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llvm-project/llvm/lib/Target/PowerPC/MCTargetDesc
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Bill Schmidt ca4a0c9dbd 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.

llvm-svn: 169281
 		2012-12-04 16:18:08 +00:00
..
CMakeLists.txt Fix cmake. 2011-12-22 02:06:17 +00:00
LLVMBuild.txt LLVMBuild: Remove trailing newline, which irked me. 2011-12-12 19:48:00 +00:00
Makefile
…
PPCAsmBackend.cpp This patch introduces initial-exec model support for thread-local storage 2012-12-04 16:18:08 +00:00
PPCBaseInfo.h Emacs-tag and some comment fix for all ARM, CellSPU, Hexagon, MBlaze, MSP430, PPC, PTX, Sparc, X86, XCore. 2012-02-18 12:03:15 +00:00
PPCELFObjectWriter.cpp This patch introduces initial-exec model support for thread-local storage 2012-12-04 16:18:08 +00:00
PPCFixupKinds.h This patch introduces initial-exec model support for thread-local storage 2012-12-04 16:18:08 +00:00
PPCMCAsmInfo.cpp Enable exceptions handling on PPC64 now that cr misaligned spilling 2012-09-12 15:29:32 +00:00
PPCMCAsmInfo.h Emacs-tag and some comment fix for all ARM, CellSPU, Hexagon, MBlaze, MSP430, PPC, PTX, Sparc, X86, XCore. 2012-02-18 12:03:15 +00:00
PPCMCCodeEmitter.cpp This patch introduces initial-exec model support for thread-local storage 2012-12-04 16:18:08 +00:00
PPCMCTargetDesc.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
PPCMCTargetDesc.h When creating MCAsmBackend pass the CPU string as well. In X86AsmBackend 2012-09-18 16:08:49 +00:00
PPCPredicates.cpp Rename TargetAsmParser to MCTargetAsmParser and TargetAsmLexer to MCTargetAsmLexer; rename createAsmLexer to createMCAsmLexer and createAsmParser to createMCAsmParser. 2011-07-26 00:24:13 +00:00
PPCPredicates.h Rename TargetAsmParser to MCTargetAsmParser and TargetAsmLexer to MCTargetAsmLexer; rename createAsmLexer to createMCAsmLexer and createAsmParser to createMCAsmParser. 2011-07-26 00:24:13 +00:00