| /* 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 |
| 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 2 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, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| |
| #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 void |
| sentinel_frame_prev_register (struct frame_info *next_frame, |
| void **this_prologue_cache, |
| int regnum, int *optimized, |
| enum lval_type *lvalp, CORE_ADDR *addrp, |
| int *realnum, gdb_byte *bufferp) |
| { |
| struct frame_unwind_cache *cache = *this_prologue_cache; |
| /* Describe the register's location. A reg-frame maps all registers |
| onto the corresponding hardware register. */ |
| *optimized = 0; |
| *lvalp = lval_register; |
| *addrp = register_offset_hack (current_gdbarch, regnum); |
| *realnum = regnum; |
| |
| /* If needed, find and return the value of the register. */ |
| if (bufferp != NULL) |
| { |
| /* Return the actual value. */ |
| /* 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, bufferp); |
| } |
| } |
| |
| static void |
| sentinel_frame_this_id (struct frame_info *next_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 CORE_ADDR |
| sentinel_frame_prev_pc (struct frame_info *next_frame, |
| void **this_prologue_cache) |
| { |
| struct gdbarch *gdbarch = get_frame_arch (next_frame); |
| return gdbarch_unwind_pc (gdbarch, next_frame); |
| } |
| |
| const struct frame_unwind sentinel_frame_unwinder = |
| { |
| SENTINEL_FRAME, |
| sentinel_frame_this_id, |
| sentinel_frame_prev_register, |
| NULL, /* unwind_data */ |
| NULL, /* sniffer */ |
| sentinel_frame_prev_pc, |
| }; |
| |
| const struct frame_unwind *const sentinel_frame_unwind = &sentinel_frame_unwinder; |