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-rw-r--r--ELF/Thunks.cpp208
1 files changed, 101 insertions, 107 deletions
diff --git a/ELF/Thunks.cpp b/ELF/Thunks.cpp
index 397a0ee66319..307ca5df2288 100644
--- a/ELF/Thunks.cpp
+++ b/ELF/Thunks.cpp
@@ -28,6 +28,7 @@
#include "Memory.h"
#include "OutputSections.h"
#include "Symbols.h"
+#include "SyntheticSections.h"
#include "Target.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ELF.h"
@@ -49,127 +50,159 @@ namespace {
// Specific ARM Thunk implementations. The naming convention is:
// Source State, TargetState, Target Requirement, ABS or PI, Range
-template <class ELFT>
-class ARMToThumbV7ABSLongThunk final : public Thunk<ELFT> {
+template <class ELFT> class ARMV7ABSLongThunk final : public Thunk {
public:
- ARMToThumbV7ABSLongThunk(const SymbolBody &Dest,
- const InputSection<ELFT> &Owner)
- : Thunk<ELFT>(Dest, Owner) {}
+ ARMV7ABSLongThunk(const SymbolBody &Dest) : Thunk(Dest) {}
uint32_t size() const override { return 12; }
- void writeTo(uint8_t *Buf) const override;
+ void writeTo(uint8_t *Buf, ThunkSection &IS) const override;
+ void addSymbols(ThunkSection &IS) override;
};
-template <class ELFT> class ARMToThumbV7PILongThunk final : public Thunk<ELFT> {
+template <class ELFT> class ARMV7PILongThunk final : public Thunk {
public:
- ARMToThumbV7PILongThunk(const SymbolBody &Dest,
- const InputSection<ELFT> &Owner)
- : Thunk<ELFT>(Dest, Owner) {}
+ ARMV7PILongThunk(const SymbolBody &Dest) : Thunk(Dest) {}
uint32_t size() const override { return 16; }
- void writeTo(uint8_t *Buf) const override;
+ void writeTo(uint8_t *Buf, ThunkSection &IS) const override;
+ void addSymbols(ThunkSection &IS) override;
};
-template <class ELFT>
-class ThumbToARMV7ABSLongThunk final : public Thunk<ELFT> {
+template <class ELFT> class ThumbV7ABSLongThunk final : public Thunk {
public:
- ThumbToARMV7ABSLongThunk(const SymbolBody &Dest,
- const InputSection<ELFT> &Owner)
- : Thunk<ELFT>(Dest, Owner) {}
+ ThumbV7ABSLongThunk(const SymbolBody &Dest) : Thunk(Dest) {
+ this->alignment = 2;
+ }
uint32_t size() const override { return 10; }
- void writeTo(uint8_t *Buf) const override;
+ void writeTo(uint8_t *Buf, ThunkSection &IS) const override;
+ void addSymbols(ThunkSection &IS) override;
};
-template <class ELFT> class ThumbToARMV7PILongThunk final : public Thunk<ELFT> {
+template <class ELFT> class ThumbV7PILongThunk final : public Thunk {
public:
- ThumbToARMV7PILongThunk(const SymbolBody &Dest,
- const InputSection<ELFT> &Owner)
- : Thunk<ELFT>(Dest, Owner) {}
+ ThumbV7PILongThunk(const SymbolBody &Dest) : Thunk(Dest) {
+ this->alignment = 2;
+ }
uint32_t size() const override { return 12; }
- void writeTo(uint8_t *Buf) const override;
+ void writeTo(uint8_t *Buf, ThunkSection &IS) const override;
+ void addSymbols(ThunkSection &IS) override;
};
// MIPS LA25 thunk
-template <class ELFT> class MipsThunk final : public Thunk<ELFT> {
+template <class ELFT> class MipsThunk final : public Thunk {
public:
- MipsThunk(const SymbolBody &Dest, const InputSection<ELFT> &Owner)
- : Thunk<ELFT>(Dest, Owner) {}
+ MipsThunk(const SymbolBody &Dest) : Thunk(Dest) {}
uint32_t size() const override { return 16; }
- void writeTo(uint8_t *Buf) const override;
+ void writeTo(uint8_t *Buf, ThunkSection &IS) const override;
+ void addSymbols(ThunkSection &IS) override;
+ InputSection *getTargetInputSection() const override;
};
} // end anonymous namespace
// ARM Target Thunks
-template <class ELFT> static uint64_t getARMThunkDestVA(const SymbolBody &S) {
- uint64_t V = S.isInPlt() ? S.getPltVA<ELFT>() : S.getVA<ELFT>();
+static uint64_t getARMThunkDestVA(const SymbolBody &S) {
+ uint64_t V = S.isInPlt() ? S.getPltVA() : S.getVA();
return SignExtend64<32>(V);
}
template <class ELFT>
-void ARMToThumbV7ABSLongThunk<ELFT>::writeTo(uint8_t *Buf) const {
+void ARMV7ABSLongThunk<ELFT>::writeTo(uint8_t *Buf, ThunkSection &IS) const {
const uint8_t Data[] = {
0x00, 0xc0, 0x00, 0xe3, // movw ip,:lower16:S
0x00, 0xc0, 0x40, 0xe3, // movt ip,:upper16:S
0x1c, 0xff, 0x2f, 0xe1, // bx ip
};
- uint64_t S = getARMThunkDestVA<ELFT>(this->Destination);
+ uint64_t S = getARMThunkDestVA(this->Destination);
memcpy(Buf, Data, sizeof(Data));
Target->relocateOne(Buf, R_ARM_MOVW_ABS_NC, S);
Target->relocateOne(Buf + 4, R_ARM_MOVT_ABS, S);
}
template <class ELFT>
-void ThumbToARMV7ABSLongThunk<ELFT>::writeTo(uint8_t *Buf) const {
+void ARMV7ABSLongThunk<ELFT>::addSymbols(ThunkSection &IS) {
+ this->ThunkSym = addSyntheticLocal<ELFT>(
+ Saver.save("__ARMv7ABSLongThunk_" + this->Destination.getName()),
+ STT_FUNC, this->Offset, size(), &IS);
+ addSyntheticLocal<ELFT>("$a", STT_NOTYPE, this->Offset, 0, &IS);
+}
+
+template <class ELFT>
+void ThumbV7ABSLongThunk<ELFT>::writeTo(uint8_t *Buf, ThunkSection &IS) const {
const uint8_t Data[] = {
0x40, 0xf2, 0x00, 0x0c, // movw ip, :lower16:S
0xc0, 0xf2, 0x00, 0x0c, // movt ip, :upper16:S
0x60, 0x47, // bx ip
};
- uint64_t S = getARMThunkDestVA<ELFT>(this->Destination);
+ uint64_t S = getARMThunkDestVA(this->Destination);
memcpy(Buf, Data, sizeof(Data));
Target->relocateOne(Buf, R_ARM_THM_MOVW_ABS_NC, S);
Target->relocateOne(Buf + 4, R_ARM_THM_MOVT_ABS, S);
}
template <class ELFT>
-void ARMToThumbV7PILongThunk<ELFT>::writeTo(uint8_t *Buf) const {
+void ThumbV7ABSLongThunk<ELFT>::addSymbols(ThunkSection &IS) {
+ this->ThunkSym = addSyntheticLocal<ELFT>(
+ Saver.save("__Thumbv7ABSLongThunk_" + this->Destination.getName()),
+ STT_FUNC, this->Offset, size(), &IS);
+ addSyntheticLocal<ELFT>("$t", STT_NOTYPE, this->Offset, 0, &IS);
+}
+
+template <class ELFT>
+void ARMV7PILongThunk<ELFT>::writeTo(uint8_t *Buf, ThunkSection &IS) const {
const uint8_t Data[] = {
0xf0, 0xcf, 0x0f, 0xe3, // P: movw ip,:lower16:S - (P + (L1-P) +8)
0x00, 0xc0, 0x40, 0xe3, // movt ip,:upper16:S - (P + (L1-P+4) +8)
0x0f, 0xc0, 0x8c, 0xe0, // L1: add ip, ip, pc
0x1c, 0xff, 0x2f, 0xe1, // bx r12
};
- uint64_t S = getARMThunkDestVA<ELFT>(this->Destination);
- uint64_t P = this->getVA();
+ uint64_t S = getARMThunkDestVA(this->Destination);
+ uint64_t P = this->ThunkSym->getVA();
memcpy(Buf, Data, sizeof(Data));
Target->relocateOne(Buf, R_ARM_MOVW_PREL_NC, S - P - 16);
Target->relocateOne(Buf + 4, R_ARM_MOVT_PREL, S - P - 12);
}
template <class ELFT>
-void ThumbToARMV7PILongThunk<ELFT>::writeTo(uint8_t *Buf) const {
+void ARMV7PILongThunk<ELFT>::addSymbols(ThunkSection &IS) {
+ this->ThunkSym = addSyntheticLocal<ELFT>(
+ Saver.save("__ARMV7PILongThunk_" + this->Destination.getName()), STT_FUNC,
+ this->Offset, size(), &IS);
+ addSyntheticLocal<ELFT>("$a", STT_NOTYPE, this->Offset, 0, &IS);
+}
+
+template <class ELFT>
+void ThumbV7PILongThunk<ELFT>::writeTo(uint8_t *Buf, ThunkSection &IS) const {
const uint8_t Data[] = {
0x4f, 0xf6, 0xf4, 0x7c, // P: movw ip,:lower16:S - (P + (L1-P) + 4)
0xc0, 0xf2, 0x00, 0x0c, // movt ip,:upper16:S - (P + (L1-P+4) + 4)
0xfc, 0x44, // L1: add r12, pc
0x60, 0x47, // bx r12
};
- uint64_t S = getARMThunkDestVA<ELFT>(this->Destination);
- uint64_t P = this->getVA();
+ uint64_t S = getARMThunkDestVA(this->Destination);
+ uint64_t P = this->ThunkSym->getVA();
memcpy(Buf, Data, sizeof(Data));
Target->relocateOne(Buf, R_ARM_THM_MOVW_PREL_NC, S - P - 12);
Target->relocateOne(Buf + 4, R_ARM_THM_MOVT_PREL, S - P - 8);
}
+template <class ELFT>
+void ThumbV7PILongThunk<ELFT>::addSymbols(ThunkSection &IS) {
+ this->ThunkSym = addSyntheticLocal<ELFT>(
+ Saver.save("__ThumbV7PILongThunk_" + this->Destination.getName()),
+ STT_FUNC, this->Offset, size(), &IS);
+ addSyntheticLocal<ELFT>("$t", STT_NOTYPE, this->Offset, 0, &IS);
+}
+
// Write MIPS LA25 thunk code to call PIC function from the non-PIC one.
-template <class ELFT> void MipsThunk<ELFT>::writeTo(uint8_t *Buf) const {
+template <class ELFT>
+void MipsThunk<ELFT>::writeTo(uint8_t *Buf, ThunkSection &) const {
const endianness E = ELFT::TargetEndianness;
- uint64_t S = this->Destination.template getVA<ELFT>();
+ uint64_t S = this->Destination.getVA();
write32<E>(Buf, 0x3c190000); // lui $25, %hi(func)
write32<E>(Buf + 4, 0x08000000 | (S >> 2)); // j func
write32<E>(Buf + 8, 0x27390000); // addiu $25, $25, %lo(func)
@@ -178,20 +211,24 @@ template <class ELFT> void MipsThunk<ELFT>::writeTo(uint8_t *Buf) const {
Target->relocateOne(Buf + 8, R_MIPS_LO16, S);
}
-template <class ELFT>
-Thunk<ELFT>::Thunk(const SymbolBody &D, const InputSection<ELFT> &O)
- : Destination(D), Owner(O), Offset(O.getThunkOff() + O.getThunksSize()) {}
+template <class ELFT> void MipsThunk<ELFT>::addSymbols(ThunkSection &IS) {
+ this->ThunkSym = addSyntheticLocal<ELFT>(
+ Saver.save("__LA25Thunk_" + this->Destination.getName()), STT_FUNC,
+ this->Offset, size(), &IS);
+}
-template <class ELFT> typename ELFT::uint Thunk<ELFT>::getVA() const {
- return Owner.OutSec->Addr + Owner.OutSecOff + Offset;
+template <class ELFT>
+InputSection *MipsThunk<ELFT>::getTargetInputSection() const {
+ auto *DR = dyn_cast<DefinedRegular>(&this->Destination);
+ return dyn_cast<InputSection>(DR->Section);
}
-template <class ELFT> Thunk<ELFT>::~Thunk() = default;
+Thunk::Thunk(const SymbolBody &D) : Destination(D), Offset(0) {}
+
+Thunk::~Thunk() = default;
// Creates a thunk for Thumb-ARM interworking.
-template <class ELFT>
-static Thunk<ELFT> *createThunkArm(uint32_t Reloc, SymbolBody &S,
- InputSection<ELFT> &IS) {
+template <class ELFT> static Thunk *addThunkArm(uint32_t Reloc, SymbolBody &S) {
// ARM relocations need ARM to Thumb interworking Thunks.
// Thumb relocations need Thumb to ARM relocations.
// Use position independent Thunks if we require position independent code.
@@ -200,76 +237,33 @@ static Thunk<ELFT> *createThunkArm(uint32_t Reloc, SymbolBody &S,
case R_ARM_PLT32:
case R_ARM_JUMP24:
if (Config->Pic)
- return new (BAlloc) ARMToThumbV7PILongThunk<ELFT>(S, IS);
- return new (BAlloc) ARMToThumbV7ABSLongThunk<ELFT>(S, IS);
+ return make<ARMV7PILongThunk<ELFT>>(S);
+ return make<ARMV7ABSLongThunk<ELFT>>(S);
case R_ARM_THM_JUMP19:
case R_ARM_THM_JUMP24:
if (Config->Pic)
- return new (BAlloc) ThumbToARMV7PILongThunk<ELFT>(S, IS);
- return new (BAlloc) ThumbToARMV7ABSLongThunk<ELFT>(S, IS);
+ return make<ThumbV7PILongThunk<ELFT>>(S);
+ return make<ThumbV7ABSLongThunk<ELFT>>(S);
}
fatal("unrecognized relocation type");
}
-template <class ELFT>
-static void addThunkARM(uint32_t Reloc, SymbolBody &S, InputSection<ELFT> &IS) {
- // Only one Thunk supported per symbol.
- if (S.hasThunk<ELFT>())
- return;
-
- // ARM Thunks are added to the same InputSection as the relocation. This
- // isn't strictly necessary but it makes it more likely that a limited range
- // branch can reach the Thunk, and it makes Thunks to the PLT section easier
- Thunk<ELFT> *T = createThunkArm(Reloc, S, IS);
- IS.addThunk(T);
- if (auto *Sym = dyn_cast<DefinedRegular<ELFT>>(&S))
- Sym->ThunkData = T;
- else if (auto *Sym = dyn_cast<SharedSymbol<ELFT>>(&S))
- Sym->ThunkData = T;
- else if (auto *Sym = dyn_cast<Undefined<ELFT>>(&S))
- Sym->ThunkData = T;
- else
- fatal("symbol not DefinedRegular or Shared");
-}
-
-template <class ELFT>
-static void addThunkMips(uint32_t RelocType, SymbolBody &S,
- InputSection<ELFT> &IS) {
- // Only one Thunk supported per symbol.
- if (S.hasThunk<ELFT>())
- return;
-
- // Mips Thunks are added to the InputSection defining S.
- auto *R = cast<DefinedRegular<ELFT>>(&S);
- auto *Sec = cast<InputSection<ELFT>>(R->Section);
- auto *T = new (BAlloc) MipsThunk<ELFT>(S, *Sec);
- Sec->addThunk(T);
- R->ThunkData = T;
+template <class ELFT> static Thunk *addThunkMips(SymbolBody &S) {
+ return make<MipsThunk<ELFT>>(S);
}
-template <class ELFT>
-void addThunk(uint32_t RelocType, SymbolBody &S, InputSection<ELFT> &IS) {
+template <class ELFT> Thunk *addThunk(uint32_t RelocType, SymbolBody &S) {
if (Config->EMachine == EM_ARM)
- addThunkARM<ELFT>(RelocType, S, IS);
+ return addThunkArm<ELFT>(RelocType, S);
else if (Config->EMachine == EM_MIPS)
- addThunkMips<ELFT>(RelocType, S, IS);
- else
- llvm_unreachable("add Thunk only supported for ARM and Mips");
+ return addThunkMips<ELFT>(S);
+ llvm_unreachable("add Thunk only supported for ARM and Mips");
+ return nullptr;
}
-template void addThunk<ELF32LE>(uint32_t, SymbolBody &,
- InputSection<ELF32LE> &);
-template void addThunk<ELF32BE>(uint32_t, SymbolBody &,
- InputSection<ELF32BE> &);
-template void addThunk<ELF64LE>(uint32_t, SymbolBody &,
- InputSection<ELF64LE> &);
-template void addThunk<ELF64BE>(uint32_t, SymbolBody &,
- InputSection<ELF64BE> &);
-
-template class Thunk<ELF32LE>;
-template class Thunk<ELF32BE>;
-template class Thunk<ELF64LE>;
-template class Thunk<ELF64BE>;
-
+template Thunk *addThunk<ELF32LE>(uint32_t, SymbolBody &);
+template Thunk *addThunk<ELF32BE>(uint32_t, SymbolBody &);
+template Thunk *addThunk<ELF64LE>(uint32_t, SymbolBody &);
+template Thunk *addThunk<ELF64BE>(uint32_t, SymbolBody &);
} // end namespace elf
} // end namespace lld
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