#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) #define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
struct ihex_binrec { struct ihex_binrec *next; /* not part of the real data structure */
uint32_t addr;
uint16_t len;
uint8_t data[];
};
/** * nybble/hex are little helpers to parse hexadecimal numbers to a byte value
**/ static uint8_t nybble(const uint8_t n)
{ if (n >= '0' && n <= '9') return n - '0'; elseif (n >= 'A' && n <= 'F') return n - ('A' - 10); elseif (n >= 'a' && n <= 'f') return n - ('a' - 10); return 0;
}
staticint usage(void)
{
fprintf(stderr, "ihex2fw: Convert ihex files into binary " "representation for use by Linux kernel\n");
fprintf(stderr, "usage: ihex2fw [] \n");
fprintf(stderr, " -w: wide records (16-bit length)\n");
fprintf(stderr, " -s: sort records by address\n");
fprintf(stderr, " -j: include records for CS:IP/EIP address\n"); return 1;
}
int main(int argc, char **argv)
{ int infd, outfd; struct stat st;
uint8_t *data; int opt;
if (!strcmp(argv[optind], "-"))
infd = 0; else
infd = open(argv[optind], O_RDONLY); if (infd == -1) {
fprintf(stderr, "Failed to open source file: %s",
strerror(errno)); return usage();
} if (fstat(infd, &st)) {
perror("stat"); return 1;
}
data = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, infd, 0); if (data == MAP_FAILED) {
perror("mmap"); return 1;
}
if (!strcmp(argv[optind+1], "-"))
outfd = 1; else
outfd = open(argv[optind+1], O_TRUNC|O_CREAT|O_WRONLY, 0644); if (outfd == -1) {
fprintf(stderr, "Failed to open destination file: %s",
strerror(errno)); return usage();
} if (process_ihex(data, st.st_size)) return 1;
return output_records(outfd);
}
staticint process_ihex(uint8_t *data, ssize_t size)
{ struct ihex_binrec *record;
size_t record_size;
uint32_t offset = 0;
uint32_t data32;
uint8_t type, crc = 0, crcbyte = 0; int i, j; int line = 1; int len;
i = 0;
next_record: /* search for the start of record character */ while (i < size) { if (data[i] == '\n') line++; if (data[i++] == ':') break;
}
/* Minimum record length would be about 10 characters */ if (i + 10 > size) {
fprintf(stderr, "Can't find valid record at line %d\n", line); return -EINVAL;
}
len = hex(data + i, &crc); i += 2; if (wide_records) {
len <<= 8;
len += hex(data + i, &crc); i += 2;
}
record_size = ALIGN(sizeof(*record) + len, 4);
record = malloc(record_size); if (!record) {
fprintf(stderr, "out of memory for records\n"); return -ENOMEM;
}
memset(record, 0, record_size);
record->len = len;
/* now check if we have enough data to read everything */ if (i + 8 + (record->len * 2) > size) {
fprintf(stderr, "Not enough data to read complete record at line %d\n",
line); return -EINVAL;
}
record->addr = hex(data + i, &crc) << 8; i += 2;
record->addr |= hex(data + i, &crc); i += 2;
type = hex(data + i, &crc); i += 2;
for (j = 0; j < record->len; j++, i += 2)
record->data[j] = hex(data + i, &crc);
/* check CRC */
crcbyte = hex(data + i, &crc); i += 2; if (crc != 0) {
fprintf(stderr, "CRC failure at line %d: got 0x%X, expected 0x%X\n",
line, crcbyte, (unsignedchar)(crcbyte-crc)); return -EINVAL;
}
/* Done reading the record */ switch (type) { case 0: /* old style EOF record? */ if (!record->len) break;
case 1: /* End-Of-File Record */ if (record->addr || record->len) {
fprintf(stderr, "Bad EOF record (type 01) format at line %d",
line); return -EINVAL;
} break;
case 2: /* Extended Segment Address Record (HEX86) */ case 4: /* Extended Linear Address Record (HEX386) */ if (record->addr || record->len != 2) {
fprintf(stderr, "Bad HEX86/HEX386 record (type %02X) at line %d\n",
type, line); return -EINVAL;
}
/* We shouldn't really be using the offset for HEX86 because
* the wraparound case is specified quite differently. */
offset = record->data[0] << 8 | record->data[1];
offset <<= (type == 2 ? 4 : 16); goto next_record;
case 3: /* Start Segment Address Record */ case 5: /* Start Linear Address Record */ if (record->addr || record->len != 4) {
fprintf(stderr, "Bad Start Address record (type %02X) at line %d\n",
type, line); return -EINVAL;
}
/* These records contain the CS/IP or EIP where execution
* starts. If requested output this as a record. */ if (include_jump)
file_record(record); goto next_record;
default:
fprintf(stderr, "Unknown record (type %02X)\n", type); return -EINVAL;
}
while (p) {
uint16_t writelen = ALIGN(ihex_binrec_size(p), 4);
p->addr = htonl(p->addr);
p->len = htons(p->len); if (write(outfd, &p->addr, writelen) != writelen) return 1;
p = p->next;
} /* EOF record is zero length, since we don't bother to represent
the type field in the binary version */ if (write(outfd, zeroes, 6) != 6) return 1; return 0;
}
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