diff options
| author | Gleb Natapov <gleb@redhat.com> | 2009-04-12 13:36:41 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-06-10 11:48:41 +0300 |
| commit | 341de7e3728ade102eaadf56af404f4ce865a73d (patch) | |
| tree | b849de0a8f174f72ba90cc31a35a3bf8752de035 /arch/x86/kvm/x86_emulate.c | |
| parent | d53c4777b3a3e5031710d0664851d1309325884b (diff) | |
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: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86_emulate.c')
| -rw-r--r-- | arch/x86/kvm/x86_emulate.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c index 4a9cd4c2b983..0988a13063dc 100644 --- a/arch/x86/kvm/x86_emulate.c +++ b/arch/x86/kvm/x86_emulate.c @@ -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 @@ done_prefixes: } 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; |