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Revert "[RuntimeDyldELF] Fold Placeholder into Addend"

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This reverts commit cbbeac14f0.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235082 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pavel Labath 2015-04-16 08:58:15 +00:00
parent e0eb40474c
commit 61cf1a8047
2 changed files with 188 additions and 178 deletions
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163
lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
View File

@ -247,16 +247,29 @@ void RuntimeDyldELF::resolveX86_64Relocation(const SectionEntry &Section,
break;
}
case ELF::R_X86_64_PC32: {
// Get the placeholder value from the generated object since
// a previous relocation attempt may have overwritten the loaded version
support::ulittle32_t::ref Placeholder(
(void *)(Section.ObjAddress + Offset));
uint64_t FinalAddress = Section.LoadAddress + Offset;
int64_t RealOffset = Value + Addend - FinalAddress;
// Don't add the placeholder if this is a stub
if (Offset < Section.Size)
RealOffset += Placeholder;
assert(RealOffset <= INT32_MAX && RealOffset >= INT32_MIN);
int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
support::ulittle32_t::ref(Section.Address + Offset) = TruncOffset;
break;
}
case ELF::R_X86_64_PC64: {
// Get the placeholder value from the generated object since
// a previous relocation attempt may have overwritten the loaded version
support::ulittle64_t::ref Placeholder(
(void *)(Section.ObjAddress + Offset));
uint64_t FinalAddress = Section.LoadAddress + Offset;
int64_t RealOffset = Value + Addend - FinalAddress;
if (Offset < Section.Size)
RealOffset += Placeholder;
support::ulittle64_t::ref(Section.Address + Offset) = RealOffset;
break;
}
@ -268,12 +281,21 @@ void RuntimeDyldELF::resolveX86Relocation(const SectionEntry &Section,
uint32_t Type, int32_t Addend) {
switch (Type) {
case ELF::R_386_32: {
support::ulittle32_t::ref(Section.Address + Offset) = Value + Addend;
// Get the placeholder value from the generated object since
// a previous relocation attempt may have overwritten the loaded version
support::ulittle32_t::ref Placeholder(
(void *)(Section.ObjAddress + Offset));
support::ulittle32_t::ref(Section.Address + Offset) =
Placeholder + Value + Addend;
break;
}
case ELF::R_386_PC32: {
// Get the placeholder value from the generated object since
// a previous relocation attempt may have overwritten the loaded version
support::ulittle32_t::ref Placeholder(
(void *)(Section.ObjAddress + Offset));
uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
uint32_t RealOffset = Value + Addend - FinalAddress;
uint32_t RealOffset = Placeholder + Value + Addend - FinalAddress;
support::ulittle32_t::ref(Section.Address + Offset) = RealOffset;
break;
}
@ -430,6 +452,8 @@ void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section,
uint64_t Offset, uint32_t Value,
uint32_t Type, int32_t Addend) {
// TODO: Add Thumb relocations.
uint32_t *Placeholder =
reinterpret_cast<uint32_t *>(Section.ObjAddress + Offset);
uint32_t *TargetPtr = (uint32_t *)(Section.Address + Offset);
uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
Value += Addend;
@ -446,27 +470,39 @@ void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section,
case ELF::R_ARM_NONE:
break;
// Write a 32bit value to relocation address, taking into account the
// implicit addend encoded in the target.
case ELF::R_ARM_PREL31:
case ELF::R_ARM_TARGET1:
case ELF::R_ARM_ABS32:
*TargetPtr = Value;
*TargetPtr = *Placeholder + Value;
break;
// Write first 16 bit of 32 bit value to the mov instruction.
// Last 4 bit should be shifted.
case ELF::R_ARM_MOVW_ABS_NC:
case ELF::R_ARM_MOVT_ABS:
if (Type == ELF::R_ARM_MOVW_ABS_NC)
// We are not expecting any other addend in the relocation address.
// Using 0x000F0FFF because MOVW has its 16 bit immediate split into 2
// non-contiguous fields.
assert((*Placeholder & 0x000F0FFF) == 0);
Value = Value & 0xFFFF;
else if (Type == ELF::R_ARM_MOVT_ABS)
*TargetPtr = *Placeholder | (Value & 0xFFF);
*TargetPtr |= ((Value >> 12) & 0xF) << 16;
break;
// Write last 16 bit of 32 bit value to the mov instruction.
// Last 4 bit should be shifted.
case ELF::R_ARM_MOVT_ABS:
// We are not expecting any other addend in the relocation address.
// Use 0x000F0FFF for the same reason as R_ARM_MOVW_ABS_NC.
assert((*Placeholder & 0x000F0FFF) == 0);
Value = (Value >> 16) & 0xFFFF;
*TargetPtr &= ~0x000F0FFF;
*TargetPtr = Value & 0xFFF;
*TargetPtr = *Placeholder | (Value & 0xFFF);
*TargetPtr |= ((Value >> 12) & 0xF) << 16;
break;
// Write 24 bit relative value to the branch instruction.
case ELF::R_ARM_PC24: // Fall through.
case ELF::R_ARM_CALL: // Fall through.
case ELF::R_ARM_JUMP24:
case ELF::R_ARM_JUMP24: {
int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8);
RelValue = (RelValue & 0x03FFFFFC) >> 2;
assert((*TargetPtr & 0xFFFFFF) == 0xFFFFFE);
@ -474,11 +510,21 @@ void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section,
*TargetPtr |= RelValue;
break;
}
case ELF::R_ARM_PRIVATE_0:
// This relocation is reserved by the ARM ELF ABI for internal use. We
// appropriate it here to act as an R_ARM_ABS32 without any addend for use
// in the stubs created during JIT (which can't put an addend into the
// original object file).
*TargetPtr = Value;
break;
}
}
void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section,
uint64_t Offset, uint32_t Value,
uint32_t Type, int32_t Addend) {
uint32_t *Placeholder =
reinterpret_cast<uint32_t *>(Section.ObjAddress + Offset);
uint32_t *TargetPtr = (uint32_t *)(Section.Address + Offset);
Value += Addend;
@ -493,17 +539,30 @@ void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section,
llvm_unreachable("Not implemented relocation type!");
break;
case ELF::R_MIPS_32:
*TargetPtr = Value;
*TargetPtr = Value + (*Placeholder);
break;
case ELF::R_MIPS_26:
*TargetPtr = ((*TargetPtr) & 0xfc000000) | ((Value & 0x0fffffff) >> 2);
*TargetPtr = ((*Placeholder) & 0xfc000000) | ((Value & 0x0fffffff) >> 2);
break;
case ELF::R_MIPS_HI16:
// Get the higher 16-bits. Also add 1 if bit 15 is 1.
Value += ((*Placeholder) & 0x0000ffff) << 16;
*TargetPtr =
((*Placeholder) & 0xffff0000) | (((Value + 0x8000) >> 16) & 0xffff);
break;
case ELF::R_MIPS_LO16:
Value += ((*Placeholder) & 0x0000ffff);
*TargetPtr = ((*Placeholder) & 0xffff0000) | (Value & 0xffff);
break;
case ELF::R_MIPS_UNUSED1:
// Similar to ELF::R_ARM_PRIVATE_0, R_MIPS_UNUSED1 and R_MIPS_UNUSED2
// are used for internal JIT purpose. These relocations are similar to
// R_MIPS_HI16 and R_MIPS_LO16, but they do not take any addend into
// account.
*TargetPtr =
((*TargetPtr) & 0xffff0000) | (((Value + 0x8000) >> 16) & 0xffff);
break;
case ELF::R_MIPS_LO16:
case ELF::R_MIPS_UNUSED2:
*TargetPtr = ((*TargetPtr) & 0xffff0000) | (Value & 0xffff);
break;
}
@ -829,18 +888,6 @@ void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section,
}
}
void *RuntimeDyldELF::computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const {
return (void*)(Sections[SectionID].ObjAddress + Offset);
}
void RuntimeDyldELF::processSimpleRelocation(unsigned SectionID, uint64_t Offset, unsigned RelType, RelocationValueRef Value) {
RelocationEntry RE(SectionID, Offset, RelType, Value.Addend, Value.Offset);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
}
relocation_iterator RuntimeDyldELF::processRelocationRef(
unsigned SectionID, relocation_iterator RelI,
const ObjectFile &Obj,
@ -958,9 +1005,9 @@ relocation_iterator RuntimeDyldELF::processRelocationRef(
0);
Section.StubOffset += getMaxStubSize();
}
} else if (Arch == Triple::arm) {
if (RelType == ELF::R_ARM_PC24 || RelType == ELF::R_ARM_CALL ||
RelType == ELF::R_ARM_JUMP24) {
} else if (Arch == Triple::arm &&
(RelType == ELF::R_ARM_PC24 || RelType == ELF::R_ARM_CALL ||
RelType == ELF::R_ARM_JUMP24)) {
// This is an ARM branch relocation, need to use a stub function.
DEBUG(dbgs() << "\t\tThis is an ARM branch relocation.");
SectionEntry &Section = Sections[SectionID];
@ -978,7 +1025,7 @@ relocation_iterator RuntimeDyldELF::processRelocationRef(
uint8_t *StubTargetAddr =
createStubFunction(Section.Address + Section.StubOffset);
RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
ELF::R_ARM_ABS32, Value.Addend);
ELF::R_ARM_PRIVATE_0, Value.Addend);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
@ -989,29 +1036,16 @@ relocation_iterator RuntimeDyldELF::processRelocationRef(
0);
Section.StubOffset += getMaxStubSize();
}
} else {
uint32_t *Placeholder =
reinterpret_cast<uint32_t*>(computePlaceholderAddress(SectionID, Offset));
if (RelType == ELF::R_ARM_PREL31 || RelType == ELF::R_ARM_TARGET1 ||
RelType == ELF::R_ARM_ABS32) {
Value.Addend += *Placeholder;
} else if (RelType == ELF::R_ARM_MOVW_ABS_NC || RelType == ELF::R_ARM_MOVT_ABS) {
// See ELF for ARM documentation
Value.Addend += (int16_t)((*Placeholder & 0xFFF) | (((*Placeholder >> 16) & 0xF) << 12));
}
processSimpleRelocation(SectionID, Offset, RelType, Value);
}
} else if ((Arch == Triple::mipsel || Arch == Triple::mips)) {
uint32_t *Placeholder = reinterpret_cast<uint32_t*>(computePlaceholderAddress(SectionID, Offset));
if (RelType == ELF::R_MIPS_26) {
} else if ((Arch == Triple::mipsel || Arch == Triple::mips) &&
RelType == ELF::R_MIPS_26) {
// This is an Mips branch relocation, need to use a stub function.
DEBUG(dbgs() << "\t\tThis is a Mips branch relocation.");
SectionEntry &Section = Sections[SectionID];
uint8_t *Target = Section.Address + Offset;
uint32_t *TargetAddress = (uint32_t *)Target;
// Extract the addend from the instruction.
// We shift up by two since the Value will be down shifted again
// when applying the relocation.
uint32_t Addend = ((*Placeholder) & 0x03ffffff) << 2;
uint32_t Addend = ((*TargetAddress) & 0x03ffffff) << 2;
Value.Addend += Addend;
@ -1030,15 +1064,14 @@ relocation_iterator RuntimeDyldELF::processRelocationRef(
// Creating Hi and Lo relocations for the filled stub instructions.
RelocationEntry REHi(SectionID, StubTargetAddr - Section.Address,
ELF::R_MIPS_HI16, Value.Addend);
ELF::R_MIPS_UNUSED1, Value.Addend);
RelocationEntry RELo(SectionID, StubTargetAddr - Section.Address + 4,
ELF::R_MIPS_LO16, Value.Addend);
ELF::R_MIPS_UNUSED2, Value.Addend);
if (Value.SymbolName) {
addRelocationForSymbol(REHi, Value.SymbolName);
addRelocationForSymbol(RELo, Value.SymbolName);
}
else {
} else {
addRelocationForSection(REHi, Value.SectionID);
addRelocationForSection(RELo, Value.SectionID);
}
@ -1047,13 +1080,6 @@ relocation_iterator RuntimeDyldELF::processRelocationRef(
addRelocationForSection(RE, SectionID);
Section.StubOffset += getMaxStubSize();
}
} else {
if (RelType == ELF::R_MIPS_HI16)
Value.Addend += ((*Placeholder) & 0x0000ffff) << 16;
else if (RelType == ELF::R_MIPS_LO16)
Value.Addend += ((*Placeholder) & 0x0000ffff);
processSimpleRelocation(SectionID, Offset, RelType, Value);
}
} else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
if (RelType == ELF::R_PPC64_REL24) {
// Determine ABI variant in use for this object.
@ -1251,8 +1277,7 @@ relocation_iterator RuntimeDyldELF::processRelocationRef(
Addend);
else
resolveRelocation(Section, Offset, StubAddress, RelType, Addend);
} else if (Arch == Triple::x86_64) {
if (RelType == ELF::R_X86_64_PLT32) {
} else if (Arch == Triple::x86_64 && RelType == ELF::R_X86_64_PLT32) {
// The way the PLT relocations normally work is that the linker allocates
// the
// PLT and this relocation makes a PC-relative call into the PLT. The PLT
@ -1312,7 +1337,7 @@ relocation_iterator RuntimeDyldELF::processRelocationRef(
Value.Offset);
addRelocationForSection(RE, Value.SectionID);
}
} else if (RelType == ELF::R_X86_64_GOTPCREL) {
} else if (Arch == Triple::x86_64 && RelType == ELF::R_X86_64_GOTPCREL) {
uint64_t GOTOffset = allocateGOTEntries(SectionID, 1);
resolveGOTOffsetRelocation(SectionID, Offset, GOTOffset + Addend);
@ -1322,20 +1347,12 @@ relocation_iterator RuntimeDyldELF::processRelocationRef(
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
} else if (RelType == ELF::R_X86_64_PC32) {
Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
processSimpleRelocation(SectionID, Offset, RelType, Value);
} else if (RelType == ELF::R_X86_64_PC64) {
Value.Addend += support::ulittle64_t::ref(computePlaceholderAddress(SectionID, Offset));
processSimpleRelocation(SectionID, Offset, RelType, Value);
} else {
processSimpleRelocation(SectionID, Offset, RelType, Value);
}
} else {
if (Arch == Triple::x86) {
Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
}
processSimpleRelocation(SectionID, Offset, RelType, Value);
RelocationEntry RE(SectionID, Offset, RelType, Value.Addend, Value.Offset);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
}
return ++RelI;
}

7
lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
View File

@ -99,13 +99,6 @@ class RuntimeDyldELF : public RuntimeDyldImpl {
uint64_t SymbolOffset,
unsigned Type);
// Compute the address in memory where we can find the placeholder
void *computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const;
// Split out common case for createing the RelocationEntry for when the relocation requires
// no particular advanced processing.
void processSimpleRelocation(unsigned SectionID, uint64_t Offset, unsigned RelType, RelocationValueRef Value);
// The tentative ID for the GOT section
unsigned GOTSectionID;