03eabfe65e
The problem was due to the fact that, in the case of dynamic executables, the dynamic linker calls the DT_PREINIT_ARRAY, DT_INIT and DT_INIT_ARRAY constructors when loading shared libraries and dynamic executables, *before* calling the executable's entry point (i.e. arch-$ARCH/bionic/crtbegin_dynamic.c) which in turns call __libc_init() in libc.so, as defined by bionic/libc_init_dynamic.c The latter did call these constructors array again, mistakenly. The patch also updates the documentation of many related functions. Also adds a new section to linker/README.TXT explaining restrictions on C library usage. The patch has been tested on a Dream for stability issues with proprietary blobs: - H264 decoding works - Camera + Video recording works - GPS works - Sensors work The tests in system/extra/tests/bionic/libc/common/test_static_cpp_mutex.cpp has been run and shows the static C++ constructor being called only once.
77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
/*
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* Copyright (C) 2009 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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#ifndef _BIONIC_PREINIT_H
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#define _BIONIC_PREINIT_H
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#include "pthread_internal.h"
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#include "bionic_tls.h"
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#include <asm/page.h>
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/* this function is used to perform a minimal initialization of the
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* the C library. This must be performed before any other call to
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* other functions, in either the dynamic linker's startup code
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* or libc_init_static.c
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*
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* 'main_thread' and 'tls_area' must be persistent variables,
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* which means they must be either global, or allocated in the
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* main thread's stack frame and never, ever, freed before
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* program exit.
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*
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* VERY IMPORTANT NOTE:
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*
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* THIS IMPLEMENTATION SHOULD NOT USE GLOBAL VARIABLES.
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*
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* The reason is the dynamic linker's tricky usage of C library
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* functions and later renaming of their symbols. See the
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* "C Library Usage Restriction" section in bionic/linker/README.TXT
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* for details.
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*/
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extern unsigned __get_sp(void);
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extern pid_t gettid(void);
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static __inline__ void
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__libc_preinit( pthread_internal_t* main_thread,
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void* tls_area[BIONIC_TLS_SLOTS] )
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{
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pthread_attr_t thread_attr;
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/* Setup the main thread's information */
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unsigned stacktop = (__get_sp() & ~(PAGE_SIZE - 1)) + PAGE_SIZE;
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unsigned stacksize = 128 * 1024;
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unsigned stackbottom = stacktop - stacksize;
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pthread_attr_init(&thread_attr);
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pthread_attr_setstack(&thread_attr, (void*)stackbottom, stacksize);
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_init_thread(main_thread, gettid(), &thread_attr, (void*)stackbottom);
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__init_tls(tls_area, main_thread);
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}
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#endif /* _BIONIC_INIT_H */
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