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      1 //===-- MipsBaseInfo.h - Top level definitions for MIPS MC ------*- C++ -*-===//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 //
      9 // This file contains small standalone helper functions and enum definitions for
     10 // the Mips target useful for the compiler back-end and the MC libraries.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 #ifndef LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSBASEINFO_H
     14 #define LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSBASEINFO_H
     15 
     16 #include "MipsFixupKinds.h"
     17 #include "MipsMCTargetDesc.h"
     18 #include "llvm/MC/MCExpr.h"
     19 #include "llvm/MC/MCInstrDesc.h"
     20 #include "llvm/Support/DataTypes.h"
     21 #include "llvm/Support/ErrorHandling.h"
     22 
     23 namespace llvm {
     24 
     25 /// MipsII - This namespace holds all of the target specific flags that
     26 /// instruction info tracks.
     27 ///
     28 namespace MipsII {
     29   /// Target Operand Flag enum.
     30   enum TOF {
     31     //===------------------------------------------------------------------===//
     32     // Mips Specific MachineOperand flags.
     33 
     34     MO_NO_FLAG,
     35 
     36     /// MO_GOT - Represents the offset into the global offset table at which
     37     /// the address the relocation entry symbol resides during execution.
     38     MO_GOT,
     39 
     40     /// MO_GOT_CALL - Represents the offset into the global offset table at
     41     /// which the address of a call site relocation entry symbol resides
     42     /// during execution. This is different from the above since this flag
     43     /// can only be present in call instructions.
     44     MO_GOT_CALL,
     45 
     46     /// MO_GPREL - Represents the offset from the current gp value to be used
     47     /// for the relocatable object file being produced.
     48     MO_GPREL,
     49 
     50     /// MO_ABS_HI/LO - Represents the hi or low part of an absolute symbol
     51     /// address.
     52     MO_ABS_HI,
     53     MO_ABS_LO,
     54 
     55     /// MO_TLSGD - Represents the offset into the global offset table at which
     56     // the module ID and TSL block offset reside during execution (General
     57     // Dynamic TLS).
     58     MO_TLSGD,
     59 
     60     /// MO_TLSLDM - Represents the offset into the global offset table at which
     61     // the module ID and TSL block offset reside during execution (Local
     62     // Dynamic TLS).
     63     MO_TLSLDM,
     64     MO_DTPREL_HI,
     65     MO_DTPREL_LO,
     66 
     67     /// MO_GOTTPREL - Represents the offset from the thread pointer (Initial
     68     // Exec TLS).
     69     MO_GOTTPREL,
     70 
     71     /// MO_TPREL_HI/LO - Represents the hi and low part of the offset from
     72     // the thread pointer (Local Exec TLS).
     73     MO_TPREL_HI,
     74     MO_TPREL_LO,
     75 
     76     // N32/64 Flags.
     77     MO_GPOFF_HI,
     78     MO_GPOFF_LO,
     79     MO_GOT_DISP,
     80     MO_GOT_PAGE,
     81     MO_GOT_OFST,
     82 
     83     /// MO_HIGHER/HIGHEST - Represents the highest or higher half word of a
     84     /// 64-bit symbol address.
     85     MO_HIGHER,
     86     MO_HIGHEST,
     87 
     88     /// MO_GOT_HI16/LO16, MO_CALL_HI16/LO16 - Relocations used for large GOTs.
     89     MO_GOT_HI16,
     90     MO_GOT_LO16,
     91     MO_CALL_HI16,
     92     MO_CALL_LO16,
     93 
     94     /// Helper operand used to generate R_MIPS_JALR
     95     MO_JALR
     96   };
     97 
     98   enum {
     99     //===------------------------------------------------------------------===//
    100     // Instruction encodings.  These are the standard/most common forms for
    101     // Mips instructions.
    102     //
    103 
    104     // Pseudo - This represents an instruction that is a pseudo instruction
    105     // or one that has not been implemented yet.  It is illegal to code generate
    106     // it, but tolerated for intermediate implementation stages.
    107     Pseudo   = 0,
    108 
    109     /// FrmR - This form is for instructions of the format R.
    110     FrmR  = 1,
    111     /// FrmI - This form is for instructions of the format I.
    112     FrmI  = 2,
    113     /// FrmJ - This form is for instructions of the format J.
    114     FrmJ  = 3,
    115     /// FrmFR - This form is for instructions of the format FR.
    116     FrmFR = 4,
    117     /// FrmFI - This form is for instructions of the format FI.
    118     FrmFI = 5,
    119     /// FrmOther - This form is for instructions that have no specific format.
    120     FrmOther = 6,
    121 
    122     FormMask = 15,
    123     /// IsCTI - Instruction is a Control Transfer Instruction.
    124     IsCTI = 1 << 4,
    125     /// HasForbiddenSlot - Instruction has a forbidden slot.
    126     HasForbiddenSlot = 1 << 5,
    127     /// HasFCCRegOperand - Instruction uses an $fcc<x> register.
    128     HasFCCRegOperand = 1 << 6
    129 
    130   };
    131 
    132   enum OperandType : unsigned {
    133     OPERAND_FIRST_MIPS_MEM_IMM = MCOI::OPERAND_FIRST_TARGET,
    134     OPERAND_MEM_SIMM9 = OPERAND_FIRST_MIPS_MEM_IMM,
    135     OPERAND_LAST_MIPS_MEM_IMM = OPERAND_MEM_SIMM9
    136   };
    137 }
    138 }
    139 
    140 #endif
    141