467 lines
13 KiB
C
467 lines
13 KiB
C
/* Generate a core file for the inferior process.
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Copyright 2001, 2002 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "cli/cli-decode.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "elf-bfd.h"
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#include "symfile.h"
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#include "objfiles.h"
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static char *default_gcore_target (void);
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static enum bfd_architecture default_gcore_arch (void);
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static unsigned long default_gcore_mach (void);
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static int gcore_memory_sections (bfd *);
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/* Function: gcore_command
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Generate a core file from the inferior process. */
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static void
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gcore_command (char *args, int from_tty)
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{
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struct cleanup *old_chain;
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char *corefilename, corefilename_buffer[40];
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asection *note_sec = NULL;
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bfd *obfd;
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void *note_data = NULL;
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int note_size = 0;
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/* No use generating a corefile without a target process. */
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if (!(target_has_execution))
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noprocess ();
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if (args && *args)
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corefilename = args;
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else
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{
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/* Default corefile name is "core.PID". */
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sprintf (corefilename_buffer, "core.%d", PIDGET (inferior_ptid));
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corefilename = corefilename_buffer;
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}
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if (info_verbose)
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fprintf_filtered (gdb_stdout,
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"Opening corefile '%s' for output.\n", corefilename);
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/* Open the output file. */
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if (!(obfd = bfd_openw (corefilename, default_gcore_target ())))
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{
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error ("Failed to open '%s' for output.", corefilename);
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}
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/* Need a cleanup that will close the file (FIXME: delete it?). */
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old_chain = make_cleanup_bfd_close (obfd);
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bfd_set_format (obfd, bfd_core);
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bfd_set_arch_mach (obfd, default_gcore_arch (), default_gcore_mach ());
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/* An external target method must build the notes section. */
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note_data = (char *) target_make_corefile_notes (obfd, ¬e_size);
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/* Create the note section. */
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if (note_data != NULL && note_size != 0)
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{
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if ((note_sec = bfd_make_section_anyway (obfd, "note0")) == NULL)
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error ("Failed to create 'note' section for corefile: %s",
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bfd_errmsg (bfd_get_error ()));
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bfd_set_section_vma (obfd, note_sec, 0);
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bfd_set_section_flags (obfd, note_sec,
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SEC_HAS_CONTENTS | SEC_READONLY | SEC_ALLOC);
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bfd_set_section_alignment (obfd, note_sec, 0);
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bfd_set_section_size (obfd, note_sec, note_size);
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}
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/* Now create the memory/load sections. */
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if (gcore_memory_sections (obfd) == 0)
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error ("gcore: failed to get corefile memory sections from target.");
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/* Write out the contents of the note section. */
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if (note_data != NULL && note_size != 0)
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{
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if (!bfd_set_section_contents (obfd, note_sec, note_data, 0, note_size))
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{
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warning ("writing note section (%s)",
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bfd_errmsg (bfd_get_error ()));
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}
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}
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/* Succeeded. */
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fprintf_filtered (gdb_stdout,
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"Saved corefile %s\n", corefilename);
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/* Clean-ups will close the output file and free malloc memory. */
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do_cleanups (old_chain);
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return;
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}
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static unsigned long
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default_gcore_mach (void)
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{
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#if 1 /* See if this even matters... */
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return 0;
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#else
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#ifdef TARGET_ARCHITECTURE
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const struct bfd_arch_info * bfdarch = TARGET_ARCHITECTURE;
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if (bfdarch != NULL)
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return bfdarch->mach;
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#endif /* TARGET_ARCHITECTURE */
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if (exec_bfd == NULL)
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error ("Can't find default bfd machine type (need execfile).");
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return bfd_get_mach (exec_bfd);
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#endif /* 1 */
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}
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static enum bfd_architecture
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default_gcore_arch (void)
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{
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#ifdef TARGET_ARCHITECTURE
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const struct bfd_arch_info * bfdarch = TARGET_ARCHITECTURE;
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if (bfdarch != NULL)
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return bfdarch->arch;
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#endif
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if (exec_bfd == NULL)
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error ("Can't find bfd architecture for corefile (need execfile).");
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return bfd_get_arch (exec_bfd);
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}
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static char *
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default_gcore_target (void)
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{
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/* FIXME -- this may only work for ELF targets. */
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if (exec_bfd == NULL)
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return NULL;
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else
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return bfd_get_target (exec_bfd);
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}
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/* Function: derive_stack_segment
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Derive a reasonable stack segment by unwinding the target stack.
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Returns 0 for failure, 1 for success. */
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static int
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derive_stack_segment (bfd_vma *bottom, bfd_vma *top)
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{
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bfd_vma tmp_vma;
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struct frame_info *fi, *tmp_fi;
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if (bottom == NULL || top == NULL)
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return 0; /* Paranoia. */
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if (!target_has_stack || !target_has_registers)
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return 0; /* Can't succeed without stack and registers. */
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if ((fi = get_current_frame ()) == NULL)
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return 0; /* Can't succeed without current frame. */
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/* Save frame pointer of TOS frame. */
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*top = fi->frame;
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/* If current stack pointer is more "inner", use that instead. */
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if (INNER_THAN (read_sp (), *top))
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*top = read_sp ();
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/* Find prev-most frame. */
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while ((tmp_fi = get_prev_frame (fi)) != NULL)
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fi = tmp_fi;
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/* Save frame pointer of prev-most frame. */
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*bottom = fi->frame;
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/* Now canonicalize their order, so that 'bottom' is a lower address
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(as opposed to a lower stack frame). */
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if (*bottom > *top)
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{
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tmp_vma = *top;
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*top = *bottom;
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*bottom = tmp_vma;
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}
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return 1; /* success */
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}
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/* Function: derive_heap_segment
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Derive a reasonable heap segment by looking at sbrk and
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the static data sections.
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Returns 0 for failure, 1 for success. */
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static int
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derive_heap_segment (bfd *abfd, bfd_vma *bottom, bfd_vma *top)
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{
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bfd_vma top_of_data_memory = 0;
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bfd_vma top_of_heap = 0;
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bfd_size_type sec_size;
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struct value *zero, *sbrk;
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bfd_vma sec_vaddr;
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asection *sec;
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if (bottom == NULL || top == NULL)
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return 0; /* Paranoia. */
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if (!target_has_execution)
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return 0; /* This function depends on being able
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to call a function in the inferior. */
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/* Assumption: link map is arranged as follows (low to high addresses):
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text sections
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data sections (including bss)
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heap
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*/
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for (sec = abfd->sections; sec; sec = sec->next)
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{
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if (bfd_get_section_flags (abfd, sec) & SEC_DATA ||
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strcmp (".bss", bfd_section_name (abfd, sec)) == 0)
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{
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sec_vaddr = bfd_get_section_vma (abfd, sec);
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sec_size = bfd_get_section_size_before_reloc (sec);
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if (sec_vaddr + sec_size > top_of_data_memory)
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top_of_data_memory = sec_vaddr + sec_size;
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}
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}
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/* Now get the top-of-heap by calling sbrk in the inferior. */
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if (lookup_minimal_symbol ("sbrk", NULL, NULL) != NULL)
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{
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if ((sbrk = find_function_in_inferior ("sbrk")) == NULL)
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return 0;
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}
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else if (lookup_minimal_symbol ("_sbrk", NULL, NULL) != NULL)
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{
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if ((sbrk = find_function_in_inferior ("_sbrk")) == NULL)
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return 0;
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}
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else
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return 0;
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if ((zero = value_from_longest (builtin_type_int, (LONGEST) 0)) == NULL)
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return 0;
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if ((sbrk = call_function_by_hand (sbrk, 1, &zero)) == NULL)
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return 0;
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top_of_heap = value_as_long (sbrk);
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/* Return results. */
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if (top_of_heap > top_of_data_memory)
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{
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*bottom = top_of_data_memory;
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*top = top_of_heap;
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return 1; /* success */
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}
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else
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return 0; /* No additional heap space needs to be saved. */
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}
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/* ARGSUSED */
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static void
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make_output_phdrs (bfd *obfd, asection *osec, void *ignored)
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{
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int p_flags = 0;
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int p_type;
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/* FIXME: these constants may only be applicable for ELF. */
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if (strncmp (bfd_section_name (obfd, osec), "load", 4) == 0)
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p_type = PT_LOAD;
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else
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p_type = PT_NOTE;
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p_flags |= PF_R; /* Segment is readable. */
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if (!(bfd_get_section_flags (obfd, osec) & SEC_READONLY))
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p_flags |= PF_W; /* Segment is writable. */
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if (bfd_get_section_flags (obfd, osec) & SEC_CODE)
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p_flags |= PF_X; /* Segment is executable. */
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bfd_record_phdr (obfd, p_type, 1, p_flags, 0, 0,
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0, 0, 1, &osec);
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}
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static asection *
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make_mem_sec (bfd *obfd,
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bfd_vma addr,
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bfd_size_type size,
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unsigned int flags,
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unsigned int alignment)
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{
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asection *osec;
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if ((osec = bfd_make_section_anyway (obfd, "load")) == NULL)
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{
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warning ("Couldn't make gcore segment: %s",
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bfd_errmsg (bfd_get_error ()));
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return NULL;
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}
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if (info_verbose)
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{
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fprintf_filtered (gdb_stdout,
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"Save segment, %lld bytes at 0x%s\n",
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(long long) size, paddr_nz (addr));
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}
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bfd_set_section_size (obfd, osec, size);
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bfd_set_section_vma (obfd, osec, addr);
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osec->lma = 0; /* FIXME: there should be a macro for this! */
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bfd_set_section_alignment (obfd, osec, alignment);
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bfd_set_section_flags (obfd, osec,
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flags | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS);
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return osec;
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}
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static int
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gcore_create_callback (CORE_ADDR vaddr,
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unsigned long size,
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int read, int write, int exec,
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void *data)
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{
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flagword flags = 0;
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if (write == 0)
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{
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flags |= SEC_READONLY;
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/* Set size == zero for readonly sections. */
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size = 0;
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}
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if (exec)
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{
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flags |= SEC_CODE;
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}
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else
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{
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flags |= SEC_DATA;
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}
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return ((make_mem_sec ((bfd *) data, vaddr, size, flags, 0)) == NULL);
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}
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static int
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objfile_find_memory_regions (int (*func) (CORE_ADDR,
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unsigned long,
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int, int, int,
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void *),
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void *obfd)
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{
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/* Use objfile data to create memory sections. */
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struct objfile *objfile;
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struct obj_section *objsec;
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bfd_vma temp_bottom, temp_top;
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/* Call callback function for each objfile section. */
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ALL_OBJSECTIONS (objfile, objsec)
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{
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bfd *ibfd = objfile->obfd;
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asection *isec = objsec->the_bfd_section;
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flagword flags = bfd_get_section_flags (ibfd, isec);
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int ret;
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if ((flags & SEC_ALLOC) || (flags & SEC_LOAD))
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{
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int size = bfd_section_size (ibfd, isec);
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int ret;
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if ((ret = (*func) (objsec->addr,
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bfd_section_size (ibfd, isec),
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1, /* All sections will be readable. */
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(flags & SEC_READONLY) == 0, /* writable */
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(flags & SEC_CODE) != 0, /* executable */
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obfd)) != 0)
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return ret;
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}
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}
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/* Make a stack segment. */
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if (derive_stack_segment (&temp_bottom, &temp_top))
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(*func) (temp_bottom,
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temp_top - temp_bottom,
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1, /* Stack section will be readable */
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1, /* Stack section will be writable */
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0, /* Stack section will not be executable */
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obfd);
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/* Make a heap segment. */
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if (derive_heap_segment (exec_bfd, &temp_bottom, &temp_top))
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(*func) (temp_bottom,
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temp_top - temp_bottom,
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1, /* Heap section will be readable */
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1, /* Heap section will be writable */
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0, /* Heap section will not be executable */
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obfd);
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return 0;
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}
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static void
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gcore_copy_callback (bfd *obfd, asection *osec, void *ignored)
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{
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bfd_size_type size = bfd_section_size (obfd, osec);
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struct cleanup *old_chain = NULL;
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void *memhunk;
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if (size == 0)
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return; /* Read-only sections are marked as zero-size.
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We don't have to copy their contents. */
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if (strncmp ("load", bfd_section_name (obfd, osec), 4) != 0)
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return; /* Only interested in "load" sections. */
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if ((memhunk = xmalloc (size)) == NULL)
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error ("Not enough memory to create corefile.");
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old_chain = make_cleanup (xfree, memhunk);
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if (target_read_memory (bfd_section_vma (obfd, osec),
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memhunk, size) != 0)
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warning ("Memory read failed for corefile section, %ld bytes at 0x%s\n",
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(long) size, paddr (bfd_section_vma (obfd, osec)));
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if (!bfd_set_section_contents (obfd, osec, memhunk, 0, size))
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warning ("Failed to write corefile contents (%s).",
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bfd_errmsg (bfd_get_error ()));
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do_cleanups (old_chain); /* frees the xmalloc buffer */
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}
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static int
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gcore_memory_sections (bfd *obfd)
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{
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if (target_find_memory_regions (gcore_create_callback, obfd) != 0)
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return 0; /* FIXME error return/msg? */
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/* Record phdrs for section-to-segment mapping. */
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bfd_map_over_sections (obfd, make_output_phdrs, NULL);
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/* Copy memory region contents. */
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bfd_map_over_sections (obfd, gcore_copy_callback, NULL);
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return 1; /* success */
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}
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void
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_initialize_gcore (void)
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{
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add_com ("generate-core-file", class_files, gcore_command,
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"Save a core file with the current state of the debugged process.\n\
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Argument is optional filename. Default filename is 'core.<process_id>'.");
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add_com_alias ("gcore", "generate-core-file", class_files, 1);
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exec_set_find_memory_regions (objfile_find_memory_regions);
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}
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