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/*
* Copyright 2011, The Android Open Source Project
*
* 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 ELF_SECTION_REL_TABLE_HXX
#define ELF_SECTION_REL_TABLE_HXX
#include "ELF.h"
#include "ELFHeader.h"
#include "ELFObject.h"
#include "ELFReloc.h"
#include "ELFTypes.h"
#include <set>
template <unsigned Bitwidth>
ELFSectionRelTable<Bitwidth>::~ELFSectionRelTable() {
using namespace std;
for (size_t i = 0; i < table.size(); ++i) {
delete table[i];
}
}
template <unsigned Bitwidth>
void ELFSectionRelTable<Bitwidth>::print() const {
using namespace llvm;
out() << '\n' << fillformat('=', 79) << '\n';
out().changeColor(raw_ostream::WHITE, true);
out() << "Relocation Table" << '\n';
out().resetColor();
for (size_t i = 0; i < this->size(); ++i) {
(*this)[i]->print();
}
out() << fillformat('=', 79) << '\n';
}
template <unsigned Bitwidth>
template <typename Archiver>
ELFSectionRelTable<Bitwidth> *
ELFSectionRelTable<Bitwidth>::read(Archiver &AR,
ELFSectionHeaderTy const *sh) {
rsl_assert(sh->getType() == SHT_REL || sh->getType() == SHT_RELA);
llvm::OwningPtr<ELFSectionRelTable> rt(new ELFSectionRelTable());
// Seek to the start of the table
AR.seek(sh->getOffset(), true);
// Count the relocation entries
size_t size = sh->getSize() / sh->getEntrySize();
// Read every relocation entries
if (sh->getType() == SHT_REL) {
rsl_assert(sh->getEntrySize() == TypeTraits<ELFRelocRelTy>::size);
for (size_t i = 0; i < size; ++i) {
rt->table.push_back(ELFRelocTy::readRel(AR, i));
}
} else {
rsl_assert(sh->getEntrySize() == TypeTraits<ELFRelocRelaTy>::size);
for (size_t i = 0; i < size; ++i) {
rt->table.push_back(ELFRelocTy::readRela(AR, i));
}
}
if (!AR) {
// Unable to read the table.
return 0;
}
return rt.take();
}
template <unsigned Bitwidth>
size_t ELFSectionRelTable<Bitwidth>::
getMaxNumStubs(ELFObjectTy const *obj) const {
switch (obj->getHeader()->getMachine()) {
case EM_ARM:
{
std::set<uint32_t> sym_index_set;
for (size_t i = 0; i < size(); ++i) {
ELFRelocTy *rel = table[i];
switch (rel->getType()) {
case R_ARM_CALL:
case R_ARM_THM_CALL:
case R_ARM_JUMP24:
case R_ARM_THM_JUMP24:
sym_index_set.insert(rel->getSymTabIndex());
break;
}
}
return sym_index_set.size();
}
case EM_MIPS:
{
std::set<uint32_t> sym_index_set;
for (size_t i = 0; i < size(); ++i) {
ELFRelocTy *rel = table[i];
if (rel->getType() == R_MIPS_26) {
sym_index_set.insert(rel->getSymTabIndex());
}
}
return sym_index_set.size();
}
case EM_386:
case EM_X86_64:
return 0;
default:
rsl_assert(0 && "Only support ARM, MIPS, X86, and X86_64 relocation.");
return 0;
}
}
#endif // ELF_SECTION_REL_TABLE_HXX
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