src/llvm/include/llvm/Support/ARMEHABI.h

   1 //===--- ARMEHABI.h - ARM Exception Handling ABI ----------------*- 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 // The enumerations and constants in this file reflect the ARM EHABI
  14 // Specification as published by ARM.
  15 //
  16 // Exception Handling ABI for the ARM Architecture r2.09 - November 30, 2012
  17 //
  18 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0038a/IHI0038A_ehabi.pdf
  19 //
  20 //===----------------------------------------------------------------------===//
  21
  22 #ifndef LLVM_SUPPORT_ARMEHABI_H
  23 #define LLVM_SUPPORT_ARMEHABI_H
  24
  25 namespace llvm {
  26 namespace ARM {
  27 namespace EHABI {
  28   /// ARM exception handling table entry kinds
  29   enum EHTEntryKind {
  30     EHT_GENERIC = 0x00,
  31     EHT_COMPACT = 0x80
  32   };
  33
  34   enum {
  35     /// Special entry for the function never unwind
  36     EXIDX_CANTUNWIND = 0x1
  37   };
  38
  39   /// ARM-defined frame unwinding opcodes
  40   enum UnwindOpcodes {
  41     // Format: 00xxxxxx
  42     // Purpose: vsp = vsp + ((x << 2) + 4)
  43     UNWIND_OPCODE_INC_VSP = 0x00,
  44
  45     // Format: 01xxxxxx
  46     // Purpose: vsp = vsp - ((x << 2) + 4)
  47     UNWIND_OPCODE_DEC_VSP = 0x40,
  48
  49     // Format: 10000000 00000000
  50     // Purpose: refuse to unwind
  51     UNWIND_OPCODE_REFUSE = 0x8000,
  52
  53     // Format: 1000xxxx xxxxxxxx
  54     // Purpose: pop r[15:12], r[11:4]
  55     // Constraint: x != 0
  56     UNWIND_OPCODE_POP_REG_MASK_R4 = 0x8000,
  57
  58     // Format: 1001xxxx
  59     // Purpose: vsp = r[x]
  60     // Constraint: x != 13 && x != 15
  61     UNWIND_OPCODE_SET_VSP = 0x90,
  62
  63     // Format: 10100xxx
  64     // Purpose: pop r[(4+x):4]
  65     UNWIND_OPCODE_POP_REG_RANGE_R4 = 0xa0,
  66
  67     // Format: 10101xxx
  68     // Purpose: pop r14, r[(4+x):4]
  69     UNWIND_OPCODE_POP_REG_RANGE_R4_R14 = 0xa8,
  70
  71     // Format: 10110000
  72     // Purpose: finish
  73     UNWIND_OPCODE_FINISH = 0xb0,
  74
  75     // Format: 10110001 0000xxxx
  76     // Purpose: pop r[3:0]
  77     // Constraint: x != 0
  78     UNWIND_OPCODE_POP_REG_MASK = 0xb100,
  79
  80     // Format: 10110010 x(uleb128)
  81     // Purpose: vsp = vsp + ((x << 2) + 0x204)
  82     UNWIND_OPCODE_INC_VSP_ULEB128 = 0xb2,
  83
  84     // Format: 10110011 xxxxyyyy
  85     // Purpose: pop d[(x+y):x]
  86     UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDX = 0xb300,
  87
  88     // Format: 10111xxx
  89     // Purpose: pop d[(8+x):8]
  90     UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDX_D8 = 0xb8,
  91
  92     // Format: 11000xxx
  93     // Purpose: pop wR[(10+x):10]
  94     UNWIND_OPCODE_POP_WIRELESS_MMX_REG_RANGE_WR10 = 0xc0,
  95
  96     // Format: 11000110 xxxxyyyy
  97     // Purpose: pop wR[(x+y):x]
  98     UNWIND_OPCODE_POP_WIRELESS_MMX_REG_RANGE = 0xc600,
  99
 100     // Format: 11000111 0000xxxx
 101     // Purpose: pop wCGR[3:0]
 102     // Constraint: x != 0
 103     UNWIND_OPCODE_POP_WIRELESS_MMX_REG_MASK = 0xc700,
 104
 105     // Format: 11001000 xxxxyyyy
 106     // Purpose: pop d[(16+x+y):(16+x)]
 107     UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD_D16 = 0xc800,
 108
 109     // Format: 11001001 xxxxyyyy
 110     // Purpose: pop d[(x+y):x]
 111     UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD = 0xc900,
 112
 113     // Format: 11010xxx
 114     // Purpose: pop d[(8+x):8]
 115     UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD_D8 = 0xd0
 116   };
 117
 118   /// ARM-defined Personality Routine Index
 119   enum PersonalityRoutineIndex {
 120     // To make the exception handling table become more compact, ARM defined
 121     // several personality routines in EHABI.  There are 3 different
 122     // personality routines in ARM EHABI currently.  It is possible to have 16
 123     // pre-defined personality routines at most.
 124     AEABI_UNWIND_CPP_PR0 = 0,
 125     AEABI_UNWIND_CPP_PR1 = 1,
 126     AEABI_UNWIND_CPP_PR2 = 2,
 127
 128     NUM_PERSONALITY_INDEX
 129   };
 130 }
 131 }
 132 }
 133
 134 #endif