uclibc-ng/ldso/ldso/ld_hash.h

#ifndef _HASH_H_
#define _HASH_H_

#include "linuxelf.h"

/* Header file that describes the internal data structures used by the
 * ELF dynamic linker.  */

struct link_map
{
  /* These entries must be in this order to be compatible with the
   * interface used by gdb to obtain the list of symbols. */
  Elf32_Addr l_addr;	/* address at which object is mapped */
  char *l_name;		/* full name of loaded object */
  Elf32_Dyn *l_ld;	/* dynamic structure of object */
  struct link_map *l_next;
  struct link_map *l_prev;
};

/* The DT_DEBUG entry in the .dynamic section is given the address of
 * this structure. gdb can pick this up to obtain the correct list of
 * loaded modules. */
struct r_debug
{
  int r_version;		/* debugging info version no */
  struct link_map *r_map;	/* address of link_map */
  unsigned long r_brk;		/* address of update routine */
  enum
  {
    RT_CONSISTENT,
    RT_ADD,
    RT_DELETE
  } r_state;
  unsigned long r_ldbase;	/* base addr of ld.so */
};

#ifndef RTLD_NEXT
#define RTLD_NEXT	((void*)-1)
#endif

struct dyn_elf{
  unsigned long flags;
  struct elf_resolve * dyn;
  struct dyn_elf * next_handle;  /* Used by dlopen et al. */
  struct dyn_elf * next;
  struct dyn_elf * prev;
};
 
struct elf_resolve{
  /* These entries must be in this order to be compatible with the interface used
     by gdb to obtain the list of symbols. */
  char * loadaddr;
  char * libname;
  unsigned long dynamic_addr;
  struct elf_resolve * next;
  struct elf_resolve * prev;
  /* Nothing after this address is used by gdb. */
  enum {elf_lib, elf_executable,program_interpreter, loaded_file} libtype;
  struct dyn_elf * symbol_scope;
  unsigned short usage_count;
  unsigned short int init_flag;
  unsigned int nbucket;
  unsigned long * elf_buckets;
  /*
   * These are only used with ELF style shared libraries
   */
  unsigned long nchain;
  unsigned long * chains;
  unsigned long dynamic_info[24];

  unsigned long dynamic_size;
  unsigned long n_phent;
  Elf32_Phdr * ppnt;

#if defined(__mips__)
  /* Needed for MIPS relocation */
  unsigned long mips_gotsym;
  unsigned long mips_local_gotno;
  unsigned long mips_symtabno;
#endif

#ifdef __powerpc__
  /* this is used to store the address of relocation data words, so
   * we don't have to calculate it every time, which requires a divide */
  unsigned long data_words;
#endif
};

#if 0
/*
 * The DT_DEBUG entry in the .dynamic section is given the address of this structure.
 * gdb can pick this up to obtain the correct list of loaded modules.
 */

struct r_debug{
  int r_version;
  struct elf_resolve * link_map;
  unsigned long brk_fun;
  enum {RT_CONSISTENT, RT_ADD, RT_DELETE};
  unsigned long ldbase;
};
#endif

#define COPY_RELOCS_DONE 1
#define RELOCS_DONE 2
#define JMP_RELOCS_DONE 4
#define INIT_FUNCS_CALLED 8

extern struct dyn_elf     * _dl_symbol_tables;
extern struct elf_resolve * _dl_loaded_modules;
extern struct dyn_elf 	  * _dl_handles;

extern struct elf_resolve * _dl_check_hashed_files(const char * libname);
extern struct elf_resolve * _dl_add_elf_hash_table(const char * libname, 
	char * loadaddr, unsigned long * dynamic_info, 
	unsigned long dynamic_addr, unsigned long dynamic_size);

enum caller_type{symbolrel=0,copyrel=1,resolver=2};
extern char * _dl_find_hash(const char * name, struct dyn_elf * rpnt1, 
	struct elf_resolve * f_tpnt, enum caller_type);

extern int _dl_linux_dynamic_link(void);

extern char * _dl_library_path;
extern char * _dl_not_lazy;
extern unsigned long _dl_elf_hash(const char * name);

static inline int _dl_symbol(char * name)
{
  if(name[0] != '_' || name[1] != 'd' || name[2] != 'l' || name[3] != '_')
    return 0;
  return 1;
}


#define LD_ERROR_NOFILE 1
#define LD_ERROR_NOZERO 2
#define LD_ERROR_NOTELF 3
#define LD_ERROR_NOTMAGIC 4
#define LD_ERROR_NOTDYN 5
#define LD_ERROR_MMAP_FAILED 6
#define LD_ERROR_NODYNAMIC 7
#define LD_WRONG_RELOCS 8
#define LD_BAD_HANDLE 9
#define LD_NO_SYMBOL 10



#endif /* _HASH_H_ */