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//===--- ELF_loongarch.cpp - JIT linker implementation for ELF/loongarch --===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// ELF/loongarch jit-link implementation.
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/JITLink/ELF_loongarch.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/ExecutionEngine/JITLink/DWARFRecordSectionSplitter.h"
#include "llvm/ExecutionEngine/JITLink/JITLink.h"
#include "llvm/ExecutionEngine/JITLink/loongarch.h"
#include "llvm/Object/ELF.h"
#include "llvm/Object/ELFObjectFile.h"
#include "EHFrameSupportImpl.h"
#include "ELFLinkGraphBuilder.h"
#include "JITLinkGeneric.h"
#define DEBUG_TYPE "jitlink"
using namespace llvm;
using namespace llvm::jitlink;
using namespace llvm::jitlink::loongarch;
namespace {
class ELFJITLinker_loongarch : public JITLinker<ELFJITLinker_loongarch> {
friend class JITLinker<ELFJITLinker_loongarch>;
public:
ELFJITLinker_loongarch(std::unique_ptr<JITLinkContext> Ctx,
std::unique_ptr<LinkGraph> G,
PassConfiguration PassConfig)
: JITLinker(std::move(Ctx), std::move(G), std::move(PassConfig)) {}
private:
Error applyFixup(LinkGraph &G, Block &B, const Edge &E) const {
return loongarch::applyFixup(G, B, E);
}
};
template <typename ELFT>
class ELFLinkGraphBuilder_loongarch : public ELFLinkGraphBuilder<ELFT> {
private:
static Expected<loongarch::EdgeKind_loongarch>
getRelocationKind(const uint32_t Type) {
using namespace loongarch;
switch (Type) {
case ELF::R_LARCH_64:
return Pointer64;
case ELF::R_LARCH_32:
return Pointer32;
case ELF::R_LARCH_32_PCREL:
return Delta32;
case ELF::R_LARCH_B26:
return Branch26PCRel;
case ELF::R_LARCH_PCALA_HI20:
return Page20;
case ELF::R_LARCH_PCALA_LO12:
return PageOffset12;
case ELF::R_LARCH_GOT_PC_HI20:
return RequestGOTAndTransformToPage20;
case ELF::R_LARCH_GOT_PC_LO12:
return RequestGOTAndTransformToPageOffset12;
}
return make_error<JITLinkError>(
"Unsupported loongarch relocation:" + formatv("{0:d}: ", Type) +
object::getELFRelocationTypeName(ELF::EM_LOONGARCH, Type));
}
Error addRelocations() override {
LLVM_DEBUG(dbgs() << "Processing relocations:\n");
using Base = ELFLinkGraphBuilder<ELFT>;
using Self = ELFLinkGraphBuilder_loongarch<ELFT>;
for (const auto &RelSect : Base::Sections)
if (Error Err = Base::forEachRelaRelocation(RelSect, this,
&Self::addSingleRelocation))
return Err;
return Error::success();
}
Error addSingleRelocation(const typename ELFT::Rela &Rel,
const typename ELFT::Shdr &FixupSect,
Block &BlockToFix) {
using Base = ELFLinkGraphBuilder<ELFT>;
uint32_t SymbolIndex = Rel.getSymbol(false);
auto ObjSymbol = Base::Obj.getRelocationSymbol(Rel, Base::SymTabSec);
if (!ObjSymbol)
return ObjSymbol.takeError();
Symbol *GraphSymbol = Base::getGraphSymbol(SymbolIndex);
if (!GraphSymbol)
return make_error<StringError>(
formatv("Could not find symbol at given index, did you add it to "
"JITSymbolTable? index: {0}, shndx: {1} Size of table: {2}",
SymbolIndex, (*ObjSymbol)->st_shndx,
Base::GraphSymbols.size()),
inconvertibleErrorCode());
uint32_t Type = Rel.getType(false);
Expected<loongarch::EdgeKind_loongarch> Kind = getRelocationKind(Type);
if (!Kind)
return Kind.takeError();
int64_t Addend = Rel.r_addend;
auto FixupAddress = orc::ExecutorAddr(FixupSect.sh_addr) + Rel.r_offset;
Edge::OffsetT Offset = FixupAddress - BlockToFix.getAddress();
Edge GE(*Kind, Offset, *GraphSymbol, Addend);
LLVM_DEBUG({
dbgs() << " ";
printEdge(dbgs(), BlockToFix, GE, loongarch::getEdgeKindName(*Kind));
dbgs() << "\n";
});
BlockToFix.addEdge(std::move(GE));
return Error::success();
}
public:
ELFLinkGraphBuilder_loongarch(StringRef FileName,
const object::ELFFile<ELFT> &Obj,
const Triple T)
: ELFLinkGraphBuilder<ELFT>(Obj, std::move(T), FileName,
loongarch::getEdgeKindName) {}
};
Error buildTables_ELF_loongarch(LinkGraph &G) {
LLVM_DEBUG(dbgs() << "Visiting edges in graph:\n");
GOTTableManager GOT;
PLTTableManager PLT(GOT);
visitExistingEdges(G, GOT, PLT);
return Error::success();
}
} // namespace
namespace llvm {
namespace jitlink {
Expected<std::unique_ptr<LinkGraph>>
createLinkGraphFromELFObject_loongarch(MemoryBufferRef ObjectBuffer) {
LLVM_DEBUG({
dbgs() << "Building jitlink graph for new input "
<< ObjectBuffer.getBufferIdentifier() << "...\n";
});
auto ELFObj = object::ObjectFile::createELFObjectFile(ObjectBuffer);
if (!ELFObj)
return ELFObj.takeError();
if ((*ELFObj)->getArch() == Triple::loongarch64) {
auto &ELFObjFile = cast<object::ELFObjectFile<object::ELF64LE>>(**ELFObj);
return ELFLinkGraphBuilder_loongarch<object::ELF64LE>(
(*ELFObj)->getFileName(), ELFObjFile.getELFFile(),
(*ELFObj)->makeTriple())
.buildGraph();
}
assert((*ELFObj)->getArch() == Triple::loongarch32 &&
"Invalid triple for LoongArch ELF object file");
auto &ELFObjFile = cast<object::ELFObjectFile<object::ELF32LE>>(**ELFObj);
return ELFLinkGraphBuilder_loongarch<object::ELF32LE>(
(*ELFObj)->getFileName(), ELFObjFile.getELFFile(),
(*ELFObj)->makeTriple())
.buildGraph();
}
void link_ELF_loongarch(std::unique_ptr<LinkGraph> G,
std::unique_ptr<JITLinkContext> Ctx) {
PassConfiguration Config;
const Triple &TT = G->getTargetTriple();
if (Ctx->shouldAddDefaultTargetPasses(TT)) {
// Add eh-frame passses.
Config.PrePrunePasses.push_back(DWARFRecordSectionSplitter(".eh_frame"));
Config.PrePrunePasses.push_back(
EHFrameEdgeFixer(".eh_frame", G->getPointerSize(), Pointer32, Pointer64,
Delta32, Delta64, NegDelta32));
Config.PrePrunePasses.push_back(EHFrameNullTerminator(".eh_frame"));
// Add a mark-live pass.
if (auto MarkLive = Ctx->getMarkLivePass(TT))
Config.PrePrunePasses.push_back(std::move(MarkLive));
else
Config.PrePrunePasses.push_back(markAllSymbolsLive);
// Add an in-place GOT/PLTStubs build pass.
Config.PostPrunePasses.push_back(buildTables_ELF_loongarch);
}
if (auto Err = Ctx->modifyPassConfig(*G, Config))
return Ctx->notifyFailed(std::move(Err));
ELFJITLinker_loongarch::link(std::move(Ctx), std::move(G), std::move(Config));
}
} // namespace jitlink
} // namespace llvm
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