[PATCH] Make Solaris/SPARC native work again

[Kevin Buettner <kevinb@redhat.com>]

I've just committed the patches below.  These were necessary to make
Solaris/SPARC native work again.  (There were actually two patches that
broke Solaris/SPARC.  The first was committed on 2002-12-09 and the
second on 2003-01-06.)

	* sparc-tdep.c (sparc_frame_chain): Adjust return value.
	* config/sparc/tm-sparc.h (init_frame_pc_noop): Declare.

Index: sparc-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/sparc-tdep.c,v
retrieving revision 1.64
diff -u -p -r1.64 sparc-tdep.c
--- sparc-tdep.c	15 Jan 2003 19:35:27 -0000	1.64
+++ sparc-tdep.c	18 Feb 2003 22:43:46 -0000
@@ -431,8 +431,20 @@ sparc_frame_chain (struct frame_info *fr
 {
   /* Value that will cause FRAME_CHAIN_VALID to not worry about the chain
      value.  If it really is zero, we detect it later in
-     sparc_init_prev_frame.  */
-  return (CORE_ADDR) 1;
+     sparc_init_prev_frame.
+     
+     Note:  kevinb/2003-02-18:  The constant 1 used to be returned
+     here, but, after some recent changes to frame_chain_valid(),
+     this value is no longer suitable for causing frame_chain_valid()
+     to "not worry about the chain value."  The constant ~0 (i.e,
+     0xfff...) causes the failing test in frame_chain_valid() to
+     succeed thus preserving the "not worry" property.  I had considered
+     using something like ``get_frame_base (frame) + 1''.  However, I think
+     a constant value is better, because when debugging this problem,
+     I knew that something funny was going on as soon as I saw the
+     constant 1 being used as the frame chain elsewhere in GDB.  */
+
+  return ~ (CORE_ADDR) 0;
 }
 
 CORE_ADDR
Index: config/sparc/tm-sparc.h
===================================================================
RCS file: /cvs/src/src/gdb/config/sparc/tm-sparc.h,v
retrieving revision 1.30
diff -u -p -r1.30 tm-sparc.h
--- config/sparc/tm-sparc.h	19 Jan 2003 04:06:47 -0000	1.30
+++ config/sparc/tm-sparc.h	18 Feb 2003 22:43:46 -0000
@@ -511,6 +511,10 @@ extern void sparc_print_extra_frame_info
 
 /* INIT_EXTRA_FRAME_INFO needs the PC to detect flat frames.  */
 
+/* NOTE: cagney/2002-12-08: Add local declaration of
+   init_frame_pc_noop() because it isn't possible to include
+   "arch-utils.h" here.  */
+extern CORE_ADDR init_frame_pc_noop (int fromleaf, struct frame_info *prev);
 #define	DEPRECATED_INIT_FRAME_PC(FROMLEAF, PREV)	(init_frame_pc_noop (FROMLEAF, PREV))
 #define DEPRECATED_INIT_FRAME_PC_FIRST(FROMLEAF, PREV) \
   ((FROMLEAF) ? SAVED_PC_AFTER_CALL ((PREV)->next) : \