include/llvm/Support/ARMBuildAttributes.h

   1 //===-- ARMBuildAttributes.h - ARM Build Attributes -------------*- 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 enumerations and support routines for ARM build attributes
  10 // as defined in ARM ABI addenda document (ABI release 2.08).
  11 //
  12 // ELF for the ARM Architecture r2.09 - November 30, 2012
  13 //
  14 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044e/IHI0044E_aaelf.pdf
  15 //
  16 //===----------------------------------------------------------------------===//
  17
  18 #ifndef LLVM_SUPPORT_ARMBUILDATTRIBUTES_H
  19 #define LLVM_SUPPORT_ARMBUILDATTRIBUTES_H
  20
  21 namespace llvm {
  22 class StringRef;
  23
  24 namespace ARMBuildAttrs {
  25
  26 enum SpecialAttr {
  27   // This is for the .cpu asm attr. It translates into one or more
  28   // AttrType (below) entries in the .ARM.attributes section in the ELF.
  29   SEL_CPU
  30 };
  31
  32 enum AttrType {
  33   // Rest correspond to ELF/.ARM.attributes
  34   File                      = 1,
  35   CPU_raw_name              = 4,
  36   CPU_name                  = 5,
  37   CPU_arch                  = 6,
  38   CPU_arch_profile          = 7,
  39   ARM_ISA_use               = 8,
  40   THUMB_ISA_use             = 9,
  41   FP_arch                   = 10,
  42   WMMX_arch                 = 11,
  43   Advanced_SIMD_arch        = 12,
  44   PCS_config                = 13,
  45   ABI_PCS_R9_use            = 14,
  46   ABI_PCS_RW_data           = 15,
  47   ABI_PCS_RO_data           = 16,
  48   ABI_PCS_GOT_use           = 17,
  49   ABI_PCS_wchar_t           = 18,
  50   ABI_FP_rounding           = 19,
  51   ABI_FP_denormal           = 20,
  52   ABI_FP_exceptions         = 21,
  53   ABI_FP_user_exceptions    = 22,
  54   ABI_FP_number_model       = 23,
  55   ABI_align_needed          = 24,
  56   ABI_align_preserved       = 25,
  57   ABI_enum_size             = 26,
  58   ABI_HardFP_use            = 27,
  59   ABI_VFP_args              = 28,
  60   ABI_WMMX_args             = 29,
  61   ABI_optimization_goals    = 30,
  62   ABI_FP_optimization_goals = 31,
  63   compatibility             = 32,
  64   CPU_unaligned_access      = 34,
  65   FP_HP_extension           = 36,
  66   ABI_FP_16bit_format       = 38,
  67   MPextension_use           = 42, // recoded from 70 (ABI r2.08)
  68   DIV_use                   = 44,
  69   DSP_extension             = 46,
  70   also_compatible_with      = 65,
  71   conformance               = 67,
  72   Virtualization_use        = 68,
  73
  74   /// Legacy Tags
  75   Section                   = 2,  // deprecated (ABI r2.09)
  76   Symbol                    = 3,  // deprecated (ABI r2.09)
  77   ABI_align8_needed         = 24, // renamed to ABI_align_needed (ABI r2.09)
  78   ABI_align8_preserved      = 25, // renamed to ABI_align_preserved (ABI r2.09)
  79   nodefaults                = 64, // deprecated (ABI r2.09)
  80   T2EE_use                  = 66, // deprecated (ABI r2.09)
  81   MPextension_use_old       = 70  // recoded to MPextension_use (ABI r2.08)
  82 };
  83
  84 StringRef AttrTypeAsString(unsigned Attr, bool HasTagPrefix = true);
  85 StringRef AttrTypeAsString(AttrType Attr, bool HasTagPrefix = true);
  86 int AttrTypeFromString(StringRef Tag);
  87
  88 // Magic numbers for .ARM.attributes
  89 enum AttrMagic {
  90   Format_Version  = 0x41
  91 };
  92
  93 // Legal Values for CPU_arch, (=6), uleb128
  94 enum CPUArch {
  95   Pre_v4   = 0,
  96   v4       = 1,   // e.g. SA110
  97   v4T      = 2,   // e.g. ARM7TDMI
  98   v5T      = 3,   // e.g. ARM9TDMI
  99   v5TE     = 4,   // e.g. ARM946E_S
 100   v5TEJ    = 5,   // e.g. ARM926EJ_S
 101   v6       = 6,   // e.g. ARM1136J_S
 102   v6KZ     = 7,   // e.g. ARM1176JZ_S
 103   v6T2     = 8,   // e.g. ARM1156T2_S
 104   v6K      = 9,   // e.g. ARM1176JZ_S
 105   v7       = 10,  // e.g. Cortex A8, Cortex M3
 106   v6_M     = 11,  // e.g. Cortex M1
 107   v6S_M    = 12,  // v6_M with the System extensions
 108   v7E_M    = 13,  // v7_M with DSP extensions
 109   v8_A     = 14,  // v8_A AArch32
 110   v8_R     = 15,  // e.g. Cortex R52
 111   v8_M_Base= 16,  // v8_M_Base AArch32
 112   v8_M_Main= 17,  // v8_M_Main AArch32
 113 };
 114
 115 enum CPUArchProfile {               // (=7), uleb128
 116   Not_Applicable          = 0,      // pre v7, or cross-profile code
 117   ApplicationProfile      = (0x41), // 'A' (e.g. for Cortex A8)
 118   RealTimeProfile         = (0x52), // 'R' (e.g. for Cortex R4)
 119   MicroControllerProfile  = (0x4D), // 'M' (e.g. for Cortex M3)
 120   SystemProfile           = (0x53)  // 'S' Application or real-time profile
 121 };
 122
 123 // The following have a lot of common use cases
 124 enum {
 125   Not_Allowed = 0,
 126   Allowed = 1,
 127
 128   // Tag_ARM_ISA_use (=8), uleb128
 129
 130   // Tag_THUMB_ISA_use, (=9), uleb128
 131   AllowThumb32 = 2, // 32-bit Thumb (implies 16-bit instructions)
 132   AllowThumbDerived = 3, // Thumb allowed, derived from arch/profile
 133
 134   // Tag_FP_arch (=10), uleb128 (formerly Tag_VFP_arch = 10)
 135   AllowFPv2  = 2,     // v2 FP ISA permitted (implies use of the v1 FP ISA)
 136   AllowFPv3A = 3,     // v3 FP ISA permitted (implies use of the v2 FP ISA)
 137   AllowFPv3B = 4,     // v3 FP ISA permitted, but only D0-D15, S0-S31
 138   AllowFPv4A = 5,     // v4 FP ISA permitted (implies use of v3 FP ISA)
 139   AllowFPv4B = 6,     // v4 FP ISA was permitted, but only D0-D15, S0-S31
 140   AllowFPARMv8A = 7,  // Use of the ARM v8-A FP ISA was permitted
 141   AllowFPARMv8B = 8,  // Use of the ARM v8-A FP ISA was permitted, but only
 142                       // D0-D15, S0-S31
 143
 144   // Tag_WMMX_arch, (=11), uleb128
 145   AllowWMMXv1 = 1,  // The user permitted this entity to use WMMX v1
 146   AllowWMMXv2 = 2,  // The user permitted this entity to use WMMX v2
 147
 148   // Tag_Advanced_SIMD_arch, (=12), uleb128
 149   AllowNeon = 1,      // SIMDv1 was permitted
 150   AllowNeon2 = 2,     // SIMDv2 was permitted (Half-precision FP, MAC operations)
 151   AllowNeonARMv8 = 3, // ARM v8-A SIMD was permitted
 152   AllowNeonARMv8_1a = 4,// ARM v8.1-A SIMD was permitted (RDMA)
 153
 154   // Tag_ABI_PCS_R9_use, (=14), uleb128
 155   R9IsGPR = 0,        // R9 used as v6 (just another callee-saved register)
 156   R9IsSB = 1,         // R9 used as a global static base rgister
 157   R9IsTLSPointer = 2, // R9 used as a thread local storage pointer
 158   R9Reserved = 3,     // R9 not used by code associated with attributed entity
 159
 160   // Tag_ABI_PCS_RW_data, (=15), uleb128
 161   AddressRWPCRel = 1, // Address RW static data PC-relative
 162   AddressRWSBRel = 2, // Address RW static data SB-relative
 163   AddressRWNone = 3, // No RW static data permitted
 164
 165   // Tag_ABI_PCS_RO_data, (=14), uleb128
 166   AddressROPCRel = 1, // Address RO static data PC-relative
 167   AddressRONone = 2, // No RO static data permitted
 168
 169   // Tag_ABI_PCS_GOT_use, (=17), uleb128
 170   AddressDirect = 1, // Address imported data directly
 171   AddressGOT = 2, // Address imported data indirectly (via GOT)
 172
 173   // Tag_ABI_PCS_wchar_t, (=18), uleb128
 174   WCharProhibited = 0,  // wchar_t is not used
 175   WCharWidth2Bytes = 2, // sizeof(wchar_t) == 2
 176   WCharWidth4Bytes = 4, // sizeof(wchar_t) == 4
 177
 178   // Tag_ABI_align_needed, (=24), uleb128
 179   Align8Byte = 1,
 180   Align4Byte = 2,
 181   AlignReserved = 3,
 182
 183   // Tag_ABI_align_needed, (=25), uleb128
 184   AlignNotPreserved = 0,
 185   AlignPreserve8Byte = 1,
 186   AlignPreserveAll = 2,
 187
 188   // Tag_ABI_FP_denormal, (=20), uleb128
 189   PositiveZero = 0,
 190   IEEEDenormals = 1,
 191   PreserveFPSign = 2, // sign when flushed-to-zero is preserved
 192
 193   // Tag_ABI_FP_number_model, (=23), uleb128
 194   AllowIEEENormal = 1,
 195   AllowRTABI = 2,  // numbers, infinities, and one quiet NaN (see [RTABI])
 196   AllowIEEE754 = 3, // this code to use all the IEEE 754-defined FP encodings
 197
 198   // Tag_ABI_enum_size, (=26), uleb128
 199   EnumProhibited = 0, // The user prohibited the use of enums when building
 200                       // this entity.
 201   EnumSmallest = 1,   // Enum is smallest container big enough to hold all
 202                       // values.
 203   Enum32Bit = 2,      // Enum is at least 32 bits.
 204   Enum32BitABI = 3,   // Every enumeration visible across an ABI-complying
 205                       // interface contains a value needing 32 bits to encode
 206                       // it; other enums can be containerized.
 207
 208   // Tag_ABI_HardFP_use, (=27), uleb128
 209   HardFPImplied = 0,          // FP use should be implied by Tag_FP_arch
 210   HardFPSinglePrecision = 1,  // Single-precision only
 211
 212   // Tag_ABI_VFP_args, (=28), uleb128
 213   BaseAAPCS = 0,
 214   HardFPAAPCS = 1,
 215   ToolChainFPPCS = 2,
 216   CompatibleFPAAPCS = 3,
 217
 218   // Tag_FP_HP_extension, (=36), uleb128
 219   AllowHPFP = 1, // Allow use of Half Precision FP
 220
 221   // Tag_FP_16bit_format, (=38), uleb128
 222   FP16FormatIEEE = 1,
 223   FP16VFP3 = 2,
 224
 225   // Tag_MPextension_use, (=42), uleb128
 226   AllowMP = 1, // Allow use of MP extensions
 227
 228   // Tag_DIV_use, (=44), uleb128
 229   // Note: AllowDIVExt must be emitted if and only if the permission to use
 230   // hardware divide cannot be conveyed using AllowDIVIfExists or DisallowDIV
 231   AllowDIVIfExists = 0, // Allow hardware divide if available in arch, or no
 232                         // info exists.
 233   DisallowDIV = 1,      // Hardware divide explicitly disallowed.
 234   AllowDIVExt = 2,      // Allow hardware divide as optional architecture
 235                         // extension above the base arch specified by
 236                         // Tag_CPU_arch and Tag_CPU_arch_profile.
 237
 238   // Tag_Virtualization_use, (=68), uleb128
 239   AllowTZ = 1,
 240   AllowVirtualization = 2,
 241   AllowTZVirtualization = 3
 242 };
 243
 244 } // namespace ARMBuildAttrs
 245 } // namespace llvm
 246
 247 #endif