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 // 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 // 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 // Represents the offset from the current gp value to be used
47 // for the relocatable object file being produced.
48 MO_GPREL,
49
50 // Represents the hi or low part of an absolute symbol
51 // address.
52 MO_ABS_HI,
53 MO_ABS_LO,
54
55 // 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 // 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 // Represents the offset from the thread pointer (Initial
68 // Exec TLS).
69 MO_GOTTPREL,
70
71 // 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 // Represents the highest or higher half word of a
84 // 64-bit symbol address.
85 MO_HIGHER,
86 MO_HIGHEST,
87
88 // 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 // On a symbol operand "FOO", this indicates that the
98 // reference is actually to the "__imp_FOO" symbol. This is used for
99 // dllimport linkage on windows.
100 MO_DLLIMPORT = 0x20,
101 };
102
103 enum {
104 //===------------------------------------------------------------------===//
105 // Instruction encodings. These are the standard/most common forms for
106 // Mips instructions.
107 //
108
109 // This represents an instruction that is a pseudo instruction
110 // or one that has not been implemented yet. It is illegal to code generate
111 // it, but tolerated for intermediate implementation stages.
112 Pseudo = 0,
113
114 // This form is for instructions of the format R.
115 FrmR = 1,
116 // This form is for instructions of the format I.
117 FrmI = 2,
118 // This form is for instructions of the format J.
119 FrmJ = 3,
120 // This form is for instructions of the format FR.
121 FrmFR = 4,
122 // This form is for instructions of the format FI.
123 FrmFI = 5,
124 // This form is for instructions that have no specific format.
125 FrmOther = 6,
126
127 FormMask = 15,
128 // Instruction is a Control Transfer Instruction.
129 IsCTI = 1 << 4,
130 // Instruction has a forbidden slot.
131 HasForbiddenSlot = 1 << 5,
132 // Instruction uses an $fcc<x> register.
133 HasFCCRegOperand = 1 << 6
134
135 };
136
137 enum OperandType : unsigned {
138 OPERAND_FIRST_MIPS_MEM_IMM = MCOI::OPERAND_FIRST_TARGET,
139 OPERAND_MEM_SIMM9 = OPERAND_FIRST_MIPS_MEM_IMM,
140 OPERAND_LAST_MIPS_MEM_IMM = OPERAND_MEM_SIMM9
141 };
142
getFormat(uint64_t TSFlags)143 static inline unsigned getFormat(uint64_t TSFlags) {
144 return TSFlags & FormMask;
145 }
146 } // namespace MipsII
147
getMSARegFromFReg(MCRegister Reg)148 inline static MCRegister getMSARegFromFReg(MCRegister Reg) {
149 if (Reg >= Mips::F0 && Reg <= Mips::F31)
150 return Reg - Mips::F0 + Mips::W0;
151 else if (Reg >= Mips::D0_64 && Reg <= Mips::D31_64)
152 return Reg - Mips::D0_64 + Mips::W0;
153 else
154 return MCRegister();
155 }
156 } // namespace llvm
157
158 #endif
159