tcg: Move tcg epilogue pointer out of TCGContext

This value is constant across all thread-local copies of TCGContext,
so we might as well move it out of thread-local storage.

Reviewed-by: Joelle van Dyne <j@getutm.app>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

11 files changed, 16 insertions, 15 deletions

diff --git a/accel/tcg/tcg-runtime.c b/accel/tcg/tcg-runtime.c
index 446465a..f85dfef 100644
--- a/accel/tcg/tcg-runtime.c
+++ b/accel/tcg/tcg-runtime.c
@@ -154,7 +154,7 @@ void *HELPER(lookup_tb_ptr)(CPUArchState *env)
 
     tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags, curr_cflags());
     if (tb == NULL) {
-        return tcg_ctx->code_gen_epilogue;
+        return tcg_code_gen_epilogue;
     }
     qemu_log_mask_and_addr(CPU_LOG_EXEC, pc,
                            "Chain %d: %p ["
diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index 9cc412f..bb1e97b 100644
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -621,7 +621,6 @@ struct TCGContext {
        here, because there's too much arithmetic throughout that relies
        on addition and subtraction working on bytes.  Rely on the GCC
        extension that allows arithmetic on void*.  */
-    void *code_gen_epilogue;
     void *code_gen_buffer;
     size_t code_gen_buffer_size;
     void *code_gen_ptr;
@@ -678,6 +677,7 @@ struct TCGContext {
 
 extern TCGContext tcg_init_ctx;
 extern __thread TCGContext *tcg_ctx;
+extern void *tcg_code_gen_epilogue;
 extern TCGv_env cpu_env;
 
 static inline size_t temp_idx(TCGTemp *ts)
diff --git a/tcg/aarch64/tcg-target.c.inc b/tcg/aarch64/tcg-target.c.inc
index 83af310..76f8ae4 100644
--- a/tcg/aarch64/tcg-target.c.inc
+++ b/tcg/aarch64/tcg-target.c.inc
@@ -1873,7 +1873,7 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
     case INDEX_op_exit_tb:
         /* Reuse the zeroing that exists for goto_ptr.  */
         if (a0 == 0) {
-            tcg_out_goto_long(s, s->code_gen_epilogue);
+            tcg_out_goto_long(s, tcg_code_gen_epilogue);
         } else {
             tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_X0, a0);
             tcg_out_goto_long(s, tb_ret_addr);
@@ -2894,7 +2894,7 @@ static void tcg_target_qemu_prologue(TCGContext *s)
      * Return path for goto_ptr. Set return value to 0, a-la exit_tb,
      * and fall through to the rest of the epilogue.
      */
-    s->code_gen_epilogue = s->code_ptr;
+    tcg_code_gen_epilogue = s->code_ptr;
     tcg_out_movi(s, TCG_TYPE_REG, TCG_REG_X0, 0);
 
     /* TB epilogue */
diff --git a/tcg/arm/tcg-target.c.inc b/tcg/arm/tcg-target.c.inc
index 62c37a9..1e32bf4 100644
--- a/tcg/arm/tcg-target.c.inc
+++ b/tcg/arm/tcg-target.c.inc
@@ -2297,7 +2297,7 @@ static void tcg_target_qemu_prologue(TCGContext *s)
      * Return path for goto_ptr. Set return value to 0, a-la exit_tb,
      * and fall through to the rest of the epilogue.
      */
-    s->code_gen_epilogue = s->code_ptr;
+    tcg_code_gen_epilogue = s->code_ptr;
     tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R0, 0);
     tcg_out_epilogue(s);
 }
diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index f8e9a24..ee3a270 100644
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -2240,7 +2240,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
     case INDEX_op_exit_tb:
         /* Reuse the zeroing that exists for goto_ptr.  */
         if (a0 == 0) {
-            tcg_out_jmp(s, s->code_gen_epilogue);
+            tcg_out_jmp(s, tcg_code_gen_epilogue);
         } else {
             tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_EAX, a0);
             tcg_out_jmp(s, tb_ret_addr);
@@ -3803,7 +3803,7 @@ static void tcg_target_qemu_prologue(TCGContext *s)
      * Return path for goto_ptr. Set return value to 0, a-la exit_tb,
      * and fall through to the rest of the epilogue.
      */
-    s->code_gen_epilogue = s->code_ptr;
+    tcg_code_gen_epilogue = s->code_ptr;
     tcg_out_movi(s, TCG_TYPE_REG, TCG_REG_EAX, 0);
 
     /* TB epilogue */
diff --git a/tcg/mips/tcg-target.c.inc b/tcg/mips/tcg-target.c.inc
index c255ecb..f641105 100644
--- a/tcg/mips/tcg-target.c.inc
+++ b/tcg/mips/tcg-target.c.inc
@@ -2483,7 +2483,7 @@ static void tcg_target_qemu_prologue(TCGContext *s)
      * Return path for goto_ptr. Set return value to 0, a-la exit_tb,
      * and fall through to the rest of the epilogue.
      */
-    s->code_gen_epilogue = s->code_ptr;
+    tcg_code_gen_epilogue = s->code_ptr;
     tcg_out_mov(s, TCG_TYPE_REG, TCG_REG_V0, TCG_REG_ZERO);
 
     /* TB epilogue */
diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc
index b756281..15d5c78 100644
--- a/tcg/ppc/tcg-target.c.inc
+++ b/tcg/ppc/tcg-target.c.inc
@@ -2341,7 +2341,7 @@ static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out32(s, BCCTR | BO_ALWAYS);
 
     /* Epilogue */
-    s->code_gen_epilogue = tb_ret_addr = s->code_ptr;
+    tcg_code_gen_epilogue = tb_ret_addr = s->code_ptr;
 
     tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_R0, TCG_REG_R1, FRAME_SIZE+LR_OFFSET);
     for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); ++i) {
diff --git a/tcg/riscv/tcg-target.c.inc b/tcg/riscv/tcg-target.c.inc
index 4089e29..25df85b 100644
--- a/tcg/riscv/tcg-target.c.inc
+++ b/tcg/riscv/tcg-target.c.inc
@@ -1288,7 +1288,7 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
     case INDEX_op_exit_tb:
         /* Reuse the zeroing that exists for goto_ptr.  */
         if (a0 == 0) {
-            tcg_out_call_int(s, s->code_gen_epilogue, true);
+            tcg_out_call_int(s, tcg_code_gen_epilogue, true);
         } else {
             tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_A0, a0);
             tcg_out_call_int(s, tb_ret_addr, true);
@@ -1822,7 +1822,7 @@ static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out_opc_imm(s, OPC_JALR, TCG_REG_ZERO, tcg_target_call_iarg_regs[1], 0);
 
     /* Return path for goto_ptr. Set return value to 0 */
-    s->code_gen_epilogue = s->code_ptr;
+    tcg_code_gen_epilogue = s->code_ptr;
     tcg_out_mov(s, TCG_TYPE_REG, TCG_REG_A0, TCG_REG_ZERO);
 
     /* TB epilogue */
diff --git a/tcg/s390/tcg-target.c.inc b/tcg/s390/tcg-target.c.inc
index c5e0964..ac99cce 100644
--- a/tcg/s390/tcg-target.c.inc
+++ b/tcg/s390/tcg-target.c.inc
@@ -1756,7 +1756,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
         /* Reuse the zeroing that exists for goto_ptr.  */
         a0 = args[0];
         if (a0 == 0) {
-            tgen_gotoi(s, S390_CC_ALWAYS, s->code_gen_epilogue);
+            tgen_gotoi(s, S390_CC_ALWAYS, tcg_code_gen_epilogue);
         } else {
             tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R2, a0);
             tgen_gotoi(s, S390_CC_ALWAYS, tb_ret_addr);
@@ -2561,7 +2561,7 @@ static void tcg_target_qemu_prologue(TCGContext *s)
      * Return path for goto_ptr. Set return value to 0, a-la exit_tb,
      * and fall through to the rest of the epilogue.
      */
-    s->code_gen_epilogue = s->code_ptr;
+    tcg_code_gen_epilogue = s->code_ptr;
     tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R2, 0);
 
     /* TB epilogue */
diff --git a/tcg/sparc/tcg-target.c.inc b/tcg/sparc/tcg-target.c.inc
index 6e2d755..5b3bc91 100644
--- a/tcg/sparc/tcg-target.c.inc
+++ b/tcg/sparc/tcg-target.c.inc
@@ -1038,7 +1038,7 @@ static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out_nop(s);
 
     /* Epilogue for goto_ptr.  */
-    s->code_gen_epilogue = s->code_ptr;
+    tcg_code_gen_epilogue = s->code_ptr;
     tcg_out_arithi(s, TCG_REG_G0, TCG_REG_I7, 8, RETURN);
     /* delay slot */
     tcg_out_movi_imm13(s, TCG_REG_O0, 0);
diff --git a/tcg/tcg.c b/tcg/tcg.c
index b686cc9..12f598c 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -161,6 +161,7 @@ static int tcg_out_ldst_finalize(TCGContext *s);
 static TCGContext **tcg_ctxs;
 static unsigned int n_tcg_ctxs;
 TCGv_env cpu_env = 0;
+void *tcg_code_gen_epilogue;
 
 #ifndef CONFIG_TCG_INTERPRETER
 tcg_prologue_fn *tcg_qemu_tb_exec;
@@ -1133,7 +1134,7 @@ void tcg_prologue_init(TCGContext *s)
 
     /* Assert that goto_ptr is implemented completely.  */
     if (TCG_TARGET_HAS_goto_ptr) {
-        tcg_debug_assert(s->code_gen_epilogue != NULL);
+        tcg_debug_assert(tcg_code_gen_epilogue != NULL);
     }
 }