The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 1993 Paul Kranenburg
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by Paul Kranenburg.
   18  * 4. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  *
   32  * $FreeBSD$
   33  */
   34 
   35 /*
   36  * RRS section definitions.
   37  *
   38  * The layout of some data structures defined in this header file is
   39  * such that we can provide compatibility with the SunOS 4.x shared
   40  * library scheme.
   41  */
   42 
   43 #ifndef _SYS_LINK_ELF_H_
   44 #define _SYS_LINK_ELF_H_
   45 
   46 #include <sys/elf.h>
   47 
   48 /*
   49  * Flags that describe the origin of the entries in Dl_serinfo.
   50  * SunOS has these in <sys/link.h>, we follow the suit.
   51  */
   52 #define LA_SER_ORIG     0x01    /* original (needed) name */
   53 #define LA_SER_LIBPATH  0x02    /* LD_LIBRARY_PATH entry prepended */
   54 #define LA_SER_RUNPATH  0x04    /* runpath entry prepended */
   55 #define LA_SER_CONFIG   0x08    /* configuration entry prepended */
   56 #define LA_SER_DEFAULT  0x40    /* default path prepended */
   57 #define LA_SER_SECURE   0x80    /* default (secure) path prepended */
   58 
   59 typedef struct link_map {
   60         caddr_t         l_base;                 /* Base Address of library */
   61         const char      *l_name;                /* Absolute Path to Library */
   62         const void      *l_ld;                  /* Pointer to .dynamic in memory */
   63         struct link_map *l_next, *l_prev;       /* linked list of of mapped libs */
   64         caddr_t         l_addr;                 /* Load Offset of library */
   65         const char      *l_refname;             /* object we are filtering for */
   66 } Link_map;
   67 
   68 struct r_debug {
   69         int             r_version;              /* Currently '1' */
   70         struct link_map *r_map;                 /* list of loaded images */
   71         void            (*r_brk)(struct r_debug *, struct link_map *);
   72                                                 /* pointer to break point */
   73         enum {
   74                 RT_CONSISTENT,                  /* things are stable */
   75                 RT_ADD,                         /* adding a shared library */
   76                 RT_DELETE                       /* removing a shared library */
   77         }               r_state;
   78         void            *r_ldbase;              /* Base address of rtld */
   79 };
   80 
   81 #define R_DEBUG_VERSION         1
   82 
   83 struct dl_phdr_info
   84 {
   85         Elf_Addr dlpi_addr;                     /* module relocation base */
   86         const char *dlpi_name;                  /* module name */
   87         const Elf_Phdr *dlpi_phdr;              /* pointer to module's phdr */
   88         Elf_Half dlpi_phnum;                    /* number of entries in phdr */
   89         unsigned long long int dlpi_adds;       /* total # of loads */
   90         unsigned long long int dlpi_subs;       /* total # of unloads */
   91         size_t dlpi_tls_modid;
   92         void *dlpi_tls_data;
   93 };
   94 
   95 __BEGIN_DECLS
   96 
   97 typedef int (*__dl_iterate_hdr_callback)(struct dl_phdr_info *, size_t, void *);
   98 extern int dl_iterate_phdr(__dl_iterate_hdr_callback, void *);
   99 int _rtld_addr_phdr(const void *, struct dl_phdr_info *);
  100 int _rtld_get_stack_prot(void);
  101 int _rtld_is_dlopened(void *);
  102 
  103 #ifdef __ARM_EABI__
  104 void * dl_unwind_find_exidx(const void *, int *);
  105 #endif
  106 
  107 __END_DECLS
  108 
  109 #endif /* _SYS_LINK_ELF_H_ */

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