hw/core: Make do_unaligned_access noreturn

While we may have had some thought of allowing system-mode
to return from this hook, we have no guests that require this.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/hw/core/tcg-cpu-ops.h

@@ -78,10 +78,11 @@ struct TCGCPUOps {
                                   MemTxResult response, uintptr_t retaddr);
     /**
      * @do_unaligned_access: Callback for unaligned access handling
+     * The callback must exit via raising an exception.
      */
     void (*do_unaligned_access)(CPUState *cpu, vaddr addr,
                                 MMUAccessType access_type,
-                                int mmu_idx, uintptr_t retaddr);
+                                int mmu_idx, uintptr_t retaddr) QEMU_NORETURN;
 
     /**
      * @adjust_watchpoint_address: hack for cpu_check_watchpoint used by ARM

target/alpha/cpu.h

@@ -283,8 +283,8 @@ hwaddr alpha_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 int alpha_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
 int alpha_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 void alpha_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
-                                   MMUAccessType access_type,
-                                   int mmu_idx, uintptr_t retaddr);
+                                   MMUAccessType access_type, int mmu_idx,
+                                   uintptr_t retaddr) QEMU_NORETURN;
 
 #define cpu_list alpha_cpu_list
 

target/arm/internals.h

@@ -594,7 +594,7 @@ bool arm_s1_regime_using_lpae_format(CPUARMState *env, ARMMMUIdx mmu_idx);
 /* Raise a data fault alignment exception for the specified virtual address */
 void arm_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr,
                                  MMUAccessType access_type,
-                                 int mmu_idx, uintptr_t retaddr);
+                                 int mmu_idx, uintptr_t retaddr) QEMU_NORETURN;
 
 /* arm_cpu_do_transaction_failed: handle a memory system error response
  * (eg "no device/memory present at address") by raising an external abort

target/hppa/cpu.c

@@ -72,9 +72,10 @@ static void hppa_cpu_disas_set_info(CPUState *cs, disassemble_info *info)
 }
 
 #ifndef CONFIG_USER_ONLY
-static void hppa_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
-                                         MMUAccessType access_type,
-                                         int mmu_idx, uintptr_t retaddr)
+static void QEMU_NORETURN
+hppa_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
+                             MMUAccessType access_type, int mmu_idx,
+                             uintptr_t retaddr)
 {
     HPPACPU *cpu = HPPA_CPU(cs);
     CPUHPPAState *env = &cpu->env;

target/microblaze/cpu.h

@@ -361,7 +361,7 @@ bool mb_cpu_exec_interrupt(CPUState *cs, int int_req);
 #endif /* !CONFIG_USER_ONLY */
 void mb_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr,
                                 MMUAccessType access_type,
-                                int mmu_idx, uintptr_t retaddr);
+                                int mmu_idx, uintptr_t retaddr) QEMU_NORETURN;
 void mb_cpu_dump_state(CPUState *cpu, FILE *f, int flags);
 hwaddr mb_cpu_get_phys_page_attrs_debug(CPUState *cpu, vaddr addr,
                                         MemTxAttrs *attrs);

target/mips/tcg/tcg-internal.h

@@ -22,8 +22,8 @@ bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
                        MMUAccessType access_type, int mmu_idx,
                        bool probe, uintptr_t retaddr);
 void mips_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
-                                  MMUAccessType access_type,
-                                  int mmu_idx, uintptr_t retaddr);
+                                  MMUAccessType access_type, int mmu_idx,
+                                  uintptr_t retaddr) QEMU_NORETURN;
 
 const char *mips_exception_name(int32_t exception);
 

target/nios2/cpu.h

@@ -197,8 +197,8 @@ void dump_mmu(CPUNios2State *env);
 void nios2_cpu_dump_state(CPUState *cpu, FILE *f, int flags);
 hwaddr nios2_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 void nios2_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
-                                   MMUAccessType access_type,
-                                   int mmu_idx, uintptr_t retaddr);
+                                   MMUAccessType access_type, int mmu_idx,
+                                   uintptr_t retaddr) QEMU_NORETURN;
 
 void do_nios2_semihosting(CPUNios2State *env);
 

target/ppc/internal.h

@@ -213,8 +213,8 @@ void helper_compute_fprf_float128(CPUPPCState *env, float128 arg);
 
 /* Raise a data fault alignment exception for the specified virtual address */
 void ppc_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
-                                 MMUAccessType access_type,
-                                 int mmu_idx, uintptr_t retaddr);
+                                 MMUAccessType access_type, int mmu_idx,
+                                 uintptr_t retaddr) QEMU_NORETURN;
 
 /* translate.c */
 

target/riscv/cpu.h

@@ -344,7 +344,7 @@ int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch);
 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 void  riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
                                     MMUAccessType access_type, int mmu_idx,
-                                    uintptr_t retaddr);
+                                    uintptr_t retaddr) QEMU_NORETURN;
 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
                         MMUAccessType access_type, int mmu_idx,
                         bool probe, uintptr_t retaddr);

target/s390x/s390x-internal.h

@@ -274,8 +274,8 @@ bool s390_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
                        MMUAccessType access_type, int mmu_idx,
                        bool probe, uintptr_t retaddr);
 void s390x_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
-                                   MMUAccessType access_type,
-                                   int mmu_idx, uintptr_t retaddr);
+                                   MMUAccessType access_type, int mmu_idx,
+                                   uintptr_t retaddr) QEMU_NORETURN;
 
 
 /* fpu_helper.c */

target/sh4/cpu.h

@@ -209,8 +209,8 @@ hwaddr superh_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 int superh_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
 int superh_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 void superh_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
-                                    MMUAccessType access_type,
-                                    int mmu_idx, uintptr_t retaddr);
+                                    MMUAccessType access_type, int mmu_idx,
+                                    uintptr_t retaddr) QEMU_NORETURN;
 
 void sh4_translate_init(void);
 bool superh_cpu_tlb_fill(CPUState *cs, vaddr address, int size,

target/xtensa/cpu.h

@@ -581,8 +581,8 @@ void xtensa_count_regs(const XtensaConfig *config,
 int xtensa_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
 int xtensa_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 void xtensa_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
-                                    MMUAccessType access_type,
-                                    int mmu_idx, uintptr_t retaddr);
+                                    MMUAccessType access_type, int mmu_idx,
+                                    uintptr_t retaddr) QEMU_NORETURN;
 
 #define cpu_list xtensa_cpu_list