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8689cf8a27
This allows an ARM64 swift-inspect to correctly read from an ARM64e target process. We compute a ptrauth mask by stripping all bits above MACH_VM_MAX_ADDRESS. This strips more than we strictly need, but it works.
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#if defined(__APPLE__)
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#include <mach/vm_param.h>
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#include <stdint.h>
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#include <ptrauth.h>
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struct CSTypeRef {
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uintptr_t a, b;
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};
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struct Range {
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uintptr_t location, length;
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};
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static inline uintptr_t GetPtrauthMask(void) {
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#if __has_feature(ptrauth_calls)
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return (uintptr_t)ptrauth_strip((void*)0x0007ffffffffffff, 0);
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#elif __arm64__ && __LP64__
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// Mask all bits above the top of MACH_VM_MAX_ADDRESS, which will
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// match the above ptrauth_strip.
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return (uintptr_t)~0ull >> __builtin_clzll(MACH_VM_MAX_ADDRESS);
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#else
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return (uintptr_t)~0ull;
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#endif
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}
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#endif
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