forked from LeenkxTeam/Kmake
58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
// Copyright 2025 The Abseil Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_DEBUGGING_INTERNAL_ADDRESSES_H_
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#define ABSL_DEBUGGING_INTERNAL_ADDRESSES_H_
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#include <stdint.h>
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#include "absl/base/config.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace debugging_internal {
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// Removes any metadata (tag bits) from the given pointer, converting it into a
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// user-readable address.
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inline uintptr_t StripPointerMetadata(uintptr_t ptr) {
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#if defined(__aarch64__)
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// When PAC-RET (-mbranch-protection=pac-ret) is enabled, return addresses
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// stored on the stack will be signed, which means that pointer bits outside
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// of the virtual address range are potentially set. Since the stacktrace code
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// is expected to return normal code pointers, this function clears those
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// bits.
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register uintptr_t x30 __asm__("x30") = ptr;
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// The normal instruction for clearing PAC bits is XPACI, but for
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// compatibility with ARM platforms that do not support pointer
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// authentication, we use the hint space instruction XPACLRI instead. Hint
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// space instructions behave as NOPs on unsupported platforms.
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#define ABSL_XPACLRI_HINT "hint #0x7;"
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asm(ABSL_XPACLRI_HINT : "+r"(x30)); // asm("xpaclri" : "+r"(x30));
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#undef ABSL_XPACLRI_HINT
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return x30;
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#else
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return ptr;
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#endif
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}
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inline uintptr_t StripPointerMetadata(void* ptr) {
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return StripPointerMetadata(reinterpret_cast<uintptr_t>(ptr));
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}
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} // namespace debugging_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_DEBUGGING_INTERNAL_ADDRESSES_H_
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