1/* Save and set current context.
2 Copyright (C) 2009-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sysdep.h>
20#include <sys/asm.h>
21#include <sys/fpregdef.h>
22#include <sys/regdef.h>
23
24#include "ucontext_i.h"
25
26/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
27
28 .text
29 .set nomips16
30LOCALSZ = 0
31ARGSZ = 0
32MASK = 0x00000000
33#ifdef __PIC__
34LOCALSZ = 1 /* save gp */
35#endif
36#if _MIPS_SIM != _ABIO32
37ARGSZ = 1 /* save a1 */
38# ifdef __PIC__
39MASK = 0x10000000
40# endif
41#endif
42FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
43GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
44#if _MIPS_SIM != _ABIO32
45A1OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */
46#else
47A1OFF = FRAMESZ + (1 * SZREG) /* caller-allocated */
48#endif
49MCONTEXT_GREGSZ = 8
50#if _MIPS_SIM == _ABIO32 && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
51MCONTEXT_GREGOFF = 4
52#else
53MCONTEXT_GREGOFF = 0
54#endif
55
56NESTED (__swapcontext, FRAMESZ, ra)
57 .mask MASK, -(ARGSZ * SZREG)
58 .fmask 0x00000000, 0
59
60#ifdef __PIC__
61 SETUP_GP
62
63 move a2, sp
64# define _SP a2
65
66# if _MIPS_SIM != _ABIO32
67 move a3, gp
68# define _GP a3
69# endif
70
71 PTR_ADDIU sp, -FRAMESZ
72 cfi_adjust_cfa_offset (FRAMESZ)
73 SETUP_GP64_STACK (GPOFF, __swapcontext)
74 SAVE_GP (GPOFF)
75
76#else /* ! __PIC__ */
77# define _SP sp
78# define _GP gp
79
80#endif /* ! __PIC__ */
81
82#ifdef PROF
83 .set noat
84 move AT, ra
85 jal _mcount
86 .set at
87#endif
88
89 REG_S s0, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
90 REG_S s1, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
91 REG_S s2, (MCONTEXT_GREGOFF + 18 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
92 REG_S s3, (MCONTEXT_GREGOFF + 19 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
93 REG_S s4, (MCONTEXT_GREGOFF + 20 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
94 REG_S s5, (MCONTEXT_GREGOFF + 21 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
95 REG_S s6, (MCONTEXT_GREGOFF + 22 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
96 REG_S s7, (MCONTEXT_GREGOFF + 23 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
97#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
98 REG_S _GP, (MCONTEXT_GREGOFF + 28 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
99#endif
100 REG_S _SP, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
101 REG_S fp, (MCONTEXT_GREGOFF + 30 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
102 REG_S ra, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
103 REG_S ra, (MCONTEXT_GREGOFF + MCONTEXT_PC)(a0)
104
105#ifdef __mips_hard_float
106# if _MIPS_SIM == _ABI64
107 s.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0)
108 s.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0)
109 s.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0)
110 s.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0)
111 s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
112 s.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0)
113 s.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0)
114 s.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0)
115
116# else /* _MIPS_SIM != _ABI64 */
117 s.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0)
118 s.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0)
119 s.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0)
120 s.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0)
121 s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
122 s.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0)
123
124# endif /* _MIPS_SIM != _ABI64 */
125
126 cfc1 v1, fcr31
127 sw v1, MCONTEXT_FPC_CSR(a0)
128#endif /* __mips_hard_float */
129
130 REG_S a1, A1OFF(sp)
131
132/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
133 li a3, _NSIG8
134 PTR_ADDU a2, a0, UCONTEXT_SIGMASK
135 PTR_ADDU a1, a1, UCONTEXT_SIGMASK
136 li a0, SIG_SETMASK
137
138 li v0, SYS_ify (rt_sigprocmask)
139 syscall
140 bnez a3, 99f
141
142 REG_L v0, A1OFF(sp)
143
144#ifdef __mips_hard_float
145# if _MIPS_SIM == _ABI64
146 l.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0)
147 l.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0)
148 l.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0)
149 l.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0)
150 l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
151 l.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0)
152 l.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0)
153 l.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0)
154
155# else /* _MIPS_SIM != _ABI64 */
156 l.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0)
157 l.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0)
158 l.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0)
159 l.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0)
160 l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
161 l.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0)
162
163# endif /* _MIPS_SIM != _ABI64 */
164
165 lw v1, MCONTEXT_FPC_CSR(v0)
166 ctc1 v1, fcr31
167#endif /* __mips_hard_float */
168
169 /* Note the contents of argument registers will be random
170 unless makecontext() has been called. */
171 REG_L a0, (MCONTEXT_GREGOFF + 4 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
172 REG_L a1, (MCONTEXT_GREGOFF + 5 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
173 REG_L a2, (MCONTEXT_GREGOFF + 6 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
174 REG_L a3, (MCONTEXT_GREGOFF + 7 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
175#if _MIPS_SIM != _ABIO32
176 REG_L a4, (MCONTEXT_GREGOFF + 8 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
177 REG_L a5, (MCONTEXT_GREGOFF + 9 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
178 REG_L a6, (MCONTEXT_GREGOFF + 10 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
179 REG_L a7, (MCONTEXT_GREGOFF + 11 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
180#endif
181
182 REG_L s0, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
183 REG_L s1, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
184 REG_L s2, (MCONTEXT_GREGOFF + 18 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
185 REG_L s3, (MCONTEXT_GREGOFF + 19 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
186 REG_L s4, (MCONTEXT_GREGOFF + 20 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
187 REG_L s5, (MCONTEXT_GREGOFF + 21 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
188 REG_L s6, (MCONTEXT_GREGOFF + 22 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
189 REG_L s7, (MCONTEXT_GREGOFF + 23 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
190#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
191 REG_L gp, (MCONTEXT_GREGOFF + 28 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
192#endif
193 REG_L sp, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
194 REG_L fp, (MCONTEXT_GREGOFF + 30 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
195 REG_L ra, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
196 REG_L t9, (MCONTEXT_GREGOFF + MCONTEXT_PC)(v0)
197
198 move v0, zero
199 jr t9
200
20199:
202#ifdef __PIC__
203 PTR_LA t9, JUMPTARGET (__syscall_error)
204 RESTORE_GP64_STACK
205 PTR_ADDIU sp, FRAMESZ
206 cfi_adjust_cfa_offset (-FRAMESZ)
207 jr t9
208
209#else /* ! __PIC__ */
210
211 j JUMPTARGET (__syscall_error)
212#endif /* ! __PIC__ */
213PSEUDO_END (__swapcontext)
214
215weak_alias (__swapcontext, swapcontext)
216

source code of glibc/sysdeps/unix/sysv/linux/mips/swapcontext.S