binutils-gdb/gdb/gcore.c

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2002-01-03 Michael Snyder <msnyder@redhat.com> Implement a "generate-core-file" command in gdb, save target state. * gcore.c: New file. Implement new command 'generate-core-file'. Save a corefile image of the current state of the inferior. * linux-proc.c: Add linux-specific code for saving corefiles. * target.h (struct target_ops): Add new target vectors for saving corefiles; to_find_memory_regions and to_make_corefile_notes. (target_find_memory_regions): New macro. (target_make_corefile_notes): New macro. * target.c (update_current_target): Inherit new target methods. (dummy_find_memory_regions): New place-holder method. (dummy_make_corefile_notes): New place-holder method. (init_dummy_target): Initialize new dummy target vectors. * exec.c (exec_set_find_memory_regions): New function. Allow the exec_ops vector for memory regions to be taken over. (exec_make_note_section): New function, target vector method. * defs.h (exec_set_find_memory_regions): Export prototype. * procfs.c (proc_find_memory_regions): New function, corefile method. (procfs_make_note_section): New function, corefile method. (init_procfs_ops): Set new target vector pointers. (find_memory_regions_callback): New function. (procfs_do_thread_registers): New function. (procfs_corefile_thread_callback): New function. * sol-thread.c (sol_find_memory_regions): New function. (sol_make_note_section): New function. (init_sol_thread_ops): Initialize new target vectors. * inftarg.c (inftarg_set_find_memory_regions): New function. Allow to_find_memory_regions vector to be taken over. (inftarg_set_make_corefile_notes): New function. Allow to_make_corefile_notes vector to be taken over. * thread-db.c (thread_db_new_objfile): Don't activate thread-db interface layer if not target_has_execution (may be a corefile). * config/i386/linux.mh: Add gcore.o to NATDEPFILES. * config/sparc/sun4sol2.mh: Ditto. * config/alpha/alpha-linux.mh: Ditto. * config/arm/linux.mh: Ditto. * config/i386/x86-64linux.mh: Ditto. * config/ia64/linux.mh: Ditto. * config/m68k/linux.mh: Ditto. * config/mips/linux.mh: Ditto. * config/powerpc/linux.mh: Ditto. * config/sparc/linux.mh: Ditto.
2002-01-09 01:37:02 +01:00
/* Generate a core file for the inferior process.
Copyright 2001, 2002 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 "cli/cli-decode.h"
2002-01-03 Michael Snyder <msnyder@redhat.com> Implement a "generate-core-file" command in gdb, save target state. * gcore.c: New file. Implement new command 'generate-core-file'. Save a corefile image of the current state of the inferior. * linux-proc.c: Add linux-specific code for saving corefiles. * target.h (struct target_ops): Add new target vectors for saving corefiles; to_find_memory_regions and to_make_corefile_notes. (target_find_memory_regions): New macro. (target_make_corefile_notes): New macro. * target.c (update_current_target): Inherit new target methods. (dummy_find_memory_regions): New place-holder method. (dummy_make_corefile_notes): New place-holder method. (init_dummy_target): Initialize new dummy target vectors. * exec.c (exec_set_find_memory_regions): New function. Allow the exec_ops vector for memory regions to be taken over. (exec_make_note_section): New function, target vector method. * defs.h (exec_set_find_memory_regions): Export prototype. * procfs.c (proc_find_memory_regions): New function, corefile method. (procfs_make_note_section): New function, corefile method. (init_procfs_ops): Set new target vector pointers. (find_memory_regions_callback): New function. (procfs_do_thread_registers): New function. (procfs_corefile_thread_callback): New function. * sol-thread.c (sol_find_memory_regions): New function. (sol_make_note_section): New function. (init_sol_thread_ops): Initialize new target vectors. * inftarg.c (inftarg_set_find_memory_regions): New function. Allow to_find_memory_regions vector to be taken over. (inftarg_set_make_corefile_notes): New function. Allow to_make_corefile_notes vector to be taken over. * thread-db.c (thread_db_new_objfile): Don't activate thread-db interface layer if not target_has_execution (may be a corefile). * config/i386/linux.mh: Add gcore.o to NATDEPFILES. * config/sparc/sun4sol2.mh: Ditto. * config/alpha/alpha-linux.mh: Ditto. * config/arm/linux.mh: Ditto. * config/i386/x86-64linux.mh: Ditto. * config/ia64/linux.mh: Ditto. * config/m68k/linux.mh: Ditto. * config/mips/linux.mh: Ditto. * config/powerpc/linux.mh: Ditto. * config/sparc/linux.mh: Ditto.
2002-01-09 01:37:02 +01:00
#include "inferior.h"
#include "gdbcore.h"
#include "elf-bfd.h"
#include <sys/procfs.h>
#include "symfile.h"
#include "objfiles.h"
static char *default_gcore_target (void);
static enum bfd_architecture default_gcore_arch (void);
static unsigned long default_gcore_mach (void);
static int gcore_memory_sections (bfd *);
/* Function: gcore_command
Generate a core file from the inferior process. */
static void
gcore_command (char *args, int from_tty)
{
struct cleanup *old_chain;
char *corefilename, corefilename_buffer[40];
asection *note_sec = NULL;
2002-01-03 Michael Snyder <msnyder@redhat.com> Implement a "generate-core-file" command in gdb, save target state. * gcore.c: New file. Implement new command 'generate-core-file'. Save a corefile image of the current state of the inferior. * linux-proc.c: Add linux-specific code for saving corefiles. * target.h (struct target_ops): Add new target vectors for saving corefiles; to_find_memory_regions and to_make_corefile_notes. (target_find_memory_regions): New macro. (target_make_corefile_notes): New macro. * target.c (update_current_target): Inherit new target methods. (dummy_find_memory_regions): New place-holder method. (dummy_make_corefile_notes): New place-holder method. (init_dummy_target): Initialize new dummy target vectors. * exec.c (exec_set_find_memory_regions): New function. Allow the exec_ops vector for memory regions to be taken over. (exec_make_note_section): New function, target vector method. * defs.h (exec_set_find_memory_regions): Export prototype. * procfs.c (proc_find_memory_regions): New function, corefile method. (procfs_make_note_section): New function, corefile method. (init_procfs_ops): Set new target vector pointers. (find_memory_regions_callback): New function. (procfs_do_thread_registers): New function. (procfs_corefile_thread_callback): New function. * sol-thread.c (sol_find_memory_regions): New function. (sol_make_note_section): New function. (init_sol_thread_ops): Initialize new target vectors. * inftarg.c (inftarg_set_find_memory_regions): New function. Allow to_find_memory_regions vector to be taken over. (inftarg_set_make_corefile_notes): New function. Allow to_make_corefile_notes vector to be taken over. * thread-db.c (thread_db_new_objfile): Don't activate thread-db interface layer if not target_has_execution (may be a corefile). * config/i386/linux.mh: Add gcore.o to NATDEPFILES. * config/sparc/sun4sol2.mh: Ditto. * config/alpha/alpha-linux.mh: Ditto. * config/arm/linux.mh: Ditto. * config/i386/x86-64linux.mh: Ditto. * config/ia64/linux.mh: Ditto. * config/m68k/linux.mh: Ditto. * config/mips/linux.mh: Ditto. * config/powerpc/linux.mh: Ditto. * config/sparc/linux.mh: Ditto.
2002-01-09 01:37:02 +01:00
bfd *obfd;
void *note_data = NULL;
int note_size = 0;
/* No use generating a corefile without a target process. */
if (!(target_has_execution))
noprocess ();
if (args && *args)
corefilename = args;
else
{
/* Default corefile name is "core.PID". */
sprintf (corefilename_buffer, "core.%d", PIDGET (inferior_ptid));
corefilename = corefilename_buffer;
}
if (info_verbose)
fprintf_filtered (gdb_stdout,
"Opening corefile '%s' for output.\n", corefilename);
/* Open the output file. */
if (!(obfd = bfd_openw (corefilename, NULL /*default_gcore_target ()*/)))
{
error ("Failed to open '%s' for output.", corefilename);
}
/* Need a cleanup that will close the file (FIXME: delete it?). */
old_chain = make_cleanup_bfd_close (obfd);
bfd_set_format (obfd, bfd_core);
bfd_set_arch_mach (obfd, default_gcore_arch (), default_gcore_mach ());
/* An external target method must build the notes section. */
note_data = (char *) target_make_corefile_notes (obfd, &note_size);
/* Create the note section. */
if (note_data != NULL && note_size != 0)
{
if ((note_sec = bfd_make_section_anyway (obfd, "note0")) == NULL)
error ("Failed to create 'note' section for corefile: %s",
bfd_errmsg (bfd_get_error ()));
bfd_set_section_vma (obfd, note_sec, 0);
bfd_set_section_flags (obfd, note_sec,
SEC_HAS_CONTENTS | SEC_READONLY | SEC_ALLOC);
bfd_set_section_alignment (obfd, note_sec, 0);
bfd_set_section_size (obfd, note_sec, note_size);
}
/* Now create the memory/load sections. */
if (gcore_memory_sections (obfd) == 0)
error ("gcore: failed to get corefile memory sections from target.");
/* Write out the contents of the note section. */
if (note_data != NULL && note_size != 0)
{
if (!bfd_set_section_contents (obfd, note_sec, note_data, 0, note_size))
{
warning ("writing note section (%s)",
bfd_errmsg (bfd_get_error ()));
}
}
/* Succeeded. */
fprintf_filtered (gdb_stdout,
"Saved corefile %s\n", corefilename);
/* Clean-ups will close the output file and free malloc memory. */
do_cleanups (old_chain);
return;
}
static unsigned long
default_gcore_mach (void)
{
#ifdef TARGET_ARCHITECTURE
const struct bfd_arch_info * bfdarch = TARGET_ARCHITECTURE;
if (bfdarch != NULL)
return bfdarch->mach;
#endif
if (exec_bfd == NULL)
error ("Can't find default bfd machine type (need execfile).");
return bfd_get_mach (exec_bfd);
}
static enum bfd_architecture
default_gcore_arch (void)
{
#ifdef TARGET_ARCHITECTURE
const struct bfd_arch_info * bfdarch = TARGET_ARCHITECTURE;
if (bfdarch != NULL)
return bfdarch->arch;
#endif
if (exec_bfd == NULL)
error ("Can't find bfd architecture for corefile (need execfile).");
return bfd_get_arch (exec_bfd);
}
static char *
default_gcore_target (void)
{
/* FIXME -- this may only work for ELF targets. */
if (exec_bfd == NULL)
error ("Can't find default bfd target for corefile (need execfile).");
return bfd_get_target (exec_bfd);
}
/*
* Default method for stack segment (preemptable by target).
*/
static int (*override_derive_stack_segment) (bfd_vma *, bfd_vma *);
extern void
preempt_derive_stack_segment (int (*override_func) (bfd_vma *, bfd_vma *))
{
override_derive_stack_segment = override_func;
}
/* Function: default_derive_stack_segment
Derive a reasonable stack segment by unwinding the target stack.
Returns 0 for failure, 1 for success. */
static int
default_derive_stack_segment (bfd_vma *bottom, bfd_vma *top)
{
bfd_vma tmp_vma;
struct frame_info *fi, *tmp_fi;
if (bottom == NULL || top == NULL)
return 0; /* Paranoia. */
if (!target_has_stack || !target_has_registers)
return 0; /* Can't succeed without stack and registers. */
if ((fi = get_current_frame ()) == NULL)
return 0; /* Can't succeed without current frame. */
/* Save frame pointer of TOS frame. */
*top = fi->frame;
/* If current stack pointer is more "inner", use that instead. */
if (INNER_THAN (read_sp (), *top))
*top = read_sp ();
/* Find prev-most frame. */
while ((tmp_fi = get_prev_frame (fi)) != NULL)
fi = tmp_fi;
/* Save frame pointer of prev-most frame. */
*bottom = fi->frame;
/* Now canonicalize their order, so that 'bottom' is a lower address
(as opposed to a lower stack frame). */
if (*bottom > *top)
{
tmp_vma = *top;
*top = *bottom;
*bottom = tmp_vma;
}
return 1; /* success */
}
static int
derive_stack_segment (bfd_vma *bottom, bfd_vma *top)
{
if (override_derive_stack_segment)
return override_derive_stack_segment (bottom, top);
else
return default_derive_stack_segment (bottom, top);
}
/*
* Default method for heap segment (preemptable by target).
*/
static int (*override_derive_heap_segment) (bfd *, bfd_vma *, bfd_vma *);
extern void
preempt_derive_heap_segment (int (*override_func) (bfd *,
bfd_vma *, bfd_vma *))
{
override_derive_heap_segment = override_func;
}
/* Function: default_derive_heap_segment
Derive a reasonable heap segment by looking at sbrk and
the static data sections.
Returns 0 for failure, 1 for success. */
static int
default_derive_heap_segment (bfd *abfd, bfd_vma *bottom, bfd_vma *top)
{
bfd_vma top_of_data_memory = 0;
bfd_vma top_of_heap = 0;
bfd_size_type sec_size;
struct value *zero, *sbrk;
bfd_vma sec_vaddr;
asection *sec;
if (bottom == NULL || top == NULL)
return 0; /* Paranoia. */
if (!target_has_execution)
return 0; /* This function depends on being able
to call a function in the inferior. */
/* Assumption: link map is arranged as follows (low to high addresses):
text sections
data sections (including bss)
heap
*/
for (sec = abfd->sections; sec; sec = sec->next)
{
if (bfd_get_section_flags (abfd, sec) & SEC_DATA ||
strcmp (".bss", bfd_get_section_name (abfd, sec)) == 0)
{
sec_vaddr = bfd_get_section_vma (abfd, sec);
sec_size = bfd_get_section_size_before_reloc (sec);
if (sec_vaddr + sec_size > top_of_data_memory)
top_of_data_memory = sec_vaddr + sec_size;
}
}
/* Now get the top-of-heap by calling sbrk in the inferior. */
if ((sbrk = find_function_in_inferior ("sbrk")) == NULL)
return 0;
if ((zero = value_from_longest (builtin_type_int, (LONGEST) 0)) == NULL)
return 0;
if ((sbrk = call_function_by_hand (sbrk, 1, &zero)) == NULL)
return 0;
top_of_heap = value_as_long (sbrk);
/* Return results. */
if (top_of_heap > top_of_data_memory)
{
*bottom = top_of_data_memory;
*top = top_of_heap;
return 1; /* success */
}
else
return 0; /* No additional heap space needs to be saved. */
}
static int
derive_heap_segment (bfd *abfd, bfd_vma *bottom, bfd_vma *top)
{
if (override_derive_heap_segment)
return override_derive_heap_segment (abfd, bottom, top);
else
return default_derive_heap_segment (abfd, bottom, top);
}
/* ARGSUSED */
static void
make_output_phdrs (bfd *obfd, asection *osec, void *ignored)
{
int p_flags = 0;
int p_type;
/* FIXME: these constants may only be applicable for ELF. */
if (strncmp (osec->name, "load", 4) == 0)
p_type = PT_LOAD;
else
p_type = PT_NOTE;
p_flags |= PF_R; /* Segment is readable. */
if (!(bfd_get_section_flags (obfd, osec) & SEC_READONLY))
p_flags |= PF_W; /* Segment is writable. */
if (bfd_get_section_flags (obfd, osec) & SEC_CODE)
p_flags |= PF_X; /* Segment is executable. */
bfd_record_phdr (obfd, p_type, 1, p_flags, 0, 0,
0, 0, 1, &osec);
}
static asection *
make_mem_sec (bfd *obfd,
bfd_vma addr,
bfd_size_type size,
unsigned int flags,
unsigned int alignment)
{
asection *osec;
if ((osec = bfd_make_section_anyway (obfd, "load")) == NULL)
{
warning ("Couldn't make gcore segment: %s",
bfd_errmsg (bfd_get_error ()));
return NULL;
}
if (info_verbose)
{
fprintf_filtered (gdb_stdout,
"Save segment, %ld bytes at 0x%s\n",
size, paddr_nz (addr));
}
bfd_set_section_size (obfd, osec, size);
bfd_set_section_vma (obfd, osec, addr);
osec->lma = 0; /* FIXME: there should be a macro for this! */
bfd_set_section_alignment (obfd, osec, alignment);
bfd_set_section_flags (obfd, osec,
flags | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS);
return osec;
}
static int
gcore_create_callback (CORE_ADDR vaddr,
unsigned long size,
int read, int write, int exec,
void *data)
{
flagword flags = 0;
if (write == 0)
{
flags |= SEC_READONLY;
/* Set size == zero for readonly sections. */
size = 0;
}
if (exec)
{
flags |= SEC_CODE;
}
else
{
flags |= SEC_DATA;
}
return ((make_mem_sec ((bfd *) data, vaddr, size, flags, 0)) == NULL);
}
static int
objfile_find_memory_regions (int (*func) (CORE_ADDR,
unsigned long,
int, int, int,
void *),
void *obfd)
{
/* Use objfile data to create memory sections. */
struct objfile *objfile;
struct obj_section *objsec;
bfd_vma temp_bottom, temp_top;
/* Call callback function for each objfile section. */
ALL_OBJSECTIONS (objfile, objsec)
{
bfd *ibfd = objfile->obfd;
asection *isec = objsec->the_bfd_section;
flagword flags = bfd_get_section_flags (ibfd, isec);
int ret;
if ((flags & SEC_ALLOC) || (flags & SEC_LOAD))
{
int size = bfd_section_size (ibfd, isec);
int ret;
if ((ret = (*func) (objsec->addr,
bfd_section_size (ibfd, isec),
1, /* All sections will be readable. */
(flags & SEC_READONLY) == 0, /* writable */
(flags & SEC_CODE) != 0, /* executable */
obfd)) != 0)
return ret;
}
}
/* Make a stack segment. */
if (derive_stack_segment (&temp_bottom, &temp_top))
(*func) (temp_bottom,
temp_top - temp_bottom,
1, /* Stack section will be readable */
1, /* Stack section will be writable */
0, /* Stack section will not be executable */
obfd);
/* Make a heap segment. */
if (derive_heap_segment (exec_bfd, &temp_bottom, &temp_top))
(*func) (temp_bottom,
temp_top - temp_bottom,
1, /* Heap section will be readable */
1, /* Heap section will be writable */
0, /* Heap section will not be executable */
obfd);
return 0;
}
static void
gcore_copy_callback (bfd *obfd, asection *osec, void *ignored)
{
bfd_size_type size = bfd_section_size (obfd, osec);
struct cleanup *old_chain = NULL;
void *memhunk;
if (size == 0)
return; /* Read-only sections are marked as zero-size.
We don't have to copy their contents. */
if (strncmp ("load", bfd_get_section_name (obfd, osec), 4) != 0)
return; /* Only interested in "load" sections. */
if ((memhunk = xmalloc (size)) == NULL)
error ("Not enough memory to create corefile.");
old_chain = make_cleanup (xfree, memhunk);
if (target_read_memory (bfd_section_vma (obfd, osec),
memhunk, size) != 0)
warning ("Memory read failed for corefile section, %ld bytes at 0x%s\n",
(long) size, paddr (bfd_section_vma (obfd, osec)));
if (!bfd_set_section_contents (obfd, osec, memhunk, 0, size))
warning ("Failed to write corefile contents (%s).",
bfd_errmsg (bfd_get_error ()));
do_cleanups (old_chain); /* frees the xmalloc buffer */
}
static int
gcore_memory_sections (bfd *obfd)
{
if (target_find_memory_regions (gcore_create_callback, obfd) != 0)
return 0; /* FIXME error return/msg? */
/* Record phdrs for section-to-segment mapping. */
bfd_map_over_sections (obfd, make_output_phdrs, NULL);
/* Copy memory region contents. */
bfd_map_over_sections (obfd, gcore_copy_callback, NULL);
return 1; /* success */
}
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);
}