1 | /* Save current context and install the given one. |
2 | Copyright (C) 2005-2022 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 | |
21 | #include "ucontext_i.h" |
22 | |
23 | /* int __swapcontext (ucontext_t *ouc, const ucontext_t *uc); */ |
24 | |
25 | .text |
26 | .align 5 |
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 | |
63 | #ifdef __SH_FPU_ANY__ |
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 |
104 | #endif /* __SH_FPU_ANY__ */ |
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 |
123 | .Lsyscall_error: |
124 | SYSCALL_ERROR_HANDLER |
125 | .Lpseudo_end: |
126 | rts |
127 | nop |
128 | .Lswapcontext_restore: |
129 | #ifdef __SH_FPU_ANY__ |
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 |
168 | #endif /* __SH_FPU_ANY__ */ |
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 |
212 | cfi_adjust_cfa_offset(-4) |
213 | jmp @r0 |
214 | mov.l @r15+, r0 |
215 | |
216 | PSEUDO_END(__swapcontext) |
217 | |
218 | weak_alias (__swapcontext, swapcontext) |
219 | |