1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2017 Linaro, Ltd. <ard.biesheuvel@linaro.org>
4 */
5
6 #include <linux/module.h>
7
8 int sym64_rel;
9
10 #define SYM64_ABS_VAL 0xffff880000cccccc
11 #define SYM32_ABS_VAL 0xf800cccc
12 #define SYM16_ABS_VAL 0xf8cc
13
14 #define __SET_ABS(name, val) asm(".globl " #name "; .set "#name ", " #val)
15 #define SET_ABS(name, val) __SET_ABS(name, val)
16
17 SET_ABS(sym64_abs, SYM64_ABS_VAL);
18 SET_ABS(sym32_abs, SYM32_ABS_VAL);
19 SET_ABS(sym16_abs, SYM16_ABS_VAL);
20
21 asmlinkage u64 absolute_data64(void);
22 asmlinkage u64 absolute_data32(void);
23 asmlinkage u64 absolute_data16(void);
24 asmlinkage u64 signed_movw(void);
25 asmlinkage u64 unsigned_movw(void);
26 asmlinkage u64 relative_adrp(void);
27 asmlinkage u64 relative_adrp_far(void);
28 asmlinkage u64 relative_adr(void);
29 asmlinkage u64 relative_data64(void);
30 asmlinkage u64 relative_data32(void);
31 asmlinkage u64 relative_data16(void);
32
33 static struct {
34 char name[32];
35 u64 (*f)(void);
36 u64 expect;
37 } const funcs[] = {
38 { "R_AARCH64_ABS64", absolute_data64, UL(SYM64_ABS_VAL) },
39 { "R_AARCH64_ABS32", absolute_data32, UL(SYM32_ABS_VAL) },
40 { "R_AARCH64_ABS16", absolute_data16, UL(SYM16_ABS_VAL) },
41 { "R_AARCH64_MOVW_SABS_Gn", signed_movw, UL(SYM64_ABS_VAL) },
42 { "R_AARCH64_MOVW_UABS_Gn", unsigned_movw, UL(SYM64_ABS_VAL) },
43 { "R_AARCH64_ADR_PREL_PG_HI21", relative_adrp, (u64)&sym64_rel },
44 { "R_AARCH64_ADR_PREL_PG_HI21", relative_adrp_far, (u64)&memstart_addr },
45 { "R_AARCH64_ADR_PREL_LO21", relative_adr, (u64)&sym64_rel },
46 { "R_AARCH64_PREL64", relative_data64, (u64)&sym64_rel },
47 { "R_AARCH64_PREL32", relative_data32, (u64)&sym64_rel },
48 { "R_AARCH64_PREL16", relative_data16, (u64)&sym64_rel },
49 };
50
reloc_test_init(void)51 static int __init reloc_test_init(void)
52 {
53 int i;
54
55 pr_info("Relocation test:\n");
56 pr_info("-------------------------------------------------------\n");
57
58 for (i = 0; i < ARRAY_SIZE(funcs); i++) {
59 u64 ret = funcs[i].f();
60
61 pr_info("%-31s 0x%016llx %s\n", funcs[i].name, ret,
62 ret == funcs[i].expect ? "pass" : "fail");
63 if (ret != funcs[i].expect)
64 pr_err("Relocation failed, expected 0x%016llx, not 0x%016llx\n",
65 funcs[i].expect, ret);
66 }
67 return 0;
68 }
69
reloc_test_exit(void)70 static void __exit reloc_test_exit(void)
71 {
72 }
73
74 module_init(reloc_test_init);
75 module_exit(reloc_test_exit);
76
77 MODULE_DESCRIPTION("Relocation testing module");
78 MODULE_LICENSE("GPL v2");
79