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76e95c88 | 1 | /* Save current context and install the given one. |
d614a753 | 2 | Copyright (C) 2005-2020 Free Software Foundation, Inc. |
76e95c88 UD |
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 | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
76e95c88 UD |
18 | |
19 | #include <sysdep.h> | |
20 | ||
21 | #include "ucontext_i.h" | |
22 | ||
23 | /* int __swapcontext (ucontext_t *ouc, const ucontext_t *uc); */ | |
24 | ||
25 | .text | |
26 | .align 5 | |
76e95c88 UD |
27 | ENTRY(__swapcontext) |
28 | ||
29 | /* Return value of getcontext. R0 is the only register whose | |
30 | value is not preserved. */ | |
31 | mov #0, r0 | |
32 | mov.l r0, @(oR0,r4) | |
33 | mov.l r1, @(oR1,r4) | |
34 | mov.l r2, @(oR2,r4) | |
35 | mov.l r3, @(oR3,r4) | |
36 | mov.l r4, @(oR4,r4) | |
37 | mov.l r5, @(oR5,r4) | |
38 | mov.l r6, @(oR6,r4) | |
39 | mov.l r7, @(oR7,r4) | |
40 | mov r4, r0 | |
41 | add #(oMACL+4), r0 | |
42 | sts.l macl, @-r0 | |
43 | sts.l mach, @-r0 | |
44 | stc.l gbr, @-r0 | |
45 | ||
46 | /* Save T flag to SR. */ | |
47 | movt r1 | |
48 | mov.l r1, @-r0 | |
49 | sts.l pr, @-r0 | |
50 | ||
51 | /* The return address of getcontext is the restart pc. */ | |
52 | sts.l pr, @-r0 | |
53 | ||
54 | mov.l r15, @-r0 | |
55 | mov.l r14, @-r0 | |
56 | mov.l r13, @-r0 | |
57 | mov.l r12, @-r0 | |
58 | mov.l r11, @-r0 | |
59 | mov.l r10, @-r0 | |
60 | mov.l r9, @-r0 | |
61 | mov.l r8, @-r0 | |
62 | ||
0899b889 | 63 | #ifdef __SH_FPU_ANY__ |
76e95c88 UD |
64 | mov r4, r0 |
65 | /* We need 2 add instruction because oFPUL+4 >= 127. */ | |
66 | add #124,r0 | |
67 | add #(oFPUL+4-124),r0 | |
68 | sts.l fpul, @-r0 | |
69 | sts.l fpscr, @-r0 | |
70 | frchg | |
71 | fmov.s fr15, @-r0 | |
72 | fmov.s fr14, @-r0 | |
73 | fmov.s fr13, @-r0 | |
74 | fmov.s fr12, @-r0 | |
75 | fmov.s fr11, @-r0 | |
76 | fmov.s fr10, @-r0 | |
77 | fmov.s fr9, @-r0 | |
78 | fmov.s fr8, @-r0 | |
79 | fmov.s fr7, @-r0 | |
80 | fmov.s fr6, @-r0 | |
81 | fmov.s fr5, @-r0 | |
82 | fmov.s fr4, @-r0 | |
83 | fmov.s fr3, @-r0 | |
84 | fmov.s fr2, @-r0 | |
85 | fmov.s fr1, @-r0 | |
86 | fmov.s fr0, @-r0 | |
87 | frchg | |
88 | fmov.s fr15, @-r0 | |
89 | fmov.s fr14, @-r0 | |
90 | fmov.s fr13, @-r0 | |
91 | fmov.s fr12, @-r0 | |
92 | fmov.s fr11, @-r0 | |
93 | fmov.s fr10, @-r0 | |
94 | fmov.s fr9, @-r0 | |
95 | fmov.s fr8, @-r0 | |
96 | fmov.s fr7, @-r0 | |
97 | fmov.s fr6, @-r0 | |
98 | fmov.s fr5, @-r0 | |
99 | fmov.s fr4, @-r0 | |
100 | fmov.s fr3, @-r0 | |
101 | fmov.s fr2, @-r0 | |
102 | fmov.s fr1, @-r0 | |
103 | fmov.s fr0, @-r0 | |
0899b889 | 104 | #endif /* __SH_FPU_ANY__ */ |
76e95c88 UD |
105 | |
106 | mov r5, r8 | |
107 | ||
108 | /* sigprocmask (SIG_SETMASK, &uc->uc_sigmask, &ouc->uc_sigmask). */ | |
109 | mov #oSIGMASK, r1 | |
110 | extu.b r1, r1 | |
111 | add r1, r5 | |
112 | mov r4, r6 | |
113 | add r1, r6 | |
114 | mov #SIG_SETMASK, r4 | |
115 | mov #+SYS_ify(sigprocmask), r3 | |
116 | trapa #0x13 | |
117 | mov r0, r1 | |
118 | mov #-12, r2 | |
119 | shad r2, r1 | |
120 | not r1, r1 // r1=0 means r0 = -1 to -4095 | |
121 | tst r1, r1 // i.e. error in linux | |
122 | bf .Lswapcontext_restore | |
0899b889 | 123 | .Lsyscall_error: |
76e95c88 UD |
124 | SYSCALL_ERROR_HANDLER |
125 | .Lpseudo_end: | |
126 | rts | |
127 | nop | |
0899b889 UD |
128 | .Lswapcontext_restore: |
129 | #ifdef __SH_FPU_ANY__ | |
76e95c88 UD |
130 | mov r8, r0 |
131 | add #(oFR0),r0 | |
132 | fmov.s @r0+, fr0 | |
133 | fmov.s @r0+, fr1 | |
134 | fmov.s @r0+, fr2 | |
135 | fmov.s @r0+, fr3 | |
136 | fmov.s @r0+, fr4 | |
137 | fmov.s @r0+, fr5 | |
138 | fmov.s @r0+, fr6 | |
139 | fmov.s @r0+, fr7 | |
140 | fmov.s @r0+, fr8 | |
141 | fmov.s @r0+, fr9 | |
142 | fmov.s @r0+, fr10 | |
143 | fmov.s @r0+, fr11 | |
144 | fmov.s @r0+, fr12 | |
145 | fmov.s @r0+, fr13 | |
146 | fmov.s @r0+, fr14 | |
147 | fmov.s @r0+, fr15 | |
148 | frchg | |
149 | fmov.s @r0+, fr0 | |
150 | fmov.s @r0+, fr1 | |
151 | fmov.s @r0+, fr2 | |
152 | fmov.s @r0+, fr3 | |
153 | fmov.s @r0+, fr4 | |
154 | fmov.s @r0+, fr5 | |
155 | fmov.s @r0+, fr6 | |
156 | fmov.s @r0+, fr7 | |
157 | fmov.s @r0+, fr8 | |
158 | fmov.s @r0+, fr9 | |
159 | fmov.s @r0+, fr10 | |
160 | fmov.s @r0+, fr11 | |
161 | fmov.s @r0+, fr12 | |
162 | fmov.s @r0+, fr13 | |
163 | fmov.s @r0+, fr14 | |
164 | fmov.s @r0+, fr15 | |
165 | frchg | |
166 | lds.l @r0+, fpscr | |
167 | lds.l @r0+, fpul | |
0899b889 | 168 | #endif /* __SH_FPU_ANY__ */ |
76e95c88 UD |
169 | |
170 | mov r8, r0 | |
171 | add #(oPC), r0 | |
172 | mov.l @r0+, r2 | |
173 | lds.l @r0+, pr | |
174 | ||
175 | /* Restore T frag. */ | |
176 | mov.l @r0+, r1 | |
177 | shlr r1 | |
178 | /* Skip GBR which is used for thread pointer. */ | |
179 | add #4, r0 | |
180 | ||
181 | lds.l @r0+, mach | |
182 | lds.l @r0+, macl | |
183 | ||
184 | mov r8, r0 | |
185 | add #(oR9), r0 | |
186 | mov.l @r0+, r9 | |
187 | mov.l @r0+, r10 | |
188 | mov.l @r0+, r11 | |
189 | mov.l @r0+, r12 | |
190 | mov.l @r0+, r13 | |
191 | mov.l @r0+, r14 | |
192 | mov.l @r0+, r15 | |
193 | ||
194 | mov r8, r0 | |
195 | mov.l @(oR0,r0), r1 | |
196 | mov.l r1, @-r15 | |
197 | cfi_adjust_cfa_offset(4) | |
198 | cfi_rel_offset (r1, 0) | |
199 | mov.l r2, @-r15 | |
200 | cfi_adjust_cfa_offset(4) | |
201 | cfi_rel_offset (r2, 0) | |
202 | ||
203 | mov.l @(oR1,r0), r1 | |
204 | mov.l @(oR2,r0), r2 | |
205 | mov.l @(oR3,r0), r3 | |
206 | mov.l @(oR4,r0), r4 | |
207 | mov.l @(oR5,r0), r5 | |
208 | mov.l @(oR6,r0), r6 | |
209 | mov.l @(oR7,r0), r7 | |
210 | mov.l @(oR8,r0), r8 | |
211 | mov.l @r15+, r0 | |
65a4de4e | 212 | cfi_adjust_cfa_offset(-4) |
76e95c88 UD |
213 | jmp @r0 |
214 | mov.l @r15+, r0 | |
0899b889 | 215 | |
76e95c88 UD |
216 | PSEUDO_END(__swapcontext) |
217 | ||
218 | weak_alias (__swapcontext, swapcontext) |