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linux
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/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> */ #ifndef _OBJTOOL_ELF_H #define _OBJTOOL_ELF_H #include <stdio.h> #include <gelf.h> #include <linux/list.h> #include <linux/hashtable.h> #include <linux/rbtree.h> #include <linux/jhash.h> #ifdef LIBELF_USE_DEPRECATED # define elf_getshdrnum elf_getshnum # define elf_getshdrstrndx elf_getshstrndx #endif /* * Fallback for systems without this "read, mmaping if possible" cmd. */ #ifndef ELF_C_READ_MMAP #define ELF_C_READ_MMAP ELF_C_READ #endif struct section { struct list_head list; struct hlist_node hash; struct hlist_node name_hash; GElf_Shdr sh; struct rb_root symbol_tree; struct list_head symbol_list; struct list_head reloc_list; struct section *base, *reloc; struct symbol *sym; Elf_Data *data; char *name; int idx; bool changed, text, rodata, noinstr; }; struct symbol { struct list_head list; struct rb_node node; struct hlist_node hash; struct hlist_node name_hash; GElf_Sym sym; struct section *sec; char *name; unsigned int idx; unsigned char bind, type; unsigned long offset; unsigned int len; struct symbol *pfunc, *cfunc, *alias; bool uaccess_safe; bool static_call_tramp; }; struct reloc { struct list_head list; struct hlist_node hash; union { GElf_Rela rela; GElf_Rel rel; }; struct section *sec; struct symbol *sym; unsigned long offset; unsigned int type; long addend; int idx; bool jump_table_start; }; #define ELF_HASH_BITS 20 struct elf { Elf *elf; GElf_Ehdr ehdr; int fd; bool changed; char *name; unsigned int text_size; struct list_head sections; int symbol_bits; int symbol_name_bits; int section_bits; int section_name_bits; int reloc_bits; struct hlist_head *symbol_hash; struct hlist_head *symbol_name_hash; struct hlist_head *section_hash; struct hlist_head *section_name_hash; struct hlist_head *reloc_hash; }; #define OFFSET_STRIDE_BITS 4 #define OFFSET_STRIDE (1UL << OFFSET_STRIDE_BITS) #define OFFSET_STRIDE_MASK (~(OFFSET_STRIDE - 1)) #define for_offset_range(_offset, _start, _end) \ for (_offset = ((_start) & OFFSET_STRIDE_MASK); \ _offset >= ((_start) & OFFSET_STRIDE_MASK) && \ _offset <= ((_end) & OFFSET_STRIDE_MASK); \ _offset += OFFSET_STRIDE) static inline u32 sec_offset_hash(struct section *sec, unsigned long offset) { u32 ol, oh, idx = sec->idx; offset &= OFFSET_STRIDE_MASK; ol = offset; oh = (offset >> 16) >> 16; __jhash_mix(ol, oh, idx); return ol; } static inline u32 reloc_hash(struct reloc *reloc) { return sec_offset_hash(reloc->sec, reloc->offset); } struct elf *elf_open_read(const char *name, int flags); struct section *elf_create_section(struct elf *elf, const char *name, unsigned int sh_flags, size_t entsize, int nr); int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset, unsigned int type, struct symbol *sym, long addend); int elf_add_reloc_to_insn(struct elf *elf, struct section *sec, unsigned long offset, unsigned int type, struct section *insn_sec, unsigned long insn_off); int elf_write_insn(struct elf *elf, struct section *sec, unsigned long offset, unsigned int len, const char *insn); int elf_write_reloc(struct elf *elf, struct reloc *reloc); struct symbol *elf_create_undef_symbol(struct elf *elf, const char *name); int elf_write(struct elf *elf); void elf_close(struct elf *elf); struct section *find_section_by_name(const struct elf *elf, const char *name); struct symbol *find_func_by_offset(struct section *sec, unsigned long offset); struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset); struct symbol *find_symbol_by_name(const struct elf *elf, const char *name); struct symbol *find_symbol_containing(const struct section *sec, unsigned long offset); struct reloc *find_reloc_by_dest(const struct elf *elf, struct section *sec, unsigned long offset); struct reloc *find_reloc_by_dest_range(const struct elf *elf, struct section *sec, unsigned long offset, unsigned int len); struct symbol *find_func_containing(struct section *sec, unsigned long offset); #define for_each_sec(file, sec) \ list_for_each_entry(sec, &file->elf->sections, list) #endif /* _OBJTOOL_ELF_H */
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