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279 lines
6.5 KiB
279 lines
6.5 KiB
/*
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* Parser/loader for IHEX formatted data.
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*
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* Copyright © 2008 David Woodhouse <dwmw2@infradead.org>
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* Copyright © 2005 Jan Harkes <jaharkes@cs.cmu.edu>
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*
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <stdint.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#define _GNU_SOURCE
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#include <getopt.h>
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struct ihex_binrec {
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struct ihex_binrec *next; /* not part of the real data structure */
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uint32_t addr;
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uint16_t len;
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uint8_t data[];
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};
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/**
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* nybble/hex are little helpers to parse hexadecimal numbers to a byte value
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**/
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static uint8_t nybble(const uint8_t n)
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{
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if (n >= '0' && n <= '9') return n - '0';
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else if (n >= 'A' && n <= 'F') return n - ('A' - 10);
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else if (n >= 'a' && n <= 'f') return n - ('a' - 10);
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return 0;
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}
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static uint8_t hex(const uint8_t *data, uint8_t *crc)
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{
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uint8_t val = (nybble(data[0]) << 4) | nybble(data[1]);
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*crc += val;
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return val;
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}
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static int process_ihex(uint8_t *data, ssize_t size);
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static void file_record(struct ihex_binrec *record);
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static int output_records(int outfd);
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static int sort_records = 0;
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static int wide_records = 0;
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static int include_jump = 0;
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static int usage(void)
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{
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fprintf(stderr, "ihex2fw: Convert ihex files into binary "
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"representation for use by Linux kernel\n");
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fprintf(stderr, "usage: ihex2fw [<options>] <src.HEX> <dst.fw>\n");
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fprintf(stderr, " -w: wide records (16-bit length)\n");
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fprintf(stderr, " -s: sort records by address\n");
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fprintf(stderr, " -j: include records for CS:IP/EIP address\n");
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return 1;
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}
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int main(int argc, char **argv)
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{
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int infd, outfd;
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struct stat st;
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uint8_t *data;
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int opt;
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while ((opt = getopt(argc, argv, "wsj")) != -1) {
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switch (opt) {
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case 'w':
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wide_records = 1;
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break;
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case 's':
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sort_records = 1;
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break;
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case 'j':
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include_jump = 1;
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break;
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return usage();
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}
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}
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if (optind + 2 != argc)
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return usage();
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if (!strcmp(argv[optind], "-"))
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infd = 0;
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else
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infd = open(argv[optind], O_RDONLY);
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if (infd == -1) {
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fprintf(stderr, "Failed to open source file: %s",
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strerror(errno));
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return usage();
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}
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if (fstat(infd, &st)) {
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perror("stat");
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return 1;
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}
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data = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, infd, 0);
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if (data == MAP_FAILED) {
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perror("mmap");
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return 1;
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}
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if (!strcmp(argv[optind+1], "-"))
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outfd = 1;
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else
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outfd = open(argv[optind+1], O_TRUNC|O_CREAT|O_WRONLY, 0644);
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if (outfd == -1) {
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fprintf(stderr, "Failed to open destination file: %s",
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strerror(errno));
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return usage();
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}
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if (process_ihex(data, st.st_size))
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return 1;
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output_records(outfd);
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return 0;
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}
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static int process_ihex(uint8_t *data, ssize_t size)
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{
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struct ihex_binrec *record;
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uint32_t offset = 0;
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uint32_t data32;
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uint8_t type, crc = 0, crcbyte = 0;
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int i, j;
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int line = 1;
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int len;
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i = 0;
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next_record:
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/* search for the start of record character */
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while (i < size) {
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if (data[i] == '\n') line++;
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if (data[i++] == ':') break;
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}
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/* Minimum record length would be about 10 characters */
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if (i + 10 > size) {
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fprintf(stderr, "Can't find valid record at line %d\n", line);
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return -EINVAL;
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}
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len = hex(data + i, &crc); i += 2;
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if (wide_records) {
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len <<= 8;
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len += hex(data + i, &crc); i += 2;
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}
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record = malloc((sizeof (*record) + len + 3) & ~3);
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if (!record) {
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fprintf(stderr, "out of memory for records\n");
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return -ENOMEM;
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}
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memset(record, 0, (sizeof(*record) + len + 3) & ~3);
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record->len = len;
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/* now check if we have enough data to read everything */
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if (i + 8 + (record->len * 2) > size) {
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fprintf(stderr, "Not enough data to read complete record at line %d\n",
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line);
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return -EINVAL;
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}
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record->addr = hex(data + i, &crc) << 8; i += 2;
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record->addr |= hex(data + i, &crc); i += 2;
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type = hex(data + i, &crc); i += 2;
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for (j = 0; j < record->len; j++, i += 2)
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record->data[j] = hex(data + i, &crc);
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/* check CRC */
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crcbyte = hex(data + i, &crc); i += 2;
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if (crc != 0) {
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fprintf(stderr, "CRC failure at line %d: got 0x%X, expected 0x%X\n",
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line, crcbyte, (unsigned char)(crcbyte-crc));
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return -EINVAL;
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}
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/* Done reading the record */
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switch (type) {
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case 0:
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/* old style EOF record? */
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if (!record->len)
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break;
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record->addr += offset;
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file_record(record);
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goto next_record;
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case 1: /* End-Of-File Record */
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if (record->addr || record->len) {
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fprintf(stderr, "Bad EOF record (type 01) format at line %d",
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line);
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return -EINVAL;
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}
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break;
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case 2: /* Extended Segment Address Record (HEX86) */
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case 4: /* Extended Linear Address Record (HEX386) */
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if (record->addr || record->len != 2) {
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fprintf(stderr, "Bad HEX86/HEX386 record (type %02X) at line %d\n",
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type, line);
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return -EINVAL;
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}
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/* We shouldn't really be using the offset for HEX86 because
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* the wraparound case is specified quite differently. */
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offset = record->data[0] << 8 | record->data[1];
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offset <<= (type == 2 ? 4 : 16);
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goto next_record;
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case 3: /* Start Segment Address Record */
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case 5: /* Start Linear Address Record */
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if (record->addr || record->len != 4) {
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fprintf(stderr, "Bad Start Address record (type %02X) at line %d\n",
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type, line);
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return -EINVAL;
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}
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memcpy(&data32, &record->data[0], sizeof(data32));
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data32 = htonl(data32);
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memcpy(&record->data[0], &data32, sizeof(data32));
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/* These records contain the CS/IP or EIP where execution
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* starts. If requested output this as a record. */
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if (include_jump)
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file_record(record);
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goto next_record;
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default:
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fprintf(stderr, "Unknown record (type %02X)\n", type);
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return -EINVAL;
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}
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return 0;
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}
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static struct ihex_binrec *records;
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static void file_record(struct ihex_binrec *record)
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{
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struct ihex_binrec **p = &records;
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while ((*p) && (!sort_records || (*p)->addr < record->addr))
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p = &((*p)->next);
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record->next = *p;
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*p = record;
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}
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static int output_records(int outfd)
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{
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unsigned char zeroes[6] = {0, 0, 0, 0, 0, 0};
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struct ihex_binrec *p = records;
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while (p) {
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uint16_t writelen = (p->len + 9) & ~3;
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p->addr = htonl(p->addr);
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p->len = htons(p->len);
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write(outfd, &p->addr, writelen);
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p = p->next;
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}
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/* EOF record is zero length, since we don't bother to represent
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the type field in the binary version */
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write(outfd, zeroes, 6);
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return 0;
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}
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