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hypervisor: emulator: Decoding loop restructuring

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In preparation for the instruction fetching step, we modify the decoding
loop so that we can check what the last decoding error is.

We also switch to explictly using decode_out() which removes a 32 bytes
copy compared to decode().

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2020-11-26 11:16:53 +01:00 committed by Rob Bradford
parent 7a4edecd29
commit 7dc92d1dac
1 changed files with 10 additions and 2 deletions
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12
hypervisor/src/arch/x86/emulator/mod.rs
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@ -513,9 +513,15 @@ impl<'a, T: CpuStateManager> Emulator<'a, T> {
.cpu_state(cpu_id)
.map_err(EmulationError::PlatformEmulationError)?;
let mut decoder = Decoder::new(64, insn_stream, DecoderOptions::NONE);
let mut insn = Instruction::default();
let mut num_insn_emulated: usize = 0;
decoder.set_ip(state.ip());
for (index, insn) in &mut decoder.iter().enumerate() {
while decoder.can_decode() {
decoder.decode_out(&mut insn);
// Emulate the decoded instruction
self.insn_map
.instructions
.get(&insn.code())
@ -524,8 +530,10 @@ impl<'a, T: CpuStateManager> Emulator<'a, T> {
})?
.emulate(&insn, &mut state, self.platform)?;
num_insn_emulated += 1;
if let Some(num_insn) = num_insn {
if index + 1 >= num_insn {
if num_insn_emulated >= num_insn {
// Exit the decoding loop, do not decode the next instruction.
break;
}