avr32: switch to generic sigaltstack

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

4 files changed, 4 insertions, 20 deletions

diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index 2ae6591b3a55..e888b72b6e10 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -17,6 +17,7 @@ config AVR32
         select GENERIC_CLOCKEVENTS
         select HAVE_MOD_ARCH_SPECIFIC
         select MODULES_USE_ELF_RELA
+        select GENERIC_SIGALTSTACK
         help
           AVR32 is a high-performance 32-bit RISC microprocessor core,
           designed for cost-sensitive embedded applications, with particular
diff --git a/arch/avr32/kernel/signal.c b/arch/avr32/kernel/signal.c
index 5e01c3a40ced..b80c0b3d2bab 100644
--- a/arch/avr32/kernel/signal.c
+++ b/arch/avr32/kernel/signal.c
@@ -21,12 +21,6 @@
 #include <asm/ucontext.h>
 #include <asm/syscalls.h>
 
-asmlinkage int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
-                               struct pt_regs *regs)
-{
-        return do_sigaltstack(uss, uoss, regs->sp);
-}
-
 struct rt_sigframe
 {
         struct siginfo info;
@@ -91,7 +85,7 @@ asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
         if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
                 goto badframe;
 
-        if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
+        if (restore_altstack(&frame->uc.uc_stack))
                 goto badframe;
 
         pr_debug("Context restored: pc = %08lx, lr = %08lx, sp = %08lx\n",
@@ -175,12 +169,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
         /* Set up 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->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->sp);
         err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
diff --git a/arch/avr32/kernel/syscall-stubs.S b/arch/avr32/kernel/syscall-stubs.S
index 275aab9731fd..b5fc927cd398 100644
--- a/arch/avr32/kernel/syscall-stubs.S
+++ b/arch/avr32/kernel/syscall-stubs.S
@@ -20,12 +20,6 @@ __sys_rt_sigsuspend:
         mov     r10, sp
         rjmp    sys_rt_sigsuspend
 
-        .global __sys_sigaltstack
-        .type   __sys_sigaltstack,@function
-__sys_sigaltstack:
-        mov     r10, sp
-        rjmp    sys_sigaltstack
-
         .global __sys_rt_sigreturn
         .type   __sys_rt_sigreturn,@function
 __sys_rt_sigreturn:
diff --git a/arch/avr32/kernel/syscall_table.S b/arch/avr32/kernel/syscall_table.S
index f27bb878da6b..017a904180c8 100644
--- a/arch/avr32/kernel/syscall_table.S
+++ b/arch/avr32/kernel/syscall_table.S
@@ -115,7 +115,7 @@ sys_call_table:
         .long   sys_statfs
         .long   sys_fstatfs             /* 100 */
         .long   sys_vhangup
-        .long   __sys_sigaltstack
+        .long   sys_sigaltstack
         .long   sys_syslog
         .long   sys_setitimer
         .long   sys_getitimer           /* 105 */