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KVM: x86 emulator: Add unsigned byte immediate decode

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Extend "Source operand type" opcode description field to 4 bites
to accommodate new option.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2009-04-12 13:36:41 +03:00 committed by Avi Kivity
parent d53c4777b3
commit 341de7e372
1 changed files with 11 additions and 6 deletions
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17
arch/x86/kvm/x86_emulate.c
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@ -59,13 +59,14 @@
#define SrcImm (5<<4) /* Immediate operand. */
#define SrcImmByte (6<<4) /* 8-bit sign-extended immediate operand. */
#define SrcOne (7<<4) /* Implied '1' */
#define SrcMask (7<<4)
#define SrcImmUByte (8<<4) /* 8-bit unsigned immediate operand. */
#define SrcMask (0xf<<4)
/* Generic ModRM decode. */
#define ModRM (1<<7)
#define ModRM (1<<8)
/* Destination is only written; never read. */
#define Mov (1<<8)
#define BitOp (1<<9)
#define MemAbs (1<<10) /* Memory operand is absolute displacement */
#define Mov (1<<9)
#define BitOp (1<<10)
#define MemAbs (1<<11) /* Memory operand is absolute displacement */
#define String (1<<12) /* String instruction (rep capable) */
#define Stack (1<<13) /* Stack instruction (push/pop) */
#define Group (1<<14) /* Bits 3:5 of modrm byte extend opcode */
@ -1044,10 +1045,14 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
}
break;
case SrcImmByte:
case SrcImmUByte:
c->src.type = OP_IMM;
c->src.ptr = (unsigned long *)c->eip;
c->src.bytes = 1;
c->src.val = insn_fetch(s8, 1, c->eip);
if ((c->d & SrcMask) == SrcImmByte)
c->src.val = insn_fetch(s8, 1, c->eip);
else
c->src.val = insn_fetch(u8, 1, c->eip);
break;
case SrcOne:
c->src.bytes = 1;