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      1 /*	$NetBSD: link_elf.h,v 1.13 2020/09/22 01:52:16 kamil Exp $	*/
      2 
      3 #ifndef _LINK_ELF_H_
      4 #define	_LINK_ELF_H_
      5 
      6 #include <sys/types.h>
      7 #include <sys/exec_elf.h>
      8 
      9 #define R_DEBUG_VERSION	1 /* SVR4 Protocol version */
     10 
     11 typedef struct link_map {
     12 	caddr_t		 l_addr;	/* Base Address of library */
     13 #ifdef __mips__
     14 	caddr_t		 l_offs;	/* Load Offset of library */
     15 #endif
     16 	const char	*l_name;	/* Absolute Path to Library */
     17 	void		*l_ld;		/* Pointer to .dynamic in memory */
     18 	struct link_map	*l_next;	/* linked list of mapped libs */
     19 	struct link_map *l_prev;
     20 } Link_map;
     21 
     22 /*
     23  * Debug rendezvous struct. Pointer to this is set up in the
     24  * target code pointed by the DT_DEBUG tag. If it is
     25  * defined.
     26  */
     27 struct r_debug {
     28 	int r_version;			/* protocol version */
     29 	struct link_map *r_map;		/* list of loaded images */
     30 
     31 	/*
     32 	 * This is the address of a function internal to the run-time linker,
     33 	 * that will always be called when the linker begins to map in a
     34 	 * library or unmap it, and again when the mapping change is complete.
     35 	 * The debugger can set a breakpoint at this address if it wants to
     36 	 * notice shared object mapping changes.
     37 	 */
     38 	void (*r_brk)(void);		/* pointer to break point */
     39 	enum {
     40 		/*
     41 		 * This state value describes the mapping change taking place
     42 		 * when the `r_brk' address is called.
     43 		 */
     44 		RT_CONSISTENT,		/* things are stable */
     45 		RT_ADD,			/* adding a shared library */
     46 		RT_DELETE		/* removing a shared library */
     47 	} r_state;
     48 	void *r_ldbase;			/* base address of RTLD */
     49 };
     50 
     51 struct dl_phdr_info
     52 {
     53 	Elf_Addr dlpi_addr;			/* module relocation base */
     54 	const char *dlpi_name;			/* module name */
     55 	const Elf_Phdr *dlpi_phdr;		/* pointer to module's phdr */
     56 	Elf_Half dlpi_phnum;			/* number of entries in phdr */
     57 	unsigned long long int dlpi_adds;	/* total # of loads */
     58 	unsigned long long int dlpi_subs;	/* total # of unloads */
     59 	size_t dlpi_tls_modid;
     60 	void *dlpi_tls_data;
     61 };
     62 
     63 __BEGIN_DECLS
     64 
     65 int dl_iterate_phdr(int (*)(struct dl_phdr_info *, size_t, void *),
     66     void *);
     67 
     68 __END_DECLS
     69 
     70 #endif	/* _LINK_ELF_H_ */
     71