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Add support for emulating the byte move instruction "mov r/m8, r8".

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This emulation is required when dumping MMIO space via the ddb "examine"
command.
This commit is contained in:
Neel Natu 2013-08-27 16:49:20 +00:00
parent 29c463d633
commit 6f6ebf3c3f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=254964
1 changed files with 10 additions and 2 deletions
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12
sys/amd64/vmm/vmm_instruction_emul.c
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@ -77,6 +77,10 @@ static const struct vie_op one_byte_opcodes[256] = {
.op_byte = 0x89,
.op_type = VIE_OP_TYPE_MOV,
},
[0x8A] = {
.op_byte = 0x8A,
.op_type = VIE_OP_TYPE_MOV,
},
[0x8B] = {
.op_byte = 0x8B,
.op_type = VIE_OP_TYPE_MOV,
@ -268,13 +272,18 @@ emulate_mov(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
error = memwrite(vm, vcpuid, gpa, val, size, arg);
}
break;
case 0x8A:
case 0x8B:
/*
* MOV from mem (ModRM:r/m) to reg (ModRM:reg)
* 8A/r: mov r/m8, r8
* REX + 8A/r: mov r/m8, r8
* 8B/r: mov r32, r/m32
* REX.W 8B/r: mov r64, r/m64
*/
if (vie->rex_w)
if (vie->op.op_byte == 0x8A)
size = 1;
else if (vie->rex_w)
size = 8;
error = memread(vm, vcpuid, gpa, &val, size, arg);
if (error == 0) {
@ -688,7 +697,6 @@ decode_modrm(struct vie *vie)
vie->base_register = VM_REG_GUEST_RIP;
else
vie->base_register = VM_REG_LAST;
}
break;
}