diff options
| author | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2012-12-14 17:02:38 +0000 |
|---|---|---|
| committer | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2012-12-14 17:02:38 +0000 |
| commit | b453e16855f347e300f1dc0cd0dfbdd65c27b0d2 (patch) | |
| tree | b743e0bbee0e4509e09b0b4cbc19b2d4e5d14113 /lib/MC/MCExpr.cpp | |
| parent | 79c3742620efccf7c36ea1738bb121ad70d644d0 (diff) | |
This patch improves the 64-bit PowerPC InitialExec TLS support by providing
for a wider range of GOT entries that can hold thread-relative offsets.
This matches the behavior of GCC, which was not documented in the PPC64 TLS
ABI. The ABI will be updated with the new code sequence.
Former sequence:
ld 9,x@got@tprel(2)
add 9,9,x@tls
New sequence:
addis 9,2,x@got@tprel@ha
ld 9,x@got@tprel@l(9)
add 9,9,x@tls
Note that a linker optimization exists to transform the new sequence into
the shorter sequence when appropriate, by replacing the addis with a nop
and modifying the base register and relocation type of the ld.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170209 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/MC/MCExpr.cpp')
| -rw-r--r-- | lib/MC/MCExpr.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/MC/MCExpr.cpp b/lib/MC/MCExpr.cpp index cbb8a8583d..1a53934fef 100644 --- a/lib/MC/MCExpr.cpp +++ b/lib/MC/MCExpr.cpp @@ -217,7 +217,8 @@ StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) { case VK_PPC_DTPREL16_LO: return "dtprel@l"; case VK_PPC_TOC16_HA: return "toc@ha"; case VK_PPC_TOC16_LO: return "toc@l"; - case VK_PPC_GOT_TPREL16_DS: return "got@tprel"; + case VK_PPC_GOT_TPREL16_HA: return "got@tprel@ha"; + case VK_PPC_GOT_TPREL16_LO: return "got@tprel@l"; case VK_PPC_TLS: return "tls"; case VK_PPC_GOT_TLSGD16_HA: return "got@tlsgd@ha"; case VK_PPC_GOT_TLSGD16_LO: return "got@tlsgd@l"; |