1 /* Code dealing with register stack frames, for GDB, the GNU debugger. 2 3 Copyright (C) 1986-2002, 2007-2012 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 }; 89