cleanup cpu-exec.c, part 0/N: consolidate handle_cpu_signal

handle_cpu_signal is very nearly copy-paste code for each target, with a
few minor variations.  This patch sets up appropriate defaults for a
generic handle_cpu_signal and provides overrides for particular targets
that did things differently.  Fixing things like the persistent (XXX:
use sigsetjmp) should now become somewhat easier.

Previous comments on this patch suggest that the "activate soft MMU for
this block" comments refer to defunct functionality.  I have removed
such blocks for the appropriate targets in this patch.

Signed-off-by: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

11 files changed, 16 insertions, 409 deletions

diff --git a/cpu-exec.c b/cpu-exec.c
index 17fe972598..bf20ada1a0 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -746,6 +746,10 @@ void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
 #if !defined(CONFIG_SOFTMMU)
 
 #if defined(TARGET_I386)
+#define EXCEPTION_ACTION raise_exception_err(env->exception_index, env->error_code)
+#else
+#define EXCEPTION_ACTION cpu_loop_exit()
+#endif
 
 /* 'pc' is the host PC at which the exception was raised. 'address' is
    the effective address of the memory exception. 'is_write' is 1 if a
@@ -770,56 +774,7 @@ static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
     }
 
     /* see if it is an MMU fault */
-    ret = cpu_x86_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
-    if (ret < 0)
-        return 0; /* not an MMU fault */
-    if (ret == 0)
-        return 1; /* the MMU fault was handled without causing real CPU fault */
-    /* now we have a real cpu fault */
-    tb = tb_find_pc(pc);
-    if (tb) {
-        /* the PC is inside the translated code. It means that we have
-           a virtual CPU fault */
-        cpu_restore_state(tb, env, pc, puc);
-    }
-    if (ret == 1) {
-#if 0
-        printf("PF exception: EIP=0x%08x CR2=0x%08x error=0x%x\n",
-               env->eip, env->cr[2], env->error_code);
-#endif
-        /* we restore the process signal mask as the sigreturn should
-           do it (XXX: use sigsetjmp) */
-        sigprocmask(SIG_SETMASK, old_set, NULL);
-        raise_exception_err(env->exception_index, env->error_code);
-    } else {
-        /* activate soft MMU for this block */
-        env->hflags |= HF_SOFTMMU_MASK;
-        cpu_resume_from_signal(env, puc);
-    }
-    /* never comes here */
-    return 1;
-}
-
-#elif defined(TARGET_ARM)
-static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
-                                    int is_write, sigset_t *old_set,
-                                    void *puc)
-{
-    TranslationBlock *tb;
-    int ret;
-
-    if (cpu_single_env)
-        env = cpu_single_env; /* XXX: find a correct solution for multithread */
-#if defined(DEBUG_SIGNAL)
-    printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
-           pc, address, is_write, *(unsigned long *)old_set);
-#endif
-    /* XXX: locking issue */
-    if (is_write && page_unprotect(h2g(address), pc, puc)) {
-        return 1;
-    }
-    /* see if it is an MMU fault */
-    ret = cpu_arm_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
+    ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
     if (ret < 0)
         return 0; /* not an MMU fault */
     if (ret == 0)
@@ -831,374 +786,16 @@ static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
            a virtual CPU fault */
         cpu_restore_state(tb, env, pc, puc);
     }
-    /* we restore the process signal mask as the sigreturn should
-       do it (XXX: use sigsetjmp) */
-    sigprocmask(SIG_SETMASK, old_set, NULL);
-    cpu_loop_exit();
-    /* never comes here */
-    return 1;
-}
-#elif defined(TARGET_SPARC)
-static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
-                                    int is_write, sigset_t *old_set,
-                                    void *puc)
-{
-    TranslationBlock *tb;
-    int ret;
 
-    if (cpu_single_env)
-        env = cpu_single_env; /* XXX: find a correct solution for multithread */
-#if defined(DEBUG_SIGNAL)
-    printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
-           pc, address, is_write, *(unsigned long *)old_set);
-#endif
-    /* XXX: locking issue */
-    if (is_write && page_unprotect(h2g(address), pc, puc)) {
-        return 1;
-    }
-    /* see if it is an MMU fault */
-    ret = cpu_sparc_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
-    if (ret < 0)
-        return 0; /* not an MMU fault */
-    if (ret == 0)
-        return 1; /* the MMU fault was handled without causing real CPU fault */
-    /* now we have a real cpu fault */
-    tb = tb_find_pc(pc);
-    if (tb) {
-        /* the PC is inside the translated code. It means that we have
-           a virtual CPU fault */
-        cpu_restore_state(tb, env, pc, puc);
-    }
     /* we restore the process signal mask as the sigreturn should
        do it (XXX: use sigsetjmp) */
     sigprocmask(SIG_SETMASK, old_set, NULL);
-    cpu_loop_exit();
-    /* never comes here */
-    return 1;
-}
-#elif defined (TARGET_PPC)
-static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
-                                    int is_write, sigset_t *old_set,
-                                    void *puc)
-{
-    TranslationBlock *tb;
-    int ret;
-
-    if (cpu_single_env)
-        env = cpu_single_env; /* XXX: find a correct solution for multithread */
-#if defined(DEBUG_SIGNAL)
-    printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
-           pc, address, is_write, *(unsigned long *)old_set);
-#endif
-    /* XXX: locking issue */
-    if (is_write && page_unprotect(h2g(address), pc, puc)) {
-        return 1;
-    }
-
-    /* see if it is an MMU fault */
-    ret = cpu_ppc_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
-    if (ret < 0)
-        return 0; /* not an MMU fault */
-    if (ret == 0)
-        return 1; /* the MMU fault was handled without causing real CPU fault */
-
-    /* now we have a real cpu fault */
-    tb = tb_find_pc(pc);
-    if (tb) {
-        /* the PC is inside the translated code. It means that we have
-           a virtual CPU fault */
-        cpu_restore_state(tb, env, pc, puc);
-    }
-    if (ret == 1) {
-#if 0
-        printf("PF exception: NIP=0x%08x error=0x%x %p\n",
-               env->nip, env->error_code, tb);
-#endif
-    /* we restore the process signal mask as the sigreturn should
-       do it (XXX: use sigsetjmp) */
-        sigprocmask(SIG_SETMASK, old_set, NULL);
-        cpu_loop_exit();
-    } else {
-        /* activate soft MMU for this block */
-        cpu_resume_from_signal(env, puc);
-    }
-    /* never comes here */
-    return 1;
-}
+    EXCEPTION_ACTION;
 
-#elif defined(TARGET_M68K)
-static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
-                                    int is_write, sigset_t *old_set,
-                                    void *puc)
-{
-    TranslationBlock *tb;
-    int ret;
-
-    if (cpu_single_env)
-        env = cpu_single_env; /* XXX: find a correct solution for multithread */
-#if defined(DEBUG_SIGNAL)
-    printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
-           pc, address, is_write, *(unsigned long *)old_set);
-#endif
-    /* XXX: locking issue */
-    if (is_write && page_unprotect(address, pc, puc)) {
-        return 1;
-    }
-    /* see if it is an MMU fault */
-    ret = cpu_m68k_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
-    if (ret < 0)
-        return 0; /* not an MMU fault */
-    if (ret == 0)
-        return 1; /* the MMU fault was handled without causing real CPU fault */
-    /* now we have a real cpu fault */
-    tb = tb_find_pc(pc);
-    if (tb) {
-        /* the PC is inside the translated code. It means that we have
-           a virtual CPU fault */
-        cpu_restore_state(tb, env, pc, puc);
-    }
-    /* we restore the process signal mask as the sigreturn should
-       do it (XXX: use sigsetjmp) */
-    sigprocmask(SIG_SETMASK, old_set, NULL);
-    cpu_loop_exit();
     /* never comes here */
     return 1;
 }
 
-#elif defined (TARGET_MIPS)
-static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
-                                    int is_write, sigset_t *old_set,
-                                    void *puc)
-{
-    TranslationBlock *tb;
-    int ret;
-
-    if (cpu_single_env)
-        env = cpu_single_env; /* XXX: find a correct solution for multithread */
-#if defined(DEBUG_SIGNAL)
-    printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
-           pc, address, is_write, *(unsigned long *)old_set);
-#endif
-    /* XXX: locking issue */
-    if (is_write && page_unprotect(h2g(address), pc, puc)) {
-        return 1;
-    }
-
-    /* see if it is an MMU fault */
-    ret = cpu_mips_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
-    if (ret < 0)
-        return 0; /* not an MMU fault */
-    if (ret == 0)
-        return 1; /* the MMU fault was handled without causing real CPU fault */
-
-    /* now we have a real cpu fault */
-    tb = tb_find_pc(pc);
-    if (tb) {
-        /* the PC is inside the translated code. It means that we have
-           a virtual CPU fault */
-        cpu_restore_state(tb, env, pc, puc);
-    }
-    if (ret == 1) {
-#if 0
-        printf("PF exception: PC=0x" TARGET_FMT_lx " error=0x%x %p\n",
-               env->PC, env->error_code, tb);
-#endif
-    /* we restore the process signal mask as the sigreturn should
-       do it (XXX: use sigsetjmp) */
-        sigprocmask(SIG_SETMASK, old_set, NULL);
-        cpu_loop_exit();
-    } else {
-        /* activate soft MMU for this block */
-        cpu_resume_from_signal(env, puc);
-    }
-    /* never comes here */
-    return 1;
-}
-
-#elif defined (TARGET_MICROBLAZE)
-static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
-                                    int is_write, sigset_t *old_set,
-                                    void *puc)
-{
-    TranslationBlock *tb;
-    int ret;
-
-    if (cpu_single_env)
-        env = cpu_single_env; /* XXX: find a correct solution for multithread */
-#if defined(DEBUG_SIGNAL)
-    printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
-           pc, address, is_write, *(unsigned long *)old_set);
-#endif
-    /* XXX: locking issue */
-    if (is_write && page_unprotect(h2g(address), pc, puc)) {
-        return 1;
-    }
-
-    /* see if it is an MMU fault */
-    ret = cpu_mb_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
-    if (ret < 0)
-        return 0; /* not an MMU fault */
-    if (ret == 0)
-        return 1; /* the MMU fault was handled without causing real CPU fault */
-
-    /* now we have a real cpu fault */
-    tb = tb_find_pc(pc);
-    if (tb) {
-        /* the PC is inside the translated code. It means that we have
-           a virtual CPU fault */
-        cpu_restore_state(tb, env, pc, puc);
-    }
-    if (ret == 1) {
-#if 0
-        printf("PF exception: PC=0x" TARGET_FMT_lx " error=0x%x %p\n",
-               env->PC, env->error_code, tb);
-#endif
-    /* we restore the process signal mask as the sigreturn should
-       do it (XXX: use sigsetjmp) */
-        sigprocmask(SIG_SETMASK, old_set, NULL);
-        cpu_loop_exit();
-    } else {
-        /* activate soft MMU for this block */
-        cpu_resume_from_signal(env, puc);
-    }
-    /* never comes here */
-    return 1;
-}
-
-#elif defined (TARGET_SH4)
-static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
-                                    int is_write, sigset_t *old_set,
-                                    void *puc)
-{
-    TranslationBlock *tb;
-    int ret;
-
-    if (cpu_single_env)
-        env = cpu_single_env; /* XXX: find a correct solution for multithread */
-#if defined(DEBUG_SIGNAL)
-    printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
-           pc, address, is_write, *(unsigned long *)old_set);
-#endif
-    /* XXX: locking issue */
-    if (is_write && page_unprotect(h2g(address), pc, puc)) {
-        return 1;
-    }
-
-    /* see if it is an MMU fault */
-    ret = cpu_sh4_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
-    if (ret < 0)
-        return 0; /* not an MMU fault */
-    if (ret == 0)
-        return 1; /* the MMU fault was handled without causing real CPU fault */
-
-    /* now we have a real cpu fault */
-    tb = tb_find_pc(pc);
-    if (tb) {
-        /* the PC is inside the translated code. It means that we have
-           a virtual CPU fault */
-        cpu_restore_state(tb, env, pc, puc);
-    }
-#if 0
-        printf("PF exception: NIP=0x%08x error=0x%x %p\n",
-               env->nip, env->error_code, tb);
-#endif
-    /* we restore the process signal mask as the sigreturn should
-       do it (XXX: use sigsetjmp) */
-    sigprocmask(SIG_SETMASK, old_set, NULL);
-    cpu_loop_exit();
-    /* never comes here */
-    return 1;
-}
-
-#elif defined (TARGET_ALPHA)
-static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
-                                    int is_write, sigset_t *old_set,
-                                    void *puc)
-{
-    TranslationBlock *tb;
-    int ret;
-
-    if (cpu_single_env)
-        env = cpu_single_env; /* XXX: find a correct solution for multithread */
-#if defined(DEBUG_SIGNAL)
-    printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
-           pc, address, is_write, *(unsigned long *)old_set);
-#endif
-    /* XXX: locking issue */
-    if (is_write && page_unprotect(h2g(address), pc, puc)) {
-        return 1;
-    }
-
-    /* see if it is an MMU fault */
-    ret = cpu_alpha_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
-    if (ret < 0)
-        return 0; /* not an MMU fault */
-    if (ret == 0)
-        return 1; /* the MMU fault was handled without causing real CPU fault */
-
-    /* now we have a real cpu fault */
-    tb = tb_find_pc(pc);
-    if (tb) {
-        /* the PC is inside the translated code. It means that we have
-           a virtual CPU fault */
-        cpu_restore_state(tb, env, pc, puc);
-    }
-#if 0
-        printf("PF exception: NIP=0x%08x error=0x%x %p\n",
-               env->nip, env->error_code, tb);
-#endif
-    /* we restore the process signal mask as the sigreturn should
-       do it (XXX: use sigsetjmp) */
-    sigprocmask(SIG_SETMASK, old_set, NULL);
-    cpu_loop_exit();
-    /* never comes here */
-    return 1;
-}
-#elif defined (TARGET_CRIS)
-static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
-                                    int is_write, sigset_t *old_set,
-                                    void *puc)
-{
-    TranslationBlock *tb;
-    int ret;
-
-    if (cpu_single_env)
-        env = cpu_single_env; /* XXX: find a correct solution for multithread */
-#if defined(DEBUG_SIGNAL)
-    printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
-           pc, address, is_write, *(unsigned long *)old_set);
-#endif
-    /* XXX: locking issue */
-    if (is_write && page_unprotect(h2g(address), pc, puc)) {
-        return 1;
-    }
-
-    /* see if it is an MMU fault */
-    ret = cpu_cris_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
-    if (ret < 0)
-        return 0; /* not an MMU fault */
-    if (ret == 0)
-        return 1; /* the MMU fault was handled without causing real CPU fault */
-
-    /* now we have a real cpu fault */
-    tb = tb_find_pc(pc);
-    if (tb) {
-        /* the PC is inside the translated code. It means that we have
-           a virtual CPU fault */
-        cpu_restore_state(tb, env, pc, puc);
-    }
-    /* we restore the process signal mask as the sigreturn should
-       do it (XXX: use sigsetjmp) */
-    sigprocmask(SIG_SETMASK, old_set, NULL);
-    cpu_loop_exit();
-    /* never comes here */
-    return 1;
-}
-
-#else
-#error unsupported target CPU
-#endif
-
 #if defined(__i386__)
 
 #if defined(__APPLE__)
diff --git a/target-alpha/cpu.h b/target-alpha/cpu.h
index 975d65b657..ca9dfe2458 100644
--- a/target-alpha/cpu.h
+++ b/target-alpha/cpu.h
@@ -433,6 +433,7 @@ int cpu_alpha_signal_handler(int host_signum, void *pinfo,
                              void *puc);
 int cpu_alpha_handle_mmu_fault (CPUState *env, uint64_t address, int rw,
                                 int mmu_idx, int is_softmmu);
+#define cpu_handle_mmu_fault cpu_alpha_handle_mmu_fault
 void do_interrupt (CPUState *env);
 
 int cpu_alpha_mfpr (CPUState *env, int iprn, uint64_t *valp);
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index afc2bfebb4..257e7aa705 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -220,6 +220,7 @@ int cpu_arm_signal_handler(int host_signum, void *pinfo,
                            void *puc);
 int cpu_arm_handle_mmu_fault (CPUARMState *env, target_ulong address, int rw,
                               int mmu_idx, int is_softmuu);
+#define cpu_handle_mmu_fault cpu_arm_handle_mmu_fault
 
 void cpu_lock(void);
 void cpu_unlock(void);
diff --git a/target-cris/cpu.h b/target-cris/cpu.h
index 5717fa7800..0626cd8dd9 100644
--- a/target-cris/cpu.h
+++ b/target-cris/cpu.h
@@ -213,6 +213,7 @@ static inline int cpu_mmu_index (CPUState *env)
 
 int cpu_cris_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
                               int mmu_idx, int is_softmmu);
+#define cpu_handle_mmu_fault cpu_cris_handle_mmu_fault
 
 #if defined(CONFIG_USER_ONLY)
 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index d4274ea24a..b9a6392cf1 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -799,6 +799,7 @@ int cpu_x86_signal_handler(int host_signum, void *pinfo,
 /* helper.c */
 int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,
                              int is_write, int mmu_idx, int is_softmmu);
+#define cpu_handle_mmu_fault cpu_x86_handle_mmu_fault
 void cpu_x86_set_a20(CPUX86State *env, int a20_state);
 void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
                    uint32_t *eax, uint32_t *ebx,
diff --git a/target-m68k/cpu.h b/target-m68k/cpu.h
index d071a0bbd4..68a7e41bc9 100644
--- a/target-m68k/cpu.h
+++ b/target-m68k/cpu.h
@@ -227,6 +227,7 @@ static inline int cpu_mmu_index (CPUState *env)
 
 int cpu_m68k_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
                               int mmu_idx, int is_softmmu);
+#define cpu_handle_mmu_fault cpu_m68k_handle_mmu_fault
 
 #if defined(CONFIG_USER_ONLY)
 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
diff --git a/target-microblaze/cpu.h b/target-microblaze/cpu.h
index 436bcd2ca9..a1c1a99ce1 100644
--- a/target-microblaze/cpu.h
+++ b/target-microblaze/cpu.h
@@ -268,6 +268,7 @@ static inline int cpu_mmu_index (CPUState *env)
 
 int cpu_mb_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
                             int mmu_idx, int is_softmmu);
+#define cpu_handle_mmu_fault cpu_mb_handle_mmu_fault
 
 #if defined(CONFIG_USER_ONLY)
 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
diff --git a/target-mips/cpu.h b/target-mips/cpu.h
index 789176b7a0..c27738ac47 100644
--- a/target-mips/cpu.h
+++ b/target-mips/cpu.h
@@ -584,6 +584,7 @@ void cpu_mips_update_irq (CPUState *env);
 /* helper.c */
 int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
                                int mmu_idx, int is_softmmu);
+#define cpu_handle_mmu_fault cpu_mips_handle_mmu_fault
 void do_interrupt (CPUState *env);
 void r4k_invalidate_tlb (CPUState *env, int idx, int use_extra);
 
diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 420ea869a0..27f523f6f3 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -706,6 +706,7 @@ int cpu_ppc_signal_handler (int host_signum, void *pinfo,
                             void *puc);
 int cpu_ppc_handle_mmu_fault (CPUPPCState *env, target_ulong address, int rw,
                               int mmu_idx, int is_softmmu);
+#define cpu_handle_mmu_fault cpu_ppc_handle_mmu_fault
 int get_physical_address (CPUPPCState *env, mmu_ctx_t *ctx, target_ulong vaddr,
                           int rw, int access_type);
 void do_interrupt (CPUPPCState *env);
diff --git a/target-sh4/cpu.h b/target-sh4/cpu.h
index 91c080fd8f..366e7986ed 100644
--- a/target-sh4/cpu.h
+++ b/target-sh4/cpu.h
@@ -163,6 +163,7 @@ int cpu_sh4_signal_handler(int host_signum, void *pinfo,
                            void *puc);
 int cpu_sh4_handle_mmu_fault(CPUSH4State * env, target_ulong address, int rw,
 			     int mmu_idx, int is_softmmu);
+#define cpu_handle_mmu_fault cpu_sh4_handle_mmu_fault
 void do_interrupt(CPUSH4State * env);
 
 void sh4_cpu_list(FILE *f, int (*cpu_fprintf)(FILE *f, const char *fmt, ...));
diff --git a/target-sparc/cpu.h b/target-sparc/cpu.h
index 6654eca491..63aead954b 100644
--- a/target-sparc/cpu.h
+++ b/target-sparc/cpu.h
@@ -413,6 +413,7 @@ void cpu_lock(void);
 void cpu_unlock(void);
 int cpu_sparc_handle_mmu_fault(CPUSPARCState *env1, target_ulong address, int rw,
                                int mmu_idx, int is_softmmu);
+#define cpu_handle_mmu_fault cpu_sparc_handle_mmu_fault
 target_ulong mmu_probe(CPUSPARCState *env, target_ulong address, int mmulev);
 void dump_mmu(CPUSPARCState *env);