aeb5bc658f
__exidx_start and __exidx_end are not actual values to be read, just
symbols placed before and after .ARM.exidx.
The default linker script for ARM static executables includes these
lines:
__exidx_start = .;
.ARM.exidx : { *(.ARM.exidx*) }
__exidx_end = .;
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0474c/BABEHEDA.html
Test: used __gnu_Unwind_Find_exidx in a static executable and showed
non-bogus values
Test: verified that this fixes #593 in the NDK
Bug: https://github.com/android-ndk/ndk/issues/593
Change-Id: Ib35a4b6c82920666ae8a45aa0a2d43e458699b51
44 lines
1.9 KiB
C
44 lines
1.9 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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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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* * 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
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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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#include <link.h>
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/* Find the .ARM.exidx section (which in the case of a static executable
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* can be identified through its start and end symbols), and return its
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* beginning and number of entries to the caller. Note that for static
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* executables we do not need to use the value of the PC to find the
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* EXIDX section.
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*/
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extern unsigned __exidx_end;
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extern unsigned __exidx_start;
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_Unwind_Ptr __gnu_Unwind_Find_exidx(_Unwind_Ptr pc __attribute__((unused)), int* pcount) {
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*pcount = (&__exidx_end - &__exidx_start) / 8;
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return (_Unwind_Ptr)&__exidx_start;
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}
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