/* Work with core dump and executable files, for GDB.
- Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
+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 1, or (at your option)
-any later version.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
-GDB is distributed in the hope that it will be useful,
+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 GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
-#include "param.h"
+#include <errno.h>
+#include <signal.h>
+#include <fcntl.h>
#include "frame.h" /* required by inferior.h */
#include "inferior.h"
-
-#ifdef USG
-#include <sys/types.h>
-#include <fcntl.h>
+#include "symtab.h"
+#include "command.h"
+#include "bfd.h"
+#include "target.h"
+#include "gdbcore.h"
+
+#ifdef SOLIB_ADD
+static int
+solib_add_stub PARAMS ((char *));
#endif
-#ifdef COFF_ENCAPSULATE
-#include "a.out.encap.h"
-#else
-#include <a.out.h>
-#endif
-#ifndef N_MAGIC
-#ifdef COFF_FORMAT
-#define N_MAGIC(exec) ((exec).magic)
-#else
-#define N_MAGIC(exec) ((exec).a_magic)
-#endif
-#endif
-#include <stdio.h>
-#include <signal.h>
-#include <sys/param.h>
-#include <sys/dir.h>
-#include <sys/file.h>
-#include <sys/stat.h>
-
-#ifdef UMAX_CORE
-#include <sys/ptrace.h>
-#else
-#include <sys/user.h>
-#endif
+static void
+core_close PARAMS ((int));
-#ifndef N_TXTADDR
-#define N_TXTADDR(hdr) 0
-#endif /* no N_TXTADDR */
+static void
+core_open PARAMS ((char *, int));
-#ifndef N_DATADDR
-#define N_DATADDR(hdr) hdr.a_text
-#endif /* no N_DATADDR */
+static void
+core_detach PARAMS ((char *, int));
-#ifndef COFF_FORMAT
-#ifndef AOUTHDR
-#define AOUTHDR struct exec
-#endif
-#endif
+static void
+get_core_registers PARAMS ((int));
-extern char *sys_siglist[];
+static void
+core_files_info PARAMS ((struct target_ops *));
-extern core_file_command (), exec_file_command ();
+extern char registers[];
/* Hook for `exec_file_command' command to call. */
-void (*exec_file_display_hook) ();
-
-/* File names of core file and executable file. */
+void (*exec_file_display_hook) PARAMS ((char *)) = NULL;
-char *corefile;
-char *execfile;
+/* Binary file diddling handle for the core file. */
-/* Descriptors on which core file and executable file are open.
- Note that the execchan is closed when an inferior is created
- and reopened if the inferior dies or is killed. */
+bfd *core_bfd = NULL;
-int corechan;
-int execchan;
+/* Forward decl */
+extern struct target_ops core_ops;
-/* Last modification time of executable file.
- Also used in source.c to compare against mtime of a source file. */
+\f
+/* Discard all vestiges of any previous core file
+ and mark data and stack spaces as empty. */
-int exec_mtime;
+/* ARGSUSED */
+static void
+core_close (quitting)
+ int quitting;
+{
+ if (core_bfd) {
+ free (bfd_get_filename (core_bfd));
+ bfd_close (core_bfd);
+ core_bfd = NULL;
+#ifdef 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;
+ }
+ }
+}
-/* Virtual addresses of bounds of the two areas of memory in the core file. */
+#ifdef SOLIB_ADD
+/* Stub function for catch_errors around shared library hacking. */
-CORE_ADDR data_start;
-CORE_ADDR data_end;
-CORE_ADDR stack_start;
-CORE_ADDR stack_end;
+static int
+solib_add_stub (from_tty)
+ char *from_tty;
+{
+ SOLIB_ADD (NULL, (int)from_tty, &core_ops);
+ return 0;
+}
+#endif /* SOLIB_ADD */
-/* Virtual addresses of bounds of two areas of memory in the exec file.
- Note that the data area in the exec file is used only when there is no core file. */
+/* This routine opens and sets up the core file bfd */
-CORE_ADDR text_start;
-CORE_ADDR text_end;
+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.");
+ }
-CORE_ADDR exec_data_start;
-CORE_ADDR exec_data_end;
+ filename = tilde_expand (filename);
+ if (filename[0] != '/') {
+ temp = concat (current_directory, "/", filename, NULL);
+ free (filename);
+ filename = temp;
+ }
-/* Offset within executable file of start of text area data. */
+ old_chain = make_cleanup (free, filename);
-int text_offset;
+ scratch_chan = open (filename, write_files? O_RDWR: O_RDONLY, 0);
+ if (scratch_chan < 0)
+ perror_with_name (filename);
-/* Offset within executable file of start of data area data. */
+ temp_bfd = bfd_fdopenr (filename, NULL, scratch_chan);
+ if (temp_bfd == NULL)
+ {
+ perror_with_name (filename);
+ }
+
+ if (!bfd_check_format (temp_bfd, bfd_core))
+ {
+ /* 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));
+ }
-int exec_data_offset;
+ /* Looks semi-reasonable. Toss the old core file and work on the new. */
-/* Offset within core file of start of data area data. */
+ 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);
-int data_offset;
+ validate_files ();
-/* Offset within core file of start of stack area data. */
+ /* 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));
-int stack_offset;
-
-#ifdef COFF_FORMAT
-/* various coff data structures */
+ ontop = !push_target (&core_ops);
+ discard_cleanups (old_chain);
-FILHDR file_hdr;
-SCNHDR text_hdr;
-SCNHDR data_hdr;
+ p = bfd_core_file_failing_command (core_bfd);
+ if (p)
+ printf ("Core was generated by `%s'.\n", p);
-#endif /* not COFF_FORMAT */
+ siggy = bfd_core_file_failing_signal (core_bfd);
+ if (siggy > 0)
+ printf ("Program terminated with signal %d, %s.\n", siggy,
+ safe_strsignal (siggy));
-/* a.out header saved in core file. */
-
-AOUTHDR core_aouthdr;
+ 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, (char *)from_tty, (char *)0);
+#endif
+
+ /* Now, set up the frame cache, and print the top of stack */
+ set_current_frame (create_new_frame (read_register (FP_REGNUM),
+ 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);
+ }
+}
+
+static void
+core_detach (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ if (args)
+ error ("Too many arguments");
+ unpush_target (&core_ops);
+ if (from_tty)
+ printf ("No core file now.\n");
+}
-/* a.out header of exec file. */
+/* Backward compatability with old way of specifying core files. */
-AOUTHDR exec_aouthdr;
+void
+core_file_command (filename, from_tty)
+ char *filename;
+ int from_tty;
+{
+ dont_repeat (); /* Either way, seems bogus. */
+ if (!filename)
+ core_detach (filename, from_tty);
+ else
+ core_open (filename, from_tty);
+}
-void validate_files ();
-unsigned int register_addr ();
\f
/* 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) ();
+ void (*hook) PARAMS ((char *));
{
exec_file_display_hook = hook;
}
void
close_exec_file ()
{
- if (execchan >= 0)
- close (execchan);
- execchan = -1;
+#ifdef FIXME
+ if (exec_bfd)
+ bfd_tempclose (exec_bfd);
+#endif
}
void
reopen_exec_file ()
{
- if (execchan < 0 && execfile != 0)
- {
- char *filename = concat (execfile, "", "");
- exec_file_command (filename, 0);
- free (filename);
- }
+#ifdef FIXME
+ if (exec_bfd)
+ bfd_reopen (exec_bfd);
+#endif
}
\f
/* If we have both a core file and an exec file,
- print a warning if they don't go together.
- This should really check that the core file came
- from that exec file, but I don't know how to do it. */
+ print a warning if they don't go together. */
void
validate_files ()
{
- if (execfile != 0 && corefile != 0)
+ if (exec_bfd && core_bfd)
{
- struct stat st_core;
-
- fstat (corechan, &st_core);
-
- if (N_MAGIC (core_aouthdr) != 0
- && bcmp (&core_aouthdr, &exec_aouthdr, sizeof core_aouthdr))
- printf ("Warning: core file does not match specified executable file.\n");
- else if (exec_mtime > st_core.st_mtime)
- printf ("Warning: exec file is newer than core file.\n");
+ 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.");
}
}
get_exec_file (err)
int err;
{
- if (err && execfile == 0)
- error ("No executable file specified.\n\
-Use the \"exec-file\" and \"symbol-file\" commands.");
- return execfile;
+ 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;
}
-int
-have_core_file_p ()
+static void
+core_files_info (t)
+ struct target_ops *t;
{
- return corefile != 0;
+ print_section_info (t, core_bfd);
}
+\f
+/* Report a memory error with error(). */
-static void
-files_info ()
+void
+memory_error (status, memaddr)
+ int status;
+ CORE_ADDR memaddr;
{
- char *symfile;
- extern char *get_sym_file ();
- if (execfile)
- printf ("Executable file \"%s\".\n", execfile);
- else
- printf ("No executable file\n");
- if (corefile == 0)
- printf ("No core dump file\n");
+ if (status == EIO)
+ {
+ /* Actually, address between memaddr and memaddr + len
+ was out of bounds. */
+ error ("Cannot access memory at address %s.", local_hex_string(memaddr));
+ }
else
- printf ("Core dump file \"%s\".\n", corefile);
-
- if (have_inferior_p ())
- printf ("Using the running image of the program, rather than these files.\n");
-
- symfile = get_sym_file ();
- if (symfile != 0)
- printf ("Symbols from \"%s\".\n", symfile);
-
-#ifdef FILES_INFO_HOOK
- if (FILES_INFO_HOOK ())
- return;
-#endif
-
- if (! have_inferior_p ())
{
- if (execfile)
- {
- printf ("Text segment in executable from 0x%x to 0x%x.\n",
- text_start, text_end);
- printf ("Data segment in executable from 0x%x to 0x%x.\n",
- exec_data_start, exec_data_end);
- if (corefile)
- printf ("(But since we have a core file, we're using...)\n");
- }
- if (corefile)
- {
- printf ("Data segment in core file from 0x%x to 0x%x.\n",
- data_start, data_end);
- printf ("Stack segment in core file from 0x%x to 0x%x.\n",
- stack_start, stack_end);
- }
+ error ("Error accessing memory address %s: %s.",
+ local_hex_string (memaddr), safe_strerror (status));
}
}
-\f
-/* Read "memory data" from core file and/or executable file.
- Returns zero if successful, 1 if xfer_core_file failed, errno value if
- ptrace failed. */
-int
+/* 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;
{
- if (len == 0)
- return 0;
-
- if (have_inferior_p ())
- {
- if (remote_debugging)
- return remote_read_inferior_memory (memaddr, myaddr, len);
- else
- return read_inferior_memory (memaddr, myaddr, len);
- }
- else
- return xfer_core_file (memaddr, myaddr, len);
+ int status;
+ status = target_read_memory (memaddr, myaddr, len);
+ if (status != 0)
+ memory_error (status, memaddr);
}
-/* Write LEN bytes of data starting at address MYADDR
- into debugged program memory at address MEMADDR.
- Returns zero if successful, or an errno value if ptrace failed. */
-
-int
+/* 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;
{
- if (have_inferior_p ())
- {
- if (remote_debugging)
- return remote_write_inferior_memory (memaddr, myaddr, len);
- else
- return write_inferior_memory (memaddr, myaddr, len);
- }
- else
- error ("Can write memory only when program being debugged is running.");
-}
+ int status;
-#ifndef XFER_CORE_FILE
-/* Read from the program's memory (except for inferior processes).
- This function is misnamed, since it only reads, never writes; and
- since it will use the core file and/or executable file as necessary.
-
- It should be extended to write as well as read, FIXME, for patching files.
+ status = target_write_memory (memaddr, myaddr, len);
+ if (status != 0)
+ memory_error (status, memaddr);
+}
- Return 0 if address could be read, 1 if not. */
+/* Read an integer from debugged memory, given address and number of bytes. */
-int
-xfer_core_file (memaddr, myaddr, len)
+long
+read_memory_integer (memaddr, len)
CORE_ADDR memaddr;
- char *myaddr;
int len;
{
- register int i;
- register int val;
- int xferchan;
- char **xferfile;
- int fileptr;
- int returnval = 0;
-
- while (len > 0)
+ char cbuf;
+ short sbuf;
+ int ibuf;
+ long lbuf;
+
+ if (len == sizeof (char))
{
- xferfile = 0;
- xferchan = 0;
-
- /* Determine which file the next bunch of addresses reside in,
- and where in the file. Set the file's read/write pointer
- to point at the proper place for the desired address
- and set xferfile and xferchan for the correct file.
-
- If desired address is nonexistent, leave them zero.
-
- i is set to the number of bytes that can be handled
- along with the next address.
-
- We put the most likely tests first for efficiency. */
-
- /* Note that if there is no core file
- data_start and data_end are equal. */
- if (memaddr >= data_start && memaddr < data_end)
- {
- i = min (len, data_end - memaddr);
- fileptr = memaddr - data_start + data_offset;
- xferfile = &corefile;
- xferchan = corechan;
- }
- /* Note that if there is no core file
- stack_start and stack_end are equal. */
- else if (memaddr >= stack_start && memaddr < stack_end)
- {
- i = min (len, stack_end - memaddr);
- fileptr = memaddr - stack_start + stack_offset;
- xferfile = &corefile;
- xferchan = corechan;
- }
- else if (corechan < 0
- && memaddr >= exec_data_start && memaddr < exec_data_end)
- {
- i = min (len, exec_data_end - memaddr);
- fileptr = memaddr - exec_data_start + exec_data_offset;
- xferfile = &execfile;
- xferchan = execchan;
- }
- else if (memaddr >= text_start && memaddr < text_end)
- {
- i = min (len, text_end - memaddr);
- fileptr = memaddr - text_start + text_offset;
- xferfile = &execfile;
- xferchan = execchan;
- }
- else if (memaddr < text_start)
- {
- i = min (len, text_start - memaddr);
- }
- else if (memaddr >= text_end
- && memaddr < (corechan >= 0? data_start : exec_data_start))
- {
- i = min (len, data_start - memaddr);
- }
- else if (corechan >= 0
- && memaddr >= data_end && memaddr < stack_start)
- {
- i = min (len, stack_start - memaddr);
- }
- else if (corechan < 0 && memaddr >= exec_data_end)
- {
- /* Since there is nothing at higher addresses than data
- (without a core file or an inferior, there is no
- stack, set i to do the rest of the operation now. */
- i = len;
- }
- else if (memaddr >= stack_end && stack_end != 0)
- {
- /* Since there is nothing at higher addresses than
- the stack, set i to do the rest of the operation now. */
- i = len;
- }
- else
- {
- /* Address did not classify into one of the known ranges.
- This shouldn't happen; we catch the endpoints. */
- fatal ("Internal: Bad case logic in xfer_core_file.");
- }
-
- /* Now we know which file to use.
- Set up its pointer and transfer the data. */
- if (xferfile)
- {
- if (*xferfile == 0)
- if (xferfile == &execfile)
- error ("No program file to examine.");
- else
- error ("No core dump file or running program to examine.");
- val = lseek (xferchan, fileptr, 0);
- if (val < 0)
- perror_with_name (*xferfile);
- val = myread (xferchan, myaddr, i);
- if (val < 0)
- perror_with_name (*xferfile);
- }
- /* If this address is for nonexistent memory,
- read zeros if reading, or do nothing if writing.
- Actually, we never right. */
- else
- {
- bzero (myaddr, i);
- returnval = 1;
- }
-
- memaddr += i;
- myaddr += i;
- len -= i;
+ read_memory (memaddr, &cbuf, len);
+ return cbuf;
}
- return returnval;
-}
-#endif /* XFER_CORE_FILE */
-\f
-/* My replacement for the read system call.
- Used like `read' but keeps going if `read' returns too soon. */
-
-int
-myread (desc, addr, len)
- int desc;
- char *addr;
- int len;
-{
- register int val;
- int orglen = len;
-
- while (len > 0)
+ if (len == sizeof (short))
+ {
+ read_memory (memaddr, (char *)&sbuf, len);
+ SWAP_TARGET_AND_HOST (&sbuf, sizeof (short));
+ return sbuf;
+ }
+ if (len == sizeof (int))
+ {
+ read_memory (memaddr, (char *)&ibuf, len);
+ SWAP_TARGET_AND_HOST (&ibuf, sizeof (int));
+ return ibuf;
+ }
+ if (len == sizeof (lbuf))
{
- val = read (desc, addr, len);
- if (val < 0)
- return val;
- if (val == 0)
- return orglen - len;
- len -= val;
- addr += val;
+ read_memory (memaddr, (char *)&lbuf, len);
+ SWAP_TARGET_AND_HOST (&lbuf, sizeof (lbuf));
+ return lbuf;
}
- return orglen;
+ error ("Cannot handle integers of %d bytes.", len);
+ return -1; /* for lint */
}
\f
-#ifdef REGISTER_U_ADDR
-
-/* Return the address in the core dump or inferior of register REGNO.
- BLOCKEND is the address of the end of the user structure. */
+/* 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. */
-unsigned int
-register_addr (regno, blockend)
+/* We just get all the registers, so we don't use regno. */
+/* ARGSUSED */
+static void
+get_core_registers (regno)
int regno;
- int blockend;
{
- int addr;
-
- if (regno < 0 || regno >= NUM_REGS)
- error ("Invalid register number %d.", regno);
-
- REGISTER_U_ADDR (addr, blockend, regno);
+ sec_ptr reg_sec;
+ unsigned size;
+ char *the_regs;
+
+ reg_sec = bfd_get_section_by_name (core_bfd, ".reg");
+ 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))
+ {
+ fetch_core_registers (the_regs, size, 0,
+ (unsigned) bfd_section_vma (abfd,reg_sec));
+ }
+ else
+ {
+cant:
+ fprintf (stderr, "Couldn't fetch registers from core file: %s\n",
+ bfd_errmsg (bfd_error));
+ }
- return addr;
+ /* 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 (stderr, "Couldn't fetch register set 2 from core file: %s\n",
+ bfd_errmsg (bfd_error));
+ }
+ }
+ registers_fetched();
}
-
-#endif /* REGISTER_U_ADDR */
\f
+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,
+ child_attach, core_detach, 0, 0, /* resume, wait */
+ get_core_registers,
+ 0, 0, 0, 0, /* store_regs, prepare_to_store, conv_to, conv_from */
+ xfer_memory, core_files_info,
+ 0, 0, /* core_insert_breakpoint, core_remove_breakpoint, */
+ 0, 0, 0, 0, 0, /* terminal stuff */
+ 0, 0, 0, /* kill, load, lookup sym */
+ child_create_inferior, 0, /* mourn_inferior */
+ 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 */
+};
+
void
_initialize_core()
{
- corechan = -1;
- execchan = -1;
- corefile = 0;
- execfile = 0;
- exec_file_display_hook = 0;
-
- text_start = 0;
- text_end = 0;
- data_start = 0;
- data_end = 0;
- exec_data_start = 0;
- exec_data_end = 0;
- stack_start = STACK_END_ADDR;
- stack_end = STACK_END_ADDR;
add_com ("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.");
- add_com ("exec-file", class_files, exec_file_command,
- "Use FILE as program for getting contents of pure memory.\n\
-If FILE cannot be found as specified, your execution directory path\n\
-is searched for a command of that name.\n\
-No arg means have no executable file.");
- add_info ("files", files_info, "Names of files being debugged.");
+No arg means have no core file. This command has been superseded by the\n\
+`target core' and `detach' commands.");
+ add_target (&core_ops);
}
-
projects / deliverable / binutils-gdb.git / blobdiff