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Emulate the "OR reg, r/m" instruction (opcode 0BH).

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This is	needed for the HDA emulation with FreeBSD guests.

Reviewed by:	marcelo
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D12832
This commit is contained in:
Peter Grehan 2017-11-01 03:26:53 +00:00
parent 7561a31ed9
commit 9d210a4a18
1 changed files with 31 additions and 1 deletions
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32
sys/amd64/vmm/vmm_instruction_emul.c
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@ -109,6 +109,10 @@ static const struct vie_op one_byte_opcodes[256] = {
.op_byte = 0x0F,
.op_type = VIE_OP_TYPE_TWO_BYTE
},
[0x0B] = {
.op_byte = 0x0B,
.op_type = VIE_OP_TYPE_OR,
},
[0x2B] = {
.op_byte = 0x2B,
.op_type = VIE_OP_TYPE_SUB,
@ -992,12 +996,38 @@ emulate_or(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;
uint64_t val1, result, rflags, rflags2;
enum vm_reg_name reg;
uint64_t result, rflags, rflags2, val1, val2;
size = vie->opsize;
error = EINVAL;
switch (vie->op.op_byte) {
case 0x0B:
/*
* OR reg (ModRM:reg) and mem (ModRM:r/m) and store the
* result in reg.
*
* 0b/r or r16, r/m16
* 0b/r or r32, r/m32
* REX.W + 0b/r or r64, r/m64
*/
/* get the first operand */
reg = gpr_map[vie->reg];
error = vie_read_register(vm, vcpuid, reg, &val1);
if (error)
break;
/* get the second operand */
error = memread(vm, vcpuid, gpa, &val2, size, arg);
if (error)
break;
/* perform the operation and write the result */
result = val1 | val2;
error = vie_update_register(vm, vcpuid, reg, result, size);
break;
case 0x81:
case 0x83:
/*