613 lines
14 KiB
C
613 lines
14 KiB
C
/* libbfd.c -- random BFD support routines, only used internally.
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Copyright (C) 1990-1991 Free Software Foundation, Inc.
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Written by Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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/*
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SECTION
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libbfd
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DESCRIPTION
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This file contains various routines which are used within BFD.
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They are not intended for export, but are documented here for
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completeness.
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*/
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boolean
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DEFUN(_bfd_dummy_new_section_hook,(ignore, ignore_newsect),
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bfd *ignore AND
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asection *ignore_newsect)
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{
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return true;
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}
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boolean
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DEFUN(bfd_false ,(ignore),
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bfd *ignore)
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{
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return false;
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}
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boolean
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DEFUN(bfd_true,(ignore),
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bfd *ignore)
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{
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return true;
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}
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PTR
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DEFUN(bfd_nullvoidptr,(ignore),
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bfd *ignore)
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{
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return (PTR)NULL;
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}
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int
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DEFUN(bfd_0,(ignore),
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bfd *ignore)
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{
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return 0;
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}
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unsigned int
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DEFUN(bfd_0u,(ignore),
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bfd *ignore)
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{
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return 0;
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}
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void
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DEFUN(bfd_void,(ignore),
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bfd *ignore)
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{
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}
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boolean
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DEFUN(_bfd_dummy_core_file_matches_executable_p,(ignore_core_bfd, ignore_exec_bfd),
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bfd *ignore_core_bfd AND
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bfd *ignore_exec_bfd)
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{
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bfd_error = invalid_operation;
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return false;
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}
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/* of course you can't initialize a function to be the same as another, grr */
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char *
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DEFUN(_bfd_dummy_core_file_failing_command,(ignore_abfd),
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bfd *ignore_abfd)
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{
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return (char *)NULL;
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}
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int
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DEFUN(_bfd_dummy_core_file_failing_signal,(ignore_abfd),
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bfd *ignore_abfd)
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{
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return 0;
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}
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bfd_target *
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DEFUN(_bfd_dummy_target,(ignore_abfd),
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bfd *ignore_abfd)
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{
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return 0;
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}
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/** zalloc -- allocate and clear storage */
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#ifndef zalloc
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char *
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DEFUN(zalloc,(size),
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bfd_size_type size)
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{
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char *ptr = (char *) malloc ((int)size);
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if ((ptr != NULL) && (size != 0))
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memset(ptr,0, size);
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return ptr;
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}
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#endif
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/*
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INTERNAL_FUNCTION
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bfd_xmalloc
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SYNOPSIS
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PTR bfd_xmalloc( bfd_size_type size);
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DESCRIPTION
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Like malloc, but exit if no more memory.
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*/
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/** There is major inconsistency in how running out of memory is handled.
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Some routines return a NULL, and set bfd_error to no_memory.
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However, obstack routines can't do this ... */
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DEFUN(PTR bfd_xmalloc,(size),
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bfd_size_type size)
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{
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static CONST char no_memory_message[] = "Virtual memory exhausted!\n";
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PTR ptr;
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if (size == 0) size = 1;
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ptr = (PTR)malloc(size);
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if (!ptr)
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{
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write (2, no_memory_message, sizeof(no_memory_message)-1);
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exit (-1);
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}
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return ptr;
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}
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/* Some IO code */
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/* Note that archive entries don't have streams; they share their parent's.
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This allows someone to play with the iostream behind BFD's back.
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Also, note that the origin pointer points to the beginning of a file's
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contents (0 for non-archive elements). For archive entries this is the
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first octet in the file, NOT the beginning of the archive header. */
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static
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int DEFUN(real_read,(where, a,b, file),
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PTR where AND
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int a AND
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int b AND
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FILE *file)
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{
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return fread(where, a,b,file);
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}
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bfd_size_type
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DEFUN(bfd_read,(ptr, size, nitems, abfd),
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PTR ptr AND
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bfd_size_type size AND
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bfd_size_type nitems AND
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bfd *abfd)
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{
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return (bfd_size_type)real_read (ptr, 1, (int)(size*nitems), bfd_cache_lookup(abfd));
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}
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bfd_size_type
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DEFUN(bfd_write,(ptr, size, nitems, abfd),
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CONST PTR ptr AND
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bfd_size_type size AND
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bfd_size_type nitems AND
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bfd *abfd)
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{
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return fwrite (ptr, 1, (int)(size*nitems), bfd_cache_lookup(abfd));
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}
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/*
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INTERNAL_FUNCTION
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bfd_write_bigendian_4byte_int
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SYNOPSIS
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void bfd_write_bigendian_4byte_int(bfd *abfd, int i);
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DESCRIPTION
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Writes a 4 byte integer to the outputing bfd, in big endian
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mode regardless of what else is going on. This is usefull in
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archives.
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*/
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void
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DEFUN(bfd_write_bigendian_4byte_int,(abfd, i),
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bfd *abfd AND
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int i)
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{
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bfd_byte buffer[4];
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_do_putb32(i, buffer);
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bfd_write((PTR)buffer, 4, 1, abfd);
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}
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int
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DEFUN(bfd_seek,(abfd, position, direction),
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bfd * CONST abfd AND
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CONST file_ptr position AND
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CONST int direction)
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{
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/* For the time being, a BFD may not seek to it's end. The
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problem is that we don't easily have a way to recognize
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the end of an element in an archive. */
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BFD_ASSERT(direction == SEEK_SET
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|| direction == SEEK_CUR);
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if (direction == SEEK_SET && abfd->my_archive != NULL)
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{
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/* This is a set within an archive, so we need to
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add the base of the object within the archive */
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return(fseek(bfd_cache_lookup(abfd),
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position + abfd->origin,
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direction));
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}
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else
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{
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return(fseek(bfd_cache_lookup(abfd), position, direction));
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}
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}
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long
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DEFUN(bfd_tell,(abfd),
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bfd *abfd)
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{
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file_ptr ptr;
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ptr = ftell (bfd_cache_lookup(abfd));
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if (abfd->my_archive)
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ptr -= abfd->origin;
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return ptr;
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}
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/** Make a string table */
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/*>bfd.h<
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Add string to table pointed to by table, at location starting with free_ptr.
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resizes the table if necessary (if it's NULL, creates it, ignoring
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table_length). Updates free_ptr, table, table_length */
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boolean
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DEFUN(bfd_add_to_string_table,(table, new_string, table_length, free_ptr),
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char **table AND
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char *new_string AND
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unsigned int *table_length AND
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char **free_ptr)
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{
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size_t string_length = strlen (new_string) + 1; /* include null here */
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char *base = *table;
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size_t space_length = *table_length;
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unsigned int offset = (base ? *free_ptr - base : 0);
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if (base == NULL) {
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/* Avoid a useless regrow if we can (but of course we still
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take it next time */
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space_length = (string_length < DEFAULT_STRING_SPACE_SIZE ?
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DEFAULT_STRING_SPACE_SIZE : string_length+1);
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base = zalloc (space_length);
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if (base == NULL) {
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bfd_error = no_memory;
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return false;
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}
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}
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if ((size_t)(offset + string_length) >= space_length) {
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/* Make sure we will have enough space */
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while ((size_t)(offset + string_length) >= space_length)
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space_length += space_length/2; /* grow by 50% */
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base = (char *) realloc (base, space_length);
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if (base == NULL) {
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bfd_error = no_memory;
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return false;
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}
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}
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memcpy (base + offset, new_string, string_length);
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*table = base;
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*table_length = space_length;
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*free_ptr = base + offset + string_length;
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return true;
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}
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/** The do-it-yourself (byte) sex-change kit */
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/* The middle letter e.g. get<b>short indicates Big or Little endian
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target machine. It doesn't matter what the byte order of the host
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machine is; these routines work for either. */
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/* FIXME: Should these take a count argument?
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Answer (gnu@cygnus.com): No, but perhaps they should be inline
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functions in swap.h #ifdef __GNUC__.
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Gprof them later and find out. */
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/*
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FUNCTION
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bfd_put_size
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FUNCTION
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bfd_get_size
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DESCRIPTION
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These macros as used for reading and writing raw data in
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sections; each access (except for bytes) is vectored through
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the target format of the BFD and mangled accordingly. The
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mangling performs any necessary endian translations and
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removes alignment restrictions.
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.#define bfd_put_8(abfd, val, ptr) \
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. (*((char *)ptr) = (char)val)
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.#define bfd_get_8(abfd, ptr) \
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. (*((char *)ptr))
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.#define bfd_put_16(abfd, val, ptr) \
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. BFD_SEND(abfd, bfd_putx16, (val,ptr))
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.#define bfd_get_16(abfd, ptr) \
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. BFD_SEND(abfd, bfd_getx16, (ptr))
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.#define bfd_put_32(abfd, val, ptr) \
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. BFD_SEND(abfd, bfd_putx32, (val,ptr))
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.#define bfd_get_32(abfd, ptr) \
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. BFD_SEND(abfd, bfd_getx32, (ptr))
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.#define bfd_put_64(abfd, val, ptr) \
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. BFD_SEND(abfd, bfd_putx64, (val, ptr))
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.#define bfd_get_64(abfd, ptr) \
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. BFD_SEND(abfd, bfd_getx64, (ptr))
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*/
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/*
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FUNCTION
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bfd_h_put_size
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FUNCTION
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bfd_h_get_size
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DESCRIPTION
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These macros have the same function as their <<bfd_get_x>>
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bretherin, except that they are used for removing information
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for the header records of object files. Believe it or not,
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some object files keep their header records in big endian
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order, and their data in little endan order.
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.#define bfd_h_put_8(abfd, val, ptr) \
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. (*((char *)ptr) = (char)val)
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.#define bfd_h_get_8(abfd, ptr) \
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. (*((char *)ptr))
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.#define bfd_h_put_16(abfd, val, ptr) \
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. BFD_SEND(abfd, bfd_h_putx16,(val,ptr))
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.#define bfd_h_get_16(abfd, ptr) \
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. BFD_SEND(abfd, bfd_h_getx16,(ptr))
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.#define bfd_h_put_32(abfd, val, ptr) \
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. BFD_SEND(abfd, bfd_h_putx32,(val,ptr))
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.#define bfd_h_get_32(abfd, ptr) \
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. BFD_SEND(abfd, bfd_h_getx32,(ptr))
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.#define bfd_h_put_64(abfd, val, ptr) \
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. BFD_SEND(abfd, bfd_h_putx64,(val, ptr))
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.#define bfd_h_get_64(abfd, ptr) \
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. BFD_SEND(abfd, bfd_h_getx64,(ptr))
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*/
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bfd_vma
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DEFUN(_do_getb16,(addr),
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register bfd_byte *addr)
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{
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return (addr[0] << 8) | addr[1];
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}
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bfd_vma
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DEFUN(_do_getl16,(addr),
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register bfd_byte *addr)
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{
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return (addr[1] << 8) | addr[0];
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}
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void
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DEFUN(_do_putb16,(data, addr),
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bfd_vma data AND
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register bfd_byte *addr)
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{
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addr[0] = (bfd_byte)(data >> 8);
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addr[1] = (bfd_byte )data;
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}
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void
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DEFUN(_do_putl16,(data, addr),
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bfd_vma data AND
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register bfd_byte *addr)
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{
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addr[0] = (bfd_byte )data;
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addr[1] = (bfd_byte)(data >> 8);
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}
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bfd_vma
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DEFUN(_do_getb32,(addr),
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register bfd_byte *addr)
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{
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return ((((addr[0] << 8) | addr[1]) << 8) | addr[2]) << 8 | addr[3];
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}
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bfd_vma
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_do_getl32 (addr)
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register bfd_byte *addr;
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{
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return ((((addr[3] << 8) | addr[2]) << 8) | addr[1]) << 8 | addr[0];
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}
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bfd_vma
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DEFUN(_do_getb64,(addr),
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register bfd_byte *addr)
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{
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#ifdef HOST_64_BIT
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bfd_64_type low, high;
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high= ((((((((addr[0]) << 8) |
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addr[1]) << 8) |
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addr[2]) << 8) |
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addr[3]) );
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low = ((((((((addr[4]) << 8) |
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addr[5]) << 8) |
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addr[6]) << 8) |
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addr[7]));
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return high << 32 | low;
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#else
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BFD_FAIL();
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return 0;
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#endif
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}
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bfd_vma
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DEFUN(_do_getl64,(addr),
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register bfd_byte *addr)
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{
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#ifdef HOST_64_BIT
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bfd_64_type low, high;
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high= (((((((addr[7] << 8) |
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addr[6]) << 8) |
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addr[5]) << 8) |
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addr[4]));
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low = (((((((addr[3] << 8) |
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addr[2]) << 8) |
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addr[1]) << 8) |
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addr[0]) );
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return high << 32 | low;
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#else
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BFD_FAIL();
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return 0;
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#endif
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}
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void
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DEFUN(_do_putb32,(data, addr),
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bfd_vma data AND
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register bfd_byte *addr)
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{
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addr[0] = (bfd_byte)(data >> 24);
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addr[1] = (bfd_byte)(data >> 16);
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addr[2] = (bfd_byte)(data >> 8);
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addr[3] = (bfd_byte)data;
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}
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void
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DEFUN(_do_putl32,(data, addr),
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bfd_vma data AND
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register bfd_byte *addr)
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{
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addr[0] = (bfd_byte)data;
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addr[1] = (bfd_byte)(data >> 8);
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addr[2] = (bfd_byte)(data >> 16);
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addr[3] = (bfd_byte)(data >> 24);
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}
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void
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DEFUN(_do_putb64,(data, addr),
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bfd_vma data AND
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register bfd_byte *addr)
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{
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#ifdef HOST_64_BIT
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addr[0] = (bfd_byte)(data >> (7*8));
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addr[1] = (bfd_byte)(data >> (6*8));
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addr[2] = (bfd_byte)(data >> (5*8));
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addr[3] = (bfd_byte)(data >> (4*8));
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addr[4] = (bfd_byte)(data >> (3*8));
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addr[5] = (bfd_byte)(data >> (2*8));
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addr[6] = (bfd_byte)(data >> (1*8));
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addr[7] = (bfd_byte)(data >> (0*8));
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#else
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BFD_FAIL();
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#endif
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}
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void
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DEFUN(_do_putl64,(data, addr),
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bfd_vma data AND
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register bfd_byte *addr)
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{
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#ifdef HOST_64_BIT
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addr[7] = (bfd_byte)(data >> (7*8));
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addr[6] = (bfd_byte)(data >> (6*8));
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addr[5] = (bfd_byte)(data >> (5*8));
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addr[4] = (bfd_byte)(data >> (4*8));
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addr[3] = (bfd_byte)(data >> (3*8));
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addr[2] = (bfd_byte)(data >> (2*8));
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addr[1] = (bfd_byte)(data >> (1*8));
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addr[0] = (bfd_byte)(data >> (0*8));
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#else
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BFD_FAIL();
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#endif
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}
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||
|
||
/* Default implementation */
|
||
|
||
boolean
|
||
DEFUN(bfd_generic_get_section_contents, (abfd, section, location, offset, count),
|
||
bfd *abfd AND
|
||
sec_ptr section AND
|
||
PTR location AND
|
||
file_ptr offset AND
|
||
bfd_size_type count)
|
||
{
|
||
if (count == 0)
|
||
return true;
|
||
if ((bfd_size_type)(offset+count) > section->_raw_size
|
||
|| bfd_seek(abfd, (file_ptr)(section->filepos + offset), SEEK_SET) == -1
|
||
|| bfd_read(location, (bfd_size_type)1, count, abfd) != count)
|
||
return (false); /* on error */
|
||
return (true);
|
||
}
|
||
|
||
/* This generic function can only be used in implementations where creating
|
||
NEW sections is disallowed. It is useful in patching existing sections
|
||
in read-write files, though. See other set_section_contents functions
|
||
to see why it doesn't work for new sections. */
|
||
boolean
|
||
DEFUN(bfd_generic_set_section_contents, (abfd, section, location, offset, count),
|
||
bfd *abfd AND
|
||
sec_ptr section AND
|
||
PTR location AND
|
||
file_ptr offset AND
|
||
bfd_size_type count)
|
||
{
|
||
if (count == 0)
|
||
return true;
|
||
if ((bfd_size_type)(offset+count) > bfd_get_section_size_after_reloc(section)
|
||
|| bfd_seek(abfd, (file_ptr)(section->filepos + offset), SEEK_SET) == -1
|
||
|| bfd_write(location, (bfd_size_type)1, count, abfd) != count)
|
||
return (false); /* on error */
|
||
return (true);
|
||
}
|
||
|
||
/*
|
||
INTERNAL_FUNCTION
|
||
bfd_log2
|
||
|
||
DESCRIPTION
|
||
Return the log base 2 of the value supplied, rounded up. eg an
|
||
arg of 1025 would return 11.
|
||
|
||
SYNOPSIS
|
||
bfd_vma bfd_log2(bfd_vma x);
|
||
*/
|
||
|
||
bfd_vma bfd_log2(x)
|
||
bfd_vma x;
|
||
{
|
||
bfd_vma result = 0;
|
||
while ( (bfd_vma)(1<< result) < x)
|
||
result++;
|
||
return result;
|
||
}
|