diff options
Diffstat (limited to 'lld/ELF/Thunks.cpp')
| -rw-r--r-- | lld/ELF/Thunks.cpp | 45 |
1 files changed, 41 insertions, 4 deletions
diff --git a/lld/ELF/Thunks.cpp b/lld/ELF/Thunks.cpp index 7b927a434e36..f9c2e2d74e0a 100644 --- a/lld/ELF/Thunks.cpp +++ b/lld/ELF/Thunks.cpp @@ -245,8 +245,7 @@ public: // decide the offsets in the call stub. PPC32PltCallStub(const InputSection &isec, const Relocation &rel, Symbol &dest) - : Thunk(dest, rel.type == R_PPC_PLTREL24 ? rel.addend : 0), - file(isec.file) {} + : Thunk(dest, rel.addend), file(isec.file) {} uint32_t size() override { return 16; } void writeTo(uint8_t *buf) override; void addSymbols(ThunkSection &isec) override; @@ -257,6 +256,14 @@ private: const InputFile *file; }; +class PPC32LongThunk final : public Thunk { +public: + PPC32LongThunk(Symbol &dest, int64_t addend) : Thunk(dest, addend) {} + uint32_t size() override { return config->isPic ? 32 : 16; } + void writeTo(uint8_t *buf) override; + void addSymbols(ThunkSection &isec) override; +}; + // PPC64 Plt call stubs. // Any call site that needs to call through a plt entry needs a call stub in // the .text section. The call stub is responsible for: @@ -765,6 +772,33 @@ bool PPC32PltCallStub::isCompatibleWith(const InputSection &isec, return !config->isPic || (isec.file == file && rel.addend == addend); } +void PPC32LongThunk::addSymbols(ThunkSection &isec) { + addSymbol(saver.save("__LongThunk_" + destination.getName()), STT_FUNC, 0, + isec); +} + +void PPC32LongThunk::writeTo(uint8_t *buf) { + auto ha = [](uint32_t v) -> uint16_t { return (v + 0x8000) >> 16; }; + auto lo = [](uint32_t v) -> uint16_t { return v; }; + uint32_t d = destination.getVA(addend); + if (config->isPic) { + uint32_t off = d - (getThunkTargetSym()->getVA() + 8); + write32(buf + 0, 0x7c0802a6); // mflr r12,0 + write32(buf + 4, 0x429f0005); // bcl r20,r31,.+4 + write32(buf + 8, 0x7d8802a6); // mtctr r12 + write32(buf + 12, 0x3d8c0000 | ha(off)); // addis r12,r12,off@ha + write32(buf + 16, 0x398c0000 | lo(off)); // addi r12,r12,off@l + write32(buf + 20, 0x7c0803a6); // mtlr r0 + buf += 24; + } else { + write32(buf + 0, 0x3d800000 | ha(d)); // lis r12,d@ha + write32(buf + 4, 0x398c0000 | lo(d)); // addi r12,r12,d@l + buf += 8; + } + write32(buf + 0, 0x7d8903a6); // mtctr r12 + write32(buf + 4, 0x4e800420); // bctr +} + void writePPC64LoadAndBranch(uint8_t *buf, int64_t offset) { uint16_t offHa = (offset + 0x8000) >> 16; uint16_t offLo = offset & 0xffff; @@ -902,9 +936,12 @@ static Thunk *addThunkMips(RelType type, Symbol &s) { static Thunk *addThunkPPC32(const InputSection &isec, const Relocation &rel, Symbol &s) { - assert((rel.type == R_PPC_REL24 || rel.type == R_PPC_PLTREL24) && + assert((rel.type == R_PPC_LOCAL24PC || rel.type == R_PPC_REL24 || + rel.type == R_PPC_PLTREL24) && "unexpected relocation type for thunk"); - return make<PPC32PltCallStub>(isec, rel, s); + if (s.isInPlt()) + return make<PPC32PltCallStub>(isec, rel, s); + return make<PPC32LongThunk>(s, rel.addend); } static Thunk *addThunkPPC64(RelType type, Symbol &s, int64_t a) { |