| 1 | //===-- sanitizer_ptrauth.h -------------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #ifndef SANITIZER_PTRAUTH_H |
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| 10 | #define SANITIZER_PTRAUTH_H |
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| 11 | |
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| 12 | #if __has_feature(ptrauth_calls) |
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| 13 | #include <ptrauth.h> |
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| 14 | #elif defined(__ARM_FEATURE_PAC_DEFAULT) && !defined(__APPLE__) |
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| 15 | inline unsigned long ptrauth_strip(void* __value, unsigned int __key) { |
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| 16 | // On the stack the link register is protected with Pointer |
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| 17 | // Authentication Code when compiled with -mbranch-protection. |
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| 18 | // Let's stripping the PAC unconditionally because xpaclri is in |
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| 19 | // the NOP space so will do nothing when it is not enabled or not available. |
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| 20 | unsigned long ret; |
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| 21 | asm volatile( |
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| 22 | "mov x30, %1\n\t" |
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| 23 | "hint #7\n\t" // xpaclri |
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| 24 | "mov %0, x30\n\t" |
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| 25 | : "=r" (ret) |
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| 26 | : "r" (__value) |
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| 27 | : "x30" ); |
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| 28 | return ret; |
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| 29 | } |
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| 30 | #define ptrauth_auth_data(__value, __old_key, __old_data) __value |
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| 31 | #define ptrauth_string_discriminator(__string) ((int)0) |
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| 32 | #else |
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| 33 | // Copied from <ptrauth.h> |
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| 34 | #define ptrauth_strip(__value, __key) __value |
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| 35 | #define ptrauth_auth_data(__value, __old_key, __old_data) __value |
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| 36 | #define ptrauth_string_discriminator(__string) ((int)0) |
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| 37 | #endif |
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| 38 | |
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| 39 | #define STRIP_PAC_PC(pc) ((uptr)ptrauth_strip(pc, 0)) |
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| 40 | |
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| 41 | #endif // SANITIZER_PTRAUTH_H |
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| 42 | |
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