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110 lines
3.8 KiB
110 lines
3.8 KiB
4 months ago
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/*
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* Copyright (C) 2015 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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#include <string.h>
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#include "linker.h"
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#include "linker_sleb128.h"
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const size_t RELOCATION_GROUPED_BY_INFO_FLAG = 1;
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const size_t RELOCATION_GROUPED_BY_OFFSET_DELTA_FLAG = 2;
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const size_t RELOCATION_GROUPED_BY_ADDEND_FLAG = 4;
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const size_t RELOCATION_GROUP_HAS_ADDEND_FLAG = 8;
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#if defined(USE_RELA)
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typedef ElfW(Rela) rel_t;
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#else
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typedef ElfW(Rel) rel_t;
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#endif
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template <typename F>
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inline bool for_all_packed_relocs(sleb128_decoder decoder, F&& callback) {
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const size_t num_relocs = decoder.pop_front();
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rel_t reloc = {
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.r_offset = decoder.pop_front(),
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};
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for (size_t idx = 0; idx < num_relocs; ) {
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const size_t group_size = decoder.pop_front();
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const size_t group_flags = decoder.pop_front();
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size_t group_r_offset_delta = 0;
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if (group_flags & RELOCATION_GROUPED_BY_OFFSET_DELTA_FLAG) {
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group_r_offset_delta = decoder.pop_front();
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}
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if (group_flags & RELOCATION_GROUPED_BY_INFO_FLAG) {
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reloc.r_info = decoder.pop_front();
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}
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#if defined(USE_RELA)
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const size_t group_flags_reloc = group_flags & (RELOCATION_GROUP_HAS_ADDEND_FLAG |
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RELOCATION_GROUPED_BY_ADDEND_FLAG);
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if (group_flags_reloc == RELOCATION_GROUP_HAS_ADDEND_FLAG) {
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// Each relocation has an addend. This is the default situation with lld's current encoder.
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} else if (group_flags_reloc == (RELOCATION_GROUP_HAS_ADDEND_FLAG |
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RELOCATION_GROUPED_BY_ADDEND_FLAG)) {
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reloc.r_addend += decoder.pop_front();
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} else {
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reloc.r_addend = 0;
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}
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#else
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if (__predict_false(group_flags & RELOCATION_GROUP_HAS_ADDEND_FLAG)) {
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// This platform does not support rela, and yet we have it encoded in android_rel section.
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async_safe_fatal("unexpected r_addend in android.rel section");
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}
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#endif
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for (size_t i = 0; i < group_size; ++i) {
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if (group_flags & RELOCATION_GROUPED_BY_OFFSET_DELTA_FLAG) {
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reloc.r_offset += group_r_offset_delta;
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} else {
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reloc.r_offset += decoder.pop_front();
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}
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if ((group_flags & RELOCATION_GROUPED_BY_INFO_FLAG) == 0) {
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reloc.r_info = decoder.pop_front();
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}
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#if defined(USE_RELA)
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if (group_flags_reloc == RELOCATION_GROUP_HAS_ADDEND_FLAG) {
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reloc.r_addend += decoder.pop_front();
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}
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#endif
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if (!callback(reloc)) {
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return false;
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}
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}
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idx += group_size;
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}
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return true;
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}
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