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_adrp_far(void); 32 asmlinkage u64 relative_adr(void); 33 asmlinkage u64 relative_data64(void); 34 asmlinkage u64 relative_data32(void); 35 asmlinkage u64 relative_data16(void); 36 37 static 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 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"); 82