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69a7afba11
Some ARM instructions encode 32-bit immediates as a 8-bit integer (0-255) and a 4-bit rotation (0-30, even) in its least significant 12 bits. The original fixup, FK_Data_4, patches the instruction by the value bit-to-bit, regardless of the encoding. For example, assuming the label L1 and L2 are 0x0 and 0x104 respectively, the following instruction: add r0, r0, #(L2 - L1) ; expects 0x104, i.e., 260 would be assembled to the following, which adds 1 to r0, instead of 260: e2800104 add r0, r0, #4, 2 ; equivalently 1 The new fixup kind fixup_arm_mod_imm takes care of the encoding: e2800f41 add r0, r0, #260 Patch by Ting-Yuan Huang! llvm-svn: 265122
121 lines
4.4 KiB
C++
121 lines
4.4 KiB
C++
//===-- ARMFixupKinds.h - ARM Specific Fixup Entries ------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMFIXUPKINDS_H
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#define LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMFIXUPKINDS_H
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#include "llvm/MC/MCFixup.h"
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namespace llvm {
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namespace ARM {
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enum Fixups {
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// fixup_arm_ldst_pcrel_12 - 12-bit PC relative relocation for symbol
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// addresses
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fixup_arm_ldst_pcrel_12 = FirstTargetFixupKind,
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// fixup_t2_ldst_pcrel_12 - Equivalent to fixup_arm_ldst_pcrel_12, with
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// the 16-bit halfwords reordered.
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fixup_t2_ldst_pcrel_12,
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// fixup_arm_pcrel_10_unscaled - 10-bit PC relative relocation for symbol
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// addresses used in LDRD/LDRH/LDRB/etc. instructions. All bits are encoded.
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fixup_arm_pcrel_10_unscaled,
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// fixup_arm_pcrel_10 - 10-bit PC relative relocation for symbol addresses
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// used in VFP instructions where the lower 2 bits are not encoded
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// (so it's encoded as an 8-bit immediate).
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fixup_arm_pcrel_10,
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// fixup_t2_pcrel_10 - Equivalent to fixup_arm_pcrel_10, accounting for
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// the short-swapped encoding of Thumb2 instructions.
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fixup_t2_pcrel_10,
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// fixup_arm_pcrel_9 - 9-bit PC relative relocation for symbol addresses
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// used in VFP instructions where bit 0 not encoded (so it's encoded as an
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// 8-bit immediate).
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fixup_arm_pcrel_9,
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// fixup_t2_pcrel_9 - Equivalent to fixup_arm_pcrel_9, accounting for
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// the short-swapped encoding of Thumb2 instructions.
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fixup_t2_pcrel_9,
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// fixup_thumb_adr_pcrel_10 - 10-bit PC relative relocation for symbol
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// addresses where the lower 2 bits are not encoded (so it's encoded as an
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// 8-bit immediate).
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fixup_thumb_adr_pcrel_10,
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// fixup_arm_adr_pcrel_12 - 12-bit PC relative relocation for the ADR
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// instruction.
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fixup_arm_adr_pcrel_12,
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// fixup_t2_adr_pcrel_12 - 12-bit PC relative relocation for the ADR
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// instruction.
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fixup_t2_adr_pcrel_12,
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// fixup_arm_condbranch - 24-bit PC relative relocation for conditional branch
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// instructions.
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fixup_arm_condbranch,
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// fixup_arm_uncondbranch - 24-bit PC relative relocation for
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// branch instructions. (unconditional)
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fixup_arm_uncondbranch,
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// fixup_t2_condbranch - 20-bit PC relative relocation for Thumb2 direct
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// uconditional branch instructions.
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fixup_t2_condbranch,
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// fixup_t2_uncondbranch - 20-bit PC relative relocation for Thumb2 direct
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// branch unconditional branch instructions.
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fixup_t2_uncondbranch,
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// fixup_arm_thumb_br - 12-bit fixup for Thumb B instructions.
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fixup_arm_thumb_br,
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// The following fixups handle the ARM BL instructions. These can be
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// conditionalised; however, the ARM ELF ABI requires a different relocation
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// in that case: R_ARM_JUMP24 instead of R_ARM_CALL. The difference is that
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// R_ARM_CALL is allowed to change the instruction to a BLX inline, which has
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// no conditional version; R_ARM_JUMP24 would have to insert a veneer.
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//
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// MachO does not draw a distinction between the two cases, so it will treat
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// fixup_arm_uncondbl and fixup_arm_condbl as identical fixups.
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// fixup_arm_uncondbl - Fixup for unconditional ARM BL instructions.
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fixup_arm_uncondbl,
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// fixup_arm_condbl - Fixup for ARM BL instructions with nontrivial
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// conditionalisation.
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fixup_arm_condbl,
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// fixup_arm_blx - Fixup for ARM BLX instructions.
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fixup_arm_blx,
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// fixup_arm_thumb_bl - Fixup for Thumb BL instructions.
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fixup_arm_thumb_bl,
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// fixup_arm_thumb_blx - Fixup for Thumb BLX instructions.
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fixup_arm_thumb_blx,
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// fixup_arm_thumb_cb - Fixup for Thumb branch instructions.
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fixup_arm_thumb_cb,
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// fixup_arm_thumb_cp - Fixup for Thumb load/store from constant pool instrs.
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fixup_arm_thumb_cp,
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// fixup_arm_thumb_bcc - Fixup for Thumb conditional branching instructions.
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fixup_arm_thumb_bcc,
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// The next two are for the movt/movw pair
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// the 16bit imm field are split into imm{15-12} and imm{11-0}
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fixup_arm_movt_hi16, // :upper16:
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fixup_arm_movw_lo16, // :lower16:
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fixup_t2_movt_hi16, // :upper16:
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fixup_t2_movw_lo16, // :lower16:
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// fixup_arm_mod_imm - Fixup for mod_imm
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fixup_arm_mod_imm,
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// Marker
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LastTargetFixupKind,
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NumTargetFixupKinds = LastTargetFixupKind - FirstTargetFixupKind
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};
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}
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}
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#endif
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