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ff347533 | 1 | /* Set current context. |
04277e02 | 2 | Copyright (C) 2009-2019 Free Software Foundation, Inc. |
ff347533 JM |
3 | This file is part of the GNU C Library. |
4 | Contributed by Maciej W. Rozycki <macro@codesourcery.com>. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
ab84e3ff PE |
17 | License along with the GNU C Library. If not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
ff347533 JM |
19 | |
20 | #include <sysdep.h> | |
21 | #include <sys/asm.h> | |
22 | #include <sys/fpregdef.h> | |
23 | #include <sys/regdef.h> | |
24 | ||
25 | #include "ucontext_i.h" | |
26 | ||
27 | /* int setcontext (const ucontext_t *ucp) */ | |
28 | ||
29 | .text | |
43301bd3 | 30 | .set nomips16 |
ff347533 JM |
31 | LOCALSZ = 0 |
32 | ARGSZ = 0 | |
33 | MASK = 0x00000000 | |
34 | #ifdef __PIC__ | |
35 | LOCALSZ = 1 /* save gp */ | |
36 | #endif | |
37 | #if _MIPS_SIM != _ABIO32 | |
38 | ARGSZ = 1 /* save a0 */ | |
39 | # ifdef __PIC__ | |
40 | MASK = 0x10000000 | |
41 | # endif | |
42 | #endif | |
43 | FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK | |
44 | GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG) | |
45 | #if _MIPS_SIM != _ABIO32 | |
46 | A0OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */ | |
47 | #else | |
48 | A0OFF = FRAMESZ + (0 * SZREG) /* caller-allocated */ | |
49 | #endif | |
b309f058 GC |
50 | MCONTEXT_GREGSZ = 8 |
51 | #if _MIPS_SIM == _ABIO32 && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ | |
52 | MCONTEXT_GREGOFF = 4 | |
53 | #else | |
54 | MCONTEXT_GREGOFF = 0 | |
55 | #endif | |
ff347533 JM |
56 | |
57 | NESTED (__setcontext, FRAMESZ, ra) | |
58 | .mask MASK, -(ARGSZ * SZREG) | |
59 | .fmask 0x00000000, 0 | |
60 | ||
61 | #ifdef __PIC__ | |
62 | SETUP_GP | |
63 | #endif | |
64 | ||
65 | PTR_ADDIU sp, -FRAMESZ | |
aea7a9b9 | 66 | cfi_adjust_cfa_offset (FRAMESZ) |
ff347533 JM |
67 | |
68 | #ifdef __PIC__ | |
aea7a9b9 | 69 | SETUP_GP64_STACK (GPOFF, __setcontext) |
ff347533 JM |
70 | SAVE_GP (GPOFF) |
71 | #endif | |
72 | ||
73 | #ifdef PROF | |
74 | .set noat | |
75 | move AT, ra | |
76 | jal _mcount | |
77 | .set at | |
78 | #endif | |
79 | ||
80 | /* Check for the magic flag. */ | |
81 | li v0, 1 | |
b309f058 GC |
82 | /* zero */ |
83 | REG_L v1, (MCONTEXT_GREGOFF + 0 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) | |
ff347533 JM |
84 | bne v0, v1, 98f |
85 | ||
86 | REG_S a0, A0OFF(sp) | |
87 | ||
88 | /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */ | |
89 | li a3, _NSIG8 | |
90 | move a2, zero | |
91 | PTR_ADDU a1, a0, UCONTEXT_SIGMASK | |
92 | li a0, SIG_SETMASK | |
93 | ||
94 | li v0, SYS_ify (rt_sigprocmask) | |
95 | syscall | |
96 | bnez a3, 99f | |
97 | ||
98 | REG_L v0, A0OFF(sp) | |
99 | ||
100 | #ifdef __mips_hard_float | |
101 | # if _MIPS_SIM == _ABI64 | |
102 | l.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0) | |
103 | l.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0) | |
104 | l.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0) | |
105 | l.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0) | |
106 | l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0) | |
107 | l.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0) | |
108 | l.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0) | |
109 | l.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0) | |
110 | ||
111 | # else /* _MIPS_SIM != _ABI64 */ | |
112 | l.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0) | |
113 | l.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0) | |
114 | l.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0) | |
115 | l.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0) | |
116 | l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0) | |
117 | l.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0) | |
118 | ||
119 | # endif /* _MIPS_SIM != _ABI64 */ | |
120 | ||
121 | lw v1, MCONTEXT_FPC_CSR(v0) | |
122 | ctc1 v1, fcr31 | |
123 | #endif /* __mips_hard_float */ | |
124 | ||
125 | /* Note the contents of argument registers will be random | |
126 | unless makecontext() has been called. */ | |
b309f058 GC |
127 | REG_L a0, (MCONTEXT_GREGOFF + 4 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) |
128 | REG_L a1, (MCONTEXT_GREGOFF + 5 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
129 | REG_L a2, (MCONTEXT_GREGOFF + 6 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
130 | REG_L a3, (MCONTEXT_GREGOFF + 7 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
ff347533 | 131 | #if _MIPS_SIM != _ABIO32 |
b309f058 GC |
132 | REG_L a4, (MCONTEXT_GREGOFF + 8 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) |
133 | REG_L a5, (MCONTEXT_GREGOFF + 9 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
134 | REG_L a6, (MCONTEXT_GREGOFF + 10 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
135 | REG_L a7, (MCONTEXT_GREGOFF + 11 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
ff347533 JM |
136 | #endif |
137 | ||
b309f058 GC |
138 | REG_L s0, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) |
139 | REG_L s1, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
140 | REG_L s2, (MCONTEXT_GREGOFF + 18 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
141 | REG_L s3, (MCONTEXT_GREGOFF + 19 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
142 | REG_L s4, (MCONTEXT_GREGOFF + 20 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
143 | REG_L s5, (MCONTEXT_GREGOFF + 21 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
144 | REG_L s6, (MCONTEXT_GREGOFF + 22 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
145 | REG_L s7, (MCONTEXT_GREGOFF + 23 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
ff347533 | 146 | #if ! defined (__PIC__) || _MIPS_SIM != _ABIO32 |
b309f058 | 147 | REG_L gp, (MCONTEXT_GREGOFF + 28 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) |
ff347533 | 148 | #endif |
b309f058 GC |
149 | REG_L sp, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) |
150 | REG_L fp, (MCONTEXT_GREGOFF + 30 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
151 | REG_L ra, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) | |
152 | REG_L t9, (MCONTEXT_GREGOFF + MCONTEXT_PC)(v0) | |
ff347533 JM |
153 | |
154 | move v0, zero | |
155 | jr t9 | |
156 | ||
157 | 98: | |
158 | /* This is a context obtained from a signal handler. | |
159 | Perform a full restore by pushing the context | |
160 | passed onto a simulated signal frame on the stack | |
161 | and call the signal return syscall as if a signal | |
162 | handler exited normally. */ | |
163 | PTR_ADDIU sp, -((RT_SIGFRAME_SIZE + ALSZ) & ALMASK) | |
aea7a9b9 | 164 | cfi_adjust_cfa_offset ((RT_SIGFRAME_SIZE + ALSZ) & ALMASK) |
ff347533 JM |
165 | |
166 | /* Only ucontext is referred to from rt_sigreturn, | |
167 | copy it. */ | |
168 | PTR_ADDIU t1, sp, RT_SIGFRAME_UCONTEXT | |
169 | li t3, ((UCONTEXT_SIZE + SZREG - 1) / SZREG) - 1 | |
170 | 0: | |
171 | REG_L t2, (a0) | |
172 | PTR_ADDIU a0, SZREG | |
173 | REG_S t2, (t1) | |
174 | PTR_ADDIU t1, SZREG | |
175 | .set noreorder | |
176 | bgtz t3, 0b | |
177 | addiu t3, -1 | |
178 | .set reorder | |
179 | ||
180 | /* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe. */ | |
181 | li v0, SYS_ify (rt_sigreturn) | |
182 | syscall | |
183 | ||
184 | /* Restore the stack and fall through to the error | |
185 | path. Successful rt_sigreturn never returns to | |
186 | its calling place. */ | |
187 | PTR_ADDIU sp, ((RT_SIGFRAME_SIZE + ALSZ) & ALMASK) | |
aea7a9b9 | 188 | cfi_adjust_cfa_offset (-((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)) |
ff347533 JM |
189 | 99: |
190 | #ifdef __PIC__ | |
191 | PTR_LA t9, JUMPTARGET (__syscall_error) | |
aea7a9b9 | 192 | RESTORE_GP64_STACK |
ff347533 | 193 | PTR_ADDIU sp, FRAMESZ |
aea7a9b9 | 194 | cfi_adjust_cfa_offset (-FRAMESZ) |
ff347533 JM |
195 | jr t9 |
196 | ||
197 | #else /* ! __PIC__ */ | |
198 | ||
199 | j JUMPTARGET (__syscall_error) | |
200 | #endif /* ! __PIC__ */ | |
201 | PSEUDO_END (__setcontext) | |
202 | ||
203 | weak_alias (__setcontext, setcontext) |