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|
//===- lib/ReaderWriter/ELF/AArch64/AArch64RelocationHandler.cpp ----------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "AArch64TargetHandler.h"
#include "AArch64LinkingContext.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/MathExtras.h"
using namespace lld;
using namespace lld::elf;
using namespace llvm::support::endian;
#define PAGE(X) ((X) & ~0x0FFFL)
/// \brief Check X is in the interval (-2^(bits-1), 2^bits]
static bool withinSignedUnsignedRange(int64_t X, int bits) {
return isIntN(bits - 1, X) || isUIntN(bits, X);
}
/// \brief R_AARCH64_ABS64 - word64: S + A
static void relocR_AARCH64_ABS64(uint8_t *location, uint64_t P, uint64_t S,
int64_t A) {
int64_t result = (int64_t)S + A;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: 0x" << Twine::utohexstr(S);
llvm::dbgs() << " A: 0x" << Twine::utohexstr(A);
llvm::dbgs() << " P: 0x" << Twine::utohexstr(P);
llvm::dbgs() << " result: 0x" << Twine::utohexstr(result) << "\n");
write64le(location, result | read64le(location));
}
/// \brief R_AARCH64_PREL32 - word32: S + A - P
static void relocR_AARCH64_PREL32(uint8_t *location, uint64_t P, uint64_t S,
int64_t A) {
int32_t result = (int32_t)((S + A) - P);
write32le(location, result + (int32_t)read32le(location));
}
/// \brief R_AARCH64_ABS32 - word32: S + A
static std::error_code relocR_AARCH64_ABS32(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
int64_t result = S + A;
if (!withinSignedUnsignedRange(result, 32))
return make_out_of_range_reloc_error();
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: 0x" << Twine::utohexstr(S);
llvm::dbgs() << " A: 0x" << Twine::utohexstr(A);
llvm::dbgs() << " P: 0x" << Twine::utohexstr(P);
llvm::dbgs() << " result: 0x" << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
return std::error_code();
}
/// \brief R_AARCH64_ADR_PREL_PG_HI21 - Page(S+A) - Page(P)
static void relocR_AARCH64_ADR_PREL_PG_HI21(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
uint64_t result = (PAGE(S + A) - PAGE(P));
result = result >> 12;
uint32_t immlo = result & 0x3;
uint32_t immhi = result & 0x1FFFFC;
immlo = immlo << 29;
immhi = immhi << 3;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " immhi: " << Twine::utohexstr(immhi);
llvm::dbgs() << " immlo: " << Twine::utohexstr(immlo);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, immlo | immhi | read32le(location));
// TODO: Make sure this is correct!
}
/// \brief R_AARCH64_ADR_PREL_LO21 - S + A - P
static void relocR_AARCH64_ADR_PREL_LO21(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
uint64_t result = (S + A) - P;
uint32_t immlo = result & 0x3;
uint32_t immhi = result & 0x1FFFFC;
immlo = immlo << 29;
immhi = immhi << 3;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " immhi: " << Twine::utohexstr(immhi);
llvm::dbgs() << " immlo: " << Twine::utohexstr(immlo);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, immlo | immhi | read32le(location));
// TODO: Make sure this is correct!
}
/// \brief R_AARCH64_ADD_ABS_LO12_NC
static void relocR_AARCH64_ADD_ABS_LO12_NC(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
int32_t result = (int32_t)((S + A) & 0xFFF);
result <<= 10;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
static void relocJump26(uint8_t *location, uint64_t P, uint64_t S, int64_t A) {
int32_t result = (int32_t)((S + A) - P);
result &= 0x0FFFFFFC;
result >>= 2;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
/// \brief R_AARCH64_CONDBR19
static void relocR_AARCH64_CONDBR19(uint8_t *location, uint64_t P, uint64_t S,
int64_t A) {
int32_t result = (int32_t)((S + A) - P);
result &= 0x01FFFFC;
result <<= 3;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
/// \brief R_AARCH64_LDST8_ABS_LO12_NC - S + A
static void relocR_AARCH64_LDST8_ABS_LO12_NC(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
int32_t result = (int32_t)((S + A) & 0xFFF);
result <<= 10;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
/// \brief R_AARCH64_LDST16_ABS_LO12_NC
static void relocR_AARCH64_LDST16_ABS_LO12_NC(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
int32_t result = (int32_t)(S + A);
result &= 0x0FFC;
result <<= 9;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
/// \brief R_AARCH64_LDST32_ABS_LO12_NC
static void relocR_AARCH64_LDST32_ABS_LO12_NC(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
int32_t result = (int32_t)(S + A);
result &= 0x0FFC;
result <<= 8;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
/// \brief R_AARCH64_LDST64_ABS_LO12_NC
static void relocR_AARCH64_LDST64_ABS_LO12_NC(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
int32_t result = (int32_t)(S + A);
result &= 0x0FF8;
result <<= 7;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
/// \brief R_AARCH64_LDST128_ABS_LO12_NC
static void relocR_AARCH64_LDST128_ABS_LO12_NC(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
int32_t result = (int32_t)(S + A);
result &= 0x0FF8;
result <<= 6;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
static void relocR_AARCH64_ADR_GOT_PAGE(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
uint64_t result = PAGE(S + A) - PAGE(P);
result >>= 12;
uint32_t immlo = result & 0x3;
uint32_t immhi = result & 0x1FFFFC;
immlo = immlo << 29;
immhi = immhi << 3;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " immhi: " << Twine::utohexstr(immhi);
llvm::dbgs() << " immlo: " << Twine::utohexstr(immlo);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
// R_AARCH64_LD64_GOT_LO12_NC
static void relocR_AARCH64_LD64_GOT_LO12_NC(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
int32_t result = S + A;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
result &= 0xFF8;
result <<= 7;
write32le(location, result | read32le(location));
}
// ADD_AARCH64_GOTRELINDEX
static void relocADD_AARCH64_GOTRELINDEX(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
int32_t result = S + A;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
result &= 0xFFF;
result <<= 10;
write32le(location, result | read32le(location));
}
// R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
static void relocR_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21(uint8_t *location,
uint64_t P, uint64_t S,
int64_t A) {
int64_t result = PAGE(S + A) - PAGE(P);
result >>= 12;
uint32_t immlo = result & 0x3;
uint32_t immhi = result & 0x1FFFFC;
immlo = immlo << 29;
immhi = immhi << 3;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " immhi: " << Twine::utohexstr(immhi);
llvm::dbgs() << " immlo: " << Twine::utohexstr(immlo);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, immlo | immhi | read32le(location));
}
// R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
static void relocR_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC(uint8_t *location,
uint64_t P, uint64_t S,
int64_t A) {
int32_t result = S + A;
result &= 0xFF8;
result <<= 7;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
/// \brief R_AARCH64_TLSLE_ADD_TPREL_HI12
static void relocR_AARCH64_TLSLE_ADD_TPREL_HI12(uint8_t *location, uint64_t P,
uint64_t S, int64_t A) {
int32_t result = S + A;
result &= 0x0FFF000;
result >>= 2;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
/// \brief R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
static void relocR_AARCH64_TLSLE_ADD_TPREL_LO12_NC(uint8_t *location,
uint64_t P, uint64_t S,
int64_t A) {
int32_t result = S + A;
result &= 0x0FFF;
result <<= 10;
DEBUG_WITH_TYPE(
"AArch64", llvm::dbgs() << "\t\tHandle " << LLVM_FUNCTION_NAME << " -";
llvm::dbgs() << " S: " << Twine::utohexstr(S);
llvm::dbgs() << " A: " << Twine::utohexstr(A);
llvm::dbgs() << " P: " << Twine::utohexstr(P);
llvm::dbgs() << " result: " << Twine::utohexstr(result) << "\n");
write32le(location, result | read32le(location));
}
std::error_code AArch64TargetRelocationHandler::applyRelocation(
ELFWriter &writer, llvm::FileOutputBuffer &buf, const lld::AtomLayout &atom,
const Reference &ref) const {
uint8_t *atomContent = buf.getBufferStart() + atom._fileOffset;
uint8_t *location = atomContent + ref.offsetInAtom();
uint64_t targetVAddress = writer.addressOfAtom(ref.target());
uint64_t relocVAddress = atom._virtualAddr + ref.offsetInAtom();
if (ref.kindNamespace() != Reference::KindNamespace::ELF)
return std::error_code();
assert(ref.kindArch() == Reference::KindArch::AArch64);
switch (ref.kindValue()) {
case R_AARCH64_NONE:
break;
case R_AARCH64_ABS64:
relocR_AARCH64_ABS64(location, relocVAddress, targetVAddress, ref.addend());
break;
case R_AARCH64_PREL32:
relocR_AARCH64_PREL32(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_ABS32:
return relocR_AARCH64_ABS32(location, relocVAddress, targetVAddress,
ref.addend());
// Runtime only relocations. Ignore here.
case R_AARCH64_RELATIVE:
case R_AARCH64_IRELATIVE:
case R_AARCH64_JUMP_SLOT:
case R_AARCH64_GLOB_DAT:
break;
case R_AARCH64_ADR_PREL_PG_HI21:
relocR_AARCH64_ADR_PREL_PG_HI21(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_ADR_PREL_LO21:
relocR_AARCH64_ADR_PREL_LO21(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_ADD_ABS_LO12_NC:
relocR_AARCH64_ADD_ABS_LO12_NC(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_CALL26:
case R_AARCH64_JUMP26:
relocJump26(location, relocVAddress, targetVAddress, ref.addend());
break;
case R_AARCH64_CONDBR19:
relocR_AARCH64_CONDBR19(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_ADR_GOT_PAGE:
relocR_AARCH64_ADR_GOT_PAGE(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_LD64_GOT_LO12_NC:
relocR_AARCH64_LD64_GOT_LO12_NC(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_LDST8_ABS_LO12_NC:
relocR_AARCH64_LDST8_ABS_LO12_NC(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_LDST16_ABS_LO12_NC:
relocR_AARCH64_LDST16_ABS_LO12_NC(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_LDST32_ABS_LO12_NC:
relocR_AARCH64_LDST32_ABS_LO12_NC(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_LDST64_ABS_LO12_NC:
relocR_AARCH64_LDST64_ABS_LO12_NC(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_LDST128_ABS_LO12_NC:
relocR_AARCH64_LDST128_ABS_LO12_NC(location, relocVAddress, targetVAddress,
ref.addend());
break;
case ADD_AARCH64_GOTRELINDEX:
relocADD_AARCH64_GOTRELINDEX(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
relocR_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21(location, relocVAddress,
targetVAddress, ref.addend());
break;
case R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
relocR_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC(location, relocVAddress,
targetVAddress, ref.addend());
break;
case R_AARCH64_TLSLE_ADD_TPREL_HI12:
relocR_AARCH64_TLSLE_ADD_TPREL_HI12(location, relocVAddress, targetVAddress,
ref.addend());
break;
case R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
relocR_AARCH64_TLSLE_ADD_TPREL_LO12_NC(location, relocVAddress,
targetVAddress, ref.addend());
break;
default:
return make_unhandled_reloc_error();
}
return std::error_code();
}
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