Sparc{,64}: On PTRACEd processes, do the syscall restart before

we notify the parent.

arch/sparc/kernel/signal.c

@@ -1173,9 +1173,23 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
 		signr = dequeue_signal(&current->blocked, &info);
 		spin_unlock_irq(&current->sigmask_lock);
 
-		if (!signr) break;
+		if (!signr)
+			break;
 
 		if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
+			/* Do the syscall restart before we let the debugger
+			 * look at the child registers.
+			 */
+			if (restart_syscall &&
+			    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
+			     regs->u_regs[UREG_I0] == ERESTARTSYS ||
+			     regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
+				/* replay the system call when we are done */
+				regs->u_regs[UREG_I0] = orig_i0;
+				regs->pc -= 4;
+				regs->npc -= 4;
+				restart_syscall = 0;
+			}
 			current->exit_code = signr;
 			current->state = TASK_STOPPED;
 
@@ -1208,8 +1222,8 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
 
 		ka = &current->sig->action[signr-1];
 
-		if(ka->sa.sa_handler == SIG_IGN) {
-			if(signr != SIGCHLD)
+		if (ka->sa.sa_handler == SIG_IGN) {
+			if (signr != SIGCHLD)
 				continue;
 
 			/* sys_wait4() grabs the master kernel lock, so
@@ -1221,12 +1235,12 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
 				;
 			continue;
 		}
-		if(ka->sa.sa_handler == SIG_DFL) {
+		if (ka->sa.sa_handler == SIG_DFL) {
 			unsigned long exit_code = signr;
 
-			if(current->pid == 1)
+			if (current->pid == 1)
 				continue;
-			switch(signr) {
+			switch (signr) {
 			case SIGCONT: case SIGCHLD: case SIGWINCH:
 				continue;
 
@@ -1265,7 +1279,7 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
 					struct reg_window *rw = (struct reg_window *)regs->u_regs[UREG_FP];
 					unsigned int ins[8];
 
-					while(rw &&
+					while (rw &&
 					       !(((unsigned long) rw) & 0x3)) {
 						copy_from_user(ins, &rw->ins[0], sizeof(ins));
 						printk("Caller[%08x](%08x,%08x,%08x,%08x,%08x,%08x)\n", ins[7], ins[0], ins[1], ins[2], ins[3], ins[4], ins[5]);
@@ -1287,12 +1301,12 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
 				/* NOT REACHED */
 			}
 		}
-		if(restart_syscall)
+		if (restart_syscall)
 			syscall_restart(orig_i0, regs, &ka->sa);
 		handle_signal(signr, ka, &info, oldset, regs, svr4_signal);
 		return 1;
 	}
-	if(restart_syscall &&
+	if (restart_syscall &&
 	    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 	     regs->u_regs[UREG_I0] == ERESTARTSYS ||
 	     regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {

arch/sparc64/kernel/signal.c

@@ -709,9 +709,24 @@ static int do_signal(sigset_t *oldset, struct pt_regs * regs,
 		signr = dequeue_signal(&current->blocked, &info);
 		spin_unlock_irq(&current->sigmask_lock);
 		
-		if (!signr) break;
+		if (!signr)
+			break;
 
 		if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
+			/* Do the syscall restart before we let the debugger
+			 * look at the child registers.
+			 */
+			if (restart_syscall &&
+			    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
+			     regs->u_regs[UREG_I0] == ERESTARTSYS ||
+			     regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
+				/* replay the system call when we are done */
+				regs->u_regs[UREG_I0] = orig_i0;
+				regs->tpc -= 4;
+				regs->tnpc -= 4;
+				restart_syscall = 0;
+			}
+
 			current->exit_code = signr;
 			current->state = TASK_STOPPED;
 			notify_parent(current, SIGCHLD);

arch/sparc64/kernel/signal32.c

@@ -1383,9 +1383,24 @@ int do_signal32(sigset_t *oldset, struct pt_regs * regs,
 		signr = dequeue_signal(&current->blocked, &info);
 		spin_unlock_irq(&current->sigmask_lock);
 		
-		if (!signr) break;
+		if (!signr)
+			break;
 
 		if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
+			/* Do the syscall restart before we let the debugger
+			 * look at the child registers.
+			 */
+			if (restart_syscall &&
+			    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
+			     regs->u_regs[UREG_I0] == ERESTARTSYS ||
+			     regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
+				/* replay the system call when we are done */
+				regs->u_regs[UREG_I0] = orig_i0;
+				regs->tpc -= 4;
+				regs->tnpc -= 4;
+				restart_syscall = 0;
+			}
+
 			current->exit_code = signr;
 			current->state = TASK_STOPPED;
 			notify_parent(current, SIGCHLD);