/* 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_cached 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, init, truncate;}; 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;	unsigned long __subtree_last;	struct symbol *pfunc, *cfunc, *alias;	u8 uaccess_safe      : 1;	u8 static_call_tramp : 1;	u8 retpoline_thunk   : 1;	u8 return_thunk      : 1;	u8 fentry            : 1;	u8 profiling_func    : 1;	struct list_head pv_target;	struct list_head reloc_list;}; struct reloc {	struct list_head list;	struct hlist_node hash;	union {		GElf_Rela rela;		GElf_Rel  rel;	};	struct section *sec;	struct symbol *sym;	struct list_head sym_reloc_entry;	unsigned long offset;	unsigned int type;	s64 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, num_files;	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);} /* * Try to see if it's a whole archive (vmlinux.o or module). * * Note this will miss the case where a module only has one source file. */static inline bool has_multiple_files(struct elf *elf){	return elf->num_files > 1;} static inline int elf_class_addrsize(struct elf *elf){	if (elf->ehdr.e_ident[EI_CLASS] == ELFCLASS32)		return sizeof(u32);	else		return sizeof(u64);} 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); struct symbol *elf_create_prefix_symbol(struct elf *elf, struct symbol *orig, long size); int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,		  unsigned int type, struct symbol *sym, s64 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);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);int find_symbol_hole_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 */