4 files changed, 5 insertions, 38 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index babc2b826c5c..fb4a212c1bc4 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -40,6 +40,7 @@ config SUPERH
         select GENERIC_STRNLEN_USER
         select HAVE_MOD_ARCH_SPECIFIC if DWARF_UNWINDER
         select MODULES_USE_ELF_RELA
+        select GENERIC_SIGALTSTACK
         help
           The SuperH is a RISC processor targeted for use in embedded systems
           and consumer electronics; it was also used in the Sega Dreamcast
diff --git a/arch/sh/include/asm/syscalls_32.h b/arch/sh/include/asm/syscalls_32.h
index cc25485996bb..77e2054d678e 100644
--- a/arch/sh/include/asm/syscalls_32.h
+++ b/arch/sh/include/asm/syscalls_32.h
@@ -12,9 +12,6 @@ struct pt_regs;
 asmlinkage int sys_sigsuspend(old_sigset_t mask);
 asmlinkage int sys_sigaction(int sig, const struct old_sigaction __user *act,
                              struct old_sigaction __user *oact);
-asmlinkage int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
-                               unsigned long r6, unsigned long r7,
-                               struct pt_regs __regs);
 asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
                              unsigned long r6, unsigned long r7,
                              struct pt_regs __regs);
diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index 2f1f65356c0c..e540d07dd5c5 100644
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -89,17 +89,6 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
         return ret;
 }
 
-asmlinkage int
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
-                unsigned long r6, unsigned long r7,
-                struct pt_regs __regs)
-{
-        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-
-        return do_sigaltstack(uss, uoss, regs->regs[15]);
-}
-
-
 /*
  * Do a signal return; undo the signal stack.
  */
@@ -257,8 +246,7 @@ asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
         if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
                 goto badframe;
 
-        if (do_sigaltstack(&frame->uc.uc_stack, NULL,
-                           regs->regs[15]) == -EFAULT)
+        if (restore_altstack(&frame->uc.uc_stack))
                 goto badframe;
 
         return r0;
@@ -423,11 +411,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
         /* Create the ucontext.  */
         err |= __put_user(0, &frame->uc.uc_flags);
         err |= __put_user(NULL, &frame->uc.uc_link);
-        err |= __put_user((void *)current->sas_ss_sp,
-                          &frame->uc.uc_stack.ss_sp);
-        err |= __put_user(sas_ss_flags(regs->regs[15]),
-                          &frame->uc.uc_stack.ss_flags);
-        err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+        err |= __save_altstack(&frame->uc.uc_stack, regs->regs[15]);
         err |= setup_sigcontext(&frame->uc.uc_mcontext,
                                 regs, set->sig[0]);
         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c
index d867cd95a622..0fba66e2b202 100644
--- a/arch/sh/kernel/signal_64.c
+++ b/arch/sh/kernel/signal_64.c
@@ -170,15 +170,6 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
         return ret;
 }
 
-asmlinkage int
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
-                unsigned long r4, unsigned long r5, unsigned long r6,
-                unsigned long r7,
-                struct pt_regs * regs)
-{
-        return do_sigaltstack(uss, uoss, REF_REG_SP);
-}
-
 /*
  * Do a signal return; undo the signal stack.
  */
@@ -364,9 +355,7 @@ asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3,
                 goto badframe;
         regs->pc -= 4;
 
-        /* It is more difficult to avoid calling this function than to
-           call it and ignore errors.  */
-        if (do_sigaltstack(&frame->uc.uc_stack, NULL, REF_REG_SP) == -EFAULT)
+        if (restore_altstack(&frame->uc.uc_stack))
                 goto badframe;
 
         return (int) ret;
@@ -560,11 +549,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
         /* Create the ucontext.  */
         err |= __put_user(0, &frame->uc.uc_flags);
         err |= __put_user(0, &frame->uc.uc_link);
-        err |= __put_user((void *)current->sas_ss_sp,
-                          &frame->uc.uc_stack.ss_sp);
-        err |= __put_user(sas_ss_flags(regs->regs[REG_SP]),
-                          &frame->uc.uc_stack.ss_flags);
-        err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+        err |= __save_altstack(&frame->uc.uc_stack, regs->regs[REG_SP]);
         err |= setup_sigcontext(&frame->uc.uc_mcontext,
                                 regs, set->sig[0]);
         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));