113 lines
2.1 KiB
C
113 lines
2.1 KiB
C
/* This file is part of the coreboot project. */
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/* SPDX-License-Identifier: GPL-2.0-only */
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static void usage(const char *s)
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{
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printf("%s <rom file>\n", s);
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exit(1);
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}
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static void FseekEnd(FILE *fp, long o)
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{
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if (fseek(fp, o, SEEK_END) != 0) {
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puts("fseek() error!\n");
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exit(1);
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}
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}
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void dump_fw(FILE *dst, FILE *src, long offset)
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{
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static unsigned char buf[65536];
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if (offset > 0)
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offset -= 0x1000000;
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printf("Dumping firmware at -0x%lx...", -offset);
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FseekEnd(src, offset);
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unsigned short len;
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unsigned short cksum;
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unsigned short _cksum = 0;
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fread(&len, 2, 1, src);
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fread(&cksum, 2, 1, src);
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fread(buf, len, 1, src);
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for (size_t i = 0; i < len; i++)
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_cksum += buf[i];
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if (_cksum == cksum) {
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puts("checksum ok");
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} else {
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puts("checksum fail");
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exit(1);
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}
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fwrite(&len, 2, 1, dst);
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fwrite(&cksum, 2, 1, dst);
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fwrite(buf, len, 1, dst);
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}
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int main(int argc, char *argv[])
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{
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if (argc != 2)
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usage(argv[0]);
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FILE *fp = fopen(argv[1], "rb");
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if (fp == NULL) {
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puts("Error opening file!");
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exit(1);
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}
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char *basename = strrchr(argv[1], '/');
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if (basename == NULL)
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basename = argv[1];
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else
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basename = basename + 1;
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int len = strlen(basename);
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char fn1[len + 5], fn2[len + 5];
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strcpy(fn1, basename);
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strcpy(fn2, basename);
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strcat(fn1, ".fw1");
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strcat(fn2, ".fw2");
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FILE *fw1 = fopen(fn1, "wb");
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FILE *fw2 = fopen(fn2, "wb");
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long romsz;
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FseekEnd(fp, -1);
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romsz = ftell(fp) + 1;
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printf("size of %s: 0x%lx\n", argv[1], romsz);
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if (romsz & 0xff) {
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puts("The ROM size must be multiple of 0x100");
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exit(1);
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}
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/* read offset of fw1 and fw2 */
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unsigned char offs[8];
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FseekEnd(fp, -0x100);
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fread(offs, 8, 1, fp);
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assert(offs[0] + offs[2] == 0xff);
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assert(offs[1] + offs[3] == 0xff);
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assert(offs[4] + offs[6] == 0xff);
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assert(offs[5] + offs[7] == 0xff);
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long offw1 = (offs[0] << 16) | (offs[1] << 8);
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long offw2 = (offs[4] << 16) | (offs[5] << 8);
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dump_fw(fw1, fp, offw1);
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dump_fw(fw2, fp, offw2);
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fclose(fp);
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fclose(fw1);
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fclose(fw2);
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return 0;
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}
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