KVM: emulator: check rex prefix inside decode_register()
All decode_register() callers check if instruction has rex prefix to properly decode one byte operand. It make sense to move the check inside. Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
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95f328d3ad
Коммит
aa9ac1a632
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@ -785,9 +785,10 @@ static int do_insn_fetch(struct x86_emulate_ctxt *ctxt,
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* @highbyte_regs specifies whether to decode AH,CH,DH,BH.
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*/
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static void *decode_register(struct x86_emulate_ctxt *ctxt, u8 modrm_reg,
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int highbyte_regs)
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int byteop)
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{
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void *p;
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int highbyte_regs = (ctxt->rex_prefix == 0) && byteop;
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if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8)
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p = (unsigned char *)reg_rmw(ctxt, modrm_reg & 3) + 1;
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@ -1024,7 +1025,6 @@ static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
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struct operand *op)
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{
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unsigned reg = ctxt->modrm_reg;
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int highbyte_regs = ctxt->rex_prefix == 0;
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if (!(ctxt->d & ModRM))
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reg = (ctxt->b & 7) | ((ctxt->rex_prefix & 1) << 3);
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@ -1046,10 +1046,10 @@ static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
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op->type = OP_REG;
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if (ctxt->d & ByteOp) {
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op->addr.reg = decode_register(ctxt, reg, highbyte_regs);
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op->addr.reg = decode_register(ctxt, reg, true);
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op->bytes = 1;
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} else {
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op->addr.reg = decode_register(ctxt, reg, 0);
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op->addr.reg = decode_register(ctxt, reg, false);
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op->bytes = ctxt->op_bytes;
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}
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fetch_register_operand(op);
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@ -1082,12 +1082,10 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
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ctxt->modrm_seg = VCPU_SREG_DS;
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if (ctxt->modrm_mod == 3) {
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int highbyte_regs = ctxt->rex_prefix == 0;
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op->type = OP_REG;
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op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
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op->addr.reg = decode_register(ctxt, ctxt->modrm_rm,
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highbyte_regs && (ctxt->d & ByteOp));
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ctxt->d & ByteOp);
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if (ctxt->d & Sse) {
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op->type = OP_XMM;
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op->bytes = 16;
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@ -4117,10 +4115,8 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
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case OpMem8:
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ctxt->memop.bytes = 1;
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if (ctxt->memop.type == OP_REG) {
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int highbyte_regs = ctxt->rex_prefix == 0;
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ctxt->memop.addr.reg = decode_register(ctxt, ctxt->modrm_rm,
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highbyte_regs);
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ctxt->memop.addr.reg = decode_register(ctxt,
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ctxt->modrm_rm, true);
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fetch_register_operand(&ctxt->memop);
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}
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goto mem_common;
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