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KVM: x86 emulator: Add decoding of 16bit second in memory argument 

Add decoding of Ep type of argument used by callf/jmpf.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2010-02-25 16:36:42 +02:00 committed by Avi Kivity
parent 2d49ec72d3
commit e35b7b9c9e
1 changed files with 18 additions and 0 deletions
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18
arch/x86/kvm/emulate.c
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@ -85,6 +85,9 @@
#define Src2ImmByte (2<<29)
#define Src2One (3<<29)
#define Src2Imm16 (4<<29)
#define Src2Mem16 (5<<29) /* Used for Ep encoding. First argument has to be
in memory and second argument is located
immediately after the first one in memory. */
#define Src2Mask (7<<29)
enum {
@ -1163,6 +1166,10 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
c->src2.bytes = 1;
c->src2.val = 1;
break;
case Src2Mem16:
c->src2.bytes = 2;
c->src2.type = OP_MEM;
break;
}
/* Decode and fetch the destination operand: register or memory. */
@ -1881,6 +1888,17 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
c->src.orig_val = c->src.val;
}
if (c->src2.type == OP_MEM) {
c->src2.ptr = (unsigned long *)(memop + c->src.bytes);
c->src2.val = 0;
rc = ops->read_emulated((unsigned long)c->src2.ptr,
&c->src2.val,
c->src2.bytes,
ctxt->vcpu);
if (rc != X86EMUL_CONTINUE)
goto done;
}
if ((c->d & DstMask) == ImplicitOps)
goto special_insn;