66 lines
2.3 KiB
ArmAsm
66 lines
2.3 KiB
ArmAsm
// Copyright 2021 The Crashpad Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#ifndef CRASHPAD_UTIL_MISC_ARM64_PAC_BTI_S
|
|
#define CRASHPAD_UTIL_MISC_ARM64_PAC_BTI_S
|
|
|
|
/* Support macros for the Armv8.5-A Branch Target Identification and
|
|
* Armv8.3-A Pointer Authentication features which require emitting
|
|
* a .note.gnu.property section with the appropriate
|
|
* architecture-dependent feature bits set.
|
|
* Read more: "ELF for the Arm® 64-bit Architecture"
|
|
*/
|
|
#if defined(__ARM_FEATURE_BTI_DEFAULT) && (__ARM_FEATURE_BTI_DEFAULT == 1)
|
|
#define GNU_PROPERTY_AARCH64_BTI 1 // Has BTI
|
|
#define CRASHPAD_AARCH64_VALID_JUMP_CALL_TARGET bti jc
|
|
#define CRASHPAD_AARCH64_VALID_CALL_TARGET bti c
|
|
#define CRASHPAD_AARCH64_VALID_JUMP_TARGET bti j
|
|
#else
|
|
#define GNU_PROPERTY_AARCH64_BTI 0 // No BTI
|
|
#define CRASHPAD_AARCH64_VALID_JUMP_CALL_TARGET
|
|
#define CRASHPAD_AARCH64_VALID_CALL_TARGET
|
|
#define CRASHPAD_AARCH64_VALID_JUMP_TARGET
|
|
#endif
|
|
|
|
#if defined(__ARM_FEATURE_PAC_DEFAULT)
|
|
#if ((__ARM_FEATURE_PAC_DEFAULT & ((1<<0)|(1<<2))) == 0)
|
|
#error Pointer authentication defines no valid key!
|
|
#endif
|
|
#define GNU_PROPERTY_AARCH64_PAC 1 // Has PAC
|
|
#else
|
|
#define GNU_PROPERTY_AARCH64_PAC 0 // No PAC
|
|
#endif
|
|
|
|
/**
|
|
* Emit a proper .note.gnu.property section in case of PAC or BTI being enabled.
|
|
*/
|
|
#if (GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_PAC != 0)
|
|
.pushsection .note.gnu.property, "a"
|
|
.balign 4
|
|
.long 0x4 /* size of field "GNU" */
|
|
.long 0x10 /* note descriptor size */
|
|
.long 0x5 /* type of note descriptor: NT_GNU_PROPERTY_TYPE_0 */
|
|
.asciz "GNU"
|
|
.long 0xc0000000 /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */
|
|
.long 0x4
|
|
.long ((GNU_PROPERTY_AARCH64_BTI<<0)|(GNU_PROPERTY_AARCH64_PAC<<1))
|
|
.long 0x0
|
|
.popsection
|
|
#endif
|
|
|
|
#undef GNU_PROPERTY_AARCH64_BTI
|
|
#undef GNU_PROPERTY_AARCH64_PAC
|
|
|
|
#endif /* CRASHPAD_UTIL_MISC_ARM64_PAC_BTI_S */
|