1 files changed, 31 insertions, 11 deletions

diff --git a/arch/blackfin/kernel/signal.c b/arch/blackfin/kernel/signal.c
index 9d90c18fab23..d536f35d1f43 100644
--- a/arch/blackfin/kernel/signal.c
+++ b/arch/blackfin/kernel/signal.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2004-2009 Analog Devices Inc.
+ * Copyright 2004-2010 Analog Devices Inc.
  *
  * Licensed under the GPL-2 or later
  */
@@ -12,10 +12,12 @@
 #include <linux/binfmts.h>
 #include <linux/freezer.h>
 #include <linux/uaccess.h>
+#include <linux/tracehook.h>
 
 #include <asm/cacheflush.h>
 #include <asm/ucontext.h>
 #include <asm/fixed_code.h>
+#include <asm/syscall.h>
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
@@ -49,6 +51,9 @@ rt_restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *p
         unsigned long usp = 0;
         int err = 0;
 
+        /* Always make any pending restarted system calls return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
 #define RESTORE(x) err |= __get_user(regs->x, &sc->sc_##x)
 
         /* restore passed registers */
@@ -205,16 +210,6 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t * info,
         regs->r1 = (unsigned long)(&frame->info);
         regs->r2 = (unsigned long)(&frame->uc);
 
-        /*
-         * Clear the trace flag when entering the signal handler, but
-         * notify any tracer that was single-stepping it. The tracer
-         * may want to single-step inside the handler too.
-         */
-        if (regs->syscfg & TRACE_BITS) {
-                regs->syscfg &= ~TRACE_BITS;
-                ptrace_notify(SIGTRAP);
-        }
-
         return 0;
 
  give_sigsegv:
@@ -246,6 +241,11 @@ handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
                 regs->r0 = regs->orig_r0;
                 regs->pc -= 2;
                 break;
+
+        case -ERESTART_RESTARTBLOCK:
+                regs->p0 = __NR_restart_syscall;
+                regs->pc -= 2;
+                break;
         }
 }
 
@@ -314,6 +314,9 @@ asmlinkage void do_signal(struct pt_regs *regs)
                          * clear the TIF_RESTORE_SIGMASK flag */
                         if (test_thread_flag(TIF_RESTORE_SIGMASK))
                                 clear_thread_flag(TIF_RESTORE_SIGMASK);
+
+                        tracehook_signal_handler(signr, &info, &ka, regs,
+                                test_thread_flag(TIF_SINGLESTEP));
                 }
 
                 return;
@@ -332,3 +335,20 @@ asmlinkage void do_signal(struct pt_regs *regs)
                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
         }
 }
+
+/*
+ * notification of userspace execution resumption
+ */
+asmlinkage void do_notify_resume(struct pt_regs *regs)
+{
+        if (test_thread_flag(TIF_SIGPENDING) || test_thread_flag(TIF_RESTORE_SIGMASK))
+                do_signal(regs);
+
+        if (test_thread_flag(TIF_NOTIFY_RESUME)) {
+                clear_thread_flag(TIF_NOTIFY_RESUME);
+                tracehook_notify_resume(regs);
+                if (current->replacement_session_keyring)
+                        key_replace_session_keyring();
+        }
+}
+