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-rw-r--r--ELF/LinkerScript.cpp50
1 files changed, 50 insertions, 0 deletions
diff --git a/ELF/LinkerScript.cpp b/ELF/LinkerScript.cpp
index ab2ca22e9e17..63eb90456e17 100644
--- a/ELF/LinkerScript.cpp
+++ b/ELF/LinkerScript.cpp
@@ -413,6 +413,56 @@ void LinkerScript::processCommands(OutputSectionFactory &Factory) {
CurOutSec = nullptr;
}
+void LinkerScript::fabricateDefaultCommands(bool AllocateHeader) {
+ std::vector<BaseCommand *> Commands;
+
+ // Define start address
+ uint64_t StartAddr = Config->ImageBase;
+ if (AllocateHeader)
+ StartAddr += elf::getHeaderSize();
+
+ // The Sections with -T<section> are sorted in order of ascending address
+ // we must use this if it is lower than StartAddr as calls to setDot() must
+ // be monotonically increasing
+ if (!Config->SectionStartMap.empty()) {
+ uint64_t LowestSecStart = Config->SectionStartMap.begin()->second;
+ StartAddr = std::min(StartAddr, LowestSecStart);
+ }
+ Commands.push_back(
+ make<SymbolAssignment>(".", [=] { return StartAddr; }, ""));
+
+ // For each OutputSection that needs a VA fabricate an OutputSectionCommand
+ // with an InputSectionDescription describing the InputSections
+ for (OutputSection *Sec : *OutputSections) {
+ if (!(Sec->Flags & SHF_ALLOC))
+ continue;
+
+ auto I = Config->SectionStartMap.find(Sec->Name);
+ if (I != Config->SectionStartMap.end())
+ Commands.push_back(
+ make<SymbolAssignment>(".", [=] { return I->second; }, ""));
+
+ auto *OSCmd = make<OutputSectionCommand>(Sec->Name);
+ OSCmd->Sec = Sec;
+ if (Sec->PageAlign)
+ OSCmd->AddrExpr = [=] {
+ return alignTo(Script->getDot(), Config->MaxPageSize);
+ };
+ Commands.push_back(OSCmd);
+ if (Sec->Sections.size()) {
+ auto *ISD = make<InputSectionDescription>("");
+ OSCmd->Commands.push_back(ISD);
+ for (InputSection *ISec : Sec->Sections) {
+ ISD->Sections.push_back(ISec);
+ ISec->Assigned = true;
+ }
+ }
+ }
+ // SECTIONS commands run before other non SECTIONS commands
+ Commands.insert(Commands.end(), Opt.Commands.begin(), Opt.Commands.end());
+ Opt.Commands = std::move(Commands);
+}
+
// Add sections that didn't match any sections command.
void LinkerScript::addOrphanSections(OutputSectionFactory &Factory) {
for (InputSectionBase *S : InputSections)