From ca4a0c9dbdbf6bf4a51da2577b1f7c659c74e024 Mon Sep 17 00:00:00 2001 From: Bill Schmidt Date: Tue, 4 Dec 2012 16:18:08 +0000 Subject: 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 --- llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp') diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp index 997465e97f6..462d7072b56 100644 --- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp +++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp @@ -119,8 +119,14 @@ unsigned PPCELFObjectWriter::getRelocTypeInner(const MCValue &Target, case MCSymbolRefExpr::VK_PPC_TOC16_LO: Type = ELF::R_PPC64_TOC16_LO_DS; break; + case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_DS: + Type = ELF::R_PPC64_GOT_TPREL16_DS; + break; } break; + case PPC::fixup_ppc_tlsreg: + Type = ELF::R_PPC64_TLS; + break; case FK_Data_8: switch (Modifier) { default: llvm_unreachable("Unsupported Modifier"); -- cgit v1.2.3