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[PowerPC] 32-bit ELF PIC support

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This adds initial support for PPC32 ELF PIC (Position Independent Code; the
-fPIC variety), thus rectifying a long-standing deficiency in the PowerPC
backend.

Patch by Justin Hibbits!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213427 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2014-07-18 23:29:49 +00:00
parent 286fbd19f3
commit d644d17dd4
20 changed files with 396 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/PowerPC/PPCFrameLowering.cpp
+13 -6
View File
@@ -461,7 +461,7 @@ void PPCFrameLowering::replaceFPWithRealFP(MachineFunction &MF) const {
const PPCRegisterInfo *RegInfo =
static_cast<const PPCRegisterInfo*>(MF.getTarget().getRegisterInfo());
bool HasBP = RegInfo->hasBasePointer(MF);
unsigned BPReg = HasBP ? (unsigned) PPC::R30 : FPReg;
unsigned BPReg = HasBP ? (unsigned) RegInfo->getBaseRegister(MF) : FPReg;
unsigned BP8Reg = HasBP ? (unsigned) PPC::X30 : FPReg;
for (MachineFunction::iterator BI = MF.begin(), BE = MF.end();
@@ -506,6 +506,7 @@ void PPCFrameLowering::emitPrologue(MachineFunction &MF) const {
DebugLoc dl;
bool needsFrameMoves = MMI.hasDebugInfo() ||
MF.getFunction()->needsUnwindTableEntry();
bool isPIC = MF.getTarget().getRelocationModel() == Reloc::PIC_;
// Get processor type.
bool isPPC64 = Subtarget.isPPC64();
@@ -546,7 +547,7 @@ void PPCFrameLowering::emitPrologue(MachineFunction &MF) const {
bool HasBP = RegInfo->hasBasePointer(MF);
unsigned SPReg = isPPC64 ? PPC::X1 : PPC::R1;
unsigned BPReg = isPPC64 ? PPC::X30 : PPC::R30;
unsigned BPReg = RegInfo->getBaseRegister(MF);
unsigned FPReg = isPPC64 ? PPC::X31 : PPC::R31;
unsigned LRReg = isPPC64 ? PPC::LR8 : PPC::LR;
unsigned ScratchReg = isPPC64 ? PPC::X0 : PPC::R0;
@@ -602,7 +603,9 @@ void PPCFrameLowering::emitPrologue(MachineFunction &MF) const {
BPOffset = FFI->getObjectOffset(BPIndex);
} else {
BPOffset =
PPCFrameLowering::getBasePointerSaveOffset(isPPC64, isDarwinABI);
PPCFrameLowering::getBasePointerSaveOffset(isPPC64,
isDarwinABI,
isPIC);
}
}
@@ -839,6 +842,7 @@ void PPCFrameLowering::emitEpilogue(MachineFunction &MF,
// Get the ABI.
bool isDarwinABI = Subtarget.isDarwinABI();
bool isSVR4ABI = Subtarget.isSVR4ABI();
bool isPIC = MF.getTarget().getRelocationModel() == Reloc::PIC_;
// Check if the link register (LR) has been saved.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
@@ -849,7 +853,7 @@ void PPCFrameLowering::emitEpilogue(MachineFunction &MF,
bool HasBP = RegInfo->hasBasePointer(MF);
unsigned SPReg = isPPC64 ? PPC::X1 : PPC::R1;
unsigned BPReg = isPPC64 ? PPC::X30 : PPC::R30;
unsigned BPReg = RegInfo->getBaseRegister(MF);
unsigned FPReg = isPPC64 ? PPC::X31 : PPC::R31;
unsigned ScratchReg = isPPC64 ? PPC::X0 : PPC::R0;
unsigned TempReg = isPPC64 ? PPC::X12 : PPC::R12; // another scratch reg
@@ -890,7 +894,9 @@ void PPCFrameLowering::emitEpilogue(MachineFunction &MF,
BPOffset = FFI->getObjectOffset(BPIndex);
} else {
BPOffset =
PPCFrameLowering::getBasePointerSaveOffset(isPPC64, isDarwinABI);
PPCFrameLowering::getBasePointerSaveOffset(isPPC64,
isDarwinABI,
isPIC);
}
}
@@ -1067,6 +1073,7 @@ PPCFrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
int FPSI = FI->getFramePointerSaveIndex();
bool isPPC64 = Subtarget.isPPC64();
bool isDarwinABI = Subtarget.isDarwinABI();
bool isPIC = MF.getTarget().getRelocationModel() == Reloc::PIC_;
MachineFrameInfo *MFI = MF.getFrameInfo();
// If the frame pointer save index hasn't been defined yet.
@@ -1081,7 +1088,7 @@ PPCFrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
int BPSI = FI->getBasePointerSaveIndex();
if (!BPSI && RegInfo->hasBasePointer(MF)) {
int BPOffset = getBasePointerSaveOffset(isPPC64, isDarwinABI);
int BPOffset = getBasePointerSaveOffset(isPPC64, isDarwinABI, isPIC);
// Allocate the frame index for the base pointer save area.
BPSI = MFI->CreateFixedObject(isPPC64? 8 : 4, BPOffset, true);
// Save the result.