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//===-- VEAsmBackend.cpp - VE 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 "MCTargetDesc/VEFixupKinds.h"
#include "MCTargetDesc/VEMCTargetDesc.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCValue.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/EndianStream.h"
using namespace llvm;
static uint64_t adjustFixupValue(unsigned Kind, uint64_t Value) {
switch (Kind) {
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 VE::fixup_ve_hi32:
case VE::fixup_ve_pc_hi32:
case VE::fixup_ve_got_hi32:
case VE::fixup_ve_gotoff_hi32:
case VE::fixup_ve_plt_hi32:
case VE::fixup_ve_tls_gd_hi32:
case VE::fixup_ve_tpoff_hi32:
return (Value >> 32) & 0xffffffff;
case VE::fixup_ve_reflong:
case VE::fixup_ve_srel32:
case VE::fixup_ve_lo32:
case VE::fixup_ve_pc_lo32:
case VE::fixup_ve_got_lo32:
case VE::fixup_ve_gotoff_lo32:
case VE::fixup_ve_plt_lo32:
case VE::fixup_ve_tls_gd_lo32:
case VE::fixup_ve_tpoff_lo32:
return Value & 0xffffffff;
}
}
/// getFixupKindNumBytes - The number of bytes the fixup may change.
static unsigned getFixupKindNumBytes(unsigned Kind) {
switch (Kind) {
default:
llvm_unreachable("Unknown fixup kind!");
case FK_Data_1:
return 1;
case FK_Data_2:
return 2;
case FK_Data_4:
case VE::fixup_ve_reflong:
case VE::fixup_ve_srel32:
case VE::fixup_ve_hi32:
case VE::fixup_ve_lo32:
case VE::fixup_ve_pc_hi32:
case VE::fixup_ve_pc_lo32:
case VE::fixup_ve_got_hi32:
case VE::fixup_ve_got_lo32:
case VE::fixup_ve_gotoff_hi32:
case VE::fixup_ve_gotoff_lo32:
case VE::fixup_ve_plt_hi32:
case VE::fixup_ve_plt_lo32:
case VE::fixup_ve_tls_gd_hi32:
case VE::fixup_ve_tls_gd_lo32:
case VE::fixup_ve_tpoff_hi32:
case VE::fixup_ve_tpoff_lo32:
return 4;
case FK_Data_8:
return 8;
}
}
namespace {
class VEAsmBackend : public MCAsmBackend {
protected:
const Target &TheTarget;
public:
VEAsmBackend(const Target &T)
: MCAsmBackend(llvm::endianness::little), TheTarget(T) {}
MCFixupKindInfo getFixupKindInfo(MCFixupKind Kind) const override {
const static MCFixupKindInfo Infos[VE::NumTargetFixupKinds] = {
// name, offset, bits, flags
{"fixup_ve_reflong", 0, 32, 0}, {"fixup_ve_srel32", 0, 32, 0},
{"fixup_ve_hi32", 0, 32, 0}, {"fixup_ve_lo32", 0, 32, 0},
{"fixup_ve_pc_hi32", 0, 32, 0}, {"fixup_ve_pc_lo32", 0, 32, 0},
{"fixup_ve_got_hi32", 0, 32, 0}, {"fixup_ve_got_lo32", 0, 32, 0},
{"fixup_ve_gotoff_hi32", 0, 32, 0}, {"fixup_ve_gotoff_lo32", 0, 32, 0},
{"fixup_ve_plt_hi32", 0, 32, 0}, {"fixup_ve_plt_lo32", 0, 32, 0},
{"fixup_ve_tls_gd_hi32", 0, 32, 0}, {"fixup_ve_tls_gd_lo32", 0, 32, 0},
{"fixup_ve_tpoff_hi32", 0, 32, 0}, {"fixup_ve_tpoff_lo32", 0, 32, 0},
};
if (Kind < FirstTargetFixupKind)
return MCAsmBackend::getFixupKindInfo(Kind);
assert(unsigned(Kind - FirstTargetFixupKind) < VE::NumTargetFixupKinds &&
"Invalid kind!");
return Infos[Kind - FirstTargetFixupKind];
}
void applyFixup(const MCFragment &, const MCFixup &, const MCValue &,
uint8_t *, uint64_t Value, bool IsResolved) override;
bool mayNeedRelaxation(unsigned Opcode, ArrayRef<MCOperand> Operands,
const MCSubtargetInfo &STI) const override {
// Not implemented yet. For example, if we have a branch with
// lager than SIMM32 immediate value, we want to relaxation such
// branch instructions.
return false;
}
bool writeNopData(raw_ostream &OS, uint64_t Count,
const MCSubtargetInfo *STI) const override {
if ((Count % 8) != 0)
return false;
for (uint64_t i = 0; i < Count; i += 8)
support::endian::write<uint64_t>(OS, 0x7900000000000000ULL,
llvm::endianness::little);
return true;
}
};
class ELFVEAsmBackend : public VEAsmBackend {
Triple::OSType OSType;
public:
ELFVEAsmBackend(const Target &T, Triple::OSType OSType)
: VEAsmBackend(T), OSType(OSType) {}
std::unique_ptr<MCObjectTargetWriter>
createObjectTargetWriter() const override {
uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(OSType);
return createVEELFObjectWriter(OSABI);
}
};
} // end anonymous namespace
void VEAsmBackend::applyFixup(const MCFragment &F, const MCFixup &Fixup,
const MCValue &Target, uint8_t *Data,
uint64_t Value, bool IsResolved) {
switch (Fixup.getKind()) {
case VE::fixup_ve_tls_gd_hi32:
case VE::fixup_ve_tls_gd_lo32:
case VE::fixup_ve_tpoff_hi32:
case VE::fixup_ve_tpoff_lo32:
IsResolved = false;
break;
}
maybeAddReloc(F, Fixup, Target, Value, IsResolved);
Value = adjustFixupValue(Fixup.getKind(), Value);
if (!Value)
return; // Doesn't change encoding.
MCFixupKindInfo Info = getFixupKindInfo(Fixup.getKind());
// Shift the value into position.
Value <<= Info.TargetOffset;
unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
assert(Fixup.getOffset() + NumBytes <= F.getSize() &&
"Invalid fixup offset!");
// For each byte of the fragment that the fixup touches, mask in the bits
// from the fixup value. The Value has been "split up" into the
// appropriate bitfields above.
for (unsigned i = 0; i != NumBytes; ++i) {
unsigned Idx = Endian == llvm::endianness::little ? i : (NumBytes - 1) - i;
Data[Idx] |= static_cast<uint8_t>((Value >> (i * 8)) & 0xff);
}
}
MCAsmBackend *llvm::createVEAsmBackend(const Target &T,
const MCSubtargetInfo &STI,
const MCRegisterInfo &MRI,
const MCTargetOptions &Options) {
return new ELFVEAsmBackend(T, STI.getTargetTriple().getOS());
}
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