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KVM: x86 emulator: Add unary mul, imul, div, and idiv instructions 

This adds unary mul, imul, div, and idiv instructions (group 3 r/m 4-7).

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Mohammed Gamal 2010-08-08 21:11:37 +03:00 committed by Avi Kivity
parent ba7ff2b76d
commit 3f9f53b0d5
1 changed files with 40 additions and 1 deletions
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41
arch/x86/kvm/emulate.c
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@ -315,6 +315,31 @@ struct group_dual {
} \
} while (0)
#define __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, _suffix) \
do { \
unsigned long _tmp; \
\
__asm__ __volatile__ ( \
_PRE_EFLAGS("0", "4", "1") \
_op _suffix " %5; " \
_POST_EFLAGS("0", "4", "1") \
: "=m" (_eflags), "=&r" (_tmp), \
"+a" (_rax), "+d" (_rdx) \
: "i" (EFLAGS_MASK), "m" ((_src).val), \
"a" (_rax), "d" (_rdx)); \
} while (0)
/* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */
#define emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags) \
do { \
switch((_src).bytes) { \
case 1: __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "b"); break; \
case 2: __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "w"); break; \
case 4: __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "l"); break; \
case 8: ON64(__emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "q")); break; \
} \
} while (0)
/* Fetch next part of the instruction being emulated. */
#define insn_fetch(_type, _size, _eip) \
({ unsigned long _x; \
@ -1373,6 +1398,8 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
unsigned long *rax = &c->regs[VCPU_REGS_RAX];
unsigned long *rdx = &c->regs[VCPU_REGS_RDX];
switch (c->modrm_reg) {
case 0 ... 1: /* test */
@ -1384,6 +1411,18 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
case 3: /* neg */
emulate_1op("neg", c->dst, ctxt->eflags);
break;
case 4: /* mul */
emulate_1op_rax_rdx("mul", c->src, *rax, *rdx, ctxt->eflags);
break;
case 5: /* imul */
emulate_1op_rax_rdx("imul", c->src, *rax, *rdx, ctxt->eflags);
break;
case 6: /* div */
emulate_1op_rax_rdx("div", c->src, *rax, *rdx, ctxt->eflags);
break;
case 7: /* idiv */
emulate_1op_rax_rdx("idiv", c->src, *rax, *rdx, ctxt->eflags);
break;
default:
return 0;
}
@ -2138,7 +2177,7 @@ static struct opcode group1A[] = {
static struct opcode group3[] = {
D(DstMem | SrcImm | ModRM), D(DstMem | SrcImm | ModRM),
D(DstMem | SrcNone | ModRM | Lock), D(DstMem | SrcNone | ModRM | Lock),
X4(D(Undefined)),
X4(D(SrcMem | ModRM)),
};
static struct opcode group4[] = {