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
diff --git a/lib/Target/PowerPC/PPCCodeEmitter.cpp b/lib/Target/PowerPC/PPCCodeEmitter.cpp
index 7b37dff..0dcb5de 100644
--- a/lib/Target/PowerPC/PPCCodeEmitter.cpp
+++ b/lib/Target/PowerPC/PPCCodeEmitter.cpp
@@ -68,6 +68,8 @@
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::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 {