2019-03-20 23:32:26 +00:00
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/*
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* Copyright (C) 2018-2019 Apple Inc. 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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/PlatformRegisters.h>
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#include <wtf/PtrTag.h>
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namespace WTF {
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#if USE(PLATFORM_REGISTERS_WITH_PROFILE) && CPU(ARM64E)
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#define USE_UNTAGGED_THREAD_STATE_PTR 1
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void* threadStateLRInternal(PlatformRegisters& regs)
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{
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void* candidateLR = arm_thread_state64_get_lr_fptr(regs);
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#if USE(UNTAGGED_THREAD_STATE_PTR)
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2020-10-09 05:08:11 +00:00
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if (candidateLR && isTaggedWith<CFunctionPtrTag>(candidateLR))
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2019-03-20 23:32:26 +00:00
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return retagCodePtr<CFunctionPtrTag, PlatformRegistersLRPtrTag>(candidateLR);
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candidateLR = bitwise_cast<void*>(arm_thread_state64_get_lr(regs));
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if (!candidateLR)
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return candidateLR;
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return tagCodePtr<PlatformRegistersLRPtrTag>(candidateLR);
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#else
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return retagCodePtr<CFunctionPtrTag, PlatformRegistersLRPtrTag>(candidateLR);
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#endif
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}
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void* threadStatePCInternal(PlatformRegisters& regs)
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{
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void* candidatePC = arm_thread_state64_get_pc_fptr(regs);
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#if USE(UNTAGGED_THREAD_STATE_PTR)
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2020-10-09 05:08:11 +00:00
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if (candidatePC && isTaggedWith<CFunctionPtrTag>(candidatePC))
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2019-03-20 23:32:26 +00:00
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return retagCodePtr<CFunctionPtrTag, PlatformRegistersPCPtrTag>(candidatePC);
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candidatePC = bitwise_cast<void*>(arm_thread_state64_get_pc(regs));
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if (!candidatePC)
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return candidatePC;
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return tagCodePtr<PlatformRegistersPCPtrTag>(candidatePC);
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#else
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return retagCodePtr<CFunctionPtrTag, PlatformRegistersPCPtrTag>(candidatePC);
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#endif
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}
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#endif // USE(PLATFORM_REGISTERS_WITH_PROFILE) && CPU(ARM64E)
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} // namespace WTF
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