llvm-6502/lib/MC
Bill Schmidt d7802bf0dd This patch introduces initial-exec model support for thread-local storage
on 64-bit PowerPC ELF.

The patch includes code to handle external assembly and MC output with the
integrated assembler.  It intentionally does not support the "old" JIT.

For the initial-exec TLS model, the ABI requires the following to calculate
the address of external thread-local variable x:

 Code sequence            Relocation                  Symbol
  ld 9,x@got@tprel(2)      R_PPC64_GOT_TPREL16_DS      x
  add 9,9,x@tls            R_PPC64_TLS                 x

The register 9 is arbitrary here.  The linker will replace x@got@tprel
with the offset relative to the thread pointer to the generated GOT
entry for symbol x.  It will replace x@tls with the thread-pointer
register (13).

The two test cases verify correct assembly output and relocation output
as just described.

PowerPC-specific selection node variants are added for the two
instructions above:  LD_GOT_TPREL and ADD_TLS.  These are inserted
when an initial-exec global variable is encountered by
PPCTargetLowering::LowerGlobalTLSAddress(), and later lowered to
machine instructions LDgotTPREL and ADD8TLS.  LDgotTPREL is a pseudo
that uses the same LDrs support added for medium code model's LDtocL,
with a different relocation type.

The rest of the processing is straightforward.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169281 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-04 16:18:08 +00:00
..
MCDisassembler Sort includes for all of the .h files under the 'lib' tree. These were 2012-12-04 07:12:27 +00:00
MCParser Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
CMakeLists.txt
ELFObjectWriter.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
LLVMBuild.txt
MachObjectWriter.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
Makefile
MCAsmBackend.cpp
MCAsmInfo.cpp
MCAsmInfoCOFF.cpp
MCAsmInfoDarwin.cpp
MCAsmStreamer.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCAssembler.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCAtom.cpp
MCCodeEmitter.cpp
MCCodeGenInfo.cpp
MCContext.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCDisassembler.cpp
MCDwarf.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCELF.cpp
MCELF.h
MCELFObjectTargetWriter.cpp
MCELFStreamer.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCExpr.cpp This patch introduces initial-exec model support for thread-local storage 2012-12-04 16:18:08 +00:00
MCInst.cpp
MCInstPrinter.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCInstrAnalysis.cpp
MCLabel.cpp
MCMachObjectTargetWriter.cpp
MCMachOStreamer.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCModule.cpp
MCNullStreamer.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCObjectFileInfo.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCObjectStreamer.cpp
MCObjectWriter.cpp
MCPureStreamer.cpp
MCRegisterInfo.cpp
MCSection.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCSectionCOFF.cpp
MCSectionELF.cpp
MCSectionMachO.cpp
MCStreamer.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCSubtargetInfo.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
MCSymbol.cpp
MCTargetAsmLexer.cpp
MCValue.cpp
MCWin64EH.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
SubtargetFeature.cpp
WinCOFFObjectWriter.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
WinCOFFStreamer.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00