From 920474115c3182b19008598b0def86cb8fdf1318 Mon Sep 17 00:00:00 2001
From: Michael Matz <matz@suse.de>
Date: Thu, 30 Jun 2016 16:14:32 +0200
Subject: x86-64-asm: More opcodes

Implement some more opcodes, syscall, sysret, lfence, mfence, sfence.
---
 i386-asm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'i386-asm.c')

diff --git a/i386-asm.c b/i386-asm.c
index 2ffa53b..a036e49 100644
--- a/i386-asm.c
+++ b/i386-asm.c
@@ -893,6 +893,15 @@ ST_FUNC void asm_opcode(TCCState *s1, int opcode)
 
     pc = 0;
     if (pa->instr_type & OPC_MODRM) {
+	if (!nb_ops) {
+	    /* A modrm opcode without operands is a special case (e.g. mfence).
+	       It has a group and acts as if there's an register operand 0
+	       (ax).  */
+	    i = 0;
+	    ops[i].type = OP_REG;
+	    ops[i].reg = 0;
+	    goto modrm_found;
+	}
         /* first look for an ea operand */
         for(i = 0;i < nb_ops; i++) {
             if (op_type[i] & OP_EA)
-- 
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