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- /* Core dump and executable file functions below target vector, for GDB.
- Copyright 1986, 1987, 1989, 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "defs.h"
- #include <errno.h>
- #include <signal.h>
- #include <fcntl.h>
- #include "frame.h" /* required by inferior.h */
- #include "inferior.h"
- #include "symtab.h"
- #include "command.h"
- #include "bfd.h"
- #include "target.h"
- #include "gdbcore.h"
-
- static void
- core_files_info PARAMS ((struct target_ops *));
-
- #ifdef SOLIB_ADD
- static int
- solib_add_stub PARAMS ((char *));
- #endif
-
- static void
- core_close PARAMS ((int));
-
- static void
- get_core_registers PARAMS ((int));
-
- /* Discard all vestiges of any previous core file
- and mark data and stack spaces as empty. */
-
- /* ARGSUSED */
- static void
- core_close (quitting)
- int quitting;
- {
- if (core_bfd) {
- free (bfd_get_filename (core_bfd));
- bfd_close (core_bfd);
- core_bfd = NULL;
- #ifdef CLEAR_SOLIB
- CLEAR_SOLIB ();
- #endif
- if (core_ops.to_sections) {
- free ((PTR)core_ops.to_sections);
- core_ops.to_sections = NULL;
- core_ops.to_sections_end = NULL;
- }
- }
- }
-
- #ifdef SOLIB_ADD
- /* Stub function for catch_errors around shared library hacking. */
-
- static int
- solib_add_stub (from_tty)
- char *from_tty;
- {
- SOLIB_ADD (NULL, (int)from_tty, &core_ops);
- return 0;
- }
- #endif /* SOLIB_ADD */
-
- /* This routine opens and sets up the core file bfd */
-
- void
- core_open (filename, from_tty)
- char *filename;
- int from_tty;
- {
- const char *p;
- int siggy;
- struct cleanup *old_chain;
- char *temp;
- bfd *temp_bfd;
- int ontop;
- int scratch_chan;
-
- 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.");
- }
-
- filename = tilde_expand (filename);
- if (filename[0] != '/') {
- temp = concat (current_directory, "/", filename, NULL);
- free (filename);
- filename = temp;
- }
-
- old_chain = make_cleanup (free, filename);
-
- scratch_chan = open (filename, write_files? O_RDWR: O_RDONLY, 0);
- if (scratch_chan < 0)
- perror_with_name (filename);
-
- temp_bfd = bfd_fdopenr (filename, NULL, scratch_chan);
- if (temp_bfd == NULL)
- {
- perror_with_name (filename);
- }
-
- if (!bfd_check_format (temp_bfd, bfd_core))
- {
- /* Do it after the err msg */
- make_cleanup (bfd_close, temp_bfd);
- error ("\"%s\" is not a core dump: %s", filename, bfd_errmsg(bfd_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, core_bfd);
-
- validate_files ();
-
- /* Find the data section */
- if (build_section_table (core_bfd, &core_ops.to_sections,
- &core_ops.to_sections_end))
- error ("Can't find sections in `%s': %s", bfd_get_filename(core_bfd),
- bfd_errmsg (bfd_error));
-
- 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)
- printf_filtered ("Program terminated with signal %d, %s.\n", siggy,
- safe_strsignal (siggy));
-
- 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, (char *)from_tty, (char *)0);
- #endif
-
- /* Now, set up the frame cache, and print the top of stack */
- set_current_frame (create_new_frame (read_register (FP_REGNUM),
- read_pc ()));
- select_frame (get_current_frame (), 0);
- print_stack_frame (selected_frame, selected_frame_level, 1);
- } else {
- warning (
- "you won't be able to access this core file until you terminate\n\
- your %s; do ``info files''", current_target->to_longname);
- }
- }
-
- void
- core_detach (args, from_tty)
- char *args;
- int from_tty;
- {
- if (args)
- error ("Too many arguments");
- unpush_target (&core_ops);
- if (from_tty)
- printf_filtered ("No core file now.\n");
- }
-
- /* 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. */
- /* ARGSUSED */
- static void
- get_core_registers (regno)
- int regno;
- {
- sec_ptr reg_sec;
- unsigned size;
- char *the_regs;
-
- reg_sec = bfd_get_section_by_name (core_bfd, ".reg");
- if (!reg_sec) goto cant;
- size = bfd_section_size (core_bfd, reg_sec);
- the_regs = alloca (size);
- if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size))
- {
- fetch_core_registers (the_regs, size, 0,
- (unsigned) bfd_section_vma (abfd,reg_sec));
- }
- else
- {
- cant:
- fprintf_filtered (stderr, "Couldn't fetch registers from core file: %s\n",
- bfd_errmsg (bfd_error));
- }
-
- /* Now do it again for the float registers, if they exist. */
- reg_sec = bfd_get_section_by_name (core_bfd, ".reg2");
- if (reg_sec) {
- size = bfd_section_size (core_bfd, reg_sec);
- the_regs = alloca (size);
- if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0,
- size))
- {
- fetch_core_registers (the_regs, size, 2,
- (unsigned) bfd_section_vma (abfd,reg_sec));
- }
- else
- {
- fprintf_filtered (stderr, "Couldn't fetch register set 2 from core file: %s\n",
- bfd_errmsg (bfd_error));
- }
- }
- registers_fetched();
- }
-
- static void
- core_files_info (t)
- struct target_ops *t;
- {
- print_section_info (t, core_bfd);
- }
-
- struct target_ops core_ops = {
- "core", "Local core dump file",
- "Use a core file as a target. Specify the filename of the core file.",
- core_open, core_close,
- find_default_attach, core_detach, 0, 0, /* resume, wait */
- get_core_registers,
- 0, 0, /* store_regs, prepare_to_store */
- xfer_memory, core_files_info,
- 0, 0, /* core_insert_breakpoint, core_remove_breakpoint, */
- 0, 0, 0, 0, 0, /* terminal stuff */
- 0, 0, 0, /* kill, load, lookup sym */
- find_default_create_inferior, 0, /* mourn_inferior */
- 0, /* can_run */
- 0, /* notice_signals */
- core_stratum, 0, /* next */
- 0, 1, 1, 1, 0, /* all mem, mem, stack, regs, exec */
- 0, 0, /* section pointers */
- OPS_MAGIC, /* Always the last thing */
- };
-
- void
- _initialize_corelow()
- {
- add_target (&core_ops);
- }
-