[PATCH] Fix PR backtrace/1545

[Mark Kettenis]

Thanks to David for discovering this bug and testing the fix.

Committed,

Mark


Index: ChangeLog
from  Mark Kettenis  <kettenis@gnu.org>

	* i386-linux-tdep.c (i386_linux_sigcontext_addr): Fix calculation
	of UCONTEXT_ADDR.  Fixes PR backtrace/1545.

Index: i386-linux-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/i386-linux-tdep.c,v
retrieving revision 1.34
diff -u -p -r1.34 i386-linux-tdep.c
--- i386-linux-tdep.c 15 Nov 2003 14:02:57 -0000 1.34
+++ i386-linux-tdep.c 6 Feb 2004 20:24:08 -0000
@@ -274,7 +274,7 @@ i386_linux_sigcontext_addr (struct frame
 	 pointer to the user context is passed as the third argument
 	 to the signal handler.  */
       read_memory (sp + 8, buf, 4);
-      ucontext_addr = extract_unsigned_integer (buf, 4) + 20;
+      ucontext_addr = extract_unsigned_integer (buf, 4);
       return ucontext_addr + I386_LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
     }