FreeBSD/Linux Kernel Cross Reference
sys/sys/link_elf.h

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * Copyright (c) 1993 Paul Kranenburg
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Paul Kranenburg.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD: releng/12.0/sys/sys/link_elf.h 326256 2017-11-27 15:01:59Z pfg $
     */
    
    /*
     * RRS section definitions.
     *
     * The layout of some data structures defined in this header file is
     * such that we can provide compatibility with the SunOS 4.x shared
     * library scheme.
     */
    
    #ifndef _SYS_LINK_ELF_H_
    #define _SYS_LINK_ELF_H_
    
    #include <sys/elf.h>
    
    /*
     * Flags that describe the origin of the entries in Dl_serinfo.
     * SunOS has these in <sys/link.h>, we follow the suit.
     */
    #define LA_SER_ORIG     0x01    /* original (needed) name */
    #define LA_SER_LIBPATH  0x02    /* LD_LIBRARY_PATH entry prepended */
    #define LA_SER_RUNPATH  0x04    /* runpath entry prepended */
    #define LA_SER_CONFIG   0x08    /* configuration entry prepended */
    #define LA_SER_DEFAULT  0x40    /* default path prepended */
    #define LA_SER_SECURE   0x80    /* default (secure) path prepended */
    
    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 */
            const void      *l_ld;                  /* Pointer to .dynamic in memory */
            struct link_map *l_next, *l_prev;       /* linked list of of mapped libs */
    } Link_map;
    
    struct r_debug {
            int             r_version;              /* not used */
            struct link_map *r_map;                 /* list of loaded images */
            void            (*r_brk)(struct r_debug *, struct link_map *);
                                                    /* pointer to break point */
            enum {
                    RT_CONSISTENT,                  /* things are stable */
                    RT_ADD,                         /* adding a shared library */
                    RT_DELETE                       /* removing a shared library */
            }               r_state;
    };
    
    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
    
    typedef int (*__dl_iterate_hdr_callback)(struct dl_phdr_info *, size_t, void *);
    extern int dl_iterate_phdr(__dl_iterate_hdr_callback, void *);
    int _rtld_addr_phdr(const void *, struct dl_phdr_info *);
    int _rtld_get_stack_prot(void);
    int _rtld_is_dlopened(void *);
   
   #ifdef __ARM_EABI__
   void * dl_unwind_find_exidx(const void *, int *);
   #endif
   
   __END_DECLS
   
   #endif /* _SYS_LINK_ELF_H_ */

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