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//===-- CSKYAsmBackend.cpp - CSKY Assembler Backend -----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "CSKYAsmBackend.h"
#include "MCTargetDesc/CSKYMCTargetDesc.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "csky-asmbackend"
using namespace llvm;
std::unique_ptr<MCObjectTargetWriter>
CSKYAsmBackend::createObjectTargetWriter() const {
return createCSKYELFObjectWriter();
}
const MCFixupKindInfo &
CSKYAsmBackend::getFixupKindInfo(MCFixupKind Kind) const {
static llvm::DenseMap<unsigned, MCFixupKindInfo> Infos = {
{CSKY::Fixups::fixup_csky_addr32, {"fixup_csky_addr32", 0, 32, 0}},
{CSKY::Fixups::fixup_csky_addr_hi16, {"fixup_csky_addr_hi16", 0, 32, 0}},
{CSKY::Fixups::fixup_csky_addr_lo16, {"fixup_csky_addr_lo16", 0, 32, 0}},
{CSKY::Fixups::fixup_csky_pcrel_imm16_scale2,
{"fixup_csky_pcrel_imm16_scale2", 0, 32, MCFixupKindInfo::FKF_IsPCRel}},
{CSKY::Fixups::fixup_csky_pcrel_uimm16_scale4,
{"fixup_csky_pcrel_uimm16_scale4", 0, 32,
MCFixupKindInfo::FKF_IsPCRel |
MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}},
{CSKY::Fixups::fixup_csky_pcrel_uimm8_scale4,
{"fixup_csky_pcrel_uimm8_scale4", 0, 32,
MCFixupKindInfo::FKF_IsPCRel |
MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}},
{CSKY::Fixups::fixup_csky_pcrel_imm26_scale2,
{"fixup_csky_pcrel_imm26_scale2", 0, 32, MCFixupKindInfo::FKF_IsPCRel}},
{CSKY::Fixups::fixup_csky_pcrel_imm18_scale2,
{"fixup_csky_pcrel_imm18_scale2", 0, 32, MCFixupKindInfo::FKF_IsPCRel}},
{CSKY::Fixups::fixup_csky_got32, {"fixup_csky_got32", 0, 32, 0}},
{CSKY::Fixups::fixup_csky_got_imm18_scale4,
{"fixup_csky_got_imm18_scale4", 0, 32, 0}},
{CSKY::Fixups::fixup_csky_gotoff, {"fixup_csky_gotoff", 0, 32, 0}},
{CSKY::Fixups::fixup_csky_gotpc,
{"fixup_csky_gotpc", 0, 32, MCFixupKindInfo::FKF_IsPCRel}},
{CSKY::Fixups::fixup_csky_plt32, {"fixup_csky_plt32", 0, 32, 0}},
{CSKY::Fixups::fixup_csky_plt_imm18_scale4,
{"fixup_csky_plt_imm18_scale4", 0, 32, 0}},
{CSKY::Fixups::fixup_csky_pcrel_imm10_scale2,
{"fixup_csky_pcrel_imm10_scale2", 0, 16, MCFixupKindInfo::FKF_IsPCRel}},
{CSKY::Fixups::fixup_csky_pcrel_uimm7_scale4,
{"fixup_csky_pcrel_uimm7_scale4", 0, 16,
MCFixupKindInfo::FKF_IsPCRel |
MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}},
{CSKY::Fixups::fixup_csky_doffset_imm18,
{"fixup_csky_doffset_imm18", 0, 18, 0}},
{CSKY::Fixups::fixup_csky_doffset_imm18_scale2,
{"fixup_csky_doffset_imm18_scale2", 0, 18, 0}},
{CSKY::Fixups::fixup_csky_doffset_imm18_scale4,
{"fixup_csky_doffset_imm18_scale4", 0, 18, 0}}};
assert(Infos.size() == CSKY::NumTargetFixupKinds &&
"Not all fixup kinds added to Infos array");
if (FirstTargetFixupKind <= Kind && Kind < FirstLiteralRelocationKind) {
assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
"Invalid kind!");
return Infos[Kind];
} else if (Kind < FirstTargetFixupKind) {
return MCAsmBackend::getFixupKindInfo(Kind);
} else {
return MCAsmBackend::getFixupKindInfo(FK_NONE);
}
}
static uint64_t adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
MCContext &Ctx) {
switch (Fixup.getTargetKind()) {
default:
llvm_unreachable("Unknown fixup kind!");
case FK_Data_1:
case FK_Data_2:
case FK_Data_4:
case FK_Data_8:
return Value;
case CSKY::fixup_csky_addr32:
return Value & 0xffffffff;
case CSKY::fixup_csky_pcrel_imm16_scale2:
if (!isIntN(17, Value))
Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value.");
if (Value & 0x1)
Ctx.reportError(Fixup.getLoc(), "fixup value must be 2-byte aligned.");
return (Value >> 1) & 0xffff;
case CSKY::fixup_csky_pcrel_uimm16_scale4:
if (!isUIntN(18, Value))
Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value.");
if (Value & 0x3)
Ctx.reportError(Fixup.getLoc(), "fixup value must be 4-byte aligned.");
return (Value >> 2) & 0xffff;
case CSKY::fixup_csky_pcrel_imm26_scale2:
if (!isIntN(27, Value))
Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value.");
if (Value & 0x1)
Ctx.reportError(Fixup.getLoc(), "fixup value must be 2-byte aligned.");
return (Value >> 1) & 0x3ffffff;
case CSKY::fixup_csky_pcrel_imm18_scale2:
if (!isIntN(19, Value))
Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value.");
if (Value & 0x1)
Ctx.reportError(Fixup.getLoc(), "fixup value must be 2-byte aligned.");
return (Value >> 1) & 0x3ffff;
}
}
void CSKYAsmBackend::applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
const MCValue &Target,
MutableArrayRef<char> Data, uint64_t Value,
bool IsResolved,
const MCSubtargetInfo *STI) const {
MCFixupKind Kind = Fixup.getKind();
if (Kind >= FirstLiteralRelocationKind)
return;
MCContext &Ctx = Asm.getContext();
MCFixupKindInfo Info = getFixupKindInfo(Kind);
if (!Value)
return; // Doesn't change encoding.
// Apply any target-specific value adjustments.
Value = adjustFixupValue(Fixup, Value, Ctx);
// Shift the value into position.
Value <<= Info.TargetOffset;
unsigned Offset = Fixup.getOffset();
unsigned NumBytes = alignTo(Info.TargetSize + Info.TargetOffset, 8) / 8;
assert(Offset + NumBytes <= Data.size() && "Invalid fixup offset!");
// For each byte of the fragment that the fixup touches, mask in the
// bits from the fixup value.
bool IsLittleEndian = (Endian == support::little);
if (IsLittleEndian && (NumBytes == 4)) {
Data[Offset + 0] |= uint8_t((Value >> 16) & 0xff);
Data[Offset + 1] |= uint8_t((Value >> 24) & 0xff);
Data[Offset + 2] |= uint8_t(Value & 0xff);
Data[Offset + 3] |= uint8_t((Value >> 8) & 0xff);
} else {
for (unsigned I = 0; I != NumBytes; I++) {
unsigned Idx = IsLittleEndian ? I : (NumBytes - 1 - I);
Data[Offset + Idx] |= uint8_t((Value >> (I * 8)) & 0xff);
}
}
}
bool CSKYAsmBackend::fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
const MCRelaxableFragment *DF,
const MCAsmLayout &Layout) const {
return false;
}
void CSKYAsmBackend::relaxInstruction(MCInst &Inst,
const MCSubtargetInfo &STI) const {
llvm_unreachable("CSKYAsmBackend::relaxInstruction() unimplemented");
}
bool CSKYAsmBackend::writeNopData(raw_ostream &OS, uint64_t Count,
const MCSubtargetInfo *STI) const {
if (Count % 2)
return false;
// MOV32 r0, r0
while (Count >= 4) {
OS.write("\xc4\x00\x48\x20", 4);
Count -= 4;
}
// MOV16 r0, r0
if (Count)
OS.write("\x6c\x03", 2);
return true;
}
MCAsmBackend *llvm::createCSKYAsmBackend(const Target &T,
const MCSubtargetInfo &STI,
const MCRegisterInfo &MRI,
const MCTargetOptions &Options) {
return new CSKYAsmBackend(STI, Options);
}
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