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hypervisor: x86: emulate MOVSB
Signed-off-by: Praveen K Paladugu <prapal@linux.microsoft.com>
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3a225aaa23
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@ -95,6 +95,11 @@ impl<T: CpuStateManager> InstructionHandler<T> for Movsw_m16_m16 {
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movs!(u16);
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}
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pub struct Movsb_m8_m8;
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impl<T: CpuStateManager> InstructionHandler<T> for Movsb_m8_m8 {
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movs!(u8);
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}
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#[cfg(test)]
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mod tests {
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#![allow(unused_mut)]
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@ -215,4 +220,65 @@ mod tests {
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vmm.read_memory(0x8 + 8, &mut data).unwrap();
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assert_eq!(0x0, <u16>::from_le_bytes(data));
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}
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#[test]
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fn test_movsb_m8_m8() {
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let ip: u64 = 0x1000;
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let memory: [u8; 4] = [
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0x78, 0x56, 0x34, 0x12, // 0x12345678
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];
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let insn = [0x66, 0xa4]; // movsb
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let regs = vec![(Register::ESI, 0), (Register::EDI, 0x8)];
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let mut data = [0u8; 1];
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let mut vmm = MockVmm::new(ip, regs, Some((0, &memory)));
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assert!(vmm.emulate_first_insn(0, &insn).is_ok());
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vmm.read_memory(0x8, &mut data).unwrap();
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assert_eq!(0x78, data[0]);
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// Only one byte was copied, so the value at 0x9 should be zero
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vmm.read_memory(0x9, &mut data).unwrap();
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assert_eq!(0x0, data[0]);
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// The rest should be default value 0 from MockVmm
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vmm.read_memory(0x4, &mut data).unwrap();
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assert_eq!(0x0, data[0]);
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// the src value is left as is after movb
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vmm.read_memory(0x0, &mut data).unwrap();
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assert_eq!(0x78, data[0]);
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}
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#[test]
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fn test_rep_movsb_m8_m8() {
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let ip: u64 = 0x1000;
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let memory: [u8; 16] = [
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0x78, 0x56, 0x34, 0x12, // 0x12345678
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0xbb, 0xaa, 0x00, 0x00, // 0x0000aabb
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0x00, 0x00, 0x00, 0x00, // 0x00000000
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0x00, 0x00, 0x00, 0x00, // 0x00000000
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];
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let insn = [0x66, 0xf3, 0xa4]; // rep movsw
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let regs = vec![(Register::ECX, 6), (Register::ESI, 0), (Register::EDI, 0x8)];
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let mut data = [0u8; 1];
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let mut vmm = MockVmm::new(ip, regs, Some((0, &memory)));
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assert!(vmm.emulate_first_insn(0, &insn).is_ok());
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vmm.read_memory(0x8, &mut data).unwrap();
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assert_eq!(0x78, data[0]);
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vmm.read_memory(0x8 + 1, &mut data).unwrap();
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assert_eq!(0x56, data[0]);
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vmm.read_memory(0x8 + 2, &mut data).unwrap();
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assert_eq!(0x34, data[0]);
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vmm.read_memory(0x8 + 3, &mut data).unwrap();
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assert_eq!(0x12, data[0]);
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vmm.read_memory(0x8 + 4, &mut data).unwrap();
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assert_eq!(0xbb, data[0]);
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vmm.read_memory(0x8 + 5, &mut data).unwrap();
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assert_eq!(0xaa, data[0]);
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// The rest should be default value 0 from MockVmm
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vmm.read_memory(0x8 + 6, &mut data).unwrap();
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assert_eq!(0x0, data[0]);
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}
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}
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@ -527,6 +527,7 @@ impl<'a, T: CpuStateManager> Emulator<'a, T> {
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// MOVS
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(movs, Movsd_m32_m32),
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(movs, Movsw_m16_m16),
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(movs, Movsb_m8_m8),
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// OR
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(or, Or_rm8_r8)
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);
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