a

hbvm/src/main.rs

@@ -1,5 +1,5 @@
 use hbvm::vm::{
-    mem::{Memory, PageSize},
+    mem::{Memory, MemoryAccessReason, PageSize},
     trap::HandleTrap,
     value::Value,
 };
@@ -33,7 +33,14 @@ pub fn time() -> u32 {
 
 struct TestTrapHandler;
 impl HandleTrap for TestTrapHandler {
-    fn page_fault(&mut self, _: &mut Memory, _: u64, _: PageSize, _: *mut u8) -> bool {
+    fn page_fault(
+        &mut self,
+        _: MemoryAccessReason,
+        _: &mut Memory,
+        _: u64,
+        _: PageSize,
+        _: *mut u8,
+    ) -> bool {
         false
     }
 

hbvm/src/vm/mem/mod.rs

@@ -69,6 +69,7 @@ impl Memory {
         traph: &mut impl HandleTrap,
     ) -> Result<(), LoadError> {
         self.memory_access(
+            MemoryAccessReason::Load,
             addr,
             target,
             count,
@@ -96,6 +97,7 @@ impl Memory {
         traph: &mut impl HandleTrap,
     ) -> Result<(), StoreError> {
         self.memory_access(
+            MemoryAccessReason::Store,
             addr,
             source.cast_mut(),
             count,
@@ -118,7 +120,7 @@ impl Memory {
         dst: u64,
         count: usize,
         traph: &mut impl HandleTrap,
-    ) -> Result<(), BlkCopyError> {
+    ) -> Result<(), MemoryAccessReason> {
         // Yea, i know it is possible to do this more efficiently, but I am too lazy.
 
         const STACK_BUFFER_SIZE: usize = 512;
@@ -144,6 +146,7 @@ impl Memory {
         let status = (|| {
             // Load to buffer
             self.memory_access(
+                MemoryAccessReason::Load,
                 src,
                 buf,
                 count,
@@ -156,10 +159,11 @@ impl Memory {
                 |src, dst, count| core::ptr::copy(src, dst, count),
                 traph,
             )
-            .map_err(|_| BlkCopyError::Load)?;
+            .map_err(|_| MemoryAccessReason::Load)?;
 
             // Store from buffer
             self.memory_access(
+                MemoryAccessReason::Store,
                 dst,
                 buf,
                 count,
@@ -167,9 +171,9 @@ impl Memory {
                 |dst, src, count| core::ptr::copy(src, dst, count),
                 traph,
             )
-            .map_err(|_| BlkCopyError::Store)?;
+            .map_err(|_| MemoryAccessReason::Store)?;
 
-            Ok::<_, BlkCopyError>(())
+            Ok::<_, MemoryAccessReason>(())
         })();
 
         // Deallocate if used heap-allocated array
@@ -187,8 +191,10 @@ impl Memory {
     /// 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: u64,
         mut dst: *mut u8,
         len: usize,
@@ -211,7 +217,7 @@ impl Memory {
                 }
                 Some(Err(AddrSplitError { addr, size })) => {
                     // Execute page fault handler
-                    if traph.page_fault(self, addr, size, dst) {
+                    if traph.page_fault(reason, self, addr, size, dst) {
                         // Shift the splitter address
                         pspl.bump(size);
 
@@ -372,13 +378,21 @@ pub struct LoadError;
 #[derive(Clone, Copy, Display, Debug, PartialEq, Eq)]
 pub struct StoreError;
 
-/// Unhandled block transfer trap
 #[derive(Clone, Copy, Display, Debug, PartialEq, Eq)]
-pub enum BlkCopyError {
+pub enum MemoryAccessReason {
     Load,
     Store,
 }
 
+impl From<MemoryAccessReason> for VmRunError {
+    fn from(value: MemoryAccessReason) -> Self {
+        match value {
+            MemoryAccessReason::Load => Self::LoadAccessEx,
+            MemoryAccessReason::Store => Self::StoreAccessEx,
+        }
+    }
+}
+
 impl From<LoadError> for VmRunError {
     fn from(_: LoadError) -> Self {
         Self::LoadAccessEx
@@ -390,12 +404,3 @@ impl From<StoreError> for VmRunError {
         Self::StoreAccessEx
     }
 }
-
-impl From<BlkCopyError> for VmRunError {
-    fn from(value: BlkCopyError) -> Self {
-        match value {
-            BlkCopyError::Load => Self::LoadAccessEx,
-            BlkCopyError::Store => Self::StoreAccessEx,
-        }
-    }
-}

hbvm/src/vm/trap.rs

@@ -1,12 +1,19 @@
 use super::{
-    mem::{Memory, PageSize},
+    mem::{Memory, MemoryAccessReason, PageSize},
     value::Value,
 };
 
 /// Handle VM traps
 pub trait HandleTrap {
     /// Handle page fault
-    fn page_fault(&mut self, memory: &mut Memory, addr: u64, size: PageSize, dst: *mut u8) -> bool;
+    fn page_fault(
+        &mut self,
+        reason: MemoryAccessReason,
+        memory: &mut Memory,
+        vaddr: u64,
+        size: PageSize,
+        dataptr: *mut u8,
+    ) -> bool;
 
     /// Handle invalid opcode exception
     fn invalid_op(