1 //===-- ELF_ARM.h - ARM ELF ABI ---------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains enumerations and support routines for ARM build attributes
11 // as defined in ARM ABI addenda document (ABI release 2.08).
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_OBJECT_ELF_ARM_H
16 #define LLVM_OBJECT_ELF_ARM_H
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/Support/Endian.h"
23 namespace ARMBuildAttrs {
25 // This is for the .cpu asm attr. It translates into one or more
26 // AttrType (below) entries in the .ARM.attributes section in the ELF.
31 // Rest correspond to ELF/.ARM.attributes
43 Advanced_SIMD_arch = 12,
52 ABI_FP_exceptions = 21,
53 ABI_FP_user_exceptions = 22,
54 ABI_FP_number_model = 23,
55 ABI_align8_needed = 24,
56 ABI_align8_preserved = 25,
61 ABI_optimization_goals = 30,
62 ABI_FP_optimization_goals = 31,
64 CPU_unaligned_access = 34,
66 ABI_FP_16bit_format = 38,
67 MPextension_use = 42, // was 70, 2.08 ABI
70 also_compatible_with = 65,
73 Virtualization_use = 68,
74 MPextension_use_old = 70
77 // Magic numbers for .ARM.attributes
82 // Legal Values for CPU_arch, (=6), uleb128
86 v4T = 2, // e.g. ARM7TDMI
87 v5T = 3, // e.g. ARM9TDMI
88 v5TE = 4, // e.g. ARM946E_S
89 v5TEJ = 5, // e.g. ARM926EJ_S
90 v6 = 6, // e.g. ARM1136J_S
91 v6KZ = 7, // e.g. ARM1176JZ_S
92 v6T2 = 8, // e.g. ARM1156T2F_S
93 v6K = 9, // e.g. ARM1136J_S
94 v7 = 10, // e.g. Cortex A8, Cortex M3
95 v6_M = 11, // e.g. Cortex M1
96 v6S_M = 12, // v6_M with the System extensions
97 v7E_M = 13, // v7_M with DSP extensions
101 enum CPUArchProfile { // (=7), uleb128
102 Not_Applicable = 0, // pre v7, or cross-profile code
103 ApplicationProfile = (0x41), // 'A' (e.g. for Cortex A8)
104 RealTimeProfile = (0x52), // 'R' (e.g. for Cortex R4)
105 MicroControllerProfile = (0x4D), // 'M' (e.g. for Cortex M3)
106 SystemProfile = (0x53) // 'S' Application or real-time profile
109 // The following have a lot of common use cases
111 //ARMISAUse (=8), uleb128 and THUMBISAUse (=9), uleb128
117 // FP_arch (=10), uleb128 (formerly Tag_VFP_arch = 10)
118 AllowFPv2 = 2, // v2 FP ISA permitted (implies use of the v1 FP ISA)
119 AllowFPv3A = 3, // v3 FP ISA permitted (implies use of the v2 FP ISA)
120 AllowFPv3B = 4, // v3 FP ISA permitted, but only D0-D15, S0-S31
121 AllowFPv4A = 5, // v4 FP ISA permitted (implies use of v3 FP ISA)
122 AllowFPv4B = 6, // v4 FP ISA was permitted, but only D0-D15, S0-S31
123 AllowV8FP = 7, // ARMv8-A FP ISA permitted
124 AllowV8FPB = 8 // ARMv8-A FP ISA permitted, but only D0-D15, S0-D31
128 // Tag_THUMB_ISA_use, (=9), uleb128
129 AllowThumb32 = 2 // 32-bit Thumb (implies 16-bit instructions)
133 // Tag_WMMX_arch, (=11), uleb128
134 AllowWMMXv1 = 1, // The user permitted this entity to use WMMX v1
135 AllowWMMXv2 = 2 // The user permitted this entity to use WMMX v2
139 // Tag_ABI_FP_denormal, (=20), uleb128
140 MightFlushToZero = 0, // Denormal numbers might be flushed to (+) zero
141 IEEE754Denormal = 1 , // Depends on IEEE 754 denormal numbers
142 PreserveFPSign = 2 // Sign when flushed-to-zero is preserved
146 // Tag_ABI_FP_number_model, (=23), uleb128
147 AllowNormal = 1, // Use IEEE 754 format normal numbers only
148 AllowRTABI = 2, // numbers, infinities, and one quiet NaN (see [RTABI])
149 AllowIEE754 = 3 // this code to use all the IEEE 754-defined FP encodings
153 // Tag_ABI_FP_rounding, (=19), uleb128
154 FPRoundingNearest = 0, // Use the IEEE 754 round to nearest rounding mode
155 FPRoundingRuntime = 1 // Choose the IEEE 754 rounding mode at run time
159 // Tag_DIV_use, (=44), uleb128
160 AllowDIVThumb = 0, // Allow SDIV, UDIV on Thumb ISA, e.g. Cortex R4 or M3
161 NotAllowedDIV = 1, // Disallow SDIV and UDIV
162 AllowDIVv7a = 2 // Allow SDIV, UDIV on v7-a with integer div extension
166 // Tag_Virtualization_use, (=42), uleb128
167 TrustZone = 1, // Use of the TrustZone extension was permitted
168 VirtExts = 2, // Use of virtualization extensions (HVC, ERET) permitted
169 TrustZoneVirtExts = 3 // TrustZone and virtualization extensions permitted
173 // Tag_PCS_config, (=13), uleb128
174 PCS_none = 0, // No standard configuration used, or no information recorded
175 PCS_bare = 1, // Bare platform configuration
176 PCS_linux = 2, // Linux application configuration
177 PCS_linux_dso = 3, // Linux DSO configuration
178 PCS_palm_2004 = 4, // Palm OS 2004 configuration
179 PCS_palm_future = 5, // Reserved to future Palm OS configuration
180 PCS_symbian_2004 = 6, // Symbian OS 2004 configuration
181 PCS_symbian_future = 7 // Reserved to future Symbian OS configuration
185 // Tag_ABI_PCS_R9_use, (=14), uleb128
186 PCS_R9_normal = 0, // R9 used as V6 (just another callee-saved register,
187 // implied by omitting the tag)
188 PCS_R9_SB = 1, // R9 used as SB, a global Static Base register
189 PCS_R9_TLS = 2, // R9 used as a Thread Local Storage (TLS) pointer
190 PCS_R9_none = 3 // R9 not used at all by code associated with
191 // the attributed entity.
195 // Tag_ABI_PCS_RW_data, (=15), uleb128
196 PCS_RW_data_abs = 0, // RW static data permitted to be addressed absolutely
197 PCS_RW_data_pcrel = 1, // RW static data was only permitted to be
198 // addressed PC-relative.
199 PCS_RW_data_sbrel = 2, // RW static data was only permitted to be addressed
201 PCS_RW_data_none = 3 // No permission to use RW static data
205 // Tag_ABI_PCS_RO_data, (=16), uleb128
206 PCS_RO_data_abs = 0, // RO static data permitted to be addressed absolutely
207 PCS_RO_data_pcrel = 1, // RO static data was only permitted to be
208 // addressed PC-relative.
209 PCS_RO_data_none = 2 // No permission to use RO static data
213 // Tag_ABI_PCS_GOT_use, (=17), uleb128
214 PCS_GOT_none = 0, // No permission to import static data
215 PCS_GOT_direct = 1, // Permission to address imported data directly
216 PCS_GOT_indirect = 2 // The user permitted this entity to address imported
217 // data indirectly (e.g. via a GOT)
221 // Tag_ABI_PCS_wchar_t, (=18), uleb128
222 PCS_wchar_t_disallowed = 0, // The user prohibited the use of wchar_t
223 PCS_wchar_t_2 = 2, // The user intended the size of wchar_t to be 2
224 PCS_wchar_t_4 = 4 // The user intended the size of wchar_t to be 4
228 // Tag_ABI_enum_size, (=26), uleb128
229 PCS_enum_size = 1, // Enum values occupy the smallest container big enough
230 // to hold all their values.
231 PCS_enum_size_32 = 2, // The user intended Enum containers to be 32-bit
232 PCS_enum_size_abi32 = 3 // The user intended that every enumeration visible
233 // across an ABI-complying interface contains a value needing 32 bits to
234 // encode it; other enums can be containerized.
238 // Tag_ABI_align_needed, (=24), uleb128
239 PCS_Align_needed_disallowed = 0, // The user did not permit code to depend
240 // the alignment of 8-byte data or data with extended (>8-byte) alignment.
241 PCS_Align_needed_8 = 1, // Code was permitted to depend on the 8-byte
242 // alignment of 8-byte data items.
243 PCS_Align_needed_4 = 2, // Code was permitted to depend on the 4-byte
244 // alignment of 8-byte data items.
245 PCS_Align_needed_res = 3 // Reserved
246 // OR: n (in 4..12) Code was permitted to depend on the 8-byte alignment of
247 // 8-byte data items and the alignment of data items having up to 2^n byte
248 // extended alignment.
252 // Tag_ABI_align_preserved, (=25), uleb128
253 PCS_Align_preserved_none = 0, // The user did not require code to preserve
254 // 8-byte alignment of 8-byte data objects.
255 PCS_Align_preserved_8 = 1, // Code was required to preserve 8-byte alignment
256 // of 8-byte data objects.
257 PCS_Align_preserved_8sp = 2, // Code was required to preserve 8-byte
258 // alignment of 8-byte data objects and to ensure (SP MOD 8) = 0 at all
259 // instruction boundaries (not just at function calls).
260 PCS_Align_preserved_res = 3 // Reserved
261 // OR: n (in 4..12) Code was required to preserve the alignments of case 2
262 // and the alignment of data items having up to 2^n byte extended alignment
266 // Tag_ABI_HardFP_use, (=27), uleb128
267 HardFPImplied = 0, // FP use should be implied by Tag_FP_arch
268 HardFP_SP_VFP = 1, // Use only SP FP instructions
269 HardFP_Reserved = 2, // Reserved
270 HardFP_ImpliedDup = 3 // Deprecated duplicate of the default HardFPImplied
274 // Tag_ABI_VFP_args, (=28), uleb128
275 VFPArgs_base = 0, // FP parameter/result passing using AAPCS, base variant
276 VFPArgs_VFP = 1, // FP parameter/result passing using AAPCS, VFP variant
277 VFPArgs_toolchain = 2, // FP parameter/result passing to conform to tool
278 // chain-specific conventions
279 VFPArgs_baseVFP = 3 // FP parameter/result passing using both base and VFP
280 //variants. Did not permit non-variadic functions to pass FP params/results.
283 /// Contains build ARM aeabi attribute values.
284 class ARMGenericBuildAttrInfo {
286 ARMGenericBuildAttrInfo()
289 CPUArch Tag_CPU_arch;
290 CPUArchProfile Tag_CPU_arch_profile;
291 std::string Tag_CPU_raw_name;
292 std::string Tag_CPU_name;
293 unsigned Tag_ARM_ISA_use;
294 unsigned Tag_THUMB_ISA_use;
295 unsigned Tag_FP_arch;
296 unsigned Tag_WMMX_arch;
297 unsigned Tag_Advanced_SIMD_arch;
298 unsigned Tag_FP_HP_extension;
299 unsigned Tag_CPU_unaligned_access;
300 unsigned Tag_MPextension_use;
301 unsigned Tag_DIV_use;
302 unsigned Tag_T2EE_use;
303 unsigned Tag_Virtualization_use;
304 unsigned Tag_ABI_optimization_goals;
305 unsigned Tag_ABI_FP_optimization_goals;
308 unsigned Tag_PCS_config;
309 unsigned Tag_ABI_PCS_R9_use;
310 unsigned Tag_ABI_PCS_RW_data;
311 unsigned Tag_ABI_PCS_RO_data;
312 unsigned Tag_ABI_PCS_GOT_use;
313 unsigned Tag_ABI_PCS_wchar_t;
314 unsigned Tag_ABI_enum_size;
315 unsigned Tag_ABI_align8_needed;
316 unsigned Tag_ABI_align8_preserved;
319 unsigned Tag_ABI_FP_rounding;
320 unsigned Tag_ABI_FP_denormal;
321 unsigned Tag_ABI_FP_number_model;
322 unsigned Tag_ABI_FP_exceptions;
323 unsigned Tag_ABI_FP_user_exceptions;
324 unsigned Tag_ABI_HardFP_use;
325 unsigned Tag_ABI_VFP_args;
331 /// Indicates whether this instance contains valid or default values.
332 bool isValid() { return Valid; }
333 void setValid(bool v) { Valid = v; }
339 #endif // LLVM_OBJECT_ELF_ARM_H