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support elfloader for shared object and relocatable object

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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
This commit is contained in:
daishengdong
2020-06-09 19:30:38 +08:00
parent dc0c649c7c
commit 0a2d5a4e90
35 changed files with 7342 additions and 10 deletions
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70
components/elfloader/common/tos_elfloader_relocate-arm.c Normal file
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/*----------------------------------------------------------------------------
* Tencent is pleased to support the open source community by making TencentOS
* available.
*
* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
* If you have downloaded a copy of the TencentOS binary from Tencent, please
* note that the TencentOS binary is licensed under the BSD 3-Clause License.
*
* If you have downloaded a copy of the TencentOS source code from Tencent,
* please note that TencentOS source code is licensed under the BSD 3-Clause
* License, except for the third-party components listed below which are
* subject to different license terms. Your integration of TencentOS into your
* own projects may require compliance with the BSD 3-Clause License, as well
* as the other licenses applicable to the third-party components included
* within TencentOS.
*---------------------------------------------------------------------------*/
#include "tos_elfloader.h"
/* values for ELF32_R_TYPE(info) */
#define R_ARM_ABS32 2
#define R_ARM_THM_CALL 10
#define R_ARM_GLOB_DAT 21
#define R_ARM_JUMP_SLOT 22
#define R_ARM_RELATIVE 23
/*
- S (when used on its own) is the address of the symbol.
- A is the addend for the relocation.
- P is the address of the place being relocated (derived from r_offset).
- Pa is the adjusted address of the place being relocated, defined as (P & 0xFFFFFFFC).
- T is 1 if the target symbol S has type STT_FUNC and the symbol addresses a Thumb instruction; it is 0
otherwise.
- B(S) is the addressing origin of the output segment defining the symbol S. The origin is not required to be the
base address of the segment. This value must always be word-aligned.
- GOT_ORG is the addressing origin of the Global Offset Table (the indirection table for imported data
addresses). This value must always be word-aligned. See §4.6.1.8, Proxy generating relocations.
- GOT(S) is the address of the GOT entry for the symbol S.
*/
// TODO: support more relocation type
__KNL__ void elfloader_arch_relocate(uint32_t reloc_addr, int32_t load_bias, uint32_t addr, elf32_rela_t *rela, int is_rela)
{
/* ATTENTION:
different reloc_addr calculation algorithm for relocatable object and shared object
*/
switch (ELF32_R_TYPE(rela->r_info)) {
case R_ARM_GLOB_DAT:
case R_ARM_JUMP_SLOT:
/* (S + A) | T */
*(uint32_t *)reloc_addr = addr;
break;
case R_ARM_RELATIVE:
/* B(S) + A */
*(uint32_t *)reloc_addr += load_bias;
break;
case R_ARM_ABS32:
/* (S + A) | T */
*(uint32_t *)reloc_addr += addr;
break;
default:
printf("Unsupported Relocation Type: %d\n", ELF32_R_TYPE(rela->r_info));
break;
}
}