76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
//===- lib/ReaderWriter/PECOFF/LoadConfigPass.cpp -------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// A Load Configuration is a data structure for x86 containing an address of the
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// SEH handler table. The Data Directory in the file header points to a load
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// configuration. Technically that indirection is not needed but exists for
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// historical reasons.
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//
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// If the file being handled has .sxdata section containing SEH handler table,
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// this pass will create a Load Configuration atom.
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//
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//===----------------------------------------------------------------------===//
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#include "Pass.h"
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#include "LoadConfigPass.h"
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#include "lld/Core/File.h"
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#include "lld/Core/Pass.h"
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#include "lld/Core/Simple.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Path.h"
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#include <climits>
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#include <ctime>
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#include <utility>
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using llvm::object::coff_load_configuration32;
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namespace lld {
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namespace pecoff {
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namespace loadcfg {
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LoadConfigAtom::LoadConfigAtom(VirtualFile &file, const DefinedAtom *sxdata,
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int count)
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: COFFLinkerInternalAtom(
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file, file.getNextOrdinal(),
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std::vector<uint8_t>(sizeof(coff_load_configuration32))) {
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addDir32Reloc(
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this, sxdata, llvm::COFF::IMAGE_FILE_MACHINE_I386,
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offsetof(llvm::object::coff_load_configuration32, SEHandlerTable));
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auto *data = getContents<llvm::object::coff_load_configuration32>();
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data->SEHandlerCount = count;
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}
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} // namespace loadcfg
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void LoadConfigPass::perform(std::unique_ptr<SimpleFile> &file) {
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if (_ctx.noSEH())
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return;
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// Find the first atom in .sxdata section.
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const DefinedAtom *sxdata = nullptr;
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int sectionSize = 0;
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for (const DefinedAtom *atom : file->defined()) {
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if (atom->customSectionName() == ".sxdata") {
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if (!sxdata)
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sxdata = atom;
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sectionSize += sxdata->size();
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}
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}
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if (!sxdata)
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return;
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auto *loadcfg = new (_alloc)
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loadcfg::LoadConfigAtom(_file, sxdata, sectionSize / sizeof(uint32_t));
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file->addAtom(*loadcfg);
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}
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} // namespace pecoff
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} // namespace lld
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