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.
102 lines
3.1 KiB
ArmAsm
102 lines
3.1 KiB
ArmAsm
/*
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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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.text
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.align 4
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.type _start,#function
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.globl _start
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# This is the small startup code that is first run when
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# any static executable runs. A static executable is one
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# that is started directly by the Linux kernel, not from
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# the dynamic linker, it thus cannot depend on any shared
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# library.
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#
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# It's purpose is to call __libc_init as defined in
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# bionic/libc_init_static.c with appropriate
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# arguments, which are:
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#
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# - the address of the raw data block setup by the Linux
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# kernel ELF loader
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#
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# - address of an "onexit" function (not used on any
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# platform supported by Bionic).
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#
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# - address of the "main" function of the program.
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#
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# - address of the constructors table, i.e. a table
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# that points to various initialization and
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# finalization sections for the program.
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#
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_start:
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mov r0, sp
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mov r1, #0
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adr r2, 0f
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adr r3, 1f
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b __libc_init
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0: b main
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# The "C++ ABI for ARM" document that static C++ constructors
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# shall only be called from the .init_array section.
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#
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# Do we really need a .ctors section on ARM platforms ?
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# It looks like it will always be empty.
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#
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1: .long __PREINIT_ARRAY__
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.long __INIT_ARRAY__
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.long __FINI_ARRAY__
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.long __CTOR_LIST__
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# the .ctors section contains a list of pointers to "constructor"
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# functions that need to be called in order during C library initialization,
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# just before the program is being run. This is a C++ requirement
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#
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# the last entry shall be 0, and is defined in crtend.S
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#
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.section .preinit_array, "aw"
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.globl __PREINIT_ARRAY__
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__PREINIT_ARRAY__:
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.long -1
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.section .init_array, "aw"
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.globl __INIT_ARRAY__
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__INIT_ARRAY__:
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.long -1
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.section .fini_array, "aw"
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.globl __FINI_ARRAY__
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__FINI_ARRAY__:
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.long -1
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.section .ctors, "aw"
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.globl __CTOR_LIST__
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__CTOR_LIST__:
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.long -1
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