1/*
 2 * Copyright (C) 2017 Linaro, Ltd. <ard.biesheuvel@linaro.org>
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 *
 8 */
 9
10#include <linux/module.h>
11
12int sym64_rel;
13
14#define SYM64_ABS_VAL		0xffff880000cccccc
15#define SYM32_ABS_VAL		0xf800cccc
16#define SYM16_ABS_VAL		0xf8cc
17
18#define __SET_ABS(name, val)	asm(".globl " #name "; .set "#name ", " #val)
19#define SET_ABS(name, val)	__SET_ABS(name, val)
20
21SET_ABS(sym64_abs, SYM64_ABS_VAL);
22SET_ABS(sym32_abs, SYM32_ABS_VAL);
23SET_ABS(sym16_abs, SYM16_ABS_VAL);
24
25asmlinkage u64 absolute_data64(void);
26asmlinkage u64 absolute_data32(void);
27asmlinkage u64 absolute_data16(void);
28asmlinkage u64 signed_movw(void);
29asmlinkage u64 unsigned_movw(void);
30asmlinkage u64 relative_adrp(void);
31asmlinkage u64 relative_adrp_far(void);
32asmlinkage u64 relative_adr(void);
33asmlinkage u64 relative_data64(void);
34asmlinkage u64 relative_data32(void);
35asmlinkage u64 relative_data16(void);
36
37static struct {
38	char	name[32];
39	u64	(*f)(void);
40	u64	expect;
41} const funcs[] = {
42	{ "R_AARCH64_ABS64",		absolute_data64, UL(SYM64_ABS_VAL) },
43	{ "R_AARCH64_ABS32",		absolute_data32, UL(SYM32_ABS_VAL) },
44	{ "R_AARCH64_ABS16",		absolute_data16, UL(SYM16_ABS_VAL) },
45	{ "R_AARCH64_MOVW_SABS_Gn",	signed_movw, UL(SYM64_ABS_VAL) },
46	{ "R_AARCH64_MOVW_UABS_Gn",	unsigned_movw, UL(SYM64_ABS_VAL) },
47	{ "R_AARCH64_ADR_PREL_PG_HI21",	relative_adrp, (u64)&sym64_rel },
48	{ "R_AARCH64_ADR_PREL_PG_HI21",	relative_adrp_far, (u64)&memstart_addr },
49	{ "R_AARCH64_ADR_PREL_LO21",	relative_adr, (u64)&sym64_rel },
50	{ "R_AARCH64_PREL64",		relative_data64, (u64)&sym64_rel },
51	{ "R_AARCH64_PREL32",		relative_data32, (u64)&sym64_rel },
52	{ "R_AARCH64_PREL16",		relative_data16, (u64)&sym64_rel },
53};
54
55static int reloc_test_init(void)
56{
57	int i;
58
59	pr_info("Relocation test:\n");
60	pr_info("-------------------------------------------------------\n");
61
62	for (i = 0; i < ARRAY_SIZE(funcs); i++) {
63		u64 ret = funcs[i].f();
64
65		pr_info("%-31s 0x%016llx %s\n", funcs[i].name, ret,
66			ret == funcs[i].expect ? "pass" : "fail");
67		if (ret != funcs[i].expect)
68			pr_err("Relocation failed, expected 0x%016llx, not 0x%016llx\n",
69			       funcs[i].expect, ret);
70	}
71	return 0;
72}
73
74static void reloc_test_exit(void)
75{
76}
77
78module_init(reloc_test_init);
79module_exit(reloc_test_exit);
80
81MODULE_LICENSE("GPL v2");