[06/25] target/i386: replace NoSeg special with NoLoadEA

Commit Message

Paolo Bonzini June 8, 2024, 8:40 a.m. UTC

This is a bit more generic, as it can be applied to MPX as well.

Signed-off-by: Paolo Bonzini <[e-mail]>
---
 target/i386/tcg/decode-new.h     |  5 +++--
 target/i386/tcg/decode-new.c.inc | 12 ++++--------
 target/i386/tcg/emit.c.inc       |  3 ++-
 3 files changed, 9 insertions(+), 11 deletions(-)

Comments

Richard Henderson June 8, 2024, 6:16 p.m. UTC | #1

On 6/8/24 01:40, Paolo Bonzini wrote:
> This is a bit more generic, as it can be applied to MPX as well.
> 
> Signed-off-by: Paolo Bonzini<[e-mail]>
> ---
>   target/i386/tcg/decode-new.h     |  5 +++--
>   target/i386/tcg/decode-new.c.inc | 12 ++++--------
>   target/i386/tcg/emit.c.inc       |  3 ++-
>   3 files changed, 9 insertions(+), 11 deletions(-)

Reviewed-by: Richard Henderson <[e-mail]>

r~

Patch

diff --git a/target/i386/tcg/decode-new.h b/target/i386/tcg/decode-new.h
index f704698575f..46a96b220d0 100644
--- a/target/i386/tcg/decode-new.h
+++ b/target/i386/tcg/decode-new.h
@@ -170,8 +170,9 @@  typedef enum X86InsnSpecial {
     /* Always locked if it has a memory operand (XCHG) */
     X86_SPECIAL_Locked,
 
-    /* Do not apply segment base to effective address */
-    X86_SPECIAL_NoSeg,
+    /* Do not load effective address in s->A0 */
+    X86_SPECIAL_NoLoadEA,
+
     /*
      * Rd/Mb or Rd/Mw in the manual: register operand 0 is treated as 32 bits
      * (and writeback zero-extends it to 64 bits if applicable).  PREFIX_DATA
diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc
index d41002e2f5c..4f5fcdb88dd 100644
--- a/target/i386/tcg/decode-new.c.inc
+++ b/target/i386/tcg/decode-new.c.inc
@@ -193,7 +193,7 @@ 
     X86_OP_ENTRY3(op, None, None, None, None, None, None, ## __VA_ARGS__)
 
 #define cpuid(feat) .cpuid = X86_FEAT_##feat,
-#define noseg .special = X86_SPECIAL_NoSeg,
+#define nolea .special = X86_SPECIAL_NoLoadEA,
 #define xchg .special = X86_SPECIAL_Locked,
 #define lock .special = X86_SPECIAL_HasLock,
 #define mmx .special = X86_SPECIAL_MMX,
@@ -1592,7 +1592,7 @@  static const X86OpEntry opcodes_root[256] = {
     [0x8B] = X86_OP_ENTRYwr(MOV, G,v, E,v),
      /* Missing in Table A-2: memory destination is always 16-bit.  */
     [0x8C] = X86_OP_ENTRYwr(MOV, E,v, S,w, op0_Mw),
-    [0x8D] = X86_OP_ENTRYwr(LEA, G,v, M,v, noseg),
+    [0x8D] = X86_OP_ENTRYwr(LEA, G,v, M,v, nolea),
     [0x8E] = X86_OP_ENTRYwr(MOV, S,w, E,w),
     [0x8F] = X86_OP_GROUPw(group1A, E,v),
 
@@ -2524,11 +2524,6 @@  static void disas_insn(DisasContext *s, CPUState *cpu)
         assert(decode.op[1].unit == X86_OP_INT);
         break;
 
-    case X86_SPECIAL_NoSeg:
-        decode.mem.def_seg = -1;
-        s->override = -1;
-        break;
-
     case X86_SPECIAL_Op0_Mw:
         assert(decode.op[0].unit == X86_OP_INT);
         if (decode.op[0].has_ea) {
@@ -2585,7 +2580,8 @@  static void disas_insn(DisasContext *s, CPUState *cpu)
         gen_helper_enter_mmx(tcg_env);
     }
 
-    if (decode.op[0].has_ea || decode.op[1].has_ea || decode.op[2].has_ea) {
+    if (decode.e.special != X86_SPECIAL_NoLoadEA &&
+        (decode.op[0].has_ea || decode.op[1].has_ea || decode.op[2].has_ea)) {
         gen_load_ea(s, &decode.mem, decode.e.vex_class == 12);
     }
     if (s->prefix & PREFIX_LOCK) {
diff --git a/target/i386/tcg/emit.c.inc b/target/i386/tcg/emit.c.inc
index 78d89db57cd..e6521632edd 100644
--- a/target/i386/tcg/emit.c.inc
+++ b/target/i386/tcg/emit.c.inc
@@ -1970,7 +1970,8 @@  static void gen_LDS(DisasContext *s, X86DecodedInsn *decode)
 
 static void gen_LEA(DisasContext *s, X86DecodedInsn *decode)
 {
-    tcg_gen_mov_tl(s->T0, s->A0);
+    TCGv ea = gen_lea_modrm_1(s, decode->mem, false);
+    gen_lea_v_seg_dest(s, s->aflag, s->T0, ea, -1, -1);
 }
 
 static void gen_LEAVE(DisasContext *s, X86DecodedInsn *decode)