Merge remote-tracking branch 'remotes/vivier/tags/m68k-for-2.12-pull-request' into staging

# gpg: Signature made Tue 20 Mar 2018 09:07:55 GMT
# gpg:                using RSA key F30C38BD3F2FBE3C
# gpg: Good signature from "Laurent Vivier <lvivier@redhat.com>"
# gpg:                 aka "Laurent Vivier <laurent@vivier.eu>"
# gpg:                 aka "Laurent Vivier (Red Hat) <lvivier@redhat.com>"
# Primary key fingerprint: CD2F 75DD C8E3 A4DC 2E4F  5173 F30C 38BD 3F2F BE3C

* remotes/vivier/tags/m68k-for-2.12-pull-request:
  target/m68k: add a mechanism to automatically free TCGv
  target/m68k: add DisasContext parameter to gen_extend()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 66 insertions, 36 deletions

diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index cef6f663ad..6beaf9ed66 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -123,8 +123,34 @@ typedef struct DisasContext {
     int done_mac;
     int writeback_mask;
     TCGv writeback[8];
+#define MAX_TO_RELEASE 8
+    int release_count;
+    TCGv release[MAX_TO_RELEASE];
 } DisasContext;
 
+static void init_release_array(DisasContext *s)
+{
+#ifdef CONFIG_DEBUG_TCG
+    memset(s->release, 0, sizeof(s->release));
+#endif
+    s->release_count = 0;
+}
+
+static void do_release(DisasContext *s)
+{
+    int i;
+    for (i = 0; i < s->release_count; i++) {
+        tcg_temp_free(s->release[i]);
+    }
+    init_release_array(s);
+}
+
+static TCGv mark_to_release(DisasContext *s, TCGv tmp)
+{
+    g_assert(s->release_count < MAX_TO_RELEASE);
+    return s->release[s->release_count++] = tmp;
+}
+
 static TCGv get_areg(DisasContext *s, unsigned regno)
 {
     if (s->writeback_mask & (1 << regno)) {
@@ -347,7 +373,8 @@ static TCGv gen_ldst(DisasContext *s, int opsize, TCGv addr, TCGv val,
         gen_store(s, opsize, addr, val, index);
         return store_dummy;
     } else {
-        return gen_load(s, opsize, addr, what == EA_LOADS, index);
+        return mark_to_release(s, gen_load(s, opsize, addr,
+                                           what == EA_LOADS, index));
     }
 }
 
@@ -439,7 +466,7 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base)
         } else {
             bd = 0;
         }
-        tmp = tcg_temp_new();
+        tmp = mark_to_release(s, tcg_temp_new());
         if ((ext & 0x44) == 0) {
             /* pre-index */
             add = gen_addr_index(s, ext, tmp);
@@ -449,7 +476,7 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base)
         if ((ext & 0x80) == 0) {
             /* base not suppressed */
             if (IS_NULL_QREG(base)) {
-                base = tcg_const_i32(offset + bd);
+                base = mark_to_release(s, tcg_const_i32(offset + bd));
                 bd = 0;
             }
             if (!IS_NULL_QREG(add)) {
@@ -465,11 +492,11 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base)
                 add = tmp;
             }
         } else {
-            add = tcg_const_i32(bd);
+            add = mark_to_release(s, tcg_const_i32(bd));
         }
         if ((ext & 3) != 0) {
             /* memory indirect */
-            base = gen_load(s, OS_LONG, add, 0, IS_USER(s));
+            base = mark_to_release(s, gen_load(s, OS_LONG, add, 0, IS_USER(s)));
             if ((ext & 0x44) == 4) {
                 add = gen_addr_index(s, ext, tmp);
                 tcg_gen_add_i32(tmp, add, base);
@@ -494,7 +521,7 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base)
         }
     } else {
         /* brief extension word format */
-        tmp = tcg_temp_new();
+        tmp = mark_to_release(s, tcg_temp_new());
         add = gen_addr_index(s, ext, tmp);
         if (!IS_NULL_QREG(base)) {
             tcg_gen_add_i32(tmp, add, base);
@@ -617,14 +644,14 @@ static void gen_flush_flags(DisasContext *s)
     s->cc_op = CC_OP_FLAGS;
 }
 
-static inline TCGv gen_extend(TCGv val, int opsize, int sign)
+static inline TCGv gen_extend(DisasContext *s, TCGv val, int opsize, int sign)
 {
     TCGv tmp;
 
     if (opsize == OS_LONG) {
         tmp = val;
     } else {
-        tmp = tcg_temp_new();
+        tmp = mark_to_release(s, tcg_temp_new());
         gen_ext(tmp, val, opsize, sign);
     }
 
@@ -746,7 +773,7 @@ static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s,
             return NULL_QREG;
         }
         reg = get_areg(s, reg0);
-        tmp = tcg_temp_new();
+        tmp = mark_to_release(s, tcg_temp_new());
         if (reg0 == 7 && opsize == OS_BYTE &&
             m68k_feature(s->env, M68K_FEATURE_M68000)) {
             tcg_gen_subi_i32(tmp, reg, 2);
@@ -756,7 +783,7 @@ static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s,
         return tmp;
     case 5: /* Indirect displacement.  */
         reg = get_areg(s, reg0);
-        tmp = tcg_temp_new();
+        tmp = mark_to_release(s, tcg_temp_new());
         ext = read_im16(env, s);
         tcg_gen_addi_i32(tmp, reg, (int16_t)ext);
         return tmp;
@@ -767,14 +794,14 @@ static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s,
         switch (reg0) {
         case 0: /* Absolute short.  */
             offset = (int16_t)read_im16(env, s);
-            return tcg_const_i32(offset);
+            return mark_to_release(s, tcg_const_i32(offset));
         case 1: /* Absolute long.  */
             offset = read_im32(env, s);
-            return tcg_const_i32(offset);
+            return mark_to_release(s, tcg_const_i32(offset));
         case 2: /* pc displacement  */
             offset = s->pc;
             offset += (int16_t)read_im16(env, s);
-            return tcg_const_i32(offset);
+            return mark_to_release(s, tcg_const_i32(offset));
         case 3: /* pc index+displacement.  */
             return gen_lea_indexed(env, s, NULL_QREG);
         case 4: /* Immediate.  */
@@ -811,7 +838,7 @@ static TCGv gen_ea_mode(CPUM68KState *env, DisasContext *s, int mode, int reg0,
             gen_partset_reg(opsize, reg, val);
             return store_dummy;
         } else {
-            return gen_extend(reg, opsize, what == EA_LOADS);
+            return gen_extend(s, reg, opsize, what == EA_LOADS);
         }
     case 1: /* Address register direct.  */
         reg = get_areg(s, reg0);
@@ -819,7 +846,7 @@ static TCGv gen_ea_mode(CPUM68KState *env, DisasContext *s, int mode, int reg0,
             tcg_gen_mov_i32(reg, val);
             return store_dummy;
         } else {
-            return gen_extend(reg, opsize, what == EA_LOADS);
+            return gen_extend(s, reg, opsize, what == EA_LOADS);
         }
     case 2: /* Indirect register */
         reg = get_areg(s, reg0);
@@ -900,7 +927,7 @@ static TCGv gen_ea_mode(CPUM68KState *env, DisasContext *s, int mode, int reg0,
             default:
                 g_assert_not_reached();
             }
-            return tcg_const_i32(offset);
+            return mark_to_release(s, tcg_const_i32(offset));
         default:
             return NULL_QREG;
         }
@@ -1759,8 +1786,8 @@ DISAS_INSN(abcd_reg)
 
     gen_flush_flags(s); /* !Z is sticky */
 
-    src = gen_extend(DREG(insn, 0), OS_BYTE, 0);
-    dest = gen_extend(DREG(insn, 9), OS_BYTE, 0);
+    src = gen_extend(s, DREG(insn, 0), OS_BYTE, 0);
+    dest = gen_extend(s, DREG(insn, 9), OS_BYTE, 0);
     bcd_add(dest, src);
     gen_partset_reg(OS_BYTE, DREG(insn, 9), dest);
 
@@ -1794,8 +1821,8 @@ DISAS_INSN(sbcd_reg)
 
     gen_flush_flags(s); /* !Z is sticky */
 
-    src = gen_extend(DREG(insn, 0), OS_BYTE, 0);
-    dest = gen_extend(DREG(insn, 9), OS_BYTE, 0);
+    src = gen_extend(s, DREG(insn, 0), OS_BYTE, 0);
+    dest = gen_extend(s, DREG(insn, 9), OS_BYTE, 0);
 
     bcd_sub(dest, src);
 
@@ -1856,7 +1883,7 @@ DISAS_INSN(addsub)
 
     add = (insn & 0x4000) != 0;
     opsize = insn_opsize(insn);
-    reg = gen_extend(DREG(insn, 9), opsize, 1);
+    reg = gen_extend(s, DREG(insn, 9), opsize, 1);
     dest = tcg_temp_new();
     if (insn & 0x100) {
         SRC_EA(env, tmp, opsize, 1, &addr);
@@ -2386,7 +2413,7 @@ DISAS_INSN(cas)
         return;
     }
 
-    cmp = gen_extend(DREG(ext, 0), opsize, 1);
+    cmp = gen_extend(s, DREG(ext, 0), opsize, 1);
 
     /* if  <EA> == Dc then
      *     <EA> = Du
@@ -3055,7 +3082,7 @@ DISAS_INSN(or)
     int opsize;
 
     opsize = insn_opsize(insn);
-    reg = gen_extend(DREG(insn, 9), opsize, 0);
+    reg = gen_extend(s, DREG(insn, 9), opsize, 0);
     dest = tcg_temp_new();
     if (insn & 0x100) {
         SRC_EA(env, src, opsize, 0, &addr);
@@ -3120,8 +3147,8 @@ DISAS_INSN(subx_reg)
 
     opsize = insn_opsize(insn);
 
-    src = gen_extend(DREG(insn, 0), opsize, 1);
-    dest = gen_extend(DREG(insn, 9), opsize, 1);
+    src = gen_extend(s, DREG(insn, 0), opsize, 1);
+    dest = gen_extend(s, DREG(insn, 9), opsize, 1);
 
     gen_subx(s, src, dest, opsize);
 
@@ -3176,7 +3203,7 @@ DISAS_INSN(cmp)
 
     opsize = insn_opsize(insn);
     SRC_EA(env, src, opsize, 1, NULL);
-    reg = gen_extend(DREG(insn, 9), opsize, 1);
+    reg = gen_extend(s, DREG(insn, 9), opsize, 1);
     gen_update_cc_cmp(s, reg, src, opsize);
 }
 
@@ -3329,8 +3356,8 @@ DISAS_INSN(addx_reg)
 
     opsize = insn_opsize(insn);
 
-    dest = gen_extend(DREG(insn, 9), opsize, 1);
-    src = gen_extend(DREG(insn, 0), opsize, 1);
+    dest = gen_extend(s, DREG(insn, 9), opsize, 1);
+    src = gen_extend(s, DREG(insn, 0), opsize, 1);
 
     gen_addx(s, src, dest, opsize);
 
@@ -3369,7 +3396,7 @@ static inline void shift_im(DisasContext *s, uint16_t insn, int opsize)
     int logical = insn & 8;
     int left = insn & 0x100;
     int bits = opsize_bytes(opsize) * 8;
-    TCGv reg = gen_extend(DREG(insn, 0), opsize, !logical);
+    TCGv reg = gen_extend(s, DREG(insn, 0), opsize, !logical);
 
     if (count == 0) {
         count = 8;
@@ -3419,7 +3446,7 @@ static inline void shift_reg(DisasContext *s, uint16_t insn, int opsize)
     int logical = insn & 8;
     int left = insn & 0x100;
     int bits = opsize_bytes(opsize) * 8;
-    TCGv reg = gen_extend(DREG(insn, 0), opsize, !logical);
+    TCGv reg = gen_extend(s, DREG(insn, 0), opsize, !logical);
     TCGv s32;
     TCGv_i64 t64, s64;
 
@@ -3556,7 +3583,7 @@ DISAS_INSN(shift_mem)
            while M68000 sets if the most significant bit is changed at
            any time during the shift operation */
         if (!logical && m68k_feature(s->env, M68K_FEATURE_M68000)) {
-            src = gen_extend(src, OS_WORD, 1);
+            src = gen_extend(s, src, OS_WORD, 1);
             tcg_gen_xor_i32(QREG_CC_V, QREG_CC_N, src);
         }
     } else {
@@ -3789,7 +3816,7 @@ DISAS_INSN(rotate8_im)
     TCGv shift;
     int tmp;
 
-    reg = gen_extend(DREG(insn, 0), OS_BYTE, 0);
+    reg = gen_extend(s, DREG(insn, 0), OS_BYTE, 0);
 
     tmp = (insn >> 9) & 7;
     if (tmp == 0) {
@@ -3816,7 +3843,7 @@ DISAS_INSN(rotate16_im)
     TCGv shift;
     int tmp;
 
-    reg = gen_extend(DREG(insn, 0), OS_WORD, 0);
+    reg = gen_extend(s, DREG(insn, 0), OS_WORD, 0);
     tmp = (insn >> 9) & 7;
     if (tmp == 0) {
         tmp = 8;
@@ -3876,7 +3903,7 @@ DISAS_INSN(rotate8_reg)
     TCGv t0, t1;
     int left = (insn & 0x100);
 
-    reg = gen_extend(DREG(insn, 0), OS_BYTE, 0);
+    reg = gen_extend(s, DREG(insn, 0), OS_BYTE, 0);
     src = DREG(insn, 9);
     /* shift in [0..63] */
     t0 = tcg_temp_new_i32();
@@ -3911,7 +3938,7 @@ DISAS_INSN(rotate16_reg)
     TCGv t0, t1;
     int left = (insn & 0x100);
 
-    reg = gen_extend(DREG(insn, 0), OS_WORD, 0);
+    reg = gen_extend(s, DREG(insn, 0), OS_WORD, 0);
     src = DREG(insn, 9);
     /* shift in [0..63] */
     t0 = tcg_temp_new_i32();
@@ -4353,7 +4380,7 @@ DISAS_INSN(chk)
         return;
     }
     SRC_EA(env, src, opsize, 1, NULL);
-    reg = gen_extend(DREG(insn, 9), opsize, 1);
+    reg = gen_extend(s, DREG(insn, 9), opsize, 1);
 
     gen_flush_flags(s);
     gen_helper_chk(cpu_env, reg, src);
@@ -6033,6 +6060,7 @@ static void disas_m68k_insn(CPUM68KState * env, DisasContext *s)
     uint16_t insn = read_im16(env, s);
     opcode_table[insn](env, s, insn);
     do_writebacks(s);
+    do_release(s);
 }
 
 /* generate intermediate code for basic block 'tb'.  */
@@ -6067,6 +6095,8 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
         max_insns = TCG_MAX_INSNS;
     }
 
+    init_release_array(dc);
+
     gen_tb_start(tb);
     do {
         pc_offset = dc->pc - pc_start;