/* 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;	unsigned int len;	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;}; 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;	int 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;	struct list_head sections;	DECLARE_HASHTABLE(symbol_hash, ELF_HASH_BITS);	DECLARE_HASHTABLE(symbol_name_hash, ELF_HASH_BITS);	DECLARE_HASHTABLE(section_hash, ELF_HASH_BITS);	DECLARE_HASHTABLE(section_name_hash, ELF_HASH_BITS);	DECLARE_HASHTABLE(reloc_hash, ELF_HASH_BITS);}; #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, size_t entsize, int nr);struct section *elf_create_reloc_section(struct elf *elf, struct section *base, int reltype);void elf_add_reloc(struct elf *elf, struct reloc *reloc);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);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);int elf_rebuild_reloc_section(struct elf *elf, struct section *sec); #define for_each_sec(file, sec)						\	list_for_each_entry(sec, &file->elf->sections, list) #endif /* _OBJTOOL_ELF_H */