1 //===-- MipsBaseInfo.h - Top level definitions for MIPS MC ------*- 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 // This file contains small standalone helper functions and enum definitions for
11 // the Mips target useful for the compiler back-end and the MC libraries.
12 //
13 //===----------------------------------------------------------------------===//
14 #ifndef MIPSBASEINFO_H
15 #define MIPSBASEINFO_H
16
17 #include "MipsFixupKinds.h"
18 #include "MipsMCTargetDesc.h"
19 #include "llvm/MC/MCExpr.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_GOT16 - Represents the offset into the global offset table at which
37 /// the address the relocation entry symbol resides during execution.
38 MO_GOT16,
39 MO_GOT,
40
41 /// MO_GOT_CALL - Represents the offset into the global offset table at
42 /// which the address of a call site relocation entry symbol resides
43 /// during execution. This is different from the above since this flag
44 /// can only be present in call instructions.
45 MO_GOT_CALL,
46
47 /// MO_GPREL - Represents the offset from the current gp value to be used
48 /// for the relocatable object file being produced.
49 MO_GPREL,
50
51 /// MO_ABS_HI/LO - Represents the hi or low part of an absolute symbol
52 /// address.
53 MO_ABS_HI,
54 MO_ABS_LO,
55
56 /// MO_TLSGD - Represents the offset into the global offset table at which
57 // the module ID and TSL block offset reside during execution (General
58 // Dynamic TLS).
59 MO_TLSGD,
60
61 /// MO_TLSLDM - Represents the offset into the global offset table at which
62 // the module ID and TSL block offset reside during execution (Local
63 // Dynamic TLS).
64 MO_TLSLDM,
65 MO_DTPREL_HI,
66 MO_DTPREL_LO,
67
68 /// MO_GOTTPREL - Represents the offset from the thread pointer (Initial
69 // Exec TLS).
70 MO_GOTTPREL,
71
72 /// MO_TPREL_HI/LO - Represents the hi and low part of the offset from
73 // the thread pointer (Local Exec TLS).
74 MO_TPREL_HI,
75 MO_TPREL_LO,
76
77 // N32/64 Flags.
78 MO_GPOFF_HI,
79 MO_GPOFF_LO,
80 MO_GOT_DISP,
81 MO_GOT_PAGE,
82 MO_GOT_OFST,
83
84 /// MO_HIGHER/HIGHEST - Represents the highest or higher half word of a
85 /// 64-bit symbol address.
86 MO_HIGHER,
87 MO_HIGHEST,
88
89 /// MO_GOT_HI16/LO16, MO_CALL_HI16/LO16 - Relocations used for large GOTs.
90 MO_GOT_HI16,
91 MO_GOT_LO16,
92 MO_CALL_HI16,
93 MO_CALL_LO16
94 };
95
96 enum {
97 //===------------------------------------------------------------------===//
98 // Instruction encodings. These are the standard/most common forms for
99 // Mips instructions.
100 //
101
102 // Pseudo - This represents an instruction that is a pseudo instruction
103 // or one that has not been implemented yet. It is illegal to code generate
104 // it, but tolerated for intermediate implementation stages.
105 Pseudo = 0,
106
107 /// FrmR - This form is for instructions of the format R.
108 FrmR = 1,
109 /// FrmI - This form is for instructions of the format I.
110 FrmI = 2,
111 /// FrmJ - This form is for instructions of the format J.
112 FrmJ = 3,
113 /// FrmFR - This form is for instructions of the format FR.
114 FrmFR = 4,
115 /// FrmFI - This form is for instructions of the format FI.
116 FrmFI = 5,
117 /// FrmOther - This form is for instructions that have no specific format.
118 FrmOther = 6,
119
120 FormMask = 15
121 };
122 }
123
124 inline static std::pair<const MCSymbolRefExpr*, int64_t>
MipsGetSymAndOffset(const MCFixup & Fixup)125 MipsGetSymAndOffset(const MCFixup &Fixup) {
126 MCFixupKind FixupKind = Fixup.getKind();
127
128 if ((FixupKind < FirstTargetFixupKind) ||
129 (FixupKind >= MCFixupKind(Mips::LastTargetFixupKind)))
130 return std::make_pair((const MCSymbolRefExpr*)0, (int64_t)0);
131
132 const MCExpr *Expr = Fixup.getValue();
133 MCExpr::ExprKind Kind = Expr->getKind();
134
135 if (Kind == MCExpr::Binary) {
136 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr*>(Expr);
137 const MCExpr *LHS = BE->getLHS();
138 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(BE->getRHS());
139
140 if ((LHS->getKind() != MCExpr::SymbolRef) || !CE)
141 return std::make_pair((const MCSymbolRefExpr*)0, (int64_t)0);
142
143 return std::make_pair(cast<MCSymbolRefExpr>(LHS), CE->getValue());
144 }
145
146 if (Kind != MCExpr::SymbolRef)
147 return std::make_pair((const MCSymbolRefExpr*)0, (int64_t)0);
148
149 return std::make_pair(cast<MCSymbolRefExpr>(Expr), 0);
150 }
151 }
152
153 #endif
154