94 lines
3.1 KiB
C++
Executable File
94 lines
3.1 KiB
C++
Executable File
/**********
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* Copyright (c) 2004 Greg Parker. 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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY GREG PARKER ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**********/
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#ifndef GOT_H
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#define GOT_H
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#include <stdint.h>
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#include <vector>
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using namespace std;
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#include "swap.h"
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#include "section.h"
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#include "relocation.h"
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#include "symbol.h"
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#include "complain.h"
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class GOT : public Section {
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vector<uint32_t> mEntries;
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vector<const Symbol *> mSymbols;
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public:
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GOT(Image& newImage)
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: Section(newImage)
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{ }
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void read(Elf32_Shdr *shdr)
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{
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Section::read(shdr);
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uint32_t *entryArray = (uint32_t *)mContents;
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mEntries.resize(mSize / 4);
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mSymbols.resize(mSize / 4);
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for (unsigned int i = 0; i < mSize / 4; i++) {
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mEntries[i] = swap32(entryArray[i]);
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mSymbols[i] = NULL;
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}
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}
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const vector<uint32_t>& entries(void) const { return mEntries; }
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vector<const Symbol *>& symbols(void) { return mSymbols; }
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void buildRelocations(void)
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{
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// GOT entries may refer to local symbols, which will be stripped.
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// Instead, use section symbol + offset in section.
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mContents = (uint8_t *)calloc(mEntries.size(), 4);
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mSize = mEntries.size() * 4;
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for (unsigned int g = 0; g < mSymbols.size(); g++) {
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if (mSymbols[g]) {
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if (!mSymbols[g]->section()) {
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unimplemented("GOT entry is an absolute or other section-less symbol");
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}
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Symbol *sectionSymbol = mSymbols[g]->section()->baseSymbol();
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mRelocations.push_back
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(Relocation(R_ARM_ABS32, g*4, sectionSymbol,
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mSymbols[g]->offset(thumb)));
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}
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}
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}
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void emit(Elf32_Shdr *shdr, uint8_t *&buf, uint32_t& bufLen)
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{
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// Emitted GOT is all zero. Use NOBITS rather than PROGBITS.
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mType = SHT_NOBITS;
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Section::emit(shdr, buf, bufLen);
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}
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};
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#endif
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