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- /* Core dump and executable file functions below target vector, for GDB.
- Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995
- 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 <string.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"
- #include "thread.h"
-
- static void core_files_info PARAMS ((struct target_ops *));
-
- #ifdef SOLIB_ADD
- static int solib_add_stub PARAMS ((char *));
- #endif
-
- static void core_open PARAMS ((char *, int));
-
- static void core_detach PARAMS ((char *, int));
-
- 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;
- {
- char *name;
-
- inferior_pid = 0; /* Avoid confusion from thread stuff */
-
- if (core_bfd)
- {
- 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);
- core_ops.to_sections = NULL;
- core_ops.to_sections_end = 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
- solib_add_stub (from_ttyp)
- char *from_ttyp;
- {
- SOLIB_ADD (NULL, *(int *)from_ttyp, ¤t_target);
- return 0;
- }
- #endif /* SOLIB_ADD */
-
- /* Look for sections whose names start with `.reg/' so that we can extract the
- list of threads in a core file. */
-
- static void
- add_to_thread_list (abfd, asect, reg_sect_arg)
- bfd *abfd;
- asection *asect;
- PTR reg_sect_arg;
- {
- int thread_id;
- asection *reg_sect = (asection *) reg_sect_arg;
-
- if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0)
- return;
-
- thread_id = atoi (bfd_section_name (abfd, asect) + 5);
-
- add_thread (thread_id);
-
- /* Warning, Will Robinson, looking at BFD private data! */
-
- if (asect->filepos == reg_sect->filepos) /* Did we find .reg? */
- inferior_pid = thread_id; /* Yes, make it current */
- }
-
- /* This routine opens and sets up the core file bfd. */
-
- static 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, gnutarget, scratch_chan);
- if (temp_bfd == NULL)
- perror_with_name (filename);
-
- if (!bfd_check_format (temp_bfd, bfd_core))
- {
- /* 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",
- 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, 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 ()));
-
- 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));
-
- /* 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);
-
- /* solib_add_stub usually modifies current_target.to_sections, which
- has to be reflected in core_ops to enable proper freeing of
- the to_sections vector in core_close and correct section
- mapping in xfer_memory and core_files_info. */
- core_ops.to_sections = current_target.to_sections;
- core_ops.to_sections_end = current_target.to_sections_end;
- #endif
-
- /* Now, set up the frame cache, and print the top of stack. */
- flush_cached_frames ();
- 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''", target_longname);
- }
- }
-
- static void
- core_detach (args, from_tty)
- 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");
- }
-
- /* 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;
- char secname[10];
-
- /* 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'. */
-
- /* XXX - same thing needs to be done for floating-point (.reg2) sections. */
-
- 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);
- 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 (gdb_stderr,
- "Couldn't fetch registers from core file: %s\n",
- bfd_errmsg (bfd_get_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 (gdb_stderr,
- "Couldn't fetch register set 2 from core file: %s\n",
- bfd_errmsg (bfd_get_error ()));
- }
- }
- registers_fetched ();
- }
-
- static void
- core_files_info (t)
- 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 (addr, contents)
- CORE_ADDR addr;
- char *contents;
- {
- 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_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 */
- };
-
- void
- _initialize_corelow()
- {
- add_target (&core_ops);
- }
-