| /* Code dealing with register stack frames, for GDB, the GNU debugger. |
| |
| Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
| 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2007, 2008, 2009, 2010 |
| 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 gdbarch *gdbarch = get_frame_arch (this_frame); |
| struct frame_unwind_cache *cache = *this_prologue_cache; |
| struct value *value; |
| |
| /* Return the actual value. */ |
| value = allocate_value (register_type (gdbarch, regnum)); |
| VALUE_LVAL (value) = lval_register; |
| VALUE_REGNUM (value) = regnum; |
| VALUE_FRAME_ID (value) = get_frame_id (this_frame); |
| |
| /* 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, value_contents_raw (value)); |
| |
| 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 = *this_prologue_cache; |
| return get_regcache_arch (cache->regcache); |
| } |
| |
| const struct frame_unwind sentinel_frame_unwinder = |
| { |
| SENTINEL_FRAME, |
| sentinel_frame_this_id, |
| sentinel_frame_prev_register, |
| NULL, |
| NULL, |
| NULL, |
| sentinel_frame_prev_arch, |
| }; |
| |
| const struct frame_unwind *const sentinel_frame_unwind = &sentinel_frame_unwinder; |