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1 /* Copyright (C) 1992, 1995, 1996, 2000, 2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Brendan Kehoe (brendan@zen.org).
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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
19
20 #include <sysdeps/unix/sysdep.h>
21
22 #ifdef __ASSEMBLER__
23
24 #ifdef __linux__
25 # include <alpha/regdef.h>
26 #else
27 # include <regdef.h>
28 #endif
29
30 #include <tls.h> /* Defines USE___THREAD. */
31
32 #ifdef IS_IN_rtld
33 # include <dl-sysdep.h> /* Defines RTLD_PRIVATE_ERRNO. */
34 #endif
35
36
37 #ifdef __STDC__
38 #define __LABEL(x) x##:
39 #else
40 #define __LABEL(x) x/**/:
41 #endif
42
43 #define LEAF(name, framesize) \
44 .globl name; \
45 .align 3; \
46 .ent name, 0; \
47 __LABEL(name) \
48 .frame sp, framesize, ra
49
50 #define ENTRY(name) \
51 .globl name; \
52 .align 3; \
53 .ent name, 0; \
54 __LABEL(name) \
55 .frame sp, 0, ra
56
57 /* Mark the end of function SYM. */
58 #undef END
59 #define END(sym) .end sym
60
61 #ifdef PROF
62 # define PSEUDO_PROLOGUE \
63 .frame sp, 0, ra; \
64 ldgp gp,0(pv); \
65 .set noat; \
66 lda AT,_mcount; \
67 jsr AT,(AT),_mcount; \
68 .set at; \
69 .prologue 1
70 #elif defined PIC
71 # define PSEUDO_PROLOGUE \
72 .frame sp, 0, ra; \
73 .prologue 0
74 #else
75 # define PSEUDO_PROLOGUE \
76 .frame sp, 0, ra; \
77 ldgp gp,0(pv); \
78 .prologue 1
79 #endif /* PROF */
80
81 #if RTLD_PRIVATE_ERRNO
82 # define SYSCALL_ERROR_LABEL $syscall_error
83 # define SYSCALL_ERROR_HANDLER \
84 stl v0, errno(gp) !gprel; \
85 lda v0, -1; \
86 ret
87 #elif defined(PIC)
88 # define SYSCALL_ERROR_LABEL __syscall_error
89 # define SYSCALL_ERROR_HANDLER \
90 br $31, __syscall_error !samegp
91 #else
92 # define SYSCALL_ERROR_LABEL $syscall_error
93 # define SYSCALL_ERROR_HANDLER \
94 jmp $31, __syscall_error
95 #endif /* RTLD_PRIVATE_ERRNO */
96
97 /* Overridden by specific syscalls. */
98 #undef PSEUDO_PREPARE_ARGS
99 #define PSEUDO_PREPARE_ARGS /* Nothing. */
100
101 #define PSEUDO(name, syscall_name, args) \
102 .globl name; \
103 .align 4; \
104 .ent name,0; \
105 __LABEL(name) \
106 PSEUDO_PROLOGUE; \
107 PSEUDO_PREPARE_ARGS \
108 lda v0, SYS_ify(syscall_name); \
109 call_pal PAL_callsys; \
110 bne a3, SYSCALL_ERROR_LABEL
111
112 #undef PSEUDO_END
113 #if defined(PIC) && !RTLD_PRIVATE_ERRNO
114 # define PSEUDO_END(sym) END(sym)
115 #else
116 # define PSEUDO_END(sym) \
117 $syscall_error: \
118 SYSCALL_ERROR_HANDLER; \
119 END(sym)
120 #endif
121
122 #define PSEUDO_NOERRNO(name, syscall_name, args) \
123 .globl name; \
124 .align 4; \
125 .ent name,0; \
126 __LABEL(name) \
127 PSEUDO_PROLOGUE; \
128 PSEUDO_PREPARE_ARGS \
129 lda v0, SYS_ify(syscall_name); \
130 call_pal PAL_callsys;
131
132 #undef PSEUDO_END_NOERRNO
133 #define PSEUDO_END_NOERRNO(sym) END(sym)
134
135 #define ret_NOERRNO ret
136
137 #define PSEUDO_ERRVAL(name, syscall_name, args) \
138 .globl name; \
139 .align 4; \
140 .ent name,0; \
141 __LABEL(name) \
142 PSEUDO_PROLOGUE; \
143 PSEUDO_PREPARE_ARGS \
144 lda v0, SYS_ify(syscall_name); \
145 call_pal PAL_callsys;
146
147 #undef PSEUDO_END_ERRVAL
148 #define PSEUDO_END_ERRVAL(sym) END(sym)
149
150 #define ret_ERRVAL ret
151
152 #define r0 v0
153 #define r1 a4
154
155 #define MOVE(x,y) mov x,y
156
157 #else /* !ASSEMBLER */
158
159 /* ??? Linux needs to be able to override INLINE_SYSCALL for one
160 particular special case. Make this easy. */
161
162 #undef INLINE_SYSCALL
163 #define INLINE_SYSCALL(name, nr, args...) \
164 INLINE_SYSCALL1(name, nr, args)
165
166 #define INLINE_SYSCALL1(name, nr, args...) \
167 ({ \
168 long _sc_ret, _sc_err; \
169 inline_syscall##nr(name, args); \
170 if (__builtin_expect (_sc_err, 0)) \
171 { \
172 __set_errno (_sc_ret); \
173 _sc_ret = -1L; \
174 } \
175 _sc_ret; \
176 })
177
178 #define INTERNAL_SYSCALL(name, err_out, nr, args...) \
179 INTERNAL_SYSCALL1(name, err_out, nr, args)
180
181 #define INTERNAL_SYSCALL1(name, err_out, nr, args...) \
182 ({ \
183 long _sc_ret, _sc_err; \
184 inline_syscall##nr(name, args); \
185 err_out = _sc_err; \
186 _sc_ret; \
187 })
188
189 #define INTERNAL_SYSCALL_DECL(err) long int err
190 #define INTERNAL_SYSCALL_ERROR_P(val, err) err
191 #define INTERNAL_SYSCALL_ERRNO(val, err) val
192
193 #define inline_syscall_clobbers \
194 "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", \
195 "$22", "$23", "$24", "$25", "$27", "$28", "memory"
196
197 /* If TLS is in use, we have a conflict between the PAL_rduniq primitive,
198 as modeled within GCC, and explicit use of the R0 register. If we use
199 the register via the asm, the scheduler may place the PAL_rduniq insn
200 before we've copied the data from R0 into _sc_ret. If this happens
201 we'll get a reload abort, since R0 is live at the same time it is
202 needed for the PAL_rduniq.
203
204 Solve this by using the "v" constraint instead of an asm for the syscall
205 output. We don't do this unconditionally to allow compilation with
206 older compilers. */
207
208 #ifdef USE_TLS
209 #define inline_syscall_r0_asm
210 #define inline_syscall_r0_out_constraint "=v"
211 #else
212 #define inline_syscall_r0_asm __asm__("$0")
213 #define inline_syscall_r0_out_constraint "=r"
214 #endif
215
216 /* It is moderately important optimization-wise to limit the lifetime
217 of the hard-register variables as much as possible. Thus we copy
218 in/out as close to the asm as possible. */
219
220 #define inline_syscall0(name, args...) \
221 { \
222 register long _sc_0 inline_syscall_r0_asm; \
223 register long _sc_19 __asm__("$19"); \
224 \
225 _sc_0 = __NR_##name; \
226 __asm__ __volatile__ \
227 ("callsys # %0 %1 <= %2" \
228 : inline_syscall_r0_out_constraint (_sc_0), \
229 "=r"(_sc_19) \
230 : "0"(_sc_0) \
231 : inline_syscall_clobbers, \
232 "$16", "$17", "$18", "$20", "$21"); \
233 _sc_ret = _sc_0, _sc_err = _sc_19; \
234 }
235
236 #define inline_syscall1(name,arg1) \
237 { \
238 register long _sc_0 inline_syscall_r0_asm; \
239 register long _sc_16 __asm__("$16"); \
240 register long _sc_19 __asm__("$19"); \
241 \
242 _sc_0 = __NR_##name; \
243 _sc_16 = (long) (arg1); \
244 __asm__ __volatile__ \
245 ("callsys # %0 %1 <= %2 %3" \
246 : inline_syscall_r0_out_constraint (_sc_0), \
247 "=r"(_sc_19), "=r"(_sc_16) \
248 : "0"(_sc_0), "2"(_sc_16) \
249 : inline_syscall_clobbers, \
250 "$17", "$18", "$20", "$21"); \
251 _sc_ret = _sc_0, _sc_err = _sc_19; \
252 }
253
254 #define inline_syscall2(name,arg1,arg2) \
255 { \
256 register long _sc_0 inline_syscall_r0_asm; \
257 register long _sc_16 __asm__("$16"); \
258 register long _sc_17 __asm__("$17"); \
259 register long _sc_19 __asm__("$19"); \
260 \
261 _sc_0 = __NR_##name; \
262 _sc_16 = (long) (arg1); \
263 _sc_17 = (long) (arg2); \
264 __asm__ __volatile__ \
265 ("callsys # %0 %1 <= %2 %3 %4" \
266 : inline_syscall_r0_out_constraint (_sc_0), \
267 "=r"(_sc_19), "=r"(_sc_16), "=r"(_sc_17) \
268 : "0"(_sc_0), "2"(_sc_16), "3"(_sc_17) \
269 : inline_syscall_clobbers, \
270 "$18", "$20", "$21"); \
271 _sc_ret = _sc_0, _sc_err = _sc_19; \
272 }
273
274 #define inline_syscall3(name,arg1,arg2,arg3) \
275 { \
276 register long _sc_0 inline_syscall_r0_asm; \
277 register long _sc_16 __asm__("$16"); \
278 register long _sc_17 __asm__("$17"); \
279 register long _sc_18 __asm__("$18"); \
280 register long _sc_19 __asm__("$19"); \
281 \
282 _sc_0 = __NR_##name; \
283 _sc_16 = (long) (arg1); \
284 _sc_17 = (long) (arg2); \
285 _sc_18 = (long) (arg3); \
286 __asm__ __volatile__ \
287 ("callsys # %0 %1 <= %2 %3 %4 %5" \
288 : inline_syscall_r0_out_constraint (_sc_0), \
289 "=r"(_sc_19), "=r"(_sc_16), "=r"(_sc_17), \
290 "=r"(_sc_18) \
291 : "0"(_sc_0), "2"(_sc_16), "3"(_sc_17), \
292 "4"(_sc_18) \
293 : inline_syscall_clobbers, "$20", "$21"); \
294 _sc_ret = _sc_0, _sc_err = _sc_19; \
295 }
296
297 #define inline_syscall4(name,arg1,arg2,arg3,arg4) \
298 { \
299 register long _sc_0 inline_syscall_r0_asm; \
300 register long _sc_16 __asm__("$16"); \
301 register long _sc_17 __asm__("$17"); \
302 register long _sc_18 __asm__("$18"); \
303 register long _sc_19 __asm__("$19"); \
304 \
305 _sc_0 = __NR_##name; \
306 _sc_16 = (long) (arg1); \
307 _sc_17 = (long) (arg2); \
308 _sc_18 = (long) (arg3); \
309 _sc_19 = (long) (arg4); \
310 __asm__ __volatile__ \
311 ("callsys # %0 %1 <= %2 %3 %4 %5 %6" \
312 : inline_syscall_r0_out_constraint (_sc_0), \
313 "=r"(_sc_19), "=r"(_sc_16), "=r"(_sc_17), \
314 "=r"(_sc_18) \
315 : "0"(_sc_0), "2"(_sc_16), "3"(_sc_17), \
316 "4"(_sc_18), "1"(_sc_19) \
317 : inline_syscall_clobbers, "$20", "$21"); \
318 _sc_ret = _sc_0, _sc_err = _sc_19; \
319 }
320
321 #define inline_syscall5(name,arg1,arg2,arg3,arg4,arg5) \
322 { \
323 register long _sc_0 inline_syscall_r0_asm; \
324 register long _sc_16 __asm__("$16"); \
325 register long _sc_17 __asm__("$17"); \
326 register long _sc_18 __asm__("$18"); \
327 register long _sc_19 __asm__("$19"); \
328 register long _sc_20 __asm__("$20"); \
329 \
330 _sc_0 = __NR_##name; \
331 _sc_16 = (long) (arg1); \
332 _sc_17 = (long) (arg2); \
333 _sc_18 = (long) (arg3); \
334 _sc_19 = (long) (arg4); \
335 _sc_20 = (long) (arg5); \
336 __asm__ __volatile__ \
337 ("callsys # %0 %1 <= %2 %3 %4 %5 %6 %7" \
338 : inline_syscall_r0_out_constraint (_sc_0), \
339 "=r"(_sc_19), "=r"(_sc_16), "=r"(_sc_17), \
340 "=r"(_sc_18), "=r"(_sc_20) \
341 : "0"(_sc_0), "2"(_sc_16), "3"(_sc_17), \
342 "4"(_sc_18), "1"(_sc_19), "5"(_sc_20) \
343 : inline_syscall_clobbers, "$21"); \
344 _sc_ret = _sc_0, _sc_err = _sc_19; \
345 }
346
347 #define inline_syscall6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
348 { \
349 register long _sc_0 inline_syscall_r0_asm; \
350 register long _sc_16 __asm__("$16"); \
351 register long _sc_17 __asm__("$17"); \
352 register long _sc_18 __asm__("$18"); \
353 register long _sc_19 __asm__("$19"); \
354 register long _sc_20 __asm__("$20"); \
355 register long _sc_21 __asm__("$21"); \
356 \
357 _sc_0 = __NR_##name; \
358 _sc_16 = (long) (arg1); \
359 _sc_17 = (long) (arg2); \
360 _sc_18 = (long) (arg3); \
361 _sc_19 = (long) (arg4); \
362 _sc_20 = (long) (arg5); \
363 _sc_21 = (long) (arg6); \
364 __asm__ __volatile__ \
365 ("callsys # %0 %1 <= %2 %3 %4 %5 %6 %7 %8" \
366 : inline_syscall_r0_out_constraint (_sc_0), \
367 "=r"(_sc_19) "=r"(_sc_16), "=r"(_sc_17), \
368 "=r"(_sc_18), "=r"(_sc_20), "=r"(_sc_21) \
369 : "0"(_sc_0), "2"(_sc_16), "3"(_sc_17), "4"(_sc_18), \
370 "1"(_sc_19), "5"(_sc_20), "6"(_sc_21) \
371 : inline_syscall_clobbers); \
372 _sc_ret = _sc_0, _sc_err = _sc_19; \
373 }
374
375 #endif /* ASSEMBLER */
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