signal/all: remove return value from restore_sigcontext

make most implementations of restore_sigcontext void and
remove checking it's return value from functions calling
restore_sigcontext.

The exception is the X86 version of the function that is
too different from others to deal in this way, and arm
version, to keep possibility of erroring out from failed
valid_user_regs.

v3: keep arm valid_user_regs for filling in near future.
Signed-off-by: NRiku Voipio <riku.voipio@linaro.org>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>

linux-user/signal.c

@@ -2889,10 +2889,9 @@ static inline void setup_sigcontext(CPUMIPSState *regs,
     }
 }
 
-static inline int
+static inline void
 restore_sigcontext(CPUMIPSState *regs, struct target_sigcontext *sc)
 {
-    int err = 0;
     int i;
 
     __get_user(regs->CP0_EPC, &sc->sc_pc);
@@ -2919,8 +2918,6 @@ restore_sigcontext(CPUMIPSState *regs, struct target_sigcontext *sc)
     for (i = 0; i < 32; ++i) {
         __get_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]);
     }
-
-    return err;
 }
 
 /*
@@ -3031,8 +3028,7 @@ long do_sigreturn(CPUMIPSState *regs)
     target_to_host_sigset_internal(&blocked, &target_set);
     do_sigprocmask(SIG_SETMASK, &blocked, NULL);
 
-    if (restore_sigcontext(regs, &frame->sf_sc))
-   	goto badframe;
+    restore_sigcontext(regs, &frame->sf_sc);
 
 #if 0
     /*
@@ -3135,8 +3131,7 @@ long do_rt_sigreturn(CPUMIPSState *env)
     target_to_host_sigset(&blocked, &frame->rs_uc.tuc_sigmask);
     do_sigprocmask(SIG_SETMASK, &blocked, NULL);
 
-    if (restore_sigcontext(env, &frame->rs_uc.tuc_mcontext))
-        goto badframe;
+    restore_sigcontext(env, &frame->rs_uc.tuc_mcontext);
 
     if (do_sigaltstack(frame_addr +
 		       offsetof(struct target_rt_sigframe, rs_uc.tuc_stack),
@@ -3249,10 +3244,9 @@ static void setup_sigcontext(struct target_sigcontext *sc,
     __put_user(mask, &sc->oldmask);
 }
 
-static int restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc,
+static void restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc,
                               target_ulong *r0_p)
 {
-    unsigned int err = 0;
     int i;
 
 #define COPY(x)         __get_user(regs->x, &sc->sc_##x)
@@ -3277,7 +3271,6 @@ static int restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc,
 
     regs->tra = -1;         /* disable syscall checks */
     __get_user(*r0_p, &sc->sc_gregs[0]);
-    return err;
 }
 
 static void setup_frame(int sig, struct target_sigaction *ka,
@@ -3422,8 +3415,7 @@ long do_sigreturn(CPUSH4State *regs)
     target_to_host_sigset_internal(&blocked, &target_set);
     do_sigprocmask(SIG_SETMASK, &blocked, NULL);
 
-    if (restore_sigcontext(regs, &frame->sc, &r0))
-        goto badframe;
+    restore_sigcontext(regs, &frame->sc, &r0);
 
     unlock_user_struct(frame, frame_addr, 0);
     return r0;
@@ -3451,8 +3443,7 @@ long do_rt_sigreturn(CPUSH4State *regs)
     target_to_host_sigset(&blocked, &frame->uc.tuc_sigmask);
     do_sigprocmask(SIG_SETMASK, &blocked, NULL);
 
-    if (restore_sigcontext(regs, &frame->uc.tuc_mcontext, &r0))
-        goto badframe;
+    restore_sigcontext(regs, &frame->uc.tuc_mcontext, &r0);
 
     if (do_sigaltstack(frame_addr +
 		       offsetof(struct target_rt_sigframe, uc.tuc_stack),
@@ -5086,10 +5077,9 @@ static void setup_sigcontext(struct target_sigcontext *sc, CPUM68KState *env,
     __put_user(env->pc, &sc->sc_pc);
 }
 
-static int
+static void
 restore_sigcontext(CPUM68KState *env, struct target_sigcontext *sc, int *pd0)
 {
-    int err = 0;
     int temp;
 
     __get_user(env->aregs[7], &sc->sc_usp);
@@ -5101,8 +5091,6 @@ restore_sigcontext(CPUM68KState *env, struct target_sigcontext *sc, int *pd0)
     env->sr = (env->sr & 0xff00) | (temp & 0xff);
 
     *pd0 = tswapl(sc->sc_d0);
-
-    return err;
 }
 
 /*
@@ -5342,8 +5330,7 @@ long do_sigreturn(CPUM68KState *env)
 
     /* restore registers */
 
-    if (restore_sigcontext(env, &frame->sc, &d0))
-        goto badframe;
+    restore_sigcontext(env, &frame->sc, &d0);
 
     unlock_user_struct(frame, frame_addr, 0);
     return d0;
@@ -5461,11 +5448,11 @@ static void setup_sigcontext(struct target_sigcontext *sc, CPUAlphaState *env,
     __put_user(0, &sc->sc_traparg_a2); /* FIXME */
 }
 
-static int restore_sigcontext(CPUAlphaState *env,
+static void restore_sigcontext(CPUAlphaState *env,
                               struct target_sigcontext *sc)
 {
     uint64_t fpcr;
-    int i, err = 0;
+    int i;
 
     __get_user(env->pc, &sc->sc_pc);
 
@@ -5478,8 +5465,6 @@ static int restore_sigcontext(CPUAlphaState *env,
 
     __get_user(fpcr, &sc->sc_fpcr);
     cpu_alpha_store_fpcr(env, fpcr);
-
-    return err;
 }
 
 static inline abi_ulong get_sigframe(struct target_sigaction *sa,
@@ -5613,9 +5598,7 @@ long do_sigreturn(CPUAlphaState *env)
     target_to_host_sigset_internal(&set, &target_set);
     do_sigprocmask(SIG_SETMASK, &set, NULL);
 
-    if (restore_sigcontext(env, sc)) {
-        goto badframe;
-    }
+    restore_sigcontext(env, sc);
     unlock_user_struct(sc, sc_addr, 0);
     return env->ir[IR_V0];
 
@@ -5636,9 +5619,7 @@ long do_rt_sigreturn(CPUAlphaState *env)
     target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
     do_sigprocmask(SIG_SETMASK, &set, NULL);
 
-    if (restore_sigcontext(env, &frame->uc.tuc_mcontext)) {
-        goto badframe;
-    }
+    restore_sigcontext(env, &frame->uc.tuc_mcontext);
     if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
                                              uc.tuc_stack),
                        0, env->ir[IR_SP]) == -EFAULT) {