1/* Save 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 getcontext (ucontext_t *ucp) */
27
28 .text
29 .set nomips16
30LOCALSZ = 0
31MASK = 0x00000000
32#ifdef __PIC__
33LOCALSZ = 1 /* save gp */
34# if _MIPS_SIM != _ABIO32
35MASK = 0x10000000
36# endif
37#endif
38FRAMESZ = ((LOCALSZ * SZREG) + ALSZ) & ALMASK
39GPOFF = FRAMESZ - (1 * SZREG)
40MCONTEXT_GREGSZ = 8
41#if _MIPS_SIM == _ABIO32 && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
42MCONTEXT_GREGOFF = 4
43#else
44MCONTEXT_GREGOFF = 0
45#endif
46
47NESTED (__getcontext, FRAMESZ, ra)
48 .mask MASK, 0
49 .fmask 0x00000000, 0
50
51#ifdef __PIC__
52 SETUP_GP
53
54 move a2, sp
55# define _SP a2
56
57# if _MIPS_SIM != _ABIO32
58 move a3, gp
59# define _GP a3
60# endif
61
62 PTR_ADDIU sp, -FRAMESZ
63 cfi_adjust_cfa_offset (FRAMESZ)
64 SETUP_GP64_STACK (GPOFF, __getcontext)
65 SAVE_GP (GPOFF)
66
67#else /* ! __PIC__ */
68# define _SP sp
69# define _GP gp
70
71#endif /* ! __PIC__ */
72
73#ifdef PROF
74 .set noat
75 move AT, ra
76 jal _mcount
77 .set at
78#endif
79
80 REG_S s0, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
81 REG_S s1, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
82 REG_S s2, (MCONTEXT_GREGOFF + 18 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
83 REG_S s3, (MCONTEXT_GREGOFF + 19 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
84 REG_S s4, (MCONTEXT_GREGOFF + 20 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
85 REG_S s5, (MCONTEXT_GREGOFF + 21 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
86 REG_S s6, (MCONTEXT_GREGOFF + 22 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
87 REG_S s7, (MCONTEXT_GREGOFF + 23 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
88#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
89 REG_S _GP, (MCONTEXT_GREGOFF + 28 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
90#endif
91 REG_S _SP, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
92 REG_S fp, (MCONTEXT_GREGOFF + 30 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
93 REG_S ra, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
94 REG_S ra, (MCONTEXT_GREGOFF + MCONTEXT_PC)(a0)
95
96#ifdef __mips_hard_float
97# if _MIPS_SIM == _ABI64
98 s.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0)
99 s.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0)
100 s.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0)
101 s.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0)
102 s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
103 s.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0)
104 s.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0)
105 s.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0)
106
107# else /* _MIPS_SIM != _ABI64 */
108 s.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0)
109 s.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0)
110 s.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0)
111 s.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0)
112 s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
113 s.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0)
114
115# endif /* _MIPS_SIM != _ABI64 */
116
117 cfc1 v1, fcr31
118 sw v1, MCONTEXT_FPC_CSR(a0)
119#endif /* __mips_hard_float */
120
121/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
122 li a3, _NSIG8
123 PTR_ADDU a2, a0, UCONTEXT_SIGMASK
124 move a1, zero
125 li a0, SIG_BLOCK
126
127 li v0, SYS_ify (rt_sigprocmask)
128 syscall
129 bnez a3, 99f
130 cfi_remember_state
131
132#ifdef __PIC__
133 RESTORE_GP64_STACK
134 PTR_ADDIU sp, FRAMESZ
135 cfi_adjust_cfa_offset (-FRAMESZ)
136#endif
137 move v0, zero
138 jr ra
139
14099:
141 cfi_restore_state
142#ifdef __PIC__
143 PTR_LA t9, JUMPTARGET (__syscall_error)
144 RESTORE_GP64_STACK
145 PTR_ADDIU sp, FRAMESZ
146 cfi_adjust_cfa_offset (-FRAMESZ)
147 jr t9
148
149#else /* ! __PIC__ */
150
151 j JUMPTARGET (__syscall_error)
152#endif /* ! __PIC__ */
153PSEUDO_END (__getcontext)
154
155weak_alias (__getcontext, getcontext)
156

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