| /* Core dump and executable file functions below target vector, for GDB. |
| Copyright 1986, 87, 89, 91, 92, 93, 94, 95, 96, 97, 1998 |
| 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 "gdb_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 "gdbthread.h" |
| |
| /* 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; |
| |
| static void core_files_info PARAMS ((struct target_ops *)); |
| |
| #ifdef SOLIB_ADD |
| 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 void core_close PARAMS ((int)); |
| |
| static void get_core_registers PARAMS ((int)); |
| |
| static void add_to_thread_list PARAMS ((bfd *, asection *, PTR)); |
| |
| 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 |
| handle. */ |
| |
| void |
| add_core_fns (cf) |
| 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 (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. */ |
| |
| /* ARGSUSED */ |
| static void |
| core_close (quitting) |
| int quitting; |
| { |
| char *name; |
| |
| if (core_bfd) |
| { |
| 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; |
| if (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 |
| solib_add_stub (from_ttyp) |
| PTR from_ttyp; |
| { |
| SOLIB_ADD (NULL, *(int *) from_ttyp, ¤t_target); |
| re_enable_breakpoints_in_shlibs (); |
| 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 (reg_sect != NULL |
| && 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) && |
| !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 ((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 */ |
| unpush_target (&core_ops); |
| core_bfd = temp_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 (); |
| |
| /* 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); |
| #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[30]; |
| |
| if (core_vec == NULL) |
| { |
| fprintf_filtered (gdb_stderr, |
| "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'. */ |
| |
| /* 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) && |
| core_vec->core_read_registers != NULL) |
| { |
| (core_vec->core_read_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) && |
| core_vec->core_read_registers != NULL) |
| { |
| (core_vec->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 ())); |
| } |
| } |
| registers_fetched (); |
| } |
| |
| 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] != '/') |
| { |
| temp = concat (current_directory, "/", core, NULL); |
| core = temp; |
| } |
| |
| 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)) |
| { |
| /* 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 ())); |
| } |
| |
| /* 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; |
| { |
| 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; |
| } |
| |
| |
| /* 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 () |
| { |
| init_core_ops (); |
| |
| if (!coreops_suppress_target) |
| add_target (&core_ops); |
| } |