scripts/ihex2fw.c

   1 /*
   2  * Parser/loader for IHEX formatted data.
   3  *
   4  * Copyright © 2008 David Woodhouse <dwmw2@infradead.org>
   5  * Copyright © 2005 Jan Harkes <jaharkes@cs.cmu.edu>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <stdint.h>
  13 #include <arpa/inet.h>
  14 #include <stdio.h>
  15 #include <errno.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <sys/mman.h>
  19 #include <fcntl.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #include <stdlib.h>
  23 #define _GNU_SOURCE
  24 #include <getopt.h>
  25
  26
  27 struct ihex_binrec {
  28         struct ihex_binrec *next; /* not part of the real data structure */
  29         uint32_t addr;
  30         uint16_t len;
  31         uint8_t data[];
  32 };
  33
  34 /**
  35  * nybble/hex are little helpers to parse hexadecimal numbers to a byte value
  36  **/
  37 static uint8_t nybble(const uint8_t n)
  38 {
  39        if      (n >= '0' && n <= '9') return n - '0';
  40        else if (n >= 'A' && n <= 'F') return n - ('A' - 10);
  41        else if (n >= 'a' && n <= 'f') return n - ('a' - 10);
  42        return 0;
  43 }
  44
  45 static uint8_t hex(const uint8_t *data, uint8_t *crc)
  46 {
  47        uint8_t val = (nybble(data[0]) << 4) | nybble(data[1]);
  48        *crc += val;
  49        return val;
  50 }
  51
  52 static int process_ihex(uint8_t *data, ssize_t size);
  53 static void file_record(struct ihex_binrec *record);
  54 static int output_records(int outfd);
  55
  56 static int sort_records = 0;
  57 static int wide_records = 0;
  58
  59 int usage(void)
  60 {
  61         fprintf(stderr, "ihex2fw: Convert ihex files into binary "
  62                 "representation for use by Linux kernel\n");
  63         fprintf(stderr, "usage: ihex2fw [<options>] <src.HEX> <dst.fw>\n");
  64         fprintf(stderr, "       -w: wide records (16-bit length)\n");
  65         fprintf(stderr, "       -s: sort records by address\n");
  66         return 1;
  67 }
  68
  69 int main(int argc, char **argv)
  70 {
  71         int infd, outfd;
  72         struct stat st;
  73         uint8_t *data;
  74         int opt;
  75
  76         while ((opt = getopt(argc, argv, "ws")) != -1) {
  77                 switch (opt) {
  78                 case 'w':
  79                         wide_records = 1;
  80                         break;
  81                 case 's':
  82                         sort_records = 1;
  83                         break;
  84                 default:
  85                         return usage();
  86                 }
  87         }
  88
  89         if (optind + 2 != argc)
  90                 return usage();
  91
  92         if (!strcmp(argv[optind], "-"))
  93             infd = 0;
  94         else
  95                 infd = open(argv[optind], O_RDONLY);
  96         if (infd == -1) {
  97                 fprintf(stderr, "Failed to open source file: %s",
  98                         strerror(errno));
  99                 return usage();
 100         }
 101         if (fstat(infd, &st)) {
 102                 perror("stat");
 103                 return 1;
 104         }
 105         data = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, infd, 0);
 106         if (data == MAP_FAILED) {
 107                 perror("mmap");
 108                 return 1;
 109         }
 110
 111         if (!strcmp(argv[optind+1], "-"))
 112             outfd = 1;
 113         else
 114                 outfd = open(argv[optind+1], O_TRUNC|O_CREAT|O_WRONLY, 0644);
 115         if (outfd == -1) {
 116                 fprintf(stderr, "Failed to open destination file: %s",
 117                         strerror(errno));
 118                 return usage();
 119         }
 120         if (process_ihex(data, st.st_size))
 121                 return 1;
 122
 123         output_records(outfd);
 124         return 0;
 125 }
 126
 127 static int process_ihex(uint8_t *data, ssize_t size)
 128 {
 129         struct ihex_binrec *record;
 130         uint32_t offset = 0;
 131         uint8_t type, crc = 0, crcbyte = 0;
 132         int i, j;
 133         int line = 1;
 134         int len;
 135
 136         i = 0;
 137 next_record:
 138         /* search for the start of record character */
 139         while (i < size) {
 140                 if (data[i] == '\n') line++;
 141                 if (data[i++] == ':') break;
 142         }
 143
 144         /* Minimum record length would be about 10 characters */
 145         if (i + 10 > size) {
 146                 fprintf(stderr, "Can't find valid record at line %d\n", line);
 147                 return -EINVAL;
 148         }
 149
 150         len = hex(data + i, &crc); i += 2;
 151         if (wide_records) {
 152                 len <<= 8;
 153                 len += hex(data + i, &crc); i += 2;
 154         }
 155         record = malloc((sizeof (*record) + len + 3) & ~3);
 156         if (!record) {
 157                 fprintf(stderr, "out of memory for records\n");
 158                 return -ENOMEM;
 159         }
 160         memset(record, 0, (sizeof(*record) + len + 3) & ~3);
 161         record->len = len;
 162
 163         /* now check if we have enough data to read everything */
 164         if (i + 8 + (record->len * 2) > size) {
 165                 fprintf(stderr, "Not enough data to read complete record at line %d\n",
 166                         line);
 167                 return -EINVAL;
 168         }
 169
 170         record->addr  = hex(data + i, &crc) << 8; i += 2;
 171         record->addr |= hex(data + i, &crc); i += 2;
 172         type = hex(data + i, &crc); i += 2;
 173
 174         for (j = 0; j < record->len; j++, i += 2)
 175                 record->data[j] = hex(data + i, &crc);
 176
 177         /* check CRC */
 178         crcbyte = hex(data + i, &crc); i += 2;
 179         if (crc != 0) {
 180                 fprintf(stderr, "CRC failure at line %d: got 0x%X, expected 0x%X\n",
 181                         line, crcbyte, (unsigned char)(crcbyte-crc));
 182                 return -EINVAL;
 183         }
 184
 185         /* Done reading the record */
 186         switch (type) {
 187         case 0:
 188                 /* old style EOF record? */
 189                 if (!record->len)
 190                         break;
 191
 192                 record->addr += offset;
 193                 file_record(record);
 194                 goto next_record;
 195
 196         case 1: /* End-Of-File Record */
 197                 if (record->addr || record->len) {
 198                         fprintf(stderr, "Bad EOF record (type 01) format at line %d",
 199                                 line);
 200                         return -EINVAL;
 201                 }
 202                 break;
 203
 204         case 2: /* Extended Segment Address Record (HEX86) */
 205         case 4: /* Extended Linear Address Record (HEX386) */
 206                 if (record->addr || record->len != 2) {
 207                         fprintf(stderr, "Bad HEX86/HEX386 record (type %02X) at line %d\n",
 208                                 type, line);
 209                         return -EINVAL;
 210                 }
 211
 212                 /* We shouldn't really be using the offset for HEX86 because
 213                  * the wraparound case is specified quite differently. */
 214                 offset = record->data[0] << 8 | record->data[1];
 215                 offset <<= (type == 2 ? 4 : 16);
 216                 goto next_record;
 217
 218         case 3: /* Start Segment Address Record */
 219         case 5: /* Start Linear Address Record */
 220                 if (record->addr || record->len != 4) {
 221                         fprintf(stderr, "Bad Start Address record (type %02X) at line %d\n",
 222                                 type, line);
 223                         return -EINVAL;
 224                 }
 225
 226                 /* These records contain the CS/IP or EIP where execution
 227                  * starts. Don't really know what to do with them. */
 228                 goto next_record;
 229
 230         default:
 231                 fprintf(stderr, "Unknown record (type %02X)\n", type);
 232                 return -EINVAL;
 233         }
 234
 235         return 0;
 236 }
 237
 238 static struct ihex_binrec *records;
 239
 240 static void file_record(struct ihex_binrec *record)
 241 {
 242         struct ihex_binrec **p = &records;
 243
 244         while ((*p) && (!sort_records || (*p)->addr < record->addr))
 245                 p = &((*p)->next);
 246
 247         record->next = *p;
 248         *p = record;
 249 }
 250
 251 static int output_records(int outfd)
 252 {
 253         unsigned char zeroes[6] = {0, 0, 0, 0, 0, 0};
 254         struct ihex_binrec *p = records;
 255
 256         while (p) {
 257                 uint16_t writelen = (p->len + 9) & ~3;
 258
 259                 p->addr = htonl(p->addr);
 260                 p->len = htons(p->len);
 261                 write(outfd, &p->addr, writelen);
 262                 p = p->next;
 263         }
 264         /* EOF record is zero length, since we don't bother to represent
 265            the type field in the binary version */
 266         write(outfd, zeroes, 6);
 267         return 0;
 268 }