arch/arm64/kernel/reloc_test_core.c

   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
  12 int 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
  21 SET_ABS(sym64_abs, SYM64_ABS_VAL);
  22 SET_ABS(sym32_abs, SYM32_ABS_VAL);
  23 SET_ABS(sym16_abs, SYM16_ABS_VAL);
  24
  25 asmlinkage u64 absolute_data64(void);
  26 asmlinkage u64 absolute_data32(void);
  27 asmlinkage u64 absolute_data16(void);
  28 asmlinkage u64 signed_movw(void);
  29 asmlinkage u64 unsigned_movw(void);
  30 asmlinkage u64 relative_adrp(void);
  31 asmlinkage u64 relative_adr(void);
  32 asmlinkage u64 relative_data64(void);
  33 asmlinkage u64 relative_data32(void);
  34 asmlinkage u64 relative_data16(void);
  35
  36 static struct {
  37         char    name[32];
  38         u64     (*f)(void);
  39         u64     expect;
  40 } const funcs[] = {
  41         { "R_AARCH64_ABS64",            absolute_data64, UL(SYM64_ABS_VAL) },
  42         { "R_AARCH64_ABS32",            absolute_data32, UL(SYM32_ABS_VAL) },
  43         { "R_AARCH64_ABS16",            absolute_data16, UL(SYM16_ABS_VAL) },
  44         { "R_AARCH64_MOVW_SABS_Gn",     signed_movw, UL(SYM64_ABS_VAL) },
  45         { "R_AARCH64_MOVW_UABS_Gn",     unsigned_movw, UL(SYM64_ABS_VAL) },
  46 #ifndef CONFIG_ARM64_ERRATUM_843419
  47         { "R_AARCH64_ADR_PREL_PG_HI21", relative_adrp, (u64)&sym64_rel },
  48 #endif
  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
  55 static 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
  74 static void reloc_test_exit(void)
  75 {
  76 }
  77
  78 module_init(reloc_test_init);
  79 module_exit(reloc_test_exit);
  80
  81 MODULE_LICENSE("GPL v2");