ARMUnwindOp.h revision 251662 
1//===-- ARMUnwindOp.h - ARM Unwind Opcodes ----------------------*- 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 defines the constants for the ARM unwind opcodes and exception
11// handling table entry kinds.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef ARM_UNWIND_OP_H
16#define ARM_UNWIND_OP_H
17
18namespace llvm {
19
20  /// ARM exception handling table entry kinds
21  enum ARMEHTEntryKind {
22    EHT_GENERIC = 0x00,
23    EHT_COMPACT = 0x80
24  };
25
26  enum {
27    /// Special entry for the function never unwind
28    EXIDX_CANTUNWIND = 0x1
29  };
30
31  /// ARM-defined frame unwinding opcodes
32  enum ARMUnwindOpcodes {
33    // Format: 00xxxxxx
34    // Purpose: vsp = vsp + ((x << 2) + 4)
35    UNWIND_OPCODE_INC_VSP = 0x00,
36
37    // Format: 01xxxxxx
38    // Purpose: vsp = vsp - ((x << 2) + 4)
39    UNWIND_OPCODE_DEC_VSP = 0x40,
40
41    // Format: 10000000 00000000
42    // Purpose: refuse to unwind
43    UNWIND_OPCODE_REFUSE = 0x8000,
44
45    // Format: 1000xxxx xxxxxxxx
46    // Purpose: pop r[15:12], r[11:4]
47    // Constraint: x != 0
48    UNWIND_OPCODE_POP_REG_MASK_R4 = 0x8000,
49
50    // Format: 1001xxxx
51    // Purpose: vsp = r[x]
52    // Constraint: x != 13 && x != 15
53    UNWIND_OPCODE_SET_VSP = 0x90,
54
55    // Format: 10100xxx
56    // Purpose: pop r[(4+x):4]
57    UNWIND_OPCODE_POP_REG_RANGE_R4 = 0xa0,
58
59    // Format: 10101xxx
60    // Purpose: pop r14, r[(4+x):4]
61    UNWIND_OPCODE_POP_REG_RANGE_R4_R14 = 0xa8,
62
63    // Format: 10110000
64    // Purpose: finish
65    UNWIND_OPCODE_FINISH = 0xb0,
66
67    // Format: 10110001 0000xxxx
68    // Purpose: pop r[3:0]
69    // Constraint: x != 0
70    UNWIND_OPCODE_POP_REG_MASK = 0xb100,
71
72    // Format: 10110010 x(uleb128)
73    // Purpose: vsp = vsp + ((x << 2) + 0x204)
74    UNWIND_OPCODE_INC_VSP_ULEB128 = 0xb2,
75
76    // Format: 10110011 xxxxyyyy
77    // Purpose: pop d[(x+y):x]
78    UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDX = 0xb300,
79
80    // Format: 10111xxx
81    // Purpose: pop d[(8+x):8]
82    UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDX_D8 = 0xb8,
83
84    // Format: 11000xxx
85    // Purpose: pop wR[(10+x):10]
86    UNWIND_OPCODE_POP_WIRELESS_MMX_REG_RANGE_WR10 = 0xc0,
87
88    // Format: 11000110 xxxxyyyy
89    // Purpose: pop wR[(x+y):x]
90    UNWIND_OPCODE_POP_WIRELESS_MMX_REG_RANGE = 0xc600,
91
92    // Format: 11000111 0000xxxx
93    // Purpose: pop wCGR[3:0]
94    // Constraint: x != 0
95    UNWIND_OPCODE_POP_WIRELESS_MMX_REG_MASK = 0xc700,
96
97    // Format: 11001000 xxxxyyyy
98    // Purpose: pop d[(16+x+y):(16+x)]
99    UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD_D16 = 0xc800,
100
101    // Format: 11001001 xxxxyyyy
102    // Purpose: pop d[(x+y):x]
103    UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD = 0xc900,
104
105    // Format: 11010xxx
106    // Purpose: pop d[(8+x):8]
107    UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD_D8 = 0xd0
108  };
109
110  /// ARM-defined Personality Routine Index
111  enum ARMPersonalityRoutineIndex {
112    // To make the exception handling table become more compact, ARM defined
113    // several personality routines in EHABI.  There are 3 different
114    // personality routines in ARM EHABI currently.  It is possible to have 16
115    // pre-defined personality routines at most.
116    AEABI_UNWIND_CPP_PR0 = 0,
117    AEABI_UNWIND_CPP_PR1 = 1,
118    AEABI_UNWIND_CPP_PR2 = 2,
119
120    NUM_PERSONALITY_INDEX
121  };
122
123}
124
125#endif // ARM_UNWIND_OP_H
126