1/* Assembly macros for LoongArch.
2 Copyright (C) 2022-2026 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#ifndef _LINUX_LOONGARCH_SYSDEP_H
20#define _LINUX_LOONGARCH_SYSDEP_H 1
21
22#include <sysdeps/loongarch/sysdep.h>
23#include <sysdeps/unix/sysv/linux/sysdep.h>
24#include <sysdeps/unix/sysdep.h>
25#include <tls.h>
26
27#ifdef __ASSEMBLER__
28
29#include <sys/asm.h>
30#define ret jirl zero, ra, 0
31#define L(label) .L##label
32
33/* Performs a system call, handling errors by setting errno. Linux indicates
34 errors by setting a0 to a value between -1 and -4095. */
35#undef PSEUDO
36#define PSEUDO(name, syscall_name, args) \
37 ENTRY (name); \
38 LI a7, SYS_ify (syscall_name); \
39 syscall 0; \
40 LI a7, -4096; \
41 bltu a7, a0, .Lsyscall_error##name;
42
43#undef PSEUDO_END
44#define PSEUDO_END(sym) \
45 SYSCALL_ERROR_HANDLER (sym); \
46 ret; \
47 END (sym);
48
49#if !IS_IN(libc)
50#if RTLD_PRIVATE_ERRNO
51
52#define SYSCALL_ERROR_HANDLER(name) \
53 .Lsyscall_error##name : la t0, rtld_errno; \
54 sub.w a0, zero, a0; \
55 st.w a0, t0, 0; \
56 LI a0, -1;
57
58#else
59
60#define SYSCALL_ERROR_HANDLER(name) \
61 .Lsyscall_error##name : la.tls.ie t0, errno; \
62 ADD t0, tp, t0; \
63 sub.w a0, zero, a0; \
64 st.w a0, t0, 0; \
65 LI a0, -1;
66
67#endif
68#else
69
70#define SYSCALL_ERROR_HANDLER(name) .Lsyscall_error##name : b __syscall_error;
71
72#endif
73
74/* Performs a system call, not setting errno. */
75#undef PSEUDO_NEORRNO
76#define PSEUDO_NOERRNO(name, syscall_name, args) \
77 ENTRY (name); \
78 LI a7, SYS_ify (syscall_name); \
79 syscall 0;
80
81#undef PSEUDO_END_NOERRNO
82#define PSEUDO_END_NOERRNO(name) END (name);
83
84#undef ret_NOERRNO
85#define ret_NOERRNO ret
86
87/* Performs a system call, returning the error code. */
88#undef PSEUDO_ERRVAL
89#if __loongarch_grlen == 64
90#define PSEUDO_ERRVAL(name, syscall_name, args) \
91 PSEUDO_NOERRNO (name, syscall_name, args); \
92 slli.d a0, a0, 32; \
93 srai.d a0, a0, 32; /* sign_ext */ \
94 sub.d a0, zero, a0;
95#else
96#define PSEUDO_ERRVAL(name, syscall_name, args) \
97 PSEUDO_NOERRNO (name, syscall_name, args); \
98 sub.w a0, zero, a0;
99#endif
100
101#undef PSEUDO_END_ERRVAL
102#define PSEUDO_END_ERRVAL(name) END (name);
103
104#undef ret_ERRVAL
105#define ret_ERRVAL ret
106
107#endif /* __ASSEMBLER__ */
108
109/* In order to get __set_errno() definition in INLINE_SYSCALL. */
110#ifndef __ASSEMBLER__
111#include <errno.h>
112#endif
113
114#include <sysdeps/unix/sysdep.h>
115
116#undef SYS_ify
117#define SYS_ify(syscall_name) __NR_##syscall_name
118
119#if __WORDSIZE == 32
120/* Workarounds for generic code needing to handle 64-bit time_t. */
121#define __NR_clock_getres __NR_clock_getres_time64
122#define __NR_futex __NR_futex_time64
123#define __NR_ppoll __NR_ppoll_time64
124#define __NR_pselect6 __NR_pselect6_time64
125#define __NR_recvmmsg __NR_recvmmsg_time64
126#define __NR_rt_sigtimedwait __NR_rt_sigtimedwait_time64
127#define __NR_semtimedop __NR_semtimedop_time64
128#define __NR_utimensat __NR_utimensat_time64
129#endif /* __WORDSIZE == 32 */
130
131#ifndef __ASSEMBLER__
132
133#define VDSO_NAME "LINUX_5.10"
134#define VDSO_HASH 182947696
135
136/* List of system calls which are supported as vsyscalls. */
137#define HAVE_CLOCK_GETRES64_VSYSCALL "__vdso_clock_getres"
138#define HAVE_CLOCK_GETTIME64_VSYSCALL "__vdso_clock_gettime"
139#define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday"
140#define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
141#define HAVE_GETRANDOM_VSYSCALL "__vdso_getrandom"
142
143#define HAVE_CLONE3_WRAPPER 1
144
145#define INTERNAL_SYSCALL(name, nr, args...) \
146 internal_syscall##nr (SYS_ify (name), args)
147
148#define INTERNAL_SYSCALL_NCS(number, nr, args...) \
149 internal_syscall##nr (number, args)
150
151#define internal_syscall0(number, dummy...) \
152 ({ \
153 long int _sys_result; \
154\
155 { \
156 register long int __a7 asm ("$a7") = number; \
157 register long int __a0 asm ("$a0"); \
158 __asm__ volatile ("syscall 0\n\t" \
159 : "=r"(__a0) \
160 : "r"(__a7) \
161 : __SYSCALL_CLOBBERS); \
162 _sys_result = __a0; \
163 } \
164 _sys_result; \
165 })
166
167#define internal_syscall1(number, arg0) \
168 ({ \
169 long int _sys_result; \
170\
171 { \
172 long int _arg0 = (long int) (arg0); \
173 register long int __a7 asm ("$a7") = number; \
174 register long int __a0 asm ("$a0") = _arg0; \
175 __asm__ volatile ("syscall 0\n\t" \
176 : "+r"(__a0) \
177 : "r"(__a7) \
178 : __SYSCALL_CLOBBERS); \
179 _sys_result = __a0; \
180 } \
181 _sys_result; \
182 })
183
184#define internal_syscall2(number, arg0, arg1) \
185 ({ \
186 long int _sys_result; \
187\
188 { \
189 long int _arg0 = (long int) (arg0); \
190 long int _arg1 = (long int) (arg1); \
191 register long int __a7 asm ("$a7") = number; \
192 register long int __a0 asm ("$a0") = _arg0; \
193 register long int __a1 asm ("$a1") = _arg1; \
194 __asm__ volatile ("syscall 0\n\t" \
195 : "+r"(__a0) \
196 : "r"(__a7), "r"(__a1) \
197 : __SYSCALL_CLOBBERS); \
198 _sys_result = __a0; \
199 } \
200 _sys_result; \
201 })
202
203#define internal_syscall3(number, arg0, arg1, arg2) \
204 ({ \
205 long int _sys_result; \
206\
207 { \
208 long int _arg0 = (long int) (arg0); \
209 long int _arg1 = (long int) (arg1); \
210 long int _arg2 = (long int) (arg2); \
211 register long int __a7 asm ("$a7") = number; \
212 register long int __a0 asm ("$a0") = _arg0; \
213 register long int __a1 asm ("$a1") = _arg1; \
214 register long int __a2 asm ("$a2") = _arg2; \
215 __asm__ volatile ("syscall 0\n\t" \
216 : "+r"(__a0) \
217 : "r"(__a7), "r"(__a1), "r"(__a2) \
218 : __SYSCALL_CLOBBERS); \
219 _sys_result = __a0; \
220 } \
221 _sys_result; \
222 })
223
224#define internal_syscall4(number, arg0, arg1, arg2, arg3) \
225 ({ \
226 long int _sys_result; \
227\
228 { \
229 long int _arg0 = (long int) (arg0); \
230 long int _arg1 = (long int) (arg1); \
231 long int _arg2 = (long int) (arg2); \
232 long int _arg3 = (long int) (arg3); \
233 register long int __a7 asm ("$a7") = number; \
234 register long int __a0 asm ("$a0") = _arg0; \
235 register long int __a1 asm ("$a1") = _arg1; \
236 register long int __a2 asm ("$a2") = _arg2; \
237 register long int __a3 asm ("$a3") = _arg3; \
238 __asm__ volatile ("syscall 0\n\t" \
239 : "+r"(__a0) \
240 : "r"(__a7), "r"(__a1), "r"(__a2), "r"(__a3) \
241 : __SYSCALL_CLOBBERS); \
242 _sys_result = __a0; \
243 } \
244 _sys_result; \
245 })
246
247#define internal_syscall5(number, arg0, arg1, arg2, arg3, arg4) \
248 ({ \
249 long int _sys_result; \
250\
251 { \
252 long int _arg0 = (long int) (arg0); \
253 long int _arg1 = (long int) (arg1); \
254 long int _arg2 = (long int) (arg2); \
255 long int _arg3 = (long int) (arg3); \
256 long int _arg4 = (long int) (arg4); \
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 ("$a3") = _arg3; \
262 register long int __a4 asm ("$a4") = _arg4; \
263 __asm__ volatile ("syscall 0\n\t" \
264 : "+r"(__a0) \
265 : "r"(__a7), "r"(__a1), "r"(__a2), \
266 "r"(__a3), "r"(__a4) \
267 : __SYSCALL_CLOBBERS); \
268 _sys_result = __a0; \
269 } \
270 _sys_result; \
271 })
272
273#define internal_syscall6(number, arg0, arg1, arg2, arg3, arg4, arg5) \
274 ({ \
275 long int _sys_result; \
276\
277 { \
278 long int _arg0 = (long int) (arg0); \
279 long int _arg1 = (long int) (arg1); \
280 long int _arg2 = (long int) (arg2); \
281 long int _arg3 = (long int) (arg3); \
282 long int _arg4 = (long int) (arg4); \
283 long int _arg5 = (long int) (arg5); \
284 register long int __a7 asm ("$a7") = number; \
285 register long int __a0 asm ("$a0") = _arg0; \
286 register long int __a1 asm ("$a1") = _arg1; \
287 register long int __a2 asm ("$a2") = _arg2; \
288 register long int __a3 asm ("$a3") = _arg3; \
289 register long int __a4 asm ("$a4") = _arg4; \
290 register long int __a5 asm ("$a5") = _arg5; \
291 __asm__ volatile ("syscall 0\n\t" \
292 : "+r"(__a0) \
293 : "r"(__a7), "r"(__a1), "r"(__a2), "r"(__a3), \
294 "r"(__a4), "r"(__a5) \
295 : __SYSCALL_CLOBBERS); \
296 _sys_result = __a0; \
297 } \
298 _sys_result; \
299 })
300
301#define internal_syscall7(number, arg0, arg1, arg2, arg3, arg4, arg5, arg6) \
302 ({ \
303 long int _sys_result; \
304\
305 { \
306 long int _arg0 = (long int) (arg0); \
307 long int _arg1 = (long int) (arg1); \
308 long int _arg2 = (long int) (arg2); \
309 long int _arg3 = (long int) (arg3); \
310 long int _arg4 = (long int) (arg4); \
311 long int _arg5 = (long int) (arg5); \
312 long int _arg6 = (long int) (arg6); \
313 register long int __a7 asm ("$a7") = number; \
314 register long int __a0 asm ("$a0") = _arg0; \
315 register long int __a1 asm ("$a1") = _arg1; \
316 register long int __a2 asm ("$a2") = _arg2; \
317 register long int __a3 asm ("$a3") = _arg3; \
318 register long int __a4 asm ("$a4") = _arg4; \
319 register long int __a5 asm ("$a5") = _arg5; \
320 register long int __a6 asm ("$a6") = _arg6; \
321 __asm__ volatile ("syscall 0\n\t" \
322 : "+r"(__a0) \
323 : "r"(__a7), "r"(__a1), "r"(__a2), "r"(__a3), \
324 "r"(__a4), "r"(__a5), "r"(__a6) \
325 : __SYSCALL_CLOBBERS); \
326 _sys_result = __a0; \
327 } \
328 _sys_result; \
329 })
330
331#define __SYSCALL_CLOBBERS \
332 "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "memory"
333
334extern long int __syscall_error (long int neg_errno);
335
336#endif /* ! __ASSEMBLER__ */
337
338#endif /* linux/loongarch/sysdep.h */