Use DWARF CFI frame unwinder on powerpc

[Andreas Schwab <schwab@suse.de>]

Together with the previous patch this enables the use of the DWARF CFI
frame unwinder on powerpc.  This fixes the following testsuite failures:

-FAIL: gdb.base/break.exp: next over recursive call
-FAIL: gdb.base/break.exp: backtrace from factorial(5.1)
-FAIL: gdb.base/recurse.exp: continue to recurse (a = 4)
-FAIL: gdb.base/recurse.exp: continue to recurse (a = 3)
-FAIL: gdb.base/recurse.exp: continue to recurse (a = 2)
-FAIL: gdb.base/recurse.exp: continue to recurse (a = 1)
-FAIL: gdb.base/recurse.exp: continue to second instance watchpoint, second time
-FAIL: gdb.base/recurse.exp: second instance watchpoint deleted when leaving scope
-FAIL: gdb.base/recurse.exp: continue to first instance watchpoint, second time
-FAIL: gdb.base/recurse.exp: first instance watchpoint deleted when leaving scope
-FAIL: gdb.base/sepdebug.exp: next over recursive call
-FAIL: gdb.base/sepdebug.exp: backtrace from factorial(5.1)

without any new regressions.  Tested with powerpc-suse-linux.

Andreas.

2006-05-09  Andreas Schwab  <schwab@suse.de>

	* rs6000-tdep.c: Include "dwarf2-frame.h".
	(rs6000_eh_frame_regnum): Define.
	(rs6000_gdbarch_init): Enable use of DWARF CFI frame unwinder.
	Register rs6000_eh_frame_regnum.

	* Makefile.in (rs6000-tdep.o): Update dependencies.

Index: gdb/Makefile.in
===================================================================
RCS file: /cvs/src/src/gdb/Makefile.in,v
retrieving revision 1.812
diff -u -a -p -u -p -a -r1.812 gdb/Makefile.in
--- gdb/Makefile.in	5 May 2006 22:39:12 -0000	1.812
+++ gdb/Makefile.in	9 May 2006 14:10:40 -0000
@@ -2515,7 +2515,7 @@ rs6000-tdep.o: rs6000-tdep.c $(defs_h) $
 	$(reggroups_h) $(libbfd_h) $(coff_internal_h) $(libcoff_h) \
 	$(coff_xcoff_h) $(libxcoff_h) $(elf_bfd_h) $(solib_svr4_h) \
 	$(ppc_tdep_h) $(gdb_assert_h) $(dis_asm_h) $(trad_frame_h) \
-	$(frame_unwind_h) $(frame_base_h) $(rs6000_tdep_h)
+	$(frame_unwind_h) $(frame_base_h) $(rs6000_tdep_h) $(dwarf2_frame_h)
 rs6000-aix-tdep.o: rs6000-aix-tdep.c $(defs_h) $(osabi_h) $(rs6000_tdep_h)
 s390-nat.o: s390-nat.c $(defs_h) $(tm_h) $(regcache_h) $(inferior_h) \
 	$(s390_tdep_h) $(target_h) $(linux_nat_h)
Index: gdb/rs6000-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/rs6000-tdep.c,v
retrieving revision 1.258
diff -u -a -p -u -p -a -r1.258 gdb/rs6000-tdep.c
--- gdb/rs6000-tdep.c	23 Apr 2006 14:15:01 -0000	1.258
+++ gdb/rs6000-tdep.c	9 May 2006 14:10:15 -0000
@@ -40,6 +40,7 @@
 #include "sim-regno.h"
 #include "gdb/sim-ppc.h"
 #include "reggroups.h"
+#include "dwarf2-frame.h"
 
 #include "libbfd.h"		/* for bfd_default_set_arch_mach */
 #include "coff/internal.h"	/* for libcoff.h */
@@ -2243,6 +2244,40 @@ rs6000_dwarf2_reg_to_regnum (int num)
 }
 
 
+/* Convert a .eh_frame register number to a Dwarf 2 register number.  */
+static int
+rs6000_eh_frame_regnum (struct gdbarch *gdbarch, int num)
+{
+  if (0 <= num && num <= 63)	/* r0-r31,fp0-fp31 */
+    return num;
+  else if (68 <= num && num <= 75) /* cr0-cr8 */
+    return num - 68 + 86;
+  else if (77 <= num && num <= 108) /* vr0-vr31 */
+    return num - 77 + 1124;
+  else
+    switch (num)
+      {
+      case 64: /* mq */
+	return 100;
+      case 65: /* lr */
+	return 108;
+      case 66: /* ctr */
+	return 109;
+      case 76: /* xer */
+	return 101;
+      case 109: /* vrsave */
+	return 356;
+      case 110: /* vscr */
+	return 67;
+      case 111: /* spe_acc */
+	return 99;
+      case 112: /* spefscr */
+	return 612;
+      default:
+	return num;
+      }
+}
+
 static void
 rs6000_store_return_value (struct type *type,
                            struct regcache *regcache,
@@ -3461,6 +3496,10 @@ rs6000_gdbarch_init (struct gdbarch_info
   /* Helpers for function argument information.  */
   set_gdbarch_fetch_pointer_argument (gdbarch, rs6000_fetch_pointer_argument);
 
+  /* Hook in the DWARF CFI frame unwinder.  */
+  frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
+  dwarf2_frame_set_eh_frame_regnum (gdbarch, rs6000_eh_frame_regnum);
+
   /* Hook in ABI-specific overrides, if they have been registered.  */
   gdbarch_init_osabi (info, gdbarch);
 

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."