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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>
69 lines
2.7 KiB
ArmAsm
69 lines
2.7 KiB
ArmAsm
// Copyright 2018 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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// This note section is used on ELF platforms to give ElfImageReader a method
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// of finding the instance of CrashpadInfo g_crashpad_info without requiring
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// that symbol to be in the dynamic symbol table.
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#include "util/misc/elf_note_types.h"
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#include "util/misc/arm64_bti_note.S"
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// namespace crashpad {
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// CrashpadInfo g_crashpad_info;
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// } // namespace crashpad
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#define CRASHPAD_INFO_SYMBOL _ZN8crashpad15g_crashpad_infoE
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#define NOTE_ALIGN 4
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// This section must be "a"llocated so that it appears in the final binary at
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// runtime. The reference to CRASHPAD_INFO_SYMBOL uses an offset relative to
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// this note to avoid making this note writable, which triggers a bug in GNU
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// ld, or adding text relocations which require the target system to allow
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// making text segments writable. https://crbug.com/crashpad/260.
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.section .note.crashpad.info,"a",%note
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.balign NOTE_ALIGN
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CRASHPAD_NOTE:
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.long name_end - name // namesz
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.long desc_end - desc // descsz
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.long CRASHPAD_ELF_NOTE_TYPE_CRASHPAD_INFO // type
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name:
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.asciz CRASHPAD_ELF_NOTE_NAME
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name_end:
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.balign NOTE_ALIGN
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desc:
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#if defined(__LP64__)
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.quad CRASHPAD_INFO_SYMBOL - desc
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#else
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.long CRASHPAD_INFO_SYMBOL - desc
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#endif // __LP64__
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desc_end:
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.size CRASHPAD_NOTE, .-CRASHPAD_NOTE
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// CRASHPAD_NOTE can't be referenced directly by GetCrashpadInfo() because the
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// relocation used to make the reference may require that the address be
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// 8-byte aligned and notes must have 4-byte alignment.
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.section .rodata,"a",%progbits
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.balign 8
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# .globl indicates that it's available to link against other .o files. .hidden
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# indicates that it will not appear in the executable's symbol table.
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.globl CRASHPAD_NOTE_REFERENCE
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.hidden CRASHPAD_NOTE_REFERENCE
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.type CRASHPAD_NOTE_REFERENCE, %object
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CRASHPAD_NOTE_REFERENCE:
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// The value of this quad isn't important. It exists to reference
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// CRASHPAD_NOTE, causing the linker to include the note into the binary
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// linking Crashpad. The subtraction from |name| is a convenience to allow the
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// value to be computed statically.
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.quad name - CRASHPAD_NOTE
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