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[glibc.git] / nptl / sysdeps / unix / sysv / linux / x86_64 / lowlevellock.h
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1 /* Copyright (C) 2002-2004, 2006-2008, 2009 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <http://www.gnu.org/licenses/>. */
18
19 #ifndef _LOWLEVELLOCK_H
20 #define _LOWLEVELLOCK_H 1
21
22 #ifndef __ASSEMBLER__
23 # include <time.h>
24 # include <sys/param.h>
25 # include <bits/pthreadtypes.h>
26 # include <kernel-features.h>
27 # include <tcb-offsets.h>
28
29 # ifndef LOCK_INSTR
30 # ifdef UP
31 # define LOCK_INSTR /* nothing */
32 # else
33 # define LOCK_INSTR "lock;"
34 # endif
35 # endif
36 #else
37 # ifndef LOCK
38 # ifdef UP
39 # define LOCK
40 # else
41 # define LOCK lock
42 # endif
43 # endif
44 #endif
45
46 #define SYS_futex 202
47 #define FUTEX_WAIT 0
48 #define FUTEX_WAKE 1
49 #define FUTEX_CMP_REQUEUE 4
50 #define FUTEX_WAKE_OP 5
51 #define FUTEX_LOCK_PI 6
52 #define FUTEX_UNLOCK_PI 7
53 #define FUTEX_TRYLOCK_PI 8
54 #define FUTEX_WAIT_BITSET 9
55 #define FUTEX_WAKE_BITSET 10
56 #define FUTEX_WAIT_REQUEUE_PI 11
57 #define FUTEX_CMP_REQUEUE_PI 12
58 #define FUTEX_PRIVATE_FLAG 128
59 #define FUTEX_CLOCK_REALTIME 256
60
61 #define FUTEX_BITSET_MATCH_ANY 0xffffffff
62
63 #define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1)
64
65 /* Values for 'private' parameter of locking macros. Yes, the
66 definition seems to be backwards. But it is not. The bit will be
67 reversed before passing to the system call. */
68 #define LLL_PRIVATE 0
69 #define LLL_SHARED FUTEX_PRIVATE_FLAG
70
71 #ifndef __ASSEMBLER__
72
73 #if !defined NOT_IN_libc || defined IS_IN_rtld
74 /* In libc.so or ld.so all futexes are private. */
75 # ifdef __ASSUME_PRIVATE_FUTEX
76 # define __lll_private_flag(fl, private) \
77 ((fl) | FUTEX_PRIVATE_FLAG)
78 # else
79 # define __lll_private_flag(fl, private) \
80 ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex))
81 # endif
82 #else
83 # ifdef __ASSUME_PRIVATE_FUTEX
84 # define __lll_private_flag(fl, private) \
85 (((fl) | FUTEX_PRIVATE_FLAG) ^ (private))
86 # else
87 # define __lll_private_flag(fl, private) \
88 (__builtin_constant_p (private) \
89 ? ((private) == 0 \
90 ? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \
91 : (fl)) \
92 : ({ unsigned int __fl = ((private) ^ FUTEX_PRIVATE_FLAG); \
93 asm ("andl %%fs:%P1, %0" : "+r" (__fl) \
94 : "i" (offsetof (struct pthread, header.private_futex))); \
95 __fl | (fl); }))
96 # endif
97 #endif
98
99 /* Initializer for lock. */
100 #define LLL_LOCK_INITIALIZER (0)
101 #define LLL_LOCK_INITIALIZER_LOCKED (1)
102 #define LLL_LOCK_INITIALIZER_WAITERS (2)
103
104 /* Delay in spinlock loop. */
105 #define BUSY_WAIT_NOP asm ("rep; nop")
106
107
108 #define LLL_STUB_UNWIND_INFO_START \
109 ".section .eh_frame,\"a\",@progbits\n" \
110 "7:\t" ".long 9f-8f # Length of Common Information Entry\n" \
111 "8:\t" ".long 0x0 # CIE Identifier Tag\n\t" \
112 ".byte 0x1 # CIE Version\n\t" \
113 ".ascii \"zR\\0\" # CIE Augmentation\n\t" \
114 ".uleb128 0x1 # CIE Code Alignment Factor\n\t" \
115 ".sleb128 -8 # CIE Data Alignment Factor\n\t" \
116 ".byte 0x10 # CIE RA Column\n\t" \
117 ".uleb128 0x1 # Augmentation size\n\t" \
118 ".byte 0x1b # FDE Encoding (pcrel sdata4)\n\t" \
119 ".byte 0x12 # DW_CFA_def_cfa_sf\n\t" \
120 ".uleb128 0x7\n\t" \
121 ".sleb128 16\n\t" \
122 ".align 8\n" \
123 "9:\t" ".long 23f-10f # FDE Length\n" \
124 "10:\t" ".long 10b-7b # FDE CIE offset\n\t" \
125 ".long 1b-. # FDE initial location\n\t" \
126 ".long 6b-1b # FDE address range\n\t" \
127 ".uleb128 0x0 # Augmentation size\n\t" \
128 ".byte 0x16 # DW_CFA_val_expression\n\t" \
129 ".uleb128 0x10\n\t" \
130 ".uleb128 12f-11f\n" \
131 "11:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
132 ".sleb128 4b-1b\n"
133 #define LLL_STUB_UNWIND_INFO_END \
134 ".byte 0x16 # DW_CFA_val_expression\n\t" \
135 ".uleb128 0x10\n\t" \
136 ".uleb128 14f-13f\n" \
137 "13:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
138 ".sleb128 4b-2b\n" \
139 "14:\t" ".byte 0x40 + (3b-2b) # DW_CFA_advance_loc\n\t" \
140 ".byte 0x0e # DW_CFA_def_cfa_offset\n\t" \
141 ".uleb128 0\n\t" \
142 ".byte 0x16 # DW_CFA_val_expression\n\t" \
143 ".uleb128 0x10\n\t" \
144 ".uleb128 16f-15f\n" \
145 "15:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
146 ".sleb128 4b-3b\n" \
147 "16:\t" ".byte 0x40 + (4b-3b-1) # DW_CFA_advance_loc\n\t" \
148 ".byte 0x0e # DW_CFA_def_cfa_offset\n\t" \
149 ".uleb128 128\n\t" \
150 ".byte 0x16 # DW_CFA_val_expression\n\t" \
151 ".uleb128 0x10\n\t" \
152 ".uleb128 20f-17f\n" \
153 "17:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
154 ".sleb128 19f-18f\n\t" \
155 ".byte 0x0d # DW_OP_const4s\n" \
156 "18:\t" ".4byte 4b-.\n\t" \
157 ".byte 0x1c # DW_OP_minus\n\t" \
158 ".byte 0x0d # DW_OP_const4s\n" \
159 "19:\t" ".4byte 24f-.\n\t" \
160 ".byte 0x22 # DW_OP_plus\n" \
161 "20:\t" ".byte 0x40 + (5b-4b+1) # DW_CFA_advance_loc\n\t" \
162 ".byte 0x13 # DW_CFA_def_cfa_offset_sf\n\t" \
163 ".sleb128 16\n\t" \
164 ".byte 0x16 # DW_CFA_val_expression\n\t" \
165 ".uleb128 0x10\n\t" \
166 ".uleb128 22f-21f\n" \
167 "21:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
168 ".sleb128 4b-5b\n" \
169 "22:\t" ".align 8\n" \
170 "23:\t" ".previous\n"
171
172 /* Unwind info for
173 1: leaq ..., %rdi
174 2: subq $128, %rsp
175 3: callq ...
176 4: addq $128, %rsp
177 5: jmp 24f
178 6:
179 snippet. */
180 #define LLL_STUB_UNWIND_INFO_5 \
181 LLL_STUB_UNWIND_INFO_START \
182 "12:\t" ".byte 0x40 + (2b-1b) # DW_CFA_advance_loc\n\t" \
183 LLL_STUB_UNWIND_INFO_END
184
185 /* Unwind info for
186 1: leaq ..., %rdi
187 0: movq ..., %rdx
188 2: subq $128, %rsp
189 3: callq ...
190 4: addq $128, %rsp
191 5: jmp 24f
192 6:
193 snippet. */
194 #define LLL_STUB_UNWIND_INFO_6 \
195 LLL_STUB_UNWIND_INFO_START \
196 "12:\t" ".byte 0x40 + (0b-1b) # DW_CFA_advance_loc\n\t" \
197 ".byte 0x16 # DW_CFA_val_expression\n\t" \
198 ".uleb128 0x10\n\t" \
199 ".uleb128 26f-25f\n" \
200 "25:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
201 ".sleb128 4b-0b\n" \
202 "26:\t" ".byte 0x40 + (2b-0b) # DW_CFA_advance_loc\n\t" \
203 LLL_STUB_UNWIND_INFO_END
204
205
206 #define lll_futex_wait(futex, val, private) \
207 lll_futex_timed_wait(futex, val, NULL, private)
208
209
210 #define lll_futex_timed_wait(futex, val, timeout, private) \
211 ({ \
212 register const struct timespec *__to __asm ("r10") = timeout; \
213 int __status; \
214 register __typeof (val) _val __asm ("edx") = (val); \
215 __asm __volatile ("syscall" \
216 : "=a" (__status) \
217 : "0" (SYS_futex), "D" (futex), \
218 "S" (__lll_private_flag (FUTEX_WAIT, private)), \
219 "d" (_val), "r" (__to) \
220 : "memory", "cc", "r11", "cx"); \
221 __status; \
222 })
223
224
225 #define lll_futex_wake(futex, nr, private) \
226 do { \
227 int __ignore; \
228 register __typeof (nr) _nr __asm ("edx") = (nr); \
229 __asm __volatile ("syscall" \
230 : "=a" (__ignore) \
231 : "0" (SYS_futex), "D" (futex), \
232 "S" (__lll_private_flag (FUTEX_WAKE, private)), \
233 "d" (_nr) \
234 : "memory", "cc", "r10", "r11", "cx"); \
235 } while (0)
236
237
238 /* NB: in the lll_trylock macro we simply return the value in %eax
239 after the cmpxchg instruction. In case the operation succeded this
240 value is zero. In case the operation failed, the cmpxchg instruction
241 has loaded the current value of the memory work which is guaranteed
242 to be nonzero. */
243 #if defined NOT_IN_libc || defined UP
244 # define __lll_trylock_asm LOCK_INSTR "cmpxchgl %2, %1"
245 #else
246 # define __lll_trylock_asm "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \
247 "je 0f\n\t" \
248 "lock; cmpxchgl %2, %1\n\t" \
249 "jmp 1f\n\t" \
250 "0:\tcmpxchgl %2, %1\n\t" \
251 "1:"
252 #endif
253
254 #define lll_trylock(futex) \
255 ({ int ret; \
256 __asm __volatile (__lll_trylock_asm \
257 : "=a" (ret), "=m" (futex) \
258 : "r" (LLL_LOCK_INITIALIZER_LOCKED), "m" (futex), \
259 "0" (LLL_LOCK_INITIALIZER) \
260 : "memory"); \
261 ret; })
262
263 #define lll_robust_trylock(futex, id) \
264 ({ int ret; \
265 __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
266 : "=a" (ret), "=m" (futex) \
267 : "r" (id), "m" (futex), "0" (LLL_LOCK_INITIALIZER) \
268 : "memory"); \
269 ret; })
270
271 #define lll_cond_trylock(futex) \
272 ({ int ret; \
273 __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
274 : "=a" (ret), "=m" (futex) \
275 : "r" (LLL_LOCK_INITIALIZER_WAITERS), \
276 "m" (futex), "0" (LLL_LOCK_INITIALIZER) \
277 : "memory"); \
278 ret; })
279
280 #if defined NOT_IN_libc || defined UP
281 # define __lll_lock_asm_start LOCK_INSTR "cmpxchgl %4, %2\n\t" \
282 "jnz 1f\n\t"
283 #else
284 # define __lll_lock_asm_start "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \
285 "je 0f\n\t" \
286 "lock; cmpxchgl %4, %2\n\t" \
287 "jnz 1f\n\t" \
288 "jmp 24f\n" \
289 "0:\tcmpxchgl %4, %2\n\t" \
290 "jnz 1f\n\t"
291 #endif
292
293 #define lll_lock(futex, private) \
294 (void) \
295 ({ int ignore1, ignore2, ignore3; \
296 if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \
297 __asm __volatile (__lll_lock_asm_start \
298 ".subsection 1\n\t" \
299 ".type _L_lock_%=, @function\n" \
300 "_L_lock_%=:\n" \
301 "1:\tleaq %2, %%rdi\n" \
302 "2:\tsubq $128, %%rsp\n" \
303 "3:\tcallq __lll_lock_wait_private\n" \
304 "4:\taddq $128, %%rsp\n" \
305 "5:\tjmp 24f\n" \
306 "6:\t.size _L_lock_%=, 6b-1b\n\t" \
307 ".previous\n" \
308 LLL_STUB_UNWIND_INFO_5 \
309 "24:" \
310 : "=S" (ignore1), "=&D" (ignore2), "=m" (futex), \
311 "=a" (ignore3) \
312 : "0" (1), "m" (futex), "3" (0) \
313 : "cx", "r11", "cc", "memory"); \
314 else \
315 __asm __volatile (__lll_lock_asm_start \
316 ".subsection 1\n\t" \
317 ".type _L_lock_%=, @function\n" \
318 "_L_lock_%=:\n" \
319 "1:\tleaq %2, %%rdi\n" \
320 "2:\tsubq $128, %%rsp\n" \
321 "3:\tcallq __lll_lock_wait\n" \
322 "4:\taddq $128, %%rsp\n" \
323 "5:\tjmp 24f\n" \
324 "6:\t.size _L_lock_%=, 6b-1b\n\t" \
325 ".previous\n" \
326 LLL_STUB_UNWIND_INFO_5 \
327 "24:" \
328 : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \
329 "=a" (ignore3) \
330 : "1" (1), "m" (futex), "3" (0), "0" (private) \
331 : "cx", "r11", "cc", "memory"); \
332 }) \
333
334 #define lll_robust_lock(futex, id, private) \
335 ({ int result, ignore1, ignore2; \
336 __asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t" \
337 "jnz 1f\n\t" \
338 ".subsection 1\n\t" \
339 ".type _L_robust_lock_%=, @function\n" \
340 "_L_robust_lock_%=:\n" \
341 "1:\tleaq %2, %%rdi\n" \
342 "2:\tsubq $128, %%rsp\n" \
343 "3:\tcallq __lll_robust_lock_wait\n" \
344 "4:\taddq $128, %%rsp\n" \
345 "5:\tjmp 24f\n" \
346 "6:\t.size _L_robust_lock_%=, 6b-1b\n\t" \
347 ".previous\n" \
348 LLL_STUB_UNWIND_INFO_5 \
349 "24:" \
350 : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \
351 "=a" (result) \
352 : "1" (id), "m" (futex), "3" (0), "0" (private) \
353 : "cx", "r11", "cc", "memory"); \
354 result; })
355
356 #define lll_cond_lock(futex, private) \
357 (void) \
358 ({ int ignore1, ignore2, ignore3; \
359 __asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t" \
360 "jnz 1f\n\t" \
361 ".subsection 1\n\t" \
362 ".type _L_cond_lock_%=, @function\n" \
363 "_L_cond_lock_%=:\n" \
364 "1:\tleaq %2, %%rdi\n" \
365 "2:\tsubq $128, %%rsp\n" \
366 "3:\tcallq __lll_lock_wait\n" \
367 "4:\taddq $128, %%rsp\n" \
368 "5:\tjmp 24f\n" \
369 "6:\t.size _L_cond_lock_%=, 6b-1b\n\t" \
370 ".previous\n" \
371 LLL_STUB_UNWIND_INFO_5 \
372 "24:" \
373 : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \
374 "=a" (ignore3) \
375 : "1" (2), "m" (futex), "3" (0), "0" (private) \
376 : "cx", "r11", "cc", "memory"); \
377 })
378
379 #define lll_robust_cond_lock(futex, id, private) \
380 ({ int result, ignore1, ignore2; \
381 __asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t" \
382 "jnz 1f\n\t" \
383 ".subsection 1\n\t" \
384 ".type _L_robust_cond_lock_%=, @function\n" \
385 "_L_robust_cond_lock_%=:\n" \
386 "1:\tleaq %2, %%rdi\n" \
387 "2:\tsubq $128, %%rsp\n" \
388 "3:\tcallq __lll_robust_lock_wait\n" \
389 "4:\taddq $128, %%rsp\n" \
390 "5:\tjmp 24f\n" \
391 "6:\t.size _L_robust_cond_lock_%=, 6b-1b\n\t" \
392 ".previous\n" \
393 LLL_STUB_UNWIND_INFO_5 \
394 "24:" \
395 : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \
396 "=a" (result) \
397 : "1" (id | FUTEX_WAITERS), "m" (futex), "3" (0), \
398 "0" (private) \
399 : "cx", "r11", "cc", "memory"); \
400 result; })
401
402 #define lll_timedlock(futex, timeout, private) \
403 ({ int result, ignore1, ignore2, ignore3; \
404 __asm __volatile (LOCK_INSTR "cmpxchgl %1, %4\n\t" \
405 "jnz 1f\n\t" \
406 ".subsection 1\n\t" \
407 ".type _L_timedlock_%=, @function\n" \
408 "_L_timedlock_%=:\n" \
409 "1:\tleaq %4, %%rdi\n" \
410 "0:\tmovq %8, %%rdx\n" \
411 "2:\tsubq $128, %%rsp\n" \
412 "3:\tcallq __lll_timedlock_wait\n" \
413 "4:\taddq $128, %%rsp\n" \
414 "5:\tjmp 24f\n" \
415 "6:\t.size _L_timedlock_%=, 6b-1b\n\t" \
416 ".previous\n" \
417 LLL_STUB_UNWIND_INFO_6 \
418 "24:" \
419 : "=a" (result), "=D" (ignore1), "=S" (ignore2), \
420 "=&d" (ignore3), "=m" (futex) \
421 : "0" (0), "1" (1), "m" (futex), "m" (timeout), \
422 "2" (private) \
423 : "memory", "cx", "cc", "r10", "r11"); \
424 result; })
425
426 #define lll_robust_timedlock(futex, timeout, id, private) \
427 ({ int result, ignore1, ignore2, ignore3; \
428 __asm __volatile (LOCK_INSTR "cmpxchgl %1, %4\n\t" \
429 "jnz 1f\n\t" \
430 ".subsection 1\n\t" \
431 ".type _L_robust_timedlock_%=, @function\n" \
432 "_L_robust_timedlock_%=:\n" \
433 "1:\tleaq %4, %%rdi\n" \
434 "0:\tmovq %8, %%rdx\n" \
435 "2:\tsubq $128, %%rsp\n" \
436 "3:\tcallq __lll_robust_timedlock_wait\n" \
437 "4:\taddq $128, %%rsp\n" \
438 "5:\tjmp 24f\n" \
439 "6:\t.size _L_robust_timedlock_%=, 6b-1b\n\t" \
440 ".previous\n" \
441 LLL_STUB_UNWIND_INFO_6 \
442 "24:" \
443 : "=a" (result), "=D" (ignore1), "=S" (ignore2), \
444 "=&d" (ignore3), "=m" (futex) \
445 : "0" (0), "1" (id), "m" (futex), "m" (timeout), \
446 "2" (private) \
447 : "memory", "cx", "cc", "r10", "r11"); \
448 result; })
449
450 #if defined NOT_IN_libc || defined UP
451 # define __lll_unlock_asm_start LOCK_INSTR "decl %0\n\t" \
452 "jne 1f\n\t"
453 #else
454 # define __lll_unlock_asm_start "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \
455 "je 0f\n\t" \
456 "lock; decl %0\n\t" \
457 "jne 1f\n\t" \
458 "jmp 24f\n\t" \
459 "0:\tdecl %0\n\t" \
460 "jne 1f\n\t"
461 #endif
462
463 #define lll_unlock(futex, private) \
464 (void) \
465 ({ int ignore; \
466 if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \
467 __asm __volatile (__lll_unlock_asm_start \
468 ".subsection 1\n\t" \
469 ".type _L_unlock_%=, @function\n" \
470 "_L_unlock_%=:\n" \
471 "1:\tleaq %0, %%rdi\n" \
472 "2:\tsubq $128, %%rsp\n" \
473 "3:\tcallq __lll_unlock_wake_private\n" \
474 "4:\taddq $128, %%rsp\n" \
475 "5:\tjmp 24f\n" \
476 "6:\t.size _L_unlock_%=, 6b-1b\n\t" \
477 ".previous\n" \
478 LLL_STUB_UNWIND_INFO_5 \
479 "24:" \
480 : "=m" (futex), "=&D" (ignore) \
481 : "m" (futex) \
482 : "ax", "cx", "r11", "cc", "memory"); \
483 else \
484 __asm __volatile (__lll_unlock_asm_start \
485 ".subsection 1\n\t" \
486 ".type _L_unlock_%=, @function\n" \
487 "_L_unlock_%=:\n" \
488 "1:\tleaq %0, %%rdi\n" \
489 "2:\tsubq $128, %%rsp\n" \
490 "3:\tcallq __lll_unlock_wake\n" \
491 "4:\taddq $128, %%rsp\n" \
492 "5:\tjmp 24f\n" \
493 "6:\t.size _L_unlock_%=, 6b-1b\n\t" \
494 ".previous\n" \
495 LLL_STUB_UNWIND_INFO_5 \
496 "24:" \
497 : "=m" (futex), "=&D" (ignore) \
498 : "m" (futex), "S" (private) \
499 : "ax", "cx", "r11", "cc", "memory"); \
500 })
501
502 #define lll_robust_unlock(futex, private) \
503 do \
504 { \
505 int ignore; \
506 __asm __volatile (LOCK_INSTR "andl %2, %0\n\t" \
507 "jne 1f\n\t" \
508 ".subsection 1\n\t" \
509 ".type _L_robust_unlock_%=, @function\n" \
510 "_L_robust_unlock_%=:\n" \
511 "1:\tleaq %0, %%rdi\n" \
512 "2:\tsubq $128, %%rsp\n" \
513 "3:\tcallq __lll_unlock_wake\n" \
514 "4:\taddq $128, %%rsp\n" \
515 "5:\tjmp 24f\n" \
516 "6:\t.size _L_robust_unlock_%=, 6b-1b\n\t" \
517 ".previous\n" \
518 LLL_STUB_UNWIND_INFO_5 \
519 "24:" \
520 : "=m" (futex), "=&D" (ignore) \
521 : "i" (FUTEX_WAITERS), "m" (futex), \
522 "S" (private) \
523 : "ax", "cx", "r11", "cc", "memory"); \
524 } \
525 while (0)
526
527 #define lll_robust_dead(futex, private) \
528 do \
529 { \
530 int ignore; \
531 __asm __volatile (LOCK_INSTR "orl %3, (%2)\n\t" \
532 "syscall" \
533 : "=m" (futex), "=a" (ignore) \
534 : "D" (&(futex)), "i" (FUTEX_OWNER_DIED), \
535 "S" (__lll_private_flag (FUTEX_WAKE, private)), \
536 "1" (__NR_futex), "d" (1) \
537 : "cx", "r11", "cc", "memory"); \
538 } \
539 while (0)
540
541 /* Returns non-zero if error happened, zero if success. */
542 #define lll_futex_requeue(ftx, nr_wake, nr_move, mutex, val, private) \
543 ({ int __res; \
544 register int __nr_move __asm ("r10") = nr_move; \
545 register void *__mutex __asm ("r8") = mutex; \
546 register int __val __asm ("r9") = val; \
547 __asm __volatile ("syscall" \
548 : "=a" (__res) \
549 : "0" (__NR_futex), "D" ((void *) ftx), \
550 "S" (__lll_private_flag (FUTEX_CMP_REQUEUE, \
551 private)), "d" (nr_wake), \
552 "r" (__nr_move), "r" (__mutex), "r" (__val) \
553 : "cx", "r11", "cc", "memory"); \
554 __res < 0; })
555
556 #define lll_islocked(futex) \
557 (futex != LLL_LOCK_INITIALIZER)
558
559
560 /* The kernel notifies a process with uses CLONE_CLEARTID via futex
561 wakeup when the clone terminates. The memory location contains the
562 thread ID while the clone is running and is reset to zero
563 afterwards.
564
565 The macro parameter must not have any side effect. */
566 #define lll_wait_tid(tid) \
567 do { \
568 int __ignore; \
569 register __typeof (tid) _tid asm ("edx") = (tid); \
570 if (_tid != 0) \
571 __asm __volatile ("xorq %%r10, %%r10\n\t" \
572 "1:\tmovq %2, %%rax\n\t" \
573 "syscall\n\t" \
574 "cmpl $0, (%%rdi)\n\t" \
575 "jne 1b" \
576 : "=&a" (__ignore) \
577 : "S" (FUTEX_WAIT), "i" (SYS_futex), "D" (&tid), \
578 "d" (_tid) \
579 : "memory", "cc", "r10", "r11", "cx"); \
580 } while (0)
581
582 extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime)
583 attribute_hidden;
584 #define lll_timedwait_tid(tid, abstime) \
585 ({ \
586 int __result = 0; \
587 if (tid != 0) \
588 { \
589 if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) \
590 __result = EINVAL; \
591 else \
592 __result = __lll_timedwait_tid (&tid, abstime); \
593 } \
594 __result; })
595
596 #endif /* !__ASSEMBLER__ */
597
598 #endif /* lowlevellock.h */
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