630 lines
15 KiB
C
630 lines
15 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 <sac@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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/*
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SUBSECTION
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S-record handling
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DESCRIPTION
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S-records cannot hold anything but addresses and data, so
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that's all that we implement.
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The only interesting thing is that s-records may come out of
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order and there is no header, so an initial scan is required
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to discover the minimum and maximum addresses used to create
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the vma and size of the only section we create. We
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arbitrarily call this section ".text".
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When bfd_get_section_contents is called the file is read
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again, and this time the data is placed into a bfd_alloc'd
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area.
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Any number of sections may be created for output, we save them
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up and output them when it's time to close the bfd.
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An s record looks like:
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EXAMPLE
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S<length><type><address><data><checksum>
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DESCRIPTION
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Where
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o length
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is the number of bytes following upto the checksum. Note that
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this is not the number of chars following, since it takes two
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chars to represent a byte.
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o type
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is one of:
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0) header record
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1) two byte address data record
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2) three byte address data record
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3) four byte address data record
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7) four byte address termination record
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8) three byte address termination record
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9) two byte address termination record
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o address
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is the start address of the data following, or in the case of
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a termination record, the start address of the image
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o data
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is the data.
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o checksum
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is the sum of all the raw byte data in the record, from the length
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upwards, modulo 256 and subtracted from 255.
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*/
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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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static char digs[] = "0123456789ABCDEF";
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/* Horrible ascii dependent macros for converting between hex and
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binary */
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#define CHARS_IN_SET 256
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static char hex_value[CHARS_IN_SET];
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#define NOT_HEX 20
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#define NIBBLE(x) hex_value[x]
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#define HEX(buffer) ((NIBBLE((buffer)[0])<<4) + NIBBLE((buffer)[1]))
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#define TOHEX(d,x, ch) \
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d[1] = digs[(x) & 0xf]; \
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d[0] = digs[((x)>>4)&0xf]; ch += (x & 0xff);
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#define ISHEX(x) (hex_value[x] != NOT_HEX)
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static void
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DEFUN_VOID(srec_init)
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{
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unsigned int i;
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static boolean inited = false;
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if (inited == false)
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{
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inited = true;
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for (i = 0; i < CHARS_IN_SET; i++)
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{
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hex_value[i] = NOT_HEX;
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}
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for (i = 0; i < 10; i++)
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{
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hex_value[i + '0'] = i;
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}
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for (i = 0; i < 6; i++)
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{
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hex_value[i + 'a'] = i+10;
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hex_value[i + 'A'] = i+10;
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}
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}
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}
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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 21
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/* We cannot output our srecords as we see them, we have to glue them
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together, this is done in this structure : */
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struct srec_data_list_struct
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{
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unsigned char *data;
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bfd_vma where;
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bfd_size_type size;
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struct srec_data_list_struct *next;
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} ;
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typedef struct srec_data_list_struct srec_data_list_type;
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typedef struct srec_data_struct
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{
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srec_data_list_type *head;
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unsigned int type;
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} tdata_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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DEFUN(size_srec,(abfd, section, address, raw, length),
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bfd *abfd AND
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asection *section AND
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bfd_vma address AND
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bfd_byte *raw AND
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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 -1;
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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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DEFUN(fillup,(abfd, section, address, raw, length),
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bfd *abfd AND
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asection *section AND
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bfd_vma address AND
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bfd_byte *raw AND
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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 =
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(bfd_byte *)(section->used_by_bfd) +
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address - section->vma;
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/* length -1 because we don't read in the checksum */
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for (i = 0; i < length -1 ; i++) {
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*dst = HEX(raw);
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dst++;
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raw+=2;
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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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DEFUN(pass_over,(abfd, func, section),
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bfd *abfd AND
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void (*func)() AND
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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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/* 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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char buffer[MAXCHUNK];
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char *src = buffer;
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char type;
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bfd_vma address = 0;
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/* Find first 'S' */
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eof = (boolean)(bfd_read(src, 1, 1, abfd) != 1);
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while (*src!= 'S' && !eof) {
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eof = (boolean)(bfd_read(src, 1, 1, abfd) != 1);
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}
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if (eof) break;
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src++;
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/* Fetch the type and the length */
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bfd_read(src, 1, 3, abfd);
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type = *src++;
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if (!ISHEX (src[0]) || !ISHEX (src[1]))
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break;
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bytes_on_line = HEX(src);
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if (bytes_on_line > MAXCHUNK/2)
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break;
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src+=2 ;
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bfd_read(src, 1 , bytes_on_line * 2, abfd);
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switch (type) {
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case '0':
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case '5':
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/* Prologue - ignore */
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break;
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case '3':
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address = HEX(src);
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src+=2;
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bytes_on_line--;
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case '2':
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address = HEX(src) | (address<<8) ;
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src+=2;
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bytes_on_line--;
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case '1':
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address = HEX(src) | (address<<8) ;
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src+=2;
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address = HEX(src) | (address<<8) ;
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src+=2;
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bytes_on_line-=2;
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func(abfd,section, address, src, bytes_on_line);
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break;
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default:
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return;
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}
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}
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}
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static bfd_target *
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DEFUN(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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srec_init();
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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->_raw_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->_raw_size = high - low;
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section->vma = low;
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section->flags = SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC;
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return abfd->xvec;
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}
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static boolean
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DEFUN(srec_get_section_contents,(abfd, section, location, offset, count),
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bfd *abfd AND
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asection *section AND
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PTR location AND
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file_ptr offset AND
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bfd_size_type count)
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{
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if (section->used_by_bfd == (PTR)NULL)
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{
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section->used_by_bfd = (PTR)bfd_alloc (abfd, section->_raw_size);
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pass_over(abfd, fillup, section);
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}
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(void) memcpy((PTR)location,
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(PTR)((char *)(section->used_by_bfd) + offset),
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count);
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return true;
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}
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boolean
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DEFUN(srec_set_arch_mach,(abfd, arch, machine),
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bfd *abfd AND
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enum bfd_architecture arch AND
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unsigned long machine)
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{
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return bfd_default_set_arch_mach(abfd, arch, machine);
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}
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/* we have to save up all the Srecords for a splurge before output,
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also remember */
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static boolean
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DEFUN(srec_set_section_contents,(abfd, section, location, offset, bytes_to_do),
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bfd *abfd AND
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sec_ptr section AND
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PTR location AND
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file_ptr offset AND
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bfd_size_type bytes_to_do)
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{
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tdata_type *tdata = abfd->tdata.srec_data;
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srec_data_list_type *entry = (srec_data_list_type *)
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bfd_alloc(abfd, sizeof(srec_data_list_type));
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unsigned char *data = (unsigned char *) bfd_alloc(abfd, bytes_to_do);
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memcpy(data, location, bytes_to_do);
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if ((section->vma + offset + bytes_to_do) <= 0xffff)
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{
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}
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else if ((section->vma + offset + bytes_to_do) <= 0xffffff
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&& tdata->type < 2)
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{
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tdata->type = 2;
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}
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else
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{
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tdata->type = 3;
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}
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entry->data = data;
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entry->where = section->vma + offset;
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entry->size = bytes_to_do;
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entry->next = tdata->head;
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tdata->head = entry;
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return true;
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}
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/* Write a record of type, of the supplied number of bytes. The
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supplied bytes and length don't have a checksum. That's worked out
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here
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*/
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static
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void DEFUN(srec_write_record,(abfd, type, address, data, end),
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bfd *abfd AND
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char type AND
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bfd_vma address AND
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CONST unsigned char *data AND
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CONST unsigned char *end)
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{
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char buffer[MAXCHUNK];
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unsigned int check_sum = 0;
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unsigned CONST char *src = data;
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char *dst =buffer;
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char *length;
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*dst++ = 'S';
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*dst++ = '0' + type;
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length = dst;
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dst+=2; /* leave room for dst*/
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switch (type)
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{
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case 3:
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case 7:
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TOHEX(dst, (address >> 24), check_sum);
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dst+=2;
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case 8:
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case 2:
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TOHEX(dst, (address >> 16), check_sum);
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dst+=2;
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case 9:
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case 1:
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case 0:
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TOHEX(dst, (address >> 8), check_sum);
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dst+=2;
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TOHEX(dst, (address), check_sum);
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dst+=2;
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break;
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}
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for (src = data; src < end; src++)
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{
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TOHEX(dst, *src, check_sum);
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dst+=2;
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}
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/* Fill in the length */
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TOHEX(length, (dst - length)/2, check_sum);
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check_sum &= 0xff;
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check_sum = 255 - check_sum;
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TOHEX(dst, check_sum, check_sum);
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dst+=2;
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*dst ++ = '\n';
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bfd_write((PTR)buffer, 1, dst - buffer , abfd);
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}
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static void
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DEFUN(srec_write_header,(abfd),
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bfd *abfd)
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{
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unsigned char buffer[MAXCHUNK];
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unsigned char *dst = buffer;
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unsigned int i;
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/* I'll put an arbitary 40 char limit on header size */
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for (i = 0; i < 40 && abfd->filename[i]; i++)
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{
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*dst++ = abfd->filename[i];
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}
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srec_write_record(abfd,0, 0, buffer, dst);
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}
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static void
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DEFUN(srec_write_section,(abfd, tdata, list),
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bfd *abfd AND
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tdata_type *tdata AND
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srec_data_list_type *list)
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{
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unsigned int bytes_written = 0;
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unsigned char *location = list->data;
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while (bytes_written < list->size)
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{
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char buffer[MAXCHUNK];
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char *dst = buffer;
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bfd_vma address;
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unsigned int bytes_this_chunk = list->size - bytes_written;
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if (bytes_this_chunk > CHUNK)
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{
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bytes_this_chunk = CHUNK;
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}
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address = list->where + bytes_written;
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srec_write_record(abfd,
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tdata->type,
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address,
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location,
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location + bytes_this_chunk);
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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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}
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static void
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DEFUN(srec_write_terminator,(abfd, tdata),
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bfd *abfd AND
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tdata_type *tdata)
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{
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unsigned char buffer[2];
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srec_write_record(abfd, 10 - tdata->type,
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abfd->start_address, buffer, buffer);
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}
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static boolean
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DEFUN(srec_mkobject, (abfd),
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bfd *abfd)
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{
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tdata_type *tdata = (tdata_type *)bfd_alloc(abfd, sizeof(tdata_type));
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abfd->tdata.srec_data = tdata;
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tdata->type = 1;
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tdata->head = (srec_data_list_type *)NULL;
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return true;
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}
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static boolean
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DEFUN(srec_write_object_contents,(abfd),
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bfd *abfd)
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{
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int bytes_written;
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tdata_type *tdata = abfd->tdata.srec_data;
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srec_data_list_type *list;
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bytes_written = 0;
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srec_write_header(abfd);
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/* Now wander though all the sections provided and output them */
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list = tdata->head;
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while (list != (srec_data_list_type*)NULL)
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{
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srec_write_section(abfd, tdata, list);
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list = list->next;
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}
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srec_write_terminator(abfd, tdata);
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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_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 *, unsigned 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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#define srec_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
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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,
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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,
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_do_putb32, _do_getb16, _do_putb16, /* data */
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_do_getb64, _do_putb64, _do_getb32,
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_do_putb32, _do_getb16, _do_putb16, /* hdrs */
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{
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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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srec_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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