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/PPCISelLowering.h b/lib/Target/PowerPC/PPCISelLowering.h
index c20356c..f54a8b7 100644
--- a/lib/Target/PowerPC/PPCISelLowering.h
+++ b/lib/Target/PowerPC/PPCISelLowering.h
@@ -178,6 +178,20 @@
CR6SET,
CR6UNSET,
+ /// G8RC = LD_GOT_TPREL Symbol, G8RReg - Used by the initial-exec
+ /// TLS model, produces a LD instruction with base register G8RReg
+ /// and offset sym@got@tprel. The latter identifies the GOT entry
+ /// containing the offset of "sym" relative to the thread pointer.
+ LD_GOT_TPREL,
+
+ /// G8RC = ADD_TLS G8RReg, Symbol - Used by the initial-exec TLS
+ /// model, produces an ADD instruction that adds the contents of
+ /// G8RReg to the thread pointer. Symbol contains a relocation
+ /// sym@tls which is to be replaced by the thread pointer and
+ /// identifies to the linker that the instruction is part of a
+ /// TLS sequence.
+ ADD_TLS,
+
/// STD_32 - This is the STD instruction for use with "32-bit" registers.
STD_32 = ISD::FIRST_TARGET_MEMORY_OPCODE,