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hypervisor: x86: emulator: test executing only one instruction

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Signed-off-by: Wei Liu <liuwe@microsoft.com>
This commit is contained in:
Wei Liu 2024-06-27 22:17:50 +00:00 committed by Bo Chen
parent 19b0ea842b
commit 56c6c02724
1 changed files with 46 additions and 0 deletions
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46
hypervisor/src/arch/x86/emulator/mod.rs
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@ -840,6 +840,52 @@ mod tests {
assert_eq!(rbx, target_rax);
}
#[test]
// Emulate only one instruction.
//
// mov rax, 0x1000
// mov rbx, qword ptr [rax+10h]
// The emulation should stop after the first instruction.
fn test_emulate_one_instruction() {
let target_rax: u64 = 0x1000;
let ip: u64 = 0x1000;
let cpu_id = 0;
let memory = [
// Code at IP
0x48, 0xc7, 0xc0, 0x00, 0x10, 0x00, 0x00, // mov rax, 0x1000
0x48, 0x8b, 0x58, 0x10, // mov rbx, qword ptr [rax+10h]
// Padding
0x00, 0x00, 0x00, 0x00, 0x00, // Padding is all zeroes
// Data at IP + 0x10 (0x1234567812345678 in LE)
0x78, 0x56, 0x34, 0x12, 0x78, 0x56, 0x34, 0x12,
];
let insn = [
0x48, 0xc7, 0xc0, 0x00, 0x10, 0x00, 0x00, // mov rax, 0x1000
0x48, 0x8b, 0x58, 0x10, // mov rbx, qword ptr [rax+10h]
];
let mut vmm = MockVmm::new(ip, vec![], Some((ip, &memory)));
assert!(vmm.emulate_insn(cpu_id, &insn, Some(1)).is_ok());
let new_ip: u64 = vmm.cpu_state(cpu_id).unwrap().ip();
assert_eq!(new_ip, ip + 0x7 /* length of mov rax,0x1000 */);
let rax: u64 = vmm
.cpu_state(cpu_id)
.unwrap()
.read_reg(Register::RAX)
.unwrap();
assert_eq!(rax, target_rax);
// The second instruction is not executed so RBX should be zero.
let rbx: u64 = vmm
.cpu_state(cpu_id)
.unwrap()
.read_reg(Register::RBX)
.unwrap();
assert_eq!(rbx, 0);
}
#[test]
// Emulate truncated instruction stream, which should cause a fetch.
//