d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Properly screen for the AND 0x81 instruction from the set

Browse Source 
of group1 0x81 instructions that use the reg bits as an
extended opcode.

Still todo: properly update rflags.

Pointed out by:	jilles@
This commit is contained in:
Peter Grehan 2012-11-30 05:40:24 +00:00
parent b1f95796f0
commit e6f1f347a1
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
sys/amd64/vmm/vmm_instruction_emul.c
View File

@ -83,6 +83,7 @@ static const struct vie_op one_byte_opcodes[256] = {
.op_type = VIE_OP_TYPE_AND,
},
[0x81] = {
/* XXX Group 1 extended opcode - not just AND */
.op_byte = 0x81,
.op_type = VIE_OP_TYPE_AND,
.op_flags = VIE_OP_F_IMM,
@ -311,7 +312,13 @@ emulate_and(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
*
* 81/ and r/m32, imm32
* REX.W + 81/ and r/m64, imm32 sign-extended to 64
*
* Currently, only the AND operation of the 0x81 opcode
* is implemented (ModRM:reg = b100).
*/
if ((vie->reg & 7) != 4)
break;
if (vie->rex_w)
size = 8;