[v3,02/14] tcg: Add tcg_out_tb_start backend hook

diff --git a/tcg/tcg.c b/tcg/tcg.c
index ddfe9a96cb..1e9b7433bb 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -108,6 +108,7 @@  static void tcg_register_jit_int(const void *buf, size_t size,
     __attribute__((unused));
 
 /* Forward declarations for functions declared and used in tcg-target.c.inc. */
+static void tcg_out_tb_start(TCGContext *s);
 static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg1,
                        intptr_t arg2);
 static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg);
@@ -6009,6 +6010,8 @@  int tcg_gen_code(TCGContext *s, TranslationBlock *tb, uint64_t pc_start)
     s->gen_insn_data =
         tcg_malloc(sizeof(uint64_t) * s->gen_tb->icount * start_words);
 
+    tcg_out_tb_start(s);
+
     num_insns = -1;
     QTAILQ_FOREACH(op, &s->ops, link) {
         TCGOpcode opc = op->opc;
diff --git a/tcg/aarch64/tcg-target.c.inc b/tcg/aarch64/tcg-target.c.inc
index 35ca80cd56..8d71ac68f6 100644
--- a/tcg/aarch64/tcg-target.c.inc
+++ b/tcg/aarch64/tcg-target.c.inc
@@ -3123,6 +3123,11 @@  static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out_insn(s, 3207, RET, TCG_REG_LR);
 }
 
+static void tcg_out_tb_start(TCGContext *s)
+{
+    /* nothing to do */
+}
+
 static void tcg_out_nop_fill(tcg_insn_unit *p, int count)
 {
     int i;
diff --git a/tcg/arm/tcg-target.c.inc b/tcg/arm/tcg-target.c.inc
index 83e286088f..7473b23672 100644
--- a/tcg/arm/tcg-target.c.inc
+++ b/tcg/arm/tcg-target.c.inc
@@ -2951,6 +2951,11 @@  static void tcg_out_epilogue(TCGContext *s)
                   (1 << TCG_REG_R10) | (1 << TCG_REG_R11) | (1 << TCG_REG_PC));
 }
 
+static void tcg_out_tb_start(TCGContext *s)
+{
+    /* nothing to do */
+}
+
 typedef struct {
     DebugFrameHeader h;
     uint8_t fde_def_cfa[4];
diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index a6b2eae995..05581dd89d 100644
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -4114,6 +4114,11 @@  static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out_opc(s, OPC_RET, 0, 0, 0);
 }
 
+static void tcg_out_tb_start(TCGContext *s)
+{
+    /* nothing to do */
+}
+
 static void tcg_out_nop_fill(tcg_insn_unit *p, int count)
 {
     memset(p, 0x90, count);
diff --git a/tcg/loongarch64/tcg-target.c.inc b/tcg/loongarch64/tcg-target.c.inc
index baf5fc3819..29281e954b 100644
--- a/tcg/loongarch64/tcg-target.c.inc
+++ b/tcg/loongarch64/tcg-target.c.inc
@@ -1698,6 +1698,11 @@  static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out_opc_jirl(s, TCG_REG_ZERO, TCG_REG_RA, 0);
 }
 
+static void tcg_out_tb_start(TCGContext *s)
+{
+    /* nothing to do */
+}
+
 static void tcg_target_init(TCGContext *s)
 {
     unsigned long hwcap = qemu_getauxval(AT_HWCAP);
diff --git a/tcg/mips/tcg-target.c.inc b/tcg/mips/tcg-target.c.inc
index 9faa8bdf0b..b4da737dbb 100644
--- a/tcg/mips/tcg-target.c.inc
+++ b/tcg/mips/tcg-target.c.inc
@@ -2628,6 +2628,11 @@  static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out_opc_reg(s, OPC_OR, TCG_TMP3, TCG_TMP3, TCG_TMP1);
 }
 
+static void tcg_out_tb_start(TCGContext *s)
+{
+    /* nothing to do */
+}
+
 static void tcg_target_init(TCGContext *s)
 {
     tcg_target_detect_isa();
diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc
index 642d0fd128..97b7697921 100644
--- a/tcg/ppc/tcg-target.c.inc
+++ b/tcg/ppc/tcg-target.c.inc
@@ -2482,6 +2482,11 @@  static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out32(s, BCLR | BO_ALWAYS);
 }
 
+static void tcg_out_tb_start(TCGContext *s)
+{
+    /* nothing to do */
+}
+
 static void tcg_out_exit_tb(TCGContext *s, uintptr_t arg)
 {
     tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R3, arg);
diff --git a/tcg/riscv/tcg-target.c.inc b/tcg/riscv/tcg-target.c.inc
index eeaeb6b6e3..22834d087b 100644
--- a/tcg/riscv/tcg-target.c.inc
+++ b/tcg/riscv/tcg-target.c.inc
@@ -2054,6 +2054,11 @@  static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out_opc_imm(s, OPC_JALR, TCG_REG_ZERO, TCG_REG_RA, 0);
 }
 
+static void tcg_out_tb_start(TCGContext *s)
+{
+    /* nothing to do */
+}
+
 static volatile sig_atomic_t got_sigill;
 
 static void sigill_handler(int signo, siginfo_t *si, void *data)
diff --git a/tcg/s390x/tcg-target.c.inc b/tcg/s390x/tcg-target.c.inc
index a94f7908d6..379aaef1e5 100644
--- a/tcg/s390x/tcg-target.c.inc
+++ b/tcg/s390x/tcg-target.c.inc
@@ -3457,6 +3457,11 @@  static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out_insn(s, RR, BCR, S390_CC_ALWAYS, TCG_REG_R14);
 }
 
+static void tcg_out_tb_start(TCGContext *s)
+{
+    /* nothing to do */
+}
+
 static void tcg_out_nop_fill(tcg_insn_unit *p, int count)
 {
     memset(p, 0x07, count * sizeof(tcg_insn_unit));
diff --git a/tcg/sparc64/tcg-target.c.inc b/tcg/sparc64/tcg-target.c.inc
index ffcb879211..6458ca202d 100644
--- a/tcg/sparc64/tcg-target.c.inc
+++ b/tcg/sparc64/tcg-target.c.inc
@@ -955,6 +955,11 @@  static void tcg_target_qemu_prologue(TCGContext *s)
     tcg_out_movi_s13(s, TCG_REG_O0, 0);
 }
 
+static void tcg_out_tb_start(TCGContext *s)
+{
+    /* nothing to do */
+}
+
 static void tcg_out_nop_fill(tcg_insn_unit *p, int count)
 {
     int i;
diff --git a/tcg/tci/tcg-target.c.inc b/tcg/tci/tcg-target.c.inc
index 253f27f174..95b3352f82 100644
--- a/tcg/tci/tcg-target.c.inc
+++ b/tcg/tci/tcg-target.c.inc
@@ -955,6 +955,11 @@  static inline void tcg_target_qemu_prologue(TCGContext *s)
 {
 }
 
+static void tcg_out_tb_start(TCGContext *s)
+{
+    /* nothing to do */
+}
+
 bool tcg_target_has_memory_bswap(MemOp memop)
 {
     return true;