4d06786ea8
I don't think we need this, and we're not doing it for the equivalent code in riscv64. So either we do need it, and this will help us find out quicker and make the corresponding riscv64 change, or we don't need it, and this is a free cleanup. Test: treehugger Change-Id: Ie97492ea8bb4d1bc69f926980d9d4db798884285
67 lines
3 KiB
C++
67 lines
3 KiB
C++
/*
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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_call_ifunc_resolver.h"
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#include <sys/auxv.h>
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#include <sys/ifunc.h>
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#include "bionic/macros.h"
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#include "private/bionic_auxv.h"
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// This code is called in the linker before it has been relocated, so minimize calls into other
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// parts of Bionic. In particular, we won't ever have two ifunc resolvers called concurrently, so
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// initializing the ifunc resolver argument doesn't need to be thread-safe.
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ElfW(Addr) __bionic_call_ifunc_resolver(ElfW(Addr) resolver_addr) {
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#if defined(__aarch64__)
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typedef ElfW(Addr) (*ifunc_resolver_t)(uint64_t, __ifunc_arg_t*);
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BIONIC_USED_BEFORE_LINKER_RELOCATES static __ifunc_arg_t arg;
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BIONIC_USED_BEFORE_LINKER_RELOCATES static bool initialized = false;
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if (!initialized) {
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initialized = true;
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arg._size = sizeof(__ifunc_arg_t);
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arg._hwcap = getauxval(AT_HWCAP);
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arg._hwcap2 = getauxval(AT_HWCAP2);
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}
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return reinterpret_cast<ifunc_resolver_t>(resolver_addr)(arg._hwcap | _IFUNC_ARG_HWCAP, &arg);
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#elif defined(__arm__)
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typedef ElfW(Addr) (*ifunc_resolver_t)(unsigned long);
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static unsigned long hwcap = getauxval(AT_HWCAP);
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return reinterpret_cast<ifunc_resolver_t>(resolver_addr)(hwcap);
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#elif defined(__riscv)
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// The pointer argument is currently unused, but reserved for future
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// expansion. If we pass nullptr from the beginning, it'll be easier
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// to recognize if/when we pass actual data (and matches glibc).
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typedef ElfW(Addr) (*ifunc_resolver_t)(uint64_t, void*);
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static uint64_t hwcap = getauxval(AT_HWCAP);
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return reinterpret_cast<ifunc_resolver_t>(resolver_addr)(hwcap, nullptr);
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#else
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typedef ElfW(Addr) (*ifunc_resolver_t)(void);
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return reinterpret_cast<ifunc_resolver_t>(resolver_addr)();
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#endif
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}
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