| 1 | /* Code dealing with register stack frames, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986-2015 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "regcache.h" |
| 23 | #include "sentinel-frame.h" |
| 24 | #include "inferior.h" |
| 25 | #include "frame-unwind.h" |
| 26 | |
| 27 | struct frame_unwind_cache |
| 28 | { |
| 29 | struct regcache *regcache; |
| 30 | }; |
| 31 | |
| 32 | void * |
| 33 | sentinel_frame_cache (struct regcache *regcache) |
| 34 | { |
| 35 | struct frame_unwind_cache *cache = |
| 36 | FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache); |
| 37 | |
| 38 | cache->regcache = regcache; |
| 39 | return cache; |
| 40 | } |
| 41 | |
| 42 | /* Here the register value is taken direct from the register cache. */ |
| 43 | |
| 44 | static struct value * |
| 45 | sentinel_frame_prev_register (struct frame_info *this_frame, |
| 46 | void **this_prologue_cache, |
| 47 | int regnum) |
| 48 | { |
| 49 | struct frame_unwind_cache *cache = *this_prologue_cache; |
| 50 | struct value *value; |
| 51 | |
| 52 | value = regcache_cooked_read_value (cache->regcache, regnum); |
| 53 | VALUE_FRAME_ID (value) = get_frame_id (this_frame); |
| 54 | |
| 55 | return value; |
| 56 | } |
| 57 | |
| 58 | static void |
| 59 | sentinel_frame_this_id (struct frame_info *this_frame, |
| 60 | void **this_prologue_cache, |
| 61 | struct frame_id *this_id) |
| 62 | { |
| 63 | /* The sentinel frame is used as a starting point for creating the |
| 64 | previous (inner most) frame. That frame's THIS_ID method will be |
| 65 | called to determine the inner most frame's ID. Not this one. */ |
| 66 | internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called")); |
| 67 | } |
| 68 | |
| 69 | static struct gdbarch * |
| 70 | sentinel_frame_prev_arch (struct frame_info *this_frame, |
| 71 | void **this_prologue_cache) |
| 72 | { |
| 73 | struct frame_unwind_cache *cache = *this_prologue_cache; |
| 74 | |
| 75 | return get_regcache_arch (cache->regcache); |
| 76 | } |
| 77 | |
| 78 | const struct frame_unwind sentinel_frame_unwind = |
| 79 | { |
| 80 | SENTINEL_FRAME, |
| 81 | default_frame_unwind_stop_reason, |
| 82 | sentinel_frame_this_id, |
| 83 | sentinel_frame_prev_register, |
| 84 | NULL, |
| 85 | NULL, |
| 86 | NULL, |
| 87 | sentinel_frame_prev_arch, |
| 88 | }; |