0e24ac5d5f
"gdb_assert.h". (core_gdbarch): New variable. (sniff_core_bfd): Don't sniff if we have support for register sets in CORE_GDBARCH. (core_close): Reset CORE_GDBARCH. (core_open): Initialize CORE_GDBARCH. (get_core_register_section): Use register sets if they are supported by CORE_GDBARCH. (get_core_registers): Don't print error message if we have support for register sets in CORE_GDBARCH.
582 lines
16 KiB
C
582 lines
16 KiB
C
/* Core dump and executable file functions below target vector, for GDB.
|
||
|
||
Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996,
|
||
1997, 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "arch-utils.h"
|
||
#include "gdb_string.h"
|
||
#include <errno.h>
|
||
#include <signal.h>
|
||
#include <fcntl.h>
|
||
#ifdef HAVE_SYS_FILE_H
|
||
#include <sys/file.h> /* needed for F_OK and friends */
|
||
#endif
|
||
#include "frame.h" /* required by inferior.h */
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||
#include "inferior.h"
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||
#include "symtab.h"
|
||
#include "command.h"
|
||
#include "bfd.h"
|
||
#include "target.h"
|
||
#include "gdbcore.h"
|
||
#include "gdbthread.h"
|
||
#include "regcache.h"
|
||
#include "regset.h"
|
||
#include "symfile.h"
|
||
#include "exec.h"
|
||
#include <readline/readline.h>
|
||
|
||
#include "gdb_assert.h"
|
||
|
||
#ifndef O_BINARY
|
||
#define O_BINARY 0
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||
#endif
|
||
|
||
/* List of all available core_fns. On gdb startup, each core file register
|
||
reader calls add_core_fns() to register information on each core format it
|
||
is prepared to read. */
|
||
|
||
static struct core_fns *core_file_fns = NULL;
|
||
|
||
/* The core_fns for a core file handler that is prepared to read the core
|
||
file currently open on core_bfd. */
|
||
|
||
static struct core_fns *core_vec = NULL;
|
||
|
||
/* FIXME: kettenis/20031023: Eventually this variable should
|
||
disappear. */
|
||
|
||
struct gdbarch *core_gdbarch = NULL;
|
||
|
||
static void core_files_info (struct target_ops *);
|
||
|
||
#ifdef SOLIB_ADD
|
||
static int solib_add_stub (void *);
|
||
#endif
|
||
|
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static struct core_fns *sniff_core_bfd (bfd *);
|
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|
||
static int gdb_check_format (bfd *);
|
||
|
||
static void core_open (char *, int);
|
||
|
||
static void core_detach (char *, int);
|
||
|
||
static void core_close (int);
|
||
|
||
static void core_close_cleanup (void *ignore);
|
||
|
||
static void get_core_registers (int);
|
||
|
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static void add_to_thread_list (bfd *, asection *, void *);
|
||
|
||
static int ignore (CORE_ADDR, char *);
|
||
|
||
static int core_file_thread_alive (ptid_t tid);
|
||
|
||
static void init_core_ops (void);
|
||
|
||
void _initialize_corelow (void);
|
||
|
||
struct target_ops core_ops;
|
||
|
||
/* 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
|
||
register information about each format the the reader is prepared to
|
||
handle. */
|
||
|
||
void
|
||
add_core_fns (struct core_fns *cf)
|
||
{
|
||
cf->next = core_file_fns;
|
||
core_file_fns = cf;
|
||
}
|
||
|
||
/* The default function that core file handlers can use to examine a
|
||
core file BFD and decide whether or not to accept the job of
|
||
reading the core file. */
|
||
|
||
int
|
||
default_core_sniffer (struct core_fns *our_fns, bfd *abfd)
|
||
{
|
||
int result;
|
||
|
||
result = (bfd_get_flavour (abfd) == our_fns -> core_flavour);
|
||
return (result);
|
||
}
|
||
|
||
/* Walk through the list of core functions to find a set that can
|
||
handle the core file open on ABFD. Default to the first one in the
|
||
list if nothing matches. Returns pointer to set that is
|
||
selected. */
|
||
|
||
static struct core_fns *
|
||
sniff_core_bfd (bfd *abfd)
|
||
{
|
||
struct core_fns *cf;
|
||
struct core_fns *yummy = NULL;
|
||
int matches = 0;;
|
||
|
||
/* Don't sniff if we have support for register sets in CORE_GDBARCH. */
|
||
if (core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch))
|
||
return NULL;
|
||
|
||
for (cf = core_file_fns; cf != NULL; cf = cf->next)
|
||
{
|
||
if (cf->core_sniffer (cf, abfd))
|
||
{
|
||
yummy = cf;
|
||
matches++;
|
||
}
|
||
}
|
||
if (matches > 1)
|
||
{
|
||
warning ("\"%s\": ambiguous core format, %d handlers match",
|
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bfd_get_filename (abfd), matches);
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||
}
|
||
else if (matches == 0)
|
||
{
|
||
warning ("\"%s\": no core file handler recognizes format, using default",
|
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bfd_get_filename (abfd));
|
||
}
|
||
if (yummy == NULL)
|
||
{
|
||
yummy = core_file_fns;
|
||
}
|
||
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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||
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||
int
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||
default_check_format (bfd *abfd)
|
||
{
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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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||
|
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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)
|
||
{
|
||
if (cf->check_format (abfd))
|
||
{
|
||
return (1);
|
||
}
|
||
}
|
||
return (0);
|
||
}
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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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||
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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||
#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;
|
||
}
|
||
}
|
||
core_vec = NULL;
|
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core_gdbarch = NULL;
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||
}
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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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|
||
#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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||
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||
static int
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||
solib_add_stub (void *from_ttyp)
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||
{
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||
SOLIB_ADD (NULL, *(int *) from_ttyp, ¤t_target, auto_solib_add);
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||
re_enable_breakpoints_in_shlibs ();
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||
return 0;
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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
|
||
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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||
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||
add_thread (pid_to_ptid (thread_id));
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|
||
/* Warning, Will Robinson, looking at BFD private data! */
|
||
|
||
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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||
}
|
||
|
||
/* This routine opens and sets up the core file bfd. */
|
||
|
||
static void
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||
core_open (char *filename, int from_tty)
|
||
{
|
||
const char *p;
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||
int siggy;
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||
struct cleanup *old_chain;
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||
char *temp;
|
||
bfd *temp_bfd;
|
||
int ontop;
|
||
int scratch_chan;
|
||
|
||
target_preopen (from_tty);
|
||
if (!filename)
|
||
{
|
||
error (core_bfd ?
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||
"No core file specified. (Use `detach' to stop debugging a core file.)"
|
||
: "No core file specified.");
|
||
}
|
||
|
||
filename = tilde_expand (filename);
|
||
if (filename[0] != '/')
|
||
{
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||
temp = concat (current_directory, "/", filename, NULL);
|
||
xfree (filename);
|
||
filename = temp;
|
||
}
|
||
|
||
old_chain = make_cleanup (xfree, filename);
|
||
|
||
scratch_chan = open (filename, O_BINARY | ( write_files ? O_RDWR : O_RDONLY ), 0);
|
||
if (scratch_chan < 0)
|
||
perror_with_name (filename);
|
||
|
||
temp_bfd = bfd_fdopenr (filename, gnutarget, scratch_chan);
|
||
if (temp_bfd == NULL)
|
||
perror_with_name (filename);
|
||
|
||
if (!bfd_check_format (temp_bfd, bfd_core) &&
|
||
!gdb_check_format (temp_bfd))
|
||
{
|
||
/* Do it after the err msg */
|
||
/* FIXME: should be checking for errors from bfd_close (for one thing,
|
||
on error it does not free all the storage associated with the
|
||
bfd). */
|
||
make_cleanup_bfd_close (temp_bfd);
|
||
error ("\"%s\" is not a core dump: %s",
|
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filename, bfd_errmsg (bfd_get_error ()));
|
||
}
|
||
|
||
/* Looks semi-reasonable. Toss the old core file and work on the new. */
|
||
|
||
discard_cleanups (old_chain); /* Don't free filename any more */
|
||
unpush_target (&core_ops);
|
||
core_bfd = temp_bfd;
|
||
old_chain = make_cleanup (core_close_cleanup, 0 /*ignore*/);
|
||
|
||
/* FIXME: kettenis/20031023: This is very dangerous. The
|
||
CORE_GDBARCH that results from this call may very well be
|
||
different from CURRENT_GDBARCH. However, its methods may only
|
||
work if it is selected as the current architecture, because they
|
||
rely on swapped data (see gdbarch.c). We should get rid of that
|
||
swapped data. */
|
||
core_gdbarch = gdbarch_from_bfd (core_bfd);
|
||
|
||
/* Find a suitable core file handler to munch on core_bfd */
|
||
core_vec = sniff_core_bfd (core_bfd);
|
||
|
||
validate_files ();
|
||
|
||
/* Find the data section */
|
||
if (build_section_table (core_bfd, &core_ops.to_sections,
|
||
&core_ops.to_sections_end))
|
||
error ("\"%s\": Can't find sections: %s",
|
||
bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ()));
|
||
|
||
/* If we have no exec file, try to set the architecture from the
|
||
core file. We don't do this unconditionally since an exec file
|
||
typically contains more information that helps us determine the
|
||
architecture than a core file. */
|
||
if (!exec_bfd)
|
||
set_gdbarch_from_file (core_bfd);
|
||
|
||
ontop = !push_target (&core_ops);
|
||
discard_cleanups (old_chain);
|
||
|
||
p = bfd_core_file_failing_command (core_bfd);
|
||
if (p)
|
||
printf_filtered ("Core was generated by `%s'.\n", p);
|
||
|
||
siggy = bfd_core_file_failing_signal (core_bfd);
|
||
if (siggy > 0)
|
||
/* NOTE: target_signal_from_host() converts a target signal value
|
||
into gdb's internal signal value. Unfortunately gdb's internal
|
||
value is called ``target_signal'' and this function got the
|
||
name ..._from_host(). */
|
||
printf_filtered ("Program terminated with signal %d, %s.\n", siggy,
|
||
target_signal_to_string (target_signal_from_host (siggy)));
|
||
|
||
/* Build up thread list from BFD sections. */
|
||
|
||
init_thread_list ();
|
||
bfd_map_over_sections (core_bfd, add_to_thread_list,
|
||
bfd_get_section_by_name (core_bfd, ".reg"));
|
||
|
||
if (ontop)
|
||
{
|
||
/* Fetch all registers from core file. */
|
||
target_fetch_registers (-1);
|
||
|
||
/* Add symbols and section mappings for any shared libraries. */
|
||
#ifdef SOLIB_ADD
|
||
catch_errors (solib_add_stub, &from_tty, (char *) 0,
|
||
RETURN_MASK_ALL);
|
||
#endif
|
||
|
||
/* Now, set up the frame cache, and print the top of stack. */
|
||
flush_cached_frames ();
|
||
select_frame (get_current_frame ());
|
||
print_stack_frame (deprecated_selected_frame,
|
||
frame_relative_level (deprecated_selected_frame), 1);
|
||
}
|
||
else
|
||
{
|
||
warning (
|
||
"you won't be able to access this core file until you terminate\n\
|
||
your %s; do ``info files''", target_longname);
|
||
}
|
||
}
|
||
|
||
static void
|
||
core_detach (char *args, int from_tty)
|
||
{
|
||
if (args)
|
||
error ("Too many arguments");
|
||
unpush_target (&core_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.
|
||
|
||
If inferior_ptid is zero, do the single-threaded thing: look for a
|
||
section named NAME. If inferior_ptid is non-zero, do the
|
||
multi-threaded thing: look for a section named "NAME/PID", where
|
||
PID is the shortest ASCII decimal representation of inferior_ptid.
|
||
|
||
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 (char *name,
|
||
int which,
|
||
char *human_name,
|
||
int required)
|
||
{
|
||
char section_name[100];
|
||
sec_ptr section;
|
||
bfd_size_type size;
|
||
char *contents;
|
||
|
||
if (PIDGET (inferior_ptid))
|
||
sprintf (section_name, "%s/%d", name, PIDGET (inferior_ptid));
|
||
else
|
||
strcpy (section_name, name);
|
||
|
||
section = bfd_get_section_by_name (core_bfd, section_name);
|
||
if (! section)
|
||
{
|
||
if (required)
|
||
warning ("Couldn't find %s registers in core file.\n", human_name);
|
||
return;
|
||
}
|
||
|
||
size = bfd_section_size (core_bfd, section);
|
||
contents = 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.\n",
|
||
human_name, name);
|
||
return;
|
||
}
|
||
|
||
if (core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch))
|
||
{
|
||
const struct regset *regset;
|
||
|
||
regset = gdbarch_regset_from_core_section (core_gdbarch, name, size);
|
||
if (regset == NULL)
|
||
{
|
||
if (required)
|
||
warning ("Couldn't recognize %s registers in core file.\n",
|
||
human_name);
|
||
return;
|
||
}
|
||
|
||
regset->supply_regset (regset, current_regcache, -1, contents, size);
|
||
return;
|
||
}
|
||
|
||
gdb_assert (core_vec);
|
||
core_vec->core_read_registers (contents, size, which,
|
||
((CORE_ADDR)
|
||
bfd_section_vma (core_bfd, section)));
|
||
}
|
||
|
||
|
||
/* 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 (int regno)
|
||
{
|
||
int status;
|
||
|
||
if (!(core_gdbarch && gdbarch_regset_from_core_section_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;
|
||
}
|
||
|
||
get_core_register_section (".reg", 0, "general-purpose", 1);
|
||
get_core_register_section (".reg2", 2, "floating-point", 0);
|
||
get_core_register_section (".reg-xfp", 3, "extended floating-point", 0);
|
||
|
||
deprecated_registers_fetched ();
|
||
}
|
||
|
||
static void
|
||
core_files_info (struct target_ops *t)
|
||
{
|
||
print_section_info (t, core_bfd);
|
||
}
|
||
|
||
/* 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, char *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_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);
|
||
}
|