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214fad5507
This module tests the module loader's ELF relocation processing
routines. When loaded, it logs output like below.
Relocation test:
-------------------------------------------------------
R_AARCH64_ABS64 0xffff880000cccccc pass
R_AARCH64_ABS32 0x00000000f800cccc pass
R_AARCH64_ABS16 0x000000000000f8cc pass
R_AARCH64_MOVW_SABS_Gn 0xffff880000cccccc pass
R_AARCH64_MOVW_UABS_Gn 0xffff880000cccccc pass
R_AARCH64_ADR_PREL_LO21 0xffffff9cf4d1a400 pass
R_AARCH64_PREL64 0xffffff9cf4d1a400 pass
R_AARCH64_PREL32 0xffffff9cf4d1a400 pass
R_AARCH64_PREL16 0xffffff9cf4d1a400 pass
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/*
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* Copyright (C) 2017 Linaro, Ltd. <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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int sym64_rel;
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#define SYM64_ABS_VAL 0xffff880000cccccc
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#define SYM32_ABS_VAL 0xf800cccc
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#define SYM16_ABS_VAL 0xf8cc
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#define __SET_ABS(name, val) asm(".globl " #name "; .set "#name ", " #val)
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#define SET_ABS(name, val) __SET_ABS(name, val)
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SET_ABS(sym64_abs, SYM64_ABS_VAL);
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SET_ABS(sym32_abs, SYM32_ABS_VAL);
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SET_ABS(sym16_abs, SYM16_ABS_VAL);
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asmlinkage u64 absolute_data64(void);
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asmlinkage u64 absolute_data32(void);
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asmlinkage u64 absolute_data16(void);
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asmlinkage u64 signed_movw(void);
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asmlinkage u64 unsigned_movw(void);
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asmlinkage u64 relative_adrp(void);
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asmlinkage u64 relative_adr(void);
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asmlinkage u64 relative_data64(void);
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asmlinkage u64 relative_data32(void);
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asmlinkage u64 relative_data16(void);
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static struct {
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char name[32];
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u64 (*f)(void);
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u64 expect;
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} const funcs[] = {
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{ "R_AARCH64_ABS64", absolute_data64, UL(SYM64_ABS_VAL) },
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{ "R_AARCH64_ABS32", absolute_data32, UL(SYM32_ABS_VAL) },
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{ "R_AARCH64_ABS16", absolute_data16, UL(SYM16_ABS_VAL) },
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{ "R_AARCH64_MOVW_SABS_Gn", signed_movw, UL(SYM64_ABS_VAL) },
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{ "R_AARCH64_MOVW_UABS_Gn", unsigned_movw, UL(SYM64_ABS_VAL) },
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#ifndef CONFIG_ARM64_ERRATUM_843419
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{ "R_AARCH64_ADR_PREL_PG_HI21", relative_adrp, (u64)&sym64_rel },
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#endif
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{ "R_AARCH64_ADR_PREL_LO21", relative_adr, (u64)&sym64_rel },
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{ "R_AARCH64_PREL64", relative_data64, (u64)&sym64_rel },
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{ "R_AARCH64_PREL32", relative_data32, (u64)&sym64_rel },
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{ "R_AARCH64_PREL16", relative_data16, (u64)&sym64_rel },
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};
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static int reloc_test_init(void)
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{
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int i;
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pr_info("Relocation test:\n");
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pr_info("-------------------------------------------------------\n");
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for (i = 0; i < ARRAY_SIZE(funcs); i++) {
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u64 ret = funcs[i].f();
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pr_info("%-31s 0x%016llx %s\n", funcs[i].name, ret,
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ret == funcs[i].expect ? "pass" : "fail");
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if (ret != funcs[i].expect)
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pr_err("Relocation failed, expected 0x%016llx, not 0x%016llx\n",
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funcs[i].expect, ret);
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}
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return 0;
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}
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static void reloc_test_exit(void)
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{
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}
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module_init(reloc_test_init);
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module_exit(reloc_test_exit);
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MODULE_LICENSE("GPL v2");
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