Author: tychon
Date: Sat Apr 25 19:02:06 2015
New Revision: 281987
URL: https://svnweb.freebsd.org/changeset/base/281987
Log:
STOS/STOSB/STOSW/STOSD/STOSQ instruction emulation.
Reviewed by: neel
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 Sat Apr 25 18:17:08 2015
(r281986)
+++ head/sys/amd64/vmm/vmm_instruction_emul.c Sat Apr 25 19:02:06 2015
(r281987)
@@ -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_opco
.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,
@@ -803,6 +814,68 @@ done:
}
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 vc
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);
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