[PATCH] Fix hppa_linux_sigtramp_frame_unwind_cache

["John David Anglin" <dave@hiauly1.hia.nrc.ca>]

The main fix in this patch is to remove the pad increment of scptr.  As
far as I know, there is no pad field in the sigcontext struct between the
general registers and the floating point registers.

I also recorded the PSW and SAR registers.  It might be a mistake to record
the PSW value, but I believe the SAR register definitely needs to be recorded.

Somewhat tested on hppa-linux but the gdb testsuite crashes 2.6.19.22.

Ok?

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)

2008-09-13  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>

	* hppa-linux-tdep.c (hppa_linux_sigtramp_frame_unwind_cache): Record
	HPPA_IPSW_REGNUM and HPPA_SAR_REGNUM values.  Remove pad increment.

Index: hppa-linux-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/hppa-linux-tdep.c,v
retrieving revision 1.31
diff -u -3 -p -r1.31 hppa-linux-tdep.c
--- hppa-linux-tdep.c	21 Aug 2008 13:19:18 -0000	1.31
+++ hppa-linux-tdep.c	13 Sep 2008 22:51:35 -0000
@@ -227,7 +229,8 @@ hppa_linux_sigtramp_frame_unwind_cache (
   /* Skip sc_flags.  */
   scptr += 4;
 
-  /* GR[0] is the psw, we don't restore that.  */
+  /* GR[0] is the psw.  */
+  info->saved_regs[HPPA_IPSW_REGNUM].addr = scptr;
   scptr += 4;
 
   /* General registers.  */
@@ -237,9 +240,6 @@ hppa_linux_sigtramp_frame_unwind_cache (
       scptr += 4;
     }
 
-  /* Pad.  */
-  scptr += 4;
-
   /* FP regs; FP0-3 are not restored.  */
   scptr += (8 * 4);
 
@@ -262,6 +262,9 @@ hppa_linux_sigtramp_frame_unwind_cache (
   info->saved_regs[HPPA_PCOQ_TAIL_REGNUM].addr = scptr;
   scptr += 4;
 
+  info->saved_regs[HPPA_SAR_REGNUM].addr = scptr;
+  scptr += 4;
+
   info->base = get_frame_register_unsigned (this_frame, HPPA_SP_REGNUM);
 
   return info;