2004-03-23 Andrew Cagney <cagney@redhat.com>
* tramp-frame.h, tramp-frame.h: New files. * Makefile.in (SFILES, tramp_frame_h, COMMON_OBS, tramp-frame.o): Update rules to include "tramp-frame.h" and "tramp-frame.c".
This commit is contained in:
Andrew Cagney
parent
8050c72f30
commit
d2259dd367
@ -1,5 +1,9 @@
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2004-03-23 Andrew Cagney <cagney@redhat.com>
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* tramp-frame.h, tramp-frame.h: New files.
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* Makefile.in (SFILES, tramp_frame_h, COMMON_OBS, tramp-frame.o):
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Update rules to include "tramp-frame.h" and "tramp-frame.c".
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* Makefile.in: Update all dependencies.
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2004-03-23 Andrew Cagney <cagney@redhat.com>
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@ -541,6 +541,7 @@ SFILES = ada-exp.y ada-lang.c ada-typeprint.c ada-valprint.c ada-tasks.c \
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stabsread.c stack.c std-regs.c symfile.c symmisc.c symtab.c \
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target.c thread.c top.c tracepoint.c \
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trad-frame.c \
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tramp-frame.c \
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typeprint.c \
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ui-out.c utils.c ui-file.h ui-file.c \
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user-regs.c \
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@ -757,6 +758,7 @@ terminal_h = terminal.h
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top_h = top.h
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tracepoint_h = tracepoint.h
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trad_frame_h = trad-frame.h $(frame_h)
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tramp_frame_h = tramp-frame.h
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typeprint_h = typeprint.h
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ui_file_h = ui-file.h
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ui_out_h = ui-out.h
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@ -905,7 +907,8 @@ COMMON_OBS = $(DEPFILES) $(YYOBJ) \
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gnu-v2-abi.o gnu-v3-abi.o hpacc-abi.o cp-abi.o cp-support.o \
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cp-namespace.o \
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reggroups.o \
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trad-frame.o
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trad-frame.o \
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tramp-frame.o
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TSOBS = inflow.o
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@ -2444,6 +2447,9 @@ tracepoint.o: tracepoint.c $(defs_h) $(symtab_h) $(frame_h) $(gdbtypes_h) \
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$(readline_history_h)
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trad-frame.o: trad-frame.c $(defs_h) $(frame_h) $(trad_frame_h) \
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$(regcache_h)
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tramp-frame.o: tramp-frame.c $(defs_h) $(tramp_frame_h) $(frame_unwind_h) \
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$(gdbcore_h) $(symtab_h) $(objfiles_h) $(target_h) $(trad_frame_h) \
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$(frame_base_h)
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typeprint.o: typeprint.c $(defs_h) $(gdb_obstack_h) $(bfd_h) $(symtab_h) \
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$(gdbtypes_h) $(expression_h) $(value_h) $(gdbcore_h) $(command_h) \
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$(gdbcmd_h) $(target_h) $(language_h) $(cp_abi_h) $(typeprint_h) \
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162
gdb/tramp-frame.c
Normal file
162
gdb/tramp-frame.c
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@ -0,0 +1,162 @@
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/* Signal trampoline unwinder, for GDB the GNU Debugger.
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Copyright 2004 Free Software 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 "tramp-frame.h"
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#include "frame-unwind.h"
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#include "gdbcore.h"
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#include "symtab.h"
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#include "objfiles.h"
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#include "target.h"
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#include "trad-frame.h"
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#include "frame-base.h"
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struct frame_data
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{
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const struct tramp_frame *tramp_frame;
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};
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struct tramp_frame_cache
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{
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CORE_ADDR func;
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const struct tramp_frame *tramp_frame;
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struct trad_frame_cache *trad_cache;
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};
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static struct trad_frame_cache *
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tramp_frame_cache (struct frame_info *next_frame,
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void **this_cache)
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{
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CORE_ADDR pc = frame_pc_unwind (next_frame);
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struct tramp_frame_cache *tramp_cache = (*this_cache);
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if (tramp_cache->trad_cache == NULL)
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{
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tramp_cache->trad_cache = trad_frame_cache_zalloc (next_frame);
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tramp_cache->tramp_frame->init (tramp_cache->tramp_frame,
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next_frame,
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tramp_cache->trad_cache,
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tramp_cache->func);
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}
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return tramp_cache->trad_cache;
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}
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static void
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tramp_frame_this_id (struct frame_info *next_frame,
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void **this_cache,
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struct frame_id *this_id)
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{
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struct trad_frame_cache *trad_cache
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= tramp_frame_cache (next_frame, this_cache);
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trad_frame_get_id (trad_cache, this_id);
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}
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static void
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tramp_frame_prev_register (struct frame_info *next_frame,
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void **this_cache,
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int prev_regnum,
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int *optimizedp,
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enum lval_type * lvalp,
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CORE_ADDR *addrp,
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int *realnump, void *valuep)
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{
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struct trad_frame_cache *trad_cache
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= tramp_frame_cache (next_frame, this_cache);
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trad_frame_get_register (trad_cache, next_frame, prev_regnum, optimizedp,
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lvalp, addrp, realnump, valuep);
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}
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static CORE_ADDR
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tramp_frame_start (CORE_ADDR pc, const struct tramp_frame *tramp)
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{
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int ti;
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/* Search through the trampoline for one that matches the
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instruction sequence around PC. */
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for (ti = 0; tramp->insn[ti] != 0; ti++)
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{
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CORE_ADDR func = pc - tramp->insn_size * ti;
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int i;
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for (i = 0; 1; i++)
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{
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bfd_byte buf[sizeof (LONGEST)];
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CORE_ADDR insn;
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if (tramp->insn[i] == 0)
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return func;
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if (target_read_memory (func + i * tramp->insn_size, buf,
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tramp->insn_size) != 0)
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break;
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insn = extract_unsigned_integer (buf, tramp->insn_size);
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if (tramp->insn[i] != insn)
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break;
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}
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}
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/* Trampoline doesn't match. */
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return 0;
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}
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static int
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tramp_frame_sniffer (const struct frame_unwind *self,
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struct frame_info *next_frame,
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void **this_cache)
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{
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const struct tramp_frame *tramp = self->unwind_data->tramp_frame;
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CORE_ADDR pc = frame_pc_unwind (next_frame);
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CORE_ADDR func;
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char *name;
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struct tramp_frame_cache *tramp_cache;
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/* If the function has a valid symbol name, it isn't a
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trampoline. */
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find_pc_partial_function (pc, &name, NULL, NULL);
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if (name != NULL)
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return 0;
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/* If the function lives in a valid section (even without a starting
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point) it isn't a trampoline. */
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if (find_pc_section (pc) != NULL)
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return 0;
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/* Finally, check that the trampoline matches at PC. */
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func = tramp_frame_start (pc, tramp);
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if (func == 0)
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return 0;
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tramp_cache = FRAME_OBSTACK_ZALLOC (struct tramp_frame_cache);
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tramp_cache->func = func;
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tramp_cache->tramp_frame = tramp;
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(*this_cache) = tramp_cache;
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return 1;
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}
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void
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tramp_frame_append (struct gdbarch *gdbarch,
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const struct tramp_frame *tramp_frame)
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{
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struct frame_data *data;
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struct frame_unwind *unwinder;
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data = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_data);
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unwinder = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind);
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data->tramp_frame = tramp_frame;
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unwinder->type = SIGTRAMP_FRAME;
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unwinder->unwind_data = data;
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unwinder->sniffer = tramp_frame_sniffer;
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unwinder->this_id = tramp_frame_this_id;
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unwinder->prev_register = tramp_frame_prev_register;
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frame_unwind_register_unwinder (gdbarch, unwinder);
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}
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64
gdb/tramp-frame.h
Normal file
64
gdb/tramp-frame.h
Normal file
@ -0,0 +1,64 @@
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/* Signal trampoline unwinder, for GDB the GNU Debugger.
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Copyright 2004 Free Software 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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#ifndef TRAMP_FRAME_H
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#define TRAMP_FRAME_H
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struct trad_frame;
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struct frame_info;
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struct trad_frame_cache;
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/* A trampoline consists of a small sequence of instructions placed at
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an unspecified location in the inferior's address space. The only
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identifying attribute of the trampoline's address is that it does
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not fall inside an object file's section.
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The only way to identify a trampoline is to perform a brute force
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examination of the instructions at and around the PC.
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This module provides a convent interface for performing that
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operation. */
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/* A trampoline descriptor. */
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struct tramp_frame
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{
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/* The trampoline's entire instruction sequence. Search for this in
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the inferior at or around the frame's PC. It is assumed that the
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PC is INSN_SIZE aligned, and that each element of TRAMP contains
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one INSN_SIZE instruction. It is also assumed that TRAMP[0]
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contains the first instruction of the trampoline and hence the
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address of the instruction matching TRAMP[0] is the trampoline's
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"func" address. */
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int insn_size;
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ULONGEST insn[8];
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/* Initialize a trad-frame cache corresponding to the tramp-frame.
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FUNC is the address of the instruction TRAMP[0] in memory. */
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void (*init) (const struct tramp_frame *self,
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struct frame_info *next_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func);
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};
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void tramp_frame_append (struct gdbarch *gdbarch,
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const struct tramp_frame *tramp);
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#endif
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