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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 | ca4a0c9dbdbf6bf4a51da2577b1f7c659c74e024 (patch) | |
tree | 6decf10d400453b5e8ded293a63627752adfb25f /lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.h | |
parent | ed7d8d5500f3a6b314e96fecec01252f951b8273 (diff) | |
download | bcm5719-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')
0 files changed, 0 insertions, 0 deletions