| 1 | /* Code dealing with register stack frames, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, |
| 4 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software |
| 5 | Foundation, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 22 | Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "regcache.h" |
| 27 | #include "sentinel-frame.h" |
| 28 | #include "inferior.h" |
| 29 | #include "frame-unwind.h" |
| 30 | |
| 31 | struct frame_unwind_cache |
| 32 | { |
| 33 | struct regcache *regcache; |
| 34 | }; |
| 35 | |
| 36 | void * |
| 37 | sentinel_frame_cache (struct regcache *regcache) |
| 38 | { |
| 39 | struct frame_unwind_cache *cache = |
| 40 | FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache); |
| 41 | cache->regcache = regcache; |
| 42 | return cache; |
| 43 | } |
| 44 | |
| 45 | /* Here the register value is taken direct from the register cache. */ |
| 46 | |
| 47 | static void |
| 48 | sentinel_frame_prev_register (struct frame_info *next_frame, |
| 49 | void **this_prologue_cache, |
| 50 | int regnum, int *optimized, |
| 51 | enum lval_type *lvalp, CORE_ADDR *addrp, |
| 52 | int *realnum, void *bufferp) |
| 53 | { |
| 54 | struct frame_unwind_cache *cache = *this_prologue_cache; |
| 55 | /* Describe the register's location. A reg-frame maps all registers |
| 56 | onto the corresponding hardware register. */ |
| 57 | *optimized = 0; |
| 58 | *lvalp = lval_register; |
| 59 | *addrp = register_offset_hack (current_gdbarch, regnum); |
| 60 | *realnum = regnum; |
| 61 | |
| 62 | /* If needed, find and return the value of the register. */ |
| 63 | if (bufferp != NULL) |
| 64 | { |
| 65 | /* Return the actual value. */ |
| 66 | /* Use the regcache_cooked_read() method so that it, on the fly, |
| 67 | constructs either a raw or pseudo register from the raw |
| 68 | register cache. */ |
| 69 | regcache_cooked_read (cache->regcache, regnum, bufferp); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | static void |
| 74 | sentinel_frame_this_id (struct frame_info *next_frame, |
| 75 | void **this_prologue_cache, |
| 76 | struct frame_id *this_id) |
| 77 | { |
| 78 | /* The sentinel frame is used as a starting point for creating the |
| 79 | previous (inner most) frame. That frame's THIS_ID method will be |
| 80 | called to determine the inner most frame's ID. Not this one. */ |
| 81 | internal_error (__FILE__, __LINE__, "sentinel_frame_this_id called"); |
| 82 | } |
| 83 | |
| 84 | const struct frame_unwind sentinel_frame_unwinder = |
| 85 | { |
| 86 | SENTINEL_FRAME, |
| 87 | sentinel_frame_this_id, |
| 88 | sentinel_frame_prev_register |
| 89 | }; |
| 90 | |
| 91 | const struct frame_unwind *const sentinel_frame_unwind = &sentinel_frame_unwinder; |