source: mainline/uspace/app/dltest2/dltest2.c@ 5b72635

/*
 * Copyright (c) 2008 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup rtld
 * @brief       Test dynamic linking capabilities.
 * @{
 */ 
/**
 * @file
 */

#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>

static void kputint(unsigned i)
{
//      unsigned dummy;
//      asm volatile (
//              "movl $30, %%eax;"
//              "int $0x30"
//              : "=d" (dummy) /* output - %edx clobbered */
//              : "d" (i) /* input */
//              : "%eax","%ecx" /* all scratch registers clobbered */
//      );
/*
        asm volatile (
                "mr %%r3, %0\n"
                "li %%r9, 32\n"
                "sc\n"
                :
                : "r" (i)
                : "%r3","%r9"
        );
*/
}

typedef int (*fptr_t)(void);

int main(int argc, char *argv[])
{
        void *a;
        void *s;
        fptr_t fun;
        int i;

        const char *lib_name;
        const char *sym_name;

        if (0) kputint(-1);
        printf("Hello from dltest!\n");

        lib_name = "libtest.so.0";
        sym_name = "test_func";

        a = dlopen(lib_name, 0);
        if (a != NULL) {
                s = dlsym(a, sym_name);
                printf("symbol '%s' = 0x%lx\n", sym_name, (long) s);
        } else {
                printf("failed to dlopen() library '%s'\n", lib_name);
                return -1;
        }

        printf("Run dynamically-resolved function '%s'...\n", sym_name);
        fun = (fptr_t) s;
        i = (*fun)();
        printf("Done. (returned 0x%x)\n", i);
        
        return 0;
}

/** @}
 */