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Diffstat (limited to 'contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_ptrauth.h')
| -rw-r--r-- | contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_ptrauth.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_ptrauth.h b/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_ptrauth.h new file mode 100644 index 000000000000..265a9925a15a --- /dev/null +++ b/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_ptrauth.h @@ -0,0 +1,43 @@ +//===-- 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_intrinsics) +# include <ptrauth.h> +#elif defined(__ARM_FEATURE_PAC_DEFAULT) && !defined(__APPLE__) +// 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. +# define ptrauth_strip(__value, __key) \ + ({ \ + __typeof(__value) ret; \ + asm volatile( \ + "mov x30, %1\n\t" \ + "hint #7\n\t" \ + "mov %0, x30\n\t" \ + "mov x30, xzr\n\t" \ + : "=r"(ret) \ + : "r"(__value) \ + : "x30"); \ + 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 |