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3869 svoboda 1
/*
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 * Copyright (c) 2008 Jiri Svoboda
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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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 *
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 * - 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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 * - 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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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup rtld
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 * @brief   Test dynamic linking capabilities.
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 * @{
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 */
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/**
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 * @file
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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static void kputint(unsigned i)
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{
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//  unsigned dummy;
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//  asm volatile (
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//      "movl $30, %%eax;"
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//      "int $0x30"
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//      : "=d" (dummy) /* output - %edx clobbered */
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//      : "d" (i) /* input */
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//      : "%eax","%ecx" /* all scratch registers clobbered */
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//  );
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/*
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    asm volatile (
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        "mr %%r3, %0\n"
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        "li %%r9, 32\n"
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        "sc\n"
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        :
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        : "r" (i)
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        : "%r3","%r9"
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    );
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*/
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}
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typedef int (*fptr_t)(void);
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int main(int argc, char *argv[])
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{
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    void *a;
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    void *s;
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    fptr_t fun;
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    int i;
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    char *lib_name;
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    char *sym_name;
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//  kputint(-1);
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    printf("Hello from dltest!\n");
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    lib_name = "libtest.so.0";
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    sym_name = "test_func";
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    a = dlopen(lib_name, 0);
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    if (a != NULL) {
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        s = dlsym(a, sym_name);
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        printf("symbol '%s' = 0x%lx\n", sym_name, (long) s);
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    } else {
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        printf("failed to dlopen() library '%s'\n", lib_name);
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    }
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    printf("Run dynamically-resolved function '%s'...\n", sym_name);
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    fun = (fptr_t) s;
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    i = (*fun)();
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    printf("Done. (returned 0x%x)\n", i);
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    return 0;
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}
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/** @}
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 */
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