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Merge pull request 'merge' (#1) from AbleOS/holey-bytes:master into master

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Reviewed-on: https://git.ablecorp.us/bee/holey-bytes/pulls/1
This commit is contained in:
bee 2023-07-12 17:13:38 +00:00
parent 373f729452 6a03ba9b7b
commit abdce1a873
6 changed files with 42 additions and 22 deletions
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4
hbasm/src/lib.rs
View file

@ -21,11 +21,11 @@ macros::impl_both!(
=> [LD, ST],
bbd(p0: R, p1: R, p2: I)
=> [ADDI, MULI, ANDI, ORI, XORI, SLI, SRI, SRSI, CMPI, CMPUI,
BMC, JEQ, JNE, JLT, JGT, JLTU, JGTU, ADDFI, MULFI],
BMC, JAL, JEQ, JNE, JLT, JGT, JLTU, JGTU, ADDFI, MULFI],
bb(p0: R, p1: R)
=> [NEG, NOT, CP, SWA, NEGF, ITF, FTI],
bd(p0: R, p1: I)
=> [LI, JMP],
=> [LI],
n()
=> [NOP, ECALL],
);

2
hbbytecode/src/lib.rs
View file

@ -54,7 +54,7 @@ constmod!(pub opcode(u8) {
BMC = 30, "BBD; [#0] ← [#1], imm #2 bytes";
BRC = 31, "BBB; #0 ← #1, imm #2 registers";
JMP = 32, "BD; Unconditional jump [#0 + imm #1]";
JAL = 32, "BD; Copy PC to #0 and unconditional jump [#1 + imm #2]";
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";

4
hbvm/src/validate.rs
View file

@ -50,8 +50,8 @@ pub fn validate(mut program: &[u8]) -> Result<(), Error> {
| [DIR | DIRF, _, _, _, _, rest @ ..]
| [ADD..=CMPU | BRC | ADDF..=MULF, _, _, _, rest @ ..]
| [NEG..=NOT | CP..=SWA | NEGF..=FTI, _, _, rest @ ..]
| [LI | JMP, _, _, _, _, _, _, _, _, _, rest @ ..]
| [ADDI..=CMPUI | BMC | JEQ..=JGTU | ADDFI..=MULFI, _, _, _, _, _, _, _, _, _, _, rest @ ..]
| [LI, _, _, _, _, _, _, _, _, _, rest @ ..]
| [ADDI..=CMPUI | BMC | JAL..=JGTU | ADDFI..=MULFI, _, _, _, _, _, _, _, _, _, _, rest @ ..]
| [LD..=ST, _, _, _, _, _, _, _, _, _, _, _, _, rest @ ..] => rest,
_ => {
return Err(Error {

41
hbvm/src/vm/mem/mod.rs
View file

@ -64,6 +64,25 @@ impl Memory {
}
}
/// Maps host's memory into VM's memory
///
/// # Safety
/// Who knows.
pub unsafe fn map(
&mut self,
mut host: *mut u8,
target: usize,
pagesize: PageSize,
count: usize,
) {
todo!()
}
/// Unmaps pages from VM's memory
pub fn unmap(&mut self, addr: usize, count: usize) {
todo!()
}
/// Load value from an address
///
/// # Safety
@ -215,11 +234,11 @@ impl Memory {
action: fn(*mut u8, *mut u8, usize),
traph: &mut impl HandlePageFault,
) -> Result<(), u64> {
let mut pspl = AddrSplitter::new(src, len, self.root_pt);
let mut pspl = AddrPageLookuper::new(src, len, self.root_pt);
loop {
match pspl.next() {
// Page found
Some(Ok(AddrSplitOk {
Some(Ok(AddrPageLookupOk {
vaddr,
ptr,
size,
@ -233,7 +252,7 @@ impl Memory {
action(ptr, dst, size);
dst = unsafe { dst.add(size) };
}
Some(Err(AddrSplitError { addr, size })) => {
Some(Err(AddrPageLookupError { addr, size })) => {
// Execute page fault handler
if traph.page_fault(reason, self, addr, size, dst) {
// Shift the splitter address
@ -252,7 +271,7 @@ impl Memory {
}
/// Result from address split
struct AddrSplitOk {
struct AddrPageLookupOk {
/// Virtual address
vaddr: u64,
@ -266,7 +285,7 @@ struct AddrSplitOk {
perm: Permission,
}
struct AddrSplitError {
struct AddrPageLookupError {
/// Address of failure
addr: u64,
@ -275,7 +294,7 @@ struct AddrSplitError {
}
/// Address splitter into pages
struct AddrSplitter {
struct AddrPageLookuper {
/// Current address
addr: u64,
@ -286,7 +305,7 @@ struct AddrSplitter {
pagetable: *const PageTable,
}
impl AddrSplitter {
impl AddrPageLookuper {
/// Create a new page splitter
pub const fn new(addr: u64, size: usize, pagetable: *const PageTable) -> Self {
Self {
@ -303,8 +322,8 @@ impl AddrSplitter {
}
}
impl Iterator for AddrSplitter {
type Item = Result<AddrSplitOk, AddrSplitError>;
impl Iterator for AddrPageLookuper {
type Item = Result<AddrPageLookupOk, AddrPageLookupError>;
fn next(&mut self) -> Option<Self::Item> {
// The end, everything is fine
@ -328,7 +347,7 @@ impl Iterator for AddrSplitter {
match entry.permission() {
// No page → page fault
Permission::Empty => {
return Some(Err(AddrSplitError {
return Some(Err(AddrPageLookupError {
addr: self.addr,
size: PageSize::from_lvl(lvl)?,
}))
@ -358,7 +377,7 @@ impl Iterator for AddrSplitter {
let avail = (size as usize - offset).clamp(0, self.size);
self.bump(size);
Some(Ok(AddrSplitOk {
Some(Ok(AddrPageLookupOk {
vaddr: self.addr,
ptr: unsafe { base.add(offset) }, // Return pointer to the start of region
size: avail,

5
hbvm/src/vm/mod.rs
View file

@ -259,8 +259,9 @@ impl<'a, PfHandler: HandlePageFault, const TIMER_QUOTIENT: usize>
usize::from(count),
);
}
JMP => {
let ParamBD(reg, offset) = param!(self, ParamBD);
JAL => {
let ParamBBD(save, reg, offset) = param!(self, ParamBBD);
self.write_reg(save, self.pc as u64);
self.pc = (self.read_reg(reg).as_u64() + offset) as usize;
}
JEQ => cond_jump!(self, int, Equal),

6
spec.md
View file

@ -166,11 +166,11 @@
## Control flow
### Unconditional jump
- Type BD
- Type BBD
| Opcode | Name | Action |
|:------:|:----:|:---------------------:|
| 32 | JMP | Jump at `#0 + imm #1` |
|:------:|:----:|:-------------------------------------------------:|
| 32 | JAL | Save current PC to `#0` and jump at `#1 + imm #2` |
### Conditional jumps
- Type BBD