tcg: Add tcg_out_tb_start backend hook

This hook may emit code at the beginning of the TB.

Suggested-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/tcg/aarch64/tcg-target.c.inc b/tcg/aarch64/tcg-target.c.inc
index a1e2b6be1640d2906f679fadd41753542b0919bb..a0b65029d4259e1f7d60326c74617d48f4118a80 100644 (file)
--- a/tcg/aarch64/tcg-target.c.inc
+++ b/tcg/aarch64/tcg-target.c.inc
@@ -3135,6 +3135,11 @@ 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 76f13450029f913d1b4aa76d0c59f817e1efde19..b1d56362a747d30b92dfedcd60a90042b3ec3167 100644 (file)
--- a/tcg/arm/tcg-target.c.inc
+++ b/tcg/arm/tcg-target.c.inc
@@ -2962,6 +2962,11 @@ 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 aed91e515e6914163ef0f8e4247b0f41eec8093f..4e47151241cc356402d009a80011bdf279d3b901 100644 (file)
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -4191,6 +4191,11 @@ 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 fde744e766f59db025375c270e4c94a658af4c32..b701df50db82ae428b38fb8c603813f01a999f9d 100644 (file)
--- a/tcg/loongarch64/tcg-target.c.inc
+++ b/tcg/loongarch64/tcg-target.c.inc
@@ -2296,6 +2296,11 @@ 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 c6662889f0e70ac4a998fb3fdd8b110e81b1b576..f52bda482850c2ec8fc608ca99a966fb0d4828c1 100644 (file)
--- 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 ccf245191d99510b1e152eb6cd2c3ed6ba9f3199..90d76c2c2c75298928509a5f03b1a649df210d9b 100644 (file)
--- a/tcg/ppc/tcg-target.c.inc
+++ b/tcg/ppc/tcg-target.c.inc
@@ -2527,6 +2527,11 @@ 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 3bd7959e7ea30cd16c7bee7c84d09993493d5b70..c2bcdea33f97af53b9176e8bcb42c718d775b150 100644 (file)
--- a/tcg/riscv/tcg-target.c.inc
+++ b/tcg/riscv/tcg-target.c.inc
@@ -2099,6 +2099,11 @@ 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 f4d3abcb719843b2b423c1caead00cf2fb696898..7552f63a0575ca353e7b351f7f1f94f3d32cfeb3 100644 (file)
--- a/tcg/s390x/tcg-target.c.inc
+++ b/tcg/s390x/tcg-target.c.inc
@@ -3483,6 +3483,11 @@ 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 6b9be4c5209c4849c8196ca2b9caf0ab52a834c6..01ac26c1920c85ff3d13bd7853183cc2895324b6 100644 (file)
--- a/tcg/sparc64/tcg-target.c.inc
+++ b/tcg/sparc64/tcg-target.c.inc
@@ -962,6 +962,11 @@ 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/tcg.c b/tcg/tcg.c
index e81e8936d6b24bd8afb2002cbc6cdafc1fe1c7a1..604fa9bf3e8351b5fd5e5b116bfcc3196eb7e05d 100644 (file)
--- 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);
@@ -6014,6 +6015,8 @@ 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/tci/tcg-target.c.inc b/tcg/tci/tcg-target.c.inc
index 1dbb4b087e912c39e0f4519fa18a3bb4094b8164..461f4b47ffcbce7c7082521b53ebcf673c155a77 100644 (file)
--- 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;