690 lines
18 KiB
C
690 lines
18 KiB
C
/* Core dump and executable file functions below target vector, for GDB.
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Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996,
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1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005
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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., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "arch-utils.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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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h> /* needed for F_OK and friends */
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#endif
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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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#include "regcache.h"
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#include "regset.h"
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#include "symfile.h"
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#include "exec.h"
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#include "readline/readline.h"
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#include "observer.h"
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#include "gdb_assert.h"
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#include "exceptions.h"
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#include "solib.h"
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#ifndef O_LARGEFILE
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#define O_LARGEFILE 0
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#endif
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/* List of all available core_fns. On gdb startup, each core file
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register reader calls deprecated_add_core_fns() to register
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information on each core format it 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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/* FIXME: kettenis/20031023: Eventually this variable should
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disappear. */
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struct gdbarch *core_gdbarch = NULL;
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static void core_files_info (struct target_ops *);
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static struct core_fns *sniff_core_bfd (bfd *);
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static int gdb_check_format (bfd *);
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static void core_open (char *, int);
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static void core_detach (char *, int);
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static void core_close (int);
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static void core_close_cleanup (void *ignore);
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static void get_core_registers (int);
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static void add_to_thread_list (bfd *, asection *, void *);
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static int ignore (CORE_ADDR, bfd_byte *);
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static int core_file_thread_alive (ptid_t tid);
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static void init_core_ops (void);
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void _initialize_corelow (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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deprecated_add_core_fns (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 (struct core_fns *our_fns, 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 if 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 (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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/* Don't sniff if we have support for register sets in CORE_GDBARCH. */
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if (core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch))
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return NULL;
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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 (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 int
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gdb_check_format (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 (1);
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}
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}
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return (0);
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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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static void
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core_close (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_ptid = null_ptid; /* 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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#else
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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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xfree (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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xfree (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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core_gdbarch = NULL;
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}
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static void
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core_close_cleanup (void *ignore)
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{
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core_close (0/*ignored*/);
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}
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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 (void *from_ttyp)
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{
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#ifdef SOLIB_ADD
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SOLIB_ADD (NULL, *(int *) from_ttyp, ¤t_target, auto_solib_add);
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#else
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solib_add (NULL, *(int *)from_ttyp, ¤t_target, auto_solib_add);
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#endif
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re_enable_breakpoints_in_shlibs ();
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return 0;
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}
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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 (bfd *abfd, asection *asect, void *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 (pid_to_ptid (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_ptid = pid_to_ptid (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 (char *filename, 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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int flags;
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target_preopen (from_tty);
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if (!filename)
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{
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if (core_bfd)
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error (_("No core file specified. (Use `detach' to stop debugging a core file.)"));
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else
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error (_("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, (char *)NULL);
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xfree (filename);
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filename = temp;
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}
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old_chain = make_cleanup (xfree, filename);
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flags = O_BINARY | O_LARGEFILE;
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if (write_files)
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flags |= O_RDWR;
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else
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flags |= O_RDONLY;
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scratch_chan = open (filename, flags, 0);
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if (scratch_chan < 0)
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perror_with_name (filename);
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temp_bfd = bfd_fopen (filename, gnutarget,
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write_files ? FOPEN_RUB : FOPEN_RB,
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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_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 (core_close_cleanup, 0 /*ignore*/);
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/* FIXME: kettenis/20031023: This is very dangerous. The
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CORE_GDBARCH that results from this call may very well be
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different from CURRENT_GDBARCH. However, its methods may only
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work if it is selected as the current architecture, because they
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rely on swapped data (see gdbarch.c). We should get rid of that
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swapped data. */
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core_gdbarch = gdbarch_from_bfd (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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/* If we have no exec file, try to set the architecture from the
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core file. We don't do this unconditionally since an exec file
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typically contains more information that helps us determine the
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architecture than a core file. */
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if (!exec_bfd)
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set_gdbarch_from_file (core_bfd);
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ontop = !push_target (&core_ops);
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discard_cleanups (old_chain);
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/* This is done first, before anything has a chance to query the
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inferior for information such as symbols. */
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observer_notify_inferior_created (&core_ops, from_tty);
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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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/* NOTE: target_signal_from_host() converts a target signal value
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into gdb's internal signal value. Unfortunately gdb's internal
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value is called ``target_signal'' and this function got the
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name ..._from_host(). */
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printf_filtered (_("Program terminated with signal %d, %s.\n"), siggy,
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target_signal_to_string (target_signal_from_host (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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catch_errors (solib_add_stub, &from_tty, (char *) 0, RETURN_MASK_ALL);
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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 ());
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print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
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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 (char *args, 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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/* Try to retrieve registers from a section in core_bfd, and supply
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them to core_vec->core_read_registers, as the register set numbered
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WHICH.
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If inferior_ptid is zero, do the single-threaded thing: look for a
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section named NAME. If inferior_ptid is non-zero, do the
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multi-threaded thing: look for a section named "NAME/PID", where
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PID is the shortest ASCII decimal representation of inferior_ptid.
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HUMAN_NAME is a human-readable name for the kind of registers the
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NAME section contains, for use in error messages.
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If REQUIRED is non-zero, print an error if the core file doesn't
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have a section by the appropriate name. Otherwise, just do nothing. */
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static void
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get_core_register_section (char *name,
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int which,
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char *human_name,
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int required)
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{
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static char *section_name = NULL;
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struct bfd_section *section;
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bfd_size_type size;
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char *contents;
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xfree (section_name);
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if (PIDGET (inferior_ptid))
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section_name = xstrprintf ("%s/%d", name, PIDGET (inferior_ptid));
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else
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section_name = xstrdup (name);
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section = bfd_get_section_by_name (core_bfd, section_name);
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if (! section)
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{
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if (required)
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warning (_("Couldn't find %s registers in core file."), human_name);
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return;
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}
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size = bfd_section_size (core_bfd, section);
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contents = alloca (size);
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if (! bfd_get_section_contents (core_bfd, section, contents,
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(file_ptr) 0, size))
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{
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warning (_("Couldn't read %s registers from `%s' section in core file."),
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human_name, name);
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return;
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}
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if (core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch))
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{
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const struct regset *regset;
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regset = gdbarch_regset_from_core_section (core_gdbarch, name, size);
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if (regset == NULL)
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{
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if (required)
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warning (_("Couldn't recognize %s registers in core file."),
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human_name);
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return;
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}
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regset->supply_regset (regset, current_regcache, -1, contents, size);
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return;
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}
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gdb_assert (core_vec);
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core_vec->core_read_registers (contents, size, which,
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((CORE_ADDR)
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bfd_section_vma (core_bfd, section)));
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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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static void
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get_core_registers (int regno)
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{
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int status;
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if (!(core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch))
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&& (core_vec == NULL || core_vec->core_read_registers == 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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get_core_register_section (".reg", 0, "general-purpose", 1);
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get_core_register_section (".reg2", 2, "floating-point", 0);
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get_core_register_section (".reg-xfp", 3, "extended floating-point", 0);
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deprecated_registers_fetched ();
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}
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static void
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core_files_info (struct target_ops *t)
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{
|
||
print_section_info (t, core_bfd);
|
||
}
|
||
|
||
static LONGEST
|
||
core_xfer_partial (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
|
||
{
|
||
switch (object)
|
||
{
|
||
case TARGET_OBJECT_MEMORY:
|
||
if (readbuf)
|
||
return (*ops->deprecated_xfer_memory) (offset, readbuf, len,
|
||
0/*write*/, NULL, ops);
|
||
if (writebuf)
|
||
return (*ops->deprecated_xfer_memory) (offset, readbuf, len,
|
||
1/*write*/, NULL, ops);
|
||
return -1;
|
||
|
||
case TARGET_OBJECT_AUXV:
|
||
if (readbuf)
|
||
{
|
||
/* When the aux vector is stored in core file, BFD
|
||
represents this with a fake section called ".auxv". */
|
||
|
||
struct bfd_section *section;
|
||
bfd_size_type size;
|
||
char *contents;
|
||
|
||
section = bfd_get_section_by_name (core_bfd, ".auxv");
|
||
if (section == NULL)
|
||
return -1;
|
||
|
||
size = bfd_section_size (core_bfd, section);
|
||
if (offset >= size)
|
||
return 0;
|
||
size -= offset;
|
||
if (size > len)
|
||
size = len;
|
||
if (size > 0
|
||
&& !bfd_get_section_contents (core_bfd, section, readbuf,
|
||
(file_ptr) offset, size))
|
||
{
|
||
warning (_("Couldn't read NT_AUXV note in core file."));
|
||
return -1;
|
||
}
|
||
|
||
return size;
|
||
}
|
||
return -1;
|
||
|
||
case TARGET_OBJECT_WCOOKIE:
|
||
if (readbuf)
|
||
{
|
||
/* When the StackGhost cookie is stored in core file, BFD
|
||
represents this with a fake section called ".wcookie". */
|
||
|
||
struct bfd_section *section;
|
||
bfd_size_type size;
|
||
char *contents;
|
||
|
||
section = bfd_get_section_by_name (core_bfd, ".wcookie");
|
||
if (section == NULL)
|
||
return -1;
|
||
|
||
size = bfd_section_size (core_bfd, section);
|
||
if (offset >= size)
|
||
return 0;
|
||
size -= offset;
|
||
if (size > len)
|
||
size = len;
|
||
if (size > 0
|
||
&& !bfd_get_section_contents (core_bfd, section, readbuf,
|
||
(file_ptr) offset, size))
|
||
{
|
||
warning (_("Couldn't read StackGhost cookie in core file."));
|
||
return -1;
|
||
}
|
||
|
||
return size;
|
||
}
|
||
return -1;
|
||
|
||
default:
|
||
if (ops->beneath != NULL)
|
||
return ops->beneath->to_xfer_partial (ops->beneath, object, annex,
|
||
readbuf, writebuf, offset, len);
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
|
||
/* If mourn is being called in all the right places, this could be say
|
||
`gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
|
||
|
||
static int
|
||
ignore (CORE_ADDR addr, bfd_byte *contents)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Okay, let's be honest: threads gleaned from a core file aren't
|
||
exactly lively, are they? On the other hand, if we don't claim
|
||
that each & every one is alive, then we don't get any of them
|
||
to appear in an "info thread" command, which is quite a useful
|
||
behaviour.
|
||
*/
|
||
static int
|
||
core_file_thread_alive (ptid_t tid)
|
||
{
|
||
return 1;
|
||
}
|
||
|
||
/* Fill in core_ops with its defined operations and properties. */
|
||
|
||
static void
|
||
init_core_ops (void)
|
||
{
|
||
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_detach = core_detach;
|
||
core_ops.to_fetch_registers = get_core_registers;
|
||
core_ops.to_xfer_partial = core_xfer_partial;
|
||
core_ops.deprecated_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_thread_alive = core_file_thread_alive;
|
||
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 (void)
|
||
{
|
||
init_core_ops ();
|
||
|
||
if (!coreops_suppress_target)
|
||
add_target (&core_ops);
|
||
}
|