fb4443d8bc
* regcache.c (read_sp): Remove. * gcore.c (derive_stack_segment): Use get_frame_sp instead of read_sp. * infcall.c (call_function_by_hand): Likewise. * ppc-sysv-tdep.c (ppc_sysv_abi_push_dummy_call): Use regcache instead of calling read_sp. * rs6000-tdep.c (rs6000_push_dummy_call): Likewise.
524 lines
15 KiB
C
524 lines
15 KiB
C
/* Generate a core file for the inferior process.
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Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
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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., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "elf-bfd.h"
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#include "infcall.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "objfiles.h"
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#include "symfile.h"
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#include "cli/cli-decode.h"
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#include "gdb_assert.h"
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/* The largest amount of memory to read from the target at once. We
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must throttle it to limit the amount of memory used by GDB during
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generate-core-file for programs with large resident data. */
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#define MAX_COPY_BYTES (1024 * 1024)
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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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/* 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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obfd = bfd_openw (corefilename, default_gcore_target ());
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if (!obfd)
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error (_("Failed to open '%s' for output."), corefilename);
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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 = 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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note_sec = bfd_make_section_anyway (obfd, "note0");
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if (note_sec == 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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warning (_("writing note section (%s)"), bfd_errmsg (bfd_get_error ()));
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}
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/* Succeeded. */
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fprintf_filtered (gdb_stdout, "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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/* Derive a reasonable stack segment by unwinding the target stack,
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and store its limits in *BOTTOM and *TOP. Return non-zero if
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successful. */
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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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struct frame_info *fi, *tmp_fi;
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gdb_assert (bottom);
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gdb_assert (top);
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/* Can't succeed without stack and registers. */
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if (!target_has_stack || !target_has_registers)
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return 0;
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/* Can't succeed without current frame. */
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fi = get_current_frame ();
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if (fi == NULL)
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return 0;
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/* Save frame pointer of TOS frame. */
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*top = get_frame_base (fi);
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/* If current stack pointer is more "inner", use that instead. */
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if (INNER_THAN (get_frame_sp (fi), *top))
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*top = get_frame_sp (fi);
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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 = get_frame_base (fi);
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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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bfd_vma tmp_vma;
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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;
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}
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/* Derive a reasonable heap segment for ABFD by looking at sbrk and
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the static data sections. Store its limits in *BOTTOM and *TOP.
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Return non-zero if successful. */
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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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gdb_assert (bottom);
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gdb_assert (top);
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/* This function depends on being able to call a function in the
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inferior. */
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if (!target_has_execution)
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return 0;
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/* The following code assumes that the link map is arranged as
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follows (low to high addresses):
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---------------------------------
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| text sections |
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---------------------------------
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| data sections (including bss) |
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---------------------------------
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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 (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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sbrk = find_function_in_inferior ("sbrk");
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if (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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sbrk = find_function_in_inferior ("_sbrk");
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if (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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zero = value_from_longest (builtin_type_int, 0);
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gdb_assert (zero);
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sbrk = call_function_by_hand (sbrk, 1, &zero);
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if (sbrk == 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;
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}
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/* No additional heap space needs to be saved. */
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return 0;
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}
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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, 0, 0, 1, &osec);
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}
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static int
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gcore_create_callback (CORE_ADDR vaddr, unsigned long size,
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int read, int write, int exec, void *data)
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{
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bfd *obfd = data;
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asection *osec;
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flagword flags = SEC_ALLOC | SEC_HAS_CONTENTS | SEC_LOAD;
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/* If the memory segment has no permissions set, ignore it, otherwise
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when we later try to access it for read/write, we'll get an error
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or jam the kernel. */
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if (read == 0 && write == 0 && exec == 0)
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{
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if (info_verbose)
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{
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fprintf_filtered (gdb_stdout, "Ignore segment, %s bytes at 0x%s\n",
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paddr_d (size), paddr_nz (vaddr));
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}
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return 0;
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}
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if (write == 0)
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{
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/* See if this region of memory lies inside a known file on disk.
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If so, we can avoid copying its contents by clearing SEC_LOAD. */
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struct objfile *objfile;
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struct obj_section *objsec;
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ALL_OBJSECTIONS (objfile, objsec)
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{
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bfd *abfd = objfile->obfd;
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asection *asec = objsec->the_bfd_section;
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bfd_vma align = (bfd_vma) 1 << bfd_get_section_alignment (abfd,
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asec);
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bfd_vma start = objsec->addr & -align;
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bfd_vma end = (objsec->endaddr + align - 1) & -align;
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/* Match if either the entire memory region lies inside the
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section (i.e. a mapping covering some pages of a large
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segment) or the entire section lies inside the memory region
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(i.e. a mapping covering multiple small sections).
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This BFD was synthesized from reading target memory,
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we don't want to omit that. */
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if (((vaddr >= start && vaddr + size <= end)
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|| (start >= vaddr && end <= vaddr + size))
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&& !(bfd_get_file_flags (abfd) & BFD_IN_MEMORY))
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{
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flags &= ~SEC_LOAD;
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goto keep; /* break out of two nested for loops */
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}
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}
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keep:
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flags |= SEC_READONLY;
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}
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if (exec)
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flags |= SEC_CODE;
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else
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flags |= SEC_DATA;
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osec = bfd_make_section_anyway (obfd, "load");
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if (osec == 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 1;
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}
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if (info_verbose)
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{
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fprintf_filtered (gdb_stdout, "Save segment, %s bytes at 0x%s\n",
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paddr_d (size), paddr_nz (vaddr));
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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, vaddr);
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bfd_section_lma (obfd, osec) = 0; /* ??? bfd_set_section_lma? */
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bfd_set_section_flags (obfd, osec, flags);
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return 0;
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}
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static int
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objfile_find_memory_regions (int (*func) (CORE_ADDR, unsigned long,
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int, int, int, 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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ret = (*func) (objsec->addr, 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);
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if (ret != 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, 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, 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, total_size = bfd_section_size (obfd, osec);
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file_ptr offset = 0;
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struct cleanup *old_chain = NULL;
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void *memhunk;
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/* Read-only sections are marked; we don't have to copy their contents. */
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if ((bfd_get_section_flags (obfd, osec) & SEC_LOAD) == 0)
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return;
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/* Only interested in "load" sections. */
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if (strncmp ("load", bfd_section_name (obfd, osec), 4) != 0)
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return;
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size = min (total_size, MAX_COPY_BYTES);
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memhunk = xmalloc (size);
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/* ??? This is crap since xmalloc should never return NULL. */
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if (memhunk == 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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while (total_size > 0)
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{
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if (size > total_size)
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size = total_size;
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if (target_read_memory (bfd_section_vma (obfd, osec) + offset,
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memhunk, size) != 0)
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{
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warning (_("Memory read failed for corefile section, %s bytes at 0x%s."),
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paddr_d (size), paddr (bfd_section_vma (obfd, osec)));
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break;
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}
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if (!bfd_set_section_contents (obfd, osec, memhunk, offset, size))
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{
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warning (_("Failed to write corefile contents (%s)."),
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bfd_errmsg (bfd_get_error ()));
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break;
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}
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total_size -= size;
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offset += size;
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}
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do_cleanups (old_chain); /* Frees MEMHUNK. */
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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. */
|
|
bfd_map_over_sections (obfd, gcore_copy_callback, NULL);
|
|
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
_initialize_gcore (void)
|
|
{
|
|
add_com ("generate-core-file", class_files, gcore_command, _("\
|
|
Save a core file with the current state of the debugged process.\n\
|
|
Argument is optional filename. Default filename is 'core.<process_id>'."));
|
|
|
|
add_com_alias ("gcore", "generate-core-file", class_files, 1);
|
|
exec_set_find_memory_regions (objfile_find_memory_regions);
|
|
}
|