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22 changes: 9 additions & 13 deletions src/hyperlight_host/src/hypervisor/hyperlight_vm.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1039,41 +1039,37 @@ mod debug {
// Must be idempotent!
fn add_sw_breakpoint(
&mut self,
addr: u64,
gva: u64,
mem_access: &DebugMemoryAccess,
) -> crate::Result<()> {
let addr = self.vm.translate_gva(addr)?;

// Check if breakpoint already exists
if self.sw_breakpoints.contains_key(&addr) {
if self.sw_breakpoints.contains_key(&gva) {
return Ok(());
}

// Write breakpoint OP code to write to guest memory
let mut save_data = [0; SW_BP_SIZE];
self.read_addrs(addr, &mut save_data[..], mem_access)?;
self.write_addrs(addr, &SW_BP, mem_access)?;
self.read_addrs(gva, &mut save_data[..], mem_access)?;
self.write_addrs(gva, &SW_BP, mem_access)?;

// Save guest memory to restore when breakpoint is removed
self.sw_breakpoints.insert(addr, save_data[0]);
self.sw_breakpoints.insert(gva, save_data[0]);

Ok(())
}

fn remove_sw_breakpoint(
&mut self,
addr: u64,
gva: u64,
mem_access: &DebugMemoryAccess,
) -> crate::Result<()> {
let addr = self.vm.translate_gva(addr)?;

if let Some(saved_data) = self.sw_breakpoints.remove(&addr) {
if let Some(saved_data) = self.sw_breakpoints.remove(&gva) {
// Restore saved data to the guest's memory
self.write_addrs(addr, &[saved_data], mem_access)?;
self.write_addrs(gva, &[saved_data], mem_access)?;

Ok(())
} else {
Err(new_error!("The address: {:?} is not a sw breakpoint", addr))
Err(new_error!("The address: {:?} is not a sw breakpoint", gva))
}
}
}
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