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  * Copyright (c) 1993 Paul Kranenburg
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by Paul Kranenburg.
   16  * 4. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * $FreeBSD: releng/10.2/sys/sys/link_elf.h 276908 2015-01-10 09:22:17Z kib $
   31  */
   32 
   33 /*
   34  * RRS section definitions.
   35  *
   36  * The layout of some data structures defined in this header file is
   37  * such that we can provide compatibility with the SunOS 4.x shared
   38  * library scheme.
   39  */
   40 
   41 #ifndef _SYS_LINK_ELF_H_
   42 #define _SYS_LINK_ELF_H_
   43 
   44 #include <sys/elf.h>
   45 
   46 /*
   47  * Flags that describe the origin of the entries in Dl_serinfo.
   48  * SunOS has these in <sys/link.h>, we follow the suit.
   49  */
   50 #define LA_SER_ORIG     0x01    /* original (needed) name */
   51 #define LA_SER_LIBPATH  0x02    /* LD_LIBRARY_PATH entry prepended */
   52 #define LA_SER_RUNPATH  0x04    /* runpath entry prepended */
   53 #define LA_SER_CONFIG   0x08    /* configuration entry prepended */
   54 #define LA_SER_DEFAULT  0x40    /* default path prepended */
   55 #define LA_SER_SECURE   0x80    /* default (secure) path prepended */
   56 
   57 typedef struct link_map {
   58         caddr_t         l_addr;                 /* Base Address of library */
   59 #ifdef __mips__
   60         caddr_t         l_offs;                 /* Load Offset of library */
   61 #endif
   62         const char      *l_name;                /* Absolute Path to Library */
   63         const void      *l_ld;                  /* Pointer to .dynamic in memory */
   64         struct link_map *l_next, *l_prev;       /* linked list of of mapped libs */
   65 } Link_map;
   66 
   67 struct r_debug {
   68         int             r_version;              /* not used */
   69         struct link_map *r_map;                 /* list of loaded images */
   70         void            (*r_brk)(struct r_debug *, struct link_map *);
   71                                                 /* pointer to break point */
   72         enum {
   73                 RT_CONSISTENT,                  /* things are stable */
   74                 RT_ADD,                         /* adding a shared library */
   75                 RT_DELETE                       /* removing a shared library */
   76         }               r_state;
   77 };
   78 
   79 struct dl_phdr_info
   80 {
   81         Elf_Addr dlpi_addr;                     /* module relocation base */
   82         const char *dlpi_name;                  /* module name */
   83         const Elf_Phdr *dlpi_phdr;              /* pointer to module's phdr */
   84         Elf_Half dlpi_phnum;                    /* number of entries in phdr */
   85         unsigned long long int dlpi_adds;       /* total # of loads */
   86         unsigned long long int dlpi_subs;       /* total # of unloads */
   87         size_t dlpi_tls_modid;
   88         void *dlpi_tls_data;
   89 };
   90 
   91 __BEGIN_DECLS
   92 
   93 typedef int (*__dl_iterate_hdr_callback)(struct dl_phdr_info *, size_t, void *);
   94 extern int dl_iterate_phdr(__dl_iterate_hdr_callback, void *);
   95 int _rtld_addr_phdr(const void *, struct dl_phdr_info *);
   96 int _rtld_get_stack_prot(void);
   97 int _rtld_is_dlopened(void *);
   98 
   99 #ifdef __ARM_EABI__
  100 void * dl_unwind_find_exidx(const void *, int *);
  101 #endif
  102 
  103 __END_DECLS
  104 
  105 #endif /* _SYS_LINK_ELF_H_ */

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