self) -> Permission {
|
||||
unsafe { core::mem::transmute(self.0 as u8 & 0b111) }
|
||||
}
|
||||
|
||||
/// Get pointer to the data (leaf) or next page table (node)
|
||||
#[inline]
|
||||
pub fn ptr(&self) -> *mut PtPointedData {
|
||||
(self.0 & !((1 << 12) - 1)) as _
|
||||
}
|
||||
}
|
||||
|
||||
impl Debug for PtEntry {
|
||||
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
|
||||
f.debug_struct("PtEntry")
|
||||
.field("ptr", &self.ptr())
|
||||
.field("permission", &self.permission())
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
/// Page table
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
#[repr(align(4096))]
|
||||
pub struct PageTable {
|
||||
/// How much entries are in use
|
||||
pub childen: u8,
|
||||
/// Entries
|
||||
pub table: [PtEntry; 256],
|
||||
}
|
||||
|
||||
impl Default for PageTable {
|
||||
fn default() -> Self {
|
||||
// SAFETY: It's fine, zeroed page table entry is valid (= empty)
|
||||
Self {
|
||||
childen: 0,
|
||||
table: unsafe { MaybeUninit::zeroed().assume_init() },
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Data page table entry can possibly point to
|
||||
#[derive(Clone, Copy)]
|
||||
#[repr(C, align(4096))]
|
||||
pub union PtPointedData {
|
||||
/// Node - next page table
|
||||
pub pt: PageTable,
|
||||
/// Leaf
|
||||
pub page: u8,
|
||||
}
|
||||
|
|
@ -1,53 +0,0 @@
|
|||
macro_rules! impl_display {
|
||||
(for $ty:ty => $(|$selfty:pat_param|)? $fmt:literal $(, $($param:expr),+)? $(,)?) => {
|
||||
impl ::core::fmt::Display for $ty {
|
||||
fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
|
||||
$(let $selfty = self;)?
|
||||
write!(f, $fmt, $($param),*)
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
(for $ty:ty => $str:literal) => {
|
||||
impl ::core::fmt::Display for $ty {
|
||||
fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
|
||||
f.write_str($str)
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
(for $ty:ty => match {$(
|
||||
$bind:pat => $($const:ident)? $fmt:literal $(,$($params:tt)*)?;
|
||||
)*}) => {
|
||||
impl ::core::fmt::Display for $ty {
|
||||
fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
|
||||
match self {
|
||||
$(
|
||||
$bind => $crate::utils::internal::impl_display_match_fragment!($($const,)? f, $fmt $(, $($params)*)?)
|
||||
),*
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[doc(hidden)]
|
||||
pub(crate) mod internal {
|
||||
macro_rules! impl_display_match_fragment {
|
||||
(const, $f:expr, $lit:literal) => {
|
||||
$f.write_str($lit)
|
||||
};
|
||||
|
||||
($f:expr, $fmt:literal $(, $($params:tt)*)?) => {
|
||||
write!($f, $fmt, $($($params)*)?)
|
||||
};
|
||||
}
|
||||
|
||||
pub(crate) use impl_display_match_fragment;
|
||||
}
|
||||
|
||||
macro_rules! static_assert_eq(($l:expr, $r:expr $(,)?) => {
|
||||
const _: [(); ($l != $r) as usize] = [];
|
||||
});
|
||||
|
||||
pub(crate) use {impl_display, static_assert_eq};
|
||||
52
hbvm/src/validate.rs
Normal file
52
hbvm/src/validate.rs
Normal file
|
|
@ -0,0 +1,52 @@
|
|||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub enum ErrorKind {
|
||||
InvalidInstruction,
|
||||
Unimplemented,
|
||||
RegisterArrayOverflow,
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub struct Error {
|
||||
pub kind: ErrorKind,
|
||||
pub index: usize,
|
||||
}
|
||||
|
||||
pub fn validate(mut program: &[u8]) -> Result<(), Error> {
|
||||
use hbbytecode::opcode::*;
|
||||
|
||||
let start = program;
|
||||
loop {
|
||||
program = match program {
|
||||
[] => return Ok(()),
|
||||
[LD..=ST, reg, _, _, _, _, _, _, _, _, _, count, ..]
|
||||
if usize::from(*reg) * 8 + usize::from(*count) > 2048 =>
|
||||
{
|
||||
return Err(Error {
|
||||
kind: ErrorKind::RegisterArrayOverflow,
|
||||
index: (program.as_ptr() as usize) - (start.as_ptr() as usize),
|
||||
})
|
||||
}
|
||||
[BRC, src, dst, count, ..]
|
||||
if src.checked_add(*count).is_none() || dst.checked_add(*count).is_none() =>
|
||||
{
|
||||
return Err(Error {
|
||||
kind: ErrorKind::RegisterArrayOverflow,
|
||||
index: (program.as_ptr() as usize) - (start.as_ptr() as usize),
|
||||
})
|
||||
}
|
||||
[NOP | ECALL, rest @ ..]
|
||||
| [DIR | DIRF, _, _, _, _, rest @ ..]
|
||||
| [ADD..=CMPU | BRC | ADDF..=MULF, _, _, _, rest @ ..]
|
||||
| [NEG..=NOT | CP..=SWA, _, _, rest @ ..]
|
||||
| [LI | JMP, _, _, _, _, _, _, _, _, _, rest @ ..]
|
||||
| [ADDI..=CMPUI | BMC | JEQ..=JGTU | ADDFI..=MULFI, _, _, _, _, _, _, _, _, _, _, rest @ ..]
|
||||
| [LD..=ST, _, _, _, _, _, _, _, _, _, _, _, _, rest @ ..] => rest,
|
||||
_ => {
|
||||
return Err(Error {
|
||||
kind: ErrorKind::InvalidInstruction,
|
||||
index: (program.as_ptr() as usize) - (start.as_ptr() as usize),
|
||||
})
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1,80 +0,0 @@
|
|||
//! HoleyBytes register value definition
|
||||
|
||||
/// Define [`Value`] union
|
||||
///
|
||||
/// # Safety
|
||||
/// Union variants have to be sound to byte-reinterpretate
|
||||
/// between each other. Otherwise the behaviour is undefined.
|
||||
macro_rules! value_def {
|
||||
($($ty:ident),* $(,)?) => {
|
||||
/// HBVM register value
|
||||
#[derive(Copy, Clone)]
|
||||
#[repr(packed)]
|
||||
pub union Value {
|
||||
$(
|
||||
#[doc = concat!(stringify!($ty), " type")]
|
||||
pub $ty: $ty
|
||||
),*
|
||||
}
|
||||
|
||||
|
||||
$(
|
||||
impl From<$ty> for Value {
|
||||
#[inline]
|
||||
fn from(value: $ty) -> Self {
|
||||
Self { $ty: value }
|
||||
}
|
||||
}
|
||||
|
||||
crate::utils::static_assert_eq!(
|
||||
core::mem::size_of::<$ty>(),
|
||||
core::mem::size_of::<Value>(),
|
||||
);
|
||||
|
||||
impl private::Sealed for $ty {}
|
||||
unsafe impl ValueVariant for $ty {}
|
||||
)*
|
||||
};
|
||||
}
|
||||
|
||||
impl Value {
|
||||
/// Byte reinterpret value to target variant
|
||||
#[inline]
|
||||
pub fn cast<V: ValueVariant>(self) -> V {
|
||||
/// Evil.
|
||||
///
|
||||
/// Transmute cannot be performed with generic type
|
||||
/// as size is unknown, so union is used.
|
||||
///
|
||||
/// # Safety
|
||||
/// If [`ValueVariant`] implemented correctly, it's fine :)
|
||||
///
|
||||
/// :ferrisClueless:
|
||||
union Transmute<Variant: ValueVariant> {
|
||||
/// Self
|
||||
src: Value,
|
||||
/// Target variant
|
||||
variant: Variant,
|
||||
}
|
||||
|
||||
unsafe { Transmute { src: self }.variant }
|
||||
}
|
||||
}
|
||||
|
||||
/// # Safety
|
||||
/// - N/A, not to be implemented manually
|
||||
pub unsafe trait ValueVariant: private::Sealed + Copy + Into<Value> {}
|
||||
|
||||
mod private {
|
||||
pub trait Sealed {}
|
||||
}
|
||||
|
||||
value_def!(u64, i64, f64);
|
||||
crate::utils::static_assert_eq!(core::mem::size_of::<Value>(), 8);
|
||||
|
||||
impl core::fmt::Debug for Value {
|
||||
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
|
||||
// Print formatted as hexadecimal, unsigned integer
|
||||
write!(f, "{:x}", self.cast::<u64>())
|
||||
}
|
||||
}
|
||||
238
hbvm/src/vm/mem/mod.rs
Normal file
238
hbvm/src/vm/mem/mod.rs
Normal file
|
|
@ -0,0 +1,238 @@
|
|||
mod paging;
|
||||
|
||||
use self::paging::{PageTable, Permission, PtEntry};
|
||||
use alloc::boxed::Box;
|
||||
|
||||
#[derive(Clone, Debug)]
|
||||
pub struct Memory {
|
||||
root_pt: *mut PageTable,
|
||||
}
|
||||
|
||||
impl Default for Memory {
|
||||
fn default() -> Self {
|
||||
Self {
|
||||
root_pt: Box::into_raw(Box::default()),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Drop for Memory {
|
||||
fn drop(&mut self) {
|
||||
let _ = unsafe { Box::from_raw(self.root_pt) };
|
||||
}
|
||||
}
|
||||
|
||||
impl Memory {
|
||||
// HACK: Just for allocation testing, will be removed when proper memory interfaces
|
||||
// implemented.
|
||||
pub fn insert_test_page(&mut self) {
|
||||
unsafe {
|
||||
let mut entry = PtEntry::new(
|
||||
{
|
||||
let layout = alloc::alloc::Layout::from_size_align_unchecked(4096, 4096);
|
||||
let ptr = alloc::alloc::alloc_zeroed(layout);
|
||||
if ptr.is_null() {
|
||||
alloc::alloc::handle_alloc_error(layout);
|
||||
}
|
||||
|
||||
core::ptr::write_bytes(ptr, 69, 10);
|
||||
ptr.cast()
|
||||
},
|
||||
Permission::Write,
|
||||
);
|
||||
|
||||
for _ in 0..4 {
|
||||
let mut pt = Box::<PageTable>::default();
|
||||
pt[0] = entry;
|
||||
entry = PtEntry::new(Box::into_raw(pt) as _, Permission::Node);
|
||||
}
|
||||
|
||||
self.root_pt_mut()[0] = entry;
|
||||
}
|
||||
}
|
||||
|
||||
/// Load value from an address
|
||||
pub unsafe fn load(&self, addr: u64, target: *mut u8, count: usize) -> Result<(), AccessFault> {
|
||||
self.memory_access(
|
||||
addr,
|
||||
target,
|
||||
count,
|
||||
|perm| {
|
||||
matches!(
|
||||
perm,
|
||||
Permission::Readonly | Permission::Write | Permission::Exec
|
||||
)
|
||||
},
|
||||
|src, dst, count| core::ptr::copy_nonoverlapping(src, dst, count),
|
||||
)
|
||||
}
|
||||
|
||||
/// Store value to an address
|
||||
pub unsafe fn store(
|
||||
&mut self,
|
||||
addr: u64,
|
||||
source: *const u8,
|
||||
count: usize,
|
||||
) -> Result<(), AccessFault> {
|
||||
self.memory_access(
|
||||
addr,
|
||||
source.cast_mut(),
|
||||
count,
|
||||
|perm| perm == Permission::Write,
|
||||
|dst, src, count| core::ptr::copy_nonoverlapping(src, dst, count),
|
||||
)
|
||||
}
|
||||
|
||||
/// Copy a block of memory
|
||||
pub unsafe fn block_copy(&mut self, src: u64, dst: u64, count: u64) -> Result<(), ()> {
|
||||
/* let count = usize::try_from(count).expect("?conradluget a better CPU");
|
||||
|
||||
let mut srcs = PageSplitter::new(src, count, self.root_pt);
|
||||
let mut dsts = PageSplitter::new(dst, count, self.root_pt);
|
||||
let mut c_src = srcs.next().ok_or(())?;
|
||||
let mut c_dst = dsts.next().ok_or(())?;
|
||||
|
||||
loop {
|
||||
let min_size = c_src.size.min(c_dst.size);
|
||||
unsafe {
|
||||
core::ptr::copy(c_src.ptr, c_dst.ptr, min_size);
|
||||
}
|
||||
|
||||
match (
|
||||
match c_src.size.saturating_sub(min_size) {
|
||||
0 => srcs.next(),
|
||||
size => Some(PageSplitResult { size, ..c_src }),
|
||||
},
|
||||
match c_dst.size.saturating_sub(min_size) {
|
||||
0 => dsts.next(),
|
||||
size => Some(PageSplitResult { size, ..c_dst }),
|
||||
},
|
||||
) {
|
||||
(None, None) => return Ok(()),
|
||||
(Some(src), Some(dst)) => (c_src, c_dst) = (src, dst),
|
||||
_ => return Err(()),
|
||||
}
|
||||
} */
|
||||
|
||||
todo!("Block memory copy")
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn root_pt(&self) -> &PageTable {
|
||||
unsafe { &*self.root_pt }
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn root_pt_mut(&mut self) -> &mut PageTable {
|
||||
unsafe { &mut *self.root_pt }
|
||||
}
|
||||
|
||||
fn memory_access(
|
||||
&self,
|
||||
src: u64,
|
||||
mut dst: *mut u8,
|
||||
len: usize,
|
||||
permission_check: impl Fn(Permission) -> bool,
|
||||
action: impl Fn(*mut u8, *mut u8, usize),
|
||||
) -> Result<(), AccessFault> {
|
||||
for item in PageSplitter::new(src, len, self.root_pt) {
|
||||
let PageSplitResult { ptr, size, perm } = item?;
|
||||
if !permission_check(perm) {
|
||||
return Err(AccessFault::Permission);
|
||||
}
|
||||
|
||||
action(ptr, dst, size);
|
||||
dst = unsafe { dst.add(size) };
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
struct PageSplitResult {
|
||||
ptr: *mut u8,
|
||||
size: usize,
|
||||
perm: Permission,
|
||||
}
|
||||
|
||||
struct PageSplitter {
|
||||
addr: u64,
|
||||
size: usize,
|
||||
pagetable: *const PageTable,
|
||||
}
|
||||
|
||||
impl PageSplitter {
|
||||
pub const fn new(addr: u64, size: usize, pagetable: *const PageTable) -> Self {
|
||||
Self {
|
||||
addr,
|
||||
size,
|
||||
pagetable,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Iterator for PageSplitter {
|
||||
type Item = Result<PageSplitResult, AccessFault>;
|
||||
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
if self.size == 0 {
|
||||
return None;
|
||||
}
|
||||
|
||||
let (base, perm, size, offset) = 'a: {
|
||||
let mut current_pt = self.pagetable;
|
||||
for lvl in (0..5).rev() {
|
||||
unsafe {
|
||||
let entry = (*current_pt).get_unchecked(
|
||||
usize::try_from((self.addr >> (lvl * 9 + 12)) & ((1 << 9) - 1))
|
||||
.expect("?conradluget a better CPU"),
|
||||
);
|
||||
|
||||
let ptr = entry.ptr();
|
||||
match entry.permission() {
|
||||
Permission::Empty => {
|
||||
return Some(Err(AccessFault::NoPage {
|
||||
addr: self.addr,
|
||||
remaining: self.size,
|
||||
}))
|
||||
}
|
||||
Permission::Node => current_pt = ptr as _,
|
||||
perm => {
|
||||
break 'a (
|
||||
ptr as *mut u8,
|
||||
perm,
|
||||
match lvl {
|
||||
0 => 4096,
|
||||
1 => 1024_usize.pow(2) * 2,
|
||||
2 => 1024_usize.pow(3),
|
||||
_ => return Some(Err(AccessFault::TooShallow)),
|
||||
},
|
||||
self.addr as usize & ((1 << (lvl * 9 + 12)) - 1),
|
||||
)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return Some(Err(AccessFault::TooDeep));
|
||||
};
|
||||
|
||||
extern crate std;
|
||||
let avail = (size - offset).clamp(0, self.size);
|
||||
self.addr += size as u64;
|
||||
self.size = self.size.saturating_sub(size);
|
||||
std::dbg!(Some(Ok(PageSplitResult {
|
||||
ptr: unsafe { base.add(offset) },
|
||||
size: avail,
|
||||
perm,
|
||||
})))
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub enum AccessFault {
|
||||
NoPage { addr: u64, remaining: usize },
|
||||
Permission,
|
||||
TooShallow,
|
||||
TooDeep,
|
||||
}
|
||||
101
hbvm/src/vm/mem/paging.rs
Normal file
101
hbvm/src/vm/mem/paging.rs
Normal file
|
|
@ -0,0 +1,101 @@
|
|||
use core::{
|
||||
fmt::Debug,
|
||||
mem::MaybeUninit,
|
||||
ops::{Index, IndexMut},
|
||||
slice::SliceIndex,
|
||||
};
|
||||
use delegate::delegate;
|
||||
|
||||
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
|
||||
#[repr(u8)]
|
||||
pub enum Permission {
|
||||
#[default]
|
||||
Empty,
|
||||
Node,
|
||||
Readonly,
|
||||
Write,
|
||||
Exec,
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy, Default, PartialEq, Eq)]
|
||||
pub struct PtEntry(u64);
|
||||
impl PtEntry {
|
||||
#[inline]
|
||||
pub unsafe fn new(ptr: *mut PtPointedData, permission: Permission) -> Self {
|
||||
Self(ptr as u64 | permission as u64)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn permission(&self) -> Permission {
|
||||
unsafe { core::mem::transmute(self.0 as u8 & 0b111) }
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn ptr(&self) -> *mut PtPointedData {
|
||||
(self.0 & !((1 << 12) - 1)) as _
|
||||
}
|
||||
}
|
||||
|
||||
impl Debug for PtEntry {
|
||||
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
|
||||
f.debug_struct("PtEntry")
|
||||
.field("ptr", &self.ptr())
|
||||
.field("permission", &self.permission())
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
#[repr(align(4096))]
|
||||
pub struct PageTable([PtEntry; 512]);
|
||||
|
||||
impl PageTable {
|
||||
delegate!(to self.0 {
|
||||
pub unsafe fn get<I>(&self, ix: I) -> Option<&I::Output>
|
||||
where I: SliceIndex<[PtEntry]>;
|
||||
|
||||
pub unsafe fn get_mut<I>(&mut self, ix: I) -> Option<&mut I::Output>
|
||||
where I: SliceIndex<[PtEntry]>;
|
||||
|
||||
pub unsafe fn get_unchecked<I>(&self, index: I) -> &I::Output
|
||||
where I: SliceIndex<[PtEntry]>;
|
||||
|
||||
pub unsafe fn get_unchecked_mut<I>(&mut self, index: I) -> &mut I::Output
|
||||
where I: SliceIndex<[PtEntry]>;
|
||||
});
|
||||
}
|
||||
|
||||
impl<Idx> Index<Idx> for PageTable
|
||||
where
|
||||
Idx: SliceIndex<[PtEntry]>,
|
||||
{
|
||||
type Output = Idx::Output;
|
||||
|
||||
#[inline(always)]
|
||||
fn index(&self, index: Idx) -> &Self::Output {
|
||||
&self.0[index]
|
||||
}
|
||||
}
|
||||
|
||||
impl<Idx> IndexMut<Idx> for PageTable
|
||||
where
|
||||
Idx: SliceIndex<[PtEntry]>,
|
||||
{
|
||||
#[inline(always)]
|
||||
fn index_mut(&mut self, index: Idx) -> &mut Self::Output {
|
||||
&mut self.0[index]
|
||||
}
|
||||
}
|
||||
|
||||
impl Default for PageTable {
|
||||
fn default() -> Self {
|
||||
Self(unsafe { MaybeUninit::zeroed().assume_init() })
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy)]
|
||||
#[repr(C, align(4096))]
|
||||
pub union PtPointedData {
|
||||
pub pt: PageTable,
|
||||
pub page: u8,
|
||||
}
|
||||
302
hbvm/src/vm/mod.rs
Normal file
302
hbvm/src/vm/mod.rs
Normal file
|
|
@ -0,0 +1,302 @@
|
|||
//! HoleyBytes Virtual Machine
|
||||
//!
|
||||
//! All unsafe code here should be sound, if input bytecode passes validation.
|
||||
|
||||
// # General safety notice:
|
||||
// - Validation has to assure there is 256 registers (r0 - r255)
|
||||
// - Instructions have to be valid as specified (values and sizes)
|
||||
// - Mapped pages should be at least 4 KiB
|
||||
// - Yes, I am aware of the UB when jumping in-mid of instruction where
|
||||
// the read byte corresponds to an instruction whose lenght exceets the
|
||||
// program size. If you are (rightfully) worried about the UB, for now just
|
||||
// append your program with 11 zeroes.
|
||||
|
||||
use self::mem::AccessFault;
|
||||
|
||||
mod mem;
|
||||
mod value;
|
||||
|
||||
use {
|
||||
crate::validate,
|
||||
core::ops,
|
||||
hbbytecode::{OpParam, ParamBB, ParamBBB, ParamBBBB, ParamBBD, ParamBBDH, ParamBD},
|
||||
mem::Memory,
|
||||
static_assertions::assert_impl_one,
|
||||
value::Value,
|
||||
};
|
||||
|
||||
macro_rules! param {
|
||||
($self:expr, $ty:ty) => {{
|
||||
assert_impl_one!($ty: OpParam);
|
||||
let data = $self
|
||||
.program
|
||||
.as_ptr()
|
||||
.add($self.pc + 1)
|
||||
.cast::<$ty>()
|
||||
.read();
|
||||
$self.pc += 1 + core::mem::size_of::<$ty>();
|
||||
data
|
||||
}};
|
||||
}
|
||||
|
||||
macro_rules! binary_op {
|
||||
($self:expr, $ty:ident, $handler:expr) => {{
|
||||
let ParamBBB(tg, a0, a1) = param!($self, ParamBBB);
|
||||
$self.write_reg(
|
||||
tg,
|
||||
$handler(
|
||||
Value::$ty(&$self.read_reg(a0)),
|
||||
Value::$ty(&$self.read_reg(a1)),
|
||||
)
|
||||
.into(),
|
||||
);
|
||||
}};
|
||||
}
|
||||
|
||||
macro_rules! binary_op_imm {
|
||||
($self:expr, $ty:ident, $handler:expr) => {{
|
||||
let ParamBBD(tg, a0, imm) = param!($self, ParamBBD);
|
||||
$self.write_reg(
|
||||
tg,
|
||||
$handler(Value::$ty(&$self.read_reg(a0)), Value::$ty(&imm.into())).into(),
|
||||
);
|
||||
}};
|
||||
}
|
||||
|
||||
macro_rules! cond_jump {
|
||||
($self:expr, $ty:ident, $expected:ident) => {{
|
||||
let ParamBBD(a0, a1, jt) = param!($self, ParamBBD);
|
||||
if core::cmp::Ord::cmp(&$self.read_reg(a0).as_u64(), &$self.read_reg(a1).as_u64())
|
||||
== core::cmp::Ordering::$expected
|
||||
{
|
||||
$self.pc = jt as usize;
|
||||
}
|
||||
}};
|
||||
}
|
||||
|
||||
pub struct Vm<'a> {
|
||||
pub registers: [Value; 256],
|
||||
pub memory: Memory,
|
||||
pc: usize,
|
||||
program: &'a [u8],
|
||||
}
|
||||
|
||||
impl<'a> Vm<'a> {
|
||||
/// # Safety
|
||||
/// Program code has to be validated
|
||||
pub unsafe fn new_unchecked(program: &'a [u8]) -> Self {
|
||||
Self {
|
||||
registers: [Value::from(0_u64); 256],
|
||||
memory: Default::default(),
|
||||
pc: 0,
|
||||
program,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn new_validated(program: &'a [u8]) -> Result<Self, validate::Error> {
|
||||
validate::validate(program)?;
|
||||
Ok(unsafe { Self::new_unchecked(program) })
|
||||
}
|
||||
|
||||
pub fn run(&mut self) -> HaltReason {
|
||||
use hbbytecode::opcode::*;
|
||||
loop {
|
||||
let Some(&opcode) = self.program.get(self.pc)
|
||||
else { return HaltReason::ProgramEnd };
|
||||
|
||||
unsafe {
|
||||
match opcode {
|
||||
NOP => param!(self, ()),
|
||||
ADD => binary_op!(self, as_u64, u64::wrapping_add),
|
||||
SUB => binary_op!(self, as_u64, u64::wrapping_sub),
|
||||
MUL => binary_op!(self, as_u64, u64::wrapping_mul),
|
||||
AND => binary_op!(self, as_u64, ops::BitAnd::bitand),
|
||||
OR => binary_op!(self, as_u64, ops::BitOr::bitor),
|
||||
XOR => binary_op!(self, as_u64, ops::BitXor::bitxor),
|
||||
SL => binary_op!(self, as_u64, ops::Shl::shl),
|
||||
SR => binary_op!(self, as_u64, ops::Shr::shr),
|
||||
SRS => binary_op!(self, as_i64, ops::Shr::shr),
|
||||
CMP => {
|
||||
let ParamBBB(tg, a0, a1) = param!(self, ParamBBB);
|
||||
self.write_reg(
|
||||
tg,
|
||||
(self.read_reg(a0).as_i64().cmp(&self.read_reg(a1).as_i64()) as i64)
|
||||
.into(),
|
||||
);
|
||||
}
|
||||
CMPU => {
|
||||
let ParamBBB(tg, a0, a1) = param!(self, ParamBBB);
|
||||
self.write_reg(
|
||||
tg,
|
||||
(self.read_reg(a0).as_u64().cmp(&self.read_reg(a1).as_u64()) as i64)
|
||||
.into(),
|
||||
);
|
||||
}
|
||||
NOT => {
|
||||
let param = param!(self, ParamBB);
|
||||
self.write_reg(param.0, (!self.read_reg(param.1).as_u64()).into());
|
||||
}
|
||||
NEG => {
|
||||
let param = param!(self, ParamBB);
|
||||
self.write_reg(
|
||||
param.0,
|
||||
match self.read_reg(param.1).as_u64() {
|
||||
0 => 1_u64,
|
||||
_ => 0,
|
||||
}
|
||||
.into(),
|
||||
);
|
||||
}
|
||||
DIR => {
|
||||
let ParamBBBB(dt, rt, a0, a1) = param!(self, ParamBBBB);
|
||||
let a0 = self.read_reg(a0).as_u64();
|
||||
let a1 = self.read_reg(a1).as_u64();
|
||||
self.write_reg(dt, (a0.checked_div(a1).unwrap_or(u64::MAX)).into());
|
||||
self.write_reg(rt, (a0.checked_rem(a1).unwrap_or(u64::MAX)).into());
|
||||
}
|
||||
ADDI => binary_op_imm!(self, as_u64, ops::Add::add),
|
||||
MULI => binary_op_imm!(self, as_u64, ops::Mul::mul),
|
||||
ANDI => binary_op_imm!(self, as_u64, ops::BitAnd::bitand),
|
||||
ORI => binary_op_imm!(self, as_u64, ops::BitOr::bitor),
|
||||
XORI => binary_op_imm!(self, as_u64, ops::BitXor::bitxor),
|
||||
SLI => binary_op_imm!(self, as_u64, ops::Shl::shl),
|
||||
SRI => binary_op_imm!(self, as_u64, ops::Shr::shr),
|
||||
SRSI => binary_op_imm!(self, as_i64, ops::Shr::shr),
|
||||
CMPI => {
|
||||
let ParamBBD(tg, a0, imm) = param!(self, ParamBBD);
|
||||
self.write_reg(
|
||||
tg,
|
||||
(self.read_reg(a0).as_i64().cmp(&Value::from(imm).as_i64()) as i64)
|
||||
.into(),
|
||||
);
|
||||
}
|
||||
CMPUI => {
|
||||
let ParamBBD(tg, a0, imm) = param!(self, ParamBBD);
|
||||
self.write_reg(tg, (self.read_reg(a0).as_u64().cmp(&imm) as i64).into());
|
||||
}
|
||||
CP => {
|
||||
let param = param!(self, ParamBB);
|
||||
self.write_reg(param.0, self.read_reg(param.1));
|
||||
}
|
||||
SWA => {
|
||||
let ParamBB(src, dst) = param!(self, ParamBB);
|
||||
if src + dst != 0 {
|
||||
core::ptr::swap(
|
||||
self.registers.get_unchecked_mut(usize::from(src)),
|
||||
self.registers.get_unchecked_mut(usize::from(dst)),
|
||||
);
|
||||
}
|
||||
}
|
||||
LI => {
|
||||
let param = param!(self, ParamBD);
|
||||
self.write_reg(param.0, param.1.into());
|
||||
}
|
||||
LD => {
|
||||
let ParamBBDH(dst, base, off, count) = param!(self, ParamBBDH);
|
||||
let n: usize = match dst {
|
||||
0 => 1,
|
||||
_ => 0,
|
||||
};
|
||||
|
||||
if let Err(e) = self.memory.load(
|
||||
self.read_reg(base).as_u64() + off + n as u64,
|
||||
self.registers.as_mut_ptr().add(usize::from(dst) + n).cast(),
|
||||
usize::from(count).saturating_sub(n),
|
||||
) {
|
||||
return HaltReason::LoadAccessEx(e);
|
||||
}
|
||||
}
|
||||
ST => {
|
||||
let ParamBBDH(dst, base, off, count) = param!(self, ParamBBDH);
|
||||
if let Err(e) = self.memory.store(
|
||||
self.read_reg(base).as_u64() + off,
|
||||
self.registers.as_ptr().add(usize::from(dst)).cast(),
|
||||
count.into(),
|
||||
) {
|
||||
return HaltReason::StoreAccessEx(e);
|
||||
}
|
||||
}
|
||||
BMC => {
|
||||
let ParamBBD(src, dst, count) = param!(self, ParamBBD);
|
||||
if self
|
||||
.memory
|
||||
.block_copy(
|
||||
self.read_reg(src).as_u64(),
|
||||
self.read_reg(dst).as_u64(),
|
||||
count,
|
||||
)
|
||||
.is_err()
|
||||
{
|
||||
todo!("Block memory copy fault");
|
||||
}
|
||||
}
|
||||
BRC => {
|
||||
let ParamBBB(src, dst, count) = param!(self, ParamBBB);
|
||||
core::ptr::copy(
|
||||
self.registers.get_unchecked(usize::from(src)),
|
||||
self.registers.get_unchecked_mut(usize::from(dst)),
|
||||
usize::from(count * 8),
|
||||
);
|
||||
}
|
||||
JMP => {
|
||||
let ParamBD(reg, offset) = param!(self, ParamBD);
|
||||
self.pc = (self.read_reg(reg).as_u64() + offset) as usize;
|
||||
}
|
||||
JEQ => cond_jump!(self, int, Equal),
|
||||
JNE => {
|
||||
let ParamBBD(a0, a1, jt) = param!(self, ParamBBD);
|
||||
if self.read_reg(a0).as_u64() != self.read_reg(a1).as_u64() {
|
||||
self.pc = jt as usize;
|
||||
}
|
||||
}
|
||||
JLT => cond_jump!(self, int, Less),
|
||||
JGT => cond_jump!(self, int, Greater),
|
||||
JLTU => cond_jump!(self, sint, Less),
|
||||
JGTU => cond_jump!(self, sint, Greater),
|
||||
ECALL => {
|
||||
param!(self, ());
|
||||
return HaltReason::Ecall;
|
||||
}
|
||||
ADDF => binary_op!(self, as_f64, ops::Add::add),
|
||||
MULF => binary_op!(self, as_f64, ops::Mul::mul),
|
||||
DIRF => {
|
||||
let ParamBBBB(dt, rt, a0, a1) = param!(self, ParamBBBB);
|
||||
let a0 = self.read_reg(a0).as_f64();
|
||||
let a1 = self.read_reg(a1).as_f64();
|
||||
self.write_reg(dt, (a0 / a1).into());
|
||||
self.write_reg(rt, (a0 % a1).into());
|
||||
}
|
||||
ADDFI => binary_op_imm!(self, as_f64, ops::Add::add),
|
||||
MULFI => binary_op_imm!(self, as_f64, ops::Mul::mul),
|
||||
op => return HaltReason::InvalidOpEx(op),
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn read_reg(&self, n: u8) -> Value {
|
||||
if n == 0 {
|
||||
0_u64.into()
|
||||
} else {
|
||||
*self.registers.get_unchecked(n as usize)
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn write_reg(&mut self, n: u8, value: Value) {
|
||||
if n != 0 {
|
||||
*self.registers.get_unchecked_mut(n as usize) = value;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
|
||||
#[repr(u8)]
|
||||
pub enum HaltReason {
|
||||
ProgramEnd,
|
||||
Ecall,
|
||||
InvalidOpEx(u8),
|
||||
LoadAccessEx(AccessFault),
|
||||
StoreAccessEx(AccessFault),
|
||||
}
|
||||
37
hbvm/src/vm/value.rs
Normal file
37
hbvm/src/vm/value.rs
Normal file
|
|
@ -0,0 +1,37 @@
|
|||
use core::fmt::Debug;
|
||||
|
||||
macro_rules! value_def {
|
||||
($($ty:ident),* $(,)?) => {
|
||||
#[derive(Copy, Clone)]
|
||||
#[repr(packed)]
|
||||
pub union Value {
|
||||
$(pub $ty: $ty),*
|
||||
}
|
||||
|
||||
paste::paste! {
|
||||
impl Value {$(
|
||||
#[inline]
|
||||
pub fn [<as_ $ty>](&self) -> $ty {
|
||||
unsafe { self.$ty }
|
||||
}
|
||||
)*}
|
||||
}
|
||||
|
||||
$(
|
||||
impl From<$ty> for Value {
|
||||
#[inline]
|
||||
fn from(value: $ty) -> Self {
|
||||
Self { $ty: value }
|
||||
}
|
||||
}
|
||||
)*
|
||||
};
|
||||
}
|
||||
|
||||
value_def!(u64, i64, f64);
|
||||
|
||||
impl Debug for Value {
|
||||
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
|
||||
self.as_u64().fmt(f)
|
||||
}
|
||||
}
|
||||
|
|
@ -1,409 +0,0 @@
|
|||
//! Welcome to the land of The Great Dispatch Loop
|
||||
//!
|
||||
//! Have fun
|
||||
|
||||
use crate::mem::Address;
|
||||
|
||||
use {
|
||||
super::{
|
||||
bmc::BlockCopier,
|
||||
mem::Memory,
|
||||
value::{Value, ValueVariant},
|
||||
Vm, VmRunError, VmRunOk,
|
||||
},
|
||||
core::{cmp::Ordering, mem::size_of, ops},
|
||||
hbbytecode::{
|
||||
ParamBB, ParamBBB, ParamBBBB, ParamBBD, ParamBBDH, ParamBBW, ParamBD, ProgramVal,
|
||||
},
|
||||
};
|
||||
|
||||
impl<Mem, const TIMER_QUOTIENT: usize> Vm<Mem, TIMER_QUOTIENT>
|
||||
where
|
||||
Mem: Memory,
|
||||
{
|
||||
/// Execute program
|
||||
///
|
||||
/// Program can return [`VmRunError`] if a trap handling failed
|
||||
#[cfg_attr(feature = "nightly", repr(align(4096)))]
|
||||
pub fn run(&mut self) -> Result<VmRunOk, VmRunError> {
|
||||
use hbbytecode::opcode::*;
|
||||
loop {
|
||||
// Big match
|
||||
//
|
||||
// Contribution guide:
|
||||
// - Zero register shall never be overwitten. It's value has to always be 0.
|
||||
// - Prefer `Self::read_reg` and `Self::write_reg` functions
|
||||
// - Extract parameters using `param!` macro
|
||||
// - Prioritise speed over code size
|
||||
// - Memory is cheap, CPUs not that much
|
||||
// - Do not heap allocate at any cost
|
||||
// - Yes, user-provided trap handler may allocate,
|
||||
// but that is not our »fault«.
|
||||
// - Unsafe is kinda must, but be sure you have validated everything
|
||||
// - Your contributions have to pass sanitizers and Miri
|
||||
// - Strictly follow the spec
|
||||
// - The spec does not specify how you perform actions, in what order,
|
||||
// just that the observable effects have to be performed in order and
|
||||
// correctly.
|
||||
// - Yes, we assume you run 64 bit CPU. Else ?conradluget a better CPU
|
||||
// sorry 8 bit fans, HBVM won't run on your Speccy :(
|
||||
unsafe {
|
||||
match self
|
||||
.memory
|
||||
.prog_read::<u8>(self.pc as _)
|
||||
.ok_or(VmRunError::ProgramFetchLoadEx(self.pc as _))?
|
||||
{
|
||||
UN => {
|
||||
self.decode::<()>();
|
||||
return Err(VmRunError::Unreachable);
|
||||
}
|
||||
TX => {
|
||||
self.decode::<()>();
|
||||
return Ok(VmRunOk::End);
|
||||
}
|
||||
NOP => self.decode::<()>(),
|
||||
ADD => self.binary_op(u64::wrapping_add),
|
||||
SUB => self.binary_op(u64::wrapping_sub),
|
||||
MUL => self.binary_op(u64::wrapping_mul),
|
||||
AND => self.binary_op::<u64>(ops::BitAnd::bitand),
|
||||
OR => self.binary_op::<u64>(ops::BitOr::bitor),
|
||||
XOR => self.binary_op::<u64>(ops::BitXor::bitxor),
|
||||
SL => self.binary_op(|l, r| u64::wrapping_shl(l, r as u32)),
|
||||
SR => self.binary_op(|l, r| u64::wrapping_shr(l, r as u32)),
|
||||
SRS => self.binary_op(|l, r| i64::wrapping_shl(l, r as u32)),
|
||||
CMP => {
|
||||
// Compare a0 <=> a1
|
||||
// < → 0
|
||||
// > → 1
|
||||
// = → 2
|
||||
|
||||
let ParamBBB(tg, a0, a1) = self.decode();
|
||||
self.write_reg(
|
||||
tg,
|
||||
self.read_reg(a0)
|
||||
.cast::<i64>()
|
||||
.cmp(&self.read_reg(a1).cast::<i64>())
|
||||
as i64
|
||||
+ 1,
|
||||
);
|
||||
}
|
||||
CMPU => {
|
||||
// Unsigned comparsion
|
||||
let ParamBBB(tg, a0, a1) = self.decode();
|
||||
self.write_reg(
|
||||
tg,
|
||||
self.read_reg(a0)
|
||||
.cast::<u64>()
|
||||
.cmp(&self.read_reg(a1).cast::<u64>())
|
||||
as i64
|
||||
+ 1,
|
||||
);
|
||||
}
|
||||
NOT => {
|
||||
// Logical negation
|
||||
let ParamBB(tg, a0) = self.decode();
|
||||
self.write_reg(tg, !self.read_reg(a0).cast::<u64>());
|
||||
}
|
||||
NEG => {
|
||||
// Bitwise negation
|
||||
let ParamBB(tg, a0) = self.decode();
|
||||
self.write_reg(
|
||||
tg,
|
||||
match self.read_reg(a0).cast::<u64>() {
|
||||
0 => 1_u64,
|
||||
_ => 0,
|
||||
},
|
||||
);
|
||||
}
|
||||
DIR => {
|
||||
// Fused Division-Remainder
|
||||
let ParamBBBB(dt, rt, a0, a1) = self.decode();
|
||||
let a0 = self.read_reg(a0).cast::<u64>();
|
||||
let a1 = self.read_reg(a1).cast::<u64>();
|
||||
self.write_reg(dt, a0.checked_div(a1).unwrap_or(u64::MAX));
|
||||
self.write_reg(rt, a0.checked_rem(a1).unwrap_or(u64::MAX));
|
||||
}
|
||||
ADDI => self.binary_op_imm(u64::wrapping_add),
|
||||
MULI => self.binary_op_imm(u64::wrapping_sub),
|
||||
ANDI => self.binary_op_imm::<u64>(ops::BitAnd::bitand),
|
||||
ORI => self.binary_op_imm::<u64>(ops::BitOr::bitor),
|
||||
XORI => self.binary_op_imm::<u64>(ops::BitXor::bitxor),
|
||||
SLI => self.binary_op_ims(u64::wrapping_shl),
|
||||
SRI => self.binary_op_ims(u64::wrapping_shr),
|
||||
SRSI => self.binary_op_ims(i64::wrapping_shr),
|
||||
CMPI => {
|
||||
let ParamBBD(tg, a0, imm) = self.decode();
|
||||
self.write_reg(
|
||||
tg,
|
||||
self.read_reg(a0)
|
||||
.cast::<i64>()
|
||||
.cmp(&Value::from(imm).cast::<i64>())
|
||||
as i64,
|
||||
);
|
||||
}
|
||||
CMPUI => {
|
||||
let ParamBBD(tg, a0, imm) = self.decode();
|
||||
self.write_reg(tg, self.read_reg(a0).cast::<u64>().cmp(&imm) as i64);
|
||||
}
|
||||
CP => {
|
||||
let ParamBB(tg, a0) = self.decode();
|
||||
self.write_reg(tg, self.read_reg(a0));
|
||||
}
|
||||
SWA => {
|
||||
// Swap registers
|
||||
let ParamBB(r0, r1) = self.decode();
|
||||
match (r0, r1) {
|
||||
(0, 0) => (),
|
||||
(dst, 0) | (0, dst) => self.write_reg(dst, 0_u64),
|
||||
(r0, r1) => {
|
||||
core::ptr::swap(
|
||||
self.registers.get_unchecked_mut(usize::from(r0)),
|
||||
self.registers.get_unchecked_mut(usize::from(r1)),
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
LI => {
|
||||
let ParamBD(tg, imm) = self.decode();
|
||||
self.write_reg(tg, imm);
|
||||
}
|
||||
LD => {
|
||||
// Load. If loading more than register size, continue on adjecent registers
|
||||
let ParamBBDH(dst, base, off, count) = self.decode();
|
||||
let n: u8 = match dst {
|
||||
0 => 1,
|
||||
_ => 0,
|
||||
};
|
||||
|
||||
self.memory.load(
|
||||
self.ldst_addr_uber(dst, base, off, count, n)?,
|
||||
self.registers
|
||||
.as_mut_ptr()
|
||||
.add(usize::from(dst) + usize::from(n))
|
||||
.cast(),
|
||||
usize::from(count).saturating_sub(n.into()),
|
||||
)?;
|
||||
}
|
||||
ST => {
|
||||
// Store. Same rules apply as to LD
|
||||
let ParamBBDH(dst, base, off, count) = self.decode();
|
||||
self.memory.store(
|
||||
self.ldst_addr_uber(dst, base, off, count, 0)?,
|
||||
self.registers.as_ptr().add(usize::from(dst)).cast(),
|
||||
count.into(),
|
||||
)?;
|
||||
}
|
||||
BMC => {
|
||||
// Block memory copy
|
||||
match if let Some(copier) = &mut self.copier {
|
||||
// There is some copier, poll.
|
||||
copier.poll(&mut self.memory)
|
||||
} else {
|
||||
// There is none, make one!
|
||||
let ParamBBD(src, dst, count) = self.decode();
|
||||
|
||||
// So we are still on BMC on next cycle
|
||||
self.pc -= size_of::<ParamBBD>() + 1;
|
||||
|
||||
self.copier = Some(BlockCopier::new(
|
||||
Address::new(self.read_reg(src).cast()),
|
||||
Address::new(self.read_reg(dst).cast()),
|
||||
count as _,
|
||||
));
|
||||
|
||||
self.copier
|
||||
.as_mut()
|
||||
.unwrap_unchecked() // SAFETY: We just assigned there
|
||||
.poll(&mut self.memory)
|
||||
} {
|
||||
// We are done, shift program counter
|
||||
core::task::Poll::Ready(Ok(())) => {
|
||||
self.copier = None;
|
||||
self.pc += size_of::<ParamBBD>() + 1;
|
||||
}
|
||||
// Error, shift program counter (for consistency)
|
||||
// and yield error
|
||||
core::task::Poll::Ready(Err(e)) => {
|
||||
self.pc += size_of::<ParamBBD>() + 1;
|
||||
return Err(e.into());
|
||||
}
|
||||
// Not done yet, proceed to next cycle
|
||||
core::task::Poll::Pending => (),
|
||||
}
|
||||
}
|
||||
BRC => {
|
||||
// Block register copy
|
||||
let ParamBBB(src, dst, count) = self.decode();
|
||||
if src.checked_add(count).is_none() || dst.checked_add(count).is_none() {
|
||||
return Err(VmRunError::RegOutOfBounds);
|
||||
}
|
||||
|
||||
core::ptr::copy(
|
||||
self.registers.get_unchecked(usize::from(src)),
|
||||
self.registers.get_unchecked_mut(usize::from(dst)),
|
||||
usize::from(count),
|
||||
);
|
||||
}
|
||||
JAL => {
|
||||
// Jump and link. Save PC after this instruction to
|
||||
// specified register and jump to reg + offset.
|
||||
let ParamBBD(save, reg, offset) = self.decode();
|
||||
self.write_reg(save, self.pc.get());
|
||||
self.pc =
|
||||
Address::new(self.read_reg(reg).cast::<u64>().saturating_add(offset));
|
||||
}
|
||||
// Conditional jumps, jump only to immediates
|
||||
JEQ => self.cond_jmp::<u64>(Ordering::Equal),
|
||||
JNE => {
|
||||
let ParamBBD(a0, a1, jt) = self.decode();
|
||||
if self.read_reg(a0).cast::<u64>() != self.read_reg(a1).cast::<u64>() {
|
||||
self.pc = Address::new(jt);
|
||||
}
|
||||
}
|
||||
JLT => self.cond_jmp::<u64>(Ordering::Less),
|
||||
JGT => self.cond_jmp::<u64>(Ordering::Greater),
|
||||
JLTU => self.cond_jmp::<i64>(Ordering::Less),
|
||||
JGTU => self.cond_jmp::<i64>(Ordering::Greater),
|
||||
ECALL => {
|
||||
self.decode::<()>();
|
||||
|
||||
// So we don't get timer interrupt after ECALL
|
||||
if TIMER_QUOTIENT != 0 {
|
||||
self.timer = self.timer.wrapping_add(1);
|
||||
}
|
||||
return Ok(VmRunOk::Ecall);
|
||||
}
|
||||
ADDF => self.binary_op::<f64>(ops::Add::add),
|
||||
SUBF => self.binary_op::<f64>(ops::Sub::sub),
|
||||
MULF => self.binary_op::<f64>(ops::Mul::mul),
|
||||
DIRF => {
|
||||
let ParamBBBB(dt, rt, a0, a1) = self.decode();
|
||||
let a0 = self.read_reg(a0).cast::<f64>();
|
||||
let a1 = self.read_reg(a1).cast::<f64>();
|
||||
self.write_reg(dt, a0 / a1);
|
||||
self.write_reg(rt, a0 % a1);
|
||||
}
|
||||
FMAF => {
|
||||
let ParamBBBB(dt, a0, a1, a2) = self.decode();
|
||||
self.write_reg(
|
||||
dt,
|
||||
self.read_reg(a0).cast::<f64>() * self.read_reg(a1).cast::<f64>()
|
||||
+ self.read_reg(a2).cast::<f64>(),
|
||||
);
|
||||
}
|
||||
NEGF => {
|
||||
let ParamBB(dt, a0) = self.decode();
|
||||
self.write_reg(dt, -self.read_reg(a0).cast::<f64>());
|
||||
}
|
||||
ITF => {
|
||||
let ParamBB(dt, a0) = self.decode();
|
||||
self.write_reg(dt, self.read_reg(a0).cast::<i64>() as f64);
|
||||
}
|
||||
FTI => {
|
||||
let ParamBB(dt, a0) = self.decode();
|
||||
self.write_reg(dt, self.read_reg(a0).cast::<f64>() as i64);
|
||||
}
|
||||
ADDFI => self.binary_op_imm::<f64>(ops::Add::add),
|
||||
MULFI => self.binary_op_imm::<f64>(ops::Mul::mul),
|
||||
op => return Err(VmRunError::InvalidOpcode(op)),
|
||||
}
|
||||
}
|
||||
|
||||
if TIMER_QUOTIENT != 0 {
|
||||
self.timer = self.timer.wrapping_add(1);
|
||||
if self.timer % TIMER_QUOTIENT == 0 {
|
||||
return Ok(VmRunOk::Timer);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Decode instruction operands
|
||||
#[inline(always)]
|
||||
unsafe fn decode<T: ProgramVal>(&mut self) -> T {
|
||||
let pc1 = self.pc + 1_u64;
|
||||
let data = self.memory.prog_read_unchecked::<T>(pc1 as _);
|
||||
self.pc += 1 + size_of::<T>();
|
||||
data
|
||||
}
|
||||
|
||||
/// Perform binary operating over two registers
|
||||
#[inline(always)]
|
||||
unsafe fn binary_op<T: ValueVariant>(&mut self, op: impl Fn(T, T) -> T) {
|
||||
let ParamBBB(tg, a0, a1) = self.decode();
|
||||
self.write_reg(
|
||||
tg,
|
||||
op(self.read_reg(a0).cast::<T>(), self.read_reg(a1).cast::<T>()),
|
||||
);
|
||||
}
|
||||
|
||||
/// Perform binary operation over register and immediate
|
||||
#[inline(always)]
|
||||
unsafe fn binary_op_imm<T: ValueVariant>(&mut self, op: impl Fn(T, T) -> T) {
|
||||
let ParamBBD(tg, reg, imm) = self.decode();
|
||||
self.write_reg(
|
||||
tg,
|
||||
op(self.read_reg(reg).cast::<T>(), Value::from(imm).cast::<T>()),
|
||||
);
|
||||
}
|
||||
|
||||
/// Perform binary operation over register and shift immediate
|
||||
#[inline(always)]
|
||||
unsafe fn binary_op_ims<T: ValueVariant>(&mut self, op: impl Fn(T, u32) -> T) {
|
||||
let ParamBBW(tg, reg, imm) = self.decode();
|
||||
self.write_reg(tg, op(self.read_reg(reg).cast::<T>(), imm));
|
||||
}
|
||||
|
||||
/// Jump at `#3` if ordering on `#0 <=> #1` is equal to expected
|
||||
#[inline(always)]
|
||||
unsafe fn cond_jmp<T: ValueVariant + Ord>(&mut self, expected: Ordering) {
|
||||
let ParamBBD(a0, a1, ja) = self.decode();
|
||||
if self
|
||||
.read_reg(a0)
|
||||
.cast::<T>()
|
||||
.cmp(&self.read_reg(a1).cast::<T>())
|
||||
== expected
|
||||
{
|
||||
self.pc = Address::new(ja);
|
||||
}
|
||||
}
|
||||
|
||||
/// Read register
|
||||
#[inline(always)]
|
||||
unsafe fn read_reg(&self, n: u8) -> Value {
|
||||
*self.registers.get_unchecked(n as usize)
|
||||
}
|
||||
|
||||
/// Write a register.
|
||||
/// Writing to register 0 is no-op.
|
||||
#[inline(always)]
|
||||
unsafe fn write_reg(&mut self, n: u8, value: impl Into<Value>) {
|
||||
if n != 0 {
|
||||
*self.registers.get_unchecked_mut(n as usize) = value.into();
|
||||
}
|
||||
}
|
||||
|
||||
/// Load / Store Address check-computation überfunction
|
||||
#[inline(always)]
|
||||
unsafe fn ldst_addr_uber(
|
||||
&self,
|
||||
dst: u8,
|
||||
base: u8,
|
||||
offset: u64,
|
||||
size: u16,
|
||||
adder: u8,
|
||||
) -> Result<Address, VmRunError> {
|
||||
let reg = dst.checked_add(adder).ok_or(VmRunError::RegOutOfBounds)?;
|
||||
|
||||
if usize::from(reg) * 8 + usize::from(size) > 2048 {
|
||||
Err(VmRunError::RegOutOfBounds)
|
||||
} else {
|
||||
self.read_reg(base)
|
||||
.cast::<u64>()
|
||||
.checked_add(offset)
|
||||
.and_then(|x| x.checked_add(adder.into()))
|
||||
.ok_or(VmRunError::AddrOutOfBounds)
|
||||
.map(Address::new)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1 +0,0 @@
|
|||
nightly
|
||||
|
|
@ -1,4 +1,3 @@
|
|||
hex_literal_case = "Upper"
|
||||
imports_granularity = "One"
|
||||
struct_field_align_threshold = 8
|
||||
enum_discrim_align_threshold = 8
|
||||
struct_field_align_threshold = 5
|
||||
|
|
|
|||
165
spec.md
165
spec.md
|
|
@ -1,11 +1,9 @@
|
|||
# HoleyBytes ISA Specification
|
||||
|
||||
# Bytecode format
|
||||
- Holey Bytes program should start with following magic: `[0xAB, 0x1E, 0x0B]`
|
||||
- All numbers are encoded little-endian
|
||||
- There is 256 registers, they are represented by a byte
|
||||
- Immediate values are 64 bit
|
||||
- Program is by spec required to be terminated with 12 zero bytes
|
||||
|
||||
### Instruction encoding
|
||||
- Instruction parameters are packed (no alignment)
|
||||
|
|
@ -21,8 +19,8 @@
|
|||
| BBBB | 32 bits |
|
||||
| BBB | 24 bits |
|
||||
| BBDH | 96 bits |
|
||||
| BBDB | 88 bits |
|
||||
| BBD | 80 bits |
|
||||
| BBW | 48 bits |
|
||||
| BB | 16 bits |
|
||||
| BD | 72 bits |
|
||||
| D | 64 bits |
|
||||
|
|
@ -34,14 +32,12 @@
|
|||
- `P ← V`: Set register P to value V
|
||||
- `[x]`: Address x
|
||||
|
||||
## Program execution control
|
||||
## No-op
|
||||
- N type
|
||||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:-----------------------------:|
|
||||
| 0 | UN | Trigger unreachable code trap |
|
||||
| 1 | TX | Terminate execution |
|
||||
| 2 | NOP | Do nothing |
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:----------:|
|
||||
| 0 | NOP | Do nothing |
|
||||
|
||||
## Integer binary ops.
|
||||
- BBB type
|
||||
|
|
@ -49,28 +45,28 @@
|
|||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:-----------------------:|
|
||||
| 3 | ADD | Wrapping addition |
|
||||
| 4 | SUB | Wrapping subtraction |
|
||||
| 5 | MUL | Wrapping multiplication |
|
||||
| 6 | AND | Bitand |
|
||||
| 7 | OR | Bitor |
|
||||
| 8 | XOR | Bitxor |
|
||||
| 9 | SL | Unsigned left bitshift |
|
||||
| 10 | SR | Unsigned right bitshift |
|
||||
| 11 | SRS | Signed right bitshift |
|
||||
| 1 | ADD | Wrapping addition |
|
||||
| 2 | SUB | Wrapping subtraction |
|
||||
| 3 | MUL | Wrapping multiplication |
|
||||
| 4 | AND | Bitand |
|
||||
| 5 | OR | Bitor |
|
||||
| 6 | XOR | Bitxor |
|
||||
| 7 | SL | Unsigned left bitshift |
|
||||
| 8 | SR | Unsigned right bitshift |
|
||||
| 9 | SRS | Signed right bitshift |
|
||||
|
||||
### Comparsion
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:-------------------:|
|
||||
| 12 | CMP | Signed comparsion |
|
||||
| 13 | CMPU | Unsigned comparsion |
|
||||
| 10 | CMP | Signed comparsion |
|
||||
| 11 | CMPU | Unsigned comparsion |
|
||||
|
||||
#### Comparsion table
|
||||
| #1 *op* #2 | Result |
|
||||
|:----------:|:------:|
|
||||
| < | 0 |
|
||||
| = | 1 |
|
||||
| > | 2 |
|
||||
| < | -1 |
|
||||
| = | 0 |
|
||||
| > | 1 |
|
||||
|
||||
### Division-remainder
|
||||
- Type BBBB
|
||||
|
|
@ -80,7 +76,7 @@
|
|||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:-------------------------------:|
|
||||
| 14 | DIR | Divide and remainder combinated |
|
||||
| 12 | DIR | Divide and remainder combinated |
|
||||
|
||||
### Negations
|
||||
- Type BB
|
||||
|
|
@ -88,36 +84,31 @@
|
|||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:----------------:|
|
||||
| 15 | NEG | Bit negation |
|
||||
| 16 | NOT | Logical negation |
|
||||
| 13 | NEG | Bit negation |
|
||||
| 14 | NOT | Logical negation |
|
||||
|
||||
## Integer immediate binary ops.
|
||||
- Type BBD
|
||||
- `#0 ← #1 <op> imm #2`
|
||||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:--------------------:|
|
||||
| 17 | ADDI | Wrapping addition |
|
||||
| 18 | MULI | Wrapping subtraction |
|
||||
| 19 | ANDI | Bitand |
|
||||
| 20 | ORI | Bitor |
|
||||
| 21 | XORI | Bitxor |
|
||||
|
||||
### Bitshifts
|
||||
- Type BBW
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:-----------------------:|
|
||||
| 22 | SLI | Unsigned left bitshift |
|
||||
| 23 | SRI | Unsigned right bitshift |
|
||||
| 24 | SRSI | Signed right bitshift |
|
||||
| 15 | ADDI | Wrapping addition |
|
||||
| 16 | MULI | Wrapping subtraction |
|
||||
| 17 | ANDI | Bitand |
|
||||
| 18 | ORI | Bitor |
|
||||
| 19 | XORI | Bitxor |
|
||||
| 20 | SLI | Unsigned left bitshift |
|
||||
| 21 | SRI | Unsigned right bitshift |
|
||||
| 22 | SRSI | Signed right bitshift |
|
||||
|
||||
### Comparsion
|
||||
- Comparsion is the same as when RRR type
|
||||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:-----:|:-------------------:|
|
||||
| 25 | CMPI | Signed comparsion |
|
||||
| 26 | CMPUI | Unsigned comparsion |
|
||||
| 23 | CMPI | Signed comparsion |
|
||||
| 24 | CMPUI | Unsigned comparsion |
|
||||
|
||||
## Register value set / copy
|
||||
|
||||
|
|
@ -127,18 +118,15 @@
|
|||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:------:|
|
||||
| 27 | CP | Copy |
|
||||
| 25 | CP | Copy |
|
||||
|
||||
### Swap
|
||||
- Type BB
|
||||
- Swap #0 and #1
|
||||
- Zero register rules:
|
||||
- Both: no-op
|
||||
- One: Copy zero to the non-zero register
|
||||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:------:|
|
||||
| 28 | SWA | Swap |
|
||||
| 26 | SWA | Swap |
|
||||
|
||||
### Load immediate
|
||||
- Type BD
|
||||
|
|
@ -146,7 +134,7 @@
|
|||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:--------------:|
|
||||
| 29 | LI | Load immediate |
|
||||
| 27 | LI | Load immediate |
|
||||
|
||||
## Memory operations
|
||||
- Type BBDH
|
||||
|
|
@ -155,8 +143,8 @@
|
|||
### Load / Store
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:---------------------------------------:|
|
||||
| 30 | LD | `#0 ← [#1 + imm #3], copy imm #4 bytes` |
|
||||
| 31 | ST | `[#1 + imm #3] ← #0, copy imm #4 bytes` |
|
||||
| 28 | LD | `#0 ← [#1 + imm #3], copy imm #4 bytes` |
|
||||
| 29 | ST | `[#1 + imm #3] ← #0, copy imm #4 bytes` |
|
||||
|
||||
## Block copy
|
||||
- Block copy source and target can overlap
|
||||
|
|
@ -166,7 +154,7 @@
|
|||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:--------------------------------:|
|
||||
| 32 | BMC | `[#1] ← [#0], copy imm #2 bytes` |
|
||||
| 30 | BMC | `[#0] ← [#1], copy imm #2 bytes` |
|
||||
|
||||
### Register copy
|
||||
- Type BBB
|
||||
|
|
@ -174,22 +162,16 @@
|
|||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:--------------------------------:|
|
||||
| 33 | BRC | `#1 ← #0, copy imm #2 registers` |
|
||||
| 31 | BRC | `#0 ← #1, copy imm #2 registers` |
|
||||
|
||||
## Control flow
|
||||
|
||||
### Unconditional jump
|
||||
- Type D
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:-------------------------------:|
|
||||
| 34 | JMP | Unconditional, non-linking jump |
|
||||
- Type BD
|
||||
|
||||
### Unconditional linking jump
|
||||
- Type BBD
|
||||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:--------------------------------------------------:|
|
||||
| 35 | JAL | Save PC past JAL to `#0` and jump at `#1 + imm #2` |
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:---------------------:|
|
||||
| 32 | JMP | Jump at `#0 + imm #1` |
|
||||
|
||||
### Conditional jumps
|
||||
- Type BBD
|
||||
|
|
@ -197,19 +179,19 @@
|
|||
|
||||
| Opcode | Name | Comparsion |
|
||||
|:------:|:----:|:------------:|
|
||||
| 36 | JEQ | = |
|
||||
| 37 | JNE | ≠ |
|
||||
| 38 | JLT | < (signed) |
|
||||
| 39 | JGT | > (signed) |
|
||||
| 40 | JLTU | < (unsigned) |
|
||||
| 41 | JGTU | > (unsigned) |
|
||||
| 33 | JEQ | = |
|
||||
| 34 | JNE | ≠ |
|
||||
| 35 | JLT | < (signed) |
|
||||
| 36 | JGT | > (signed) |
|
||||
| 37 | JLTU | < (unsigned) |
|
||||
| 38 | JGTU | > (unsigned) |
|
||||
|
||||
### Environment call
|
||||
- Type N
|
||||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:-----:|:-------------------------------------:|
|
||||
| 42 | ECALL | Cause an trap to the host environment |
|
||||
| 39 | ECALL | Cause an trap to the host environment |
|
||||
|
||||
## Floating point operations
|
||||
- Type BBB
|
||||
|
|
@ -217,39 +199,15 @@
|
|||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:--------------:|
|
||||
| 43 | ADDF | Addition |
|
||||
| 44 | SUBF | Subtraction |
|
||||
| 45 | MULF | Multiplication |
|
||||
| 40 | ADDF | Addition |
|
||||
| 41 | MULF | Multiplication |
|
||||
|
||||
### Division-remainder
|
||||
- Type BBBB
|
||||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:-------------------------:|
|
||||
| 46 | DIRF | Same as for integer `DIR` |
|
||||
|
||||
### Fused Multiply-Add
|
||||
- Type BBBB
|
||||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:---------------------:|
|
||||
| 47 | FMAF | `#0 ← (#1 * #2) + #3` |
|
||||
|
||||
### Negation
|
||||
- Type BB
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:----------:|
|
||||
| 48 | NEGF | `#0 ← -#1` |
|
||||
|
||||
### Conversion
|
||||
- Type BB
|
||||
- Signed
|
||||
- `#0 ← #1 as _`
|
||||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:------------:|
|
||||
| 49 | ITF | Int to Float |
|
||||
| 50 | FTI | Float to Int |
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:----:|:--------------------------------------:|
|
||||
| 42 | DIRF | Same flow applies as for integer `DIR` |
|
||||
|
||||
## Floating point immediate operations
|
||||
- Type BBD
|
||||
|
|
@ -257,8 +215,8 @@
|
|||
|
||||
| Opcode | Name | Action |
|
||||
|:------:|:-----:|:--------------:|
|
||||
| 51 | ADDFI | Addition |
|
||||
| 52 | MULFI | Multiplication |
|
||||
| 43 | ADDFI | Addition |
|
||||
| 44 | MULFI | Multiplication |
|
||||
|
||||
# Registers
|
||||
- There is 255 registers + one zero register (with index 0)
|
||||
|
|
@ -267,23 +225,21 @@
|
|||
|
||||
# Memory
|
||||
- Addresses are 64 bit
|
||||
- Program should be in the same address space as all other data
|
||||
- Memory implementation is arbitrary
|
||||
- Address `0x0` may or may not be valid. Count with compilers
|
||||
considering it invalid!
|
||||
- In case of accessing invalid address:
|
||||
- Program shall trap (LoadAccessEx, StoreAccessEx) with parameter of accessed address
|
||||
- Value of register when trapped is undefined
|
||||
|
||||
## Recommendations
|
||||
- Leave address `0x0` as invalid
|
||||
- If paging used:
|
||||
- Leave first page invalid
|
||||
- Pages should be at least 4 KiB
|
||||
|
||||
# Program execution
|
||||
- The way of program execution is implementation defined
|
||||
- The execution is arbitrary, as long all effects are obervable
|
||||
in the way as program was executed literally, in order.
|
||||
- The order of instruction is arbitrary, as long all observable
|
||||
effects are applied in the program's order
|
||||
|
||||
# Program validation
|
||||
- Invalid program should cause runtime error:
|
||||
|
|
@ -298,7 +254,6 @@ Program should at least implement these traps:
|
|||
- Invalid instruction exception
|
||||
- Load address exception
|
||||
- Store address exception
|
||||
- Unreachable instruction
|
||||
|
||||
and executing environment should be able to get information about them,
|
||||
like the opcode of invalid instruction or attempted address to load/store.
|
||||
|
|
|
|||
Loading…
Reference in a new issue