X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fcorelow.c;h=5f6e26db3b5ed77b037bc3815830ba1ebf0e7954;hb=c4c5b7baca1810ae720b89e46416b6c24f14c730;hp=9d7c25269b868f0c3531a4883dc332f21f7b5e09;hpb=ba47c66add7b9bd51af6ca2e6f45529bb38b9dd3;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/corelow.c b/gdb/corelow.c index 9d7c25269b..5f6e26db3b 100644 --- a/gdb/corelow.c +++ b/gdb/corelow.c @@ -1,86 +1,247 @@ /* Core dump and executable file functions below target vector, for GDB. - Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994 - Free Software Foundation, Inc. -This file is part of GDB. + Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, + 1997, 1998, 1999, 2000, 2001, 2003, 2004 Free Software Foundation, + Inc. -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 file is part of GDB. -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 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. -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. */ + 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 +#include "arch-utils.h" +#include "gdb_string.h" #include #include #include -#include "frame.h" /* required by inferior.h */ +#ifdef HAVE_SYS_FILE_H +#include /* 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 "thread.h" +#include "gdbthread.h" +#include "regcache.h" +#include "regset.h" +#include "symfile.h" +#include "exec.h" +#include -static void -core_files_info PARAMS ((struct target_ops *)); +#include "gdb_assert.h" + +#ifndef O_BINARY +#define O_BINARY 0 +#endif + +/* 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; + +/* FIXME: kettenis/20031023: Eventually this variable should + disappear. */ + +struct gdbarch *core_gdbarch = NULL; + +static void core_files_info (struct target_ops *); #ifdef SOLIB_ADD -static int -solib_add_stub PARAMS ((char *)); +static int solib_add_stub (void *); #endif -static void -core_close PARAMS ((int)); +static struct core_fns *sniff_core_bfd (bfd *); -static void -get_core_registers PARAMS ((int)); +static int gdb_check_format (bfd *); + +static void core_open (char *, int); + +static void core_detach (char *, int); + +static void core_close (int); -/* Discard all vestiges of any previous core file - and mark data and stack spaces as empty. */ +static void core_close_cleanup (void *ignore); + +static void get_core_registers (int); + +static void add_to_thread_list (bfd *, asection *, void *); + +static int ignore (CORE_ADDR, char *); + +static int core_file_thread_alive (ptid_t tid); + +static void init_core_ops (void); + +void _initialize_corelow (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 (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. */ -/* ARGSUSED */ static void -core_close (quitting) - int quitting; +core_close (int quitting) { - inferior_pid = 0; /* Avoid confusion from thread stuff */ + char *name; + + if (core_bfd) + { + inferior_ptid = null_ptid; /* Avoid confusion from thread stuff */ - if (core_bfd) { - free (bfd_get_filename (core_bfd)); - bfd_close (core_bfd); - core_bfd = NULL; + /* Clear out solib state while the bfd is still open. See + comments in clear_solib in solib.c. */ #ifdef CLEAR_SOLIB - 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; + + 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*/); } #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; +static int +solib_add_stub (void *from_ttyp) { - SOLIB_ADD (NULL, *(int *)from_ttyp, &core_ops); - return 0; + SOLIB_ADD (NULL, *(int *) from_ttyp, ¤t_target, auto_solib_add); + re_enable_breakpoints_in_shlibs (); + return 0; } #endif /* SOLIB_ADD */ @@ -88,10 +249,7 @@ solib_add_stub (from_ttyp) 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; +add_to_thread_list (bfd *abfd, asection *asect, void *reg_sect_arg) { int thread_id; asection *reg_sect = (asection *) reg_sect_arg; @@ -101,20 +259,19 @@ add_to_thread_list (abfd, asect, reg_sect_arg) thread_id = atoi (bfd_section_name (abfd, asect) + 5); - add_thread (thread_id); + add_thread (pid_to_ptid (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 */ + if (reg_sect != NULL + && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ + inferior_ptid = pid_to_ptid (thread_id); /* Yes, make it current */ } -/* This routine opens and sets up the core file bfd */ +/* This routine opens and sets up the core file bfd. */ -void -core_open (filename, from_tty) - char *filename; - int from_tty; +static void +core_open (char *filename, int from_tty) { const char *p; int siggy; @@ -127,51 +284,73 @@ core_open (filename, from_tty) 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 (filename[0] != '/') { - temp = concat (current_directory, "/", filename, NULL); - free (filename); - filename = temp; - } + if (filename[0] != '/') + { + temp = concat (current_directory, "/", filename, NULL); + xfree (filename); + filename = temp; + } - old_chain = make_cleanup (free, filename); + old_chain = make_cleanup (xfree, filename); - scratch_chan = open (filename, write_files? O_RDWR: O_RDONLY, 0); + scratch_chan = open (filename, O_BINARY | ( 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); - } + 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 */ - make_cleanup (bfd_close, temp_bfd); - error ("\"%s\" is not a core dump: %s", filename, bfd_errmsg(bfd_error)); + /* 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 */ + 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 (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 ("Can't find sections in `%s': %s", bfd_get_filename(core_bfd), - bfd_errmsg (bfd_error)); + 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); ontop = !push_target (&core_ops); discard_cleanups (old_chain); @@ -182,8 +361,12 @@ core_open (filename, from_tty) 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, - safe_strsignal (siggy)); + target_signal_to_string (target_signal_from_host (siggy))); /* Build up thread list from BFD sections. */ @@ -191,32 +374,33 @@ core_open (filename, from_tty) 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); + if (ontop) + { + /* Fetch all registers from core file. */ + target_fetch_registers (-1); - /* Add symbols and section mappings for any shared libraries */ + /* Add symbols and section mappings for any shared libraries. */ #ifdef SOLIB_ADD - catch_errors (solib_add_stub, &from_tty, (char *)0, - RETURN_MASK_ALL); + 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 */ - set_current_frame (create_new_frame (read_fp (), - 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); - } + /* Now, set up the frame cache, and print the top of stack. */ + flush_cached_frames (); + select_frame (get_current_frame ()); + print_stack_frame (deprecated_selected_frame, + frame_relative_level (deprecated_selected_frame), 1); + } + else + { + warning ( + "you won't be able to access this core file until you terminate\n\ +your %s; do ``info files''", target_longname); + } } -void -core_detach (args, from_tty) - char *args; - int from_tty; +static void +core_detach (char *args, int from_tty) { if (args) error ("Too many arguments"); @@ -226,108 +410,232 @@ core_detach (args, 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 */ +/* 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 is zero, do the single-threaded thing: look for a + section named NAME. If inferior_ptid 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_ptid. + + 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_registers (regno) - int regno; +get_core_register_section (char *name, + int which, + char *human_name, + int required) { - sec_ptr reg_sec; - unsigned size; - char *the_regs; - char secname[10]; + char section_name[100]; + struct bfd_section *section; + bfd_size_type size; + char *contents; - /* 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'. */ + if (PIDGET (inferior_ptid)) + sprintf (section_name, "%s/%d", name, PIDGET (inferior_ptid)); + else + strcpy (section_name, name); - /* XXX - same thing needs to be done for floating-point (.reg2) sections. */ + 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; + } - if (inferior_pid) - sprintf (secname, ".reg/%d", inferior_pid); - else - strcpy (secname, ".reg"); + 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; + } - 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)) + if (core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch)) { - fetch_core_registers (the_regs, size, 0, - (unsigned) bfd_section_vma (abfd,reg_sec)); + 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.\n", + human_name); + return; + } + + regset->supply_regset (regset, current_regcache, -1, contents, size); + return; } - else + + gdb_assert (core_vec); + 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. */ + +/* We just get all the registers, so we don't use regno. */ + +static void +get_core_registers (int regno) +{ + int status; + + if (!(core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch)) + && (core_vec == NULL || core_vec->core_read_registers == NULL)) { -cant: - fprintf_filtered (gdb_stderr, "Couldn't fetch registers from core file: %s\n", - bfd_errmsg (bfd_error)); + fprintf_filtered (gdb_stderr, + "Can't fetch registers from this type of core file\n"); + return; } - /* 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_error)); - } - } - registers_fetched(); + 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); + + deprecated_registers_fetched (); } static void -core_files_info (t) - struct target_ops *t; +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, void *readbuf, + const void *writebuf, ULONGEST offset, LONGEST len) +{ + switch (object) + { + case TARGET_OBJECT_MEMORY: + if (readbuf) + return (*ops->to_xfer_memory) (offset, readbuf, len, 0/*write*/, + NULL, ops); + if (writebuf) + return (*ops->to_xfer_memory) (offset, readbuf, 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; + + 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 (addr, contents) - CORE_ADDR addr; - char *contents; +ignore (CORE_ADDR addr, char *contents) { return 0; } -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, - ignore, ignore, /* 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 */ -}; + +/* 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; +} + +/* 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.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_thread_alive = core_file_thread_alive; + 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 (void) { - add_target (&core_ops); + init_core_ops (); + + if (!coreops_suppress_target) + add_target (&core_ops); }