/* Core dump and executable file functions below target vector, for GDB.
- Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997
+ Copyright 1986, 87, 89, 91, 92, 93, 94, 95, 96, 97, 1998
Free Software Foundation, Inc.
-This file is part of GDB.
+ 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 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.
+ 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. */
+ 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 "gdb_string.h"
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
-#include "frame.h" /* required by inferior.h */
+#include "frame.h" /* required by inferior.h */
#include "inferior.h"
#include "symtab.h"
#include "command.h"
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;
+
static void core_files_info PARAMS ((struct target_ops *));
#ifdef SOLIB_ADD
-static int solib_add_stub PARAMS ((char *));
+static int solib_add_stub PARAMS ((PTR));
#endif
+static struct core_fns *sniff_core_bfd PARAMS ((bfd *));
+
+static boolean gdb_check_format PARAMS ((bfd *));
+
static void core_open PARAMS ((char *, int));
static void core_detach PARAMS ((char *, int));
static int ignore PARAMS ((CORE_ADDR, char *));
+static char *core_file_to_sym_file PARAMS ((char *));
+
+static int core_file_thread_alive PARAMS ((int tid));
+
+static void init_core_ops PARAMS ((void));
+
+void _initialize_corelow PARAMS ((void));
+
+struct target_ops core_ops;
+
/* Link a new core_fns into the global core_file_fns list. Called on gdb
startup by the _initialize routine in each core file register reader, to
register information about each format the the reader is prepared to
add_core_fns (cf)
struct core_fns *cf;
{
- cf -> next = core_file_fns;
+ 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 (our_fns, abfd)
+ 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 of nothing matches. Returns pointer to set that is
+ selected. */
+
+static struct core_fns *
+sniff_core_bfd (abfd)
+ bfd *abfd;
+{
+ struct core_fns *cf;
+ struct core_fns *yummy = NULL;
+ int matches = 0;;
+
+ 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",
+ bfd_get_filename (abfd), matches);
+ }
+ else if (matches == 0)
+ {
+ warning ("\"%s\": no core file handler recognizes format, using default",
+ bfd_get_filename (abfd));
+ }
+ if (yummy == NULL)
+ {
+ yummy = core_file_fns;
+ }
+ return (yummy);
+}
+
+/* The default is to reject every core file format we see. Either
+ BFD has to recognize it, or we have to provide a function in the
+ core file handler that recognizes it. */
+
+int
+default_check_format (abfd)
+ bfd *abfd;
+{
+ return (0);
+}
+
+/* Attempt to recognize core file formats that BFD rejects. */
+
+static boolean
+gdb_check_format (abfd)
+ bfd *abfd;
+{
+ struct core_fns *cf;
+
+ for (cf = core_file_fns; cf != NULL; cf = cf->next)
+ {
+ if (cf->check_format (abfd))
+ {
+ return (true);
+ }
+ }
+ return (false);
+}
/* Discard all vestiges of any previous core file and mark data and stack
spaces as empty. */
{
inferior_pid = 0; /* Avoid confusion from thread stuff */
+ /* Clear out solib state while the bfd is still open. See
+ comments in clear_solib in solib.c. */
+#ifdef CLEAR_SOLIB
+ CLEAR_SOLIB ();
+#endif
+
name = bfd_get_filename (core_bfd);
if (!bfd_close (core_bfd))
warning ("cannot close \"%s\": %s",
name, bfd_errmsg (bfd_get_error ()));
free (name);
core_bfd = NULL;
-#ifdef CLEAR_SOLIB
- CLEAR_SOLIB ();
-#endif
if (core_ops.to_sections)
{
- free ((PTR)core_ops.to_sections);
+ free ((PTR) core_ops.to_sections);
core_ops.to_sections = NULL;
core_ops.to_sections_end = NULL;
}
}
+ core_vec = NULL;
}
#ifdef SOLIB_ADD
/* Stub function for catch_errors around shared library hacking. FROM_TTYP
is really an int * which points to from_tty. */
-static int
+static int
solib_add_stub (from_ttyp)
- char *from_ttyp;
+ PTR from_ttyp;
{
- SOLIB_ADD (NULL, *(int *)from_ttyp, ¤t_target);
+ SOLIB_ADD (NULL, *(int *) from_ttyp, ¤t_target);
re_enable_breakpoints_in_shlibs ();
return 0;
}
/* Warning, Will Robinson, looking at BFD private data! */
if (reg_sect != NULL
- && asect->filepos == reg_sect->filepos) /* Did we find .reg? */
+ && asect->filepos == reg_sect->filepos) /* Did we find .reg? */
inferior_pid = thread_id; /* Yes, make it current */
}
target_preopen (from_tty);
if (!filename)
{
- error (core_bfd ?
- "No core file specified. (Use `detach' to stop debugging a core file.)"
- : "No core file specified.");
+ error (core_bfd ?
+ "No core file specified. (Use `detach' to stop debugging a core file.)"
+ : "No core file specified.");
}
filename = tilde_expand (filename);
if (temp_bfd == NULL)
perror_with_name (filename);
- if (!bfd_check_format (temp_bfd, bfd_core))
+ 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);
+ on error it does not free all the storage associated with the
+ bfd). */
+ make_cleanup ((make_cleanup_func) bfd_close, temp_bfd);
error ("\"%s\" is not a core dump: %s",
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 */
+ discard_cleanups (old_chain); /* Don't free filename any more */
unpush_target (&core_ops);
core_bfd = temp_bfd;
- old_chain = make_cleanup (core_close, core_bfd);
+ old_chain = make_cleanup ((make_cleanup_func) core_close, core_bfd);
+
+ /* Find a suitable core file handler to munch on core_bfd */
+ core_vec = sniff_core_bfd (core_bfd);
validate_files ();
/* Add symbols and section mappings for any shared libraries. */
#ifdef SOLIB_ADD
- catch_errors (solib_add_stub, &from_tty, (char *)0,
+ catch_errors (solib_add_stub, &from_tty, (char *) 0,
RETURN_MASK_ALL);
#endif
else
{
warning (
-"you won't be able to access this core file until you terminate\n\
+ "you won't be able to access this core file until you terminate\n\
your %s; do ``info files''", target_longname);
}
}
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_pid is zero, do the single-threaded thing: look for a
+ section named NAME. If inferior_pid 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_pid.
+
+ 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 (inferior_pid)
+ sprintf (section_name, "%s/%d", name, inferior_pid);
+ 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;
+ }
+
+ 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. */
get_core_registers (regno)
int regno;
{
- sec_ptr reg_sec;
- unsigned size;
- char *the_regs;
- char secname[10];
- enum bfd_flavour our_flavour = bfd_get_flavour (core_bfd);
- struct core_fns *cf = NULL;
-
- if (core_file_fns == NULL)
+ int status;
+
+ if (core_vec == NULL
+ || core_vec->core_read_registers == NULL)
{
fprintf_filtered (gdb_stderr,
- "Can't fetch registers from this type of core file\n");
+ "Can't fetch registers from this type of core file\n");
return;
}
- /* Thread support. If inferior_pid is non-zero, then we have found a core
- file with threads (or multiple processes). In that case, we need to
- use the appropriate register section, else we just use `.reg'. */
+ 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);
- /* XXX - same thing needs to be done for floating-point (.reg2) sections. */
+ registers_fetched ();
+}
- if (inferior_pid)
- sprintf (secname, ".reg/%d", inferior_pid);
- else
- strcpy (secname, ".reg");
-
- reg_sec = bfd_get_section_by_name (core_bfd, secname);
- if (!reg_sec)
- goto cant;
- size = bfd_section_size (core_bfd, reg_sec);
- the_regs = alloca (size);
- /* Look for the core functions that match this flavor. Default to the
- first one if nothing matches. */
- for (cf = core_file_fns; cf != NULL; cf = cf -> next)
- {
- if (our_flavour == cf -> core_flavour)
- {
- break;
- }
- }
- if (cf == NULL)
- {
- cf = core_file_fns;
- }
- if (cf != NULL &&
- bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size) &&
- cf -> core_read_registers != NULL)
- {
- (cf -> core_read_registers (the_regs, size, 0,
- (unsigned) bfd_section_vma (abfd,reg_sec)));
- }
- else
+static char *
+core_file_to_sym_file (core)
+ char *core;
+{
+ CONST char *failing_command;
+ char *p;
+ char *temp;
+ bfd *temp_bfd;
+ int scratch_chan;
+
+ if (!core)
+ error ("No core file specified.");
+
+ core = tilde_expand (core);
+ if (core[0] != '/')
{
-cant:
- fprintf_filtered (gdb_stderr,
- "Couldn't fetch registers from core file: %s\n",
- bfd_errmsg (bfd_get_error ()));
+ temp = concat (current_directory, "/", core, NULL);
+ core = temp;
}
- /* Now do it again for the float registers, if they exist. */
- reg_sec = bfd_get_section_by_name (core_bfd, ".reg2");
- if (reg_sec)
+ scratch_chan = open (core, write_files ? O_RDWR : O_RDONLY, 0);
+ if (scratch_chan < 0)
+ perror_with_name (core);
+
+ temp_bfd = bfd_fdopenr (core, gnutarget, scratch_chan);
+ if (temp_bfd == NULL)
+ perror_with_name (core);
+
+ if (!bfd_check_format (temp_bfd, bfd_core))
{
- size = bfd_section_size (core_bfd, reg_sec);
- the_regs = alloca (size);
- if (cf != NULL &&
- bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size) &&
- cf -> core_read_registers != NULL)
- {
- (cf -> core_read_registers (the_regs, size, 2,
- (unsigned) bfd_section_vma (abfd,reg_sec)));
- }
- else
- {
- fprintf_filtered (gdb_stderr,
- "Couldn't fetch register set 2 from core file: %s\n",
- bfd_errmsg (bfd_get_error ()));
- }
+ /* 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 ((make_cleanup_func) bfd_close, temp_bfd);
+ error ("\"%s\" is not a core dump: %s",
+ core, bfd_errmsg (bfd_get_error ()));
}
- registers_fetched ();
+
+ /* Find the data section */
+ if (build_section_table (temp_bfd, &core_ops.to_sections,
+ &core_ops.to_sections_end))
+ error ("\"%s\": Can't find sections: %s",
+ bfd_get_filename (temp_bfd), bfd_errmsg (bfd_get_error ()));
+
+ failing_command = bfd_core_file_failing_command (temp_bfd);
+
+ bfd_close (temp_bfd);
+
+ /* If we found a filename, remember that it is probably saved
+ relative to the executable that created it. If working directory
+ isn't there now, we may not be able to find the executable. Rather
+ than trying to be sauve about finding it, just check if the file
+ exists where we are now. If not, then punt and tell our client
+ we couldn't find the sym file.
+ */
+ p = (char *) failing_command;
+ if ((p != NULL) && (access (p, F_OK) != 0))
+ p = NULL;
+
+ return p;
}
static void
core_files_info (t)
- struct target_ops *t;
+ struct target_ops *t;
{
print_section_info (t, core_bfd);
}
return 0;
}
-struct target_ops core_ops = {
- "core", /* to_shortname */
- "Local core dump file", /* to_longname */
- "Use a core file as a target. Specify the filename of the core file.", /* to_doc */
- core_open, /* to_open */
- core_close, /* to_close */
- find_default_attach, /* to_attach */
- core_detach, /* to_detach */
- 0, /* to_resume */
- 0, /* to_wait */
- get_core_registers, /* to_fetch_registers */
- 0, /* to_store_registers */
- 0, /* to_prepare_to_store */
- xfer_memory, /* to_xfer_memory */
- core_files_info, /* to_files_info */
- ignore, /* to_insert_breakpoint */
- ignore, /* to_remove_breakpoint */
- 0, /* to_terminal_init */
- 0, /* to_terminal_inferior */
- 0, /* to_terminal_ours_for_output */
- 0, /* to_terminal_ours */
- 0, /* to_terminal_info */
- 0, /* to_kill */
- 0, /* to_load */
- 0, /* to_lookup_symbol */
- find_default_create_inferior, /* to_create_inferior */
- 0, /* to_mourn_inferior */
- 0, /* to_can_run */
- 0, /* to_notice_signals */
- 0, /* to_thread_alive */
- 0, /* to_stop */
- core_stratum, /* to_stratum */
- 0, /* to_next */
- 0, /* to_has_all_memory */
- 1, /* to_has_memory */
- 1, /* to_has_stack */
- 1, /* to_has_registers */
- 0, /* to_has_execution */
- 0, /* to_sections */
- 0, /* to_sections_end */
- OPS_MAGIC, /* to_magic */
-};
+
+/* 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 (tid)
+ int tid;
+{
+ return 1;
+}
+
+/* Fill in core_ops with its defined operations and properties. */
+
+static void
+init_core_ops ()
+{
+ core_ops.to_shortname = "core";
+ core_ops.to_longname = "Local core dump file";
+ core_ops.to_doc =
+ "Use a core file as a target. Specify the filename of the core file.";
+ core_ops.to_open = core_open;
+ core_ops.to_close = core_close;
+ core_ops.to_attach = find_default_attach;
+ core_ops.to_require_attach = find_default_require_attach;
+ core_ops.to_detach = core_detach;
+ core_ops.to_require_detach = find_default_require_detach;
+ core_ops.to_fetch_registers = get_core_registers;
+ core_ops.to_xfer_memory = xfer_memory;
+ core_ops.to_files_info = core_files_info;
+ core_ops.to_insert_breakpoint = ignore;
+ core_ops.to_remove_breakpoint = ignore;
+ core_ops.to_create_inferior = find_default_create_inferior;
+ core_ops.to_clone_and_follow_inferior = find_default_clone_and_follow_inferior;
+ core_ops.to_thread_alive = core_file_thread_alive;
+ core_ops.to_core_file_to_sym_file = core_file_to_sym_file;
+ core_ops.to_stratum = core_stratum;
+ core_ops.to_has_memory = 1;
+ core_ops.to_has_stack = 1;
+ core_ops.to_has_registers = 1;
+ core_ops.to_magic = OPS_MAGIC;
+}
+
+/* non-zero if we should not do the add_target call in
+ _initialize_corelow; not initialized (i.e., bss) so that
+ the target can initialize it (i.e., data) if appropriate.
+ This needs to be set at compile time because we don't know
+ for sure whether the target's initialize routine is called
+ before us or after us. */
+int coreops_suppress_target;
void
-_initialize_corelow()
+_initialize_corelow ()
{
- add_target (&core_ops);
+ init_core_ops ();
+
+ if (!coreops_suppress_target)
+ add_target (&core_ops);
}
projects / deliverable / binutils-gdb.git / blobdiff