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[/] [openrisc/] [tags/] [gdb/] [gdb-6.8/] [gdb-6.8.openrisc-2.1/] [gdb/] [sentinel-frame.c] - Rev 33
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/* 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 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 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 = 0; *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;