microblaze: switch to generic sigaltstack

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

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index ba3b7c8..5e30d75 100644 (file)
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -27,6 +27,7 @@ config MICROBLAZE
        select GENERIC_CLOCKEVENTS
        select MODULES_USE_ELF_RELA
        select CLONE_BACKWARDS
+       select GENERIC_SIGALTSTACK
 
 config SWAP
        def_bool n

diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c
index ac3d0a0..dfd61e2 100644 (file)
--- a/arch/microblaze/kernel/signal.c
+++ b/arch/microblaze/kernel/signal.c
@@ -41,13 +41,6 @@
 #include <asm/cacheflush.h>
 #include <asm/syscalls.h>
 
-asmlinkage long
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
-               struct pt_regs *regs)
-{
-       return do_sigaltstack(uss, uoss, regs->r1);
-}
-
 /*
  * Do a signal return; undo the signal stack.
  */
@@ -109,9 +102,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
        if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval))
                goto badframe;
 
-       /* It is more difficult to avoid calling this function than to
-        call it and ignore errors. */
-       if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->r1) == -EFAULT)
+       if (restore_altstack(&frame->uc.uc_stack))
                goto badframe;
 
        return rval;
@@ -194,11 +185,7 @@ 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 __user *)current->sas_ss_sp,
-                       &frame->uc.uc_stack.ss_sp);
-       err |= __put_user(sas_ss_flags(regs->r1),
-                       &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->r1);
        err |= setup_sigcontext(&frame->uc.uc_mcontext,
                        regs, set->sig[0]);
        err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));