elftypes.h

/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Copyright 2001-2022, ps2dev - http://www.ps2dev.org
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
 
#ifndef __ELF_TYPES_H__
#define __ELF_TYPES_H__
 
#include "types.h"
 
#define ELF_MACHINE_MIPS 0x0008
#define ELF_SH_STRTAB ".shstrtab"
 
#define ELF_SECT_MAX_NAME 128
 
/* Structure defining a single elf section */
struct ElfSection
{
    /* Name index */
    uint32_t iName;
    /* Type of section */
    uint32_t iType;
    /* Section flags */
    uint32_t iFlags;
    /* Addr of section when loaded */
    uint32_t iAddr;
    /* Offset of the section in the elf */
    uint32_t iOffset;
    /* Size of the sections data */
    uint32_t iSize;
    /* Link info */
    uint32_t iLink;
    /* Info */
    uint32_t iInfo;
    /* Address alignment */
    uint32_t iAddralign;
    /* Entry size */
    uint32_t iEntsize;
 
    /* Aliased pointer to the data (in the original Elf) */
    uint8_t *pData;
    /* Name of the section */
    char szName[ELF_SECT_MAX_NAME];
    /* Index */
    int iIndex;
    /* Section Ref. Used for relocations */
    struct ElfSection *pRef;
    /* Indicates if this section is to be outputted */
    int blOutput;
};
 
struct ElfProgram
{
    uint32_t iType;
    uint32_t iOffset;
    uint32_t iVaddr;
    uint32_t iPaddr;
    uint32_t iFilesz;
    uint32_t iMemsz;
    uint32_t iFlags;
    uint32_t iAlign;
 
    /* Aliased pointer to the data (in the original Elf)*/
    uint8_t  *pData;
};
 
/* Structure to hold elf header data, in native format */
struct ElfHeader
{
    uint32_t iMagic;
    uint32_t iClass;
    uint32_t iData;
    uint32_t iIdver;
    uint32_t iType;
    uint32_t iMachine;
    uint32_t iVersion;
    uint32_t iEntry;
    uint32_t iPhoff;
    uint32_t iShoff;
    uint32_t iFlags;
    uint32_t iEhsize;
    uint32_t iPhentsize;
    uint32_t iPhnum;
    uint32_t iShentsize;
    uint32_t iShnum;
    uint32_t iShstrndx;
};
 
struct ElfReloc
{
    /* Pointer to the section name */
    const char* secname;
    /* Base address */
    uint32_t base;
    /* Type */
    uint32_t type;
    /* Symbol (if known) */
    uint32_t symbol;
    /* Offset into the file */
    uint32_t offset;
    /* New Address for the relocation (to do with what you will) */
    uint32_t addr;
};
 
/* Define ELF types */
typedef uint32_t Elf32_Addr;
typedef uint16_t Elf32_Half;
typedef uint32_t Elf32_Off;
typedef int32_t Elf32_Sword;
typedef uint32_t Elf32_Word;
 
#define ELF_MAGIC   0x464C457F
 
#define ELF_EXEC_TYPE 0x0002
#define ELF_IRX_TYPE  0xFF80
 
#define SHT_NULL 0
#define SHT_PROGBITS 1
#define SHT_SYMTAB 2
#define SHT_STRTAB 3
#define SHT_RELA 4
#define SHT_HASH 5
#define SHT_DYNAMIC 6
#define SHT_NOTE 7
#define SHT_NOBITS 8
#define SHT_REL 9
#define SHT_SHLIB 10
#define SHT_DYNSYM 11
#define SHT_LOPROC 0x70000000
#define SHT_HIPROC 0x7fffffff
#define SHT_LOUSER 0x80000000
#define SHT_HIUSER 0xffffffff
 
#define SHT_LOPROC_EE_IMPORT_TAB 0x90
#define SHT_LOPROC_IOPMOD        0x80
 
// MIPS Reloc Entry Types
#define R_MIPS_NONE     0
#define R_MIPS_16       1
#define R_MIPS_32       2
#define R_MIPS_REL32    3
#define R_MIPS_26       4
#define R_MIPS_HI16     5
#define R_MIPS_LO16     6
#define R_MIPS_GPREL16  7
#define R_MIPS_LITERAL  8
#define R_MIPS_GOT16    9
#define R_MIPS_PC16     10
#define R_MIPS_CALL16   11
#define R_MIPS_GPREL32  12
 
#define SHF_WRITE       1
#define SHF_ALLOC       2
#define SHF_EXECINSTR   4
 
#define PT_NULL         0
#define PT_LOAD         1
#define PT_DYNAMIC      2
#define PT_INTERP       3
#define PT_NOTE         4
#define PT_SHLIB        5
#define PT_PHDR         6
#define PT_LOPROC       0x70000000
#define PT_HIPROC       0x7fffffff
 
/* ELF file header */
typedef struct {
    Elf32_Word e_magic;
    uint8_t e_class;
    uint8_t e_data;
    uint8_t e_idver;
    uint8_t e_pad[9];
    Elf32_Half e_type;
    Elf32_Half e_machine;
    Elf32_Word e_version;
    Elf32_Addr e_entry;
    Elf32_Off e_phoff;
    Elf32_Off e_shoff;
    Elf32_Word e_flags;
    Elf32_Half e_ehsize;
    Elf32_Half e_phentsize;
    Elf32_Half e_phnum;
    Elf32_Half e_shentsize;
    Elf32_Half e_shnum;
    Elf32_Half e_shstrndx;
} __attribute__((packed)) Elf32_Ehdr;
 
/* ELF section header */
typedef struct {
    Elf32_Word sh_name;
    Elf32_Word sh_type;
    Elf32_Word sh_flags;
    Elf32_Addr sh_addr;
    Elf32_Off sh_offset;
    Elf32_Word sh_size;
    Elf32_Word sh_link;
    Elf32_Word sh_info;
    Elf32_Word sh_addralign;
    Elf32_Word sh_entsize;
} __attribute__((packed)) Elf32_Shdr;
 
typedef struct {
    Elf32_Word p_type;
    Elf32_Off p_offset;
    Elf32_Addr p_vaddr;
    Elf32_Addr p_paddr;
    Elf32_Word p_filesz;
    Elf32_Word p_memsz;
    Elf32_Word p_flags;
    Elf32_Word p_align;
} Elf32_Phdr;
 
#define ELF32_R_SYM(i) ((i)>>8)
#define ELF32_R_TYPE(i) ((uint8_t)(i&0xFF))
 
typedef struct {
    Elf32_Addr r_offset;
    Elf32_Word r_info;
} Elf32_Rel;
 
typedef struct {
    Elf32_Word st_name;
    Elf32_Addr st_value;
    Elf32_Word st_size;
    unsigned char st_info;
    unsigned char st_other;
    Elf32_Half st_shndx;
} __attribute__((packed)) Elf32_Sym;
 
#define STB_LOCAL 0
#define STB_GLOBAL 1
#define STB_WEAK 2
#define STB_LOPROC 13
#define STB_HIPROC 15
 
#define ELF32_ST_BIND(i) ((i)>>4)
#define ELF32_ST_TYPE(i) ((i)&0xf)
#define ELF32_ST_INFO(b,t) (((b)<<4)+((t)&0xf))
 
#endif