[Qemu-devel] [RFC PATCH v4 26/75] target/i386: introduce M* (memptr) operands

[Jan Bobek]

The memory-pointer operand decodes the indirect form of ModR/M byte,
loads the effective address into a register and passes that register
as the operand.

Signed-off-by: Jan Bobek <address@hidden>
---
 target/i386/translate.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/target/i386/translate.c b/target/i386/translate.c
index 9f02ea58d1..46c41cc3be 100644
--- a/target/i386/translate.c
+++ b/target/i386/translate.c
@@ -4908,6 +4908,42 @@ INSNOP_FINALIZE(Ib)
 {
 }
 
+/*
+ * Memory-pointer operand
+ */
+typedef TCGv insnop_arg_t(M);
+typedef struct {} insnop_ctxt_t(M);
+
+INSNOP_INIT(M)
+{
+    bool ret;
+    insnop_ctxt_t(modrm_mod) modctxt;
+
+    ret = insnop_init(modrm_mod)(&modctxt, env, s, modrm, is_write);
+    if (ret) {
+        const int mod =
+            insnop_prepare(modrm_mod)(&modctxt, env, s, modrm, is_write);
+        ret = (mod != 3);
+        insnop_finalize(modrm_mod)(&modctxt, env, s, modrm, is_write, mod);
+    }
+    return ret;
+}
+INSNOP_PREPARE(M)
+{
+    gen_lea_modrm(env, s, modrm);
+    return s->A0;
+}
+INSNOP_FINALIZE(M)
+{
+}
+
+DEF_INSNOP_ALIAS(Mb, M)
+DEF_INSNOP_ALIAS(Mw, M)
+DEF_INSNOP_ALIAS(Md, M)
+DEF_INSNOP_ALIAS(Mq, M)
+DEF_INSNOP_ALIAS(Mdq, M)
+DEF_INSNOP_ALIAS(Mqq, M)
+
 static void gen_sse_ng(CPUX86State *env, DisasContext *s, int b)
 {
     enum {
-- 
2.20.1