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-rw-r--r--lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp95
1 files changed, 67 insertions, 28 deletions
diff --git a/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp b/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
index 0d42081..c54d5e7 100644
--- a/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
+++ b/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
@@ -9,7 +9,9 @@
#include "MCTargetDesc/PPCMCTargetDesc.h"
#include "MCTargetDesc/PPCFixupKinds.h"
+#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCELF.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCMachObjectWriter.h"
@@ -71,14 +73,18 @@ static unsigned getFixupKindNumBytes(unsigned Kind) {
namespace {
class PPCAsmBackend : public MCAsmBackend {
-const Target &TheTarget;
+ const Target &TheTarget;
+ bool IsLittleEndian;
public:
- PPCAsmBackend(const Target &T) : MCAsmBackend(), TheTarget(T) {}
+ PPCAsmBackend(const Target &T, bool isLittle) : MCAsmBackend(), TheTarget(T),
+ IsLittleEndian(isLittle) {}
- unsigned getNumFixupKinds() const { return PPC::NumTargetFixupKinds; }
+ unsigned getNumFixupKinds() const override {
+ return PPC::NumTargetFixupKinds;
+ }
- const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
- const static MCFixupKindInfo Infos[PPC::NumTargetFixupKinds] = {
+ const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override {
+ const static MCFixupKindInfo InfosBE[PPC::NumTargetFixupKinds] = {
// name offset bits flags
{ "fixup_ppc_br24", 6, 24, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_ppc_brcond14", 16, 14, MCFixupKindInfo::FKF_IsPCRel },
@@ -88,17 +94,27 @@ public:
{ "fixup_ppc_half16ds", 0, 14, 0 },
{ "fixup_ppc_nofixup", 0, 0, 0 }
};
+ const static MCFixupKindInfo InfosLE[PPC::NumTargetFixupKinds] = {
+ // name offset bits flags
+ { "fixup_ppc_br24", 2, 24, MCFixupKindInfo::FKF_IsPCRel },
+ { "fixup_ppc_brcond14", 2, 14, MCFixupKindInfo::FKF_IsPCRel },
+ { "fixup_ppc_br24abs", 2, 24, 0 },
+ { "fixup_ppc_brcond14abs", 2, 14, 0 },
+ { "fixup_ppc_half16", 0, 16, 0 },
+ { "fixup_ppc_half16ds", 2, 14, 0 },
+ { "fixup_ppc_nofixup", 0, 0, 0 }
+ };
if (Kind < FirstTargetFixupKind)
return MCAsmBackend::getFixupKindInfo(Kind);
assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
"Invalid kind!");
- return Infos[Kind - FirstTargetFixupKind];
+ return (IsLittleEndian? InfosLE : InfosBE)[Kind - FirstTargetFixupKind];
}
void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
- uint64_t Value) const {
+ uint64_t Value, bool IsPCRel) const override {
Value = adjustFixupValue(Fixup.getKind(), Value);
if (!Value) return; // Doesn't change encoding.
@@ -108,11 +124,37 @@ public:
// For each byte of the fragment that the fixup touches, mask in the bits
// from the fixup value. The Value has been "split up" into the appropriate
// bitfields above.
- for (unsigned i = 0; i != NumBytes; ++i)
- Data[Offset + i] |= uint8_t((Value >> ((NumBytes - i - 1)*8)) & 0xff);
+ for (unsigned i = 0; i != NumBytes; ++i) {
+ unsigned Idx = IsLittleEndian ? i : (NumBytes - 1 - i);
+ Data[Offset + i] |= uint8_t((Value >> (Idx * 8)) & 0xff);
+ }
+ }
+
+ void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout,
+ const MCFixup &Fixup, const MCFragment *DF,
+ const MCValue &Target, uint64_t &Value,
+ bool &IsResolved) override {
+ switch ((PPC::Fixups)Fixup.getKind()) {
+ default: break;
+ case PPC::fixup_ppc_br24:
+ case PPC::fixup_ppc_br24abs:
+ // If the target symbol has a local entry point we must not attempt
+ // to resolve the fixup directly. Emit a relocation and leave
+ // resolution of the final target address to the linker.
+ if (const MCSymbolRefExpr *A = Target.getSymA()) {
+ const MCSymbolData &Data = Asm.getSymbolData(A->getSymbol());
+ // The "other" values are stored in the last 6 bits of the second byte.
+ // The traditional defines for STO values assume the full byte and thus
+ // the shift to pack it.
+ unsigned Other = MCELF::getOther(Data) << 2;
+ if ((Other & ELF::STO_PPC64_LOCAL_MASK) != 0)
+ IsResolved = false;
+ }
+ break;
+ }
}
- bool mayNeedRelaxation(const MCInst &Inst) const {
+ bool mayNeedRelaxation(const MCInst &Inst) const override {
// FIXME.
return false;
}
@@ -120,18 +162,18 @@ public:
bool fixupNeedsRelaxation(const MCFixup &Fixup,
uint64_t Value,
const MCRelaxableFragment *DF,
- const MCAsmLayout &Layout) const {
+ const MCAsmLayout &Layout) const override {
// FIXME.
llvm_unreachable("relaxInstruction() unimplemented");
}
- void relaxInstruction(const MCInst &Inst, MCInst &Res) const {
+ void relaxInstruction(const MCInst &Inst, MCInst &Res) const override {
// FIXME.
llvm_unreachable("relaxInstruction() unimplemented");
}
- bool writeNopData(uint64_t Count, MCObjectWriter *OW) const {
+ bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override {
uint64_t NumNops = Count / 4;
for (uint64_t i = 0; i != NumNops; ++i)
OW->Write32(0x60000000);
@@ -152,6 +194,10 @@ public:
assert(Name == "ppc32" && "Unknown target name!");
return 4;
}
+
+ bool isLittleEndian() const {
+ return IsLittleEndian;
+ }
};
} // end anonymous namespace
@@ -160,9 +206,9 @@ public:
namespace {
class DarwinPPCAsmBackend : public PPCAsmBackend {
public:
- DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T) { }
+ DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T, false) { }
- MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
+ MCObjectWriter *createObjectWriter(raw_ostream &OS) const override {
bool is64 = getPointerSize() == 8;
return createPPCMachObjectWriter(
OS,
@@ -170,26 +216,18 @@ namespace {
(is64 ? MachO::CPU_TYPE_POWERPC64 : MachO::CPU_TYPE_POWERPC),
MachO::CPU_SUBTYPE_POWERPC_ALL);
}
-
- virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
- return false;
- }
};
class ELFPPCAsmBackend : public PPCAsmBackend {
uint8_t OSABI;
public:
- ELFPPCAsmBackend(const Target &T, uint8_t OSABI) :
- PPCAsmBackend(T), OSABI(OSABI) { }
+ ELFPPCAsmBackend(const Target &T, bool IsLittleEndian, uint8_t OSABI) :
+ PPCAsmBackend(T, IsLittleEndian), OSABI(OSABI) { }
- MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
+ MCObjectWriter *createObjectWriter(raw_ostream &OS) const override {
bool is64 = getPointerSize() == 8;
- return createPPCELFObjectWriter(OS, is64, OSABI);
- }
-
- virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
- return false;
+ return createPPCELFObjectWriter(OS, is64, isLittleEndian(), OSABI);
}
};
@@ -202,5 +240,6 @@ MCAsmBackend *llvm::createPPCAsmBackend(const Target &T,
return new DarwinPPCAsmBackend(T);
uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS());
- return new ELFPPCAsmBackend(T, OSABI);
+ bool IsLittleEndian = Triple(TT).getArch() == Triple::ppc64le;
+ return new ELFPPCAsmBackend(T, IsLittleEndian, OSABI);
}
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