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firmware/ihex2fw.c
6.57 KB
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/* * Parser/loader for IHEX formatted data. * * Copyright © 2008 David Woodhouse <dwmw2@infradead.org> * Copyright © 2005 Jan Harkes <jaharkes@cs.cmu.edu> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <stdint.h> #include <arpa/inet.h> #include <stdio.h> #include <errno.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/mman.h> #include <fcntl.h> #include <string.h> #include <unistd.h> #include <stdlib.h> |
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#define _GNU_SOURCE #include <getopt.h> |
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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'; else if (n >= 'A' && n <= 'F') return n - ('A' - 10); else if (n >= 'a' && n <= 'f') return n - ('a' - 10); return 0; } static uint8_t hex(const uint8_t *data, uint8_t *crc) { uint8_t val = (nybble(data[0]) << 4) | nybble(data[1]); *crc += val; return val; } static int process_ihex(uint8_t *data, ssize_t size); static void file_record(struct ihex_binrec *record); static int output_records(int outfd); 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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{ fprintf(stderr, "ihex2fw: Convert ihex files into binary " "representation for use by Linux kernel "); fprintf(stderr, "usage: ihex2fw [<options>] <src.HEX> <dst.fw> "); fprintf(stderr, " -w: wide records (16-bit length) "); fprintf(stderr, " -s: sort records by address "); |
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fprintf(stderr, " -j: include records for CS:IP/EIP address "); |
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return 1; } |
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int main(int argc, char **argv) { int infd, outfd; struct stat st; 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) { case 'w': wide_records = 1; break; case 's': sort_records = 1; break; |
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case 'j': include_jump = 1; break; |
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return usage(); } |
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} |
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if (optind + 2 != argc) return usage(); if (!strcmp(argv[optind], "-")) |
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infd = 0; else |
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infd = open(argv[optind], O_RDONLY); |
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if (infd == -1) { fprintf(stderr, "Failed to open source file: %s", strerror(errno)); |
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return usage(); |
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} 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; } |
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if (!strcmp(argv[optind+1], "-")) |
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outfd = 1; else |
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outfd = open(argv[optind+1], O_TRUNC|O_CREAT|O_WRONLY, 0644); |
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if (outfd == -1) { fprintf(stderr, "Failed to open destination file: %s", strerror(errno)); |
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return usage(); |
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} if (process_ihex(data, st.st_size)) return 1; |
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return output_records(outfd); |
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} static int process_ihex(uint8_t *data, ssize_t size) { struct ihex_binrec *record; uint32_t offset = 0; |
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uint32_t data32; |
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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] == ' ') 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 ", line); return -EINVAL; } len = hex(data + i, &crc); i += 2; |
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if (wide_records) { len <<= 8; len += hex(data + i, &crc); i += 2; } |
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record = malloc((sizeof (*record) + len + 3) & ~3); if (!record) { fprintf(stderr, "out of memory for records "); return -ENOMEM; } memset(record, 0, (sizeof(*record) + len + 3) & ~3); 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 ", 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 ", line, crcbyte, (unsigned char)(crcbyte-crc)); return -EINVAL; } /* Done reading the record */ switch (type) { case 0: /* old style EOF record? */ if (!record->len) break; record->addr += offset; file_record(record); goto next_record; 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 ", 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 ", type, line); return -EINVAL; } |
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memcpy(&data32, &record->data[0], sizeof(data32)); data32 = htonl(data32); 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. */ if (include_jump) file_record(record); |
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goto next_record; default: fprintf(stderr, "Unknown record (type %02X) ", type); return -EINVAL; } return 0; } static struct ihex_binrec *records; static void file_record(struct ihex_binrec *record) { struct ihex_binrec **p = &records; while ((*p) && (!sort_records || (*p)->addr < record->addr)) p = &((*p)->next); record->next = *p; *p = record; } static int output_records(int outfd) { |
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unsigned char zeroes[6] = {0, 0, 0, 0, 0, 0}; |
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struct ihex_binrec *p = records; while (p) { uint16_t writelen = (p->len + 9) & ~3; p->addr = htonl(p->addr); |
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p->len = htons(p->len); |
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if (write(outfd, &p->addr, writelen) != writelen) return 1; |
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p = p->next; } /* EOF record is zero length, since we don't bother to represent the type field in the binary version */ |
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if (write(outfd, zeroes, 6) != 6) return 1; |
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return 0; } |