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	printf(".section \".rodata\",\"a\",@progbits\n");
64	printf(".globl input_len\n");
65	printf("input_len:\n\t.long %lu\n", ilen);
66	printf(".globl output_len\n");
67	printf("output_len:\n\t.long %lu\n", (unsigned long)olen);
68
69	retval = 0;
70bail:
71	if (f)
72		fclose(f);
73	return retval;
74}
75