| /* Core dump and executable file functions below target vector, for GDB. |
| |
| Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
| 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008 |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #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 */ |
| #include "inferior.h" |
| #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" |
| #include "exceptions.h" |
| #include "solib.h" |
| #include "filenames.h" |
| |
| |
| #ifndef O_LARGEFILE |
| #define O_LARGEFILE 0 |
| #endif |
| |
| /* List of all available core_fns. On gdb startup, each core file |
| register reader calls deprecated_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 *); |
| |
| static struct core_fns *sniff_core_bfd (bfd *); |
| |
| static int gdb_check_format (bfd *); |
| |
| static void core_open (char *, int); |
| |
| static void core_detach (struct target_ops *ops, char *, int); |
| |
| static void core_close (int); |
| |
| static void core_close_cleanup (void *ignore); |
| |
| static void get_core_registers (struct regcache *, int); |
| |
| static void add_to_thread_list (bfd *, asection *, void *); |
| |
| static int core_file_thread_alive (ptid_t tid); |
| |
| static void init_core_ops (void); |
| |
| void _initialize_corelow (void); |
| |
| struct target_ops core_ops; |
| |
| /* An arbitrary identifier for the core inferior. */ |
| #define CORELOW_PID 1 |
| |
| /* 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 |
| deprecated_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"), |
| 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 (bfd *abfd) |
| { |
| return (0); |
| } |
| |
| /* Attempt to recognize core file formats that BFD rejects. */ |
| |
| static int |
| gdb_check_format (bfd *abfd) |
| { |
| struct core_fns *cf; |
| |
| for (cf = core_file_fns; cf != NULL; cf = cf->next) |
| { |
| if (cf->check_format (abfd)) |
| { |
| return (1); |
| } |
| } |
| return (0); |
| } |
| |
| /* Discard all vestiges of any previous core file and mark data and stack |
| spaces as empty. */ |
| |
| static void |
| core_close (int quitting) |
| { |
| char *name; |
| |
| if (core_bfd) |
| { |
| inferior_ptid = null_ptid; /* Avoid confusion from thread stuff */ |
| delete_inferior_silent (CORELOW_PID); |
| |
| /* Clear out solib state while the bfd is still open. See |
| comments in clear_solib in solib.c. */ |
| clear_solib (); |
| |
| name = bfd_get_filename (core_bfd); |
| if (!bfd_close (core_bfd)) |
| warning (_("cannot close \"%s\": %s"), |
| name, bfd_errmsg (bfd_get_error ())); |
| xfree (name); |
| core_bfd = NULL; |
| if (core_ops.to_sections) |
| { |
| xfree (core_ops.to_sections); |
| core_ops.to_sections = NULL; |
| core_ops.to_sections_end = NULL; |
| } |
| } |
| core_vec = NULL; |
| core_gdbarch = NULL; |
| } |
| |
| static void |
| core_close_cleanup (void *ignore) |
| { |
| core_close (0/*ignored*/); |
| } |
| |
| /* 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 (bfd *abfd, asection *asect, void *reg_sect_arg) |
| { |
| ptid_t ptid; |
| 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); |
| |
| ptid = ptid_build (ptid_get_pid (inferior_ptid), thread_id, 0); |
| |
| if (ptid_get_lwp (inferior_ptid) == 0) |
| /* The main thread has already been added before getting here, and |
| this is the first time we hear about a thread id. Assume this |
| is the main thread. */ |
| thread_change_ptid (inferior_ptid, ptid); |
| else |
| /* Nope, really a new thread. */ |
| add_thread (ptid); |
| |
| /* Warning, Will Robinson, looking at BFD private data! */ |
| |
| if (reg_sect != NULL |
| && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ |
| inferior_ptid = ptid; /* Yes, make it current */ |
| } |
| |
| /* This routine opens and sets up the core file bfd. */ |
| |
| static void |
| core_open (char *filename, int from_tty) |
| { |
| const char *p; |
| int siggy; |
| struct cleanup *old_chain; |
| char *temp; |
| bfd *temp_bfd; |
| int scratch_chan; |
| int flags; |
| int corelow_pid = CORELOW_PID; |
| |
| target_preopen (from_tty); |
| if (!filename) |
| { |
| if (core_bfd) |
| error (_("No core file specified. (Use `detach' to stop debugging a core file.)")); |
| else |
| error (_("No core file specified.")); |
| } |
| |
| filename = tilde_expand (filename); |
| if (!IS_ABSOLUTE_PATH(filename)) |
| { |
| temp = concat (current_directory, "/", filename, (char *)NULL); |
| xfree (filename); |
| filename = temp; |
| } |
| |
| old_chain = make_cleanup (xfree, filename); |
| |
| flags = O_BINARY | O_LARGEFILE; |
| if (write_files) |
| flags |= O_RDWR; |
| else |
| flags |= O_RDONLY; |
| scratch_chan = open (filename, flags, 0); |
| if (scratch_chan < 0) |
| perror_with_name (filename); |
| |
| temp_bfd = bfd_fopen (filename, gnutarget, |
| write_files ? FOPEN_RUB : FOPEN_RB, |
| 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"), |
| 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); |
| |
| push_target (&core_ops); |
| discard_cleanups (old_chain); |
| |
| add_inferior_silent (corelow_pid); |
| |
| /* Do this before acknowledging the inferior, so if |
| post_create_inferior throws (can happen easilly if you're loading |
| a core file with the wrong exec), we aren't left with threads |
| from the previous inferior. */ |
| init_thread_list (); |
| |
| /* Set INFERIOR_PTID early, so an upper layer can rely on it being |
| set while in the target_find_new_threads call below. */ |
| inferior_ptid = pid_to_ptid (corelow_pid); |
| |
| /* Assume ST --- Add a main task. We'll later detect when we go |
| from ST to MT. */ |
| add_thread_silent (inferior_ptid); |
| |
| /* This is done first, before anything has a chance to query the |
| inferior for information such as symbols. */ |
| post_create_inferior (&core_ops, from_tty); |
| |
| /* Build up thread list from BFD sections, and possibly set the |
| current thread to the .reg/NN section matching the .reg |
| section. */ |
| bfd_map_over_sections (core_bfd, add_to_thread_list, |
| bfd_get_section_by_name (core_bfd, ".reg")); |
| |
| /* Now go through the target stack looking for threads since there |
| may be a thread_stratum target loaded on top of target core by |
| now. The layer above should claim threads found in the BFD |
| sections. */ |
| target_find_new_threads (); |
| |
| 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 ( |
| gdbarch_target_signal_from_host (core_gdbarch, siggy))); |
| |
| /* Fetch all registers from core file. */ |
| target_fetch_registers (get_current_regcache (), -1); |
| |
| /* Now, set up the frame cache, and print the top of stack. */ |
| reinit_frame_cache (); |
| print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
| } |
| |
| static void |
| core_detach (struct target_ops *ops, char *args, int from_tty) |
| { |
| if (args) |
| error (_("Too many arguments")); |
| unpush_target (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's lwp member is zero, do the single-threaded |
| thing: look for a section named NAME. If inferior_ptid's lwp |
| member is non-zero, do the multi-threaded thing: look for a section |
| named "NAME/LWP", where LWP is the shortest ASCII decimal |
| representation of inferior_ptid's lwp member. |
| |
| 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 (struct regcache *regcache, |
| char *name, |
| int which, |
| char *human_name, |
| int required) |
| { |
| static char *section_name = NULL; |
| struct bfd_section *section; |
| bfd_size_type size; |
| char *contents; |
| |
| xfree (section_name); |
| if (ptid_get_lwp (inferior_ptid)) |
| section_name = xstrprintf ("%s/%ld", name, ptid_get_lwp (inferior_ptid)); |
| else |
| section_name = xstrdup (name); |
| |
| section = bfd_get_section_by_name (core_bfd, section_name); |
| if (! section) |
| { |
| if (required) |
| warning (_("Couldn't find %s registers in core file."), 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."), |
| 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."), |
| human_name); |
| return; |
| } |
| |
| regset->supply_regset (regset, regcache, -1, contents, size); |
| return; |
| } |
| |
| gdb_assert (core_vec); |
| core_vec->core_read_registers (regcache, 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 (struct regcache *regcache, int regno) |
| { |
| int i; |
| |
| 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 (regcache, |
| ".reg", 0, "general-purpose", 1); |
| get_core_register_section (regcache, |
| ".reg2", 2, "floating-point", 0); |
| get_core_register_section (regcache, |
| ".reg-xfp", 3, "extended floating-point", 0); |
| get_core_register_section (regcache, |
| ".reg-ppc-vmx", 3, "ppc Altivec", 0); |
| get_core_register_section (regcache, |
| ".reg-ppc-vsx", 4, "POWER7 VSX", 0); |
| |
| /* Supply dummy value for all registers not found in the core. */ |
| for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
| if (!regcache_valid_p (regcache, i)) |
| regcache_raw_supply (regcache, i, NULL); |
| } |
| |
| static void |
| core_files_info (struct target_ops *t) |
| { |
| print_section_info (t, core_bfd); |
| } |
| |
| static LONGEST |
| core_xfer_partial (struct target_ops *ops, enum target_object object, |
| const char *annex, gdb_byte *readbuf, |
| const gdb_byte *writebuf, ULONGEST offset, LONGEST len) |
| { |
| switch (object) |
| { |
| case TARGET_OBJECT_MEMORY: |
| if (readbuf) |
| return (*ops->deprecated_xfer_memory) (offset, readbuf, |
| len, 0/*read*/, NULL, ops); |
| if (writebuf) |
| return (*ops->deprecated_xfer_memory) (offset, (gdb_byte *) writebuf, |
| len, 1/*write*/, NULL, ops); |
| return -1; |
| |
| case TARGET_OBJECT_AUXV: |
| if (readbuf) |
| { |
| /* When the aux vector is stored in core file, BFD |
| represents this with a fake section called ".auxv". */ |
| |
| struct bfd_section *section; |
| bfd_size_type size; |
| char *contents; |
| |
| section = bfd_get_section_by_name (core_bfd, ".auxv"); |
| if (section == NULL) |
| return -1; |
| |
| size = bfd_section_size (core_bfd, section); |
| if (offset >= size) |
| return 0; |
| size -= offset; |
| if (size > len) |
| size = len; |
| if (size > 0 |
| && !bfd_get_section_contents (core_bfd, section, readbuf, |
| (file_ptr) offset, size)) |
| { |
| warning (_("Couldn't read NT_AUXV note in core file.")); |
| return -1; |
| } |
| |
| return size; |
| } |
| return -1; |
| |
| case TARGET_OBJECT_WCOOKIE: |
| if (readbuf) |
| { |
| /* When the StackGhost cookie is stored in core file, BFD |
| represents this with a fake section called ".wcookie". */ |
| |
| struct bfd_section *section; |
| bfd_size_type size; |
| char *contents; |
| |
| section = bfd_get_section_by_name (core_bfd, ".wcookie"); |
| if (section == NULL) |
| return -1; |
| |
| size = bfd_section_size (core_bfd, section); |
| if (offset >= size) |
| return 0; |
| size -= offset; |
| if (size > len) |
| size = len; |
| if (size > 0 |
| && !bfd_get_section_contents (core_bfd, section, readbuf, |
| (file_ptr) offset, size)) |
| { |
| warning (_("Couldn't read StackGhost cookie in core file.")); |
| return -1; |
| } |
| |
| return size; |
| } |
| return -1; |
| |
| case TARGET_OBJECT_LIBRARIES: |
| if (core_gdbarch |
| && gdbarch_core_xfer_shared_libraries_p (core_gdbarch)) |
| { |
| if (writebuf) |
| return -1; |
| return |
| gdbarch_core_xfer_shared_libraries (core_gdbarch, |
| readbuf, offset, len); |
| } |
| /* FALL THROUGH */ |
| |
| default: |
| if (ops->beneath != NULL) |
| return ops->beneath->to_xfer_partial (ops->beneath, object, annex, |
| readbuf, writebuf, offset, len); |
| return -1; |
| } |
| } |
| |
| |
| /* 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 (struct bp_target_info *bp_tgt) |
| { |
| 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; |
| } |
| |
| /* Ask the current architecture what it knows about this core file. |
| That will be used, in turn, to pick a better architecture. This |
| wrapper could be avoided if targets got a chance to specialize |
| core_ops. */ |
| |
| static const struct target_desc * |
| core_read_description (struct target_ops *target) |
| { |
| if (gdbarch_core_read_description_p (current_gdbarch)) |
| return gdbarch_core_read_description (current_gdbarch, target, core_bfd); |
| |
| return NULL; |
| } |
| |
| static char * |
| core_pid_to_str (ptid_t ptid) |
| { |
| static char buf[64]; |
| |
| if (ptid_get_lwp (ptid) == 0) |
| xsnprintf (buf, sizeof buf, "<main task>"); |
| else |
| xsnprintf (buf, sizeof buf, "Thread %ld", ptid_get_lwp (ptid)); |
| |
| return buf; |
| } |
| |
| /* 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_partial = core_xfer_partial; |
| core_ops.deprecated_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_read_description = core_read_description; |
| core_ops.to_pid_to_str = core_pid_to_str; |
| 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); |
| } |