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- /* Code dealing with register stack frames, for GDB, the GNU debugger.
- Copyright (C) 1986-2022 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 3 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, see <http://www.gnu.org/licenses/>. */
- #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. */
- static struct value *
- sentinel_frame_prev_register (struct frame_info *this_frame,
- void **this_prologue_cache,
- int regnum)
- {
- struct frame_unwind_cache *cache
- = (struct frame_unwind_cache *) *this_prologue_cache;
- struct value *value;
- value = cache->regcache->cooked_read_value (regnum);
- VALUE_NEXT_FRAME_ID (value) = sentinel_frame_id;
- return value;
- }
- static void
- sentinel_frame_this_id (struct frame_info *this_frame,
- void **this_prologue_cache,
- struct frame_id *this_id)
- {
- /* The sentinel frame is used as a starting point for creating the
- previous (inner most) frame. That frame's THIS_ID method will be
- called to determine the inner most frame's ID. Not this one. */
- internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called"));
- }
- static struct gdbarch *
- sentinel_frame_prev_arch (struct frame_info *this_frame,
- void **this_prologue_cache)
- {
- struct frame_unwind_cache *cache
- = (struct frame_unwind_cache *) *this_prologue_cache;
- return cache->regcache->arch ();
- }
- const struct frame_unwind sentinel_frame_unwind =
- {
- "sentinel",
- SENTINEL_FRAME,
- default_frame_unwind_stop_reason,
- sentinel_frame_this_id,
- sentinel_frame_prev_register,
- NULL,
- NULL,
- NULL,
- sentinel_frame_prev_arch,
- };
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