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/*
* Copyright (C) 2018-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/PlatformRegisters.h>
#include <wtf/PtrTag.h>
namespace WTF {
#if USE(PLATFORM_REGISTERS_WITH_PROFILE) && CPU(ARM64E)
#define USE_UNTAGGED_THREAD_STATE_PTR 1
void* threadStateLRInternal(PlatformRegisters& regs)
{
void* candidateLR = arm_thread_state64_get_lr_fptr(regs);
#if USE(UNTAGGED_THREAD_STATE_PTR)
if (candidateLR && isTaggedWith<CFunctionPtrTag>(candidateLR))
return retagCodePtr<CFunctionPtrTag, PlatformRegistersLRPtrTag>(candidateLR);
candidateLR = std::bit_cast<void*>(arm_thread_state64_get_lr(regs));
if (!candidateLR)
return candidateLR;
return tagCodePtr<PlatformRegistersLRPtrTag>(candidateLR);
#else
return retagCodePtr<CFunctionPtrTag, PlatformRegistersLRPtrTag>(candidateLR);
#endif
}
void* threadStatePCInternal(PlatformRegisters& regs)
{
#if CPU(ARM64E) && HAVE(HARDENED_MACH_EXCEPTIONS)
// If we have modified the PC and set it to a presigned function we want to avoid
// authing the value as it is using a custom ptrauth signing scheme.
_STRUCT_ARM_THREAD_STATE64* ts = &(regs);
if (!(ts->__opaque_flags & __DARWIN_ARM_THREAD_STATE64_FLAGS_KERNEL_SIGNED_PC))
return nullptr;
#endif // CPU(ARM64E) && HAVE(HARDENED_MACH_EXCEPTIONS)
void* candidatePC = arm_thread_state64_get_pc_fptr(regs);
#if USE(UNTAGGED_THREAD_STATE_PTR)
if (candidatePC && isTaggedWith<CFunctionPtrTag>(candidatePC))
return retagCodePtr<CFunctionPtrTag, PlatformRegistersPCPtrTag>(candidatePC);
candidatePC = std::bit_cast<void*>(arm_thread_state64_get_pc(regs));
if (!candidatePC)
return candidatePC;
return tagCodePtr<PlatformRegistersPCPtrTag>(candidatePC);
#else
return retagCodePtr<CFunctionPtrTag, PlatformRegistersPCPtrTag>(candidatePC);
#endif
}
#endif // USE(PLATFORM_REGISTERS_WITH_PROFILE) && CPU(ARM64E)
} // namespace WTF
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