lib/Target/AArch64/MCTargetDesc/AArch64ELFObjectWriter.cpp

   1 //===-- AArch64ELFObjectWriter.cpp - AArch64 ELF Writer -------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file handles ELF-specific object emission, converting LLVM's internal
  11 // fixups into the appropriate relocations.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "MCTargetDesc/AArch64FixupKinds.h"
  16 #include "MCTargetDesc/AArch64MCTargetDesc.h"
  17 #include "llvm/MC/MCELFObjectWriter.h"
  18 #include "llvm/MC/MCValue.h"
  19 #include "llvm/Support/ErrorHandling.h"
  20
  21 using namespace llvm;
  22
  23 namespace {
  24 class AArch64ELFObjectWriter : public MCELFObjectTargetWriter {
  25 public:
  26   AArch64ELFObjectWriter(uint8_t OSABI, bool IsLittleEndian);
  27
  28   virtual ~AArch64ELFObjectWriter();
  29
  30 protected:
  31   unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
  32                         bool IsPCRel) const override;
  33
  34 private:
  35 };
  36 }
  37
  38 AArch64ELFObjectWriter::AArch64ELFObjectWriter(uint8_t OSABI, bool IsLittleEndian)
  39   : MCELFObjectTargetWriter(/*Is64Bit*/ true, OSABI, ELF::EM_AARCH64,
  40                             /*HasRelocationAddend*/ true)
  41 {}
  42
  43 AArch64ELFObjectWriter::~AArch64ELFObjectWriter()
  44 {}
  45
  46 unsigned AArch64ELFObjectWriter::GetRelocType(const MCValue &Target,
  47                                               const MCFixup &Fixup,
  48                                               bool IsPCRel) const {
  49   unsigned Type;
  50   if (IsPCRel) {
  51     switch ((unsigned)Fixup.getKind()) {
  52     default:
  53       llvm_unreachable("Unimplemented fixup -> relocation");
  54     case FK_Data_8:
  55       return ELF::R_AARCH64_PREL64;
  56     case FK_Data_4:
  57       return ELF::R_AARCH64_PREL32;
  58     case FK_Data_2:
  59       return ELF::R_AARCH64_PREL16;
  60     case AArch64::fixup_a64_ld_prel:
  61       Type = ELF::R_AARCH64_LD_PREL_LO19;
  62       break;
  63     case AArch64::fixup_a64_adr_prel:
  64       Type = ELF::R_AARCH64_ADR_PREL_LO21;
  65       break;
  66     case AArch64::fixup_a64_adr_prel_page:
  67       Type = ELF::R_AARCH64_ADR_PREL_PG_HI21;
  68       break;
  69     case AArch64::fixup_a64_adr_prel_got_page:
  70       Type = ELF::R_AARCH64_ADR_GOT_PAGE;
  71       break;
  72     case AArch64::fixup_a64_tstbr:
  73       Type = ELF::R_AARCH64_TSTBR14;
  74       break;
  75     case AArch64::fixup_a64_condbr:
  76       Type = ELF::R_AARCH64_CONDBR19;
  77       break;
  78     case AArch64::fixup_a64_uncondbr:
  79       Type = ELF::R_AARCH64_JUMP26;
  80       break;
  81     case AArch64::fixup_a64_call:
  82       Type = ELF::R_AARCH64_CALL26;
  83       break;
  84     case AArch64::fixup_a64_adr_gottprel_page:
  85       Type = ELF::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21;
  86       break;
  87     case AArch64::fixup_a64_ld_gottprel_prel19:
  88       Type =  ELF::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19;
  89       break;
  90     case AArch64::fixup_a64_tlsdesc_adr_page:
  91       Type = ELF::R_AARCH64_TLSDESC_ADR_PAGE;
  92       break;
  93     }
  94   } else {
  95     switch ((unsigned)Fixup.getKind()) {
  96     default:
  97       llvm_unreachable("Unimplemented fixup -> relocation");
  98     case FK_Data_8:
  99       return ELF::R_AARCH64_ABS64;
 100     case FK_Data_4:
 101       return ELF::R_AARCH64_ABS32;
 102     case FK_Data_2:
 103       return ELF::R_AARCH64_ABS16;
 104     case AArch64::fixup_a64_add_lo12:
 105       Type = ELF::R_AARCH64_ADD_ABS_LO12_NC;
 106       break;
 107     case AArch64::fixup_a64_ld64_got_lo12_nc:
 108       Type = ELF::R_AARCH64_LD64_GOT_LO12_NC;
 109       break;
 110     case AArch64::fixup_a64_ldst8_lo12:
 111       Type = ELF::R_AARCH64_LDST8_ABS_LO12_NC;
 112       break;
 113     case AArch64::fixup_a64_ldst16_lo12:
 114       Type = ELF::R_AARCH64_LDST16_ABS_LO12_NC;
 115       break;
 116     case AArch64::fixup_a64_ldst32_lo12:
 117       Type = ELF::R_AARCH64_LDST32_ABS_LO12_NC;
 118       break;
 119     case AArch64::fixup_a64_ldst64_lo12:
 120       Type = ELF::R_AARCH64_LDST64_ABS_LO12_NC;
 121       break;
 122     case AArch64::fixup_a64_ldst128_lo12:
 123       Type = ELF::R_AARCH64_LDST128_ABS_LO12_NC;
 124       break;
 125     case AArch64::fixup_a64_movw_uabs_g0:
 126       Type = ELF::R_AARCH64_MOVW_UABS_G0;
 127       break;
 128     case AArch64::fixup_a64_movw_uabs_g0_nc:
 129       Type = ELF::R_AARCH64_MOVW_UABS_G0_NC;
 130       break;
 131     case AArch64::fixup_a64_movw_uabs_g1:
 132       Type = ELF::R_AARCH64_MOVW_UABS_G1;
 133       break;
 134     case AArch64::fixup_a64_movw_uabs_g1_nc:
 135       Type = ELF::R_AARCH64_MOVW_UABS_G1_NC;
 136       break;
 137     case AArch64::fixup_a64_movw_uabs_g2:
 138       Type = ELF::R_AARCH64_MOVW_UABS_G2;
 139       break;
 140     case AArch64::fixup_a64_movw_uabs_g2_nc:
 141       Type = ELF::R_AARCH64_MOVW_UABS_G2_NC;
 142       break;
 143     case AArch64::fixup_a64_movw_uabs_g3:
 144       Type = ELF::R_AARCH64_MOVW_UABS_G3;
 145       break;
 146     case AArch64::fixup_a64_movw_sabs_g0:
 147       Type = ELF::R_AARCH64_MOVW_SABS_G0;
 148       break;
 149     case AArch64::fixup_a64_movw_sabs_g1:
 150       Type = ELF::R_AARCH64_MOVW_SABS_G1;
 151       break;
 152     case AArch64::fixup_a64_movw_sabs_g2:
 153       Type = ELF::R_AARCH64_MOVW_SABS_G2;
 154       break;
 155
 156     // TLS Local-dynamic block
 157     case AArch64::fixup_a64_movw_dtprel_g2:
 158       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G2;
 159       break;
 160     case AArch64::fixup_a64_movw_dtprel_g1:
 161       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G1;
 162       break;
 163     case AArch64::fixup_a64_movw_dtprel_g1_nc:
 164       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G1_NC;
 165       break;
 166     case AArch64::fixup_a64_movw_dtprel_g0:
 167       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G0;
 168       break;
 169     case AArch64::fixup_a64_movw_dtprel_g0_nc:
 170       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC;
 171       break;
 172     case AArch64::fixup_a64_add_dtprel_hi12:
 173       Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_HI12;
 174       break;
 175     case AArch64::fixup_a64_add_dtprel_lo12:
 176       Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_LO12;
 177       break;
 178     case AArch64::fixup_a64_add_dtprel_lo12_nc:
 179       Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC;
 180       break;
 181     case AArch64::fixup_a64_ldst8_dtprel_lo12:
 182       Type = ELF::R_AARCH64_TLSLD_LDST8_DTPREL_LO12;
 183       break;
 184     case AArch64::fixup_a64_ldst8_dtprel_lo12_nc:
 185       Type = ELF::R_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC;
 186       break;
 187     case AArch64::fixup_a64_ldst16_dtprel_lo12:
 188       Type = ELF::R_AARCH64_TLSLD_LDST16_DTPREL_LO12;
 189       break;
 190     case AArch64::fixup_a64_ldst16_dtprel_lo12_nc:
 191       Type = ELF::R_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC;
 192       break;
 193     case AArch64::fixup_a64_ldst32_dtprel_lo12:
 194       Type = ELF::R_AARCH64_TLSLD_LDST32_DTPREL_LO12;
 195       break;
 196     case AArch64::fixup_a64_ldst32_dtprel_lo12_nc:
 197       Type = ELF::R_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC;
 198       break;
 199     case AArch64::fixup_a64_ldst64_dtprel_lo12:
 200       Type = ELF::R_AARCH64_TLSLD_LDST64_DTPREL_LO12;
 201       break;
 202     case AArch64::fixup_a64_ldst64_dtprel_lo12_nc:
 203       Type = ELF::R_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC;
 204       break;
 205
 206     // TLS initial-exec block
 207     case AArch64::fixup_a64_movw_gottprel_g1:
 208       Type = ELF::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1;
 209       break;
 210     case AArch64::fixup_a64_movw_gottprel_g0_nc:
 211       Type = ELF::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC;
 212       break;
 213     case AArch64::fixup_a64_ld64_gottprel_lo12_nc:
 214       Type = ELF::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC;
 215       break;
 216
 217     // TLS local-exec block
 218     case AArch64::fixup_a64_movw_tprel_g2:
 219       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G2;
 220       break;
 221     case AArch64::fixup_a64_movw_tprel_g1:
 222       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G1;
 223       break;
 224     case AArch64::fixup_a64_movw_tprel_g1_nc:
 225       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC;
 226       break;
 227     case AArch64::fixup_a64_movw_tprel_g0:
 228       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G0;
 229       break;
 230     case AArch64::fixup_a64_movw_tprel_g0_nc:
 231       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC;
 232       break;
 233     case AArch64::fixup_a64_add_tprel_hi12:
 234       Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_HI12;
 235       break;
 236     case AArch64::fixup_a64_add_tprel_lo12:
 237       Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_LO12;
 238       break;
 239     case AArch64::fixup_a64_add_tprel_lo12_nc:
 240       Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC;
 241       break;
 242     case AArch64::fixup_a64_ldst8_tprel_lo12:
 243       Type = ELF::R_AARCH64_TLSLE_LDST8_TPREL_LO12;
 244       break;
 245     case AArch64::fixup_a64_ldst8_tprel_lo12_nc:
 246       Type = ELF::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC;
 247       break;
 248     case AArch64::fixup_a64_ldst16_tprel_lo12:
 249       Type = ELF::R_AARCH64_TLSLE_LDST16_TPREL_LO12;
 250       break;
 251     case AArch64::fixup_a64_ldst16_tprel_lo12_nc:
 252       Type = ELF::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC;
 253       break;
 254     case AArch64::fixup_a64_ldst32_tprel_lo12:
 255       Type = ELF::R_AARCH64_TLSLE_LDST32_TPREL_LO12;
 256       break;
 257     case AArch64::fixup_a64_ldst32_tprel_lo12_nc:
 258       Type = ELF::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC;
 259       break;
 260     case AArch64::fixup_a64_ldst64_tprel_lo12:
 261       Type = ELF::R_AARCH64_TLSLE_LDST64_TPREL_LO12;
 262       break;
 263     case AArch64::fixup_a64_ldst64_tprel_lo12_nc:
 264       Type = ELF::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC;
 265       break;
 266
 267     // TLS general-dynamic block
 268     case AArch64::fixup_a64_tlsdesc_adr_page:
 269       Type = ELF::R_AARCH64_TLSDESC_ADR_PAGE;
 270       break;
 271     case AArch64::fixup_a64_tlsdesc_ld64_lo12_nc:
 272       Type = ELF::R_AARCH64_TLSDESC_LD64_LO12_NC;
 273       break;
 274     case AArch64::fixup_a64_tlsdesc_add_lo12_nc:
 275       Type = ELF::R_AARCH64_TLSDESC_ADD_LO12_NC;
 276       break;
 277     case AArch64::fixup_a64_tlsdesc_call:
 278       Type = ELF::R_AARCH64_TLSDESC_CALL;
 279       break;
 280     }
 281   }
 282
 283   return Type;
 284 }
 285
 286 MCObjectWriter *llvm::createAArch64ELFObjectWriter(raw_ostream &OS,
 287                                                    uint8_t OSABI,
 288                                                    bool IsLittleEndian) {
 289   MCELFObjectTargetWriter *MOTW = new AArch64ELFObjectWriter(OSABI, IsLittleEndian);
 290   return createELFObjectWriter(MOTW, OS,  IsLittleEndian);
 291 }