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# define HAVE_GETRANDOM_VSYSCALL "__vdso_getrandom"
149# else
150# define VDSO_NAME "LINUX_5.4"
151# define VDSO_HASH 61765876
152
153/* RV32 does not support the gettime and getrandom VDSO syscalls. */
154# endif
155# define HAVE_CLONE3_WRAPPER 1
156
157/* List of system calls which are supported as vsyscalls (for RV32 and
158 RV64). */
159# define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
160# define HAVE_RISCV_HWPROBE "__vdso_riscv_hwprobe"
161
162# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
163# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
164
165# define INTERNAL_SYSCALL(name, nr, args...) \
166 internal_syscall##nr (SYS_ify (name), args)
167
168# define INTERNAL_SYSCALL_NCS(number, nr, args...) \
169 internal_syscall##nr (number, args)
170
171# define internal_syscall0(number, dummy...) \
172({ \
173 long int _sys_result; \
174 \
175 { \
176 register long int __a7 asm ("a7") = number; \
177 register long int __a0 asm ("a0"); \
178 __asm__ volatile ( \
179 "scall\n\t" \
180 : "=r" (__a0) \
181 : "r" (__a7) \
182 : __SYSCALL_CLOBBERS); \
183 _sys_result = __a0; \
184 } \
185 _sys_result; \
186})
187
188# define internal_syscall1(number, arg0) \
189({ \
190 long int _sys_result; \
191 long int _arg0 = (long int) (arg0); \
192 \
193 { \
194 register long int __a7 asm ("a7") = number; \
195 register long int __a0 asm ("a0") = _arg0; \
196 __asm__ volatile ( \
197 "scall\n\t" \
198 : "+r" (__a0) \
199 : "r" (__a7) \
200 : __SYSCALL_CLOBBERS); \
201 _sys_result = __a0; \
202 } \
203 _sys_result; \
204})
205
206# define internal_syscall2(number, arg0, arg1) \
207({ \
208 long int _sys_result; \
209 long int _arg0 = (long int) (arg0); \
210 long int _arg1 = (long int) (arg1); \
211 \
212 { \
213 register long int __a7 asm ("a7") = number; \
214 register long int __a0 asm ("a0") = _arg0; \
215 register long int __a1 asm ("a1") = _arg1; \
216 __asm__ volatile ( \
217 "scall\n\t" \
218 : "+r" (__a0) \
219 : "r" (__a7), "r" (__a1) \
220 : __SYSCALL_CLOBBERS); \
221 _sys_result = __a0; \
222 } \
223 _sys_result; \
224})
225
226# define internal_syscall3(number, arg0, arg1, arg2) \
227({ \
228 long int _sys_result; \
229 long int _arg0 = (long int) (arg0); \
230 long int _arg1 = (long int) (arg1); \
231 long int _arg2 = (long int) (arg2); \
232 \
233 { \
234 register long int __a7 asm ("a7") = number; \
235 register long int __a0 asm ("a0") = _arg0; \
236 register long int __a1 asm ("a1") = _arg1; \
237 register long int __a2 asm ("a2") = _arg2; \
238 __asm__ volatile ( \
239 "scall\n\t" \
240 : "+r" (__a0) \
241 : "r" (__a7), "r" (__a1), "r" (__a2) \
242 : __SYSCALL_CLOBBERS); \
243 _sys_result = __a0; \
244 } \
245 _sys_result; \
246})
247
248# define internal_syscall4(number, arg0, arg1, arg2, arg3) \
249({ \
250 long int _sys_result; \
251 long int _arg0 = (long int) (arg0); \
252 long int _arg1 = (long int) (arg1); \
253 long int _arg2 = (long int) (arg2); \
254 long int _arg3 = (long int) (arg3); \
255 \
256 { \
257 register long int __a7 asm ("a7") = number; \
258 register long int __a0 asm ("a0") = _arg0; \
259 register long int __a1 asm ("a1") = _arg1; \
260 register long int __a2 asm ("a2") = _arg2; \
261 register long int __a3 asm ("a3") = _arg3; \
262 __asm__ volatile ( \
263 "scall\n\t" \
264 : "+r" (__a0) \
265 : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3) \
266 : __SYSCALL_CLOBBERS); \
267 _sys_result = __a0; \
268 } \
269 _sys_result; \
270})
271
272# define internal_syscall5(number, arg0, arg1, arg2, arg3, arg4) \
273({ \
274 long int _sys_result; \
275 long int _arg0 = (long int) (arg0); \
276 long int _arg1 = (long int) (arg1); \
277 long int _arg2 = (long int) (arg2); \
278 long int _arg3 = (long int) (arg3); \
279 long int _arg4 = (long int) (arg4); \
280 \
281 { \
282 register long int __a7 asm ("a7") = number; \
283 register long int __a0 asm ("a0") = _arg0; \
284 register long int __a1 asm ("a1") = _arg1; \
285 register long int __a2 asm ("a2") = _arg2; \
286 register long int __a3 asm ("a3") = _arg3; \
287 register long int __a4 asm ("a4") = _arg4; \
288 __asm__ volatile ( \
289 "scall\n\t" \
290 : "+r" (__a0) \
291 : "r" (__a7), "r"(__a1), "r"(__a2), "r"(__a3), "r" (__a4) \
292 : __SYSCALL_CLOBBERS); \
293 _sys_result = __a0; \
294 } \
295 _sys_result; \
296})
297
298# define internal_syscall6(number, arg0, arg1, arg2, arg3, arg4, arg5) \
299({ \
300 long int _sys_result; \
301 long int _arg0 = (long int) (arg0); \
302 long int _arg1 = (long int) (arg1); \
303 long int _arg2 = (long int) (arg2); \
304 long int _arg3 = (long int) (arg3); \
305 long int _arg4 = (long int) (arg4); \
306 long int _arg5 = (long int) (arg5); \
307 \
308 { \
309 register long int __a7 asm ("a7") = number; \
310 register long int __a0 asm ("a0") = _arg0; \
311 register long int __a1 asm ("a1") = _arg1; \
312 register long int __a2 asm ("a2") = _arg2; \
313 register long int __a3 asm ("a3") = _arg3; \
314 register long int __a4 asm ("a4") = _arg4; \
315 register long int __a5 asm ("a5") = _arg5; \
316 __asm__ volatile ( \
317 "scall\n\t" \
318 : "+r" (__a0) \
319 : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3), \
320 "r" (__a4), "r" (__a5) \
321 : __SYSCALL_CLOBBERS); \
322 _sys_result = __a0; \
323 } \
324 _sys_result; \
325})
326
327# define internal_syscall7(number, arg0, arg1, arg2, arg3, arg4, arg5, arg6) \
328({ \
329 long int _sys_result; \
330 long int _arg0 = (long int) (arg0); \
331 long int _arg1 = (long int) (arg1); \
332 long int _arg2 = (long int) (arg2); \
333 long int _arg3 = (long int) (arg3); \
334 long int _arg4 = (long int) (arg4); \
335 long int _arg5 = (long int) (arg5); \
336 long int _arg6 = (long int) (arg6); \
337 \
338 { \
339 register long int __a7 asm ("a7") = number; \
340 register long int __a0 asm ("a0") = _arg0; \
341 register long int __a1 asm ("a1") = _arg1; \
342 register long int __a2 asm ("a2") = _arg2; \
343 register long int __a3 asm ("a3") = _arg3; \
344 register long int __a4 asm ("a4") = _arg4; \
345 register long int __a5 asm ("a5") = _arg5; \
346 register long int __a6 asm ("a6") = _arg6; \
347 __asm__ volatile ( \
348 "scall\n\t" \
349 : "+r" (__a0) \
350 : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3), \
351 "r" (__a4), "r" (__a5), "r" (__a6) \
352 : __SYSCALL_CLOBBERS); \
353 _sys_result = __a0; \
354 } \
355 _sys_result; \
356})
357
358#ifdef __riscv_v
359# define __SYSCALL_CLOBBERS "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", \
360 "v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", \
361 "v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", \
362 "v30", "v31", "vl", "vtype", "vxrm", "vxsat", "memory"
363#else
364# define __SYSCALL_CLOBBERS "memory"
365#endif
366
367extern long int __syscall_error (long int neg_errno);
368
369#endif /* ! __ASSEMBLER__ */
370
371#endif /* linux/riscv/sysdep.h */