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
184 lines
7.7 KiB
C
184 lines
7.7 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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#ifndef _ELF32_H_
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#define _ELF32_H_
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#define EI_NIDENT 16
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typedef int32_t elf32_sword;
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typedef uint32_t elf32_word;
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typedef uint16_t elf32_half;
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typedef uint32_t elf32_off;
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typedef uint32_t elf32_addr;
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/* elf header */
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typedef struct elf32_ehdr {
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unsigned char e_ident[EI_NIDENT]; /* ident bytes */
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elf32_half e_type; /* file type */
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elf32_half e_machine; /* target machine */
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elf32_word e_version; /* file version */
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elf32_addr e_entry; /* start address */
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elf32_off e_phoff; /* phdr file offset */
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elf32_off e_shoff; /* shdr file offset */
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elf32_word e_flags; /* file flags */
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elf32_half e_ehsize; /* sizeof ehdr */
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elf32_half e_phentsize; /* sizeof phdr */
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elf32_half e_phnum; /* number phdrs */
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elf32_half e_shentsize; /* sizeof shdr */
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elf32_half e_shnum; /* number shdrs */
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elf32_half e_shstrndx; /* shdr string index */
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} elf32_ehdr_t;
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/* values for e_type. */
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#define ET_NONE 0 /* unknown type. */
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#define ET_REL 1 /* relocatable. */
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#define ET_EXEC 2 /* executable. */
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#define ET_DYN 3 /* shared object. */
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/* section header */
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typedef struct elf32_shdr {
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elf32_word sh_name; /* section name */
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elf32_word sh_type; /* SHT_... */
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elf32_word sh_flags; /* SHF_... */
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elf32_addr sh_addr; /* virtual address */
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elf32_off sh_offset; /* file offset */
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elf32_word sh_size; /* section size */
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elf32_word sh_link; /* misc info */
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elf32_word sh_info; /* misc info */
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elf32_word sh_addralign; /* memory alignment */
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elf32_word sh_entsize; /* entry size if table */
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} elf32_shdr_t;
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/* values for sh_type */
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#define SHT_NULL 0 /* inactive */
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#define SHT_PROGBITS 1 /* program defined information */
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#define SHT_SYMTAB 2 /* symbol table section */
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#define SHT_STRTAB 3 /* string table section */
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#define SHT_RELA 4 /* relocation section with addends*/
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#define SHT_HASH 5 /* symbol hash table section */
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#define SHT_DYNAMIC 6 /* dynamic section */
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#define SHT_NOTE 7 /* note section */
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#define SHT_NOBITS 8 /* no space section */
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#define SHT_REL 9 /* relation section without addends */
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#define SHT_SHLIB 10 /* reserved - purpose unknown */
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#define SHT_DYNSYM 11 /* dynamic symbol table section */
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#define SHT_LOPROC 0x70000000 /* reserved range for processor */
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#define SHT_HIPROC 0x7fffffff /* specific section header types */
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#define SHT_LOUSER 0x80000000 /* reserved range for application */
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#define SHT_HIUSER 0xffffffff /* specific indexes */
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/* values for sh_flags */
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#define SHF_WRITE 1 /* writable */
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#define SHF_ALLOC 2 /* occupies memory */
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#define SHF_EXECINSTR 4 /* executable */
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typedef struct elf32_rel {
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elf32_addr r_offset; /* location to be relocated. */
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elf32_word r_info; /* relocation type and symbol index. */
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} elf32_rel_t;
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typedef struct elf32_rela {
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elf32_addr r_offset; /* location to be relocated. */
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elf32_word r_info; /* relocation type and symbol index. */
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elf32_sword r_addend; /* addend. */
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} elf32_rela_t;
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typedef struct elf32_sym {
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elf32_word st_name; /* string table index of name. */
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elf32_addr st_value; /* symbol value. */
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elf32_word st_size; /* size of associated object. */
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unsigned char st_info; /* type and binding information. */
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unsigned char st_other; /* reserved (not used). */
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elf32_half st_shndx; /* section index of symbol. */
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} elf32_sym_t;
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/* values for st_info(binding) */
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#define STB_LOCAL 0
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#define STB_GLOBAL 1
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#define STB_WEAK 2
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/* values for st_info(type) */
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#define STT_NOTYPE 0
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#define STT_OBJECT 1
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#define STT_FUNC 2
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#define STT_SECTION 3
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#define STT_FILE 4
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/* values for st_shndx */
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#define SHN_ABS 0xFFF1
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#define SHN_COMMON 0xFFF2
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#define SHN_UNDEF 0x0000
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#define ELF32_SYM_BINDING(info) ((info) >> 4)
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#define ELF32_SYM_TYPE(info) ((info) & 0x0F)
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typedef struct elf32_dyn {
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elf32_sword d_tag; /* DT_... */
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union {
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elf32_word d_val;
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elf32_addr d_ptr;
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} d_un;
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} elf32_dyn_t;
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/* values for d_tag */
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#define DT_NULL 0x00
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#define DT_PLTRELSZ 0x02
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#define DT_PLTGOT 0x03
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#define DT_HASH 0x04
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#define DT_STRTAB 0x05
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#define DT_SYMTAB 0x06
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#define DT_STRSZ 0x0a
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#define DT_SYMENT 0x0b
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#define DT_REL 0x11
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#define DT_RELSZ 0x12
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#define DT_RELENT 0x13
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#define DT_PLTREL 0x14
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#define DT_JMPREL 0x17
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/* program header */
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typedef struct elf32_phdr {
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elf32_word p_type; /* PHT_... */
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elf32_off p_offset; /* file offset */
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elf32_addr p_vaddr; /* virtual address */
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elf32_addr p_paddr; /* physical address */
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elf32_word p_filesz; /* file size */
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elf32_word p_memsz; /* memory size */
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elf32_word p_flags; /* read write properties */
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elf32_word p_align; /* alignment attribute, 2 ^ p_align */
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} elf32_phdr_t;
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/* values for p_type */
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#define PHT_LOAD 0x01
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#define PHT_DYNAMIC 0x02
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#define ELF32_R_SYM(info) ((info) >> 8)
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#define ELF32_R_TYPE(info) ((unsigned char)(info))
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#define ELF_MAGIC_HEADER "\177ELF\001\001\001"
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#define ELF_MAGIC_HEADER_SIZE 7
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static const unsigned char elf_header_magic[] = {
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0x7f, 0x45, 0x4c, 0x46, /* Magic: 0x7f, 'E', 'L', 'F' */
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0x01, /* Class: ELF32 */
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0x01, /* Data: 2's complement, 'little endian */
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0x01, /* Version: 1(current) */
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};
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#endif /* _ELF32_H_ */
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