593 lines
16 KiB
C
593 lines
16 KiB
C
/* Core dump and executable file functions below target vector, for GDB.
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Copyright 1986, 87, 89, 91, 92, 93, 94, 95, 96, 97, 1998
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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 "gdb_string.h"
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#include <errno.h>
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#include <signal.h>
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#include <fcntl.h>
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#include "frame.h" /* required by inferior.h */
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#include "inferior.h"
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#include "symtab.h"
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#include "command.h"
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#include "bfd.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "gdbthread.h"
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/* List of all available core_fns. On gdb startup, each core file register
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reader calls add_core_fns() to register information on each core format it
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is prepared to read. */
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static struct core_fns *core_file_fns = NULL;
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/* The core_fns for a core file handler that is prepared to read the core
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file currently open on core_bfd. */
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static struct core_fns *core_vec = NULL;
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static void core_files_info PARAMS ((struct target_ops *));
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#ifdef SOLIB_ADD
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static int solib_add_stub PARAMS ((PTR));
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#endif
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static struct core_fns *sniff_core_bfd PARAMS ((bfd *));
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static boolean gdb_check_format PARAMS ((bfd *));
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static void core_open PARAMS ((char *, int));
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static void core_detach PARAMS ((char *, int));
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static void core_close PARAMS ((int));
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static void get_core_registers PARAMS ((int));
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static void add_to_thread_list PARAMS ((bfd *, asection *, PTR));
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static int ignore PARAMS ((CORE_ADDR, char *));
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static char *core_file_to_sym_file PARAMS ((char *));
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static int core_file_thread_alive PARAMS ((int tid));
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static void init_core_ops PARAMS ((void));
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void _initialize_corelow PARAMS ((void));
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struct target_ops core_ops;
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/* Link a new core_fns into the global core_file_fns list. Called on gdb
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startup by the _initialize routine in each core file register reader, to
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register information about each format the the reader is prepared to
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handle. */
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void
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add_core_fns (cf)
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struct core_fns *cf;
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{
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cf->next = core_file_fns;
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core_file_fns = cf;
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}
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/* The default function that core file handlers can use to examine a
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core file BFD and decide whether or not to accept the job of
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reading the core file. */
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int
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default_core_sniffer (our_fns, abfd)
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struct core_fns *our_fns;
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bfd *abfd;
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{
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int result;
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result = (bfd_get_flavour (abfd) == our_fns -> core_flavour);
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return (result);
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}
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/* Walk through the list of core functions to find a set that can
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handle the core file open on ABFD. Default to the first one in the
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list of nothing matches. Returns pointer to set that is
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selected. */
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static struct core_fns *
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sniff_core_bfd (abfd)
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bfd *abfd;
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{
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struct core_fns *cf;
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struct core_fns *yummy = NULL;
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int matches = 0;;
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for (cf = core_file_fns; cf != NULL; cf = cf->next)
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{
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if (cf->core_sniffer (cf, abfd))
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{
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yummy = cf;
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matches++;
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}
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}
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if (matches > 1)
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{
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warning ("\"%s\": ambiguous core format, %d handlers match",
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bfd_get_filename (abfd), matches);
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}
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else if (matches == 0)
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{
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warning ("\"%s\": no core file handler recognizes format, using default",
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bfd_get_filename (abfd));
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}
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if (yummy == NULL)
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{
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yummy = core_file_fns;
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}
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return (yummy);
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}
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/* The default is to reject every core file format we see. Either
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BFD has to recognize it, or we have to provide a function in the
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core file handler that recognizes it. */
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int
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default_check_format (abfd)
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bfd *abfd;
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{
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return (0);
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}
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/* Attempt to recognize core file formats that BFD rejects. */
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static boolean
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gdb_check_format (abfd)
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bfd *abfd;
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{
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struct core_fns *cf;
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for (cf = core_file_fns; cf != NULL; cf = cf->next)
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{
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if (cf->check_format (abfd))
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{
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return (true);
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}
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}
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return (false);
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}
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/* Discard all vestiges of any previous core file and mark data and stack
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spaces as empty. */
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/* ARGSUSED */
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static void
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core_close (quitting)
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int quitting;
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{
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char *name;
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if (core_bfd)
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{
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inferior_pid = 0; /* Avoid confusion from thread stuff */
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/* Clear out solib state while the bfd is still open. See
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comments in clear_solib in solib.c. */
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#ifdef CLEAR_SOLIB
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CLEAR_SOLIB ();
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#endif
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name = bfd_get_filename (core_bfd);
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if (!bfd_close (core_bfd))
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warning ("cannot close \"%s\": %s",
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name, bfd_errmsg (bfd_get_error ()));
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free (name);
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core_bfd = NULL;
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if (core_ops.to_sections)
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{
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free ((PTR) core_ops.to_sections);
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core_ops.to_sections = NULL;
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core_ops.to_sections_end = NULL;
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}
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}
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core_vec = NULL;
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}
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#ifdef SOLIB_ADD
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/* Stub function for catch_errors around shared library hacking. FROM_TTYP
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is really an int * which points to from_tty. */
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static int
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solib_add_stub (from_ttyp)
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PTR from_ttyp;
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{
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SOLIB_ADD (NULL, *(int *) from_ttyp, ¤t_target);
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re_enable_breakpoints_in_shlibs ();
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return 0;
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}
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#endif /* SOLIB_ADD */
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/* Look for sections whose names start with `.reg/' so that we can extract the
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list of threads in a core file. */
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static void
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add_to_thread_list (abfd, asect, reg_sect_arg)
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bfd *abfd;
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asection *asect;
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PTR reg_sect_arg;
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{
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int thread_id;
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asection *reg_sect = (asection *) reg_sect_arg;
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if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0)
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return;
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thread_id = atoi (bfd_section_name (abfd, asect) + 5);
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add_thread (thread_id);
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/* Warning, Will Robinson, looking at BFD private data! */
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if (reg_sect != NULL
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&& asect->filepos == reg_sect->filepos) /* Did we find .reg? */
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inferior_pid = thread_id; /* Yes, make it current */
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}
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/* This routine opens and sets up the core file bfd. */
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static void
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core_open (filename, from_tty)
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char *filename;
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int from_tty;
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{
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const char *p;
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int siggy;
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struct cleanup *old_chain;
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char *temp;
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bfd *temp_bfd;
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int ontop;
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int scratch_chan;
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target_preopen (from_tty);
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if (!filename)
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{
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error (core_bfd ?
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"No core file specified. (Use `detach' to stop debugging a core file.)"
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: "No core file specified.");
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}
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filename = tilde_expand (filename);
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if (filename[0] != '/')
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{
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temp = concat (current_directory, "/", filename, NULL);
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free (filename);
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filename = temp;
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}
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old_chain = make_cleanup (free, filename);
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scratch_chan = open (filename, write_files ? O_RDWR : O_RDONLY, 0);
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if (scratch_chan < 0)
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perror_with_name (filename);
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temp_bfd = bfd_fdopenr (filename, gnutarget, scratch_chan);
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if (temp_bfd == NULL)
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perror_with_name (filename);
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if (!bfd_check_format (temp_bfd, bfd_core) &&
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!gdb_check_format (temp_bfd))
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{
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/* Do it after the err msg */
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/* FIXME: should be checking for errors from bfd_close (for one thing,
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on error it does not free all the storage associated with the
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bfd). */
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make_cleanup ((make_cleanup_func) bfd_close, temp_bfd);
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error ("\"%s\" is not a core dump: %s",
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filename, bfd_errmsg (bfd_get_error ()));
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}
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/* Looks semi-reasonable. Toss the old core file and work on the new. */
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discard_cleanups (old_chain); /* Don't free filename any more */
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unpush_target (&core_ops);
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core_bfd = temp_bfd;
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old_chain = make_cleanup ((make_cleanup_func) core_close, core_bfd);
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/* Find a suitable core file handler to munch on core_bfd */
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core_vec = sniff_core_bfd (core_bfd);
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validate_files ();
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/* Find the data section */
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if (build_section_table (core_bfd, &core_ops.to_sections,
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&core_ops.to_sections_end))
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error ("\"%s\": Can't find sections: %s",
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bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ()));
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ontop = !push_target (&core_ops);
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discard_cleanups (old_chain);
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p = bfd_core_file_failing_command (core_bfd);
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if (p)
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printf_filtered ("Core was generated by `%s'.\n", p);
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siggy = bfd_core_file_failing_signal (core_bfd);
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if (siggy > 0)
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printf_filtered ("Program terminated with signal %d, %s.\n", siggy,
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safe_strsignal (siggy));
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/* Build up thread list from BFD sections. */
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init_thread_list ();
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bfd_map_over_sections (core_bfd, add_to_thread_list,
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bfd_get_section_by_name (core_bfd, ".reg"));
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if (ontop)
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{
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/* Fetch all registers from core file. */
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target_fetch_registers (-1);
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/* Add symbols and section mappings for any shared libraries. */
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#ifdef SOLIB_ADD
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catch_errors (solib_add_stub, &from_tty, (char *) 0,
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RETURN_MASK_ALL);
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#endif
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/* Now, set up the frame cache, and print the top of stack. */
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flush_cached_frames ();
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select_frame (get_current_frame (), 0);
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print_stack_frame (selected_frame, selected_frame_level, 1);
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}
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else
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{
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warning (
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"you won't be able to access this core file until you terminate\n\
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your %s; do ``info files''", target_longname);
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}
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}
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static void
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core_detach (args, from_tty)
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char *args;
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int from_tty;
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{
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if (args)
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error ("Too many arguments");
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unpush_target (&core_ops);
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reinit_frame_cache ();
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if (from_tty)
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printf_filtered ("No core file now.\n");
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}
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/* Get the registers out of a core file. This is the machine-
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independent part. Fetch_core_registers is the machine-dependent
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part, typically implemented in the xm-file for each architecture. */
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/* We just get all the registers, so we don't use regno. */
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/* ARGSUSED */
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static void
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get_core_registers (regno)
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int regno;
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{
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sec_ptr reg_sec;
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unsigned size;
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char *the_regs;
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char secname[30];
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if (core_vec == NULL)
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{
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fprintf_filtered (gdb_stderr,
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"Can't fetch registers from this type of core file\n");
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return;
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}
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/* Thread support. If inferior_pid is non-zero, then we have found a core
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file with threads (or multiple processes). In that case, we need to
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use the appropriate register section, else we just use `.reg'. */
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/* XXX - same thing needs to be done for floating-point (.reg2) sections. */
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if (inferior_pid)
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sprintf (secname, ".reg/%d", inferior_pid);
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else
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strcpy (secname, ".reg");
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reg_sec = bfd_get_section_by_name (core_bfd, secname);
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if (!reg_sec)
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goto cant;
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size = bfd_section_size (core_bfd, reg_sec);
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the_regs = alloca (size);
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if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr) 0, size) &&
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core_vec->core_read_registers != NULL)
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{
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(core_vec->core_read_registers (the_regs, size, 0,
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(unsigned) bfd_section_vma (abfd, reg_sec)));
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}
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else
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{
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cant:
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fprintf_filtered (gdb_stderr,
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"Couldn't fetch registers from core file: %s\n",
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bfd_errmsg (bfd_get_error ()));
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}
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/* Now do it again for the float registers, if they exist. */
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reg_sec = bfd_get_section_by_name (core_bfd, ".reg2");
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if (reg_sec)
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{
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size = bfd_section_size (core_bfd, reg_sec);
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the_regs = alloca (size);
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if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr) 0, size) &&
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core_vec->core_read_registers != NULL)
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{
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(core_vec->core_read_registers (the_regs, size, 2,
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(unsigned) bfd_section_vma (abfd, reg_sec)));
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}
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else
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{
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fprintf_filtered (gdb_stderr,
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"Couldn't fetch register set 2 from core file: %s\n",
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bfd_errmsg (bfd_get_error ()));
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}
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}
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registers_fetched ();
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}
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static char *
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core_file_to_sym_file (core)
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char *core;
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{
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CONST char *failing_command;
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char *p;
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char *temp;
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bfd *temp_bfd;
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int scratch_chan;
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if (!core)
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error ("No core file specified.");
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core = tilde_expand (core);
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if (core[0] != '/')
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{
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temp = concat (current_directory, "/", core, NULL);
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core = temp;
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}
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scratch_chan = open (core, write_files ? O_RDWR : O_RDONLY, 0);
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if (scratch_chan < 0)
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perror_with_name (core);
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temp_bfd = bfd_fdopenr (core, gnutarget, scratch_chan);
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if (temp_bfd == NULL)
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perror_with_name (core);
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if (!bfd_check_format (temp_bfd, bfd_core))
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{
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/* Do it after the err msg */
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/* FIXME: should be checking for errors from bfd_close (for one thing,
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on error it does not free all the storage associated with the
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bfd). */
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make_cleanup ((make_cleanup_func) bfd_close, temp_bfd);
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error ("\"%s\" is not a core dump: %s",
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core, bfd_errmsg (bfd_get_error ()));
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}
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/* Find the data section */
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if (build_section_table (temp_bfd, &core_ops.to_sections,
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&core_ops.to_sections_end))
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error ("\"%s\": Can't find sections: %s",
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bfd_get_filename (temp_bfd), bfd_errmsg (bfd_get_error ()));
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failing_command = bfd_core_file_failing_command (temp_bfd);
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bfd_close (temp_bfd);
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/* If we found a filename, remember that it is probably saved
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relative to the executable that created it. If working directory
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isn't there now, we may not be able to find the executable. Rather
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than trying to be sauve about finding it, just check if the file
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exists where we are now. If not, then punt and tell our client
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we couldn't find the sym file.
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*/
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p = (char *) failing_command;
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if ((p != NULL) && (access (p, F_OK) != 0))
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p = NULL;
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return p;
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}
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static void
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core_files_info (t)
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struct target_ops *t;
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{
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print_section_info (t, core_bfd);
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}
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/* If mourn is being called in all the right places, this could be say
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`gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
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static int
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ignore (addr, contents)
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CORE_ADDR addr;
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char *contents;
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{
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return 0;
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}
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/* Okay, let's be honest: threads gleaned from a core file aren't
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exactly lively, are they? On the other hand, if we don't claim
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that each & every one is alive, then we don't get any of them
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to appear in an "info thread" command, which is quite a useful
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behaviour.
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*/
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static int
|
||
core_file_thread_alive (tid)
|
||
int tid;
|
||
{
|
||
return 1;
|
||
}
|
||
|
||
/* Fill in core_ops with its defined operations and properties. */
|
||
|
||
static void
|
||
init_core_ops ()
|
||
{
|
||
core_ops.to_shortname = "core";
|
||
core_ops.to_longname = "Local core dump file";
|
||
core_ops.to_doc =
|
||
"Use a core file as a target. Specify the filename of the core file.";
|
||
core_ops.to_open = core_open;
|
||
core_ops.to_close = core_close;
|
||
core_ops.to_attach = find_default_attach;
|
||
core_ops.to_require_attach = find_default_require_attach;
|
||
core_ops.to_detach = core_detach;
|
||
core_ops.to_require_detach = find_default_require_detach;
|
||
core_ops.to_fetch_registers = get_core_registers;
|
||
core_ops.to_xfer_memory = xfer_memory;
|
||
core_ops.to_files_info = core_files_info;
|
||
core_ops.to_insert_breakpoint = ignore;
|
||
core_ops.to_remove_breakpoint = ignore;
|
||
core_ops.to_create_inferior = find_default_create_inferior;
|
||
core_ops.to_clone_and_follow_inferior = find_default_clone_and_follow_inferior;
|
||
core_ops.to_thread_alive = core_file_thread_alive;
|
||
core_ops.to_core_file_to_sym_file = core_file_to_sym_file;
|
||
core_ops.to_stratum = core_stratum;
|
||
core_ops.to_has_memory = 1;
|
||
core_ops.to_has_stack = 1;
|
||
core_ops.to_has_registers = 1;
|
||
core_ops.to_magic = OPS_MAGIC;
|
||
}
|
||
|
||
/* non-zero if we should not do the add_target call in
|
||
_initialize_corelow; not initialized (i.e., bss) so that
|
||
the target can initialize it (i.e., data) if appropriate.
|
||
This needs to be set at compile time because we don't know
|
||
for sure whether the target's initialize routine is called
|
||
before us or after us. */
|
||
int coreops_suppress_target;
|
||
|
||
void
|
||
_initialize_corelow ()
|
||
{
|
||
init_core_ops ();
|
||
|
||
if (!coreops_suppress_target)
|
||
add_target (&core_ops);
|
||
}
|