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KVM: x86 emulator: Add pusha and popa instructions 

This adds pusha and popa instructions (opcodes 0x60-0x61), this enables booting
MINIX with invalid guest state emulation on.

[marcelo: remove unused variable]

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Mohammed Gamal 2009-09-01 15:28:11 +02:00 committed by Avi Kivity
parent 94677e61fd
commit abcf14b560
1 changed files with 47 additions and 1 deletions
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48
arch/x86/kvm/emulate.c
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@ -139,7 +139,8 @@ static u32 opcode_table[256] = {
DstReg | Stack, DstReg | Stack, DstReg | Stack, DstReg | Stack,
DstReg | Stack, DstReg | Stack, DstReg | Stack, DstReg | Stack,
/* 0x60 - 0x67 */
0, 0, 0, DstReg | SrcMem32 | ModRM | Mov /* movsxd (x86/64) */ ,
ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
0, DstReg | SrcMem32 | ModRM | Mov /* movsxd (x86/64) */ ,
0, 0, 0, 0,
/* 0x68 - 0x6F */
SrcImm | Mov | Stack, 0, SrcImmByte | Mov | Stack, 0,
@ -1225,6 +1226,43 @@ static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt,
return rc;
}
static void emulate_pusha(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
unsigned long old_esp = c->regs[VCPU_REGS_RSP];
int reg = VCPU_REGS_RAX;
while (reg <= VCPU_REGS_RDI) {
(reg == VCPU_REGS_RSP) ?
(c->src.val = old_esp) : (c->src.val = c->regs[reg]);
emulate_push(ctxt);
++reg;
}
}
static int emulate_popa(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
int rc = 0;
int reg = VCPU_REGS_RDI;
while (reg >= VCPU_REGS_RAX) {
if (reg == VCPU_REGS_RSP) {
register_address_increment(c, &c->regs[VCPU_REGS_RSP],
c->op_bytes);
--reg;
}
rc = emulate_pop(ctxt, ops, &c->regs[reg], c->op_bytes);
if (rc != 0)
break;
--reg;
}
return rc;
}
static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
@ -1816,6 +1854,14 @@ special_insn:
if (rc != 0)
goto done;
break;
case 0x60: /* pusha */
emulate_pusha(ctxt);
break;
case 0x61: /* popa */
rc = emulate_popa(ctxt, ops);
if (rc != 0)
goto done;
break;
case 0x63: /* movsxd */
if (ctxt->mode != X86EMUL_MODE_PROT64)
goto cannot_emulate;