1044 lines
28 KiB
C
1044 lines
28 KiB
C
/* Core dump and executable file functions below target vector, for GDB.
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Copyright (C) 1986-2017 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "arch-utils.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 "infrun.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 "solib.h"
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#include "filenames.h"
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#include "progspace.h"
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#include "objfiles.h"
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#include "gdb_bfd.h"
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#include "completer.h"
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#include "filestuff.h"
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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
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core 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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static struct gdbarch *core_gdbarch = NULL;
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/* Per-core data. Currently, only the section table. Note that these
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target sections are *not* mapped in the current address spaces' set
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of target sections --- those should come only from pure executable
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or shared library bfds. The core bfd sections are an
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implementation detail of the core target, just like ptrace is for
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unix child targets. */
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static struct target_section_table *core_data;
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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_close (struct target_ops *self);
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static void core_close_cleanup (void *ignore);
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static void add_to_thread_list (bfd *, asection *, void *);
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static void init_core_ops (void);
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static struct target_ops core_ops;
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/* An arbitrary identifier for the core inferior. */
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#define CORELOW_PID 1
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/* Link a new core_fns into the global core_file_fns list. Called on
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gdb startup by the _initialize routine in each core file register
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reader, to register information about each format the reader is
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prepared to 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. 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
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CORE_GDBARCH. */
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if (core_gdbarch && gdbarch_iterate_over_regset_sections_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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error (_("\"%s\": no core file handler recognizes format"),
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bfd_get_filename (abfd));
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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
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stack spaces as empty. */
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static void
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core_close (struct target_ops *self)
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{
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if (core_bfd)
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{
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int pid = ptid_get_pid (inferior_ptid);
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inferior_ptid = null_ptid; /* Avoid confusion from thread
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stuff. */
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if (pid != 0)
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exit_inferior_silent (pid);
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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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clear_solib ();
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if (core_data)
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{
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xfree (core_data->sections);
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xfree (core_data);
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core_data = NULL;
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}
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gdb_bfd_unref (core_bfd);
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core_bfd = NULL;
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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 (NULL);
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}
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/* Look for sections whose names start with `.reg/' so that we can
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extract the 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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ptid_t ptid;
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int core_tid;
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int pid, lwpid;
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asection *reg_sect = (asection *) reg_sect_arg;
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int fake_pid_p = 0;
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struct inferior *inf;
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if (!startswith (bfd_section_name (abfd, asect), ".reg/"))
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return;
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core_tid = atoi (bfd_section_name (abfd, asect) + 5);
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pid = bfd_core_file_pid (core_bfd);
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if (pid == 0)
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{
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fake_pid_p = 1;
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pid = CORELOW_PID;
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}
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lwpid = core_tid;
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inf = current_inferior ();
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if (inf->pid == 0)
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{
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inferior_appeared (inf, pid);
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inf->fake_pid_p = fake_pid_p;
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}
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ptid = ptid_build (pid, lwpid, 0);
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add_thread (ptid);
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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 = ptid; /* 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 (const char *arg, 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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int scratch_chan;
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int flags;
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target_preopen (from_tty);
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if (!arg)
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{
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if (core_bfd)
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error (_("No core file specified. (Use `detach' "
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"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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gdb::unique_xmalloc_ptr<char> filename (tilde_expand (arg));
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if (!IS_ABSOLUTE_PATH (filename.get ()))
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filename.reset (concat (current_directory, "/",
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filename.get (), (char *) NULL));
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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 = gdb_open_cloexec (filename.get (), flags, 0);
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if (scratch_chan < 0)
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perror_with_name (filename.get ());
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gdb_bfd_ref_ptr temp_bfd (gdb_bfd_fopen (filename.get (), 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.get ());
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if (!bfd_check_format (temp_bfd.get (), bfd_core)
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&& !gdb_check_format (temp_bfd.get ()))
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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
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thing, on error it does not free all the storage associated
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with the bfd). */
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error (_("\"%s\" is not a core dump: %s"),
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filename.get (), 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
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new. */
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unpush_target (&core_ops);
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core_bfd = temp_bfd.release ();
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old_chain = make_cleanup (core_close_cleanup, 0 /*ignore*/);
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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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core_data = XCNEW (struct target_section_table);
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/* Find the data section */
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if (build_section_table (core_bfd,
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&core_data->sections,
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&core_data->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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push_target (&core_ops);
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discard_cleanups (old_chain);
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/* Do this before acknowledging the inferior, so if
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post_create_inferior throws (can happen easilly if you're loading
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a core file with the wrong exec), we aren't left with threads
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from the previous inferior. */
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init_thread_list ();
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inferior_ptid = null_ptid;
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/* Need to flush the register cache (and the frame cache) from a
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previous debug session. If inferior_ptid ends up the same as the
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last debug session --- e.g., b foo; run; gcore core1; step; gcore
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core2; core core1; core core2 --- then there's potential for
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get_current_regcache to return the cached regcache of the
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previous session, and the frame cache being stale. */
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registers_changed ();
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/* Build up thread list from BFD sections, and possibly set the
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current thread to the .reg/NN section matching the .reg
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section. */
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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 (ptid_equal (inferior_ptid, null_ptid))
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{
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/* Either we found no .reg/NN section, and hence we have a
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non-threaded core (single-threaded, from gdb's perspective),
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or for some reason add_to_thread_list couldn't determine
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which was the "main" thread. The latter case shouldn't
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usually happen, but we're dealing with input here, which can
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always be broken in different ways. */
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struct thread_info *thread = first_thread_of_process (-1);
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if (thread == NULL)
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{
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inferior_appeared (current_inferior (), CORELOW_PID);
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inferior_ptid = pid_to_ptid (CORELOW_PID);
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add_thread_silent (inferior_ptid);
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}
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else
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switch_to_thread (thread->ptid);
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}
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post_create_inferior (&core_ops, from_tty);
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/* Now go through the target stack looking for threads since there
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may be a thread_stratum target loaded on top of target core by
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now. The layer above should claim threads found in the BFD
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sections. */
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TRY
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{
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target_update_thread_list ();
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}
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CATCH (except, RETURN_MASK_ERROR)
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{
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exception_print (gdb_stderr, except);
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}
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END_CATCH
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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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/* Clearing any previous state of convenience variables. */
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clear_exit_convenience_vars ();
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siggy = bfd_core_file_failing_signal (core_bfd);
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if (siggy > 0)
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{
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/* If we don't have a CORE_GDBARCH to work with, assume a native
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core (map gdb_signal from host signals). If we do have
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CORE_GDBARCH to work with, but no gdb_signal_from_target
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implementation for that gdbarch, as a fallback measure,
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assume the host signal mapping. It'll be correct for native
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cores, but most likely incorrect for cross-cores. */
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enum gdb_signal sig = (core_gdbarch != NULL
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&& gdbarch_gdb_signal_from_target_p (core_gdbarch)
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? gdbarch_gdb_signal_from_target (core_gdbarch,
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siggy)
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: gdb_signal_from_host (siggy));
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printf_filtered (_("Program terminated with signal %s, %s.\n"),
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gdb_signal_to_name (sig), gdb_signal_to_string (sig));
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||
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/* Set the value of the internal variable $_exitsignal,
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which holds the signal uncaught by the inferior. */
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set_internalvar_integer (lookup_internalvar ("_exitsignal"),
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siggy);
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||
}
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||
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/* Fetch all registers from core file. */
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target_fetch_registers (get_current_regcache (), -1);
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||
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/* Now, set up the frame cache, and print the top of stack. */
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||
reinit_frame_cache ();
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print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
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||
|
||
/* Current thread should be NUM 1 but the user does not know that.
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||
If a program is single threaded gdb in general does not mention
|
||
anything about threads. That is why the test is >= 2. */
|
||
if (thread_count () >= 2)
|
||
{
|
||
TRY
|
||
{
|
||
thread_command (NULL, from_tty);
|
||
}
|
||
CATCH (except, RETURN_MASK_ERROR)
|
||
{
|
||
exception_print (gdb_stderr, except);
|
||
}
|
||
END_CATCH
|
||
}
|
||
}
|
||
|
||
static void
|
||
core_detach (struct target_ops *ops, const char *args, int from_tty)
|
||
{
|
||
if (args)
|
||
error (_("Too many arguments"));
|
||
unpush_target (ops);
|
||
reinit_frame_cache ();
|
||
if (from_tty)
|
||
printf_filtered (_("No core file now.\n"));
|
||
}
|
||
|
||
/* Try to retrieve registers from a section in core_bfd, and supply
|
||
them to core_vec->core_read_registers, as the register set numbered
|
||
WHICH.
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||
|
||
If ptid's lwp member is zero, do the single-threaded
|
||
thing: look for a section named NAME. If ptid's lwp
|
||
member is non-zero, do the multi-threaded thing: look for a section
|
||
named "NAME/LWP", where LWP is the shortest ASCII decimal
|
||
representation of ptid's lwp member.
|
||
|
||
HUMAN_NAME is a human-readable name for the kind of registers the
|
||
NAME section contains, for use in error messages.
|
||
|
||
If REQUIRED is non-zero, print an error if the core file doesn't
|
||
have a section by the appropriate name. Otherwise, just do
|
||
nothing. */
|
||
|
||
static void
|
||
get_core_register_section (struct regcache *regcache,
|
||
const struct regset *regset,
|
||
const char *name,
|
||
int min_size,
|
||
int which,
|
||
const char *human_name,
|
||
int required)
|
||
{
|
||
struct bfd_section *section;
|
||
bfd_size_type size;
|
||
char *contents;
|
||
bool variable_size_section = (regset != NULL
|
||
&& regset->flags & REGSET_VARIABLE_SIZE);
|
||
|
||
thread_section_name section_name (name, regcache->ptid ());
|
||
|
||
section = bfd_get_section_by_name (core_bfd, section_name.c_str ());
|
||
if (! section)
|
||
{
|
||
if (required)
|
||
warning (_("Couldn't find %s registers in core file."),
|
||
human_name);
|
||
return;
|
||
}
|
||
|
||
size = bfd_section_size (core_bfd, section);
|
||
if (size < min_size)
|
||
{
|
||
warning (_("Section `%s' in core file too small."),
|
||
section_name.c_str ());
|
||
return;
|
||
}
|
||
if (size != min_size && !variable_size_section)
|
||
{
|
||
warning (_("Unexpected size of section `%s' in core file."),
|
||
section_name.c_str ());
|
||
}
|
||
|
||
contents = (char *) alloca (size);
|
||
if (! bfd_get_section_contents (core_bfd, section, contents,
|
||
(file_ptr) 0, size))
|
||
{
|
||
warning (_("Couldn't read %s registers from `%s' section in core file."),
|
||
human_name, section_name.c_str ());
|
||
return;
|
||
}
|
||
|
||
if (regset != NULL)
|
||
{
|
||
regset->supply_regset (regset, regcache, -1, contents, size);
|
||
return;
|
||
}
|
||
|
||
gdb_assert (core_vec);
|
||
core_vec->core_read_registers (regcache, contents, size, which,
|
||
((CORE_ADDR)
|
||
bfd_section_vma (core_bfd, section)));
|
||
}
|
||
|
||
/* Callback for get_core_registers that handles a single core file
|
||
register note section. */
|
||
|
||
static void
|
||
get_core_registers_cb (const char *sect_name, int size,
|
||
const struct regset *regset,
|
||
const char *human_name, void *cb_data)
|
||
{
|
||
struct regcache *regcache = (struct regcache *) cb_data;
|
||
int required = 0;
|
||
|
||
if (strcmp (sect_name, ".reg") == 0)
|
||
{
|
||
required = 1;
|
||
if (human_name == NULL)
|
||
human_name = "general-purpose";
|
||
}
|
||
else if (strcmp (sect_name, ".reg2") == 0)
|
||
{
|
||
if (human_name == NULL)
|
||
human_name = "floating-point";
|
||
}
|
||
|
||
/* The 'which' parameter is only used when no regset is provided.
|
||
Thus we just set it to -1. */
|
||
get_core_register_section (regcache, regset, sect_name,
|
||
size, -1, human_name, required);
|
||
}
|
||
|
||
/* Get the registers out of a core file. This is the machine-
|
||
independent part. Fetch_core_registers is the machine-dependent
|
||
part, typically implemented in the xm-file for each
|
||
architecture. */
|
||
|
||
/* We just get all the registers, so we don't use regno. */
|
||
|
||
static void
|
||
get_core_registers (struct target_ops *ops,
|
||
struct regcache *regcache, int regno)
|
||
{
|
||
int i;
|
||
struct gdbarch *gdbarch;
|
||
|
||
if (!(core_gdbarch && gdbarch_iterate_over_regset_sections_p (core_gdbarch))
|
||
&& (core_vec == NULL || core_vec->core_read_registers == NULL))
|
||
{
|
||
fprintf_filtered (gdb_stderr,
|
||
"Can't fetch registers from this type of core file\n");
|
||
return;
|
||
}
|
||
|
||
gdbarch = regcache->arch ();
|
||
if (gdbarch_iterate_over_regset_sections_p (gdbarch))
|
||
gdbarch_iterate_over_regset_sections (gdbarch,
|
||
get_core_registers_cb,
|
||
(void *) regcache, NULL);
|
||
else
|
||
{
|
||
get_core_register_section (regcache, NULL,
|
||
".reg", 0, 0, "general-purpose", 1);
|
||
get_core_register_section (regcache, NULL,
|
||
".reg2", 0, 2, "floating-point", 0);
|
||
}
|
||
|
||
/* Mark all registers not found in the core as unavailable. */
|
||
for (i = 0; i < gdbarch_num_regs (regcache->arch ()); i++)
|
||
if (regcache_register_status (regcache, i) == REG_UNKNOWN)
|
||
regcache_raw_supply (regcache, i, NULL);
|
||
}
|
||
|
||
static void
|
||
core_files_info (struct target_ops *t)
|
||
{
|
||
print_section_info (core_data, core_bfd);
|
||
}
|
||
|
||
struct spuid_list
|
||
{
|
||
gdb_byte *buf;
|
||
ULONGEST offset;
|
||
LONGEST len;
|
||
ULONGEST pos;
|
||
ULONGEST written;
|
||
};
|
||
|
||
static void
|
||
add_to_spuid_list (bfd *abfd, asection *asect, void *list_p)
|
||
{
|
||
struct spuid_list *list = (struct spuid_list *) list_p;
|
||
enum bfd_endian byte_order
|
||
= bfd_big_endian (abfd) ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
|
||
int fd, pos = 0;
|
||
|
||
sscanf (bfd_section_name (abfd, asect), "SPU/%d/regs%n", &fd, &pos);
|
||
if (pos == 0)
|
||
return;
|
||
|
||
if (list->pos >= list->offset && list->pos + 4 <= list->offset + list->len)
|
||
{
|
||
store_unsigned_integer (list->buf + list->pos - list->offset,
|
||
4, byte_order, fd);
|
||
list->written += 4;
|
||
}
|
||
list->pos += 4;
|
||
}
|
||
|
||
static enum target_xfer_status
|
||
core_xfer_partial (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf, ULONGEST offset,
|
||
ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
switch (object)
|
||
{
|
||
case TARGET_OBJECT_MEMORY:
|
||
return section_table_xfer_memory_partial (readbuf, writebuf,
|
||
offset, len, xfered_len,
|
||
core_data->sections,
|
||
core_data->sections_end,
|
||
NULL);
|
||
|
||
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;
|
||
|
||
section = bfd_get_section_by_name (core_bfd, ".auxv");
|
||
if (section == NULL)
|
||
return TARGET_XFER_E_IO;
|
||
|
||
size = bfd_section_size (core_bfd, section);
|
||
if (offset >= size)
|
||
return TARGET_XFER_EOF;
|
||
size -= offset;
|
||
if (size > len)
|
||
size = len;
|
||
|
||
if (size == 0)
|
||
return TARGET_XFER_EOF;
|
||
if (!bfd_get_section_contents (core_bfd, section, readbuf,
|
||
(file_ptr) offset, size))
|
||
{
|
||
warning (_("Couldn't read NT_AUXV note in core file."));
|
||
return TARGET_XFER_E_IO;
|
||
}
|
||
|
||
*xfered_len = (ULONGEST) size;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
return TARGET_XFER_E_IO;
|
||
|
||
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;
|
||
|
||
section = bfd_get_section_by_name (core_bfd, ".wcookie");
|
||
if (section == NULL)
|
||
return TARGET_XFER_E_IO;
|
||
|
||
size = bfd_section_size (core_bfd, section);
|
||
if (offset >= size)
|
||
return TARGET_XFER_EOF;
|
||
size -= offset;
|
||
if (size > len)
|
||
size = len;
|
||
|
||
if (size == 0)
|
||
return TARGET_XFER_EOF;
|
||
if (!bfd_get_section_contents (core_bfd, section, readbuf,
|
||
(file_ptr) offset, size))
|
||
{
|
||
warning (_("Couldn't read StackGhost cookie in core file."));
|
||
return TARGET_XFER_E_IO;
|
||
}
|
||
|
||
*xfered_len = (ULONGEST) size;
|
||
return TARGET_XFER_OK;
|
||
|
||
}
|
||
return TARGET_XFER_E_IO;
|
||
|
||
case TARGET_OBJECT_LIBRARIES:
|
||
if (core_gdbarch
|
||
&& gdbarch_core_xfer_shared_libraries_p (core_gdbarch))
|
||
{
|
||
if (writebuf)
|
||
return TARGET_XFER_E_IO;
|
||
else
|
||
{
|
||
*xfered_len = gdbarch_core_xfer_shared_libraries (core_gdbarch,
|
||
readbuf,
|
||
offset, len);
|
||
|
||
if (*xfered_len == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
/* FALL THROUGH */
|
||
|
||
case TARGET_OBJECT_LIBRARIES_AIX:
|
||
if (core_gdbarch
|
||
&& gdbarch_core_xfer_shared_libraries_aix_p (core_gdbarch))
|
||
{
|
||
if (writebuf)
|
||
return TARGET_XFER_E_IO;
|
||
else
|
||
{
|
||
*xfered_len
|
||
= gdbarch_core_xfer_shared_libraries_aix (core_gdbarch,
|
||
readbuf, offset,
|
||
len);
|
||
|
||
if (*xfered_len == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
/* FALL THROUGH */
|
||
|
||
case TARGET_OBJECT_SPU:
|
||
if (readbuf && annex)
|
||
{
|
||
/* When the SPU contexts are stored in a core file, BFD
|
||
represents this with a fake section called
|
||
"SPU/<annex>". */
|
||
|
||
struct bfd_section *section;
|
||
bfd_size_type size;
|
||
char sectionstr[100];
|
||
|
||
xsnprintf (sectionstr, sizeof sectionstr, "SPU/%s", annex);
|
||
|
||
section = bfd_get_section_by_name (core_bfd, sectionstr);
|
||
if (section == NULL)
|
||
return TARGET_XFER_E_IO;
|
||
|
||
size = bfd_section_size (core_bfd, section);
|
||
if (offset >= size)
|
||
return TARGET_XFER_EOF;
|
||
size -= offset;
|
||
if (size > len)
|
||
size = len;
|
||
|
||
if (size == 0)
|
||
return TARGET_XFER_EOF;
|
||
if (!bfd_get_section_contents (core_bfd, section, readbuf,
|
||
(file_ptr) offset, size))
|
||
{
|
||
warning (_("Couldn't read SPU section in core file."));
|
||
return TARGET_XFER_E_IO;
|
||
}
|
||
|
||
*xfered_len = (ULONGEST) size;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
else if (readbuf)
|
||
{
|
||
/* NULL annex requests list of all present spuids. */
|
||
struct spuid_list list;
|
||
|
||
list.buf = readbuf;
|
||
list.offset = offset;
|
||
list.len = len;
|
||
list.pos = 0;
|
||
list.written = 0;
|
||
bfd_map_over_sections (core_bfd, add_to_spuid_list, &list);
|
||
|
||
if (list.written == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
{
|
||
*xfered_len = (ULONGEST) list.written;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
return TARGET_XFER_E_IO;
|
||
|
||
case TARGET_OBJECT_SIGNAL_INFO:
|
||
if (readbuf)
|
||
{
|
||
if (core_gdbarch
|
||
&& gdbarch_core_xfer_siginfo_p (core_gdbarch))
|
||
{
|
||
LONGEST l = gdbarch_core_xfer_siginfo (core_gdbarch, readbuf,
|
||
offset, len);
|
||
|
||
if (l >= 0)
|
||
{
|
||
*xfered_len = l;
|
||
if (l == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
}
|
||
return TARGET_XFER_E_IO;
|
||
|
||
default:
|
||
return ops->beneath->to_xfer_partial (ops->beneath, object,
|
||
annex, readbuf,
|
||
writebuf, offset, len,
|
||
xfered_len);
|
||
}
|
||
}
|
||
|
||
|
||
/* 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 (struct target_ops *ops, struct gdbarch *gdbarch,
|
||
struct bp_target_info *bp_tgt)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* Implement the to_remove_breakpoint method. */
|
||
|
||
static int
|
||
core_remove_breakpoint (struct target_ops *ops, struct gdbarch *gdbarch,
|
||
struct bp_target_info *bp_tgt,
|
||
enum remove_bp_reason reason)
|
||
{
|
||
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_thread_alive (struct target_ops *ops, ptid_t ptid)
|
||
{
|
||
return 1;
|
||
}
|
||
|
||
/* Ask the current architecture what it knows about this core file.
|
||
That will be used, in turn, to pick a better architecture. This
|
||
wrapper could be avoided if targets got a chance to specialize
|
||
core_ops. */
|
||
|
||
static const struct target_desc *
|
||
core_read_description (struct target_ops *target)
|
||
{
|
||
if (core_gdbarch && gdbarch_core_read_description_p (core_gdbarch))
|
||
{
|
||
const struct target_desc *result;
|
||
|
||
result = gdbarch_core_read_description (core_gdbarch,
|
||
target, core_bfd);
|
||
if (result != NULL)
|
||
return result;
|
||
}
|
||
|
||
return target->beneath->to_read_description (target->beneath);
|
||
}
|
||
|
||
static const char *
|
||
core_pid_to_str (struct target_ops *ops, ptid_t ptid)
|
||
{
|
||
static char buf[64];
|
||
struct inferior *inf;
|
||
int pid;
|
||
|
||
/* The preferred way is to have a gdbarch/OS specific
|
||
implementation. */
|
||
if (core_gdbarch
|
||
&& gdbarch_core_pid_to_str_p (core_gdbarch))
|
||
return gdbarch_core_pid_to_str (core_gdbarch, ptid);
|
||
|
||
/* Otherwise, if we don't have one, we'll just fallback to
|
||
"process", with normal_pid_to_str. */
|
||
|
||
/* Try the LWPID field first. */
|
||
pid = ptid_get_lwp (ptid);
|
||
if (pid != 0)
|
||
return normal_pid_to_str (pid_to_ptid (pid));
|
||
|
||
/* Otherwise, this isn't a "threaded" core -- use the PID field, but
|
||
only if it isn't a fake PID. */
|
||
inf = find_inferior_ptid (ptid);
|
||
if (inf != NULL && !inf->fake_pid_p)
|
||
return normal_pid_to_str (ptid);
|
||
|
||
/* No luck. We simply don't have a valid PID to print. */
|
||
xsnprintf (buf, sizeof buf, "<main task>");
|
||
return buf;
|
||
}
|
||
|
||
static const char *
|
||
core_thread_name (struct target_ops *self, struct thread_info *thr)
|
||
{
|
||
if (core_gdbarch
|
||
&& gdbarch_core_thread_name_p (core_gdbarch))
|
||
return gdbarch_core_thread_name (core_gdbarch, thr);
|
||
return NULL;
|
||
}
|
||
|
||
static int
|
||
core_has_memory (struct target_ops *ops)
|
||
{
|
||
return (core_bfd != NULL);
|
||
}
|
||
|
||
static int
|
||
core_has_stack (struct target_ops *ops)
|
||
{
|
||
return (core_bfd != NULL);
|
||
}
|
||
|
||
static int
|
||
core_has_registers (struct target_ops *ops)
|
||
{
|
||
return (core_bfd != NULL);
|
||
}
|
||
|
||
/* Implement the to_info_proc method. */
|
||
|
||
static void
|
||
core_info_proc (struct target_ops *ops, const char *args,
|
||
enum info_proc_what request)
|
||
{
|
||
struct gdbarch *gdbarch = get_current_arch ();
|
||
|
||
/* Since this is the core file target, call the 'core_info_proc'
|
||
method on gdbarch, not 'info_proc'. */
|
||
if (gdbarch_core_info_proc_p (gdbarch))
|
||
gdbarch_core_info_proc (gdbarch, args, request);
|
||
}
|
||
|
||
/* 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_detach = core_detach;
|
||
core_ops.to_fetch_registers = get_core_registers;
|
||
core_ops.to_xfer_partial = core_xfer_partial;
|
||
core_ops.to_files_info = core_files_info;
|
||
core_ops.to_insert_breakpoint = ignore;
|
||
core_ops.to_remove_breakpoint = core_remove_breakpoint;
|
||
core_ops.to_thread_alive = core_thread_alive;
|
||
core_ops.to_read_description = core_read_description;
|
||
core_ops.to_pid_to_str = core_pid_to_str;
|
||
core_ops.to_thread_name = core_thread_name;
|
||
core_ops.to_stratum = process_stratum;
|
||
core_ops.to_has_memory = core_has_memory;
|
||
core_ops.to_has_stack = core_has_stack;
|
||
core_ops.to_has_registers = core_has_registers;
|
||
core_ops.to_info_proc = core_info_proc;
|
||
core_ops.to_magic = OPS_MAGIC;
|
||
|
||
if (core_target)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("init_core_ops: core target already exists (\"%s\")."),
|
||
core_target->to_longname);
|
||
core_target = &core_ops;
|
||
}
|
||
|
||
void
|
||
_initialize_corelow (void)
|
||
{
|
||
init_core_ops ();
|
||
|
||
add_target_with_completer (&core_ops, filename_completer);
|
||
}
|