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| author | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2012-12-04 16:18:08 +0000 |
|---|---|---|
| committer | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2012-12-04 16:18:08 +0000 |
| commit | d7802bf0ddcac16ee910105922492aee86a53e1b (patch) | |
| tree | 693685ea4b0a01cef8c62f4f595f9a6e6712c197 /include/llvm/MC | |
| parent | 315f09f422a3c33a44e6d5c2a78f284a9304994d (diff) | |
| download | external_llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.zip external_llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.gz external_llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.bz2 | |
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
Diffstat (limited to 'include/llvm/MC')
| -rw-r--r-- | include/llvm/MC/MCExpr.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/llvm/MC/MCExpr.h b/include/llvm/MC/MCExpr.h index fbaa740..93872ed 100644 --- a/include/llvm/MC/MCExpr.h +++ b/include/llvm/MC/MCExpr.h @@ -179,6 +179,8 @@ public: VK_PPC_TPREL16_LO, // symbol@tprel@l VK_PPC_TOC16_HA, // symbol@toc@ha VK_PPC_TOC16_LO, // symbol@toc@l + VK_PPC_GOT_TPREL16_DS, // symbol@got@tprel + VK_PPC_TLS, // symbol@tls VK_Mips_GPREL, VK_Mips_GOT_CALL, |