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1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
---|---|
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library. If not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #ifndef _LINUX_MIPS_SYSDEP_H |
19 | #define _LINUX_MIPS_SYSDEP_H 1 |
20 | |
21 | /* There is some commonality. */ |
22 | #include <sysdeps/unix/sysv/linux/mips/sysdep.h> |
23 | #include <sysdeps/unix/sysv/linux/sysdep.h> |
24 | #include <sysdeps/unix/mips/mips64/sysdep.h> |
25 | |
26 | #include <tls.h> |
27 | |
28 | /* For Linux we can use the system call table in the header file |
29 | /usr/include/asm/unistd.h |
30 | of the kernel. But these symbols do not follow the SYS_* syntax |
31 | so we have to redefine the `SYS_ify' macro here. */ |
32 | #undef SYS_ify |
33 | #define SYS_ify(syscall_name) __NR_##syscall_name |
34 | |
35 | #ifdef __ASSEMBLER__ |
36 | |
37 | /* We don't want the label for the error handler to be visible in the symbol |
38 | table when we define it here. */ |
39 | # undef SYSCALL_ERROR_LABEL |
40 | # define SYSCALL_ERROR_LABEL 99b |
41 | |
42 | #else /* ! __ASSEMBLER__ */ |
43 | |
44 | #undef HAVE_INTERNAL_BRK_ADDR_SYMBOL |
45 | #define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1 |
46 | |
47 | #if _MIPS_SIM == _ABIN32 |
48 | /* Convert X to a long long, without losing any bits if it is one |
49 | already or warning if it is a 32-bit pointer. */ |
50 | # define ARGIFY(X) ((long long int) (__typeof__ ((X) - (X))) (X)) |
51 | typedef long long int __syscall_arg_t; |
52 | #else |
53 | # define ARGIFY(X) ((long int) (X)) |
54 | typedef long int __syscall_arg_t; |
55 | #endif |
56 | |
57 | /* Note that the original Linux syscall restart convention required the |
58 | instruction immediately preceding SYSCALL to initialize $v0 with the |
59 | syscall number. Then if a restart triggered, $v0 would have been |
60 | clobbered by the syscall interrupted, and needed to be reinititalized. |
61 | The kernel would decrement the PC by 4 before switching back to the |
62 | user mode so that $v0 had been reloaded before SYSCALL was executed |
63 | again. This implied the place $v0 was loaded from must have been |
64 | preserved across a syscall, e.g. an immediate, static register, stack |
65 | slot, etc. |
66 | |
67 | The convention was relaxed in Linux with a change applied to the kernel |
68 | GIT repository as commit 96187fb0bc30cd7919759d371d810e928048249d, that |
69 | first appeared in the 2.6.36 release. Since then the kernel has had |
70 | code that reloads $v0 upon syscall restart and resumes right at the |
71 | SYSCALL instruction, so no special arrangement is needed anymore. |
72 | |
73 | For backwards compatibility with existing kernel binaries we support |
74 | the old convention by choosing the instruction preceding SYSCALL |
75 | carefully. This also means we have to force a 32-bit encoding of the |
76 | microMIPS MOVE instruction if one is used. */ |
77 | |
78 | #ifdef __mips_micromips |
79 | # define MOVE32 "move32" |
80 | #else |
81 | # define MOVE32 "move" |
82 | #endif |
83 | |
84 | #undef INTERNAL_SYSCALL |
85 | #define INTERNAL_SYSCALL(name, nr, args...) \ |
86 | internal_syscall##nr ("li\t%0, %2\t\t\t# " #name "\n\t", \ |
87 | "IK" (SYS_ify (name)), \ |
88 | 0, args) |
89 | |
90 | #undef INTERNAL_SYSCALL_NCS |
91 | #define INTERNAL_SYSCALL_NCS(number, nr, args...) \ |
92 | internal_syscall##nr (MOVE32 "\t%0, %2\n\t", \ |
93 | "r" (__s0), \ |
94 | number, args) |
95 | |
96 | #define internal_syscall0(v0_init, input, number, dummy...) \ |
97 | ({ \ |
98 | long int _sys_result; \ |
99 | \ |
100 | { \ |
101 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
102 | = (number); \ |
103 | register __syscall_arg_t __v0 asm ("$2"); \ |
104 | register __syscall_arg_t __a3 asm ("$7"); \ |
105 | __asm__ volatile ( \ |
106 | ".set\tnoreorder\n\t" \ |
107 | v0_init \ |
108 | "syscall\n\t" \ |
109 | ".set reorder" \ |
110 | : "=r" (__v0), "=r" (__a3) \ |
111 | : input \ |
112 | : __SYSCALL_CLOBBERS); \ |
113 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
114 | } \ |
115 | _sys_result; \ |
116 | }) |
117 | |
118 | #define internal_syscall1(v0_init, input, number, arg1) \ |
119 | ({ \ |
120 | long int _sys_result; \ |
121 | \ |
122 | { \ |
123 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
124 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
125 | = (number); \ |
126 | register __syscall_arg_t __v0 asm ("$2"); \ |
127 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
128 | register __syscall_arg_t __a3 asm ("$7"); \ |
129 | __asm__ volatile ( \ |
130 | ".set\tnoreorder\n\t" \ |
131 | v0_init \ |
132 | "syscall\n\t" \ |
133 | ".set reorder" \ |
134 | : "=r" (__v0), "=r" (__a3) \ |
135 | : input, "r" (__a0) \ |
136 | : __SYSCALL_CLOBBERS); \ |
137 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
138 | } \ |
139 | _sys_result; \ |
140 | }) |
141 | |
142 | #define internal_syscall2(v0_init, input, number, arg1, arg2) \ |
143 | ({ \ |
144 | long int _sys_result; \ |
145 | \ |
146 | { \ |
147 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
148 | __syscall_arg_t _arg2 = ARGIFY (arg2); \ |
149 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
150 | = (number); \ |
151 | register __syscall_arg_t __v0 asm ("$2"); \ |
152 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
153 | register __syscall_arg_t __a1 asm ("$5") = _arg2; \ |
154 | register __syscall_arg_t __a3 asm ("$7"); \ |
155 | __asm__ volatile ( \ |
156 | ".set\tnoreorder\n\t" \ |
157 | v0_init \ |
158 | "syscall\n\t" \ |
159 | ".set\treorder" \ |
160 | : "=r" (__v0), "=r" (__a3) \ |
161 | : input, "r" (__a0), "r" (__a1) \ |
162 | : __SYSCALL_CLOBBERS); \ |
163 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
164 | } \ |
165 | _sys_result; \ |
166 | }) |
167 | |
168 | #define internal_syscall3(v0_init, input, number, arg1, arg2, arg3) \ |
169 | ({ \ |
170 | long int _sys_result; \ |
171 | \ |
172 | { \ |
173 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
174 | __syscall_arg_t _arg2 = ARGIFY (arg2); \ |
175 | __syscall_arg_t _arg3 = ARGIFY (arg3); \ |
176 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
177 | = (number); \ |
178 | register __syscall_arg_t __v0 asm ("$2"); \ |
179 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
180 | register __syscall_arg_t __a1 asm ("$5") = _arg2; \ |
181 | register __syscall_arg_t __a2 asm ("$6") = _arg3; \ |
182 | register __syscall_arg_t __a3 asm ("$7"); \ |
183 | __asm__ volatile ( \ |
184 | ".set\tnoreorder\n\t" \ |
185 | v0_init \ |
186 | "syscall\n\t" \ |
187 | ".set\treorder" \ |
188 | : "=r" (__v0), "=r" (__a3) \ |
189 | : input, "r" (__a0), "r" (__a1), "r" (__a2) \ |
190 | : __SYSCALL_CLOBBERS); \ |
191 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
192 | } \ |
193 | _sys_result; \ |
194 | }) |
195 | |
196 | #define internal_syscall4(v0_init, input, number, arg1, arg2, arg3, \ |
197 | arg4) \ |
198 | ({ \ |
199 | long int _sys_result; \ |
200 | \ |
201 | { \ |
202 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
203 | __syscall_arg_t _arg2 = ARGIFY (arg2); \ |
204 | __syscall_arg_t _arg3 = ARGIFY (arg3); \ |
205 | __syscall_arg_t _arg4 = ARGIFY (arg4); \ |
206 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
207 | = (number); \ |
208 | register __syscall_arg_t __v0 asm ("$2"); \ |
209 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
210 | register __syscall_arg_t __a1 asm ("$5") = _arg2; \ |
211 | register __syscall_arg_t __a2 asm ("$6") = _arg3; \ |
212 | register __syscall_arg_t __a3 asm ("$7") = _arg4; \ |
213 | __asm__ volatile ( \ |
214 | ".set\tnoreorder\n\t" \ |
215 | v0_init \ |
216 | "syscall\n\t" \ |
217 | ".set\treorder" \ |
218 | : "=r" (__v0), "+r" (__a3) \ |
219 | : input, "r" (__a0), "r" (__a1), "r" (__a2) \ |
220 | : __SYSCALL_CLOBBERS); \ |
221 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
222 | } \ |
223 | _sys_result; \ |
224 | }) |
225 | |
226 | #define internal_syscall5(v0_init, input, number, arg1, arg2, arg3, \ |
227 | arg4, arg5) \ |
228 | ({ \ |
229 | long int _sys_result; \ |
230 | \ |
231 | { \ |
232 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
233 | __syscall_arg_t _arg2 = ARGIFY (arg2); \ |
234 | __syscall_arg_t _arg3 = ARGIFY (arg3); \ |
235 | __syscall_arg_t _arg4 = ARGIFY (arg4); \ |
236 | __syscall_arg_t _arg5 = ARGIFY (arg5); \ |
237 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
238 | = (number); \ |
239 | register __syscall_arg_t __v0 asm ("$2"); \ |
240 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
241 | register __syscall_arg_t __a1 asm ("$5") = _arg2; \ |
242 | register __syscall_arg_t __a2 asm ("$6") = _arg3; \ |
243 | register __syscall_arg_t __a3 asm ("$7") = _arg4; \ |
244 | register __syscall_arg_t __a4 asm ("$8") = _arg5; \ |
245 | __asm__ volatile ( \ |
246 | ".set\tnoreorder\n\t" \ |
247 | v0_init \ |
248 | "syscall\n\t" \ |
249 | ".set\treorder" \ |
250 | : "=r" (__v0), "+r" (__a3) \ |
251 | : input, "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a4) \ |
252 | : __SYSCALL_CLOBBERS); \ |
253 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
254 | } \ |
255 | _sys_result; \ |
256 | }) |
257 | |
258 | #define internal_syscall6(v0_init, input, number, arg1, arg2, arg3, \ |
259 | arg4, arg5, arg6) \ |
260 | ({ \ |
261 | long int _sys_result; \ |
262 | \ |
263 | { \ |
264 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
265 | __syscall_arg_t _arg2 = ARGIFY (arg2); \ |
266 | __syscall_arg_t _arg3 = ARGIFY (arg3); \ |
267 | __syscall_arg_t _arg4 = ARGIFY (arg4); \ |
268 | __syscall_arg_t _arg5 = ARGIFY (arg5); \ |
269 | __syscall_arg_t _arg6 = ARGIFY (arg6); \ |
270 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
271 | = (number); \ |
272 | register __syscall_arg_t __v0 asm ("$2"); \ |
273 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
274 | register __syscall_arg_t __a1 asm ("$5") = _arg2; \ |
275 | register __syscall_arg_t __a2 asm ("$6") = _arg3; \ |
276 | register __syscall_arg_t __a3 asm ("$7") = _arg4; \ |
277 | register __syscall_arg_t __a4 asm ("$8") = _arg5; \ |
278 | register __syscall_arg_t __a5 asm ("$9") = _arg6; \ |
279 | __asm__ volatile ( \ |
280 | ".set\tnoreorder\n\t" \ |
281 | v0_init \ |
282 | "syscall\n\t" \ |
283 | ".set\treorder" \ |
284 | : "=r" (__v0), "+r" (__a3) \ |
285 | : input, "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a4), \ |
286 | "r" (__a5) \ |
287 | : __SYSCALL_CLOBBERS); \ |
288 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
289 | } \ |
290 | _sys_result; \ |
291 | }) |
292 | |
293 | #if __mips_isa_rev >= 6 |
294 | # define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \ |
295 | "$14", "$15", "$24", "$25", "memory" |
296 | #else |
297 | # define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \ |
298 | "$14", "$15", "$24", "$25", "hi", "lo", "memory" |
299 | #endif |
300 | |
301 | #endif /* __ASSEMBLER__ */ |
302 | |
303 | /* Pointer mangling is not yet supported for MIPS. */ |
304 | #define PTR_MANGLE(var) (void) (var) |
305 | #define PTR_DEMANGLE(var) (void) (var) |
306 | |
307 | #endif /* linux/mips/sysdep.h */ |
308 |
Warning: That file was not part of the compilation database. It may have many parsing errors.