diff options
Diffstat (limited to 'lld/ELF/Arch/PPC64.cpp')
| -rw-r--r-- | lld/ELF/Arch/PPC64.cpp | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/lld/ELF/Arch/PPC64.cpp b/lld/ELF/Arch/PPC64.cpp index 4613179df16..884f1764e6f 100644 --- a/lld/ELF/Arch/PPC64.cpp +++ b/lld/ELF/Arch/PPC64.cpp @@ -113,6 +113,7 @@ public: void writeGotHeader(uint8_t *Buf) const override; bool needsThunk(RelExpr Expr, RelType Type, const InputFile *File, uint64_t BranchAddr, const Symbol &S) const override; + bool inBranchRange(RelType Type, uint64_t Src, uint64_t Dst) const override; RelExpr adjustRelaxExpr(RelType Type, const uint8_t *Data, RelExpr Expr) const override; void relaxTlsGdToIe(uint8_t *Loc, RelType Type, uint64_t Val) const override; @@ -709,9 +710,28 @@ void PPC64::relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const { bool PPC64::needsThunk(RelExpr Expr, RelType Type, const InputFile *File, uint64_t BranchAddr, const Symbol &S) const { - // If a function is in the plt it needs to be called through - // a call stub. - return Type == R_PPC64_REL24 && S.isInPlt(); + // The only call relocation we currently support is the REL24 type. + if (Type != R_PPC64_REL24) + return false; + + // If a function is in the Plt it needs to be called with a call-stub. + if (S.isInPlt()) + return true; + + // If a symbol is a weak undefined and we are compiling an executable + // it doesn't need a range-extending thunk since it can't be called. + if (S.isUndefWeak() && !Config->Shared) + return false; + + // If the offset exceeds the range of the branch type then it will need + // a range-extending thunk. + return !inBranchRange(Type, BranchAddr, S.getVA()); +} + +bool PPC64::inBranchRange(RelType Type, uint64_t Src, uint64_t Dst) const { + assert(Type == R_PPC64_REL24 && "Unexpected relocation type used in branch"); + int64_t Offset = Dst - Src; + return isInt<26>(Offset); } RelExpr PPC64::adjustRelaxExpr(RelType Type, const uint8_t *Data, |
