[MIPS] Add support for TIF_RESTORE_SIGMASK.
[linux-2.6.git] / arch / mips / kernel / signal.c
index aaec4785e9a6e9d68ce25d43c7836bb263dec69b..86a14d7b8534f661f06662441c661c85cfccee9d 100644 (file)
@@ -39,8 +39,6 @@
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
-int do_signal(sigset_t *oldset, struct pt_regs *regs);
-
 /*
  * Atomically swap in the new signal mask, and wait for a signal.
  */
@@ -50,7 +48,7 @@ save_static_function(sys_sigsuspend);
 __attribute_used__ noinline static int
 _sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
 {
-       sigset_t saveset, newset;
+       sigset_t newset;
        sigset_t __user *uset;
 
        uset = (sigset_t __user *) regs.regs[4];
@@ -59,19 +57,15 @@ _sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
        sigdelsetmask(&newset, ~_BLOCKABLE);
 
        spin_lock_irq(&current->sighand->siglock);
-       saveset = current->blocked;
+       current->saved_sigmask = current->blocked;
        current->blocked = newset;
        recalc_sigpending();
        spin_unlock_irq(&current->sighand->siglock);
 
-       regs.regs[2] = EINTR;
-       regs.regs[7] = 1;
-       while (1) {
-               current->state = TASK_INTERRUPTIBLE;
-               schedule();
-               if (do_signal(&saveset, &regs))
-                       return -EINTR;
-       }
+       current->state = TASK_INTERRUPTIBLE;
+       schedule();
+       set_thread_flag(TIF_RESTORE_SIGMASK);
+       return -ERESTARTNOHAND;
 }
 #endif
 
@@ -79,7 +73,7 @@ save_static_function(sys_rt_sigsuspend);
 __attribute_used__ noinline static int
 _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
 {
-       sigset_t saveset, newset;
+       sigset_t newset;
        sigset_t __user *unewset;
        size_t sigsetsize;
 
@@ -94,19 +88,15 @@ _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
        sigdelsetmask(&newset, ~_BLOCKABLE);
 
        spin_lock_irq(&current->sighand->siglock);
-       saveset = current->blocked;
+       current->saved_sigmask = current->blocked;
        current->blocked = newset;
         recalc_sigpending();
        spin_unlock_irq(&current->sighand->siglock);
 
-       regs.regs[2] = EINTR;
-       regs.regs[7] = 1;
-       while (1) {
-               current->state = TASK_INTERRUPTIBLE;
-               schedule();
-               if (do_signal(&saveset, &regs))
-                       return -EINTR;
-       }
+       current->state = TASK_INTERRUPTIBLE;
+       schedule();
+       set_thread_flag(TIF_RESTORE_SIGMASK);
+       return -ERESTARTNOHAND;
 }
 
 #ifdef CONFIG_TRAD_SIGNALS
@@ -315,11 +305,11 @@ int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
               current->comm, current->pid,
               frame, regs->cp0_epc, frame->regs[31]);
 #endif
-        return 1;
+        return 0;
 
 give_sigsegv:
        force_sigsegv(signr, current);
-       return 0;
+       return -EFAULT;
 }
 #endif
 
@@ -375,11 +365,11 @@ int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
               current->comm, current->pid,
               frame, regs->cp0_epc, regs->regs[31]);
 #endif
-       return 1;
+       return 0;
 
 give_sigsegv:
        force_sigsegv(signr, current);
-       return 0;
+       return -EFAULT;
 }
 
 static inline int handle_signal(unsigned long sig, siginfo_t *info,
@@ -393,7 +383,7 @@ static inline int handle_signal(unsigned long sig, siginfo_t *info,
                regs->regs[2] = EINTR;
                break;
        case ERESTARTSYS:
-               if(!(ka->sa.sa_flags & SA_RESTART)) {
+               if (!(ka->sa.sa_flags & SA_RESTART)) {
                        regs->regs[2] = EINTR;
                        break;
                }
@@ -420,9 +410,10 @@ static inline int handle_signal(unsigned long sig, siginfo_t *info,
        return ret;
 }
 
-int do_signal(sigset_t *oldset, struct pt_regs *regs)
+int do_signal(struct pt_regs *regs)
 {
        struct k_sigaction ka;
+       sigset_t *oldset;
        siginfo_t info;
        int signr;
 
@@ -437,12 +428,26 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
        if (try_to_freeze())
                goto no_signal;
 
-       if (!oldset)
+       if (test_thread_flag(TIF_RESTORE_SIGMASK))
+               oldset = &current->saved_sigmask;
+       else
                oldset = &current->blocked;
 
+
        signr = get_signal_to_deliver(&info, &ka, regs, NULL);
-       if (signr > 0)
-               return handle_signal(signr, &info, &ka, oldset, regs);
+       if (signr > 0) {
+               /* Whee!  Actually deliver the signal.  */
+               if (handle_signal(signr, &info, &ka, oldset, regs) == 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);
+               }
+       }
 
 no_signal:
        /*
@@ -463,18 +468,27 @@ no_signal:
                        regs->cp0_epc -= 4;
                }
        }
+
+       /*
+        * 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);
+       }
+
        return 0;
 }
 
 /*
  * notification of userspace execution resumption
- * - triggered by current->work.notify_resume
+ * - triggered by the TIF_WORK_MASK flags
  */
-asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
+asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
        __u32 thread_info_flags)
 {
        /* deal with pending signal delivery */
-       if (thread_info_flags & _TIF_SIGPENDING) {
-               current->thread.abi->do_signal(oldset, regs);
-       }
+       if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+               current->thread.abi->do_signal(regs);
 }