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/kern/linker_if.m

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    1 #-
    2 # Copyright (c) 2000 Doug Rabson
    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 #
   14 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17 # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24 # SUCH DAMAGE.
   25 #
   26 # $FreeBSD$
   27 #
   28 
   29 #include <sys/linker.h>
   30 
   31 INTERFACE linker;
   32 
   33 #
   34 # Lookup a symbol in the file's symbol table.  If the symbol is not
   35 # found then return ENOENT, otherwise zero.
   36 #
   37 METHOD int lookup_symbol {
   38     linker_file_t       file;
   39     const char*         name;
   40     c_linker_sym_t*     symp;
   41 };
   42 
   43 METHOD int symbol_values {
   44     linker_file_t       file;
   45     c_linker_sym_t      sym;
   46     linker_symval_t*    valp;
   47 };
   48 
   49 METHOD int search_symbol {
   50     linker_file_t       file;
   51     caddr_t             value;
   52     c_linker_sym_t*     symp;
   53     long*               diffp;
   54 };
   55 
   56 #
   57 # Call the callback with each specified function defined in the file.
   58 # Stop and return the error if the callback returns an error.
   59 #
   60 METHOD int each_function_name {
   61         linker_file_t   file;
   62         linker_function_name_callback_t callback;
   63         void*           opaque;
   64 };
   65 
   66 #
   67 # Search for a linker set in a file.  Return a pointer to the first
   68 # entry (which is itself a pointer), and the number of entries.
   69 # "stop" points to the entry beyond the last valid entry.
   70 # If count, start or stop are NULL, they are not returned.
   71 #
   72 METHOD int lookup_set {
   73     linker_file_t       file;
   74     const char*         name;
   75     void***             start;
   76     void***             stop;
   77     int*                count;
   78 };
   79 
   80 #
   81 # Unload a file, releasing dependancies and freeing storage.
   82 #
   83 METHOD void unload {
   84     linker_file_t       file;
   85 };
   86 
   87 #
   88 # Load a file, returning the new linker_file_t in *result.  If
   89 # the class does not recognise the file type, zero should be
   90 # returned, without modifying *result.  If the file is
   91 # recognised, the file should be loaded, *result set to the new
   92 # file and zero returned.  If some other error is detected an
   93 # appropriate errno should be returned.
   94 #
   95 STATICMETHOD int load_file {
   96     linker_class_t      cls;
   97     const char*         filename;
   98     linker_file_t*      result;
   99 };
  100 STATICMETHOD int link_preload {
  101     linker_class_t      cls;
  102     const char*         filename;
  103     linker_file_t*      result;
  104 };
  105 METHOD int link_preload_finish {
  106     linker_file_t       file;
  107 };

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