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author | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2012-12-04 16:18:08 +0000 |
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committer | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2012-12-04 16:18:08 +0000 |
commit | d7802bf0ddcac16ee910105922492aee86a53e1b (patch) | |
tree | 693685ea4b0a01cef8c62f4f595f9a6e6712c197 /lib/Target/PowerPC/PPCCodeEmitter.cpp | |
parent | 315f09f422a3c33a44e6d5c2a78f284a9304994d (diff) | |
download | llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.gz llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.bz2 llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.xz |
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
Diffstat (limited to 'lib/Target/PowerPC/PPCCodeEmitter.cpp')
-rw-r--r-- | lib/Target/PowerPC/PPCCodeEmitter.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCCodeEmitter.cpp b/lib/Target/PowerPC/PPCCodeEmitter.cpp index 7b37dff2c9..0dcb5deb5d 100644 --- a/lib/Target/PowerPC/PPCCodeEmitter.cpp +++ b/lib/Target/PowerPC/PPCCodeEmitter.cpp @@ -68,6 +68,8 @@ namespace { unsigned getLO16Encoding(const MachineInstr &MI, unsigned OpNo) const; unsigned getMemRIEncoding(const MachineInstr &MI, unsigned OpNo) const; unsigned getMemRIXEncoding(const MachineInstr &MI, unsigned OpNo) const; + unsigned getTLSOffsetEncoding(const MachineInstr &MI, unsigned OpNo) const; + unsigned getTLSRegEncoding(const MachineInstr &MI, unsigned OpNo) const; const char *getPassName() const { return "PowerPC Machine Code Emitter"; } @@ -243,6 +245,20 @@ unsigned PPCCodeEmitter::getMemRIXEncoding(const MachineInstr &MI, } +unsigned PPCCodeEmitter::getTLSOffsetEncoding(const MachineInstr &MI, + unsigned OpNo) const { + llvm_unreachable("TLS not supported on the old JIT."); + return 0; +} + + +unsigned PPCCodeEmitter::getTLSRegEncoding(const MachineInstr &MI, + unsigned OpNo) const { + llvm_unreachable("TLS not supported on the old JIT."); + return 0; +} + + unsigned PPCCodeEmitter::getMachineOpValue(const MachineInstr &MI, const MachineOperand &MO) const { |