forked from Imagelibrary/binutils-gdb
New files for DWARF debugging format support, ELF object file support, SVR4
/proc (process file system) support, Amiga UNIX target and host defines, SVR4 target and host defines, and m68k hosts defines.
This commit is contained in:
Fred Fish
208
gdb/elfread.c
Normal file
208
gdb/elfread.c
Normal file
@@ -0,0 +1,208 @@
|
||||
/* Read ELF (Executable and Linking Format) object files for GDB.
|
||||
Copyright (C) 1991 Free Software Foundation, Inc.
|
||||
Written by Fred Fish at Cygnus Support.
|
||||
|
||||
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||||
|
||||
/************************************************************************
|
||||
* *
|
||||
* NOTICE *
|
||||
* *
|
||||
* This file is still under construction. When it is complete, this *
|
||||
* notice will be removed. Until then, direct any questions or changes *
|
||||
* to Fred Fish at Cygnus Support (fnf@cygint) *
|
||||
* *
|
||||
* FIXME Still needs support for shared libraries. *
|
||||
* FIXME Still needs support for core files. *
|
||||
* FIXME The ".debug" and ".line" section names are hardwired. *
|
||||
* FIXME Still needs support ELF symbol tables (as distinct *
|
||||
* from DWARF support). Can use them to build the misc *
|
||||
* function vector at least. This is fairly trivial once *
|
||||
* bfd is extended to handle ELF symbol tables. *
|
||||
* *
|
||||
************************************************************************/
|
||||
|
||||
#include <stdio.h>
|
||||
|
||||
#include "defs.h"
|
||||
#include "param.h"
|
||||
#include "elf-common.h"
|
||||
#include "elf-external.h"
|
||||
#include "elf-internal.h"
|
||||
#include "bfd.h"
|
||||
#include "symfile.h"
|
||||
#include "symtab.h"
|
||||
#include "ansidecl.h"
|
||||
|
||||
extern int EXFUN(strcmp, (CONST char *a, CONST char *b));
|
||||
#define STREQ(a,b) (strcmp((a),(b))==0)
|
||||
|
||||
struct elfinfo {
|
||||
unsigned int dboffset; /* Offset to dwarf debug section */
|
||||
unsigned int dbsize; /* Size of dwarf debug section */
|
||||
unsigned int lnoffset; /* Offset to dwarf line number section */
|
||||
unsigned int lnsize; /* Size of dwarf line number section */
|
||||
};
|
||||
|
||||
/* FIXME - crude hack to resolve undefined global. This function is
|
||||
part of support for corefiles, which is not yet implemented. */
|
||||
|
||||
unsigned int
|
||||
DEFUN(register_addr, (regno, blockend),
|
||||
int regno AND
|
||||
int blockend)
|
||||
{
|
||||
error ("Fetching registers from corefiles unimplemented.");
|
||||
}
|
||||
|
||||
/* We are called once per section from elf_symfile_read. We
|
||||
need to examine each section we are passed, check to see
|
||||
if it is something we are interested in processing, and
|
||||
if so, stash away some access information for the section.
|
||||
|
||||
For now we recognize the dwarf debug information sections and
|
||||
line number sections from matching their section names. The
|
||||
ELF definition is no real help here since it has no direct
|
||||
knowledge of DWARF (by design, so any debugging format can be
|
||||
used).
|
||||
|
||||
FIXME: The section names should not be hardwired strings. */
|
||||
|
||||
static void
|
||||
DEFUN(elf_locate_sections, (abfd, sectp, ei),
|
||||
bfd *abfd AND
|
||||
asection *sectp AND
|
||||
struct elfinfo *ei)
|
||||
{
|
||||
if (STREQ (sectp -> name, ".debug"))
|
||||
{
|
||||
ei -> dboffset = sectp -> filepos;
|
||||
ei -> dbsize = sectp -> size;
|
||||
}
|
||||
else if (STREQ (sectp -> name, ".line"))
|
||||
{
|
||||
ei -> lnoffset = sectp -> filepos;
|
||||
ei -> lnsize = sectp -> size;
|
||||
}
|
||||
}
|
||||
|
||||
/* Scan and build partial symbols for a symbol file.
|
||||
We have been initialized by a call to elf_symfile_init, which
|
||||
currently does nothing.
|
||||
|
||||
ADDR is the address relative to which the symbols in it are (e.g.
|
||||
the base address of the text segment).
|
||||
|
||||
MAINLINE is true if we are reading the main symbol
|
||||
table (as opposed to a shared lib or dynamically loaded file).
|
||||
|
||||
This function only does the minimum work necessary for letting the
|
||||
user "name" things symbolically; it does not read the entire symtab.
|
||||
Instead, it reads the external and static symbols and puts them in partial
|
||||
symbol tables. When more extensive information is requested of a
|
||||
file, the corresponding partial symbol table is mutated into a full
|
||||
fledged symbol table by going back and reading the symbols
|
||||
for real. The function dwarf_psymtab_to_symtab() is the function that
|
||||
does this for DWARF symbols. */
|
||||
|
||||
static void
|
||||
DEFUN(elf_symfile_read, (sf, addr, mainline),
|
||||
struct sym_fns *sf AND
|
||||
CORE_ADDR addr AND
|
||||
int mainline)
|
||||
{
|
||||
bfd *abfd = sf -> sym_bfd;
|
||||
struct elfinfo ei;
|
||||
|
||||
bfd_map_over_sections (abfd, elf_locate_sections, &ei);
|
||||
if (ei.dboffset && ei.lnoffset)
|
||||
{
|
||||
addr = 0; /* FIXME: force address base to zero for now */
|
||||
dwarf_build_psymtabs (fileno ((FILE *)(abfd -> iostream)),
|
||||
bfd_get_filename (abfd),
|
||||
addr, mainline,
|
||||
ei.dboffset, ei.dbsize,
|
||||
ei.lnoffset, ei.lnsize);
|
||||
}
|
||||
if (!partial_symtab_list)
|
||||
{
|
||||
wrap_here ("");
|
||||
printf_filtered ("(no debugging symbols found)...");
|
||||
wrap_here ("");
|
||||
}
|
||||
}
|
||||
|
||||
/* Initialize anything that needs initializing when a completely new symbol
|
||||
file is specified (not just adding some symbols from another file, e.g. a
|
||||
shared library).
|
||||
|
||||
For now at least, we have nothing in particular to do, so this function is
|
||||
just a stub. */
|
||||
|
||||
static void
|
||||
DEFUN_VOID (elf_new_init)
|
||||
{
|
||||
}
|
||||
|
||||
/* ELF specific initialization routine for reading symbols.
|
||||
|
||||
It is passed a pointer to a struct sym_fns which contains, among other
|
||||
things, the BFD for the file whose symbols are being read, and a slot for
|
||||
a pointer to "private data" which we can fill with goodies.
|
||||
|
||||
For now at least, we have nothing in particular to do, so this function is
|
||||
just a stub. */
|
||||
|
||||
static void
|
||||
DEFUN(elf_symfile_init, (sf),
|
||||
struct sym_fns *sf)
|
||||
{
|
||||
}
|
||||
|
||||
|
||||
/* Register that we are able to handle ELF object file formats and DWARF
|
||||
debugging formats.
|
||||
|
||||
Unlike other object file formats, where the debugging information format
|
||||
is implied by the object file format, the ELF object file format and the
|
||||
DWARF debugging information format are two distinct, and potentially
|
||||
separate entities. I.E. it is perfectly possible to have ELF objects
|
||||
with debugging formats other than DWARF. And it is conceivable that the
|
||||
DWARF debugging format might be used with another object file format,
|
||||
like COFF, by simply using COFF's custom section feature.
|
||||
|
||||
GDB, and to a lesser extent BFD, should support the notion of separate
|
||||
object file formats and debugging information formats. For now, we just
|
||||
use "elf" in the same sense as "a.out" or "coff", to imply both the ELF
|
||||
object file format and the DWARF debugging format. */
|
||||
|
||||
static struct sym_fns elf_sym_fns = {
|
||||
"elf", /* sym_name: name or name prefix of BFD target type */
|
||||
3, /* sym_namelen: number of significant sym_name chars */
|
||||
elf_new_init, /* sym_new_init: init anything gbl to entire symtab */
|
||||
elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */
|
||||
elf_symfile_read, /* sym_read: read a symbol file into symtab */
|
||||
NULL, /* sym_bfd: accessor for symbol file being read */
|
||||
NULL, /* sym_private: sym_init & sym_read shared info */
|
||||
NULL /* next: pointer to next struct sym_fns */
|
||||
};
|
||||
|
||||
void
|
||||
DEFUN_VOID (_initialize_elfread)
|
||||
{
|
||||
add_symtab_fns (&elf_sym_fns);
|
||||
}
|
||||
Reference in New Issue
Block a user