437 lines
12 KiB
C
437 lines
12 KiB
C
/* BFD backend for s-record objects.
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Copyright (C) 1990-1991 Free Software Foundation, Inc.
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Written by Steve Chamberlain of Cygnus Support <steve@cygnus.com>.
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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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/* S-records cannot hold anything but addresses and data, so that's all
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that we implement.
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The only interesting thing is that s-records may come out of order and
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there is no header, so an initial scan is required to discover the
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minimum and maximum addresses used to create the vma and size of the
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only section we create. We arbitrarily call this section ".text".
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When bfd_get_section_contents is called the file is read again, and
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this time the data is placed into a bfd_alloc'd area.
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Any number of sections may be created for output, we just output them
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in the order provided to bfd_set_section_contents. */
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#include <sysdep.h>
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#include "bfd.h"
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#include "libbfd.h"
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static char digs[] = "0123456789ABCDEF";
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/* Macros for converting between hex and binary */
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#define NIBBLE(x) (((x) >= '0' && (x) <= '9') ? ((x) - '0') : ((x) - 'A' + 10))
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#define HEX(buffer) ((NIBBLE((buffer)->high) <<4) + NIBBLE((buffer)->low))
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#define TOHEX(d,x) \
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((d)->low = digs[(x) & 0xf], (d)->high = digs[((x)>>4)&0xf], (x))
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#define ISHEX(x) (((x) >= '0' && (x) <= '9') || ((x) >= 'A' && (x) <= 'F'))
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typedef struct {
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char high;
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char low;
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} byte_as_two_char_type;
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/* The maximum number of bytes on a line is FF */
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#define MAXCHUNK 0xff
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/* The number of bytes we fit onto a line on output */
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#define CHUNK 16
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/* The shape of an s-record .. */
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typedef struct
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{
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char S;
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char type;
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byte_as_two_char_type size;
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union {
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struct {
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byte_as_two_char_type address[4];
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byte_as_two_char_type data[MAXCHUNK];
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/* If there isn't MAXCHUNK bytes of data then the checksum will
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appear earlier */
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byte_as_two_char_type checksum;
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char nl;
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} type_3;
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struct {
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byte_as_two_char_type address[4];
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byte_as_two_char_type data[MAXCHUNK];
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byte_as_two_char_type checksum;
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char nl;
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} type_6;
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struct {
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byte_as_two_char_type address[3];
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byte_as_two_char_type data[MAXCHUNK];
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byte_as_two_char_type checksum;
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char nl;
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} type_2;
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struct {
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byte_as_two_char_type address[2];
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byte_as_two_char_type data[MAXCHUNK];
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byte_as_two_char_type checksum;
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char nl;
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} type_1;
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byte_as_two_char_type data[MAXCHUNK];
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} u;
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} srec_type;
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#define enda(x) (x->vma + x->size)
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/*
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called once per input s-record, used to work out vma and size of data.
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*/
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static bfd_vma low,high;
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static void
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size_srec(abfd, section, address, raw, length)
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bfd *abfd;
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asection *section;
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bfd_vma address;
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byte_as_two_char_type *raw;
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unsigned int length;
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{
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if (address < low)
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low = address;
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if (address + length > high)
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high = address + length;
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}
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/*
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called once per input s-record, copies data from input into bfd_alloc'd area
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*/
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static void
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fillup(abfd, section, address, raw, length)
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bfd *abfd;
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asection *section;
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bfd_vma address;
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byte_as_two_char_type *raw;
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unsigned int length;
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{
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unsigned int i;
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bfd_byte *dst = (bfd_byte *)(section->used_by_bfd) + address - section->vma;
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for (i = 0; i < length; i++) {
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*dst = HEX(raw);
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dst++;
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raw++;
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}
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}
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/* Pass over an s-record file, calling one of the above functions on each
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record. */
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static void
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pass_over(abfd, func, section)
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bfd *abfd;
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void (*func)();
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asection *section;
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{
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unsigned int bytes_on_line;
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boolean eof = false;
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bfd_vma address;
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/* To the front of the file */
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bfd_seek(abfd, (file_ptr)0, SEEK_SET);
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while (eof == false)
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{
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srec_type buffer;
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/* Find first 'S' */
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eof = bfd_read(&buffer.S, 1, 1, abfd) != 1;
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while (buffer.S != 'S' && !eof) {
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eof = bfd_read(&buffer.S, 1, 1, abfd) != 1;
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}
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if (eof) break;
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bfd_read(&buffer.type, 1, 3, abfd);
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if (!ISHEX (buffer.size.high) || !ISHEX (buffer.size.low))
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break;
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bytes_on_line = HEX(&buffer.size);
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if (bytes_on_line > MAXCHUNK/2)
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break;
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bfd_read((PTR)buffer.u.data, 1 , bytes_on_line * 2, abfd);
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switch (buffer.type) {
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case '6':
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/* Prologue - ignore */
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break;
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case '3':
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address = (HEX(buffer.u.type_3.address+0) << 24)
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+ (HEX(buffer.u.type_3.address+1) << 16)
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+ (HEX(buffer.u.type_3.address+2) << 8)
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+ (HEX(buffer.u.type_3.address+3));
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func(abfd,section, address, buffer.u.type_3.data, bytes_on_line -1);
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break;
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case '2':
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address = (HEX(buffer.u.type_2.address+0) << 16)
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+ (HEX(buffer.u.type_2.address+1) << 8)
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+ (HEX(buffer.u.type_2.address+2));
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func(abfd,section, address, buffer.u.type_2.data, bytes_on_line -1);
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break;
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case '1':
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address = (HEX(buffer.u.type_1.address+0) << 8)
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+ (HEX(buffer.u.type_1.address+1));
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func(abfd, section, address, buffer.u.type_1.data, bytes_on_line -1);
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break;
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default:
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goto end_of_file;
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}
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}
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end_of_file: ;
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}
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bfd_target *
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srec_object_p (abfd)
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bfd *abfd;
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{
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char b[4];
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asection *section;
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bfd_seek(abfd, (file_ptr)0, SEEK_SET);
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bfd_read(b, 1, 4, abfd);
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if (b[0] != 'S' || !ISHEX(b[1]) || !ISHEX(b[2]) || !ISHEX(b[3]))
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return (bfd_target*) NULL;
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/* We create one section called .text for all the contents,
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and allocate enough room for the entire file. */
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section = bfd_make_section(abfd, ".text");
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section->size = 0;
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section->vma = 0xffffffff;
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low = 0xffffffff;
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high = 0;
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pass_over(abfd, size_srec, section);
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section->size = high - low;
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section->vma = low;
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return abfd->xvec;
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}
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static boolean
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srec_get_section_contents (abfd, section, location, offset, count)
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bfd *abfd;
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sec_ptr section;
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void *location;
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file_ptr offset;
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unsigned int count;
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{
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if (section->used_by_bfd == (PTR)NULL) {
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section->used_by_bfd = (PTR)bfd_alloc (abfd, section->size);
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pass_over(abfd, fillup, section);
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}
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(void) memcpy((PTR)location, (PTR)((char *)(section->used_by_bfd) + offset), count);
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return true;
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}
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boolean
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srec_set_arch_mach (abfd, arch, machine)
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bfd *abfd;
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enum bfd_architecture arch;
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unsigned long machine;
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{
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abfd->obj_arch = arch;
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abfd->obj_machine = machine;
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return true;
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}
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boolean
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srec_set_section_contents (abfd, section, location, offset, bytes_to_do)
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bfd *abfd;
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sec_ptr section;
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unsigned char *location;
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file_ptr offset;
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int bytes_to_do;
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{
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bfd_vma address;
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int bytes_written;
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int type;
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unsigned int i;
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srec_type buffer;
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bytes_written = 0;
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if (section->vma <= 0xffff)
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type = 1;
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else if (section->vma <= 0xffffff)
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type = 2;
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else
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type = 3;
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buffer.S = 'S';
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buffer.type = '0' + type;
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while (bytes_written < bytes_to_do) {
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unsigned int size;
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unsigned int check_sum;
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byte_as_two_char_type *data;
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unsigned int bytes_this_chunk = bytes_to_do - bytes_written;
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if (bytes_this_chunk > CHUNK) {
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bytes_this_chunk = CHUNK;
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}
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address = section->vma + offset + bytes_written;
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switch (type) {
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case 3:
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check_sum = TOHEX(buffer.u.type_3.address, address >> 24);
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check_sum += TOHEX(buffer.u.type_3.address+1, address >> 16);
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check_sum += TOHEX(buffer.u.type_3.address+2, address >> 8);
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check_sum += TOHEX(buffer.u.type_3.address+3, address >> 0);
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size = bytes_this_chunk + 5;
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data = buffer.u.type_3.data;
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break;
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case 2:
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check_sum = TOHEX(buffer.u.type_3.address, address >> 16);
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check_sum += TOHEX(buffer.u.type_3.address+1, address >> 8);
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check_sum += TOHEX(buffer.u.type_3.address+2, address >> 0);
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size = bytes_this_chunk + 4;
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data = buffer.u.type_2.data;
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break;
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case 1:
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check_sum = TOHEX(buffer.u.type_3.address+0, address >> 8);
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check_sum += TOHEX(buffer.u.type_3.address+1, address >> 0);
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size = bytes_this_chunk + 3;
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data = buffer.u.type_1.data;
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break;
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}
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for (i = 0; i < bytes_this_chunk; i++) {
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check_sum += TOHEX(data, (location[i]));
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data++;
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}
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check_sum += TOHEX(&(buffer.size), size );
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(void) TOHEX(data, ~check_sum);
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data++;
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* ( (char *)(data)) = '\n';
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bfd_write((PTR)&buffer, 1, (char *)data - (char *)&buffer + 1 , abfd);
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bytes_written += bytes_this_chunk;
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location += bytes_this_chunk;
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}
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return true;
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}
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boolean
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srec_write_object_contents (abfd)
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bfd *abfd;
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{
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bfd_write("S9030000FC\n", 1,11,abfd);
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return true;
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}
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static int
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DEFUN(srec_sizeof_headers,(abfd, exec),
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bfd *abfd AND
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boolean exec)
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{
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return 0;
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}
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static asymbol *
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DEFUN(srec_make_empty_symbol, (abfd),
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bfd*abfd)
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{
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asymbol *new= (asymbol *)bfd_zalloc (abfd, sizeof (asymbol));
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new->the_bfd = abfd;
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return new;
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}
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#define FOO PROTO
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#define srec_new_section_hook (FOO(boolean, (*), (bfd *, asection *)))bfd_true
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#define srec_get_symtab_upper_bound (PROTO(unsigned int, (*),(bfd *)))bfd_false
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#define srec_get_symtab (FOO(unsigned int, (*), (bfd *, asymbol **)))bfd_0
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#define srec_get_reloc_upper_bound (FOO(unsigned int, (*),(bfd*, asection *)))bfd_false
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#define srec_canonicalize_reloc (FOO(unsigned int, (*),(bfd*,asection *, arelent **, asymbol **))) bfd_0
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#define srec_print_symbol (FOO(void,(*),(bfd *, PTR, asymbol *, bfd_print_symbol_enum_type))) bfd_void
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#define srec_openr_next_archived_file (FOO(bfd *, (*), (bfd*,bfd*))) bfd_nullvoidptr
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#define srec_find_nearest_line (FOO(boolean, (*),(bfd*,asection*,asymbol**,bfd_vma, CONST char**, CONST char**, unsigned int *))) bfd_false
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#define srec_generic_stat_arch_elt (FOO(int, (*), (bfd *,struct stat *))) bfd_0
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#define srec_core_file_failing_command (char *(*)())(bfd_nullvoidptr)
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#define srec_core_file_failing_signal (int (*)())bfd_0
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#define srec_core_file_matches_executable_p (FOO(boolean, (*),(bfd*, bfd*)))bfd_false
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#define srec_slurp_armap bfd_true
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#define srec_slurp_extended_name_table bfd_true
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#define srec_truncate_arname (void (*)())bfd_nullvoidptr
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#define srec_write_armap (FOO( boolean, (*),(bfd *, unsigned int, struct orl *, int, int))) bfd_nullvoidptr
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#define srec_get_lineno (struct lineno_cache_entry *(*)())bfd_nullvoidptr
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#define srec_close_and_cleanup bfd_generic_close_and_cleanup
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#define srec_bfd_debug_info_start bfd_void
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#define srec_bfd_debug_info_end bfd_void
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#define srec_bfd_debug_info_accumulate (FOO(void, (*), (bfd *, asection *))) bfd_void
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bfd_target srec_vec =
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{
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"srec", /* name */
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bfd_target_srec_flavour_enum,
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true, /* target byte order */
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true, /* target headers byte order */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
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(SEC_CODE|SEC_DATA|SEC_ROM|SEC_HAS_CONTENTS
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|SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
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' ', /* ar_pad_char */
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16, /* ar_max_namelen */
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1, /* minimum alignment */
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_do_getb64, _do_putb64, _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* data */
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_do_getb64, _do_putb64, _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* hdrs */
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{_bfd_dummy_target,
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srec_object_p, /* bfd_check_format */
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(struct bfd_target *(*)()) bfd_nullvoidptr,
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(struct bfd_target *(*)()) bfd_nullvoidptr,
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},
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{
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bfd_false,
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bfd_true, /* mkobject */
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_bfd_generic_mkarchive,
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bfd_false,
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},
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{ /* bfd_write_contents */
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bfd_false,
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srec_write_object_contents,
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_bfd_write_archive_contents,
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bfd_false,
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},
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JUMP_TABLE(srec)
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};
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