Merge branch 'master' into devel

[lisovros/linux_canprio.git] / arch / arm / kernel / signal.c

diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index f6bc5d442782374bb99618702722dde5d37e1dc2..f7194e44d5a9d799ceab0a5dc6f06432561c5a80 100644 (file)
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -47,57 +47,22 @@ const unsigned long sigreturn_codes[7] = {
        MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
 };
 
-static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall);
-
 /*
  * atomically swap in the new signal mask, and wait for a signal.
  */
-asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs)
+asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask)
 {
-       sigset_t saveset;
-
        mask &= _BLOCKABLE;
        spin_lock_irq(&current->sighand->siglock);
-       saveset = current->blocked;
+       current->saved_sigmask = current->blocked;
        siginitset(&current->blocked, mask);
        recalc_sigpending();
        spin_unlock_irq(&current->sighand->siglock);
-       regs->ARM_r0 = -EINTR;
-
-       while (1) {
-               current->state = TASK_INTERRUPTIBLE;
-               schedule();
-               if (do_signal(&saveset, regs, 0))
-                       return regs->ARM_r0;
-       }
-}
-
-asmlinkage int
-sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs)
-{
-       sigset_t saveset, newset;
-
-       /* XXX: Don't preclude handling different sized sigset_t's. */
-       if (sigsetsize != sizeof(sigset_t))
-               return -EINVAL;
-
-       if (copy_from_user(&newset, unewset, sizeof(newset)))
-               return -EFAULT;
-       sigdelsetmask(&newset, ~_BLOCKABLE);
-
-       spin_lock_irq(&current->sighand->siglock);
-       saveset = current->blocked;
-       current->blocked = newset;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
-       regs->ARM_r0 = -EINTR;
 
-       while (1) {
-               current->state = TASK_INTERRUPTIBLE;
-               schedule();
-               if (do_signal(&saveset, regs, 0))
-                       return regs->ARM_r0;
-       }
+       current->state = TASK_INTERRUPTIBLE;
+       schedule();
+       set_restore_sigmask();
+       return -ERESTARTNOHAND;
 }
 
 asmlinkage int 
@@ -545,7 +510,7 @@ static inline void setup_syscall_restart(struct pt_regs *regs)
 /*
  * OK, we're invoking a handler
  */    
-static void
+static int
 handle_signal(unsigned long sig, struct k_sigaction *ka,
              siginfo_t *info, sigset_t *oldset,
              struct pt_regs * regs, int syscall)
@@ -596,7 +561,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
 
        if (ret != 0) {
                force_sigsegv(sig, tsk);
-               return;
+               return ret;
        }
 
        /*
@@ -610,6 +575,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
        recalc_sigpending();
        spin_unlock_irq(&tsk->sighand->siglock);
 
+       return 0;
 }
 
 /*
@@ -621,7 +587,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
  * the kernel can handle, and then we build all the user-level signal handling
  * stack-frames in one go after that.
  */
-static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
+static void do_signal(struct pt_regs *regs, int syscall)
 {
        struct k_sigaction ka;
        siginfo_t info;
@@ -634,7 +600,7 @@ static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
         * if so.
         */
        if (!user_mode(regs))
-               return 0;
+               return;
 
        if (try_to_freeze())
                goto no_signal;
@@ -643,9 +609,24 @@ static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
 
        signr = get_signal_to_deliver(&info, &ka, regs, NULL);
        if (signr > 0) {
-               handle_signal(signr, &ka, &info, oldset, regs, syscall);
+               sigset_t *oldset;
+
+               if (test_thread_flag(TIF_RESTORE_SIGMASK))
+                       oldset = &current->saved_sigmask;
+               else
+                       oldset = &current->blocked;
+               if (handle_signal(signr, &ka, &info, oldset, regs, syscall) == 0) {
+                       /*
+                        * A signal was successfully delivered; the saved
+                        * sigmask will have been stored in the signal frame,
+                        * and will be restored by sigreturn, so we can simply
+                        * clear the TIF_RESTORE_SIGMASK flag.
+                        */
+                       if (test_thread_flag(TIF_RESTORE_SIGMASK))
+                               clear_thread_flag(TIF_RESTORE_SIGMASK);
+               }
                single_step_set(current);
-               return 1;
+               return;
        }
 
  no_signal:
@@ -697,14 +678,21 @@ static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
                    regs->ARM_r0 == -ERESTARTNOINTR) {
                        setup_syscall_restart(regs);
                }
+
+               /* If there's no signal to deliver, we just put the saved sigmask
+                * back.
+                */
+               if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+                       clear_thread_flag(TIF_RESTORE_SIGMASK);
+                       sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
+               }
        }
        single_step_set(current);
-       return 0;
 }
 
 asmlinkage void
 do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall)
 {
        if (thread_flags & _TIF_SIGPENDING)
-               do_signal(&current->blocked, regs, syscall);
+               do_signal(regs, syscall);
 }