target/nios2: Remove nios2_cpu_record_sigsegv

Since f5ef0e51, we have a real page mapped for kuser,
which means the special casing for SIGSEGV can go away.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220421151735.31996-11-richard.henderson@linaro.org>

linux-user/nios2/cpu_loop.c

@@ -126,16 +126,6 @@ void cpu_loop(CPUNios2State *env)
             info.si_code = TARGET_TRAP_BRKPT;
             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
             break;
-        case 0xaa:
-            {
-                info.si_signo = TARGET_SIGSEGV;
-                info.si_errno = 0;
-                /* TODO: check env->error_code */
-                info.si_code = TARGET_SEGV_MAPERR;
-                info._sifields._sigfault._addr = env->regs[R_PC];
-                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
-            }
-            break;
         default:
             EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
                      trapnr);

target/nios2/cpu.c

@@ -210,9 +210,7 @@ static const struct SysemuCPUOps nios2_sysemu_ops = {
 static const struct TCGCPUOps nios2_tcg_ops = {
     .initialize = nios2_tcg_init,
 
-#ifdef CONFIG_USER_ONLY
-    .record_sigsegv = nios2_cpu_record_sigsegv,
-#else
+#ifndef CONFIG_USER_ONLY
     .tlb_fill = nios2_cpu_tlb_fill,
     .cpu_exec_interrupt = nios2_cpu_exec_interrupt,
     .do_interrupt = nios2_cpu_do_interrupt,

target/nios2/cpu.h

@@ -216,11 +216,7 @@ static inline int cpu_mmu_index(CPUNios2State *env, bool ifetch)
                                                   MMU_SUPERVISOR_IDX;
 }
 
-#ifdef CONFIG_USER_ONLY
-void nios2_cpu_record_sigsegv(CPUState *cpu, vaddr addr,
-                              MMUAccessType access_type,
-                              bool maperr, uintptr_t ra);
-#else
+#ifndef CONFIG_USER_ONLY
 bool nios2_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
                         MMUAccessType access_type, int mmu_idx,
                         bool probe, uintptr_t retaddr);

target/nios2/helper.c

@@ -28,19 +28,7 @@
 #include "exec/helper-proto.h"
 #include "semihosting/semihost.h"
 
-#if defined(CONFIG_USER_ONLY)
-
-void nios2_cpu_record_sigsegv(CPUState *cs, vaddr addr,
-                              MMUAccessType access_type,
-                              bool maperr, uintptr_t retaddr)
-{
-    /* FIXME: Disentangle kuser page from linux-user sigsegv handling. */
-    cs->exception_index = 0xaa;
-    cpu_loop_exit_restore(cs, retaddr);
-}
-
-#else /* !CONFIG_USER_ONLY */
-
+#if !defined(CONFIG_USER_ONLY)
 void nios2_cpu_do_interrupt(CPUState *cs)
 {
     Nios2CPU *cpu = NIOS2_CPU(cs);