0a2d5a4e90
1. elfloader for shared object example: TencentOS-tiny\examples\elfloader_shared_object keil: TencentOS-tiny\board\TencentOS_tiny_EVB_MX_Plus\KEIL\elfloader_shared_object 2. elfloader for relocatable object: example: TencentOS-tiny\examples\elfloader_relocatable_object keil: TencentOS-tiny\board\TencentOS_tiny_EVB_MX_Plus\KEIL\elfloader_relocatable_object 3. TODO: - add icache/dcache flush when module is loaded - support more relocation type in elfloader_arch_relocate
71 lines
2.8 KiB
C
71 lines
2.8 KiB
C
/*----------------------------------------------------------------------------
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* Tencent is pleased to support the open source community by making TencentOS
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* available.
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*
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* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
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* If you have downloaded a copy of the TencentOS binary from Tencent, please
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* note that the TencentOS binary is licensed under the BSD 3-Clause License.
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*
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* If you have downloaded a copy of the TencentOS source code from Tencent,
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* please note that TencentOS source code is licensed under the BSD 3-Clause
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* License, except for the third-party components listed below which are
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* subject to different license terms. Your integration of TencentOS into your
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* own projects may require compliance with the BSD 3-Clause License, as well
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* as the other licenses applicable to the third-party components included
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* within TencentOS.
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*---------------------------------------------------------------------------*/
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#include "tos_elfloader.h"
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/* values for ELF32_R_TYPE(info) */
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#define R_ARM_ABS32 2
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#define R_ARM_THM_CALL 10
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#define R_ARM_GLOB_DAT 21
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#define R_ARM_JUMP_SLOT 22
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#define R_ARM_RELATIVE 23
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/*
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- S (when used on its own) is the address of the symbol.
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- A is the addend for the relocation.
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- P is the address of the place being relocated (derived from r_offset).
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- Pa is the adjusted address of the place being relocated, defined as (P & 0xFFFFFFFC).
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- T is 1 if the target symbol S has type STT_FUNC and the symbol addresses a Thumb instruction; it is 0
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otherwise.
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- B(S) is the addressing origin of the output segment defining the symbol S. The origin is not required to be the
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base address of the segment. This value must always be word-aligned.
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- GOT_ORG is the addressing origin of the Global Offset Table (the indirection table for imported data
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addresses). This value must always be word-aligned. See §4.6.1.8, Proxy generating relocations.
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- GOT(S) is the address of the GOT entry for the symbol S.
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*/
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// TODO: support more relocation type
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__KNL__ void elfloader_arch_relocate(uint32_t reloc_addr, int32_t load_bias, uint32_t addr, elf32_rela_t *rela, int is_rela)
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{
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/* ATTENTION:
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different reloc_addr calculation algorithm for relocatable object and shared object
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*/
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switch (ELF32_R_TYPE(rela->r_info)) {
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case R_ARM_GLOB_DAT:
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case R_ARM_JUMP_SLOT:
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/* (S + A) | T */
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*(uint32_t *)reloc_addr = addr;
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break;
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case R_ARM_RELATIVE:
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/* B(S) + A */
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*(uint32_t *)reloc_addr += load_bias;
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break;
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case R_ARM_ABS32:
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/* (S + A) | T */
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*(uint32_t *)reloc_addr += addr;
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break;
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default:
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printf("Unsupported Relocation Type: %d\n", ELF32_R_TYPE(rela->r_info));
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break;
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}
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}
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