tcg: Make tb arg to synchronize_from_tb const

There is nothing within the translators that ought to be
changing the TranslationBlock data, so make it const.

This does not actually use the read-only copy of the
data structure that exists within the rx region.

Reviewed-by: Joelle van Dyne <j@getutm.app>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/hw/core/cpu.h

@@ -189,7 +189,8 @@ struct CPUClass {
     void (*get_memory_mapping)(CPUState *cpu, MemoryMappingList *list,
                                Error **errp);
     void (*set_pc)(CPUState *cpu, vaddr value);
-    void (*synchronize_from_tb)(CPUState *cpu, struct TranslationBlock *tb);
+    void (*synchronize_from_tb)(CPUState *cpu,
+                                const struct TranslationBlock *tb);
     bool (*tlb_fill)(CPUState *cpu, vaddr address, int size,
                      MMUAccessType access_type, int mmu_idx,
                      bool probe, uintptr_t retaddr);

target/arm/cpu.c

@@ -54,7 +54,8 @@ static void arm_cpu_set_pc(CPUState *cs, vaddr value)
     }
 }
 
-static void arm_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
+static void arm_cpu_synchronize_from_tb(CPUState *cs,
+                                        const TranslationBlock *tb)
 {
     ARMCPU *cpu = ARM_CPU(cs);
     CPUARMState *env = &cpu->env;

target/avr/cpu.c

@@ -41,7 +41,8 @@ static bool avr_cpu_has_work(CPUState *cs)
             && cpu_interrupts_enabled(env);
 }
 
-static void avr_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
+static void avr_cpu_synchronize_from_tb(CPUState *cs,
+                                        const TranslationBlock *tb)
 {
     AVRCPU *cpu = AVR_CPU(cs);
     CPUAVRState *env = &cpu->env;

target/hppa/cpu.c

@@ -35,7 +35,8 @@ static void hppa_cpu_set_pc(CPUState *cs, vaddr value)
     cpu->env.iaoq_b = value + 4;
 }
 
-static void hppa_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
+static void hppa_cpu_synchronize_from_tb(CPUState *cs,
+                                         const TranslationBlock *tb)
 {
     HPPACPU *cpu = HPPA_CPU(cs);
 

target/i386/tcg/tcg-cpu.c

@@ -49,7 +49,8 @@ static void x86_cpu_exec_exit(CPUState *cs)
     env->eflags = cpu_compute_eflags(env);
 }
 
-static void x86_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
+static void x86_cpu_synchronize_from_tb(CPUState *cs,
+                                        const TranslationBlock *tb)
 {
     X86CPU *cpu = X86_CPU(cs);
 

target/microblaze/cpu.c

@@ -83,7 +83,8 @@ static void mb_cpu_set_pc(CPUState *cs, vaddr value)
     cpu->env.iflags = 0;
 }
 
-static void mb_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
+static void mb_cpu_synchronize_from_tb(CPUState *cs,
+                                       const TranslationBlock *tb)
 {
     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
 

target/mips/cpu.c

@@ -47,7 +47,8 @@ static void mips_cpu_set_pc(CPUState *cs, vaddr value)
     }
 }
 
-static void mips_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
+static void mips_cpu_synchronize_from_tb(CPUState *cs,
+                                         const TranslationBlock *tb)
 {
     MIPSCPU *cpu = MIPS_CPU(cs);
     CPUMIPSState *env = &cpu->env;

target/riscv/cpu.c

@@ -314,7 +314,8 @@ static void riscv_cpu_set_pc(CPUState *cs, vaddr value)
     env->pc = value;
 }
 
-static void riscv_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
+static void riscv_cpu_synchronize_from_tb(CPUState *cs,
+                                          const TranslationBlock *tb)
 {
     RISCVCPU *cpu = RISCV_CPU(cs);
     CPURISCVState *env = &cpu->env;

target/rx/cpu.c

@@ -33,7 +33,8 @@ static void rx_cpu_set_pc(CPUState *cs, vaddr value)
     cpu->env.pc = value;
 }
 
-static void rx_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
+static void rx_cpu_synchronize_from_tb(CPUState *cs,
+                                       const TranslationBlock *tb)
 {
     RXCPU *cpu = RX_CPU(cs);
 

target/sh4/cpu.c

@@ -34,7 +34,8 @@ static void superh_cpu_set_pc(CPUState *cs, vaddr value)
     cpu->env.pc = value;
 }
 
-static void superh_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
+static void superh_cpu_synchronize_from_tb(CPUState *cs,
+                                           const TranslationBlock *tb)
 {
     SuperHCPU *cpu = SUPERH_CPU(cs);
 

target/sparc/cpu.c

@@ -691,7 +691,8 @@ static void sparc_cpu_set_pc(CPUState *cs, vaddr value)
     cpu->env.npc = value + 4;
 }
 
-static void sparc_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
+static void sparc_cpu_synchronize_from_tb(CPUState *cs,
+                                          const TranslationBlock *tb)
 {
     SPARCCPU *cpu = SPARC_CPU(cs);
 

target/tricore/cpu.c

@@ -42,7 +42,7 @@ static void tricore_cpu_set_pc(CPUState *cs, vaddr value)
 }
 
 static void tricore_cpu_synchronize_from_tb(CPUState *cs,
-                                            TranslationBlock *tb)
+                                            const TranslationBlock *tb)
 {
     TriCoreCPU *cpu = TRICORE_CPU(cs);
     CPUTriCoreState *env = &cpu->env;