[Qemu-devel] [RFC PATCH v3 21/46] target/i386: introduce modrm operand

[Jan Bobek]

This permits the ModR/M byte to be passed raw into the code generator,
effectively allowing to short-circuit the operand decoding mechanism
and do the decoding work manually in the code generator.

Signed-off-by: Jan Bobek <address@hidden>
---
 target/i386/translate.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/target/i386/translate.c b/target/i386/translate.c
index 7fc5149d29..25c25a30fb 100644
--- a/target/i386/translate.c
+++ b/target/i386/translate.c
@@ -4740,6 +4740,26 @@ INSNOP_FINALIZE(tcg_temp_i64)
     tcg_temp_free_i64(arg);
 }
 
+/*
+ * modrm
+ *
+ * Operand whose value is the ModR/M byte.
+ */
+typedef int insnop_arg_t(modrm);
+typedef struct {} insnop_ctxt_t(modrm);
+
+INSNOP_INIT(modrm)
+{
+    return 0;
+}
+INSNOP_PREPARE(modrm)
+{
+    return modrm;
+}
+INSNOP_FINALIZE(modrm)
+{
+}
+
 static void gen_sse_ng(CPUX86State *env, DisasContext *s, int b)
 {
     enum {
-- 
2.20.1