derek.holloway
7502bf64a4
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44 lines
1.7 KiB
C++
44 lines
1.7 KiB
C++
//===-- sanitizer_ptrauth.h -------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_PTRAUTH_H
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#define SANITIZER_PTRAUTH_H
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#if __has_feature(ptrauth_intrinsics)
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# include <ptrauth.h>
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#elif defined(__ARM_FEATURE_PAC_DEFAULT) && !defined(__APPLE__)
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// On the stack the link register is protected with Pointer
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// Authentication Code when compiled with -mbranch-protection.
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// Let's stripping the PAC unconditionally because xpaclri is in
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// the NOP space so will do nothing when it is not enabled or not available.
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# define ptrauth_strip(__value, __key) \
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({ \
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__typeof(__value) ret; \
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asm volatile( \
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"mov x30, %1\n\t" \
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"hint #7\n\t" \
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"mov %0, x30\n\t" \
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"mov x30, xzr\n\t" \
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: "=r"(ret) \
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: "r"(__value) \
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: "x30"); \
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ret; \
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})
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# define ptrauth_auth_data(__value, __old_key, __old_data) __value
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# define ptrauth_string_discriminator(__string) ((int)0)
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#else
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// Copied from <ptrauth.h>
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# define ptrauth_strip(__value, __key) __value
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# define ptrauth_auth_data(__value, __old_key, __old_data) __value
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# define ptrauth_string_discriminator(__string) ((int)0)
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#endif
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#define STRIP_PAC_PC(pc) ((uptr)ptrauth_strip(pc, 0))
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#endif // SANITIZER_PTRAUTH_H
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