1 files changed, 75 insertions, 0 deletions
diff --git a/lib/ReaderWriter/PECOFF/LoadConfigPass.cpp b/lib/ReaderWriter/PECOFF/LoadConfigPass.cpp
new file mode 100644
index 0000000000000..be2f5627f4ea7
--- /dev/null
+++ b/lib/ReaderWriter/PECOFF/LoadConfigPass.cpp
@@ -0,0 +1,75 @@
+//===- lib/ReaderWriter/PECOFF/LoadConfigPass.cpp -------------------------===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// A Load Configuration is a data structure for x86 containing an address of the
+// SEH handler table. The Data Directory in the file header points to a load
+// configuration. Technically that indirection is not needed but exists for
+// historical reasons.
+//
+// If the file being handled has .sxdata section containing SEH handler table,
+// this pass will create a Load Configuration atom.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Pass.h"
+#include "LoadConfigPass.h"
+#include "lld/Core/File.h"
+#include "lld/Core/Pass.h"
+#include "lld/Core/Simple.h"
+#include "llvm/Object/COFF.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Path.h"
+#include <climits>
+#include <ctime>
+#include <utility>
+
+using llvm::object::coff_load_configuration32;
+
+namespace lld {
+namespace pecoff {
+namespace loadcfg {
+
+LoadConfigAtom::LoadConfigAtom(VirtualFile &file, const DefinedAtom *sxdata,
+                               int count)
+    : COFFLinkerInternalAtom(
+          file, file.getNextOrdinal(),
+          std::vector<uint8_t>(sizeof(coff_load_configuration32))) {
+  addDir32Reloc(
+      this, sxdata, llvm::COFF::IMAGE_FILE_MACHINE_I386,
+      offsetof(llvm::object::coff_load_configuration32, SEHandlerTable));
+  auto *data = getContents<llvm::object::coff_load_configuration32>();
+  data->SEHandlerCount = count;
+}
+
+} // namespace loadcfg
+
+void LoadConfigPass::perform(std::unique_ptr<MutableFile> &file) {
+  if (_ctx.noSEH())
+    return;
+
+  // Find the first atom in .sxdata section.
+  const DefinedAtom *sxdata = nullptr;
+  int sectionSize = 0;
+  for (const DefinedAtom *atom : file->defined()) {
+    if (atom->customSectionName() == ".sxdata") {
+      if (!sxdata)
+        sxdata = atom;
+      sectionSize += sxdata->size();
+    }
+  }
+  if (!sxdata)
+    return;
+
+  auto *loadcfg = new (_alloc)
+      loadcfg::LoadConfigAtom(_file, sxdata, sectionSize / sizeof(uint32_t));
+  file->addAtom(*loadcfg);
+}
+
+} // namespace pecoff
+} // namespace lld