a94dd1fda2
* sentinel-frame.h, sentinel-frame.c: New files. * Makefile.in (frame.o): Update dependencies. (SFILES): Add sentinel-frame.c. (sentinel_frame_h): Define. (COMMON_OBS): Add sentinel-frame.o. (sentinel-frame.o): Specify dependencies. * frame.c: Include "sentinel-frame.h". (frame_register_unwind): Rewrite assuming that there is always a a ->next frame. (frame_register, generic_unwind_get_saved_register): Ditto. (frame_read_unsigned_register, frame_read_signed_register): Ditto. (create_sentinel_frame, unwind_to_current_frame): New functions. (get_current_frame): Rewrite using create_sentinel_frame and unwind_to_current_frame. When possible, always create a frame. (create_new_frame): Set next to the sentinel frame. (get_next_frame): Rewrite. Don't go below the level 0 frame. (deprecated_update_frame_pc_hack): Update the next frame's PC and ID cache when necessary. (frame_saved_regs_id_unwind): Use frame_relative_level. (deprecated_generic_get_saved_register): Use frame_relative_level, get_frame_saved_regs, get_frame_pc, get_frame_base and get_next_frame. (frame_saved_regs_register_unwind): Use get_frame_saved_regs and frame_register.
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/* Code dealing with register stack frames, for GDB, the GNU debugger.
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Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
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1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software
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Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "regcache.h"
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#include "sentinel-frame.h"
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#include "inferior.h"
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#include "frame-unwind.h"
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struct frame_unwind_cache
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{
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struct regcache *regcache;
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};
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void *
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sentinel_frame_cache (struct regcache *regcache)
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{
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struct frame_unwind_cache *cache =
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FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache);
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cache->regcache = regcache;
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return cache;
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}
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/* Here the register value is taken direct from the register cache. */
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void
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sentinel_frame_register_unwind (struct frame_info *frame,
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void **unwind_cache,
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int regnum, int *optimized,
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enum lval_type *lvalp, CORE_ADDR *addrp,
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int *realnum, void *bufferp)
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{
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struct frame_unwind_cache *cache = *unwind_cache;
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/* Describe the register's location. A reg-frame maps all registers
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onto the corresponding hardware register. */
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*optimized = 0;
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*lvalp = lval_register;
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*addrp = REGISTER_BYTE (regnum);
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*realnum = regnum;
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/* If needed, find and return the value of the register. */
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if (bufferp != NULL)
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{
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/* Return the actual value. */
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/* Use the regcache_cooked_read() method so that it, on the fly,
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constructs either a raw or pseudo register from the raw
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register cache. */
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regcache_cooked_read (cache->regcache, regnum, bufferp);
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}
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}
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CORE_ADDR
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sentinel_frame_pc_unwind (struct frame_info *frame,
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void **cache)
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{
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/* FIXME: cagney/2003-01-08: This should be using a per-architecture
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method that doesn't suffer from DECR_PC_AFTER_BREAK problems.
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Such a method would take unwind_cache, regcache and stop reason
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parameters. */
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return read_pc ();
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}
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void
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sentinel_frame_id_unwind (struct frame_info *frame,
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void **cache,
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struct frame_id *id)
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{
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/* FIXME: cagney/2003-01-08: This should be using a per-architecture
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method that doesn't suffer from DECR_PC_AFTER_BREAK problems.
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Such a method would take unwind_cache, regcache and stop reason
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parameters. */
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id->base = read_fp ();
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id->pc = read_pc ();
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}
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static void
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sentinel_frame_pop (struct frame_info *frame,
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void **cache,
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struct regcache *regcache)
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{
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internal_error (__FILE__, __LINE__, "Function sentinal_frame_pop called");
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}
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const struct frame_unwind sentinel_frame_unwinder =
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{
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sentinel_frame_pop,
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sentinel_frame_pc_unwind,
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sentinel_frame_id_unwind,
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sentinel_frame_register_unwind
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};
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const struct frame_unwind *const sentinel_frame_unwind = &sentinel_frame_unwinder;
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