mirror of
https://github.com/libretro/scummvm.git
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244 lines
9.3 KiB
C
244 lines
9.3 KiB
C
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#ifndef BACKENDS_ELF_H
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#define BACKENDS_ELF_H
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/**
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* ELF stuff:
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* The contents of this file were gathered mainly from the SYSTEM V APPLICATION BINARY INTERFACE.
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* Processor-specific things were garnered from processor-specific supplements to the abi.
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*/
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typedef unsigned short Elf32_Half, Elf32_Section;
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typedef unsigned int Elf32_Word, Elf32_Addr, Elf32_Off;
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typedef signed int Elf32_Sword;
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typedef Elf32_Half Elf32_Versym;
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#define EI_NIDENT (16)
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#define SELFMAG 4
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/* ELF File format structures. Look up ELF structure for more details */
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// ELF header (contains info about the file)
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typedef struct {
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unsigned char e_ident[EI_NIDENT]; /* Magic number and other info */
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Elf32_Half e_type; /* Object file type */
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Elf32_Half e_machine; /* Architecture */
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Elf32_Word e_version; /* Object file version */
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Elf32_Addr e_entry; /* Entry point virtual address */
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Elf32_Off e_phoff; /* Program header table file offset */
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Elf32_Off e_shoff; /* Section header table file offset */
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Elf32_Word e_flags; /* Processor-specific flags */
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Elf32_Half e_ehsize; /* ELF header size in bytes */
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Elf32_Half e_phentsize; /* Program header table entry size */
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Elf32_Half e_phnum; /* Program header table entry count */
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Elf32_Half e_shentsize; /* Section header table entry size */
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Elf32_Half e_shnum; /* Section header table entry count */
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Elf32_Half e_shstrndx; /* Section header string table index */
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} Elf32_Ehdr;
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// Should be in e_ident
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#define ELFMAG "\177ELF" /* ELF Magic number */
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#define EI_CLASS 4 /* File class byte index */
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#define ELFCLASS32 1 /* 32-bit objects */
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#define EI_DATA 5 /* Data encoding byte index */
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#define ELFDATA2LSB 1 /* 2's complement, little endian */
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#define ELFDATA2MSB 2 /* 2's complement, big endian */
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#define EI_VERSION 6
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#define EV_CURRENT 1 /* Current version */
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// e_type values
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#define ET_NONE 0 /* no file 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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#define ET_CORE 4 /* core file */
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// e_machine values
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#define EM_MIPS 8
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#define EM_ARM 40
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// Program header (contains info about segment)
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typedef struct {
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Elf32_Word p_type; /* Segment type */
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Elf32_Off p_offset; /* Segment file offset */
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Elf32_Addr p_vaddr; /* Segment virtual address */
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Elf32_Addr p_paddr; /* Segment physical address */
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Elf32_Word p_filesz; /* Segment size in file */
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Elf32_Word p_memsz; /* Segment size in memory */
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Elf32_Word p_flags; /* Segment flags */
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Elf32_Word p_align; /* Segment alignment */
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} Elf32_Phdr;
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// p_type values
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#define PT_NULL 0 /* ignored */
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#define PT_LOAD 1 /* loadable segment */
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#define PT_DYNAMIC 2 /* dynamic linking info */
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#define PT_INTERP 3 /* info about interpreter */
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#define PT_NOTE 4 /* note segment */
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#define PT_SHLIB 5 /* reserved */
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#define PT_PHDR 6 /* Program header table */
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#define PT_MIPS_REGINFO 0x70000000 /* Register usage info for MIPS */
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#define PT_ARM_ARCHEXT 0x70000000 /* Platform architecture compatibility info for ARM */
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#define PT_ARM_EXIDX 0x70000001 /* Exception unwind tables for ARM */
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// p_flags value
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#define PF_X 1 /* execute */
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#define PF_W 2 /* write */
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#define PF_R 4 /* read */
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// Section header (contains info about section)
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typedef struct {
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Elf32_Word sh_name; /* Section name (string tbl index) */
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Elf32_Word sh_type; /* Section type */
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Elf32_Word sh_flags; /* Section flags */
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Elf32_Addr sh_addr; /* Section virtual addr at execution */
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Elf32_Off sh_offset; /* Section file offset */
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Elf32_Word sh_size; /* Section size in bytes */
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Elf32_Word sh_link; /* Link to another section */
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Elf32_Word sh_info; /* Additional section information */
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Elf32_Word sh_addralign; /* Section alignment */
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Elf32_Word sh_entsize; /* Entry size if section holds table */
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} Elf32_Shdr;
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// sh_type values
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#define SHT_NULL 0 /* Inactive section */
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#define SHT_PROGBITS 1 /* Proprietary */
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#define SHT_SYMTAB 2 /* Symbol table */
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#define SHT_STRTAB 3 /* String table */
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#define SHT_RELA 4 /* Relocation entries with addend */
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#define SHT_HASH 5 /* Symbol hash table */
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#define SHT_DYNAMIC 6 /* Info for dynamic linking */
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#define SHT_NOTE 7 /* Note section */
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#define SHT_NOBITS 8 /* Occupies no space */
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#define SHT_REL 9 /* Relocation entries without addend */
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#define SHT_SHLIB 10 /* Reserved */
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#define SHT_DYNSYM 11 /* Minimal set of dynamic linking symbols */
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#define SHT_MIPS_LIBLSIT 0x70000000 /* Info about dynamic shared object libs for MIPS*/
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#define SHT_MIPS_CONFLICT 0x70000002 /* Conflicts btw executables and shared objects for MIPS */
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#define SHT_MIPS_GPTAB 0x70000003 /* Global pointer table for MIPS*/
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#define SHT_ARM_EXIDX 0x70000001 /* Exception Index table for ARM*/
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#define SHT_ARM_PREEMPTMAP 0x70000002 /* BPABI DLL dynamic linking pre-emption map for ARM */
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#define SHT_ARM_ATTRIBUTES 0x70000003 /* Object file compatibility attributes for ARM*/
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// sh_flags values
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#define SHF_WRITE 0 /* writable section */
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#define SHF_ALLOC 2 /* section occupies memory */
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#define SHF_EXECINSTR 4 /* machine instructions */
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#define SHF_MIPS_GPREL 0x10000000 /* Must be made part of global data area for MIPS */
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// Symbol entry (contain info about a symbol)
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typedef struct {
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Elf32_Word st_name; /* Symbol name (string tbl index) */
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Elf32_Addr st_value; /* Symbol value */
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Elf32_Word st_size; /* Symbol size */
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unsigned char st_info; /* Symbol type and binding */
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unsigned char st_other; /* Symbol visibility */
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Elf32_Section st_shndx; /* Section index */
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} Elf32_Sym;
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// Extract from the st_info
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#define SYM_TYPE(x) ((x)&0xF)
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#define SYM_BIND(x) ((x)>>4)
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// Symbol binding values from st_info
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#define STB_LOCAL 0 /* Symbol not visible outside object */
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#define STB_GLOBAL 1 /* Symbol visible to all object files */
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#define STB_WEAK 2 /* Similar to STB_GLOBAL */
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// Symbol type values from st_info
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#define STT_NOTYPE 0 /* Not specified */
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#define STT_OBJECT 1 /* Data object e.g. variable */
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#define STT_FUNC 2 /* Function */
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#define STT_SECTION 3 /* Section */
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#define STT_FILE 4 /* Source file associated with object file */
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// Special section header index values from st_shndex
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#define SHN_UNDEF 0
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#define SHN_LOPROC 0xFF00 /* Extended values */
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#define SHN_ABS 0xFFF1 /* Absolute value: don't relocate */
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#define SHN_COMMON 0xFFF2 /* Common block. Not allocated yet */
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#define SHN_HIPROC 0xFF1F
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#define SHN_HIRESERVE 0xFFFF
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// Relocation entry with implicit addend (info about how to relocate)
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typedef struct {
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Elf32_Addr r_offset; /* Address */
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Elf32_Word r_info; /* Relocation type and symbol index */
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} Elf32_Rel;
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// Relocation entry with explicit addend (info about how to relocate)
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typedef struct
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{
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Elf32_Addr r_offset; /* Address */
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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;
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// Access macros for the relocation info
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#define REL_TYPE(x) ((unsigned char) (x)) /* Extract relocation type */
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#define REL_INDEX(x) ((x)>>8) /* Extract relocation index into symbol table */
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//MIPS relocation types
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#define R_MIPS_NONE 0
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#define R_MIPS_16 1
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#define R_MIPS_32 2
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#define R_MIPS_REL32 3
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#define R_MIPS_26 4
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#define R_MIPS_HI16 5
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#define R_MIPS_LO16 6
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#define R_MIPS_GPREL16 7
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#define R_MIPS_LITERAL 8
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#define R_MIPS_GOT16 9
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#define R_MIPS_PC16 10
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#define R_MIPS_CALL16 11
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#define R_MIPS_GPREL32 12
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#define R_MIPS_GOTHI16 13
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#define R_MIPS_GOTLO16 14
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#define R_MIPS_CALLHI16 15
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#define R_MIPS_CALLLO16 16
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// ARM relocation types
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#define R_ARM_NONE 0
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#define R_ARM_ABS32 2
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#define R_ARM_THM_CALL 10
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#define R_ARM_CALL 28
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#define R_ARM_JUMP24 29
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#define R_ARM_TARGET1 38
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#define R_ARM_V4BX 40
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// Mock function to get value of global pointer for MIPS
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#define getGP() ({ \
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unsigned int __valgp; \
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__asm__ ("add %0, $gp, $0" : "=r"(__valgp) : ); \
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__valgp; \
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})
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#endif /* BACKENDS_ELF_H */
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