new helper: signal_delivered()

Does block_sigmask() + tracehook_signal_handler();  called when
sigframe has been successfully built.  All architectures converted
to it; block_sigmask() itself is gone now (merged into this one).

I'm still not too happy with the signature, but that's a separate
story (IMO we need a structure that would contain signal number +
siginfo + k_sigaction, so that get_signal_to_deliver() would fill one,
signal_delivered(), handle_signal() and probably setup...frame() -
take one).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/alpha/kernel/signal.c

@@ -478,7 +478,7 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
 		force_sigsegv(sig, current);
 		return;
 	}
-	block_sigmask(ka, sig);
+	signal_delivered(sig, info, ka, regs, 0);
 }
 
 static inline void

arch/arm/kernel/signal.c

@@ -557,12 +557,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
 		force_sigsegv(sig, tsk);
 		return;
 	}
-
-	/*
-	 * Block the signal if we were successful.
-	 */
-	block_sigmask(ka, sig);
-	tracehook_signal_handler(sig, info, ka, regs, 0);
+	signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*

arch/avr32/kernel/signal.c

@@ -241,7 +241,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
 	if (ret != 0)
 		force_sigsegv(sig, current);
 	else
-		block_sigmask(ka, sig);
+		signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*

arch/blackfin/kernel/signal.c

@@ -260,8 +260,7 @@ handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
 	if (ret)
 		return;
 
-	block_sigmask(ka, sig);
-	tracehook_signal_handler(sig, info, ka, regs,
+	signal_delivered(sig, info, ka, regs,
 			test_thread_flag(TIF_SINGLESTEP));
 }
 

arch/c6x/kernel/signal.c

@@ -276,8 +276,7 @@ static void handle_signal(int sig,
 	/* Set up the stack frame */
 	if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs) < 0)
 		return;
-	block_sigmask(ka, sig);
-	tracehook_signal_handler(sig, info, ka, regs, 0);
+	signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*

arch/cris/arch-v10/kernel/signal.c

@@ -453,7 +453,7 @@ static inline void handle_signal(int canrestart, unsigned long sig,
 		ret = setup_frame(sig, ka, oldset, regs);
 
 	if (ret == 0)
-		block_sigmask(ka, sig);
+		signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*

arch/cris/arch-v32/kernel/signal.c

@@ -485,7 +485,7 @@ handle_signal(int canrestart, unsigned long sig,
 		ret = setup_frame(sig, ka, oldset, regs);
 
 	if (ret == 0)
-		block_sigmask(ka, sig);
+		signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*

arch/frv/kernel/signal.c

@@ -460,8 +460,7 @@ static void handle_signal(unsigned long sig, siginfo_t *info,
 	if (ret)
 		return;
 
-	block_sigmask(ka, sig);
-	tracehook_signal_handler(sig, info, ka, __frame,
+	signal_delivered(sig, info, ka, __frame,
 				 test_thread_flag(TIF_SINGLESTEP));
 } /* end handle_signal() */
 

arch/h8300/kernel/signal.c

@@ -439,7 +439,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 		ret = setup_frame(sig, ka, oldset, regs);
 
 	if (!ret)
-		block_sigmask(ka, sig);
+		signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*

arch/hexagon/kernel/signal.c

@@ -186,8 +186,7 @@ static void handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
 	if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs) < 0)
 		return;
 
-	block_sigmask(ka, sig);
-	tracehook_signal_handler(sig, info, ka, regs,
+	signal_delivered(sig, info, ka, regs,
 			test_thread_flag(TIF_SINGLESTEP));
 }
 

arch/ia64/kernel/signal.c

@@ -419,12 +419,7 @@ handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
 	if (!setup_frame(sig, ka, info, sigmask_to_save(), scr))
 		return 0;
 
-	block_sigmask(ka, sig);
-
-	/*
-	 * Let tracing know that we've done the handler setup.
-	 */
-	tracehook_signal_handler(sig, info, ka, &scr->pt,
+	signal_delivered(sig, info, ka, &scr->pt,
 				 test_thread_flag(TIF_SINGLESTEP));
 
 	return 1;

arch/m32r/kernel/signal.c

@@ -294,7 +294,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
 	if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs))
 		return;
 
-	block_sigmask(ka, sig);
+	signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*

arch/m68k/kernel/signal.c

@@ -1137,7 +1137,7 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
 	if (err)
 		return;
 
-	block_sigmask(ka, sig);
+	signal_delivered(sig, info, ka, regs, 0);
 
 	if (test_thread_flag(TIF_DELAYED_TRACE)) {
 		regs->sr &= ~0x8000;

arch/microblaze/kernel/signal.c

@@ -323,7 +323,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
 	if (ret)
 		return;
 
-	block_sigmask(ka, sig);
+	signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*

arch/mips/kernel/signal.c

@@ -551,7 +551,7 @@ static void handle_signal(unsigned long sig, siginfo_t *info,
 	if (ret)
 		return;
 
-	block_sigmask(ka, sig);
+	signal_delivered(sig, info, ka, regs, 0);
 }
 
 static void do_signal(struct pt_regs *regs)

arch/mn10300/kernel/signal.c

@@ -461,8 +461,7 @@ static int handle_signal(int sig,
 	if (ret)
 		return;
 
-	block_sigmask(ka, sig);
-	tracehook_signal_handler(sig, info, ka, regs,
+	signal_delivered(sig, info, ka, regs,
 				 test_thread_flag(TIF_SINGLESTEP));
 }
 

arch/openrisc/kernel/signal.c

@@ -259,8 +259,7 @@ handle_signal(unsigned long sig,
 	if (ret)
 		return;
 
-	block_sigmask(ka, sig);
-	tracehook_signal_handler(sig, info, ka, regs,
+	signal_delivered(sig, info, ka, regs,
 				 test_thread_flag(TIF_SINGLESTEP));
 }
 

arch/parisc/kernel/signal.c

@@ -449,9 +449,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 	if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall))
 		return 0;
 
-	block_sigmask(ka, sig);
-
-	tracehook_signal_handler(sig, info, ka, regs, 
+	signal_delivered(sig, info, ka, regs, 
 		test_thread_flag(TIF_SINGLESTEP) ||
 		test_thread_flag(TIF_BLOCKSTEP));
 

arch/powerpc/kernel/signal.c

@@ -148,11 +148,7 @@ static int do_signal(struct pt_regs *regs)
 
 	regs->trap = 0;
 	if (ret) {
-		block_sigmask(&ka, signr);
-		/*
-		 * Let tracing know that we've done the handler setup.
-		 */
-		tracehook_signal_handler(signr, &info, &ka, regs,
+		signal_delivered(signr, &info, &ka, regs,
 					 test_thread_flag(TIF_SINGLESTEP));
 	}
 

arch/s390/kernel/compat_signal.c

@@ -580,11 +580,7 @@ void handle_signal32(unsigned long sig, struct k_sigaction *ka,
 		ret = setup_frame32(sig, ka, oldset, regs);
 	if (ret)
 		return;
-	block_sigmask(ka, sig);
-	/*
-	 * Let tracing know that we've done the handler setup.
-	 */
-	tracehook_signal_handler(sig, info, ka, regs,
+	signal_delivered(sig, info, ka, regs,
 				 test_thread_flag(TIF_SINGLE_STEP));
 }
 

arch/s390/kernel/signal.c

@@ -375,11 +375,7 @@ static void handle_signal(unsigned long sig, struct k_sigaction *ka,
 		ret = setup_frame(sig, ka, oldset, regs);
 	if (ret)
 		return;
-	block_sigmask(ka, sig);
-	/*
-	 * Let tracing know that we've done the handler setup.
-	 */
-	tracehook_signal_handler(sig, info, ka, regs,
+	signal_delivered(sig, info, ka, regs,
 				 test_thread_flag(TIF_SINGLE_STEP));
 }
 

arch/score/kernel/signal.c

@@ -267,7 +267,7 @@ static void handle_signal(unsigned long sig, siginfo_t *info,
 	if (setup_rt_frame(ka, regs, sig, sigmask_to_save(), info) < 0)
 		return;
 
-	block_sigmask(ka, sig);
+	signal_delivered(sig, info, ka, regs, 0);
 }
 
 static void do_signal(struct pt_regs *regs)

arch/sh/kernel/signal_32.c

@@ -533,8 +533,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
 
 	if (ret)
 		return;
-	block_sigmask(ka, sig);
-	tracehook_signal_handler(sig, info, ka, regs,
+	signal_delivered(sig, info, ka, regs,
 			test_thread_flag(TIF_SINGLESTEP));
 }
 

arch/sh/kernel/signal_64.c

@@ -650,8 +650,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 	if (ret)
 		return;
 
-	block_sigmask(ka, sig);
-	tracehook_signal_handler(sig, info, ka, regs,
+	signal_delivered(sig, info, ka, regs,
 			test_thread_flag(TIF_SINGLESTEP));
 }
 

arch/sparc/kernel/signal32.c

@@ -785,8 +785,7 @@ static inline void handle_signal32(unsigned long signr, struct k_sigaction *ka,
 	if (err)
 		return;
 
-	block_sigmask(ka, signr);
-	tracehook_signal_handler(signr, info, ka, regs, 0);
+	signal_delivered(signr, info, ka, regs, 0);
 }
 
 static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,

arch/sparc/kernel/signal_32.c

@@ -460,8 +460,7 @@ handle_signal(unsigned long signr, struct k_sigaction *ka,
 	if (err)
 		return;
 
-	block_sigmask(ka, signr);
-	tracehook_signal_handler(signr, info, ka, regs, 0);
+	signal_delivered(signr, info, ka, regs, 0);
 }
 
 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,

arch/sparc/kernel/signal_64.c

@@ -473,8 +473,7 @@ static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
 	if (err)
 		return;
 
-	block_sigmask(ka, signr);
-	tracehook_signal_handler(signr, info, ka, regs, 0);
+	signal_delivered(signr, info, ka, regs, 0);
 }
 
 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,

arch/tile/kernel/signal.c

@@ -278,7 +278,7 @@ static void handle_signal(unsigned long sig, siginfo_t *info,
 		ret = setup_rt_frame(sig, ka, info, oldset, regs);
 	if (ret)
 		return;
-	block_sigmask(ka, sig);
+	signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*

arch/um/kernel/signal.c

@@ -61,7 +61,7 @@ static void handle_signal(struct pt_regs *regs, unsigned long signr,
 	if (err)
 		force_sigsegv(signr, current);
 	else
-		block_sigmask(ka, signr);
+		signal_delivered(signr, info, ka, regs, 0);
 }
 
 static int kern_do_signal(struct pt_regs *regs)

arch/unicore32/kernel/signal.c

@@ -362,10 +362,7 @@ static void handle_signal(unsigned long sig, struct k_sigaction *ka,
 		return;
 	}
 
-	/*
-	 * Block the signal if we were successful.
-	 */
-	block_sigmask(ka, sig);
+	signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*

arch/x86/kernel/signal.c

@@ -715,9 +715,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 	 */
 	regs->flags &= ~X86_EFLAGS_TF;
 
-	block_sigmask(ka, sig);
-
-	tracehook_signal_handler(sig, info, ka, regs,
+	signal_delivered(sig, info, ka, regs,
 			 test_thread_flag(TIF_SINGLESTEP));
 }
 

arch/xtensa/kernel/signal.c

@@ -493,7 +493,7 @@ static void do_signal(struct pt_regs *regs)
 		if (ret)
 			return;
 
-		block_sigmask(&ka, signr);
+		signal_delivered(signr, info, ka, regs, 0);
 		if (current->ptrace & PT_SINGLESTEP)
 			task_pt_regs(current)->icountlevel = 1;
 

include/linux/signal.h

@@ -256,7 +256,7 @@ extern int show_unhandled_signals;
 extern int sigsuspend(sigset_t *);
 
 extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
-extern void block_sigmask(struct k_sigaction *ka, int signr);
+extern void signal_delivered(int sig, siginfo_t *info, struct k_sigaction *ka, struct pt_regs *regs, int stepping);
 extern void exit_signals(struct task_struct *tsk);
 
 extern struct kmem_cache *sighand_cachep;

kernel/signal.c

@@ -2368,17 +2368,20 @@ int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka,
 }
 
 /**
- * block_sigmask - add @ka's signal mask to current->blocked
- * @ka: action for @signr
- * @signr: signal that has been successfully delivered
+ * signal_delivered - 
+ * @sig:		number of signal being delivered
+ * @info:		siginfo_t of signal being delivered
+ * @ka:			sigaction setting that chose the handler
+ * @regs:		user register state
+ * @stepping:		nonzero if debugger single-step or block-step in use
  *
  * This function should be called when a signal has succesfully been
- * delivered. It adds the mask of signals for @ka to current->blocked
- * so that they are blocked during the execution of the signal
- * handler. In addition, @signr will be blocked unless %SA_NODEFER is
- * set in @ka->sa.sa_flags.
+ * delivered. It updates the blocked signals accordingly (@ka->sa.sa_mask
+ * is always blocked, and the signal itself is blocked unless %SA_NODEFER
+ * is set in @ka->sa.sa_flags.  Tracing is notified.
  */
-void block_sigmask(struct k_sigaction *ka, int signr)
+void signal_delivered(int sig, siginfo_t *info, struct k_sigaction *ka,
+			struct pt_regs *regs, int stepping)
 {
 	sigset_t blocked;
 
@@ -2390,8 +2393,9 @@ void block_sigmask(struct k_sigaction *ka, int signr)
 
 	sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
 	if (!(ka->sa.sa_flags & SA_NODEFER))
-		sigaddset(&blocked, signr);
+		sigaddset(&blocked, sig);
 	set_current_blocked(&blocked);
+	tracehook_signal_handler(sig, info, ka, regs, stepping);
 }
 
 /*