boot/compressed/mkpiggy.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /* ----------------------------------------------------------------------- *
0003  *
0004  *  Copyright (C) 2009 Intel Corporation. All rights reserved.
0005  *
0006  *  H. Peter Anvin <hpa@linux.intel.com>
0007  *
0008  * -----------------------------------------------------------------------
0009  *
0010  * Outputs a small assembly wrapper with the appropriate symbols defined.
0011  */
0012
0013 #include <stdlib.h>
0014 #include <stdio.h>
0015 #include <string.h>
0016 #include <inttypes.h>
0017 #include <tools/le_byteshift.h>
0018
0019 int main(int argc, char *argv[])
0020 {
0021     uint32_t olen;
0022     long ilen;
0023     FILE *f = NULL;
0024     int retval = 1;
0025
0026     if (argc < 2) {
0027         fprintf(stderr, "Usage: %s compressed_file\n", argv[0]);
0028         goto bail;
0029     }
0030
0031     /* Get the information for the compressed kernel image first */
0032
0033     f = fopen(argv[1], "r");
0034     if (!f) {
0035         perror(argv[1]);
0036         goto bail;
0037     }
0038
0039
0040     if (fseek(f, -4L, SEEK_END)) {
0041         perror(argv[1]);
0042     }
0043
0044     if (fread(&olen, sizeof(olen), 1, f) != 1) {
0045         perror(argv[1]);
0046         goto bail;
0047     }
0048
0049     ilen = ftell(f);
0050     olen = get_unaligned_le32(&olen);
0051
0052     printf(".section \".rodata..compressed\",\"a\",@progbits\n");
0053     printf(".globl z_input_len\n");
0054     printf("z_input_len = %lu\n", ilen);
0055     printf(".globl z_output_len\n");
0056     printf("z_output_len = %lu\n", (unsigned long)olen);
0057
0058     printf(".globl input_data, input_data_end\n");
0059     printf("input_data:\n");
0060     printf(".incbin \"%s\"\n", argv[1]);
0061     printf("input_data_end:\n");
0062
0063     printf(".section \".rodata\",\"a\",@progbits\n");
0064     printf(".globl input_len\n");
0065     printf("input_len:\n\t.long %lu\n", ilen);
0066     printf(".globl output_len\n");
0067     printf("output_len:\n\t.long %lu\n", (unsigned long)olen);
0068
0069     retval = 0;
0070 bail:
0071     if (f)
0072         fclose(f);
0073     return retval;
0074 }