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 } 108 } 109 110 #endif 111