1 /* Assembly macros for RISC-V.
2 Copyright (C) 2011-2018
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 #ifndef _LINUX_RISCV_SYSDEP_H
20 #define _LINUX_RISCV_SYSDEP_H 1
21
22 #include <sysdeps/unix/sysv/linux/sysdep.h>
23 #include <sysdeps/unix/sysdep.h>
24 #include <tls.h>
25
26 #undef SYS_ify
27 #define SYS_ify(syscall_name) __NR_##syscall_name
28
29 #if __WORDSIZE == 32
30
31 /* Workarounds for generic code needing to handle 64-bit time_t. */
32
33 /* Fix sysdeps/unix/sysv/linux/clock_getcpuclockid.c. */
34 #define __NR_clock_getres __NR_clock_getres_time64
35 /* Fix sysdeps/nptl/lowlevellock-futex.h. */
36 #define __NR_futex __NR_futex_time64
37 /* Fix sysdeps/unix/sysv/linux/pause.c. */
38 #define __NR_ppoll __NR_ppoll_time64
39 /* Fix sysdeps/unix/sysv/linux/select.c. */
40 #define __NR_pselect6 __NR_pselect6_time64
41 /* Fix sysdeps/unix/sysv/linux/recvmmsg.c. */
42 #define __NR_recvmmsg __NR_recvmmsg_time64
43 /* Fix sysdeps/unix/sysv/linux/sigtimedwait.c. */
44 #define __NR_rt_sigtimedwait __NR_rt_sigtimedwait_time64
45 /* Fix sysdeps/unix/sysv/linux/semtimedop.c. */
46 #define __NR_semtimedop __NR_semtimedop_time64
47 /* Hack sysdeps/unix/sysv/linux/generic/utimes.c. */
48 #define __NR_utimensat __NR_utimensat_time64
49
50 #endif /* __WORDSIZE == 32 */
51
52 #ifdef __ASSEMBLER__
53
54 # include <sys/asm.h>
55
56 # define ENTRY(name) LEAF(name)
57
58 # define L(label) .L ## label
59
60 /* Performs a system call, handling errors by setting errno. Linux indicates
61 errors by setting a0 to a value between -1 and -4095. */
62 # undef PSEUDO
63 # define PSEUDO(name, syscall_name, args) \
64 .text; \
65 .align 2; \
66 ENTRY (name); \
67 li a7, SYS_ify (syscall_name); \
68 scall; \
69 li a7, -4096; \
70 bgtu a0, a7, .Lsyscall_error ## name;
71
72 # undef PSEUDO_END
73 # define PSEUDO_END(sym) \
74 SYSCALL_ERROR_HANDLER (sym) \
75 ret; \
76 END (sym)
77
78 # if !IS_IN (libc)
79 # if RTLD_PRIVATE_ERRNO
80 # define SYSCALL_ERROR_HANDLER(name) \
81 .Lsyscall_error ## name: \
82 li t1, -4096; \
83 neg a0, a0; \
84 sw a0, rtld_errno, t1; \
85 li a0, -1;
86 # elif defined (__PIC__)
87 # define SYSCALL_ERROR_HANDLER(name) \
88 .Lsyscall_error ## name: \
89 la.tls.ie t1, errno; \
90 add t1, t1, tp; \
91 neg a0, a0; \
92 sw a0, 0(t1); \
93 li a0, -1;
94 # else
95 # define SYSCALL_ERROR_HANDLER(name) \
96 .Lsyscall_error ## name: \
97 lui t1, %tprel_hi(errno); \
98 add t1, t1, tp, %tprel_add(errno); \
99 neg a0, a0; \
100 sw a0, %tprel_lo(errno)(t1); \
101 li a0, -1;
102 # endif
103 # else
104 # define SYSCALL_ERROR_HANDLER(name) \
105 .Lsyscall_error ## name: \
106 tail __syscall_error;
107 # endif
108
109 /* Performs a system call, not setting errno. */
110 # undef PSEUDO_NEORRNO
111 # define PSEUDO_NOERRNO(name, syscall_name, args) \
112 .align 2; \
113 ENTRY (name); \
114 li a7, SYS_ify (syscall_name); \
115 scall;
116
117 # undef PSEUDO_END_NOERRNO
118 # define PSEUDO_END_NOERRNO(name) \
119 END (name)
120
121 # undef ret_NOERRNO
122 # define ret_NOERRNO ret
123
124 /* Performs a system call, returning the error code. */
125 # undef PSEUDO_ERRVAL
126 # define PSEUDO_ERRVAL(name, syscall_name, args) \
127 PSEUDO_NOERRNO (name, syscall_name, args) \
128 neg a0, a0;
129
130 # undef PSEUDO_END_ERRVAL
131 # define PSEUDO_END_ERRVAL(name) \
132 END (name)
133
134 # undef ret_ERRVAL
135 # define ret_ERRVAL ret
136
137 #else /* !__ASSEMBLER__ */
138
139 # if __WORDSIZE == 64
140 # define VDSO_NAME "LINUX_4.15"
141 # define VDSO_HASH 182943605
142
143 /* List of system calls which are supported as vsyscalls only
144 for RV64. */
145 # define HAVE_CLOCK_GETRES64_VSYSCALL "__vdso_clock_getres"
146 # define HAVE_CLOCK_GETTIME64_VSYSCALL "__vdso_clock_gettime"
147 # define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday"
148 # else
149 # define VDSO_NAME "LINUX_5.4"
150 # define VDSO_HASH 61765876
151
152 /* RV32 does not support the gettime VDSO syscalls. */
153 # endif
154 # define HAVE_CLONE3_WRAPPER 1
155
156 /* List of system calls which are supported as vsyscalls (for RV32 and
157 RV64). */
158 # define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
159
160 # undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
161 # define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
162
163 # define INTERNAL_SYSCALL(name, nr, args...) \
164 internal_syscall##nr (SYS_ify (name), args)
165
166 # define INTERNAL_SYSCALL_NCS(number, nr, args...) \
167 internal_syscall##nr (number, args)
168
169 # define internal_syscall0(number, dummy...) \
170 ({ \
171 long int _sys_result; \
172 \
173 { \
174 register long int __a7 asm ("a7") = number; \
175 register long int __a0 asm ("a0"); \
176 __asm__ volatile ( \
177 "scall\n\t" \
178 : "=r" (__a0) \
179 : "r" (__a7) \
180 : __SYSCALL_CLOBBERS); \
181 _sys_result = __a0; \
182 } \
183 _sys_result; \
184 })
185
186 # define internal_syscall1(number, arg0) \
187 ({ \
188 long int _sys_result; \
189 long int _arg0 = (long int) (arg0); \
190 \
191 { \
192 register long int __a7 asm ("a7") = number; \
193 register long int __a0 asm ("a0") = _arg0; \
194 __asm__ volatile ( \
195 "scall\n\t" \
196 : "+r" (__a0) \
197 : "r" (__a7) \
198 : __SYSCALL_CLOBBERS); \
199 _sys_result = __a0; \
200 } \
201 _sys_result; \
202 })
203
204 # define internal_syscall2(number, arg0, arg1) \
205 ({ \
206 long int _sys_result; \
207 long int _arg0 = (long int) (arg0); \
208 long int _arg1 = (long int) (arg1); \
209 \
210 { \
211 register long int __a7 asm ("a7") = number; \
212 register long int __a0 asm ("a0") = _arg0; \
213 register long int __a1 asm ("a1") = _arg1; \
214 __asm__ volatile ( \
215 "scall\n\t" \
216 : "+r" (__a0) \
217 : "r" (__a7), "r" (__a1) \
218 : __SYSCALL_CLOBBERS); \
219 _sys_result = __a0; \
220 } \
221 _sys_result; \
222 })
223
224 # define internal_syscall3(number, arg0, arg1, arg2) \
225 ({ \
226 long int _sys_result; \
227 long int _arg0 = (long int) (arg0); \
228 long int _arg1 = (long int) (arg1); \
229 long int _arg2 = (long int) (arg2); \
230 \
231 { \
232 register long int __a7 asm ("a7") = number; \
233 register long int __a0 asm ("a0") = _arg0; \
234 register long int __a1 asm ("a1") = _arg1; \
235 register long int __a2 asm ("a2") = _arg2; \
236 __asm__ volatile ( \
237 "scall\n\t" \
238 : "+r" (__a0) \
239 : "r" (__a7), "r" (__a1), "r" (__a2) \
240 : __SYSCALL_CLOBBERS); \
241 _sys_result = __a0; \
242 } \
243 _sys_result; \
244 })
245
246 # define internal_syscall4(number, arg0, arg1, arg2, arg3) \
247 ({ \
248 long int _sys_result; \
249 long int _arg0 = (long int) (arg0); \
250 long int _arg1 = (long int) (arg1); \
251 long int _arg2 = (long int) (arg2); \
252 long int _arg3 = (long int) (arg3); \
253 \
254 { \
255 register long int __a7 asm ("a7") = number; \
256 register long int __a0 asm ("a0") = _arg0; \
257 register long int __a1 asm ("a1") = _arg1; \
258 register long int __a2 asm ("a2") = _arg2; \
259 register long int __a3 asm ("a3") = _arg3; \
260 __asm__ volatile ( \
261 "scall\n\t" \
262 : "+r" (__a0) \
263 : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3) \
264 : __SYSCALL_CLOBBERS); \
265 _sys_result = __a0; \
266 } \
267 _sys_result; \
268 })
269
270 # define internal_syscall5(number, arg0, arg1, arg2, arg3, arg4) \
271 ({ \
272 long int _sys_result; \
273 long int _arg0 = (long int) (arg0); \
274 long int _arg1 = (long int) (arg1); \
275 long int _arg2 = (long int) (arg2); \
276 long int _arg3 = (long int) (arg3); \
277 long int _arg4 = (long int) (arg4); \
278 \
279 { \
280 register long int __a7 asm ("a7") = number; \
281 register long int __a0 asm ("a0") = _arg0; \
282 register long int __a1 asm ("a1") = _arg1; \
283 register long int __a2 asm ("a2") = _arg2; \
284 register long int __a3 asm ("a3") = _arg3; \
285 register long int __a4 asm ("a4") = _arg4; \
286 __asm__ volatile ( \
287 "scall\n\t" \
288 : "+r" (__a0) \
289 : "r" (__a7), "r"(__a1), "r"(__a2), "r"(__a3), "r" (__a4) \
290 : __SYSCALL_CLOBBERS); \
291 _sys_result = __a0; \
292 } \
293 _sys_result; \
294 })
295
296 # define internal_syscall6(number, arg0, arg1, arg2, arg3, arg4, arg5) \
297 ({ \
298 long int _sys_result; \
299 long int _arg0 = (long int) (arg0); \
300 long int _arg1 = (long int) (arg1); \
301 long int _arg2 = (long int) (arg2); \
302 long int _arg3 = (long int) (arg3); \
303 long int _arg4 = (long int) (arg4); \
304 long int _arg5 = (long int) (arg5); \
305 \
306 { \
307 register long int __a7 asm ("a7") = number; \
308 register long int __a0 asm ("a0") = _arg0; \
309 register long int __a1 asm ("a1") = _arg1; \
310 register long int __a2 asm ("a2") = _arg2; \
311 register long int __a3 asm ("a3") = _arg3; \
312 register long int __a4 asm ("a4") = _arg4; \
313 register long int __a5 asm ("a5") = _arg5; \
314 __asm__ volatile ( \
315 "scall\n\t" \
316 : "+r" (__a0) \
317 : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3), \
318 "r" (__a4), "r" (__a5) \
319 : __SYSCALL_CLOBBERS); \
320 _sys_result = __a0; \
321 } \
322 _sys_result; \
323 })
324
325 # define internal_syscall7(number, arg0, arg1, arg2, arg3, arg4, arg5, arg6) \
326 ({ \
327 long int _sys_result; \
328 long int _arg0 = (long int) (arg0); \
329 long int _arg1 = (long int) (arg1); \
330 long int _arg2 = (long int) (arg2); \
331 long int _arg3 = (long int) (arg3); \
332 long int _arg4 = (long int) (arg4); \
333 long int _arg5 = (long int) (arg5); \
334 long int _arg6 = (long int) (arg6); \
335 \
336 { \
337 register long int __a7 asm ("a7") = number; \
338 register long int __a0 asm ("a0") = _arg0; \
339 register long int __a1 asm ("a1") = _arg1; \
340 register long int __a2 asm ("a2") = _arg2; \
341 register long int __a3 asm ("a3") = _arg3; \
342 register long int __a4 asm ("a4") = _arg4; \
343 register long int __a5 asm ("a5") = _arg5; \
344 register long int __a6 asm ("a6") = _arg6; \
345 __asm__ volatile ( \
346 "scall\n\t" \
347 : "+r" (__a0) \
348 : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3), \
349 "r" (__a4), "r" (__a5), "r" (__a6) \
350 : __SYSCALL_CLOBBERS); \
351 _sys_result = __a0; \
352 } \
353 _sys_result; \
354 })
355
356 # define __SYSCALL_CLOBBERS "memory"
357
358 extern long int __syscall_error (long int neg_errno);
359
360 #endif /* ! __ASSEMBLER__ */
361
362 #endif /* linux/riscv/sysdep.h */