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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 /lib/Target/PowerPC/PPC.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 'lib/Target/PowerPC/PPC.h')
| -rw-r--r-- | lib/Target/PowerPC/PPC.h | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/lib/Target/PowerPC/PPC.h b/lib/Target/PowerPC/PPC.h index 9103e12325..bbd247f20f 100644 --- a/lib/Target/PowerPC/PPC.h +++ b/lib/Target/PowerPC/PPC.h @@ -65,13 +65,16 @@ namespace llvm { MO_NLP_HIDDEN_FLAG = 16, /// The next are not flags but distinct values. - MO_ACCESS_MASK = 224, + MO_ACCESS_MASK = 0xe0, /// MO_LO16, MO_HA16 - lo16(symbol) and ha16(symbol) - MO_LO16 = 32, MO_HA16 = 64, + MO_LO16 = 1 << 5, + MO_HA16 = 2 << 5, - MO_TPREL16_HA = 96, - MO_TPREL16_LO = 128 + MO_TPREL16_HA = 3 << 5, + MO_TPREL16_LO = 4 << 5, + MO_GOT_TPREL16_DS = 5 << 5, + MO_TLS = 6 << 5 }; } // end namespace PPCII |