LXR linux/arch/x86/boot/compressed/mkpiggy.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/* ----------------------------------------------------------------------- *
   3 *
   4 *  Copyright (C) 2009 Intel Corporation. All rights reserved.
   5 *
   6 *  H. Peter Anvin <hpa@linux.intel.com>
   7 *
   8 * -----------------------------------------------------------------------
   9 *
  10 * Outputs a small assembly wrapper with the appropriate symbols defined.
  11 */
  12
  13#include <stdlib.h>
  14#include <stdio.h>
  15#include <string.h>
  16#include <inttypes.h>
  17#include <tools/le_byteshift.h>
  18
  19int main(int argc, char *argv[])
  20{
  21        uint32_t olen;
  22        long ilen;
  23        FILE *f = NULL;
  24        int retval = 1;
  25
  26        if (argc < 2) {
  27                fprintf(stderr, "Usage: %s compressed_file\n", argv[0]);
  28                goto bail;
  29        }
  30
  31        /* Get the information for the compressed kernel image first */
  32
  33        f = fopen(argv[1], "r");
  34        if (!f) {
  35                perror(argv[1]);
  36                goto bail;
  37        }
  38
  39
  40        if (fseek(f, -4L, SEEK_END)) {
  41                perror(argv[1]);
  42        }
  43
  44        if (fread(&olen, sizeof(olen), 1, f) != 1) {
  45                perror(argv[1]);
  46                goto bail;
  47        }
  48
  49        ilen = ftell(f);
  50        olen = get_unaligned_le32(&olen);
  51
  52        printf(".section \".rodata..compressed\",\"a\",@progbits\n");
  53        printf(".globl z_input_len\n");
  54        printf("z_input_len = %lu\n", ilen);
  55        printf(".globl z_output_len\n");
  56        printf("z_output_len = %lu\n", (unsigned long)olen);
  57
  58        printf(".globl input_data, input_data_end\n");
  59        printf("input_data:\n");
  60        printf(".incbin \"%s\"\n", argv[1]);
  61        printf("input_data_end:\n");
  62
  63        retval = 0;
  64bail:
  65        if (f)
  66                fclose(f);
  67        return retval;
  68}
  69