mips: switch to generic sigaltstack

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

1 files changed, 3 insertions, 18 deletions

diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index 4d790d1f03d6..eab30865b2bd 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -313,15 +313,6 @@ SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
 }
 #endif
 
-asmlinkage int sys_sigaltstack(nabi_no_regargs 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[29];
-
-        return do_sigaltstack(uss, uoss, usp);
-}
-
 #ifdef CONFIG_TRAD_SIGNALS
 asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs)
 {
@@ -378,9 +369,8 @@ asmlinkage void sys_rt_sigreturn(nabi_no_regargs 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.  */
-        do_sigaltstack(&frame->rs_uc.uc_stack, NULL, regs.regs[29]);
+        if (restore_altstack(&frame->rs_uc.uc_stack))
+                goto badframe;
 
         /*
          * Don't let your children do this ...
@@ -457,12 +447,7 @@ static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
         /* Create the ucontext.  */
         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[29]),
-                          &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[29]);
         err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
         err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));