[MIPS] IRIX: Crapectopy.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 40 insertions, 15 deletions

diff --git a/arch/mips/kernel/irixsig.c b/arch/mips/kernel/irixsig.c
index e6f40609ba6a..052ea15f1e80 100644
--- a/arch/mips/kernel/irixsig.c
+++ b/arch/mips/kernel/irixsig.c
@@ -17,6 +17,7 @@
 
 #include <asm/ptrace.h>
 #include <asm/uaccess.h>
+#include <asm/unistd.h>
 
 #undef DEBUG_SIG
 
@@ -172,11 +173,12 @@ static inline int handle_signal(unsigned long sig, siginfo_t *info,
         return ret;
 }
 
-asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
+void do_irix_signal(struct pt_regs *regs)
 {
         struct k_sigaction ka;
         siginfo_t info;
         int signr;
+        sigset_t *oldset;
 
         /*
          * We want the common case to go fast, which is why we may in certain
@@ -184,14 +186,27 @@ asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
          * if so.
          */
         if (!user_mode(regs))
-                return 1;
+                return;
 
-        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);
+                }
+
+                return;
+        }
 
         /*
          * Who's code doesn't conform to the restartable syscall convention
@@ -204,8 +219,21 @@ asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
                     regs->regs[2] == ERESTARTNOINTR) {
                         regs->cp0_epc -= 8;
                 }
+                if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
+                        regs->regs[2] = __NR_restart_syscall;
+                        regs->regs[7] = regs->regs[26];
+                        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;
 }
 
 asmlinkage void
@@ -409,7 +437,7 @@ asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 
 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 {
-        sigset_t saveset, newset;
+        sigset_t newset;
         sigset_t __user *uset;
 
         uset = (sigset_t __user *) regs->regs[4];
@@ -418,18 +446,15 @@ asmlinkage int irix_sigsuspend(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;
-        while (1) {
-                current->state = TASK_INTERRUPTIBLE;
-                schedule();
-                if (do_irix_signal(&saveset, regs))
-                        return -EINTR;
-        }
+        current->state = TASK_INTERRUPTIBLE;
+        schedule();
+        set_thread_flag(TIF_RESTORE_SIGMASK);
+        return -ERESTARTNOHAND;
 }
 
 /* hate hate hate... */