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authorAndrew Cagney <cagney@redhat.com>2003-01-27 21:41:41 +0000
committerAndrew Cagney <cagney@redhat.com>2003-01-27 21:41:41 +0000
commitbe4507bdc9e5c7e6e4471ff361534232aea3e442 (patch)
tree6adbe97543cf8afae6cc24a1ed637ebb39f02382 /gdb/sentinel-frame.c
parent38fec97148307ce55c3c20dcee14820550816e1c (diff)
downloadgdb-be4507bdc9e5c7e6e4471ff361534232aea3e442.tar.gz
2003-01-27 Andrew Cagney <ac131313@redhat.com>
* sentinel-frame.h, sentinel-frame.c: New files. * Makefile.in (frame.o): Update dependencies. (SFILES): Add sentinel-frame.c. (sentinel_frame_h): Define. (COMMON_OBS): Add sentinel-frame.o. (sentinel-frame.o): Specify dependencies. * frame.c: Include "sentinel-frame.h". (frame_register_unwind): Rewrite assuming that there is always a a ->next frame. (frame_register, generic_unwind_get_saved_register): Ditto. (frame_read_unsigned_register, frame_read_signed_register): Ditto. (create_sentinel_frame, unwind_to_current_frame): New functions. (get_current_frame): Rewrite using create_sentinel_frame and unwind_to_current_frame. When possible, always create a frame. (create_new_frame): Set next to the sentinel frame. (get_next_frame): Rewrite. Don't go below the level 0 frame. (deprecated_update_frame_pc_hack): Update the next frame's PC and ID cache when necessary. (frame_saved_regs_id_unwind): Use frame_relative_level. (deprecated_generic_get_saved_register): Use frame_relative_level, get_frame_saved_regs, get_frame_pc, get_frame_base and get_next_frame. (frame_saved_regs_register_unwind): Use get_frame_saved_regs and frame_register.
Diffstat (limited to 'gdb/sentinel-frame.c')
-rw-r--r--gdb/sentinel-frame.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/gdb/sentinel-frame.c b/gdb/sentinel-frame.c
new file mode 100644
index 00000000000..fe11d8a6f43
--- /dev/null
+++ b/gdb/sentinel-frame.c
@@ -0,0 +1,113 @@
+/* Code dealing with register stack frames, for GDB, the GNU debugger.
+
+ Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
+ 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software
+ Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+
+#include "defs.h"
+#include "regcache.h"
+#include "sentinel-frame.h"
+#include "inferior.h"
+#include "frame-unwind.h"
+
+struct frame_unwind_cache
+{
+ struct regcache *regcache;
+};
+
+void *
+sentinel_frame_cache (struct regcache *regcache)
+{
+ struct frame_unwind_cache *cache =
+ FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache);
+ cache->regcache = regcache;
+ return cache;
+}
+
+/* Here the register value is taken direct from the register cache. */
+
+void
+sentinel_frame_register_unwind (struct frame_info *frame,
+ void **unwind_cache,
+ int regnum, int *optimized,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnum, void *bufferp)
+{
+ struct frame_unwind_cache *cache = *unwind_cache;
+ /* Describe the register's location. A reg-frame maps all registers
+ onto the corresponding hardware register. */
+ *optimized = 0;
+ *lvalp = lval_register;
+ *addrp = REGISTER_BYTE (regnum);
+ *realnum = regnum;
+
+ /* If needed, find and return the value of the register. */
+ if (bufferp != NULL)
+ {
+ /* Return the actual value. */
+ /* Use the regcache_cooked_read() method so that it, on the fly,
+ constructs either a raw or pseudo register from the raw
+ register cache. */
+ regcache_cooked_read (cache->regcache, regnum, bufferp);
+ }
+}
+
+CORE_ADDR
+sentinel_frame_pc_unwind (struct frame_info *frame,
+ void **cache)
+{
+ /* FIXME: cagney/2003-01-08: This should be using a per-architecture
+ method that doesn't suffer from DECR_PC_AFTER_BREAK problems.
+ Such a method would take unwind_cache, regcache and stop reason
+ parameters. */
+ return read_pc ();
+}
+
+void
+sentinel_frame_id_unwind (struct frame_info *frame,
+ void **cache,
+ struct frame_id *id)
+{
+ /* FIXME: cagney/2003-01-08: This should be using a per-architecture
+ method that doesn't suffer from DECR_PC_AFTER_BREAK problems.
+ Such a method would take unwind_cache, regcache and stop reason
+ parameters. */
+ id->base = read_fp ();
+ id->pc = read_pc ();
+}
+
+static void
+sentinel_frame_pop (struct frame_info *frame,
+ void **cache,
+ struct regcache *regcache)
+{
+ internal_error (__FILE__, __LINE__, "Function sentinal_frame_pop called");
+}
+
+const struct frame_unwind sentinel_frame_unwinder =
+{
+ sentinel_frame_pop,
+ sentinel_frame_pc_unwind,
+ sentinel_frame_id_unwind,
+ sentinel_frame_register_unwind
+};
+
+const struct frame_unwind *const sentinel_frame_unwind = &sentinel_frame_unwinder;