1 /* $NetBSD: mcontext.h,v 1.16 2013/08/15 22:34:59 matt 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 * General register state 38 */ 39 #define _NGREG 17 40 typedef unsigned int __greg_t; 41 typedef __greg_t __gregset_t[_NGREG]; 42 43 #define _REG_R0 0 44 #define _REG_R1 1 45 #define _REG_R2 2 46 #define _REG_R3 3 47 #define _REG_R4 4 48 #define _REG_R5 5 49 #define _REG_R6 6 50 #define _REG_R7 7 51 #define _REG_R8 8 52 #define _REG_R9 9 53 #define _REG_R10 10 54 #define _REG_R11 11 55 #define _REG_R12 12 56 #define _REG_R13 13 57 #define _REG_R14 14 58 #define _REG_R15 15 59 #define _REG_CPSR 16 60 /* Convenience synonyms */ 61 #define _REG_FP _REG_R11 62 #define _REG_SP _REG_R13 63 #define _REG_LR _REG_R14 64 #define _REG_PC _REG_R15 65 66 /* 67 * Floating point register state 68 */ 69 /* Note: the storage layout of this structure must be identical to ARMFPE! */ 70 typedef struct { 71 unsigned int __fp_fpsr; 72 struct { 73 unsigned int __fp_exponent; 74 unsigned int __fp_mantissa_hi; 75 unsigned int __fp_mantissa_lo; 76 } __fp_fr[8]; 77 } __fpregset_t; 78 79 typedef struct { 80 #ifdef __ARM_EABI__ 81 unsigned int __vfp_fpscr; 82 uint64_t __vfp_fstmx[32]; 83 unsigned int __vfp_fpsid; 84 #else 85 unsigned int __vfp_fpscr; 86 unsigned int __vfp_fstmx[33]; 87 unsigned int __vfp_fpsid; 88 #endif 89 } __vfpregset_t; 90 91 typedef struct { 92 __gregset_t __gregs; 93 union { 94 __fpregset_t __fpregs; 95 __vfpregset_t __vfpregs; 96 } __fpu; 97 __greg_t _mc_tlsbase; 98 #if defined(__minix) 99 int mc_flags; 100 int mc_magic; 101 #endif /* defined(__minix) */ 102 } mcontext_t, mcontext32_t; 103 104 /* Machine-dependent uc_flags */ 105 #define _UC_ARM_VFP 0x00010000 /* FPU field is VFP */ 106 107 /* used by signal delivery to indicate status of signal stack */ 108 #define _UC_SETSTACK 0x00020000 109 #define _UC_CLRSTACK 0x00040000 110 111 #define _UC_TLSBASE 0x00080000 112 113 #define _UC_MACHINE_PAD 2 /* Padding appended to ucontext_t */ 114 115 #define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_SP]) 116 #define _UC_MACHINE_PC(uc) ((uc)->uc_mcontext.__gregs[_REG_PC]) 117 #define _UC_MACHINE_INTRV(uc) ((uc)->uc_mcontext.__gregs[_REG_R0]) 118 119 #define _UC_MACHINE_SET_PC(uc, pc) _UC_MACHINE_PC(uc) = (pc) 120 121 #if defined(__minix) 122 #define _UC_MACHINE_STACK(uc) ((uc)->uc_mcontext.__gregs[_REG_SP]) 123 #define _UC_MACHINE_SET_STACK(uc, sp) _UC_MACHINE_STACK(uc) = (sp) 124 125 #define _UC_MACHINE_FP(uc) ((uc)->uc_mcontext.__gregs[_REG_FP]) 126 #define _UC_MACHINE_SET_FP(uc, fp) _UC_MACHINE_FP(uc) = (fp) 127 128 #define _UC_MACHINE_LR(uc) ((uc)->uc_mcontext.__gregs[_REG_LR]) 129 #define _UC_MACHINE_SET_LR(uc, lr) _UC_MACHINE_LR(uc) = (lr) 130 131 #define _UC_MACHINE_R0(uc) ((uc)->uc_mcontext.__gregs[_REG_R0]) 132 #define _UC_MACHINE_SET_R0(uc, setreg) _UC_MACHINE_R0(uc) = (setreg) 133 134 #define _UC_MACHINE_R1(uc) ((uc)->uc_mcontext.__gregs[_REG_R1]) 135 #define _UC_MACHINE_SET_R1(uc, setreg) _UC_MACHINE_R1(uc) = (setreg) 136 137 #define _UC_MACHINE_R2(uc) ((uc)->uc_mcontext.__gregs[_REG_R2]) 138 #define _UC_MACHINE_SET_R2(uc, setreg) _UC_MACHINE_R2(uc) = (setreg) 139 140 #define _UC_MACHINE_R3(uc) ((uc)->uc_mcontext.__gregs[_REG_R3]) 141 #define _UC_MACHINE_SET_R3(uc, setreg) _UC_MACHINE_R3(uc) = (setreg) 142 143 #define _UC_MACHINE_R4(uc) ((uc)->uc_mcontext.__gregs[_REG_R4]) 144 #define _UC_MACHINE_SET_R4(uc, setreg) _UC_MACHINE_R4(uc) = (setreg) 145 #endif /* defined(__minix) */ 146 147 #ifdef __ARM_EABI__ 148 #define __UCONTEXT_SIZE (256 + 144) 149 #else 150 #define __UCONTEXT_SIZE 256 151 #endif 152 153 static __inline void * 154 __lwp_getprivate_fast(void) 155 { 156 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 157 extern void *_lwp_getprivate(void); 158 void *rv; 159 __asm("mrc p15, 0, %0, c13, c0, 3" : "=r"(rv)); 160 if (__predict_true(rv)) 161 return rv; 162 /* 163 * Some ARM cores are broken and don't raise an undefined fault when an 164 * unrecogized mrc instruction is encountered, but just return zero. 165 * To do deal with that, if we get a zero we (re-)fetch the value using 166 * syscall. 167 */ 168 return _lwp_getprivate(); 169 #else 170 extern void *__aeabi_read_tp(void); 171 return __aeabi_read_tp(); 172 #endif /* !__thumb__ || _ARM_ARCH_T2 */ 173 } 174 175 #if defined(_KERNEL) 176 void vfp_getcontext(struct lwp *, mcontext_t *, int *); 177 void vfp_setcontext(struct lwp *, const mcontext_t *); 178 #endif 179 180 #if defined(__minix) 181 int setmcontext(const mcontext_t *mcp); 182 int getmcontext(mcontext_t *mcp); 183 #define MCF_MAGIC 0xc0ffee 184 #endif /* defined(__minix) */ 185 186 #endif /* !_ARM_MCONTEXT_H_ */ 187