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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/generic/sysdep.h>
23#include <tls.h>
24
25#undef SYS_ify
26#define SYS_ify(syscall_name) __NR_##syscall_name
27
28#if __WORDSIZE == 32
29
30/* Workarounds for generic code needing to handle 64-bit time_t. */
31
32/* Fix sysdeps/unix/sysv/linux/clock_getcpuclockid.c. */
33#define __NR_clock_getres __NR_clock_getres_time64
34/* Fix sysdeps/nptl/lowlevellock-futex.h. */
35#define __NR_futex __NR_futex_time64
36/* Fix sysdeps/unix/sysv/linux/pause.c. */
37#define __NR_ppoll __NR_ppoll_time64
38/* Fix sysdeps/unix/sysv/linux/select.c. */
39#define __NR_pselect6 __NR_pselect6_time64
40/* Fix sysdeps/unix/sysv/linux/recvmmsg.c. */
41#define __NR_recvmmsg __NR_recvmmsg_time64
42/* Fix sysdeps/unix/sysv/linux/sigtimedwait.c. */
43#define __NR_rt_sigtimedwait __NR_rt_sigtimedwait_time64
44/* Fix sysdeps/unix/sysv/linux/semtimedop.c. */
45#define __NR_semtimedop __NR_semtimedop_time64
46/* Hack sysdeps/unix/sysv/linux/generic/utimes.c. */
47#define __NR_utimensat __NR_utimensat_time64
48
49#endif /* __WORDSIZE == 32 */
50
51#ifdef __ASSEMBLER__
52
53# include <sys/asm.h>
54
55# define ENTRY(name) LEAF(name)
56
57# define L(label) .L ## label
58
59/* Performs a system call, handling errors by setting errno. Linux indicates
60 errors by setting a0 to a value between -1 and -4095. */
61# undef PSEUDO
62# define PSEUDO(name, syscall_name, args) \
63 .text; \
64 .align 2; \
65 ENTRY (name); \
66 li a7, SYS_ify (syscall_name); \
67 scall; \
68 li a7, -4096; \
69 bgtu a0, a7, .Lsyscall_error ## name;
70
71# undef PSEUDO_END
72# define PSEUDO_END(sym) \
73 SYSCALL_ERROR_HANDLER (sym) \
74 ret; \
75 END (sym)
76
77# if !IS_IN (libc)
78# if RTLD_PRIVATE_ERRNO
79# define SYSCALL_ERROR_HANDLER(name) \
80.Lsyscall_error ## name: \
81 li t1, -4096; \
82 neg a0, a0; \
83 sw a0, rtld_errno, t1; \
84 li a0, -1;
85# elif defined (__PIC__)
86# define SYSCALL_ERROR_HANDLER(name) \
87.Lsyscall_error ## name: \
88 la.tls.ie t1, errno; \
89 add t1, t1, tp; \
90 neg a0, a0; \
91 sw a0, 0(t1); \
92 li a0, -1;
93# else
94# define SYSCALL_ERROR_HANDLER(name) \
95.Lsyscall_error ## name: \
96 lui t1, %tprel_hi(errno); \
97 add t1, t1, tp, %tprel_add(errno); \
98 neg a0, a0; \
99 sw a0, %tprel_lo(errno)(t1); \
100 li a0, -1;
101# endif
102# else
103# define SYSCALL_ERROR_HANDLER(name) \
104.Lsyscall_error ## name: \
105 j __syscall_error;
106# endif
107
108/* Performs a system call, not setting errno. */
109# undef PSEUDO_NEORRNO
110# define PSEUDO_NOERRNO(name, syscall_name, args) \
111 .align 2; \
112 ENTRY (name); \
113 li a7, SYS_ify (syscall_name); \
114 scall;
115
116# undef PSEUDO_END_NOERRNO
117# define PSEUDO_END_NOERRNO(name) \
118 END (name)
119
120# undef ret_NOERRNO
121# define ret_NOERRNO ret
122
123/* Perfroms a system call, returning the error code. */
124# undef PSEUDO_ERRVAL
125# define PSEUDO_ERRVAL(name, syscall_name, args) \
126 PSEUDO_NOERRNO (name, syscall_name, args) \
127 neg a0, a0;
128
129# undef PSEUDO_END_ERRVAL
130# define PSEUDO_END_ERRVAL(name) \
131 END (name)
132
133# undef ret_ERRVAL
134# define ret_ERRVAL ret
135
136#else /* !__ASSEMBLER__ */
137
138# if __WORDSIZE == 64
139# define VDSO_NAME "LINUX_4.15"
140# define VDSO_HASH 182943605
141
142/* List of system calls which are supported as vsyscalls only
143 for RV64. */
144# define HAVE_CLOCK_GETRES64_VSYSCALL "__vdso_clock_getres"
145# define HAVE_CLOCK_GETTIME64_VSYSCALL "__vdso_clock_gettime"
146# define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday"
147# else
148# define VDSO_NAME "LINUX_5.4"
149# define VDSO_HASH 61765876
150
151/* RV32 does not support the gettime VDSO syscalls. */
152# endif
153
154/* List of system calls which are supported as vsyscalls (for RV32 and
155 RV64). */
156# define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
157
158# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
159# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
160
161# define INTERNAL_SYSCALL(name, nr, args...) \
162 internal_syscall##nr (SYS_ify (name), args)
163
164# define INTERNAL_SYSCALL_NCS(number, nr, args...) \
165 internal_syscall##nr (number, args)
166
167# define internal_syscall0(number, dummy...) \
168({ \
169 long int _sys_result; \
170 \
171 { \
172 register long int __a7 asm ("a7") = number; \
173 register long int __a0 asm ("a0"); \
174 __asm__ volatile ( \
175 "scall\n\t" \
176 : "=r" (__a0) \
177 : "r" (__a7) \
178 : __SYSCALL_CLOBBERS); \
179 _sys_result = __a0; \
180 } \
181 _sys_result; \
182})
183
184# define internal_syscall1(number, arg0) \
185({ \
186 long int _sys_result; \
187 long int _arg0 = (long int) (arg0); \
188 \
189 { \
190 register long int __a7 asm ("a7") = number; \
191 register long int __a0 asm ("a0") = _arg0; \
192 __asm__ volatile ( \
193 "scall\n\t" \
194 : "+r" (__a0) \
195 : "r" (__a7) \
196 : __SYSCALL_CLOBBERS); \
197 _sys_result = __a0; \
198 } \
199 _sys_result; \
200})
201
202# define internal_syscall2(number, arg0, arg1) \
203({ \
204 long int _sys_result; \
205 long int _arg0 = (long int) (arg0); \
206 long int _arg1 = (long int) (arg1); \
207 \
208 { \
209 register long int __a7 asm ("a7") = number; \
210 register long int __a0 asm ("a0") = _arg0; \
211 register long int __a1 asm ("a1") = _arg1; \
212 __asm__ volatile ( \
213 "scall\n\t" \
214 : "+r" (__a0) \
215 : "r" (__a7), "r" (__a1) \
216 : __SYSCALL_CLOBBERS); \
217 _sys_result = __a0; \
218 } \
219 _sys_result; \
220})
221
222# define internal_syscall3(number, arg0, arg1, arg2) \
223({ \
224 long int _sys_result; \
225 long int _arg0 = (long int) (arg0); \
226 long int _arg1 = (long int) (arg1); \
227 long int _arg2 = (long int) (arg2); \
228 \
229 { \
230 register long int __a7 asm ("a7") = number; \
231 register long int __a0 asm ("a0") = _arg0; \
232 register long int __a1 asm ("a1") = _arg1; \
233 register long int __a2 asm ("a2") = _arg2; \
234 __asm__ volatile ( \
235 "scall\n\t" \
236 : "+r" (__a0) \
237 : "r" (__a7), "r" (__a1), "r" (__a2) \
238 : __SYSCALL_CLOBBERS); \
239 _sys_result = __a0; \
240 } \
241 _sys_result; \
242})
243
244# define internal_syscall4(number, arg0, arg1, arg2, arg3) \
245({ \
246 long int _sys_result; \
247 long int _arg0 = (long int) (arg0); \
248 long int _arg1 = (long int) (arg1); \
249 long int _arg2 = (long int) (arg2); \
250 long int _arg3 = (long int) (arg3); \
251 \
252 { \
253 register long int __a7 asm ("a7") = number; \
254 register long int __a0 asm ("a0") = _arg0; \
255 register long int __a1 asm ("a1") = _arg1; \
256 register long int __a2 asm ("a2") = _arg2; \
257 register long int __a3 asm ("a3") = _arg3; \
258 __asm__ volatile ( \
259 "scall\n\t" \
260 : "+r" (__a0) \
261 : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3) \
262 : __SYSCALL_CLOBBERS); \
263 _sys_result = __a0; \
264 } \
265 _sys_result; \
266})
267
268# define internal_syscall5(number, arg0, arg1, arg2, arg3, arg4) \
269({ \
270 long int _sys_result; \
271 long int _arg0 = (long int) (arg0); \
272 long int _arg1 = (long int) (arg1); \
273 long int _arg2 = (long int) (arg2); \
274 long int _arg3 = (long int) (arg3); \
275 long int _arg4 = (long int) (arg4); \
276 \
277 { \
278 register long int __a7 asm ("a7") = number; \
279 register long int __a0 asm ("a0") = _arg0; \
280 register long int __a1 asm ("a1") = _arg1; \
281 register long int __a2 asm ("a2") = _arg2; \
282 register long int __a3 asm ("a3") = _arg3; \
283 register long int __a4 asm ("a4") = _arg4; \
284 __asm__ volatile ( \
285 "scall\n\t" \
286 : "+r" (__a0) \
287 : "r" (__a7), "r"(__a1), "r"(__a2), "r"(__a3), "r" (__a4) \
288 : __SYSCALL_CLOBBERS); \
289 _sys_result = __a0; \
290 } \
291 _sys_result; \
292})
293
294# define internal_syscall6(number, arg0, arg1, arg2, arg3, arg4, arg5) \
295({ \
296 long int _sys_result; \
297 long int _arg0 = (long int) (arg0); \
298 long int _arg1 = (long int) (arg1); \
299 long int _arg2 = (long int) (arg2); \
300 long int _arg3 = (long int) (arg3); \
301 long int _arg4 = (long int) (arg4); \
302 long int _arg5 = (long int) (arg5); \
303 \
304 { \
305 register long int __a7 asm ("a7") = number; \
306 register long int __a0 asm ("a0") = _arg0; \
307 register long int __a1 asm ("a1") = _arg1; \
308 register long int __a2 asm ("a2") = _arg2; \
309 register long int __a3 asm ("a3") = _arg3; \
310 register long int __a4 asm ("a4") = _arg4; \
311 register long int __a5 asm ("a5") = _arg5; \
312 __asm__ volatile ( \
313 "scall\n\t" \
314 : "+r" (__a0) \
315 : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3), \
316 "r" (__a4), "r" (__a5) \
317 : __SYSCALL_CLOBBERS); \
318 _sys_result = __a0; \
319 } \
320 _sys_result; \
321})
322
323# define internal_syscall7(number, arg0, arg1, arg2, arg3, arg4, arg5, arg6) \
324({ \
325 long int _sys_result; \
326 long int _arg0 = (long int) (arg0); \
327 long int _arg1 = (long int) (arg1); \
328 long int _arg2 = (long int) (arg2); \
329 long int _arg3 = (long int) (arg3); \
330 long int _arg4 = (long int) (arg4); \
331 long int _arg5 = (long int) (arg5); \
332 long int _arg6 = (long int) (arg6); \
333 \
334 { \
335 register long int __a7 asm ("a7") = number; \
336 register long int __a0 asm ("a0") = _arg0; \
337 register long int __a1 asm ("a1") = _arg1; \
338 register long int __a2 asm ("a2") = _arg2; \
339 register long int __a3 asm ("a3") = _arg3; \
340 register long int __a4 asm ("a4") = _arg4; \
341 register long int __a5 asm ("a5") = _arg5; \
342 register long int __a6 asm ("a6") = _arg6; \
343 __asm__ volatile ( \
344 "scall\n\t" \
345 : "+r" (__a0) \
346 : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3), \
347 "r" (__a4), "r" (__a5), "r" (__a6) \
348 : __SYSCALL_CLOBBERS); \
349 _sys_result = __a0; \
350 } \
351 _sys_result; \
352})
353
354# define __SYSCALL_CLOBBERS "memory"
355
356extern long int __syscall_error (long int neg_errno);
357
358#endif /* ! __ASSEMBLER__ */
359
360/* Pointer mangling is not supported. */
361#define PTR_MANGLE(var) (void) (var)
362#define PTR_DEMANGLE(var) (void) (var)
363
364#endif /* linux/riscv/sysdep.h */
365

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source code of glibc/sysdeps/unix/sysv/linux/riscv/sysdep.h