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STOS/STOSB/STOSW/STOSD/STOSQ instruction emulation.

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Reviewed by:	neel
This commit is contained in:
Tycho Nightingale 2015-04-25 19:02:06 +00:00
parent 0e5e31a6c6
commit 57f7026c0f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=281987
1 changed files with 77 additions and 0 deletions
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77
sys/amd64/vmm/vmm_instruction_emul.c
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@ -72,6 +72,7 @@ enum {
VIE_OP_TYPE_POP,
VIE_OP_TYPE_MOVS,
VIE_OP_TYPE_GROUP1,
VIE_OP_TYPE_STOS,
VIE_OP_TYPE_LAST
};
@ -146,6 +147,16 @@ static const struct vie_op one_byte_opcodes[256] = {
.op_type = VIE_OP_TYPE_MOVS,
.op_flags = VIE_OP_F_NO_MODRM | VIE_OP_F_NO_GLA_VERIFICATION
},
[0xAA] = {
.op_byte = 0xAA,
.op_type = VIE_OP_TYPE_STOS,
.op_flags = VIE_OP_F_NO_MODRM | VIE_OP_F_NO_GLA_VERIFICATION
},
[0xAB] = {
.op_byte = 0xAB,
.op_type = VIE_OP_TYPE_STOS,
.op_flags = VIE_OP_F_NO_MODRM | VIE_OP_F_NO_GLA_VERIFICATION
},
[0xC6] = {
/* XXX Group 11 extended opcode - not just MOV */
.op_byte = 0xC6,
@ -802,6 +813,68 @@ emulate_movs(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
return (0);
}
static int
emulate_stos(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
struct vm_guest_paging *paging, mem_region_read_t memread,
mem_region_write_t memwrite, void *arg)
{
int error, opsize, repeat;
uint64_t val;
uint64_t rcx, rdi, rflags;
opsize = (vie->op.op_byte == 0xAA) ? 1 : vie->opsize;
repeat = vie->repz_present | vie->repnz_present;
if (repeat) {
error = vie_read_register(vm, vcpuid, VM_REG_GUEST_RCX, &rcx);
KASSERT(!error, ("%s: error %d getting rcx", __func__, error));
/*
* The count register is %rcx, %ecx or %cx depending on the
* address size of the instruction.
*/
if ((rcx & vie_size2mask(vie->addrsize)) == 0)
return (0);
}
error = vie_read_register(vm, vcpuid, VM_REG_GUEST_RAX, &val);
KASSERT(!error, ("%s: error %d getting rax", __func__, error));
error = memwrite(vm, vcpuid, gpa, val, opsize, arg);
if (error)
return (error);
error = vie_read_register(vm, vcpuid, VM_REG_GUEST_RDI, &rdi);
KASSERT(error == 0, ("%s: error %d getting rdi", __func__, error));
error = vie_read_register(vm, vcpuid, VM_REG_GUEST_RFLAGS, &rflags);
KASSERT(error == 0, ("%s: error %d getting rflags", __func__, error));
if (rflags & PSL_D)
rdi -= opsize;
else
rdi += opsize;
error = vie_update_register(vm, vcpuid, VM_REG_GUEST_RDI, rdi,
vie->addrsize);
KASSERT(error == 0, ("%s: error %d updating rdi", __func__, error));
if (repeat) {
rcx = rcx - 1;
error = vie_update_register(vm, vcpuid, VM_REG_GUEST_RCX,
rcx, vie->addrsize);
KASSERT(!error, ("%s: error %d updating rcx", __func__, error));
/*
* Repeat the instruction if the count register is not zero.
*/
if ((rcx & vie_size2mask(vie->addrsize)) != 0)
vm_restart_instruction(vm, vcpuid);
}
return (0);
}
static int
emulate_and(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
mem_region_read_t memread, mem_region_write_t memwrite, void *arg)
@ -1302,6 +1375,10 @@ vmm_emulate_instruction(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
error = emulate_movs(vm, vcpuid, gpa, vie, paging, memread,
memwrite, memarg);
break;
case VIE_OP_TYPE_STOS:
error = emulate_stos(vm, vcpuid, gpa, vie, paging, memread,
memwrite, memarg);
break;
case VIE_OP_TYPE_AND:
error = emulate_and(vm, vcpuid, gpa, vie,
memread, memwrite, memarg);