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fe19de6e1d
Change-Id: Ic9c2d252829a39b0331e436df16effe7d0607996 Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3241142 Commit-Queue: Jonathan Wright <jonathan.wright@arm.com> Reviewed-by: Joshua Peraza <jperaza@chromium.org>
47 lines
1.8 KiB
ArmAsm
47 lines
1.8 KiB
ArmAsm
// Copyright 2021 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef CRASHPAD_UTIL_MISC_ARM64_BTI_NOTE_S
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#define CRASHPAD_UTIL_MISC_ARM64_BTI_NOTE_S
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/* Support macros for the Armv8.5-A Branch Target Identification feature which
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* requires emitting a .note.gnu.property section with the appropriate
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* architecture-dependent feature bits set.
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* Read more: "ELF for the Arm® 64-bit Architecture"
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*/
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#if defined(__ARM_FEATURE_BTI_DEFAULT) && (__ARM_FEATURE_BTI_DEFAULT == 1)
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#define GNU_PROPERTY_AARCH64_BTI (1 << 0) // Has BTI
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.pushsection .note.gnu.property, "a"
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.balign 4
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.long 0x4 /* size of field "GNU" */
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.long 0x10 /* note descriptor size */
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.long 0x5 /* type of note descriptor: NT_GNU_PROPERTY_TYPE_0 */
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.asciz "GNU"
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.long 0xc0000000 /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */
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.long 0x4
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.long GNU_PROPERTY_AARCH64_BTI
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.long 0x0
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.popsection
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#define CRASHPAD_AARCH64_VALID_JUMP_CALL_TARGET bti jc
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#define CRASHPAD_AARCH64_VALID_CALL_TARGET bti c
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#define CRASHPAD_AARCH64_VALID_JUMP_TARGET bti j
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#undef GNU_PROPERTY_AARCH64_BTI
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#else
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#define CRASHPAD_AARCH64_VALID_JUMP_CALL_TARGET
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#define CRASHPAD_AARCH64_VALID_CALL_TARGET
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#define CRASHPAD_AARCH64_VALID_JUMP_TARGET
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#endif
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#endif /* CRASHPAD_UTIL_MISC_ARM64_BTI_NOTE_S */
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