104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/* Code dealing with register stack frames, for GDB, the GNU debugger.
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Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
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1996, 1997, 1998, 1999, 2000, 2001, 2002, 2007, 2008, 2009, 2010, 2011
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "regcache.h"
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#include "sentinel-frame.h"
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#include "inferior.h"
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#include "frame-unwind.h"
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struct frame_unwind_cache
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{
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struct regcache *regcache;
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};
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void *
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sentinel_frame_cache (struct regcache *regcache)
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{
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struct frame_unwind_cache *cache =
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FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache);
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cache->regcache = regcache;
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return cache;
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}
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/* Here the register value is taken direct from the register cache. */
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static struct value *
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sentinel_frame_prev_register (struct frame_info *this_frame,
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void **this_prologue_cache,
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int regnum)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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struct frame_unwind_cache *cache = *this_prologue_cache;
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struct value *value;
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struct type *regtype = register_type (gdbarch, regnum);
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/* Return the actual value. */
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value = allocate_value (regtype);
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VALUE_LVAL (value) = lval_register;
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VALUE_REGNUM (value) = regnum;
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VALUE_FRAME_ID (value) = get_frame_id (this_frame);
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/* Use the regcache_cooked_read() method so that it, on the fly,
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constructs either a raw or pseudo register from the raw
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register cache. */
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if (regcache_cooked_read (cache->regcache,
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regnum,
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value_contents_raw (value)) == REG_UNAVAILABLE)
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mark_value_bytes_unavailable (value, 0, TYPE_LENGTH (regtype));
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return value;
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}
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static void
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sentinel_frame_this_id (struct frame_info *this_frame,
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void **this_prologue_cache,
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struct frame_id *this_id)
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{
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/* The sentinel frame is used as a starting point for creating the
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previous (inner most) frame. That frame's THIS_ID method will be
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called to determine the inner most frame's ID. Not this one. */
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internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called"));
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}
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static struct gdbarch *
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sentinel_frame_prev_arch (struct frame_info *this_frame,
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void **this_prologue_cache)
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{
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struct frame_unwind_cache *cache = *this_prologue_cache;
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return get_regcache_arch (cache->regcache);
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}
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const struct frame_unwind sentinel_frame_unwind =
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{
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SENTINEL_FRAME,
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default_frame_unwind_stop_reason,
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sentinel_frame_this_id,
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sentinel_frame_prev_register,
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NULL,
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NULL,
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NULL,
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sentinel_frame_prev_arch,
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};
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