900d07d6a1
As it turns out, our "generic" arm64 implementations of certain string.h functions are not actually generic, since they will eagerly read memory possibly outside of the bounds of an MTE granule, which may lead to a segfault on MTE-enabled hardware. Therefore, move the implementations into a "default" directory and use ifuncs to select between them and a new set of "mte" implementations, conditional on whether the hardware and kernel support MTE. The MTE implementations are currently naive implementations written in C but will later be replaced with a set of optimized assembly implementations. Bug: 135772972 Change-Id: Ife37c4e0e6fd60ff20a34594cc09c541af4d1dd7
41 lines
1.7 KiB
ArmAsm
41 lines
1.7 KiB
ArmAsm
/*
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* Copyright (C) 2019 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 <private/bionic_asm.h>
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#define FUNCTION_DELEGATE(name, impl) \
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ENTRY(name); \
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b impl; \
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END(name)
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FUNCTION_DELEGATE(memchr, memchr_mte)
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FUNCTION_DELEGATE(strchr, strchr_mte)
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FUNCTION_DELEGATE(strcmp, strcmp_mte)
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FUNCTION_DELEGATE(strlen, strlen_mte)
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FUNCTION_DELEGATE(strncmp, strncmp_mte)
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FUNCTION_DELEGATE(strnlen, strnlen_mte)
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