mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-22 10:33:23 +00:00
224dbf4aec
I started trying to fix a small issue, but this code has seen a small fix too many. The old code was fairly convoluted. Some of the issues it had: * It failed to check if a symbol difference was in the some section when converting a relocation to pcrel. * It failed to check if the relocation was already pcrel. * The pcrel value computation was wrong in some cases (relocation-pc.s) * It was missing quiet a few cases where it should not convert symbol relocations to section relocations, leaving the backends to patch it up. * It would not propagate the fact that it had changed a relocation to pcrel, requiring a quiet nasty work around in ARM. * It was missing comments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205076 91177308-0d34-0410-b5e6-96231b3b80d8
116 lines
3.8 KiB
C++
116 lines
3.8 KiB
C++
//===-- SystemZMCObjectWriter.cpp - SystemZ ELF writer --------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "MCTargetDesc/SystemZMCTargetDesc.h"
|
|
#include "MCTargetDesc/SystemZMCFixups.h"
|
|
#include "llvm/MC/MCELFObjectWriter.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCValue.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
class SystemZObjectWriter : public MCELFObjectTargetWriter {
|
|
public:
|
|
SystemZObjectWriter(uint8_t OSABI);
|
|
|
|
virtual ~SystemZObjectWriter();
|
|
|
|
protected:
|
|
// Override MCELFObjectTargetWriter.
|
|
unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
|
|
bool IsPCRel) const override;
|
|
};
|
|
} // end anonymous namespace
|
|
|
|
SystemZObjectWriter::SystemZObjectWriter(uint8_t OSABI)
|
|
: MCELFObjectTargetWriter(/*Is64Bit=*/true, OSABI, ELF::EM_S390,
|
|
/*HasRelocationAddend=*/ true) {}
|
|
|
|
SystemZObjectWriter::~SystemZObjectWriter() {
|
|
}
|
|
|
|
// Return the relocation type for an absolute value of MCFixupKind Kind.
|
|
static unsigned getAbsoluteReloc(unsigned Kind) {
|
|
switch (Kind) {
|
|
case FK_Data_1: return ELF::R_390_8;
|
|
case FK_Data_2: return ELF::R_390_16;
|
|
case FK_Data_4: return ELF::R_390_32;
|
|
case FK_Data_8: return ELF::R_390_64;
|
|
}
|
|
llvm_unreachable("Unsupported absolute address");
|
|
}
|
|
|
|
// Return the relocation type for a PC-relative value of MCFixupKind Kind.
|
|
static unsigned getPCRelReloc(unsigned Kind) {
|
|
switch (Kind) {
|
|
case FK_Data_2: return ELF::R_390_PC16;
|
|
case FK_Data_4: return ELF::R_390_PC32;
|
|
case FK_Data_8: return ELF::R_390_PC64;
|
|
case SystemZ::FK_390_PC16DBL: return ELF::R_390_PC16DBL;
|
|
case SystemZ::FK_390_PC32DBL: return ELF::R_390_PC32DBL;
|
|
case SystemZ::FK_390_PLT16DBL: return ELF::R_390_PLT16DBL;
|
|
case SystemZ::FK_390_PLT32DBL: return ELF::R_390_PLT32DBL;
|
|
}
|
|
llvm_unreachable("Unsupported PC-relative address");
|
|
}
|
|
|
|
// Return the R_390_TLS_LE* relocation type for MCFixupKind Kind.
|
|
static unsigned getTLSLEReloc(unsigned Kind) {
|
|
switch (Kind) {
|
|
case FK_Data_4: return ELF::R_390_TLS_LE32;
|
|
case FK_Data_8: return ELF::R_390_TLS_LE64;
|
|
}
|
|
llvm_unreachable("Unsupported absolute address");
|
|
}
|
|
|
|
// Return the PLT relocation counterpart of MCFixupKind Kind.
|
|
static unsigned getPLTReloc(unsigned Kind) {
|
|
switch (Kind) {
|
|
case SystemZ::FK_390_PC16DBL: return ELF::R_390_PLT16DBL;
|
|
case SystemZ::FK_390_PC32DBL: return ELF::R_390_PLT32DBL;
|
|
}
|
|
llvm_unreachable("Unsupported absolute address");
|
|
}
|
|
|
|
unsigned SystemZObjectWriter::GetRelocType(const MCValue &Target,
|
|
const MCFixup &Fixup,
|
|
bool IsPCRel) const {
|
|
MCSymbolRefExpr::VariantKind Modifier = Fixup.getAccessVariant();
|
|
unsigned Kind = Fixup.getKind();
|
|
switch (Modifier) {
|
|
case MCSymbolRefExpr::VK_None:
|
|
if (IsPCRel)
|
|
return getPCRelReloc(Kind);
|
|
return getAbsoluteReloc(Kind);
|
|
|
|
case MCSymbolRefExpr::VK_NTPOFF:
|
|
assert(!IsPCRel && "NTPOFF shouldn't be PC-relative");
|
|
return getTLSLEReloc(Kind);
|
|
|
|
case MCSymbolRefExpr::VK_GOT:
|
|
if (IsPCRel && Kind == SystemZ::FK_390_PC32DBL)
|
|
return ELF::R_390_GOTENT;
|
|
llvm_unreachable("Only PC-relative GOT accesses are supported for now");
|
|
|
|
case MCSymbolRefExpr::VK_PLT:
|
|
assert(IsPCRel && "@PLT shouldt be PC-relative");
|
|
return getPLTReloc(Kind);
|
|
|
|
default:
|
|
llvm_unreachable("Modifier not supported");
|
|
}
|
|
}
|
|
|
|
MCObjectWriter *llvm::createSystemZObjectWriter(raw_ostream &OS,
|
|
uint8_t OSABI) {
|
|
MCELFObjectTargetWriter *MOTW = new SystemZObjectWriter(OSABI);
|
|
return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);
|
|
}
|