1 /* $NetBSD: mcontext.h,v 1.21 2018/10/12 01:28:58 ryo Exp $ */ 2 3 /*- 4 * Copyright (c) 2001, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein and by Jason R. Thorpe of Wasabi Systems, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _ARM_MCONTEXT_H_ 33 #define _ARM_MCONTEXT_H_ 34 35 #include <sys/stdint.h> 36 37 /* 38 * General register state 39 */ 40 #if defined(__aarch64__) 41 #define _NGREG 35 /* GR0-30, SP, PC, APSR, TPIDR */ 42 #define _NGREG32 17 43 typedef __uint64_t __greg_t; 44 typedef unsigned int __greg32_t; 45 46 typedef __greg32_t __gregset32_t[_NGREG32]; 47 #elif defined(__arm__) 48 #define _NGREG 17 49 typedef unsigned int __greg_t; 50 #endif 51 52 typedef __greg_t __gregset_t[_NGREG]; 53 54 #define _REG_R0 0 55 #define _REG_R1 1 56 #define _REG_R2 2 57 #define _REG_R3 3 58 #define _REG_R4 4 59 #define _REG_R5 5 60 #define _REG_R6 6 61 #define _REG_R7 7 62 #define _REG_R8 8 63 #define _REG_R9 9 64 #define _REG_R10 10 65 #define _REG_R11 11 66 #define _REG_R12 12 67 #define _REG_R13 13 68 #define _REG_R14 14 69 #define _REG_R15 15 70 #define _REG_CPSR 16 71 72 #define _REG_X0 0 73 #define _REG_X1 1 74 #define _REG_X2 2 75 #define _REG_X3 3 76 #define _REG_X4 4 77 #define _REG_X5 5 78 #define _REG_X6 6 79 #define _REG_X7 7 80 #define _REG_X8 8 81 #define _REG_X9 9 82 #define _REG_X10 10 83 #define _REG_X11 11 84 #define _REG_X12 12 85 #define _REG_X13 13 86 #define _REG_X14 14 87 #define _REG_X15 15 88 #define _REG_X16 16 89 #define _REG_X17 17 90 #define _REG_X18 18 91 #define _REG_X19 19 92 #define _REG_X20 20 93 #define _REG_X21 21 94 #define _REG_X22 22 95 #define _REG_X23 23 96 #define _REG_X24 24 97 #define _REG_X25 25 98 #define _REG_X26 26 99 #define _REG_X27 27 100 #define _REG_X28 28 101 #define _REG_X29 29 102 #define _REG_X30 30 103 #define _REG_X31 31 104 #define _REG_ELR 32 105 #define _REG_SPSR 33 106 #define _REG_TPIDR 34 107 108 /* Convenience synonyms */ 109 110 #if defined(__aarch64__) 111 #define _REG_RV _REG_X0 112 #define _REG_FP _REG_X29 113 #define _REG_LR _REG_X30 114 #define _REG_SP _REG_X31 115 #define _REG_PC _REG_ELR 116 #elif defined(__arm__) 117 #define _REG_RV _REG_R0 118 #define _REG_FP _REG_R11 119 #define _REG_SP _REG_R13 120 #define _REG_LR _REG_R14 121 #define _REG_PC _REG_R15 122 #endif 123 124 /* 125 * Floating point register state 126 */ 127 #if defined(__aarch64__) 128 129 #define _NFREG 32 /* Number of SIMD registers */ 130 131 typedef struct { 132 union __freg { 133 __uint8_t __b8[16]; 134 __uint16_t __h16[8]; 135 __uint32_t __s32[4]; 136 __uint64_t __d64[2]; 137 __uint128_t __q128[1]; 138 } __qregs[_NFREG] __aligned(16); 139 __uint32_t __fpcr; /* FPCR */ 140 __uint32_t __fpsr; /* FPSR */ 141 } __fregset_t; 142 143 /* Compat structures */ 144 typedef struct { 145 #if 1 /* __ARM_EABI__ is default on aarch64 */ 146 unsigned int __vfp_fpscr; 147 uint64_t __vfp_fstmx[32]; 148 unsigned int __vfp_fpsid; 149 #else 150 unsigned int __vfp_fpscr; 151 unsigned int __vfp_fstmx[33]; 152 unsigned int __vfp_fpsid; 153 #endif 154 } __vfpregset32_t; 155 156 typedef struct { 157 __gregset32_t __gregs; 158 __vfpregset32_t __vfpregs; 159 __greg32_t _mc_tlsbase; 160 __greg32_t _mc_user_tpid; 161 } mcontext32_t; 162 163 typedef struct { 164 __gregset_t __gregs; /* General Purpose Register set */ 165 __fregset_t __fregs; /* FPU/SIMD Register File */ 166 __greg_t __spare[8]; /* future proof */ 167 } mcontext_t; 168 169 #elif defined(__arm__) 170 /* Note: the storage layout of this structure must be identical to ARMFPE! */ 171 typedef struct { 172 unsigned int __fp_fpsr; 173 struct { 174 unsigned int __fp_exponent; 175 unsigned int __fp_mantissa_hi; 176 unsigned int __fp_mantissa_lo; 177 } __fp_fr[8]; 178 } __fpregset_t; 179 180 typedef struct { 181 #ifdef __ARM_EABI__ 182 unsigned int __vfp_fpscr; 183 uint64_t __vfp_fstmx[32]; 184 unsigned int __vfp_fpsid; 185 #else 186 unsigned int __vfp_fpscr; 187 unsigned int __vfp_fstmx[33]; 188 unsigned int __vfp_fpsid; 189 #endif 190 } __vfpregset_t; 191 192 typedef struct { 193 __gregset_t __gregs; 194 union { 195 __fpregset_t __fpregs; 196 __vfpregset_t __vfpregs; 197 } __fpu; 198 __greg_t _mc_tlsbase; 199 __greg_t _mc_user_tpid; 200 } mcontext_t, mcontext32_t; 201 202 203 #define _UC_MACHINE_PAD 1 /* Padding appended to ucontext_t */ 204 205 #ifdef __ARM_EABI__ 206 #define __UCONTEXT_SIZE (256 + 144) 207 #else 208 #define __UCONTEXT_SIZE 256 209 #endif 210 211 #endif 212 213 #if defined(_RTLD_SOURCE) || defined(_LIBC_SOURCE) || \ 214 defined(__LIBPTHREAD_SOURCE__) 215 216 #include <sys/tls.h> 217 218 #if defined(__aarch64__) 219 220 __BEGIN_DECLS 221 static __inline void * 222 __lwp_getprivate_fast(void) 223 { 224 void *__tpidr; 225 __asm __volatile("mrs\t%0, tpidr_el0" : "=r"(__tpidr)); 226 return __tpidr; 227 } 228 __END_DECLS 229 230 #elif defined(__arm__) 231 232 __BEGIN_DECLS 233 static __inline void * 234 __lwp_getprivate_fast(void) 235 { 236 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 237 extern void *_lwp_getprivate(void); 238 void *rv; 239 __asm("mrc p15, 0, %0, c13, c0, 3" : "=r"(rv)); 240 if (__predict_true(rv)) 241 return rv; 242 /* 243 * Some ARM cores are broken and don't raise an undefined fault when an 244 * unrecogized mrc instruction is encountered, but just return zero. 245 * To do deal with that, if we get a zero we (re-)fetch the value using 246 * syscall. 247 */ 248 return _lwp_getprivate(); 249 #else 250 extern void *__aeabi_read_tp(void); 251 return __aeabi_read_tp(); 252 #endif /* !__thumb__ || _ARM_ARCH_T2 */ 253 } 254 __END_DECLS 255 #endif 256 257 #endif /* _RTLD_SOURCE || _LIBC_SOURCE || __LIBPTHREAD_SOURCE__ */ 258 259 /* Machine-dependent uc_flags */ 260 #define _UC_TLSBASE 0x00080000 /* see <sys/ucontext.h> */ 261 262 /* Machine-dependent uc_flags for arm */ 263 #define _UC_ARM_VFP 0x00010000 /* FPU field is VFP */ 264 265 /* used by signal delivery to indicate status of signal stack */ 266 #define _UC_SETSTACK 0x00020000 267 #define _UC_CLRSTACK 0x00040000 268 269 #define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_SP]) 270 #define _UC_MACHINE_FP(uc) ((uc)->uc_mcontext.__gregs[_REG_FP]) 271 #define _UC_MACHINE_PC(uc) ((uc)->uc_mcontext.__gregs[_REG_PC]) 272 #define _UC_MACHINE_INTRV(uc) ((uc)->uc_mcontext.__gregs[_REG_RV]) 273 274 #define _UC_MACHINE_SET_PC(uc, pc) \ 275 _UC_MACHINE_PC(uc) = (pc) 276 277 #if defined(_KERNEL) 278 __BEGIN_DECLS 279 void vfp_getcontext(struct lwp *, mcontext_t *, int *); 280 void vfp_setcontext(struct lwp *, const mcontext_t *); 281 __END_DECLS 282 #endif 283 284 #endif /* !_ARM_MCONTEXT_H_ */ 285