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f41325db5f
Replace the a.out emulation of 'struct linker_set' with something a little more flexible. <sys/linker_set.h> now provides macros for accessing elements and completely hides the implementation. The linker_set.h macros have been on the back burner in various forms since 1998 and has ideas and code from Mike Smith (SET_FOREACH()), John Polstra (ELF clue) and myself (cleaned up API and the conversion of the rest of the kernel to use it). The macros declare a strongly typed set. They return elements with the type that you declare the set with, rather than a generic void *. For ELF, we use the magic ld symbols (__start_<setname> and __stop_<setname>). Thanks to Richard Henderson <rth@redhat.com> for the trick about how to force ld to provide them for kld's. For a.out, we use the old linker_set struct. NOTE: the item lists are no longer null terminated. This is why the code impact is high in certain areas. The runtime linker has a new method to find the linker set boundaries depending on which backend format is in use. linker sets are still module/kld unfriendly and should never be used for anything that may be modular one day. Reviewed by: eivind
98 lines
2.9 KiB
Objective-C
98 lines
2.9 KiB
Objective-C
#
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# Copyright (c) 2000 Doug Rabson
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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#include <sys/linker.h>
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INTERFACE linker;
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#
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# Lookup a symbol in the file's symbol table. If the symbol is not
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# found then return ENOENT, otherwise zero.
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#
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METHOD int lookup_symbol {
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linker_file_t file;
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const char* name;
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c_linker_sym_t* symp;
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};
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METHOD int symbol_values {
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linker_file_t file;
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c_linker_sym_t sym;
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linker_symval_t* valp;
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};
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METHOD int search_symbol {
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linker_file_t file;
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caddr_t value;
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c_linker_sym_t* symp;
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long* diffp;
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};
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#
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# Search for a linker set in a file. Return a pointer to the first
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# entry (which is itself a pointer), and the number of entries.
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# "stop" points to the entry beyond the last valid entry.
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# If count, start or stop are NULL, they are not returned.
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#
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METHOD int lookup_set {
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linker_file_t file;
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const char* name;
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void*** start;
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void*** stop;
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int* count;
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};
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#
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# Unload a file, releasing dependancies and freeing storage.
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#
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METHOD void unload {
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linker_file_t file;
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};
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#
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# Load a file, returning the new linker_file_t in *result. If
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# the class does not recognise the file type, zero should be
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# returned, without modifying *result. If the file is
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# recognised, the file should be loaded, *result set to the new
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# file and zero returned. If some other error is detected an
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# appropriate errno should be returned.
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#
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STATICMETHOD int load_file {
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linker_class_t cls;
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const char* filename;
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linker_file_t* result;
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};
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STATICMETHOD int link_preload {
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linker_class_t cls;
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const char* filename;
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linker_file_t* result;
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};
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STATICMETHOD int link_preload_finish {
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linker_file_t file;
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};
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