/* 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>

  #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;
  	GElf_Shdr sh;

  	struct list_head symbol_list;

  	DECLARE_HASHTABLE(symbol_hash, 8);

  	struct list_head rela_list;

  	DECLARE_HASHTABLE(rela_hash, 16);

  	struct section *base, *rela;
  	struct symbol *sym;

  	Elf_Data *data;

  	char *name;
  	int idx;

  	unsigned int len;

  	bool changed, text, rodata;

  };
  
  struct symbol {
  	struct list_head list;

  	struct hlist_node 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 rela {
  	struct list_head list;

  	struct hlist_node hash;

  	GElf_Rela rela;

  	struct section *sec;

  	struct symbol *sym;
  	unsigned int type;

  	unsigned long offset;

  	int addend;

  	bool jump_table_start;

  };
  
  struct elf {
  	Elf *elf;
  	GElf_Ehdr ehdr;
  	int fd;
  	char *name;
  	struct list_head sections;

  	DECLARE_HASHTABLE(rela_hash, 16);

  };

  struct elf *elf_read(const char *name, int flags);

  struct section *find_section_by_name(struct elf *elf, const char *name);
  struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);

  struct symbol *find_symbol_by_name(struct elf *elf, const char *name);

  struct symbol *find_symbol_containing(struct section *sec, unsigned long offset);

  struct rela *find_rela_by_dest(struct section *sec, unsigned long offset);
  struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset,
  				     unsigned int len);
  struct symbol *find_containing_func(struct section *sec, unsigned long offset);

  struct section *elf_create_section(struct elf *elf, const char *name, size_t
  				   entsize, int nr);
  struct section *elf_create_rela_section(struct elf *elf, struct section *base);
  int elf_rebuild_rela_section(struct section *sec);
  int elf_write(struct elf *elf);

  void elf_close(struct elf *elf);

  #define for_each_sec(file, sec)						\
  	list_for_each_entry(sec, &file->elf->sections, list)

  
  #endif /* _OBJTOOL_ELF_H */