776d50d371
Make sure that the upper bits of the offset is placed in bits 20-21 of the instruction word. This fixes the encoding of backwards (negative offset) BPr branches. (Previously, the upper two bits of the offset would overwrite parts of the rs1 field, causing it to branch on the wrong register, with the wrong offset) Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D144012
152 lines
6.8 KiB
C++
152 lines
6.8 KiB
C++
//===-- SparcELFObjectWriter.cpp - Sparc ELF Writer -----------------------===//
|
|
//
|
|
// 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/SparcFixupKinds.h"
|
|
#include "MCTargetDesc/SparcMCExpr.h"
|
|
#include "MCTargetDesc/SparcMCTargetDesc.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/MC/MCELFObjectWriter.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCObjectWriter.h"
|
|
#include "llvm/MC/MCValue.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
class SparcELFObjectWriter : public MCELFObjectTargetWriter {
|
|
public:
|
|
SparcELFObjectWriter(bool Is64Bit, uint8_t OSABI)
|
|
: MCELFObjectTargetWriter(Is64Bit, OSABI,
|
|
Is64Bit ? ELF::EM_SPARCV9 : ELF::EM_SPARC,
|
|
/*HasRelocationAddend*/ true) {}
|
|
|
|
~SparcELFObjectWriter() override = default;
|
|
|
|
protected:
|
|
unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
|
|
const MCFixup &Fixup, bool IsPCRel) const override;
|
|
|
|
bool needsRelocateWithSymbol(const MCSymbol &Sym,
|
|
unsigned Type) const override;
|
|
|
|
};
|
|
}
|
|
|
|
unsigned SparcELFObjectWriter::getRelocType(MCContext &Ctx,
|
|
const MCValue &Target,
|
|
const MCFixup &Fixup,
|
|
bool IsPCRel) const {
|
|
MCFixupKind Kind = Fixup.getKind();
|
|
if (Kind >= FirstLiteralRelocationKind)
|
|
return Kind - FirstLiteralRelocationKind;
|
|
|
|
if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Fixup.getValue())) {
|
|
if (SExpr->getKind() == SparcMCExpr::VK_Sparc_R_DISP32)
|
|
return ELF::R_SPARC_DISP32;
|
|
}
|
|
|
|
if (IsPCRel) {
|
|
switch(Fixup.getTargetKind()) {
|
|
default:
|
|
llvm_unreachable("Unimplemented fixup -> relocation");
|
|
case FK_Data_1: return ELF::R_SPARC_DISP8;
|
|
case FK_Data_2: return ELF::R_SPARC_DISP16;
|
|
case FK_Data_4: return ELF::R_SPARC_DISP32;
|
|
case FK_Data_8: return ELF::R_SPARC_DISP64;
|
|
case Sparc::fixup_sparc_call30: return ELF::R_SPARC_WDISP30;
|
|
case Sparc::fixup_sparc_br22: return ELF::R_SPARC_WDISP22;
|
|
case Sparc::fixup_sparc_br19: return ELF::R_SPARC_WDISP19;
|
|
case Sparc::fixup_sparc_br16:
|
|
return ELF::R_SPARC_WDISP16;
|
|
case Sparc::fixup_sparc_pc22: return ELF::R_SPARC_PC22;
|
|
case Sparc::fixup_sparc_pc10: return ELF::R_SPARC_PC10;
|
|
case Sparc::fixup_sparc_wplt30: return ELF::R_SPARC_WPLT30;
|
|
}
|
|
}
|
|
|
|
switch(Fixup.getTargetKind()) {
|
|
default:
|
|
llvm_unreachable("Unimplemented fixup -> relocation");
|
|
case FK_NONE: return ELF::R_SPARC_NONE;
|
|
case FK_Data_1: return ELF::R_SPARC_8;
|
|
case FK_Data_2: return ((Fixup.getOffset() % 2)
|
|
? ELF::R_SPARC_UA16
|
|
: ELF::R_SPARC_16);
|
|
case FK_Data_4: return ((Fixup.getOffset() % 4)
|
|
? ELF::R_SPARC_UA32
|
|
: ELF::R_SPARC_32);
|
|
case FK_Data_8: return ((Fixup.getOffset() % 8)
|
|
? ELF::R_SPARC_UA64
|
|
: ELF::R_SPARC_64);
|
|
case Sparc::fixup_sparc_13: return ELF::R_SPARC_13;
|
|
case Sparc::fixup_sparc_hi22: return ELF::R_SPARC_HI22;
|
|
case Sparc::fixup_sparc_lo10: return ELF::R_SPARC_LO10;
|
|
case Sparc::fixup_sparc_h44: return ELF::R_SPARC_H44;
|
|
case Sparc::fixup_sparc_m44: return ELF::R_SPARC_M44;
|
|
case Sparc::fixup_sparc_l44: return ELF::R_SPARC_L44;
|
|
case Sparc::fixup_sparc_hh: return ELF::R_SPARC_HH22;
|
|
case Sparc::fixup_sparc_hm: return ELF::R_SPARC_HM10;
|
|
case Sparc::fixup_sparc_lm: return ELF::R_SPARC_LM22;
|
|
case Sparc::fixup_sparc_got22: return ELF::R_SPARC_GOT22;
|
|
case Sparc::fixup_sparc_got10: return ELF::R_SPARC_GOT10;
|
|
case Sparc::fixup_sparc_got13: return ELF::R_SPARC_GOT13;
|
|
case Sparc::fixup_sparc_tls_gd_hi22: return ELF::R_SPARC_TLS_GD_HI22;
|
|
case Sparc::fixup_sparc_tls_gd_lo10: return ELF::R_SPARC_TLS_GD_LO10;
|
|
case Sparc::fixup_sparc_tls_gd_add: return ELF::R_SPARC_TLS_GD_ADD;
|
|
case Sparc::fixup_sparc_tls_gd_call: return ELF::R_SPARC_TLS_GD_CALL;
|
|
case Sparc::fixup_sparc_tls_ldm_hi22: return ELF::R_SPARC_TLS_LDM_HI22;
|
|
case Sparc::fixup_sparc_tls_ldm_lo10: return ELF::R_SPARC_TLS_LDM_LO10;
|
|
case Sparc::fixup_sparc_tls_ldm_add: return ELF::R_SPARC_TLS_LDM_ADD;
|
|
case Sparc::fixup_sparc_tls_ldm_call: return ELF::R_SPARC_TLS_LDM_CALL;
|
|
case Sparc::fixup_sparc_tls_ldo_hix22: return ELF::R_SPARC_TLS_LDO_HIX22;
|
|
case Sparc::fixup_sparc_tls_ldo_lox10: return ELF::R_SPARC_TLS_LDO_LOX10;
|
|
case Sparc::fixup_sparc_tls_ldo_add: return ELF::R_SPARC_TLS_LDO_ADD;
|
|
case Sparc::fixup_sparc_tls_ie_hi22: return ELF::R_SPARC_TLS_IE_HI22;
|
|
case Sparc::fixup_sparc_tls_ie_lo10: return ELF::R_SPARC_TLS_IE_LO10;
|
|
case Sparc::fixup_sparc_tls_ie_ld: return ELF::R_SPARC_TLS_IE_LD;
|
|
case Sparc::fixup_sparc_tls_ie_ldx: return ELF::R_SPARC_TLS_IE_LDX;
|
|
case Sparc::fixup_sparc_tls_ie_add: return ELF::R_SPARC_TLS_IE_ADD;
|
|
case Sparc::fixup_sparc_tls_le_hix22: return ELF::R_SPARC_TLS_LE_HIX22;
|
|
case Sparc::fixup_sparc_tls_le_lox10: return ELF::R_SPARC_TLS_LE_LOX10;
|
|
case Sparc::fixup_sparc_hix22: return ELF::R_SPARC_HIX22;
|
|
case Sparc::fixup_sparc_lox10: return ELF::R_SPARC_LOX10;
|
|
case Sparc::fixup_sparc_gotdata_hix22: return ELF::R_SPARC_GOTDATA_HIX22;
|
|
case Sparc::fixup_sparc_gotdata_lox10: return ELF::R_SPARC_GOTDATA_LOX10;
|
|
case Sparc::fixup_sparc_gotdata_op: return ELF::R_SPARC_GOTDATA_OP;
|
|
}
|
|
|
|
return ELF::R_SPARC_NONE;
|
|
}
|
|
|
|
bool SparcELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
|
|
unsigned Type) const {
|
|
switch (Type) {
|
|
default:
|
|
return false;
|
|
|
|
// All relocations that use a GOT need a symbol, not an offset, as
|
|
// the offset of the symbol within the section is irrelevant to
|
|
// where the GOT entry is. Don't need to list all the TLS entries,
|
|
// as they're all marked as requiring a symbol anyways.
|
|
case ELF::R_SPARC_GOT10:
|
|
case ELF::R_SPARC_GOT13:
|
|
case ELF::R_SPARC_GOT22:
|
|
case ELF::R_SPARC_GOTDATA_HIX22:
|
|
case ELF::R_SPARC_GOTDATA_LOX10:
|
|
case ELF::R_SPARC_GOTDATA_OP_HIX22:
|
|
case ELF::R_SPARC_GOTDATA_OP_LOX10:
|
|
return true;
|
|
}
|
|
}
|
|
|
|
std::unique_ptr<MCObjectTargetWriter>
|
|
llvm::createSparcELFObjectWriter(bool Is64Bit, uint8_t OSABI) {
|
|
return std::make_unique<SparcELFObjectWriter>(Is64Bit, OSABI);
|
|
}
|