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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/Support/ELF.h | |
| parent | 315f09f422a3c33a44e6d5c2a78f284a9304994d (diff) | |
| download | llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.gz llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.bz2 llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.xz | |
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/Support/ELF.h')
| -rw-r--r-- | include/llvm/Support/ELF.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/llvm/Support/ELF.h b/include/llvm/Support/ELF.h index 18f8d6dfb1..0614a14cc8 100644 --- a/include/llvm/Support/ELF.h +++ b/include/llvm/Support/ELF.h @@ -476,7 +476,9 @@ enum { R_PPC64_TOC16_HA = 50, R_PPC64_TOC = 51, R_PPC64_TOC16_DS = 63, - R_PPC64_TOC16_LO_DS = 64 + R_PPC64_TOC16_LO_DS = 64, + R_PPC64_TLS = 67, + R_PPC64_GOT_TPREL16_DS = 87 }; // ARM Specific e_flags |