sh: switch to generic sigaltstack

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

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index babc2b8..fb4a212 100644 (file)
--- 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 cc25485..77e2054 100644 (file)
--- 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 2f1f653..e540d07 100644 (file)
--- 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 d867cd9..0fba66e 100644 (file)
--- 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));