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, format: "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(filename: argv[1], modes: "r");
34 if (!f) {
35 perror(s: argv[1]);
36 goto bail;
37 }
38
39
40 if (fseek(stream: f, off: -4L, SEEK_END)) {
41 perror(s: argv[1]);
42 }
43
44 if (fread(ptr: &olen, size: sizeof(olen), n: 1, stream: f) != 1) {
45 perror(s: argv[1]);
46 goto bail;
47 }
48
49 ilen = ftell(stream: f);
50 olen = get_unaligned_le32(p: &olen);
51
52 printf(format: ".section \".rodata..compressed\",\"a\",@progbits\n");
53 printf(format: ".globl z_input_len\n");
54 printf(format: "z_input_len = %lu\n", ilen);
55 printf(format: ".globl z_output_len\n");
56 printf(format: "z_output_len = %lu\n", (unsigned long)olen);
57
58 printf(format: ".globl input_data, input_data_end\n");
59 printf(format: "input_data:\n");
60 printf(format: ".incbin \"%s\"\n", argv[1]);
61 printf(format: "input_data_end:\n");
62
63 printf(format: ".section \".rodata\",\"a\",@progbits\n");
64 printf(format: ".globl input_len\n");
65 printf(format: "input_len:\n\t.long %lu\n", ilen);
66 printf(format: ".globl output_len\n");
67 printf(format: "output_len:\n\t.long %lu\n", (unsigned long)olen);
68
69 retval = 0;
70bail:
71 if (f)
72 fclose(stream: f);
73 return retval;
74}
75

source code of linux/arch/x86/boot/compressed/mkpiggy.c