Commit 341de7e3 authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
Browse files

KVM: x86 emulator: Add unsigned byte immediate decode 



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

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent d53c4777

arch/x86/kvm/x86_emulate.c

+11 −6
Original line number Diff line number Diff line
@@ -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;

		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;