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