xref: /aosp_15_r20/bionic/libc/arch-arm/bionic/exidx_dynamic.c (revision 8d67ca893c1523eb926b9080dbe4e2ffd2a27ba1)

/*
 * Copyright (C) 2008 The Android Open Source Project
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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
 * COPYRIGHT OWNER OR CONTRIBUTORS 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.
 */

#include <link.h>

/* For a given PC, find the .so that it belongs to.
 * Returns the base address of the .ARM.exidx section
 * for that .so, and the number of 8-byte entries
 * in that section (via *pcount).
 *
 * libgcc declares __gnu_Unwind_Find_exidx() as a weak symbol, with
 * the expectation that libc will define it and call through to
 * a differently-named function in the dynamic linker.
 */
_Unwind_Ptr __gnu_Unwind_Find_exidx_impl(_Unwind_Ptr pc, int *pcount) {
    return dl_unwind_find_exidx(pc, pcount);
}

_Unwind_Ptr __gnu_Unwind_Find_exidx_impl2(_Unwind_Ptr pc, int *pcount) {
    return dl_unwind_find_exidx(pc, pcount);
}

__asm__(".symver __gnu_Unwind_Find_exidx_impl,__gnu_Unwind_Find_exidx@LIBC_PRIVATE");
__asm__(".symver __gnu_Unwind_Find_exidx_impl2,__gnu_Unwind_Find_exidx@@LIBC_N");