/*      $NetBSD: link_elf.h,v 1.13 2020/09/22 01:52:16 kamil Exp $      */

#ifndef _LINK_ELF_H_
#define _LINK_ELF_H_

#include <sys/types.h>
#include <sys/exec_elf.h>

#define R_DEBUG_VERSION 1 /* SVR4 Protocol version */

typedef struct link_map {
        caddr_t          l_addr;        /* Base Address of library */
#ifdef __mips__
        caddr_t          l_offs;        /* Load Offset of library */
#endif
        const char      *l_name;        /* Absolute Path to Library */
        void            *l_ld;          /* Pointer to .dynamic in memory */
        struct link_map *l_next;        /* linked list of mapped libs */
        struct link_map *l_prev;
} Link_map;

/*
 * Debug rendezvous struct. Pointer to this is set up in the
 * target code pointed by the DT_DEBUG tag. If it is
 * defined.
 */
struct r_debug {
        int r_version;                  /* protocol version */
        struct link_map *r_map;         /* list of loaded images */

        /*
         * This is the address of a function internal to the run-time linker,
         * that will always be called when the linker begins to map in a
         * library or unmap it, and again when the mapping change is complete.
         * The debugger can set a breakpoint at this address if it wants to
         * notice shared object mapping changes.
         */
        void (*r_brk)(void);            /* pointer to break point */
        enum {
                /*
                 * This state value describes the mapping change taking place
                 * when the `r_brk' address is called.
                 */
                RT_CONSISTENT,          /* things are stable */
                RT_ADD,                 /* adding a shared library */
                RT_DELETE               /* removing a shared library */
        } r_state;
        void *r_ldbase;                 /* base address of RTLD */
};

struct dl_phdr_info
{
        Elf_Addr dlpi_addr;                     /* module relocation base */
        const char *dlpi_name;                  /* module name */
        const Elf_Phdr *dlpi_phdr;              /* pointer to module's phdr */
        Elf_Half dlpi_phnum;                    /* number of entries in phdr */
        unsigned long long int dlpi_adds;       /* total # of loads */
        unsigned long long int dlpi_subs;       /* total # of unloads */
        size_t dlpi_tls_modid;
        void *dlpi_tls_data;
};

__BEGIN_DECLS

int dl_iterate_phdr(int (*)(struct dl_phdr_info *, size_t, void *),
    void *);

__END_DECLS

#endif  /* _LINK_ELF_H_ */