arch/arm64/kernel/reloc_test_core.c

   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
  51 static int 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
  70 static void reloc_test_exit(void)
  71 {
  72 }
  73
  74 module_init(reloc_test_init);
  75 module_exit(reloc_test_exit);
  76
  77 MODULE_LICENSE("GPL v2");