1 /* $NetBSD: mcontext.h,v 1.18 2015/03/24 08:38:29 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 #if defined(__minix)
98 int mc_flags;
99 int mc_magic;
100 #else
101 __greg_t _mc_tlsbase;
102 __greg_t _mc_user_tpid;
103 #endif /* defined(__minix) */
104 } mcontext_t, mcontext32_t;
105
106 /* Machine-dependent uc_flags */
107 #define _UC_ARM_VFP 0x00010000 /* FPU field is VFP */
108
109 /* used by signal delivery to indicate status of signal stack */
110 #define _UC_SETSTACK 0x00020000
111 #define _UC_CLRSTACK 0x00040000
112
113 #define _UC_TLSBASE 0x00080000
114
115 #define _UC_MACHINE_PAD 1 /* Padding appended to ucontext_t */
116
117 #define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_SP])
118 #define _UC_MACHINE_PC(uc) ((uc)->uc_mcontext.__gregs[_REG_PC])
119 #define _UC_MACHINE_INTRV(uc) ((uc)->uc_mcontext.__gregs[_REG_R0])
120
121 #define _UC_MACHINE_SET_PC(uc, pc) _UC_MACHINE_PC(uc) = (pc)
122
123 #if defined(__minix)
124 #define _UC_MACHINE_STACK(uc) ((uc)->uc_mcontext.__gregs[_REG_SP])
125 #define _UC_MACHINE_SET_STACK(uc, sp) _UC_MACHINE_STACK(uc) = (sp)
126
127 #define _UC_MACHINE_FP(uc) ((uc)->uc_mcontext.__gregs[_REG_FP])
128 #define _UC_MACHINE_SET_FP(uc, fp) _UC_MACHINE_FP(uc) = (fp)
129
130 #define _UC_MACHINE_LR(uc) ((uc)->uc_mcontext.__gregs[_REG_LR])
131 #define _UC_MACHINE_SET_LR(uc, lr) _UC_MACHINE_LR(uc) = (lr)
132
133 #define _UC_MACHINE_R0(uc) ((uc)->uc_mcontext.__gregs[_REG_R0])
134 #define _UC_MACHINE_SET_R0(uc, setreg) _UC_MACHINE_R0(uc) = (setreg)
135
136 #define _UC_MACHINE_R1(uc) ((uc)->uc_mcontext.__gregs[_REG_R1])
137 #define _UC_MACHINE_SET_R1(uc, setreg) _UC_MACHINE_R1(uc) = (setreg)
138
139 #define _UC_MACHINE_R2(uc) ((uc)->uc_mcontext.__gregs[_REG_R2])
140 #define _UC_MACHINE_SET_R2(uc, setreg) _UC_MACHINE_R2(uc) = (setreg)
141
142 #define _UC_MACHINE_R3(uc) ((uc)->uc_mcontext.__gregs[_REG_R3])
143 #define _UC_MACHINE_SET_R3(uc, setreg) _UC_MACHINE_R3(uc) = (setreg)
144
145 #define _UC_MACHINE_R4(uc) ((uc)->uc_mcontext.__gregs[_REG_R4])
146 #define _UC_MACHINE_SET_R4(uc, setreg) _UC_MACHINE_R4(uc) = (setreg)
147 #endif /* defined(__minix) */
148
149 #ifdef __ARM_EABI__
150 #define __UCONTEXT_SIZE (256 + 144)
151 #else
152 #define __UCONTEXT_SIZE 256
153 #endif
154
155 __BEGIN_DECLS
156 static __inline void *
__lwp_getprivate_fast(void)157 __lwp_getprivate_fast(void)
158 {
159 #if !defined(__thumb__) || defined(_ARM_ARCH_T2)
160 extern void *_lwp_getprivate(void);
161 void *rv;
162 __asm("mrc p15, 0, %0, c13, c0, 3" : "=r"(rv));
163 if (__predict_true(rv))
164 return rv;
165 /*
166 * Some ARM cores are broken and don't raise an undefined fault when an
167 * unrecogized mrc instruction is encountered, but just return zero.
168 * To do deal with that, if we get a zero we (re-)fetch the value using
169 * syscall.
170 */
171 return _lwp_getprivate();
172 #else
173 extern void *__aeabi_read_tp(void);
174 return __aeabi_read_tp();
175 #endif /* !__thumb__ || _ARM_ARCH_T2 */
176 }
177
178 #if defined(_KERNEL)
179 void vfp_getcontext(struct lwp *, mcontext_t *, int *);
180 void vfp_setcontext(struct lwp *, const mcontext_t *);
181 #endif
182
183 #if defined(__minix)
184 int setmcontext(const mcontext_t *mcp);
185 int getmcontext(mcontext_t *mcp);
186 #define MCF_MAGIC 0xc0ffee
187 #endif /* defined(__minix) */
188 __END_DECLS
189
190 #endif /* !_ARM_MCONTEXT_H_ */
191