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Commit e35b7b9c authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
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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: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 2d49ec72

arch/x86/kvm/emulate.c

+18 −0
Original line number Diff line number Diff line
@@ -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;