score: switch to generic sigaltstack

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 3 insertions, 25 deletions

diff --git a/arch/score/Kconfig b/arch/score/Kconfig
index 3b1482e7afac..a125d7207bcc 100644
--- a/arch/score/Kconfig
+++ b/arch/score/Kconfig
@@ -14,6 +14,7 @@ config SCORE
        select HAVE_MOD_ARCH_SPECIFIC
         select MODULES_USE_ELF_REL
         select CLONE_BACKWARDS
+        select GENERIC_SIGALTSTACK
 
 choice
         prompt "System type"
diff --git a/arch/score/include/asm/syscalls.h b/arch/score/include/asm/syscalls.h
index acaeed680956..98d1df92fbd1 100644
--- a/arch/score/include/asm/syscalls.h
+++ b/arch/score/include/asm/syscalls.h
@@ -1,7 +1,6 @@
 #ifndef _ASM_SCORE_SYSCALLS_H
 #define _ASM_SCORE_SYSCALLS_H
 
-asmlinkage long score_sigaltstack(struct pt_regs *regs);
 asmlinkage long score_rt_sigreturn(struct pt_regs *regs);
 
 #include <asm-generic/syscalls.h>
diff --git a/arch/score/kernel/entry.S b/arch/score/kernel/entry.S
index 1557ca1a2951..7234ed09b7b7 100644
--- a/arch/score/kernel/entry.S
+++ b/arch/score/kernel/entry.S
@@ -491,8 +491,3 @@ ENTRY(sys_rt_sigreturn)
         mv      r4, r0
         la      r8, score_rt_sigreturn
         br      r8
-
-ENTRY(sys_sigaltstack)
-        mv      r4, r0
-        la      r8, score_sigaltstack
-        br      r8
diff --git a/arch/score/kernel/signal.c b/arch/score/kernel/signal.c
index 02353bde92d8..a00fba32b0eb 100644
--- a/arch/score/kernel/signal.c
+++ b/arch/score/kernel/signal.c
@@ -134,16 +134,6 @@ static void __user *get_sigframe(struct k_sigaction *ka,
 }
 
 asmlinkage long
-score_sigaltstack(struct pt_regs *regs)
-{
-        const stack_t __user *uss = (const stack_t __user *) regs->regs[4];
-        stack_t __user *uoss = (stack_t __user *) regs->regs[5];
-        unsigned long usp = regs->regs[0];
-
-        return do_sigaltstack(uss, uoss, usp);
-}
-
-asmlinkage long
 score_rt_sigreturn(struct pt_regs *regs)
 {
         struct rt_sigframe __user *frame;
@@ -167,9 +157,7 @@ score_rt_sigreturn(struct pt_regs *regs)
         else if (sig)
                 force_sig(sig, current);
 
-        /* It is more difficult to avoid calling this function than to
-           call it and ignore errors.  */
-        if (do_sigaltstack(&frame->rs_uc.uc_stack, NULL, regs->regs[0]) == -EFAULT)
+        if (restore_altstack(&frame->rs_uc.uc_stack))
                 goto badframe;
         regs->is_syscall = 0;
 
@@ -209,12 +197,7 @@ static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
         err |= copy_siginfo_to_user(&frame->rs_info, info);
         err |= __put_user(0, &frame->rs_uc.uc_flags);
         err |= __put_user(NULL, &frame->rs_uc.uc_link);
-        err |= __put_user((void __user *)current->sas_ss_sp,
-                                &frame->rs_uc.uc_stack.ss_sp);
-        err |= __put_user(sas_ss_flags(regs->regs[0]),
-                                &frame->rs_uc.uc_stack.ss_flags);
-        err |= __put_user(current->sas_ss_size,
-                                &frame->rs_uc.uc_stack.ss_size);
+        err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[0]);
         err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
         err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));