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Diffstat (limited to 'backends/plugins/elf/elf32.h')
| -rw-r--r-- | backends/plugins/elf/elf32.h | 259 |
1 files changed, 258 insertions, 1 deletions
diff --git a/backends/plugins/elf/elf32.h b/backends/plugins/elf/elf32.h index 5692c8a07b..d3a8d2e436 100644 --- a/backends/plugins/elf/elf32.h +++ b/backends/plugins/elf/elf32.h @@ -1 +1,258 @@ -dummy +/* 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 + +#include "common/scummsys.h" + +#if defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) + +/** + * ELF stuff: + * The contents of this file were gathered mainly from the SYSTEM V APPLICATION BINARY INTERFACE. + * Processor-specific things were garnered from processor-specific supplements to the abi. + */ + +typedef uint16 Elf32_Half, Elf32_Section; +typedef uint32 Elf32_Word, Elf32_Addr, Elf32_Off; +typedef int32 Elf32_Sword; +typedef Elf32_Half Elf32_Versym; + +#define EI_NIDENT (16) +#define SELFMAG 4 + +/* ELF File format structures. Look up ELF structure for more details */ + +// ELF header (contains info about the file) +typedef struct { + byte 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" /* ELF Magic number */ + +#define EI_CLASS 4 /* File class byte index */ +#define ELFCLASS32 1 /* 32-bit objects */ + +#define EI_DATA 5 /* Data encoding byte index */ +#define ELFDATA2LSB 1 /* 2's complement, little endian */ +#define ELFDATA2MSB 2 /* 2's complement, big endian */ + +#define EI_VERSION 6 +#define EV_CURRENT 1 /* Current version */ + +// 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_PPC 20 +#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 */ + byte st_info; /* Symbol type and binding */ + byte 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) ((byte) (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 + +// PPC relocation types +#define R_PPC_ADDR32 1 +#define R_PPC_ADDR16_LO 4 +#define R_PPC_ADDR16_HI 5 +#define R_PPC_ADDR16_HA 6 +#define R_PPC_REL24 10 +#define R_PPC_REL32 26 + +// Mock function to get value of global pointer for MIPS +#define getGP() { \ + uint32 __valgp; \ + __asm__ ("add %0, $gp, $0" : "=r"(__valgp) : ); \ + __valgp; \ +} + +#endif // defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) + +#endif /* BACKENDS_ELF_H */ + |