diff options
Diffstat (limited to 'contrib/gdb/gdb/corelow.c')
| -rw-r--r-- | contrib/gdb/gdb/corelow.c | 456 |
1 files changed, 242 insertions, 214 deletions
diff --git a/contrib/gdb/gdb/corelow.c b/contrib/gdb/gdb/corelow.c index e635257..68219c5 100644 --- a/contrib/gdb/gdb/corelow.c +++ b/contrib/gdb/gdb/corelow.c @@ -1,30 +1,34 @@ /* Core dump and executable file functions below target vector, for GDB. - Copyright 1986, 87, 89, 91, 92, 93, 94, 95, 96, 97, 1998 + Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, + 1998, 1999, 2000, 2001 Free Software Foundation, Inc. -This file is part of GDB. + 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 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. + 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. */ + 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 <unistd.h> -#include "frame.h" /* required by inferior.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" @@ -32,6 +36,12 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "target.h" #include "gdbcore.h" #include "gdbthread.h" +#include "regcache.h" +#include "symfile.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 @@ -39,31 +49,40 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ static struct core_fns *core_file_fns = NULL; -static void core_files_info PARAMS ((struct target_ops *)); +/* 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 (struct target_ops *); #ifdef SOLIB_ADD -static int solib_add_stub PARAMS ((PTR)); +static int solib_add_stub (PTR); #endif -static void core_open PARAMS ((char *, int)); +static struct core_fns *sniff_core_bfd (bfd *); + +static boolean gdb_check_format (bfd *); + +static void core_open (char *, int); -static void core_detach PARAMS ((char *, int)); +static void core_detach (char *, int); -static void core_close PARAMS ((int)); +static void core_close (int); -static void get_core_registers PARAMS ((int)); +static void core_close_cleanup (void *ignore); -static void add_to_thread_list PARAMS ((bfd *, asection *, PTR)); +static void get_core_registers (int); -static int ignore PARAMS ((CORE_ADDR, char *)); +static void add_to_thread_list (bfd *, asection *, PTR); -static char *core_file_to_sym_file PARAMS ((char *)); +static int ignore (CORE_ADDR, char *); -static int core_file_thread_alive PARAMS ((int tid)); +static int core_file_thread_alive (ptid_t tid); -static void init_core_ops PARAMS ((void)); +static void init_core_ops (void); -void _initialize_corelow PARAMS ((void)); +void _initialize_corelow (void); struct target_ops core_ops; @@ -73,55 +92,138 @@ struct target_ops core_ops; handle. */ void -add_core_fns (cf) - struct core_fns *cf; +add_core_fns (struct core_fns *cf) { - cf -> next = core_file_fns; + 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;; + + 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 boolean +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) { char *name; if (core_bfd) { - inferior_pid = 0; /* Avoid confusion from thread stuff */ + inferior_ptid = null_ptid; /* 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); + xfree (name); core_bfd = NULL; -#ifdef CLEAR_SOLIB - CLEAR_SOLIB (); -#endif if (core_ops.to_sections) { - free ((PTR)core_ops.to_sections); + xfree (core_ops.to_sections); core_ops.to_sections = NULL; core_ops.to_sections_end = NULL; } } + core_vec = 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) - PTR from_ttyp; +static int +solib_add_stub (PTR from_ttyp) { - SOLIB_ADD (NULL, *(int *)from_ttyp, ¤t_target); + SOLIB_ADD (NULL, *(int *) from_ttyp, ¤t_target, auto_solib_add); re_enable_breakpoints_in_shlibs (); return 0; } @@ -131,10 +233,7 @@ 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, PTR reg_sect_arg) { int thread_id; asection *reg_sect = (asection *) reg_sect_arg; @@ -144,21 +243,19 @@ 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 (reg_sect != NULL - && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ - inferior_pid = thread_id; /* Yes, make it current */ + && 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. */ static void -core_open (filename, from_tty) - char *filename; - int from_tty; +core_open (char *filename, int from_tty) { const char *p; int siggy; @@ -171,22 +268,22 @@ 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); + 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); @@ -194,23 +291,27 @@ core_open (filename, from_tty) if (temp_bfd == NULL) 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 */ /* 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); + 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 ((make_cleanup_func) core_close, core_bfd); + old_chain = make_cleanup (core_close_cleanup, 0 /*ignore*/); + + /* Find a suitable core file handler to munch on core_bfd */ + core_vec = sniff_core_bfd (core_bfd); validate_files (); @@ -220,6 +321,8 @@ core_open (filename, from_tty) error ("\"%s\": Can't find sections: %s", bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); + set_gdbarch_from_file (core_bfd); + ontop = !push_target (&core_ops); discard_cleanups (old_chain); @@ -229,8 +332,12 @@ 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. */ @@ -245,7 +352,7 @@ core_open (filename, from_tty) /* Add symbols and section mappings for any shared libraries. */ #ifdef SOLIB_ADD - catch_errors (solib_add_stub, &from_tty, (char *)0, + catch_errors (solib_add_stub, &from_tty, (char *) 0, RETURN_MASK_ALL); #endif @@ -257,15 +364,13 @@ core_open (filename, from_tty) else { warning ( -"you won't be able to access this core file until you terminate\n\ + "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; +core_detach (char *args, int from_tty) { if (args) error ("Too many arguments"); @@ -275,164 +380,91 @@ 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. */ +/* 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. -/* ARGSUSED */ -static void -get_core_registers (regno) - int regno; -{ - sec_ptr reg_sec; - unsigned size; - char *the_regs; - char secname[30]; - enum bfd_flavour our_flavour = bfd_get_flavour (core_bfd); - struct core_fns *cf = NULL; - - if (core_file_fns == NULL) - { - fprintf_filtered (gdb_stderr, - "Can't fetch registers from this type of core file\n"); - return; - } + 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. - /* 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'. */ + HUMAN_NAME is a human-readable name for the kind of registers the + NAME section contains, for use in error messages. - /* XXX - same thing needs to be done for floating-point (.reg2) sections. */ + 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. */ - 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); - /* Look for the core functions that match this flavor. Default to the - first one if nothing matches. */ - for (cf = core_file_fns; cf != NULL; cf = cf -> next) - { - if (our_flavour == cf -> core_flavour) - { - break; - } - } - if (cf == NULL) - { - cf = core_file_fns; - } - if (cf != NULL && - bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size) && - cf -> core_read_registers != NULL) - { - (cf -> core_read_registers (the_regs, size, 0, - (unsigned) bfd_section_vma (abfd,reg_sec))); - } +static void +get_core_register_section (char *name, + int which, + char *human_name, + int required) +{ + char section_name[100]; + sec_ptr section; + bfd_size_type size; + char *contents; + + if (PIDGET (inferior_ptid)) + sprintf (section_name, "%s/%d", name, PIDGET (inferior_ptid)); else + strcpy (section_name, name); + + section = bfd_get_section_by_name (core_bfd, section_name); + if (! section) { -cant: - fprintf_filtered (gdb_stderr, - "Couldn't fetch registers from core file: %s\n", - bfd_errmsg (bfd_get_error ())); + if (required) + warning ("Couldn't find %s registers in core file.\n", human_name); + 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, section); + contents = alloca (size); + if (! bfd_get_section_contents (core_bfd, section, contents, + (file_ptr) 0, size)) { - size = bfd_section_size (core_bfd, reg_sec); - the_regs = alloca (size); - if (cf != NULL && - bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size) && - cf -> core_read_registers != NULL) - { - (cf -> 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 ())); - } + warning ("Couldn't read %s registers from `%s' section in core file.\n", + human_name, name); + return; } - 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; + core_vec->core_read_registers (contents, size, which, + ((CORE_ADDR) + bfd_section_vma (core_bfd, section))); +} - if (! core) - error ("No core file specified."); - core = tilde_expand (core); - if (core[0] != '/') - { - temp = concat (current_directory, "/", core, NULL); - core = temp; - } +/* 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. */ - scratch_chan = open (core, write_files ? O_RDWR : O_RDONLY, 0); - if (scratch_chan < 0) - perror_with_name (core); +/* We just get all the registers, so we don't use regno. */ - temp_bfd = bfd_fdopenr (core, gnutarget, scratch_chan); - if (temp_bfd == NULL) - perror_with_name (core); +/* ARGSUSED */ +static void +get_core_registers (int regno) +{ + int status; - if (!bfd_check_format (temp_bfd, bfd_core)) + if (core_vec == NULL + || core_vec->core_read_registers == NULL) { - /* 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 ())); + fprintf_filtered (gdb_stderr, + "Can't fetch registers from this type of core file\n"); + return; } - /* 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); + 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); - 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; + 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); } @@ -441,9 +473,7 @@ core_files_info (t) `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; } @@ -454,10 +484,9 @@ ignore (addr, contents) 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; +core_file_thread_alive (ptid_t tid) { return 1; } @@ -465,7 +494,7 @@ core_file_thread_alive (tid) /* Fill in core_ops with its defined operations and properties. */ static void -init_core_ops () +init_core_ops (void) { core_ops.to_shortname = "core"; core_ops.to_longname = "Local core dump file"; @@ -485,12 +514,11 @@ init_core_ops () 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; + core_ops.to_magic = OPS_MAGIC; } /* non-zero if we should not do the add_target call in @@ -502,7 +530,7 @@ init_core_ops () int coreops_suppress_target; void -_initialize_corelow () +_initialize_corelow (void) { init_core_ops (); |
