97 lines
5.3 KiB
C
97 lines
5.3 KiB
C
/*
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* elf_symbol.h
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*
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* Copyright (c) 1991-2020, Linus Torvalds and Linux Kernel project contributors.
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* Copyright (c) 2020-2021, DarkMatterCore <pabloacurielz@gmail.com>.
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*
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* This file is part of nxdumptool (https://github.com/DarkMatterCore/nxdumptool).
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*
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* nxdumptool is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* nxdumptool 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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*
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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, see <https://www.gnu.org/licenses/>.
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*/
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#pragma once
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#ifndef __ELF_SYMBOL_H__
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#define __ELF_SYMBOL_H__
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/* Symbol types. */
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#define STT_NOTYPE 0 /* The symbol type not defined. */
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#define STT_OBJECT 1 /* The symbol is associated with a data object. */
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#define STT_FUNC 2 /* The symbol is associated with a function or other executable code. */
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#define STT_SECTION 3 /* The symbol is associated with a section. */
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#define STT_FILE 4 /* The symbol's name gives the name of the source file associated with the object file. */
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#define STT_COMMON 5 /* The symbol labels an uninitialized common block. */
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#define STT_TLS 6 /* The symbol specifies a Thread-Local Storage entity. */
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#define STT_LOOS 10 /* Reserved for operating system-specific semantics. */
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#define STT_HIOS 12 /* Reserved for operating system-specific semantics. */
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#define STT_LOPROC 13 /* Reserved for processor-specific semantics. */
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#define STT_HIPROC 15 /* Reserved for processor-specific semantics. */
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/* Symbol binding attributes. */
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#define STB_LOCAL 0 /* Local symbols are not visible outside the object file containing their definition. */
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#define STB_GLOBAL 1 /* Global symbols are visible to all object files being combined. */
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#define STB_WEAK 2 /* Weak symbols resemble global symbols, but their definitions have lower precedence. */
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#define STB_LOOS 10 /* Reserved for operating system-specific semantics. */
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#define STB_HIOS 12 /* Reserved for operating system-specific semantics. */
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#define STB_LOPROC 13 /* Reserved for processor-specific semantics. */
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#define STB_HIPROC 15 /* Reserved for processor-specific semantics. */
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/* Symbol visibility. */
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#define STV_DEFAULT 0 /* The symbol visibility is specified by the its binding attribute. */
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#define STV_INTERNAL 1 /* The meaning of this visibility attribute may be defined by processor supplements to further constrain hidden symbols. */
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#define STV_HIDDEN 2 /* The symbol name is not visible to other components. */
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#define STV_PROTECTED 3 /* The symbol is visible in other components but not preemptable. */
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/* Section header index. */
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#define SHN_UNDEF 0 /* The symbol is undefined. */
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#define SHN_LORESERVE 0xFF00
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#define SHN_LOPROC 0xFF00
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#define SHN_HIPROC 0xFF1F
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#define SHN_LOOS 0xFF20
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#define SHN_LIVEPATCH 0xFF20
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#define SHN_HIOS 0xFF3F
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#define SHN_ABS 0xFFF1 /* The symbol has an absolute value that will not change because of relocation. */
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#define SHN_COMMON 0xFFF2 /* Labels a common block that has not yet been allocated. */
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#define SHN_XINDEX 0xFFFF /* The symbol refers to a specific location within a section, but the section header index is too large to be represented directly. */
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#define SHN_HIRESERVE 0xFFFF
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/* Macros. */
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#define ELF_ST_BIND(x) ((x) >> 4) /* Extracts binding value from a st_info field. */
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#define ELF_ST_TYPE(x) ((x) & 0xF) /* Extracts type value from a st_info field. */
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#define ELF_ST_VISIBILITY(x) ((x) & 0x3) /* Extracts visibility value from a st_other field. */
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typedef struct {
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u32 st_name; ///< Symbol name offset within dynamic string table.
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u32 st_value; ///< Symbol value.
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u32 st_size; ///< Symbol size.
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u8 st_info; ///< Symbol type (lower nibble) and binding attributes (upper nibble).
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u8 st_other; ///< Currently specifies a symbol's visibility (lower 3 bits).
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u16 st_shndx; ///< Holds the relevant section header table index.
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} Elf32Symbol;
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NXDT_ASSERT(Elf32Symbol, 0x10);
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typedef struct {
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u32 st_name; ///< Symbol name offset within dynamic string table.
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u8 st_info; ///< Symbol type (lower nibble) and binding attributes (upper nibble).
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u8 st_other; ///< Currently specifies a symbol's visibility (lower 3 bits).
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u16 st_shndx; ///< Holds the relevant section header table index.
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u64 st_value; ///< Symbol value.
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u64 st_size; ///< Symbol size.
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} Elf64Symbol;
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NXDT_ASSERT(Elf64Symbol, 0x18);
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#endif /* __ELF_SYMBOL_H__ */
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