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Implement __gnu_[u]ldivmod_helper methods in libc

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These symbols were previously provided by Android's out-dated libgcc,
but they're removed/deprecated in upstream libgcc, and also won't be
available in libclang_rt.builtins. We need to provide these methods in
libc itself for compatiblity.

Test: build with these symbols stripped in libgcc
Bug: 29275768
Change-Id: I04a05258c6c06b5a22ead41e148b02792ffbc941
This commit is contained in:
Yi Kong 2019-04-22 16:00:46 -07:00
parent b250766282
commit b410d0e69e
2 changed files with 46 additions and 2 deletions
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5
libc/Android.bp
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@ -762,12 +762,13 @@ cc_library_static {
"arch-arm/generic/bionic/strlen.c", "arch-arm/generic/bionic/strlen.c",
"arch-arm/bionic/__aeabi_read_tp.S", "arch-arm/bionic/__aeabi_read_tp.S",
"arch-arm/bionic/atomics_arm.c",
"arch-arm/bionic/__bionic_clone.S", "arch-arm/bionic/__bionic_clone.S",
"arch-arm/bionic/__restore.S",
"arch-arm/bionic/_exit_with_stack_teardown.S", "arch-arm/bionic/_exit_with_stack_teardown.S",
"arch-arm/bionic/atomics_arm.c",
"arch-arm/bionic/bpabi.c",
"arch-arm/bionic/libcrt_compat.c", "arch-arm/bionic/libcrt_compat.c",
"arch-arm/bionic/popcount_tab.c", "arch-arm/bionic/popcount_tab.c",
"arch-arm/bionic/__restore.S",
"arch-arm/bionic/setjmp.S", "arch-arm/bionic/setjmp.S",
"arch-arm/bionic/syscall.S", "arch-arm/bionic/syscall.S",
"arch-arm/bionic/vfork.S", "arch-arm/bionic/vfork.S",

43
libc/arch-arm/bionic/bpabi.c Normal file
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@ -0,0 +1,43 @@
/*
* Copyright (C) 2019 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.
*/
extern long long __divdi3(long long, long long);
extern unsigned long long __udivdi3(unsigned long long, unsigned long long);
long long __gnu_ldivmod_helper(long long a, long long b, long long* remainder) {
long long quotient = __divdi3(a, b);
*remainder = a - b * quotient;
return quotient;
}
unsigned long long __gnu_uldivmod_helper(unsigned long long a, unsigned long long b,
unsigned long long* remainder) {
unsigned long long quotient = __udivdi3(a, b);
*remainder = a - b * quotient;
return quotient;
}