[PATCH 2.5.73] Signal handling fix for ppc

["Jörn Engel" <joern@wohnheim.fh-wedel.de>]

Hi!

This patch causes an application with a broken stack to die with a
SIGSEGV (and a core dump and all that) instead of a silent do_exit.

Most other architectures already have it, so ppc should get it as
well.

Anton, did I understand it correctly that you already have the
equivalent for ppc64 in the queue?

Jörn

-- 
With a PC, I always felt limited by the software available. On Unix, 
I am limited only by my knowledge.
-- Peter J. Schoenster

--- linux-2.5.73/arch/ppc/kernel/signal.c~sigsegv_ppc	2003-07-03 19:17:21.000000000 +0200
+++ linux-2.5.73/arch/ppc/kernel/signal.c	2003-07-04 19:01:55.000000000 +0200
@@ -234,7 +234,9 @@
 	return 0;
 
 badframe:
-	do_exit(SIGSEGV);
+	if (sig == SIGSEGV)
+		ka->sa.sa_handler = SIG_DFL;
+	force_sig(SIGSEGV, current);
 }
 
 static void
@@ -285,7 +287,9 @@
 	printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
 	       regs, frame, newsp);
 #endif
-	do_exit(SIGSEGV);
+	if (sig == SIGSEGV)
+		ka->sa.sa_handler = SIG_DFL;
+	force_sig(SIGSEGV, current);
 }
 
 /*
@@ -332,7 +336,9 @@
 	return 0;
 
 badframe:
-	do_exit(SIGSEGV);
+	if (sig == SIGSEGV)
+		ka->sa.sa_handler = SIG_DFL;
+	force_sig(SIGSEGV, current);
 }	
 
 /*
@@ -375,7 +381,9 @@
 	printk("badframe in setup_frame, regs=%p frame=%p newsp=%lx\n",
 	       regs, frame, newsp);
 #endif
-	do_exit(SIGSEGV);
+	if (sig == SIGSEGV)
+		ka->sa.sa_handler = SIG_DFL;
+	force_sig(SIGSEGV, current);
 }
 
 /*
@@ -462,7 +470,9 @@
 	       regs, frame, *newspp);
 	printk("sc=%p sig=%d ka=%p info=%p oldset=%p\n", sc, sig, ka, info, oldset);
 #endif
-	do_exit(SIGSEGV);
+	if (sig == SIGSEGV)
+		ka->sa.sa_handler = SIG_DFL;
+	force_sig(SIGSEGV, current);
 }
 
 /*