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Add support for emulating the byte move and sign extend instructions:

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"movsx r/m8, r32" and "movsx r/m8, r64".

Approved by:	grehan (co-mentor)
This commit is contained in:
tychon 2014-04-15 15:11:10 +00:00
parent 16b4ecc28d
commit 04f26f5235
1 changed files with 37 additions and 5 deletions
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42
sys/amd64/vmm/vmm_instruction_emul.c
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@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
enum {
VIE_OP_TYPE_NONE = 0,
VIE_OP_TYPE_MOV,
VIE_OP_TYPE_MOVSX,
VIE_OP_TYPE_MOVZX,
VIE_OP_TYPE_AND,
VIE_OP_TYPE_OR,
@ -69,6 +70,10 @@ static const struct vie_op two_byte_opcodes[256] = {
.op_byte = 0xB6,
.op_type = VIE_OP_TYPE_MOVZX,
},
[0xBE] = {
.op_byte = 0xBE,
.op_type = VIE_OP_TYPE_MOVSX,
},
};
static const struct vie_op one_byte_opcodes[256] = {
@ -333,9 +338,9 @@ emulate_mov(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
* - address size override is not supported
*/
static int
emulate_movzx(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
mem_region_read_t memread, mem_region_write_t memwrite,
void *arg)
emulate_movx(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
mem_region_read_t memread, mem_region_write_t memwrite,
void *arg)
{
int error, size;
enum vm_reg_name reg;
@ -365,6 +370,32 @@ emulate_movzx(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
if (vie->rex_w)
size = 8;
/* write the result */
error = vie_update_register(vm, vcpuid, reg, val, size);
break;
case 0xBE:
/*
* MOV and sign extend byte from mem (ModRM:r/m) to
* reg (ModRM:reg).
*
* 0F BE/r movsx r/m8, r32
* REX.W + 0F BE/r movsx r/m8, r64
*/
/* get the first operand */
error = memread(vm, vcpuid, gpa, &val, 1, arg);
if (error)
break;
/* get the second operand */
reg = gpr_map[vie->reg];
if (vie->rex_w)
size = 8;
/* sign extend byte */
val = (int8_t)val;
/* write the result */
error = vie_update_register(vm, vcpuid, reg, val, size);
break;
@ -508,9 +539,10 @@ vmm_emulate_instruction(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
error = emulate_mov(vm, vcpuid, gpa, vie,
memread, memwrite, memarg);
break;
case VIE_OP_TYPE_MOVSX:
case VIE_OP_TYPE_MOVZX:
error = emulate_movzx(vm, vcpuid, gpa, vie,
memread, memwrite, memarg);
error = emulate_movx(vm, vcpuid, gpa, vie,
memread, memwrite, memarg);
break;
case VIE_OP_TYPE_AND:
error = emulate_and(vm, vcpuid, gpa, vie,