6835d019b2
This patch adds support for handling return addresses signed with
pointer authentication. It simply strips the authentication code
without verifying its correctness, and thus works with both A and B
keys and through key-change boundaries.
Additons:
* DW_CFA_AARCH64_negate_ra_state: new CFA operation.
* RA_SIGN_STATE: new pseudo register.
* Pass the arch to DwarfCfa so that the new op is only executed
on aarch64.
The stripping uses the xpaclri instruction. This is a hint space
instruction which is compatible with pre Armv8.3-A devices. For cases
where it cannot be used, a mask can be set instead.
Test: libunwindstack_test
Without this patch all UnwindTest.* testcases should fail if
compiled with Pointer Authentication.
The tests should be executed with both -mbranch-protection=pac-ret and
pac-ret+leaf flags so that either some or all functions have pointer
authentication instructions.
Change-Id: Id7c3f1d0e2fc7fccb19bd1430826264405a9df7c
54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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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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*/
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#ifndef _LIBUNWINDSTACK_DWARF_LOCATION_H
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#define _LIBUNWINDSTACK_DWARF_LOCATION_H
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#include <stdint.h>
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#include <unordered_map>
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namespace unwindstack {
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struct DwarfCie;
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enum DwarfLocationEnum : uint8_t {
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DWARF_LOCATION_INVALID = 0,
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DWARF_LOCATION_UNDEFINED,
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DWARF_LOCATION_OFFSET,
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DWARF_LOCATION_VAL_OFFSET,
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DWARF_LOCATION_REGISTER,
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DWARF_LOCATION_EXPRESSION,
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DWARF_LOCATION_VAL_EXPRESSION,
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DWARF_LOCATION_PSEUDO_REGISTER,
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};
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struct DwarfLocation {
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DwarfLocationEnum type;
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uint64_t values[2];
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};
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struct DwarfLocations : public std::unordered_map<uint32_t, DwarfLocation> {
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const DwarfCie* cie;
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// The range of PCs where the locations are valid (end is exclusive).
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uint64_t pc_start = 0;
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uint64_t pc_end = 0;
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};
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typedef DwarfLocations dwarf_loc_regs_t;
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_DWARF_LOCATION_H
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