[Qemu-devel] [PULL 19/28] target-i386: Use gen_lea_v_seg in stack subroutines

[Paolo Bonzini <pbonzini@redhat.com>]

From: Richard Henderson <rth@twiddle.net>

I.e. gen_push_v, gen_pop_T0, gen_stack_A0.
More centralization of handling of segment bases.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1450379966-28198-5-git-send-email-rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target-i386/translate.c | 52 +++++++++++++------------------------------------
 1 file changed, 13 insertions(+), 39 deletions(-)

diff --git a/target-i386/translate.c b/target-i386/translate.c
index 86a6aa1..098a797 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -459,10 +459,9 @@ static inline void gen_jmp_im(target_ulong pc)
 /* Compute SEG:REG into A0.  SEG is selected from the override segment
    (OVR_SEG) and the default segment (DEF_SEG).  OVR_SEG may be -1 to
    indicate no override.  */
-static void gen_lea_v_seg(DisasContext *s, TCGv a0, int def_seg, int ovr_seg)
+static void gen_lea_v_seg(DisasContext *s, TCGMemOp aflag, TCGv a0,
+                          int def_seg, int ovr_seg)
 {
-    TCGMemOp aflag = s->aflag;
-
     switch (aflag) {
 #ifdef TARGET_X86_64
     case MO_64:
@@ -520,12 +519,12 @@ static void gen_lea_v_seg(DisasContext *s, TCGv a0, int def_seg, int ovr_seg)
 
 static inline void gen_string_movl_A0_ESI(DisasContext *s)
 {
-    gen_lea_v_seg(s, cpu_regs[R_ESI], R_DS, s->override);
+    gen_lea_v_seg(s, s->aflag, cpu_regs[R_ESI], R_DS, s->override);
 }
 
 static inline void gen_string_movl_A0_EDI(DisasContext *s)
 {
-    gen_lea_v_seg(s, cpu_regs[R_EDI], R_ES, -1);
+    gen_lea_v_seg(s, s->aflag, cpu_regs[R_EDI], R_ES, -1);
 }
 
 static inline void gen_op_movl_T0_Dshift(TCGMemOp ot)
@@ -1984,7 +1983,7 @@ static void gen_lea_modrm(CPUX86State *env, DisasContext *s, int modrm)
         tcg_abort();
     }
 
-    gen_lea_v_seg(s, sum, def_seg, ovr_seg);
+    gen_lea_v_seg(s, s->aflag, sum, def_seg, ovr_seg);
 }
 
 static void gen_nop_modrm(CPUX86State *env, DisasContext *s, int modrm)
@@ -2047,7 +2046,7 @@ static void gen_nop_modrm(CPUX86State *env, DisasContext *s, int modrm)
 /* used for LEA and MOV AX, mem */
 static void gen_add_A0_ds_seg(DisasContext *s)
 {
-    gen_lea_v_seg(s, cpu_A0, R_DS, s->override);
+    gen_lea_v_seg(s, s->aflag, cpu_A0, R_DS, s->override);
 }
 
 /* generate modrm memory load or store of 'reg'. TMP0 is used if reg ==
@@ -2272,21 +2271,12 @@ static void gen_push_v(DisasContext *s, TCGv val)
 
     tcg_gen_subi_tl(cpu_A0, cpu_regs[R_ESP], size);
 
-    if (CODE64(s)) {
-        /* No special handling.  */
-    } else if (s->ss32) {
+    if (!CODE64(s)) {
         if (s->addseg) {
             new_esp = cpu_tmp4;
             tcg_gen_mov_tl(new_esp, cpu_A0);
-            gen_op_addl_A0_seg(s, R_SS);
-        } else {
-            tcg_gen_ext32u_tl(cpu_A0, cpu_A0);
         }
-    } else {
-        new_esp = cpu_tmp4;
-        tcg_gen_ext16u_tl(cpu_A0, cpu_A0);
-        tcg_gen_mov_tl(new_esp, cpu_A0);
-        gen_op_addl_A0_seg(s, R_SS);
+        gen_lea_v_seg(s, a_ot, cpu_A0, R_SS, -1);
     }
 
     gen_op_st_v(s, d_ot, val, cpu_A0);
@@ -2297,37 +2287,21 @@ static void gen_push_v(DisasContext *s, TCGv val)
 static TCGMemOp gen_pop_T0(DisasContext *s)
 {
     TCGMemOp d_ot = mo_pushpop(s, s->dflag);
-    TCGv addr = cpu_A0;
 
-    if (CODE64(s)) {
-        addr = cpu_regs[R_ESP];
-    } else if (!s->ss32) {
-        tcg_gen_ext16u_tl(cpu_A0, cpu_regs[R_ESP]);
-        gen_op_addl_A0_seg(s, R_SS);
-    } else if (s->addseg) {
-        tcg_gen_mov_tl(cpu_A0, cpu_regs[R_ESP]);
-        gen_op_addl_A0_seg(s, R_SS);
-    } else {
-        tcg_gen_ext32u_tl(cpu_A0, cpu_regs[R_ESP]);
-    }
+    gen_lea_v_seg(s, mo_stacksize(s), cpu_regs[R_ESP], R_SS, -1);
+    gen_op_ld_v(s, d_ot, cpu_T[0], cpu_A0);
 
-    gen_op_ld_v(s, d_ot, cpu_T[0], addr);
     return d_ot;
 }
 
-static void gen_pop_update(DisasContext *s, TCGMemOp ot)
+static inline void gen_pop_update(DisasContext *s, TCGMemOp ot)
 {
     gen_stack_update(s, 1 << ot);
 }
 
-static void gen_stack_A0(DisasContext *s)
+static inline void gen_stack_A0(DisasContext *s)
 {
-    gen_op_movl_A0_reg(R_ESP);
-    if (!s->ss32)
-        tcg_gen_ext16u_tl(cpu_A0, cpu_A0);
-    tcg_gen_mov_tl(cpu_T[1], cpu_A0);
-    if (s->addseg)
-        gen_op_addl_A0_seg(s, R_SS);
+    gen_lea_v_seg(s, s->ss32 ? MO_32 : MO_16, cpu_regs[R_ESP], R_SS, -1);
 }
 
 /* NOTE: wrap around in 16 bit not fully handled */
-- 
1.8.3.1