da745b36fd
* ppc-linux-nat.c (store_spe_registers): Eliminate K&R C. * tui/tui-win.c (tui_get_cmd_list): Ditto. * symfile-mem.c (_initialize_symfile_mem): Ditto.
146 lines
4.9 KiB
C
146 lines
4.9 KiB
C
/* Reading symbol files from memory.
|
||
|
||
Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
|
||
2001, 2002, 2003, 2004 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. */
|
||
|
||
/* This file defines functions (and commands to exercise those
|
||
functions) for reading debugging information from object files
|
||
whose images are mapped directly into the inferior's memory. For
|
||
example, the Linux kernel maps a "syscall DSO" into each process's
|
||
address space; this DSO provides kernel-specific code for some
|
||
system calls.
|
||
|
||
At the moment, BFD only has functions for parsing object files from
|
||
memory for the ELF format, even though the general idea isn't
|
||
ELF-specific. This means that BFD only provides the functions GDB
|
||
needs when configured for ELF-based targets. So these functions
|
||
may only be compiled on ELF-based targets.
|
||
|
||
GDB has no idea whether it has been configured for an ELF-based
|
||
target or not: it just tries to handle whatever files it is given.
|
||
But this means there are no preprocessor symbols on which we could
|
||
make these functions' compilation conditional.
|
||
|
||
So, for the time being, we put these functions alone in this file,
|
||
and have .mt files reference them as appropriate. In the future, I
|
||
hope BFD will provide a format-independent bfd_from_remote_memory
|
||
entry point. */
|
||
|
||
|
||
#include "defs.h"
|
||
#include "symtab.h"
|
||
#include "gdbcore.h"
|
||
#include "objfiles.h"
|
||
#include "gdbcmd.h"
|
||
#include "target.h"
|
||
#include "value.h"
|
||
#include "symfile.h"
|
||
|
||
|
||
/* Read inferior memory at ADDR to find the header of a loaded object file
|
||
and read its in-core symbols out of inferior memory. TEMPL is a bfd
|
||
representing the target's format. */
|
||
static struct objfile *
|
||
symbol_file_add_from_memory (struct bfd *templ, CORE_ADDR addr, int from_tty)
|
||
{
|
||
struct objfile *objf;
|
||
struct bfd *nbfd;
|
||
struct bfd_section *sec;
|
||
bfd_vma loadbase;
|
||
struct section_addr_info *sai;
|
||
unsigned int i;
|
||
|
||
if (bfd_get_flavour (templ) != bfd_target_elf_flavour)
|
||
error ("add-symbol-file-from-memory not supported for this target");
|
||
|
||
nbfd = bfd_elf_bfd_from_remote_memory (templ, addr, &loadbase,
|
||
target_read_memory);
|
||
if (nbfd == NULL)
|
||
error ("Failed to read a valid object file image from memory.");
|
||
|
||
nbfd->filename = xstrdup ("shared object read from target memory");
|
||
|
||
if (!bfd_check_format (nbfd, bfd_object))
|
||
{
|
||
/* FIXME: should be checking for errors from bfd_close (for one thing,
|
||
on error it does not free all the storage associated with the
|
||
bfd). */
|
||
bfd_close (nbfd);
|
||
error ("Got object file from memory but can't read symbols: %s.",
|
||
bfd_errmsg (bfd_get_error ()));
|
||
}
|
||
|
||
sai = alloc_section_addr_info (bfd_count_sections (nbfd));
|
||
make_cleanup (xfree, sai);
|
||
i = 0;
|
||
for (sec = nbfd->sections; sec != NULL; sec = sec->next)
|
||
if ((bfd_get_section_flags (nbfd, sec) & (SEC_ALLOC|SEC_LOAD)) != 0)
|
||
{
|
||
sai->other[i].addr = bfd_get_section_vma (nbfd, sec) + loadbase;
|
||
sai->other[i].name = (char *) bfd_get_section_name (nbfd, sec);
|
||
sai->other[i].sectindex = sec->index;
|
||
++i;
|
||
}
|
||
|
||
objf = symbol_file_add_from_bfd (nbfd, from_tty,
|
||
sai, 0, OBJF_SHARED);
|
||
|
||
/* This might change our ideas about frames already looked at. */
|
||
reinit_frame_cache ();
|
||
|
||
return objf;
|
||
}
|
||
|
||
|
||
static void
|
||
add_symbol_file_from_memory_command (char *args, int from_tty)
|
||
{
|
||
CORE_ADDR addr;
|
||
struct bfd *templ;
|
||
|
||
if (args == NULL)
|
||
error ("add-symbol-file-from-memory requires an expression argument");
|
||
|
||
addr = parse_and_eval_address (args);
|
||
|
||
/* We need some representative bfd to know the target we are looking at. */
|
||
if (symfile_objfile != NULL)
|
||
templ = symfile_objfile->obfd;
|
||
else
|
||
templ = exec_bfd;
|
||
if (templ == NULL)
|
||
error ("\
|
||
Must use symbol-file or exec-file before add-symbol-file-from-memory.");
|
||
|
||
symbol_file_add_from_memory (templ, addr, from_tty);
|
||
}
|
||
|
||
|
||
void
|
||
_initialize_symfile_mem (void)
|
||
{
|
||
add_cmd ("add-symbol-file-from-memory", class_files,
|
||
add_symbol_file_from_memory_command,
|
||
"\
|
||
Load the symbols out of memory from a dynamically loaded object file.\n\
|
||
Give an expression for the address of the file's shared object file header.",
|
||
&cmdlist);
|
||
|
||
}
|