lib/Target/ARM/MCTargetDesc/ARMFixupKinds.h

   1 //===-- ARMFixupKinds.h - ARM Specific Fixup Entries ------------*- C++ -*-===//
   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 #ifndef LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMFIXUPKINDS_H
  11 #define LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMFIXUPKINDS_H
  12
  13 #include "llvm/MC/MCFixup.h"
  14
  15 namespace llvm {
  16 namespace ARM {
  17 enum Fixups {
  18   // fixup_arm_ldst_pcrel_12 - 12-bit PC relative relocation for symbol
  19   // addresses
  20   fixup_arm_ldst_pcrel_12 = FirstTargetFixupKind,
  21
  22   // fixup_t2_ldst_pcrel_12 - Equivalent to fixup_arm_ldst_pcrel_12, with
  23   // the 16-bit halfwords reordered.
  24   fixup_t2_ldst_pcrel_12,
  25
  26   // fixup_arm_pcrel_10_unscaled - 10-bit PC relative relocation for symbol
  27   // addresses used in LDRD/LDRH/LDRB/etc. instructions. All bits are encoded.
  28   fixup_arm_pcrel_10_unscaled,
  29   // fixup_arm_pcrel_10 - 10-bit PC relative relocation for symbol addresses
  30   // used in VFP instructions where the lower 2 bits are not encoded
  31   // (so it's encoded as an 8-bit immediate).
  32   fixup_arm_pcrel_10,
  33   // fixup_t2_pcrel_10 - Equivalent to fixup_arm_pcrel_10, accounting for
  34   // the short-swapped encoding of Thumb2 instructions.
  35   fixup_t2_pcrel_10,
  36   // fixup_thumb_adr_pcrel_10 - 10-bit PC relative relocation for symbol
  37   // addresses where the lower 2 bits are not encoded (so it's encoded as an
  38   // 8-bit immediate).
  39   fixup_thumb_adr_pcrel_10,
  40   // fixup_arm_adr_pcrel_12 - 12-bit PC relative relocation for the ADR
  41   // instruction.
  42   fixup_arm_adr_pcrel_12,
  43   // fixup_t2_adr_pcrel_12 - 12-bit PC relative relocation for the ADR
  44   // instruction.
  45   fixup_t2_adr_pcrel_12,
  46   // fixup_arm_condbranch - 24-bit PC relative relocation for conditional branch
  47   // instructions.
  48   fixup_arm_condbranch,
  49   // fixup_arm_uncondbranch - 24-bit PC relative relocation for
  50   // branch instructions. (unconditional)
  51   fixup_arm_uncondbranch,
  52   // fixup_t2_condbranch - 20-bit PC relative relocation for Thumb2 direct
  53   // uconditional branch instructions.
  54   fixup_t2_condbranch,
  55   // fixup_t2_uncondbranch - 20-bit PC relative relocation for Thumb2 direct
  56   // branch unconditional branch instructions.
  57   fixup_t2_uncondbranch,
  58
  59   // fixup_arm_thumb_br - 12-bit fixup for Thumb B instructions.
  60   fixup_arm_thumb_br,
  61
  62   // The following fixups handle the ARM BL instructions. These can be
  63   // conditionalised; however, the ARM ELF ABI requires a different relocation
  64   // in that case: R_ARM_JUMP24 instead of R_ARM_CALL. The difference is that
  65   // R_ARM_CALL is allowed to change the instruction to a BLX inline, which has
  66   // no conditional version; R_ARM_JUMP24 would have to insert a veneer.
  67   //
  68   // MachO does not draw a distinction between the two cases, so it will treat
  69   // fixup_arm_uncondbl and fixup_arm_condbl as identical fixups.
  70
  71   // fixup_arm_uncondbl - Fixup for unconditional ARM BL instructions.
  72   fixup_arm_uncondbl,
  73
  74   // fixup_arm_condbl - Fixup for ARM BL instructions with nontrivial
  75   // conditionalisation.
  76   fixup_arm_condbl,
  77
  78   // fixup_arm_blx - Fixup for ARM BLX instructions.
  79   fixup_arm_blx,
  80
  81   // fixup_arm_thumb_bl - Fixup for Thumb BL instructions.
  82   fixup_arm_thumb_bl,
  83
  84   // fixup_arm_thumb_blx - Fixup for Thumb BLX instructions.
  85   fixup_arm_thumb_blx,
  86
  87   // fixup_arm_thumb_cb - Fixup for Thumb branch instructions.
  88   fixup_arm_thumb_cb,
  89
  90   // fixup_arm_thumb_cp - Fixup for Thumb load/store from constant pool instrs.
  91   fixup_arm_thumb_cp,
  92
  93   // fixup_arm_thumb_bcc - Fixup for Thumb conditional branching instructions.
  94   fixup_arm_thumb_bcc,
  95
  96   // The next two are for the movt/movw pair
  97   // the 16bit imm field are split into imm{15-12} and imm{11-0}
  98   fixup_arm_movt_hi16, // :upper16:
  99   fixup_arm_movw_lo16, // :lower16:
 100   fixup_t2_movt_hi16, // :upper16:
 101   fixup_t2_movw_lo16, // :lower16:
 102
 103   // Marker
 104   LastTargetFixupKind,
 105   NumTargetFixupKinds = LastTargetFixupKind - FirstTargetFixupKind
 106 };
 107 } // namespace ARM
 108 } // namespace llvm
 109
 110 #endif