202 lines
6.4 KiB
C
202 lines
6.4 KiB
C
/*
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* Copyright (c) 2021-2022 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LOS_DYNLINK_H
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#define _LOS_DYNLINK_H
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#include "elf.h"
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#include "los_compiler.h"
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#include "los_list.h"
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#include "los_memory.h"
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#ifdef __cplusplus
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#if __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#ifdef LOSCFG_AARCH64
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typedef Elf64_Ehdr LD_ELF_EHDR;
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typedef Elf64_Phdr LD_ELF_PHDR;
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typedef Elf64_Sym LD_ELF_SYM;
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typedef Elf64_Dyn LD_ELF_DYN;
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typedef Elf64_Rel LD_ELF_REL;
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typedef Elf64_Rela LD_ELF_RELA;
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#define REL_TYPE(x) ELF64_R_TYPE(x)
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#define REL_SYM(x) ELF64_R_SYM(x)
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#define REL_INFO ELF64_R_INFO
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#else
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typedef Elf32_Ehdr LD_ELF_EHDR;
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typedef Elf32_Phdr LD_ELF_PHDR;
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typedef Elf32_Sym LD_ELF_SYM;
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typedef Elf32_Dyn LD_ELF_DYN;
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typedef Elf32_Rel LD_ELF_REL;
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typedef Elf32_Rela LD_ELF_RELA;
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#define REL_TYPE(x) ELF32_R_TYPE(x)
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#define REL_SYM(x) ELF32_R_SYM(x)
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#define REL_INFO ELF32_R_INFO
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#endif
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#define LD_ELFMAG "\177ELF"
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#define LD_SELFMAG 4
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#define PHDR_NUM_MAX 128
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#define DYNAMIC_CNT 32
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#define HASH_MASK 0xf0000000
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#define WORD_SHIFT 4
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#define HASH_SHIFT 24
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#define BUCKET_IDX 2
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#define ELF_ALIGN_UP(a, b) (((a) + ((b) - 1)) & ~((b) - 1))
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#define ELF_ALIGN_DOWN(a, b) ((a) & ~((b) - 1))
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#define ELF_ALIGN_OFFSET(a, b) ((a) & ((b) - 1))
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#ifndef PATH_MAX
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#define PATH_MAX 256
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#endif
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#ifndef FILE_LENGTH_MAX
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#define FILE_LENGTH_MAX 0x40000
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#endif
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typedef VOID (*INIT_FINI_FUNC)(VOID);
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typedef struct {
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UINTPTR relTab;
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UINT32 relTabSize;
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UINT32 relEntSize;
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} RelocInfo;
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typedef struct {
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RelocInfo rel;
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RelocInfo rela;
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RelocInfo jmpRel;
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} RelocInfoTab;
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typedef struct {
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UINTPTR func;
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UINTPTR array;
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UINT32 arraySz;
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} InitFiniInfo;
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typedef struct {
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InitFiniInfo init;
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InitFiniInfo fini;
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} InitFiniTab;
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typedef struct {
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LD_ELF_EHDR elfEhdr;
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LD_ELF_PHDR *elfPhdr;
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UINTPTR dynBase;
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UINT32 *hashTab;
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LD_ELF_SYM *symTab;
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CHAR *symStrings;
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RelocInfoTab relInfoTab;
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} DynLinkInfo;
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typedef struct {
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CHAR *fileName;
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INT32 fd;
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DynLinkInfo *dlInfo;
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UINTPTR loadBase;
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InitFiniTab initFiniTab;
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LOS_DL_LIST dsoNode;
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UINT32 ref;
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VOID *pool;
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CHAR buf[];
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} DynSharedObj;
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typedef struct {
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CHAR *name;
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UINTPTR addr;
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} SymInfo;
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#define SYM_EXPORT(func) \
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const SymInfo sym_##func __attribute__((__used__, section(".sym."#func))) = { \
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.name = #func, \
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.addr = (UINTPTR)func \
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};
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/*
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* @brief Load the shared library file named by the NULL-terminated string filename and
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* return a valid handle for the loaded library.
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*
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* @param fileName The name pointer of shared library.
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* @param pool The heap for shared library to load. If the parameter, pool, is NULL, then
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* the dynamic loader & linker module will use the default heap and the pool is not NULL,
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* then the shared library will be loaded to the heap by pool.
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*
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* @note When the heap, pool, is not NULL, you should call LOS_MemInit() to initialize the
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* pool before calling LOS_SoLoad(). By the way, the system will consume a certain amount
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* of memory to initialize the pool. LOS_SoLoad must not be called in interrupt callback.
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*
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* @return Return NULL if error. Return non-NULL if success.
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*/
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VOID *LOS_SoLoad(const CHAR *fileName, VOID *pool);
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/*
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* @brief Get the address of symbol named by the parameter, name, from the parameter, handle.
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*
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* @param handle The handle for the loaded shared library.
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* @param name The name of symbol to search.
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*
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* @note LOS_FindSym must not be called in interrupt callback.
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*
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* @return Return NULL if error. Return non-NULL if success.
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*/
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VOID *LOS_FindSym(VOID *handle, const CHAR *name);
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/*
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* @brief Decrement the reference count on the loaded shared library referred to by handle.
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* If the reference count drops to zero, then the library is unloaded.
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*
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* This function validates that the handle is valid.
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*
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* @param handle The handle for the loaded shared library by LOS_SoLoad() interface.
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*
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* @note LOS_SoUnload must not be called in interrupt callback.
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*
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* @return Return 1 if error. Return 0 if success.
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*/
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INT32 LOS_SoUnload(VOID *handle);
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/*
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* @brief Initialization for dynamic loader & linker module.
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*
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* @param VOID.
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*
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* @return Return LOS_NOK if error. Return LOS_OK if success.
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*/
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INT32 LOS_DynlinkInit(VOID);
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#ifdef __cplusplus
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#if __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#endif /* _LOS_DYNLINK_H */
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