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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
autoconf Fix a pasto. 2012-11-19 19:31:02 +00:00
bindings [python] Add markup option to disassembler 2012-12-01 21:57:30 +00:00
cmake Removing SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG 2012-11-26 02:02:08 +00:00
docs Update release notes for NVPTX 2012-12-04 16:11:51 +00:00
examples Sort the #include lines of the examples/... tree. 2012-12-04 10:16:57 +00:00
include This patch introduces initial-exec model support for thread-local storage 2012-12-04 16:18:08 +00:00
lib This patch introduces initial-exec model support for thread-local storage 2012-12-04 16:18:08 +00:00
projects Clean up the sample include orderings, not that it really matters... 2012-12-04 10:46:21 +00:00
runtime
test This patch introduces initial-exec model support for thread-local storage 2012-12-04 16:18:08 +00:00
tools Sort the #include lines for tools/... 2012-12-04 10:44:52 +00:00
unittests Sort the #include lines for unittest/... 2012-12-04 10:23:08 +00:00
utils KillTheDoctor.cpp: Restore Win32 SDK headers before r169251. 2012-12-04 11:34:27 +00:00
.arcconfig Add .arcconfig to the repository. Useful if someone wants to use phabricator's command line tool. 2012-12-01 12:07:58 +00:00
.gitignore
CMakeLists.txt Kick off 3.3 cycle for LLVM trunk. 2012-11-17 22:01:08 +00:00
CODE_OWNERS.TXT clarify that this isn't lld. 2012-12-03 16:08:32 +00:00
configure Fix a pasto. 2012-11-19 19:31:02 +00:00
CREDITS.TXT Update my email address. 2012-11-29 21:17:26 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in
Makefile.rules
README.txt Test commit. 2012-11-29 16:19:11 +00:00

README.txt 

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