2 * Copyright (c) 2004 Greg Parker. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY GREG PARKER ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include "relocation.h"
39 class GOT : public Section {
40 vector<uint32_t> mEntries;
41 vector<const Symbol *> mSymbols;
48 void read(Elf32_Shdr *shdr)
52 uint32_t *entryArray = (uint32_t *)mContents;
53 mEntries.resize(mSize / 4);
54 mSymbols.resize(mSize / 4);
55 for (unsigned int i = 0; i < mSize / 4; i++) {
56 mEntries[i] = swap32(entryArray[i]);
61 const vector<uint32_t>& entries(void) const { return mEntries; }
62 vector<const Symbol *>& symbols(void) { return mSymbols; }
64 void buildRelocations(void)
66 // GOT entries may refer to local symbols, which will be stripped.
67 // Instead, use section symbol + offset in section.
69 mContents = (uint8_t *)calloc(mEntries.size(), 4);
70 mSize = mEntries.size() * 4;
72 for (unsigned int g = 0; g < mSymbols.size(); g++) {
74 if (!mSymbols[g]->section()) {
75 unimplemented("GOT entry is an absolute or other section-less symbol");
77 Symbol *sectionSymbol = mSymbols[g]->section()->baseSymbol();
78 mRelocations.push_back
79 (Relocation(R_ARM_ABS32, g*4, sectionSymbol,
80 mSymbols[g]->offset(thumb)));
85 void emit(Elf32_Shdr *shdr, uint8_t *&buf, uint32_t& bufLen)
87 // Emitted GOT is all zero. Use NOBITS rather than PROGBITS.
89 Section::emit(shdr, buf, bufLen);