Author: tychon
Date: Tue Apr 15 15:11:10 2014
New Revision: 264501
URL: http://svnweb.freebsd.org/changeset/base/264501
Log:
Add support for emulating the byte move and sign extend instructions:
"movsx r/m8, r32" and "movsx r/m8, r64".
Approved by: grehan (co-mentor)
Modified:
head/sys/amd64/vmm/vmm_instruction_emul.c
Modified: head/sys/amd64/vmm/vmm_instruction_emul.c
==============================================================================
--- head/sys/amd64/vmm/vmm_instruction_emul.c Tue Apr 15 14:55:56 2014
(r264500)
+++ head/sys/amd64/vmm/vmm_instruction_emul.c Tue Apr 15 15:11:10 2014
(r264501)
@@ -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_opco
.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
* - 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;
@@ -368,6 +373,32 @@ emulate_movzx(void *vm, int vcpuid, uint
/* 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;
default:
break;
}
@@ -508,9 +539,10 @@ vmm_emulate_instruction(void *vm, int vc
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,
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