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Diffstat (limited to 'gdb/corefile.c')
| -rw-r--r-- | gdb/corefile.c | 479 |
1 files changed, 479 insertions, 0 deletions
diff --git a/gdb/corefile.c b/gdb/corefile.c new file mode 100644 index 00000000000..94e56ebffec --- /dev/null +++ b/gdb/corefile.c @@ -0,0 +1,479 @@ +/* Core dump and executable file functions above target vector, for GDB. + Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994 + 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 "gdbcmd.h" +#include "bfd.h" +#include "target.h" +#include "gdbcore.h" +#include "dis-asm.h" +#include "language.h" +#include "gdb_stat.h" +#include "symfile.h" +#include "objfiles.h" + +extern char registers[]; + +/* Local function declarations. */ + +static void call_extra_exec_file_hooks PARAMS ((char *filename)); + +/* You can have any number of hooks for `exec_file_command' command to call. + If there's only one hook, it is set in exec_file_display hook. + If there are two or more hooks, they are set in exec_file_extra_hooks[], + and exec_file_display_hook is set to a function that calls all of them. + This extra complexity is needed to preserve compatibility with + old code that assumed that only one hook could be set, and which called + exec_file_display_hook directly. */ + +typedef void (*hook_type) PARAMS ((char *)); + +hook_type exec_file_display_hook; /* the original hook */ +static hook_type *exec_file_extra_hooks; /* array of additional hooks */ +static int exec_file_hook_count = 0; /* size of array */ + +/* Binary file diddling handle for the core file. */ + +bfd *core_bfd = NULL; + + +/* Backward compatability with old way of specifying core files. */ + +void +core_file_command (filename, from_tty) + char *filename; + int from_tty; +{ + struct target_ops *t; + + dont_repeat (); /* Either way, seems bogus. */ + + t = find_core_target (); + if (t != NULL) + if (!filename) + (t->to_detach) (filename, from_tty); + else + { + /* Yes, we were given the path of a core file. Do we already + have a symbol file? If not, can we determine it from the + core file? If we can, do so. + */ +#ifdef HPUXHPPA + if (symfile_objfile == NULL) + { + char * symfile; + symfile = t->to_core_file_to_sym_file (filename); + if (symfile) + { + char * symfile_copy = strdup (symfile); + + make_cleanup (free, symfile_copy); + symbol_file_command (symfile_copy, from_tty); + } + else + warning ("Unknown symbols for '%s'; use the 'symbol-file' command.", filename); + } +#endif + (t->to_open) (filename, from_tty); + } + else + error ("GDB can't read core files on this machine."); +} + + +/* If there are two or more functions that wish to hook into exec_file_command, + * this function will call all of the hook functions. */ + +static void +call_extra_exec_file_hooks (filename) + char *filename; +{ + int i; + + for (i = 0; i < exec_file_hook_count; i++) + (*exec_file_extra_hooks[i])(filename); +} + +/* Call this to specify the hook for exec_file_command to call back. + This is called from the x-window display code. */ + +void +specify_exec_file_hook (hook) + void (*hook) PARAMS ((char *)); +{ + hook_type *new_array; + + if (exec_file_display_hook != NULL) + { + /* There's already a hook installed. Arrange to have both it + * and the subsequent hooks called. */ + if (exec_file_hook_count == 0) + { + /* If this is the first extra hook, initialize the hook array. */ + exec_file_extra_hooks = (hook_type *) xmalloc (sizeof(hook_type)); + exec_file_extra_hooks[0] = exec_file_display_hook; + exec_file_display_hook = call_extra_exec_file_hooks; + exec_file_hook_count = 1; + } + + /* Grow the hook array by one and add the new hook to the end. + Yes, it's inefficient to grow it by one each time but since + this is hardly ever called it's not a big deal. */ + exec_file_hook_count++; + new_array = + (hook_type *) xrealloc (exec_file_extra_hooks, + exec_file_hook_count * sizeof(hook_type)); + exec_file_extra_hooks = new_array; + exec_file_extra_hooks[exec_file_hook_count - 1] = hook; + } + else + exec_file_display_hook = hook; +} + +/* The exec file must be closed before running an inferior. + If it is needed again after the inferior dies, it must + be reopened. */ + +void +close_exec_file () +{ +#if 0 /* FIXME */ + if (exec_bfd) + bfd_tempclose (exec_bfd); +#endif +} + +void +reopen_exec_file () +{ +#if 0 /* FIXME */ + if (exec_bfd) + bfd_reopen (exec_bfd); +#else + char *filename; + int res; + struct stat st; + long mtime; + + /* Don't do anything if the current target isn't exec. */ + if (exec_bfd == NULL || strcmp (target_shortname, "exec") != 0) + return; + + /* If the timestamp of the exec file has changed, reopen it. */ + filename = strdup (bfd_get_filename (exec_bfd)); + make_cleanup (free, filename); + mtime = bfd_get_mtime(exec_bfd); + res = stat (filename, &st); + + if (mtime && mtime != st.st_mtime) + exec_file_command (filename, 0); +#endif +} + +/* If we have both a core file and an exec file, + print a warning if they don't go together. */ + +void +validate_files () +{ + if (exec_bfd && core_bfd) + { + if (!core_file_matches_executable_p (core_bfd, exec_bfd)) + warning ("core file may not match specified executable file."); + else if (bfd_get_mtime(exec_bfd) > bfd_get_mtime(core_bfd)) + warning ("exec file is newer than core file."); + } +} + +/* Return the name of the executable file as a string. + ERR nonzero means get error if there is none specified; + otherwise return 0 in that case. */ + +char * +get_exec_file (err) + int err; +{ + if (exec_bfd) return bfd_get_filename(exec_bfd); + if (!err) return NULL; + + error ("No executable file specified.\n\ +Use the \"file\" or \"exec-file\" command."); + return NULL; +} + + +/* Report a memory error with error(). */ + +void +memory_error (status, memaddr) + int status; + CORE_ADDR memaddr; +{ + if (status == EIO) + { + /* Actually, address between memaddr and memaddr + len + was out of bounds. */ + error_begin (); + printf_filtered ("Cannot access memory at address "); + print_address_numeric (memaddr, 1, gdb_stdout); + printf_filtered (".\n"); + return_to_top_level (RETURN_ERROR); + } + else + { + error_begin (); + printf_filtered ("Error accessing memory address "); + print_address_numeric (memaddr, 1, gdb_stdout); + printf_filtered (": %s.\n", + safe_strerror (status)); + return_to_top_level (RETURN_ERROR); + } +} + +/* Same as target_read_memory, but report an error if can't read. */ +void +read_memory (memaddr, myaddr, len) + CORE_ADDR memaddr; + char *myaddr; + int len; +{ + int status; + status = target_read_memory (memaddr, myaddr, len); + if (status != 0) + memory_error (status, memaddr); +} + +void +read_memory_section (memaddr, myaddr, len, bfd_section) + CORE_ADDR memaddr; + char *myaddr; + int len; + asection *bfd_section; +{ + int status; + status = target_read_memory_section (memaddr, myaddr, len, bfd_section); + if (status != 0) + memory_error (status, memaddr); +} + +/* Like target_read_memory, but slightly different parameters. */ + +int +dis_asm_read_memory (memaddr, myaddr, len, info) + bfd_vma memaddr; + bfd_byte *myaddr; + int len; + disassemble_info *info; +{ + return target_read_memory (memaddr, (char *) myaddr, len); +} + +/* Like memory_error with slightly different parameters. */ +void +dis_asm_memory_error (status, memaddr, info) + int status; + bfd_vma memaddr; + disassemble_info *info; +{ + memory_error (status, memaddr); +} + +/* Like print_address with slightly different parameters. */ +void +dis_asm_print_address (addr, info) + bfd_vma addr; + struct disassemble_info *info; +{ + print_address (addr, info->stream); +} + +/* Same as target_write_memory, but report an error if can't write. */ +void +write_memory (memaddr, myaddr, len) + CORE_ADDR memaddr; + char *myaddr; + int len; +{ + int status; + + status = target_write_memory (memaddr, myaddr, len); + if (status != 0) + memory_error (status, memaddr); +} + +/* Read an integer from debugged memory, given address and number of bytes. */ + +LONGEST +read_memory_integer (memaddr, len) + CORE_ADDR memaddr; + int len; +{ + char buf[sizeof (LONGEST)]; + + read_memory (memaddr, buf, len); + return extract_signed_integer (buf, len); +} + +ULONGEST +read_memory_unsigned_integer (memaddr, len) + CORE_ADDR memaddr; + int len; +{ + char buf[sizeof (ULONGEST)]; + + read_memory (memaddr, buf, len); + return extract_unsigned_integer (buf, len); +} + +void +read_memory_string (memaddr, buffer, max_len) + CORE_ADDR memaddr; + char * buffer; + int max_len; +{ + register char * cp; + register int i; + int cnt; + + cp = buffer; + while (1) + { + if (cp - buffer >= max_len) + { + buffer[max_len - 1] = '\0'; + break; + } + cnt = max_len - (cp - buffer); + if (cnt > 8) + cnt = 8; + read_memory (memaddr + (int) (cp - buffer), cp, cnt); + for (i = 0; i < cnt && *cp; i++, cp++) + ; /* null body */ + + if (i < cnt && !*cp) + break; + } +} + + +#if 0 +/* Enable after 4.12. It is not tested. */ + +/* Search code. Targets can just make this their search function, or + if the protocol has a less general search function, they can call this + in the cases it can't handle. */ +void +generic_search (len, data, mask, startaddr, increment, lorange, hirange + addr_found, data_found) + int len; + char *data; + char *mask; + CORE_ADDR startaddr; + int increment; + CORE_ADDR lorange; + CORE_ADDR hirange; + CORE_ADDR *addr_found; + char *data_found; +{ + int i; + CORE_ADDR curaddr = startaddr; + + while (curaddr >= lorange && curaddr < hirange) + { + read_memory (curaddr, data_found, len); + for (i = 0; i < len; ++i) + if ((data_found[i] & mask[i]) != data[i]) + goto try_again; + /* It matches. */ + *addr_found = curaddr; + return; + + try_again: + curaddr += increment; + } + *addr_found = (CORE_ADDR)0; + return; +} +#endif /* 0 */ + +/* The current default bfd target. Points to storage allocated for + gnutarget_string. */ +char *gnutarget; + +/* Same thing, except it is "auto" not NULL for the default case. */ +static char *gnutarget_string; + +static void set_gnutarget_command + PARAMS ((char *, int, struct cmd_list_element *)); + +static void +set_gnutarget_command (ignore, from_tty, c) + char *ignore; + int from_tty; + struct cmd_list_element *c; +{ + if (STREQ (gnutarget_string, "auto")) + gnutarget = NULL; + else + gnutarget = gnutarget_string; +} + +/* Set the gnutarget. */ +void +set_gnutarget (newtarget) + char *newtarget; +{ + if (gnutarget_string != NULL) + free (gnutarget_string); + gnutarget_string = savestring (newtarget, strlen (newtarget)); + set_gnutarget_command (NULL, 0, NULL); +} + +void +_initialize_core() +{ + struct cmd_list_element *c; + c = add_cmd ("core-file", class_files, core_file_command, + "Use FILE as core dump for examining memory and registers.\n\ +No arg means have no core file. This command has been superseded by the\n\ +`target core' and `detach' commands.", &cmdlist); + c->completer = filename_completer; + + c = add_set_cmd ("gnutarget", class_files, var_string_noescape, + (char *) &gnutarget_string, + "Set the current BFD target.\n\ +Use `set gnutarget auto' to specify automatic detection.", + &setlist); + c->function.sfunc = set_gnutarget_command; + add_show_from_set (c, &showlist); + + if (getenv ("GNUTARGET")) + set_gnutarget (getenv ("GNUTARGET")); + else + set_gnutarget ("auto"); +} |