7b89be78f4
Bug: http://b/157081822 If __libc_int0x80 is in a C/C++ file, Clang's coverage instrumentation adds instructions to count the number of times it gets executed [1]. With coverage instrumentation, __libc_sysinfo, used on 32-bit x86, is initialized to the wrong value, causing dl.preinit_system_calls to fail. Moving the function to an assembly file leaves __libc_sysinfo properly initialized. [1] We could change clang so it doesn't instrument functions marked __attribute__((naked)) as a followup. Test: `m CLANG_COVERAGE=true NATIVE_COVERAGE_PATHS=bionic` and run bionic-unit-tests Change-Id: I73558253512392d345de8d5b66d38bb14b308fdf
43 lines
1.8 KiB
C++
43 lines
1.8 KiB
C++
/*
|
|
* 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 "private/bionic_auxv.h"
|
|
#include "private/bionic_globals.h"
|
|
|
|
// This file is compiled without stack protection, because it runs before TLS
|
|
// has been set up.
|
|
|
|
__LIBC_HIDDEN__ void __libc_init_sysinfo() {
|
|
bool unused;
|
|
__libc_sysinfo = reinterpret_cast<void*>(__bionic_getauxval(AT_SYSINFO, &unused));
|
|
}
|
|
|
|
// TODO: lose this function and just access __libc_sysinfo directly.
|
|
__LIBC_HIDDEN__ extern "C" void* __kernel_syscall() {
|
|
return __libc_sysinfo;
|
|
}
|