1 /* $NetBSD: mcontext.h,v 1.22 2020/10/04 10:34:18 rin Exp $ */
2
3 /*-
4 * Copyright (c) 2001 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.
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 _POWERPC_MCONTEXT_H_
33 #define _POWERPC_MCONTEXT_H_
34
35 /*
36 * Layout of mcontext_t based on the System V Application Binary Interface,
37 * Edition 4.1, PowerPC Processor ABI Supplement - September 1995, and
38 * extended for the AltiVec Register File. Note that due to the increased
39 * alignment requirements of the latter, the offset of mcontext_t within
40 * an ucontext_t is different from System V.
41 */
42
43 #define _NGREG 39 /* GR0-31, CR, LR, SRR0, SRR1, CTR, XER, MQ */
44
45 typedef long __greg_t;
46 typedef __greg_t __gregset_t[_NGREG];
47
48 #define _REG_R0 0
49 #define _REG_R1 1
50 #define _REG_R2 2
51 #define _REG_R3 3
52 #define _REG_R4 4
53 #define _REG_R5 5
54 #define _REG_R6 6
55 #define _REG_R7 7
56 #define _REG_R8 8
57 #define _REG_R9 9
58 #define _REG_R10 10
59 #define _REG_R11 11
60 #define _REG_R12 12
61 #define _REG_R13 13
62 #define _REG_R14 14
63 #define _REG_R15 15
64 #define _REG_R16 16
65 #define _REG_R17 17
66 #define _REG_R18 18
67 #define _REG_R19 19
68 #define _REG_R20 20
69 #define _REG_R21 21
70 #define _REG_R22 22
71 #define _REG_R23 23
72 #define _REG_R24 24
73 #define _REG_R25 25
74 #define _REG_R26 26
75 #define _REG_R27 27
76 #define _REG_R28 28
77 #define _REG_R29 29
78 #define _REG_R30 30
79 #define _REG_R31 31
80 #define _REG_CR 32 /* Condition Register */
81 #define _REG_LR 33 /* Link Register */
82 #define _REG_PC 34 /* PC (copy of SRR0) */
83 #define _REG_MSR 35 /* MSR (copy of SRR1) */
84 #define _REG_CTR 36 /* Count Register */
85 #define _REG_XER 37 /* Integer Exception Register */
86 #define _REG_MQ 38 /* MQ Register (POWER only) */
87
88 typedef struct {
89 #ifdef _KERNEL
90 unsigned long long __fpu_regs[32]; /* FP0-31 */
91 #else
92 double __fpu_regs[32]; /* FP0-31 */
93 #endif
94 unsigned int __fpu_fpscr; /* FP Status and Control Register */
95 unsigned int __fpu_valid; /* Set together with _UC_FPU */
96 } __fpregset_t;
97
98 #define _NVR 32 /* Number of Vector registers */
99
100 typedef struct {
101 union __vr {
102 unsigned char __vr8[16];
103 unsigned short __vr16[8];
104 unsigned int __vr32[4];
105 unsigned char __spe8[8];
106 unsigned short __spe16[4];
107 unsigned int __spe32[2];
108 } __vrs[_NVR] __aligned(16);
109 unsigned int __vscr; /* VSCR */
110 unsigned int __vrsave; /* VRSAVE */
111 } __vrf_t;
112
113 typedef struct {
114 __gregset_t __gregs; /* General Purpose Register set */
115 __fpregset_t __fpregs; /* Floating Point Register set */
116 __vrf_t __vrf; /* Vector Register File */
117 } mcontext_t;
118
119 #if defined(_LP64)
120 typedef int __greg32_t;
121 typedef __greg32_t __gregset32_t[_NGREG];
122
123 typedef struct {
124 __gregset32_t __gregs; /* General Purpose Register set */
125 __fpregset_t __fpregs; /* Floating Point Register set */
126 __vrf_t __vrf; /* Vector Register File */
127 } mcontext32_t;
128 #endif
129
130 /* Machine-dependent uc_flags */
131 #define _UC_POWERPC_VEC 0x00010000 /* Vector Register File valid */
132 #define _UC_POWERPC_SPE 0x00020000 /* Vector Register File valid */
133 #define _UC_TLSBASE 0x00080000 /* thread context valid in R2 */
134 #define _UC_SETSTACK 0x00100000
135 #define _UC_CLRSTACK 0x00200000
136
137 #define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_R1])
138 #define _UC_MACHINE_FP(uc) ((uc)->uc_mcontext.__gregs[_REG_R31])
139 #define _UC_MACHINE_PC(uc) ((uc)->uc_mcontext.__gregs[_REG_PC])
140 #define _UC_MACHINE_INTRV(uc) ((uc)->uc_mcontext.__gregs[_REG_R3])
141
142 #define _UC_MACHINE_SET_PC(uc, pc) _UC_MACHINE_PC(uc) = (pc)
143
144 #if defined(_RTLD_SOURCE) || defined(_LIBC_SOURCE) || defined(__LIBPTHREAD_SOURCE__)
145 #include <sys/tls.h>
146
147 /*
148 * On PowerPC, since displacements are signed 16-bit values, the TCB Pointer
149 * is biased by 0x7000 + sizeof(tcb) so that first thread datum can be
150 * addressed by -28672 thereby leaving 60KB available for use as thread data.
151 */
152 #define TLS_TP_OFFSET 0x7000
153 #define TLS_DTV_OFFSET 0x8000
154 __CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000);
155
156 __BEGIN_DECLS
157
158 static __inline void *
__lwp_gettcb_fast(void)159 __lwp_gettcb_fast(void)
160 {
161 void *__tcb;
162
163 __asm __volatile(
164 "addi %[__tcb],%%r2,%[__offset]"
165 : [__tcb] "=r" (__tcb)
166 : [__offset] "n" (-(TLS_TP_OFFSET + sizeof(struct tls_tcb))));
167
168 return __tcb;
169 }
170
171 void _lwp_setprivate(void *);
172
173 static __inline void
__lwp_settcb(void * __tcb)174 __lwp_settcb(void *__tcb)
175 {
176 __tcb = (uint8_t *)__tcb + TLS_TP_OFFSET + sizeof(struct tls_tcb);
177
178 __asm __volatile(
179 "mr %%r2,%[__tcb]"
180 :
181 : [__tcb] "r" (__tcb));
182
183 _lwp_setprivate(__tcb);
184 }
185 __END_DECLS
186 #endif /* _RTLD_SOURCE || _LIBC_SOURCE || __LIBPTHREAD_SOURCE__ */
187
188 #endif /* !_POWERPC_MCONTEXT_H_ */
189