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b168057a | 1 | /* Copyright (C) 2000-2015 Free Software Foundation, Inc. |
be122291 AO |
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 | |
ab84e3ff PE |
15 | License along with the GNU C Library. If not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
be122291 AO |
17 | |
18 | #ifndef _LINUX_MIPS_SYSDEP_H | |
19 | #define _LINUX_MIPS_SYSDEP_H 1 | |
20 | ||
21 | /* There is some commonality. */ | |
22 | #include <sysdeps/unix/mips/mips64/n64/sysdep.h> | |
23 | ||
8c276674 DJ |
24 | #include <tls.h> |
25 | ||
340f7976 JM |
26 | /* In order to get __set_errno() definition in INLINE_SYSCALL. */ |
27 | #ifndef __ASSEMBLER__ | |
28 | #include <errno.h> | |
29 | #endif | |
30 | ||
be122291 AO |
31 | /* For Linux we can use the system call table in the header file |
32 | /usr/include/asm/unistd.h | |
33 | of the kernel. But these symbols do not follow the SYS_* syntax | |
34 | so we have to redefine the `SYS_ify' macro here. */ | |
35 | #undef SYS_ify | |
2aee8949 | 36 | #define SYS_ify(syscall_name) __NR_##syscall_name |
be122291 | 37 | |
66a1dc87 RM |
38 | #ifdef __ASSEMBLER__ |
39 | ||
40 | /* We don't want the label for the error handler to be visible in the symbol | |
41 | table when we define it here. */ | |
66a1dc87 | 42 | # define SYSCALL_ERROR_LABEL 99b |
66a1dc87 RM |
43 | |
44 | #else /* ! __ASSEMBLER__ */ | |
be122291 | 45 | |
be122291 AO |
46 | /* Define a macro which expands into the inline wrapper code for a system |
47 | call. */ | |
48 | #undef INLINE_SYSCALL | |
29bfb065 | 49 | #define INLINE_SYSCALL(name, nr, args...) \ |
be122291 | 50 | ({ INTERNAL_SYSCALL_DECL(err); \ |
29bfb065 MR |
51 | long result_var = INTERNAL_SYSCALL (name, err, nr, args); \ |
52 | if ( INTERNAL_SYSCALL_ERROR_P (result_var, err) ) \ | |
53 | { \ | |
54 | __set_errno (INTERNAL_SYSCALL_ERRNO (result_var, err)); \ | |
55 | result_var = -1L; \ | |
56 | } \ | |
be122291 AO |
57 | result_var; }) |
58 | ||
59 | #undef INTERNAL_SYSCALL_DECL | |
6eb43a28 | 60 | #define INTERNAL_SYSCALL_DECL(err) long err __attribute__ ((unused)) |
be122291 AO |
61 | |
62 | #undef INTERNAL_SYSCALL_ERROR_P | |
6eb43a28 | 63 | #define INTERNAL_SYSCALL_ERROR_P(val, err) ((void) (val), (long) (err)) |
be122291 AO |
64 | |
65 | #undef INTERNAL_SYSCALL_ERRNO | |
6eb43a28 | 66 | #define INTERNAL_SYSCALL_ERRNO(val, err) ((void) (err), val) |
be122291 | 67 | |
b82ba2f0 MR |
68 | /* Note that the original Linux syscall restart convention required the |
69 | instruction immediately preceding SYSCALL to initialize $v0 with the | |
70 | syscall number. Then if a restart triggered, $v0 would have been | |
71 | clobbered by the syscall interrupted, and needed to be reinititalized. | |
72 | The kernel would decrement the PC by 4 before switching back to the | |
73 | user mode so that $v0 had been reloaded before SYSCALL was executed | |
74 | again. This implied the place $v0 was loaded from must have been | |
75 | preserved across a syscall, e.g. an immediate, static register, stack | |
76 | slot, etc. | |
77 | ||
78 | The convention was relaxed in Linux with a change applied to the kernel | |
79 | GIT repository as commit 96187fb0bc30cd7919759d371d810e928048249d, that | |
80 | first appeared in the 2.6.36 release. Since then the kernel has had | |
81 | code that reloads $v0 upon syscall restart and resumes right at the | |
82 | SYSCALL instruction, so no special arrangement is needed anymore. | |
83 | ||
84 | For backwards compatibility with existing kernel binaries we support | |
85 | the old convention by choosing the instruction preceding SYSCALL | |
86 | carefully. This also means we have to force a 32-bit encoding of the | |
87 | microMIPS MOVE instruction if one is used. */ | |
88 | ||
89 | #ifdef __mips_micromips | |
90 | # define MOVE32 "move32" | |
91 | #else | |
92 | # define MOVE32 "move" | |
93 | #endif | |
94 | ||
be122291 | 95 | #undef INTERNAL_SYSCALL |
b82ba2f0 MR |
96 | #define INTERNAL_SYSCALL(name, err, nr, args...) \ |
97 | internal_syscall##nr ("li\t%0, %2\t\t\t# " #name "\n\t", \ | |
98 | "IK" (SYS_ify (name)), \ | |
99 | 0, err, args) | |
be122291 | 100 | |
6428ce3c | 101 | #undef INTERNAL_SYSCALL_NCS |
b82ba2f0 MR |
102 | #define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \ |
103 | internal_syscall##nr (MOVE32 "\t%0, %2\n\t", \ | |
104 | "r" (__s0), \ | |
105 | number, err, args) | |
6428ce3c | 106 | |
b82ba2f0 | 107 | #define internal_syscall0(v0_init, input, number, err, dummy...) \ |
29bfb065 | 108 | ({ \ |
be122291 AO |
109 | long _sys_result; \ |
110 | \ | |
111 | { \ | |
f9834ea4 | 112 | register long __s0 asm ("$16") __attribute__ ((unused)) \ |
b82ba2f0 | 113 | = (number); \ |
f9834ea4 MR |
114 | register long __v0 asm ("$2"); \ |
115 | register long __a3 asm ("$7"); \ | |
29bfb065 MR |
116 | __asm__ volatile ( \ |
117 | ".set\tnoreorder\n\t" \ | |
b82ba2f0 | 118 | v0_init \ |
29bfb065 MR |
119 | "syscall\n\t" \ |
120 | ".set reorder" \ | |
121 | : "=r" (__v0), "=r" (__a3) \ | |
6428ce3c | 122 | : input \ |
29bfb065 | 123 | : __SYSCALL_CLOBBERS); \ |
be122291 AO |
124 | err = __a3; \ |
125 | _sys_result = __v0; \ | |
126 | } \ | |
127 | _sys_result; \ | |
128 | }) | |
129 | ||
b82ba2f0 | 130 | #define internal_syscall1(v0_init, input, number, err, arg1) \ |
29bfb065 | 131 | ({ \ |
be122291 AO |
132 | long _sys_result; \ |
133 | \ | |
134 | { \ | |
f9834ea4 | 135 | register long __s0 asm ("$16") __attribute__ ((unused)) \ |
b82ba2f0 | 136 | = (number); \ |
f9834ea4 MR |
137 | register long __v0 asm ("$2"); \ |
138 | register long __a0 asm ("$4") = (long) (arg1); \ | |
139 | register long __a3 asm ("$7"); \ | |
29bfb065 MR |
140 | __asm__ volatile ( \ |
141 | ".set\tnoreorder\n\t" \ | |
b82ba2f0 | 142 | v0_init \ |
29bfb065 MR |
143 | "syscall\n\t" \ |
144 | ".set reorder" \ | |
145 | : "=r" (__v0), "=r" (__a3) \ | |
146 | : input, "r" (__a0) \ | |
147 | : __SYSCALL_CLOBBERS); \ | |
be122291 AO |
148 | err = __a3; \ |
149 | _sys_result = __v0; \ | |
150 | } \ | |
151 | _sys_result; \ | |
152 | }) | |
153 | ||
b82ba2f0 | 154 | #define internal_syscall2(v0_init, input, number, err, arg1, arg2) \ |
29bfb065 | 155 | ({ \ |
be122291 AO |
156 | long _sys_result; \ |
157 | \ | |
158 | { \ | |
f9834ea4 | 159 | register long __s0 asm ("$16") __attribute__ ((unused)) \ |
b82ba2f0 | 160 | = (number); \ |
f9834ea4 MR |
161 | register long __v0 asm ("$2"); \ |
162 | register long __a0 asm ("$4") = (long) (arg1); \ | |
163 | register long __a1 asm ("$5") = (long) (arg2); \ | |
164 | register long __a3 asm ("$7"); \ | |
29bfb065 MR |
165 | __asm__ volatile ( \ |
166 | ".set\tnoreorder\n\t" \ | |
b82ba2f0 | 167 | v0_init \ |
29bfb065 MR |
168 | "syscall\n\t" \ |
169 | ".set\treorder" \ | |
170 | : "=r" (__v0), "=r" (__a3) \ | |
6428ce3c | 171 | : input, "r" (__a0), "r" (__a1) \ |
29bfb065 | 172 | : __SYSCALL_CLOBBERS); \ |
be122291 AO |
173 | err = __a3; \ |
174 | _sys_result = __v0; \ | |
175 | } \ | |
176 | _sys_result; \ | |
177 | }) | |
178 | ||
b82ba2f0 MR |
179 | #define internal_syscall3(v0_init, input, number, err, \ |
180 | arg1, arg2, arg3) \ | |
29bfb065 | 181 | ({ \ |
be122291 AO |
182 | long _sys_result; \ |
183 | \ | |
184 | { \ | |
f9834ea4 | 185 | register long __s0 asm ("$16") __attribute__ ((unused)) \ |
b82ba2f0 | 186 | = (number); \ |
f9834ea4 MR |
187 | register long __v0 asm ("$2"); \ |
188 | register long __a0 asm ("$4") = (long) (arg1); \ | |
189 | register long __a1 asm ("$5") = (long) (arg2); \ | |
190 | register long __a2 asm ("$6") = (long) (arg3); \ | |
191 | register long __a3 asm ("$7"); \ | |
29bfb065 MR |
192 | __asm__ volatile ( \ |
193 | ".set\tnoreorder\n\t" \ | |
b82ba2f0 | 194 | v0_init \ |
29bfb065 MR |
195 | "syscall\n\t" \ |
196 | ".set\treorder" \ | |
197 | : "=r" (__v0), "=r" (__a3) \ | |
6428ce3c | 198 | : input, "r" (__a0), "r" (__a1), "r" (__a2) \ |
29bfb065 | 199 | : __SYSCALL_CLOBBERS); \ |
be122291 AO |
200 | err = __a3; \ |
201 | _sys_result = __v0; \ | |
202 | } \ | |
203 | _sys_result; \ | |
204 | }) | |
205 | ||
b82ba2f0 MR |
206 | #define internal_syscall4(v0_init, input, number, err, \ |
207 | arg1, arg2, arg3, arg4) \ | |
29bfb065 | 208 | ({ \ |
be122291 AO |
209 | long _sys_result; \ |
210 | \ | |
211 | { \ | |
f9834ea4 | 212 | register long __s0 asm ("$16") __attribute__ ((unused)) \ |
b82ba2f0 | 213 | = (number); \ |
f9834ea4 MR |
214 | register long __v0 asm ("$2"); \ |
215 | register long __a0 asm ("$4") = (long) (arg1); \ | |
216 | register long __a1 asm ("$5") = (long) (arg2); \ | |
217 | register long __a2 asm ("$6") = (long) (arg3); \ | |
218 | register long __a3 asm ("$7") = (long) (arg4); \ | |
29bfb065 MR |
219 | __asm__ volatile ( \ |
220 | ".set\tnoreorder\n\t" \ | |
b82ba2f0 | 221 | v0_init \ |
29bfb065 MR |
222 | "syscall\n\t" \ |
223 | ".set\treorder" \ | |
224 | : "=r" (__v0), "+r" (__a3) \ | |
225 | : input, "r" (__a0), "r" (__a1), "r" (__a2) \ | |
226 | : __SYSCALL_CLOBBERS); \ | |
be122291 AO |
227 | err = __a3; \ |
228 | _sys_result = __v0; \ | |
229 | } \ | |
230 | _sys_result; \ | |
231 | }) | |
232 | ||
b82ba2f0 MR |
233 | #define internal_syscall5(v0_init, input, number, err, \ |
234 | arg1, arg2, arg3, arg4, arg5) \ | |
29bfb065 | 235 | ({ \ |
be122291 AO |
236 | long _sys_result; \ |
237 | \ | |
238 | { \ | |
f9834ea4 | 239 | register long __s0 asm ("$16") __attribute__ ((unused)) \ |
b82ba2f0 | 240 | = (number); \ |
f9834ea4 MR |
241 | register long __v0 asm ("$2"); \ |
242 | register long __a0 asm ("$4") = (long) (arg1); \ | |
243 | register long __a1 asm ("$5") = (long) (arg2); \ | |
244 | register long __a2 asm ("$6") = (long) (arg3); \ | |
245 | register long __a3 asm ("$7") = (long) (arg4); \ | |
246 | register long __a4 asm ("$8") = (long) (arg5); \ | |
29bfb065 MR |
247 | __asm__ volatile ( \ |
248 | ".set\tnoreorder\n\t" \ | |
b82ba2f0 | 249 | v0_init \ |
29bfb065 MR |
250 | "syscall\n\t" \ |
251 | ".set\treorder" \ | |
252 | : "=r" (__v0), "+r" (__a3) \ | |
6428ce3c | 253 | : input, "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a4) \ |
29bfb065 | 254 | : __SYSCALL_CLOBBERS); \ |
be122291 AO |
255 | err = __a3; \ |
256 | _sys_result = __v0; \ | |
257 | } \ | |
258 | _sys_result; \ | |
259 | }) | |
260 | ||
b82ba2f0 MR |
261 | #define internal_syscall6(v0_init, input, number, err, \ |
262 | arg1, arg2, arg3, arg4, arg5, arg6) \ | |
29bfb065 | 263 | ({ \ |
be122291 AO |
264 | long _sys_result; \ |
265 | \ | |
266 | { \ | |
f9834ea4 | 267 | register long __s0 asm ("$16") __attribute__ ((unused)) \ |
b82ba2f0 | 268 | = (number); \ |
f9834ea4 MR |
269 | register long __v0 asm ("$2"); \ |
270 | register long __a0 asm ("$4") = (long) (arg1); \ | |
271 | register long __a1 asm ("$5") = (long) (arg2); \ | |
272 | register long __a2 asm ("$6") = (long) (arg3); \ | |
273 | register long __a3 asm ("$7") = (long) (arg4); \ | |
274 | register long __a4 asm ("$8") = (long) (arg5); \ | |
275 | register long __a5 asm ("$9") = (long) (arg6); \ | |
29bfb065 MR |
276 | __asm__ volatile ( \ |
277 | ".set\tnoreorder\n\t" \ | |
b82ba2f0 | 278 | v0_init \ |
29bfb065 MR |
279 | "syscall\n\t" \ |
280 | ".set\treorder" \ | |
281 | : "=r" (__v0), "+r" (__a3) \ | |
6428ce3c DJ |
282 | : input, "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a4), \ |
283 | "r" (__a5) \ | |
29bfb065 | 284 | : __SYSCALL_CLOBBERS); \ |
be122291 AO |
285 | err = __a3; \ |
286 | _sys_result = __v0; \ | |
287 | } \ | |
288 | _sys_result; \ | |
289 | }) | |
290 | ||
145f3f8a | 291 | #define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \ |
f1297d79 | 292 | "$14", "$15", "$24", "$25", "hi", "lo", "memory" |
be122291 AO |
293 | #endif /* __ASSEMBLER__ */ |
294 | ||
908afa83 DJ |
295 | /* Pointer mangling is not yet supported for MIPS. */ |
296 | #define PTR_MANGLE(var) (void) (var) | |
297 | #define PTR_DEMANGLE(var) (void) (var) | |
298 | ||
be122291 | 299 | #endif /* linux/mips/sysdep.h */ |