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
  19 int 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;
  64 bail:
  65         if (f)
  66                 fclose(f);
  67         return retval;
  68 }