/* ScummVM - Graphic Adventure Engine * * ScummVM is the legal property of its developers, whose names * are too numerous to list here. Please refer to the COPYRIGHT * file distributed with this source distribution. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * $URL$ * $Id$ * */ #ifndef BACKENDS_ELF_H #define BACKENDS_ELF_H /* ELF stuff */ typedef unsigned short Elf32_Half, Elf32_Section; typedef unsigned int Elf32_Word, Elf32_Addr, Elf32_Off; typedef signed int Elf32_Sword; typedef Elf32_Half Elf32_Versym; #define EI_NIDENT (16) #define SELFMAG 6 /* ELF File format structures. Look up ELF structure for more details */ // ELF header (contains info about the file) typedef struct { unsigned char e_ident[EI_NIDENT]; /* Magic number and other info */ Elf32_Half e_type; /* Object file type */ Elf32_Half e_machine; /* Architecture */ Elf32_Word e_version; /* Object file version */ Elf32_Addr e_entry; /* Entry point virtual address */ Elf32_Off e_phoff; /* Program header table file offset */ Elf32_Off e_shoff; /* Section header table file offset */ Elf32_Word e_flags; /* Processor-specific flags */ Elf32_Half e_ehsize; /* ELF header size in bytes */ Elf32_Half e_phentsize; /* Program header table entry size */ Elf32_Half e_phnum; /* Program header table entry count */ Elf32_Half e_shentsize; /* Section header table entry size */ Elf32_Half e_shnum; /* Section header table entry count */ Elf32_Half e_shstrndx; /* Section header string table index */ } Elf32_Ehdr; // Should be in e_ident #define ELFMAG "\177ELF\1\1" /* ELF Magic number */ // e_type values #define ET_NONE 0 /* no file type */ #define ET_REL 1 /* relocatable */ #define ET_EXEC 2 /* executable */ #define ET_DYN 3 /* shared object */ #define ET_CORE 4 /* core file */ // e_machine values #define EM_MIPS 8 #define EM_ARM 40 // Program header (contains info about segment) typedef struct { Elf32_Word p_type; /* Segment type */ Elf32_Off p_offset; /* Segment file offset */ Elf32_Addr p_vaddr; /* Segment virtual address */ Elf32_Addr p_paddr; /* Segment physical address */ Elf32_Word p_filesz; /* Segment size in file */ Elf32_Word p_memsz; /* Segment size in memory */ Elf32_Word p_flags; /* Segment flags */ Elf32_Word p_align; /* Segment alignment */ } Elf32_Phdr; // p_type values #define PT_NULL 0 /* ignored */ #define PT_LOAD 1 /* loadable segment */ #define PT_DYNAMIC 2 /* dynamic linking info */ #define PT_INTERP 3 /* info about interpreter */ #define PT_NOTE 4 /* note segment */ #define PT_SHLIB 5 /* reserved */ #define PT_PHDR 6 /* Program header table */ #define PT_MIPS_REGINFO 0x70000000 /* Register usage info for MIPS */ #define PT_ARM_ARCHEXT 0x70000000 /* Platform architecture compatibility info for ARM */ #define PT_ARM_EXIDX 0x70000001 /* Exception unwind tables for ARM */ // p_flags value #define PF_X 1 /* execute */ #define PF_W 2 /* write */ #define PF_R 4 /* read */ // Section header (contains info about section) typedef struct { Elf32_Word sh_name; /* Section name (string tbl index) */ Elf32_Word sh_type; /* Section type */ Elf32_Word sh_flags; /* Section flags */ Elf32_Addr sh_addr; /* Section virtual addr at execution */ Elf32_Off sh_offset; /* Section file offset */ Elf32_Word sh_size; /* Section size in bytes */ Elf32_Word sh_link; /* Link to another section */ Elf32_Word sh_info; /* Additional section information */ Elf32_Word sh_addralign; /* Section alignment */ Elf32_Word sh_entsize; /* Entry size if section holds table */ } Elf32_Shdr; // sh_type values #define SHT_NULL 0 /* Inactive section */ #define SHT_PROGBITS 1 /* Proprietary */ #define SHT_SYMTAB 2 /* Symbol table */ #define SHT_STRTAB 3 /* String table */ #define SHT_RELA 4 /* Relocation entries with addend */ #define SHT_HASH 5 /* Symbol hash table */ #define SHT_DYNAMIC 6 /* Info for dynamic linking */ #define SHT_NOTE 7 /* Note section */ #define SHT_NOBITS 8 /* Occupies no space */ #define SHT_REL 9 /* Relocation entries without addend */ #define SHT_SHLIB 10 /* Reserved */ #define SHT_DYNSYM 11 /* Minimal set of dynamic linking symbols */ #define SHT_MIPS_LIBLSIT 0x70000000 /* Info about dynamic shared object libs for MIPS*/ #define SHT_MIPS_CONFLICT 0x70000002 /* Conflicts btw executables and shared objects for MIPS */ #define SHT_MIPS_GPTAB 0x70000003 /* Global pointer table for MIPS*/ #define SHT_ARM_EXIDX 0x70000001 /* Exception Index table for ARM*/ #define SHT_ARM_PREEMPTMAP 0x70000002 /* BPABI DLL dynamic linking pre-emption map for ARM */ #define SHT_ARM_ATTRIBUTES 0x70000003 /* Object file compatibility attributes for ARM*/ // sh_flags values #define SHF_WRITE 0 /* writable section */ #define SHF_ALLOC 2 /* section occupies memory */ #define SHF_EXECINSTR 4 /* machine instructions */ #define SHF_MIPS_GPREL 0x10000000 /* Must be made part of global data area for MIPS */ // Symbol entry (contain info about a symbol) typedef struct { Elf32_Word st_name; /* Symbol name (string tbl index) */ Elf32_Addr st_value; /* Symbol value */ Elf32_Word st_size; /* Symbol size */ unsigned char st_info; /* Symbol type and binding */ unsigned char st_other; /* Symbol visibility */ Elf32_Section st_shndx; /* Section index */ } Elf32_Sym; // Extract from the st_info #define SYM_TYPE(x) ((x)&0xF) #define SYM_BIND(x) ((x)>>4) // Symbol binding values from st_info #define STB_LOCAL 0 /* Symbol not visible outside object */ #define STB_GLOBAL 1 /* Symbol visible to all object files */ #define STB_WEAK 2 /* Similar to STB_GLOBAL */ // Symbol type values from st_info #define STT_NOTYPE 0 /* Not specified */ #define STT_OBJECT 1 /* Data object e.g. variable */ #define STT_FUNC 2 /* Function */ #define STT_SECTION 3 /* Section */ #define STT_FILE 4 /* Source file associated with object file */ // Special section header index values from st_shndex #define SHN_UNDEF 0 #define SHN_LOPROC 0xFF00 /* Extended values */ #define SHN_ABS 0xFFF1 /* Absolute value: don't relocate */ #define SHN_COMMON 0xFFF2 /* Common block. Not allocated yet */ #define SHN_HIPROC 0xFF1F #define SHN_HIRESERVE 0xFFFF // Relocation entry with implicit addend (info about how to relocate) typedef struct { Elf32_Addr r_offset; /* Address */ Elf32_Word r_info; /* Relocation type and symbol index */ } Elf32_Rel; // Relocation entry with explicit addend (info about how to relocate) typedef struct { Elf32_Addr r_offset; /* Address */ Elf32_Word r_info; /* Relocation type and symbol index */ Elf32_Sword r_addend; /* Addend */ } Elf32_Rela; // Access macros for the relocation info #define REL_TYPE(x) ((unsigned char) (x)) /* Extract relocation type */ #define REL_INDEX(x) ((x)>>8) /* Extract relocation index into symbol table */ //MIPS relocation 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 R_MIPS_GOTHI16 13 #define R_MIPS_GOTLO16 14 #define R_MIPS_CALLHI16 15 #define R_MIPS_CALLLO16 16 // ARM relocation types #define R_ARM_NONE 0 #define R_ARM_ABS32 2 #define R_ARM_THM_CALL 10 #define R_ARM_CALL 28 #define R_ARM_JUMP24 29 #define R_ARM_TARGET1 38 #define R_ARM_V4BX 40 // Mock function to get value of global pointer for MIPS #define getGP() ({ \ unsigned int __valgp; \ __asm__ ("add %0, $gp, $0" : "=r"(__valgp) : ); \ __valgp; \ }) #endif /* BACKENDS_ELF_H */