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authorBill Schmidt <wschmidt@linux.vnet.ibm.com>2012-12-04 16:18:08 +0000
committerBill Schmidt <wschmidt@linux.vnet.ibm.com>2012-12-04 16:18:08 +0000
commitca4a0c9dbdbf6bf4a51da2577b1f7c659c74e024 (patch)
tree6decf10d400453b5e8ded293a63627752adfb25f /lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.h
parented7d8d5500f3a6b314e96fecec01252f951b8273 (diff)
downloadbcm5719-llvm-ca4a0c9dbdbf6bf4a51da2577b1f7c659c74e024.tar.gz
bcm5719-llvm-ca4a0c9dbdbf6bf4a51da2577b1f7c659c74e024.zip
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
Diffstat (limited to 'lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.h')
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