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, bool IsRelocWithSymbol) 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,
  49                                               bool IsRelocWithSymbol) const {
  50   unsigned Type;
  51   if (IsPCRel) {
  52     switch ((unsigned)Fixup.getKind()) {
  53     default:
  54       llvm_unreachable("Unimplemented fixup -> relocation");
  55     case FK_Data_8:
  56       return ELF::R_AARCH64_PREL64;
  57     case FK_Data_4:
  58       return ELF::R_AARCH64_PREL32;
  59     case FK_Data_2:
  60       return ELF::R_AARCH64_PREL16;
  61     case AArch64::fixup_a64_ld_prel:
  62       Type = ELF::R_AARCH64_LD_PREL_LO19;
  63       break;
  64     case AArch64::fixup_a64_adr_prel:
  65       Type = ELF::R_AARCH64_ADR_PREL_LO21;
  66       break;
  67     case AArch64::fixup_a64_adr_prel_page:
  68       Type = ELF::R_AARCH64_ADR_PREL_PG_HI21;
  69       break;
  70     case AArch64::fixup_a64_adr_prel_got_page:
  71       Type = ELF::R_AARCH64_ADR_GOT_PAGE;
  72       break;
  73     case AArch64::fixup_a64_tstbr:
  74       Type = ELF::R_AARCH64_TSTBR14;
  75       break;
  76     case AArch64::fixup_a64_condbr:
  77       Type = ELF::R_AARCH64_CONDBR19;
  78       break;
  79     case AArch64::fixup_a64_uncondbr:
  80       Type = ELF::R_AARCH64_JUMP26;
  81       break;
  82     case AArch64::fixup_a64_call:
  83       Type = ELF::R_AARCH64_CALL26;
  84       break;
  85     case AArch64::fixup_a64_adr_gottprel_page:
  86       Type = ELF::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21;
  87       break;
  88     case AArch64::fixup_a64_ld_gottprel_prel19:
  89       Type =  ELF::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19;
  90       break;
  91     case AArch64::fixup_a64_tlsdesc_adr_page:
  92       Type = ELF::R_AARCH64_TLSDESC_ADR_PAGE;
  93       break;
  94     }
  95   } else {
  96     switch ((unsigned)Fixup.getKind()) {
  97     default:
  98       llvm_unreachable("Unimplemented fixup -> relocation");
  99     case FK_Data_8:
 100       return ELF::R_AARCH64_ABS64;
 101     case FK_Data_4:
 102       return ELF::R_AARCH64_ABS32;
 103     case FK_Data_2:
 104       return ELF::R_AARCH64_ABS16;
 105     case AArch64::fixup_a64_add_lo12:
 106       Type = ELF::R_AARCH64_ADD_ABS_LO12_NC;
 107       break;
 108     case AArch64::fixup_a64_ld64_got_lo12_nc:
 109       Type = ELF::R_AARCH64_LD64_GOT_LO12_NC;
 110       break;
 111     case AArch64::fixup_a64_ldst8_lo12:
 112       Type = ELF::R_AARCH64_LDST8_ABS_LO12_NC;
 113       break;
 114     case AArch64::fixup_a64_ldst16_lo12:
 115       Type = ELF::R_AARCH64_LDST16_ABS_LO12_NC;
 116       break;
 117     case AArch64::fixup_a64_ldst32_lo12:
 118       Type = ELF::R_AARCH64_LDST32_ABS_LO12_NC;
 119       break;
 120     case AArch64::fixup_a64_ldst64_lo12:
 121       Type = ELF::R_AARCH64_LDST64_ABS_LO12_NC;
 122       break;
 123     case AArch64::fixup_a64_ldst128_lo12:
 124       Type = ELF::R_AARCH64_LDST128_ABS_LO12_NC;
 125       break;
 126     case AArch64::fixup_a64_movw_uabs_g0:
 127       Type = ELF::R_AARCH64_MOVW_UABS_G0;
 128       break;
 129     case AArch64::fixup_a64_movw_uabs_g0_nc:
 130       Type = ELF::R_AARCH64_MOVW_UABS_G0_NC;
 131       break;
 132     case AArch64::fixup_a64_movw_uabs_g1:
 133       Type = ELF::R_AARCH64_MOVW_UABS_G1;
 134       break;
 135     case AArch64::fixup_a64_movw_uabs_g1_nc:
 136       Type = ELF::R_AARCH64_MOVW_UABS_G1_NC;
 137       break;
 138     case AArch64::fixup_a64_movw_uabs_g2:
 139       Type = ELF::R_AARCH64_MOVW_UABS_G2;
 140       break;
 141     case AArch64::fixup_a64_movw_uabs_g2_nc:
 142       Type = ELF::R_AARCH64_MOVW_UABS_G2_NC;
 143       break;
 144     case AArch64::fixup_a64_movw_uabs_g3:
 145       Type = ELF::R_AARCH64_MOVW_UABS_G3;
 146       break;
 147     case AArch64::fixup_a64_movw_sabs_g0:
 148       Type = ELF::R_AARCH64_MOVW_SABS_G0;
 149       break;
 150     case AArch64::fixup_a64_movw_sabs_g1:
 151       Type = ELF::R_AARCH64_MOVW_SABS_G1;
 152       break;
 153     case AArch64::fixup_a64_movw_sabs_g2:
 154       Type = ELF::R_AARCH64_MOVW_SABS_G2;
 155       break;
 156
 157     // TLS Local-dynamic block
 158     case AArch64::fixup_a64_movw_dtprel_g2:
 159       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G2;
 160       break;
 161     case AArch64::fixup_a64_movw_dtprel_g1:
 162       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G1;
 163       break;
 164     case AArch64::fixup_a64_movw_dtprel_g1_nc:
 165       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G1_NC;
 166       break;
 167     case AArch64::fixup_a64_movw_dtprel_g0:
 168       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G0;
 169       break;
 170     case AArch64::fixup_a64_movw_dtprel_g0_nc:
 171       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC;
 172       break;
 173     case AArch64::fixup_a64_add_dtprel_hi12:
 174       Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_HI12;
 175       break;
 176     case AArch64::fixup_a64_add_dtprel_lo12:
 177       Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_LO12;
 178       break;
 179     case AArch64::fixup_a64_add_dtprel_lo12_nc:
 180       Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC;
 181       break;
 182     case AArch64::fixup_a64_ldst8_dtprel_lo12:
 183       Type = ELF::R_AARCH64_TLSLD_LDST8_DTPREL_LO12;
 184       break;
 185     case AArch64::fixup_a64_ldst8_dtprel_lo12_nc:
 186       Type = ELF::R_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC;
 187       break;
 188     case AArch64::fixup_a64_ldst16_dtprel_lo12:
 189       Type = ELF::R_AARCH64_TLSLD_LDST16_DTPREL_LO12;
 190       break;
 191     case AArch64::fixup_a64_ldst16_dtprel_lo12_nc:
 192       Type = ELF::R_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC;
 193       break;
 194     case AArch64::fixup_a64_ldst32_dtprel_lo12:
 195       Type = ELF::R_AARCH64_TLSLD_LDST32_DTPREL_LO12;
 196       break;
 197     case AArch64::fixup_a64_ldst32_dtprel_lo12_nc:
 198       Type = ELF::R_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC;
 199       break;
 200     case AArch64::fixup_a64_ldst64_dtprel_lo12:
 201       Type = ELF::R_AARCH64_TLSLD_LDST64_DTPREL_LO12;
 202       break;
 203     case AArch64::fixup_a64_ldst64_dtprel_lo12_nc:
 204       Type = ELF::R_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC;
 205       break;
 206
 207     // TLS initial-exec block
 208     case AArch64::fixup_a64_movw_gottprel_g1:
 209       Type = ELF::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1;
 210       break;
 211     case AArch64::fixup_a64_movw_gottprel_g0_nc:
 212       Type = ELF::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC;
 213       break;
 214     case AArch64::fixup_a64_ld64_gottprel_lo12_nc:
 215       Type = ELF::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC;
 216       break;
 217
 218     // TLS local-exec block
 219     case AArch64::fixup_a64_movw_tprel_g2:
 220       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G2;
 221       break;
 222     case AArch64::fixup_a64_movw_tprel_g1:
 223       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G1;
 224       break;
 225     case AArch64::fixup_a64_movw_tprel_g1_nc:
 226       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC;
 227       break;
 228     case AArch64::fixup_a64_movw_tprel_g0:
 229       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G0;
 230       break;
 231     case AArch64::fixup_a64_movw_tprel_g0_nc:
 232       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC;
 233       break;
 234     case AArch64::fixup_a64_add_tprel_hi12:
 235       Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_HI12;
 236       break;
 237     case AArch64::fixup_a64_add_tprel_lo12:
 238       Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_LO12;
 239       break;
 240     case AArch64::fixup_a64_add_tprel_lo12_nc:
 241       Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC;
 242       break;
 243     case AArch64::fixup_a64_ldst8_tprel_lo12:
 244       Type = ELF::R_AARCH64_TLSLE_LDST8_TPREL_LO12;
 245       break;
 246     case AArch64::fixup_a64_ldst8_tprel_lo12_nc:
 247       Type = ELF::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC;
 248       break;
 249     case AArch64::fixup_a64_ldst16_tprel_lo12:
 250       Type = ELF::R_AARCH64_TLSLE_LDST16_TPREL_LO12;
 251       break;
 252     case AArch64::fixup_a64_ldst16_tprel_lo12_nc:
 253       Type = ELF::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC;
 254       break;
 255     case AArch64::fixup_a64_ldst32_tprel_lo12:
 256       Type = ELF::R_AARCH64_TLSLE_LDST32_TPREL_LO12;
 257       break;
 258     case AArch64::fixup_a64_ldst32_tprel_lo12_nc:
 259       Type = ELF::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC;
 260       break;
 261     case AArch64::fixup_a64_ldst64_tprel_lo12:
 262       Type = ELF::R_AARCH64_TLSLE_LDST64_TPREL_LO12;
 263       break;
 264     case AArch64::fixup_a64_ldst64_tprel_lo12_nc:
 265       Type = ELF::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC;
 266       break;
 267
 268     // TLS general-dynamic block
 269     case AArch64::fixup_a64_tlsdesc_adr_page:
 270       Type = ELF::R_AARCH64_TLSDESC_ADR_PAGE;
 271       break;
 272     case AArch64::fixup_a64_tlsdesc_ld64_lo12_nc:
 273       Type = ELF::R_AARCH64_TLSDESC_LD64_LO12_NC;
 274       break;
 275     case AArch64::fixup_a64_tlsdesc_add_lo12_nc:
 276       Type = ELF::R_AARCH64_TLSDESC_ADD_LO12_NC;
 277       break;
 278     case AArch64::fixup_a64_tlsdesc_call:
 279       Type = ELF::R_AARCH64_TLSDESC_CALL;
 280       break;
 281     }
 282   }
 283
 284   return Type;
 285 }
 286
 287 MCObjectWriter *llvm::createAArch64ELFObjectWriter(raw_ostream &OS,
 288                                                    uint8_t OSABI,
 289                                                    bool IsLittleEndian) {
 290   MCELFObjectTargetWriter *MOTW = new AArch64ELFObjectWriter(OSABI, IsLittleEndian);
 291   return createELFObjectWriter(MOTW, OS,  IsLittleEndian);
 292 }