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/* 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_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_ARM_ARCHEXT 0x70000000 /* Platform architecture compatibility information */
#define PT_ARM_EXIDX 0x70000001 /* Exception unwind tables */
// 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_ARM_EXIDX 0x70000001 /* Exception Index table */
#define SHT_ARM_PREEMPTMAP 0x70000002 /* BPABI DLL dynamic linking pre-emption map */
#define SHT_ARM_ATTRIBUTES 0x70000003 /* Object file compatibility attributes */
// sh_flags values
#define SHF_WRITE 0 /* writable section */
#define SHF_ALLOC 2 /* section occupies memory */
#define SHF_EXECINSTR 4 /* machine instructions */
// 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 (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 */
// ARM relocation types
#define R_ARM_NONE 0
#define R_ARM_PC24 1
#define R_ARM_ABS32 2
#define R_ARM_REL32 3
#define R_ARM_LDR_PC_G0 4
#define R_ARM_ABS16 5
#define R_ARM_ABS12 6
#define R_ARM_THM_ABS5 7
#define R_ARM_ABS8 8
#define R_ARM_SBREL32 9
#define R_ARM_THM_CALL 10
#define R_ARM_THM_PC8 11
#define R_ARM_BREL_ADJ 12
#define R_ARM_TLS_DESC 13
#define R_ARM_TLS_DTPMOD32 17
#define R_ARM_TLS_DTPOFF32 18
#define R_ARM_TLS_TPOFF32 19
#define R_ARM_COPY 20
#define R_ARM_GLOB_DAT 21
#define R_ARM_JUMP_SLOT 22
#define R_ARM_RELATIVE 23
#define R_ARM_GOTOFF32 24
#define R_ARM_BASE_PREL 25
#define R_ARM_GOT_BREL 26
#define R_ARM_PLT32 27
#define R_ARM_CALL 28
#define R_ARM_JUMP24 29
#define R_ARM_THM_JUMP24 30
#define R_ARM_BASE_ABS 31
#define R_ARM_ALU_PCREL_7_0 32
#define R_ARM_ALU_PCREL_15_8 33
#define R_ARM_ALU_PCREL_23_15 34
#define R_ARM_LDR_SBREL_11_0_NC 35
#define R_ARM_ALU_SBREL_19_12_NC 36
#define R_ARM_ALU_SBREL_27_20_CK 37
#define R_ARM_TARGET1 38
#define R_ARM_SBREL31 39
#define R_ARM_V4BX 40
#define R_ARM_TARGET2 41
#define R_ARM_PREL31 42
#define R_ARM_MOVW_ABS_NC 43
#define R_ARM_MOVT_ABS 44
#define R_ARM_MOVW_PREL_NC 45
#define R_ARM_MOVT_PREL 46
#define R_ARM_THM_MOVW_ABS_NC 47
#define R_ARM_THM_MOVT_ABS 48
#define R_ARM_THM_MOVW_PREL_NC 49
#define R_ARM_THM_MOVT_PREL 50
#define R_ARM_THM_JUMP19 51
#define R_ARM_THM_JUMP6 52
#define R_ARM_THM_ALU_PREL_11_0 53
#define R_ARM_THM_PC12 54
#define R_ARM_ABS32_NOI 55
#define R_ARM_REL32_NOI 56
#define R_ARM_ALU_PC_G0_NC 57
#define R_ARM_ALU_PC_G0 58
#define R_ARM_ALU_PC_G1_NC 59
#define R_ARM_ALU_PC_G1 60
#define R_ARM_ALU_PC_G2 61
#define R_ARM_LDR_PC_G1 62
#define R_ARM_LDR_PC_G2 63
#define R_ARM_LDRS_PC_G0 64
#define R_ARM_LDRS_PC_G1 65
#define R_ARM_LDRS_PC_G2 66
#define R_ARM_LDC_PC_G0 67
#define R_ARM_LDC_PC_G1 68
#define R_ARM_LDC_PC_G2 69
#define R_ARM_ALU_SB_G0_NC 70
#define R_ARM_ALU_SB_G0 71
#define R_ARM_ALU_SB_G1_NC 72
#define R_ARM_ALU_SB_G1 73
#define R_ARM_ALU_SB_G2 74
#define R_ARM_LDR_SB_G0 75
#define R_ARM_LDR_SB_G1 76
#define R_ARM_LDR_SB_G2 77
#define R_ARM_LDRS_SB_G0 78
#define R_ARM_LDRS_SB_G1 79
#define R_ARM_LDRS_SB_G2 80
#define R_ARM_LDC_SB_G0 81
#define R_ARM_LDC_SB_G1 82
#define R_ARM_LDC_SB_G2 83
#define R_ARM_MOVW_BREL_NC 84
#define R_ARM_MOVT_BREL 85
#define R_ARM_MOVW_BREL 86
#define R_ARM_THM_MOVW_BREL_NC 87
#define R_ARM_THM_MOVT_BREL 88
#define R_ARM_THM_MOVW_BREL 89
#define R_ARM_TLS_GOTDESC 90
#define R_ARM_TLS_CALL 91
#define R_ARM_TLS_DESCSEQ 92
#define R_ARM_THM_TLS_CALL 93
#define R_ARM_PLT32_ABS 94
#define R_ARM_GOT_ABS 95
#define R_ARM_GOT_PREL 96
#define R_ARM_GOT_BREL12 97
#define R_ARM_GOTOFF12 98
#define R_ARM_GOTRELAX 99
#define R_ARM_THM_JUMP11 102
#define R_ARM_THM_JUMP8 103
#define R_ARM_TLS_GD32 104
#define R_ARM_TLS_LDM32 105
#define R_ARM_TLS_LDO32 106
#define R_ARM_TLS_IE32 107
#define R_ARM_TLS_LE32 108
#define R_ARM_TLS_LDO12 109
#define R_ARM_TLS_LE12 110
#define R_ARM_TLS_IE12GP 111
#define R_ARM_PRIVATE_0 112
#define R_ARM_PRIVATE_1 113
#define R_ARM_PRIVATE_2 114
#define R_ARM_PRIVATE_3 115
#define R_ARM_PRIVATE_4 116
#define R_ARM_PRIVATE_5 117
#define R_ARM_PRIVATE_6 118
#define R_ARM_PRIVATE_7 119
#define R_ARM_PRIVATE_8 120
#define R_ARM_PRIVATE_9 121
#define R_ARM_PRIVATE_10 122
#define R_ARM_PRIVATE_11 123
#define R_ARM_PRIVATE_12 124
#define R_ARM_PRIVATE_13 125
#define R_ARM_PRIVATE_14 126
#define R_ARM_PRIVATE_15 127
#define R_ARM_THM_TLS_DESCSEQ16 129
#define R_ARM_THM_TLS_DESCSEQ32 130
#endif /* BACKENDS_ELF_H */
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