This source file includes following definitions.
- rseq_cmpeqv_storev
- rseq_cmpnev_storeoffp_load
- rseq_addv
- rseq_cmpeqv_trystorev_storev
- rseq_cmpeqv_trystorev_storev_release
- rseq_cmpeqv_cmpeqv_storev
- rseq_cmpeqv_trymemcpy_storev
- rseq_cmpeqv_trymemcpy_storev_release
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26 #if defined(__nanomips__)
27 # ifdef __MIPSEL__
28 # define RSEQ_SIG 0x03500010
29 # else
30 # define RSEQ_SIG 0x00100350
31 # endif
32 #elif defined(__mips_micromips)
33 # ifdef __MIPSEL__
34 # define RSEQ_SIG 0xd4070000
35 # else
36 # define RSEQ_SIG 0x0000d407
37 # endif
38 #elif defined(__mips__)
39 # define RSEQ_SIG 0x0350000d
40 #else
41
42 #endif
43
44 #define rseq_smp_mb() __asm__ __volatile__ ("sync" ::: "memory")
45 #define rseq_smp_rmb() rseq_smp_mb()
46 #define rseq_smp_wmb() rseq_smp_mb()
47
48 #define rseq_smp_load_acquire(p) \
49 __extension__ ({ \
50 __typeof(*p) ____p1 = RSEQ_READ_ONCE(*p); \
51 rseq_smp_mb(); \
52 ____p1; \
53 })
54
55 #define rseq_smp_acquire__after_ctrl_dep() rseq_smp_rmb()
56
57 #define rseq_smp_store_release(p, v) \
58 do { \
59 rseq_smp_mb(); \
60 RSEQ_WRITE_ONCE(*p, v); \
61 } while (0)
62
63 #ifdef RSEQ_SKIP_FASTPATH
64 #include "rseq-skip.h"
65 #else
66
67 #if _MIPS_SZLONG == 64
68 # define LONG ".dword"
69 # define LONG_LA "dla"
70 # define LONG_L "ld"
71 # define LONG_S "sd"
72 # define LONG_ADDI "daddiu"
73 # define U32_U64_PAD(x) x
74 #elif _MIPS_SZLONG == 32
75 # define LONG ".word"
76 # define LONG_LA "la"
77 # define LONG_L "lw"
78 # define LONG_S "sw"
79 # define LONG_ADDI "addiu"
80 # ifdef __BIG_ENDIAN
81 # define U32_U64_PAD(x) "0x0, " x
82 # else
83 # define U32_U64_PAD(x) x ", 0x0"
84 # endif
85 #else
86 # error unsupported _MIPS_SZLONG
87 #endif
88
89 #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \
90 post_commit_offset, abort_ip) \
91 ".pushsection __rseq_cs, \"aw\"\n\t" \
92 ".balign 32\n\t" \
93 __rseq_str(label) ":\n\t" \
94 ".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
95 LONG " " U32_U64_PAD(__rseq_str(start_ip)) "\n\t" \
96 LONG " " U32_U64_PAD(__rseq_str(post_commit_offset)) "\n\t" \
97 LONG " " U32_U64_PAD(__rseq_str(abort_ip)) "\n\t" \
98 ".popsection\n\t" \
99 ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
100 LONG " " U32_U64_PAD(__rseq_str(label) "b") "\n\t" \
101 ".popsection\n\t"
102
103 #define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
104 __RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \
105 (post_commit_ip - start_ip), abort_ip)
106
107
108
109
110
111
112
113
114
115 #define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
116 ".pushsection __rseq_exit_point_array, \"aw\"\n\t" \
117 LONG " " U32_U64_PAD(__rseq_str(start_ip)) "\n\t" \
118 LONG " " U32_U64_PAD(__rseq_str(exit_ip)) "\n\t" \
119 ".popsection\n\t"
120
121 #define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
122 RSEQ_INJECT_ASM(1) \
123 LONG_LA " $4, " __rseq_str(cs_label) "\n\t" \
124 LONG_S " $4, %[" __rseq_str(rseq_cs) "]\n\t" \
125 __rseq_str(label) ":\n\t"
126
127 #define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \
128 RSEQ_INJECT_ASM(2) \
129 "lw $4, %[" __rseq_str(current_cpu_id) "]\n\t" \
130 "bne $4, %[" __rseq_str(cpu_id) "], " __rseq_str(label) "\n\t"
131
132 #define __RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, \
133 abort_label, version, flags, \
134 start_ip, post_commit_offset, abort_ip) \
135 ".balign 32\n\t" \
136 __rseq_str(table_label) ":\n\t" \
137 ".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
138 LONG " " U32_U64_PAD(__rseq_str(start_ip)) "\n\t" \
139 LONG " " U32_U64_PAD(__rseq_str(post_commit_offset)) "\n\t" \
140 LONG " " U32_U64_PAD(__rseq_str(abort_ip)) "\n\t" \
141 ".word " __rseq_str(RSEQ_SIG) "\n\t" \
142 __rseq_str(label) ":\n\t" \
143 teardown \
144 "b %l[" __rseq_str(abort_label) "]\n\t"
145
146 #define RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, abort_label, \
147 start_ip, post_commit_ip, abort_ip) \
148 __RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, \
149 abort_label, 0x0, 0x0, start_ip, \
150 (post_commit_ip - start_ip), abort_ip)
151
152 #define RSEQ_ASM_DEFINE_CMPFAIL(label, teardown, cmpfail_label) \
153 __rseq_str(label) ":\n\t" \
154 teardown \
155 "b %l[" __rseq_str(cmpfail_label) "]\n\t"
156
157 #define rseq_workaround_gcc_asm_size_guess() __asm__ __volatile__("")
158
159 static inline __attribute__((always_inline))
160 int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
161 {
162 RSEQ_INJECT_C(9)
163
164 rseq_workaround_gcc_asm_size_guess();
165 __asm__ __volatile__ goto (
166 RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f)
167 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
168 #ifdef RSEQ_COMPARE_TWICE
169 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
170 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
171 #endif
172
173 RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
174 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
175 RSEQ_INJECT_ASM(3)
176 LONG_L " $4, %[v]\n\t"
177 "bne $4, %[expect], %l[cmpfail]\n\t"
178 RSEQ_INJECT_ASM(4)
179 #ifdef RSEQ_COMPARE_TWICE
180 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
181 LONG_L " $4, %[v]\n\t"
182 "bne $4, %[expect], %l[error2]\n\t"
183 #endif
184
185 LONG_S " %[newv], %[v]\n\t"
186 "2:\n\t"
187 RSEQ_INJECT_ASM(5)
188 "b 5f\n\t"
189 RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
190 "5:\n\t"
191 :
192 : [cpu_id] "r" (cpu),
193 [current_cpu_id] "m" (__rseq_abi.cpu_id),
194 [rseq_cs] "m" (__rseq_abi.rseq_cs),
195 [v] "m" (*v),
196 [expect] "r" (expect),
197 [newv] "r" (newv)
198 RSEQ_INJECT_INPUT
199 : "$4", "memory"
200 RSEQ_INJECT_CLOBBER
201 : abort, cmpfail
202 #ifdef RSEQ_COMPARE_TWICE
203 , error1, error2
204 #endif
205 );
206 rseq_workaround_gcc_asm_size_guess();
207 return 0;
208 abort:
209 rseq_workaround_gcc_asm_size_guess();
210 RSEQ_INJECT_FAILED
211 return -1;
212 cmpfail:
213 rseq_workaround_gcc_asm_size_guess();
214 return 1;
215 #ifdef RSEQ_COMPARE_TWICE
216 error1:
217 rseq_bug("cpu_id comparison failed");
218 error2:
219 rseq_bug("expected value comparison failed");
220 #endif
221 }
222
223 static inline __attribute__((always_inline))
224 int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
225 off_t voffp, intptr_t *load, int cpu)
226 {
227 RSEQ_INJECT_C(9)
228
229 rseq_workaround_gcc_asm_size_guess();
230 __asm__ __volatile__ goto (
231 RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f)
232 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
233 #ifdef RSEQ_COMPARE_TWICE
234 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
235 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
236 #endif
237
238 RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
239 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
240 RSEQ_INJECT_ASM(3)
241 LONG_L " $4, %[v]\n\t"
242 "beq $4, %[expectnot], %l[cmpfail]\n\t"
243 RSEQ_INJECT_ASM(4)
244 #ifdef RSEQ_COMPARE_TWICE
245 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
246 LONG_L " $4, %[v]\n\t"
247 "beq $4, %[expectnot], %l[error2]\n\t"
248 #endif
249 LONG_S " $4, %[load]\n\t"
250 LONG_ADDI " $4, %[voffp]\n\t"
251 LONG_L " $4, 0($4)\n\t"
252
253 LONG_S " $4, %[v]\n\t"
254 "2:\n\t"
255 RSEQ_INJECT_ASM(5)
256 "b 5f\n\t"
257 RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
258 "5:\n\t"
259 :
260 : [cpu_id] "r" (cpu),
261 [current_cpu_id] "m" (__rseq_abi.cpu_id),
262 [rseq_cs] "m" (__rseq_abi.rseq_cs),
263
264 [v] "m" (*v),
265 [expectnot] "r" (expectnot),
266 [voffp] "Ir" (voffp),
267 [load] "m" (*load)
268 RSEQ_INJECT_INPUT
269 : "$4", "memory"
270 RSEQ_INJECT_CLOBBER
271 : abort, cmpfail
272 #ifdef RSEQ_COMPARE_TWICE
273 , error1, error2
274 #endif
275 );
276 rseq_workaround_gcc_asm_size_guess();
277 return 0;
278 abort:
279 rseq_workaround_gcc_asm_size_guess();
280 RSEQ_INJECT_FAILED
281 return -1;
282 cmpfail:
283 rseq_workaround_gcc_asm_size_guess();
284 return 1;
285 #ifdef RSEQ_COMPARE_TWICE
286 error1:
287 rseq_bug("cpu_id comparison failed");
288 error2:
289 rseq_bug("expected value comparison failed");
290 #endif
291 }
292
293 static inline __attribute__((always_inline))
294 int rseq_addv(intptr_t *v, intptr_t count, int cpu)
295 {
296 RSEQ_INJECT_C(9)
297
298 rseq_workaround_gcc_asm_size_guess();
299 __asm__ __volatile__ goto (
300 RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f)
301 #ifdef RSEQ_COMPARE_TWICE
302 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
303 #endif
304
305 RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
306 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
307 RSEQ_INJECT_ASM(3)
308 #ifdef RSEQ_COMPARE_TWICE
309 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
310 #endif
311 LONG_L " $4, %[v]\n\t"
312 LONG_ADDI " $4, %[count]\n\t"
313
314 LONG_S " $4, %[v]\n\t"
315 "2:\n\t"
316 RSEQ_INJECT_ASM(4)
317 "b 5f\n\t"
318 RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
319 "5:\n\t"
320 :
321 : [cpu_id] "r" (cpu),
322 [current_cpu_id] "m" (__rseq_abi.cpu_id),
323 [rseq_cs] "m" (__rseq_abi.rseq_cs),
324 [v] "m" (*v),
325 [count] "Ir" (count)
326 RSEQ_INJECT_INPUT
327 : "$4", "memory"
328 RSEQ_INJECT_CLOBBER
329 : abort
330 #ifdef RSEQ_COMPARE_TWICE
331 , error1
332 #endif
333 );
334 rseq_workaround_gcc_asm_size_guess();
335 return 0;
336 abort:
337 rseq_workaround_gcc_asm_size_guess();
338 RSEQ_INJECT_FAILED
339 return -1;
340 #ifdef RSEQ_COMPARE_TWICE
341 error1:
342 rseq_bug("cpu_id comparison failed");
343 #endif
344 }
345
346 static inline __attribute__((always_inline))
347 int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
348 intptr_t *v2, intptr_t newv2,
349 intptr_t newv, int cpu)
350 {
351 RSEQ_INJECT_C(9)
352
353 rseq_workaround_gcc_asm_size_guess();
354 __asm__ __volatile__ goto (
355 RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f)
356 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
357 #ifdef RSEQ_COMPARE_TWICE
358 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
359 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
360 #endif
361
362 RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
363 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
364 RSEQ_INJECT_ASM(3)
365 LONG_L " $4, %[v]\n\t"
366 "bne $4, %[expect], %l[cmpfail]\n\t"
367 RSEQ_INJECT_ASM(4)
368 #ifdef RSEQ_COMPARE_TWICE
369 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
370 LONG_L " $4, %[v]\n\t"
371 "bne $4, %[expect], %l[error2]\n\t"
372 #endif
373
374 LONG_S " %[newv2], %[v2]\n\t"
375 RSEQ_INJECT_ASM(5)
376
377 LONG_S " %[newv], %[v]\n\t"
378 "2:\n\t"
379 RSEQ_INJECT_ASM(6)
380 "b 5f\n\t"
381 RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
382 "5:\n\t"
383 :
384 : [cpu_id] "r" (cpu),
385 [current_cpu_id] "m" (__rseq_abi.cpu_id),
386 [rseq_cs] "m" (__rseq_abi.rseq_cs),
387
388 [v2] "m" (*v2),
389 [newv2] "r" (newv2),
390
391 [v] "m" (*v),
392 [expect] "r" (expect),
393 [newv] "r" (newv)
394 RSEQ_INJECT_INPUT
395 : "$4", "memory"
396 RSEQ_INJECT_CLOBBER
397 : abort, cmpfail
398 #ifdef RSEQ_COMPARE_TWICE
399 , error1, error2
400 #endif
401 );
402 rseq_workaround_gcc_asm_size_guess();
403 return 0;
404 abort:
405 rseq_workaround_gcc_asm_size_guess();
406 RSEQ_INJECT_FAILED
407 return -1;
408 cmpfail:
409 rseq_workaround_gcc_asm_size_guess();
410 return 1;
411 #ifdef RSEQ_COMPARE_TWICE
412 error1:
413 rseq_bug("cpu_id comparison failed");
414 error2:
415 rseq_bug("expected value comparison failed");
416 #endif
417 }
418
419 static inline __attribute__((always_inline))
420 int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
421 intptr_t *v2, intptr_t newv2,
422 intptr_t newv, int cpu)
423 {
424 RSEQ_INJECT_C(9)
425
426 rseq_workaround_gcc_asm_size_guess();
427 __asm__ __volatile__ goto (
428 RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f)
429 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
430 #ifdef RSEQ_COMPARE_TWICE
431 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
432 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
433 #endif
434
435 RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
436 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
437 RSEQ_INJECT_ASM(3)
438 LONG_L " $4, %[v]\n\t"
439 "bne $4, %[expect], %l[cmpfail]\n\t"
440 RSEQ_INJECT_ASM(4)
441 #ifdef RSEQ_COMPARE_TWICE
442 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
443 LONG_L " $4, %[v]\n\t"
444 "bne $4, %[expect], %l[error2]\n\t"
445 #endif
446
447 LONG_S " %[newv2], %[v2]\n\t"
448 RSEQ_INJECT_ASM(5)
449 "sync\n\t"
450
451 LONG_S " %[newv], %[v]\n\t"
452 "2:\n\t"
453 RSEQ_INJECT_ASM(6)
454 "b 5f\n\t"
455 RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
456 "5:\n\t"
457 :
458 : [cpu_id] "r" (cpu),
459 [current_cpu_id] "m" (__rseq_abi.cpu_id),
460 [rseq_cs] "m" (__rseq_abi.rseq_cs),
461
462 [v2] "m" (*v2),
463 [newv2] "r" (newv2),
464
465 [v] "m" (*v),
466 [expect] "r" (expect),
467 [newv] "r" (newv)
468 RSEQ_INJECT_INPUT
469 : "$4", "memory"
470 RSEQ_INJECT_CLOBBER
471 : abort, cmpfail
472 #ifdef RSEQ_COMPARE_TWICE
473 , error1, error2
474 #endif
475 );
476 rseq_workaround_gcc_asm_size_guess();
477 return 0;
478 abort:
479 rseq_workaround_gcc_asm_size_guess();
480 RSEQ_INJECT_FAILED
481 return -1;
482 cmpfail:
483 rseq_workaround_gcc_asm_size_guess();
484 return 1;
485 #ifdef RSEQ_COMPARE_TWICE
486 error1:
487 rseq_bug("cpu_id comparison failed");
488 error2:
489 rseq_bug("expected value comparison failed");
490 #endif
491 }
492
493 static inline __attribute__((always_inline))
494 int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
495 intptr_t *v2, intptr_t expect2,
496 intptr_t newv, int cpu)
497 {
498 RSEQ_INJECT_C(9)
499
500 rseq_workaround_gcc_asm_size_guess();
501 __asm__ __volatile__ goto (
502 RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f)
503 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
504 #ifdef RSEQ_COMPARE_TWICE
505 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
506 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
507 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error3])
508 #endif
509
510 RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
511 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
512 RSEQ_INJECT_ASM(3)
513 LONG_L " $4, %[v]\n\t"
514 "bne $4, %[expect], %l[cmpfail]\n\t"
515 RSEQ_INJECT_ASM(4)
516 LONG_L " $4, %[v2]\n\t"
517 "bne $4, %[expect2], %l[cmpfail]\n\t"
518 RSEQ_INJECT_ASM(5)
519 #ifdef RSEQ_COMPARE_TWICE
520 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
521 LONG_L " $4, %[v]\n\t"
522 "bne $4, %[expect], %l[error2]\n\t"
523 LONG_L " $4, %[v2]\n\t"
524 "bne $4, %[expect2], %l[error3]\n\t"
525 #endif
526
527 LONG_S " %[newv], %[v]\n\t"
528 "2:\n\t"
529 RSEQ_INJECT_ASM(6)
530 "b 5f\n\t"
531 RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
532 "5:\n\t"
533 :
534 : [cpu_id] "r" (cpu),
535 [current_cpu_id] "m" (__rseq_abi.cpu_id),
536 [rseq_cs] "m" (__rseq_abi.rseq_cs),
537
538 [v2] "m" (*v2),
539 [expect2] "r" (expect2),
540
541 [v] "m" (*v),
542 [expect] "r" (expect),
543 [newv] "r" (newv)
544 RSEQ_INJECT_INPUT
545 : "$4", "memory"
546 RSEQ_INJECT_CLOBBER
547 : abort, cmpfail
548 #ifdef RSEQ_COMPARE_TWICE
549 , error1, error2, error3
550 #endif
551 );
552 rseq_workaround_gcc_asm_size_guess();
553 return 0;
554 abort:
555 rseq_workaround_gcc_asm_size_guess();
556 RSEQ_INJECT_FAILED
557 return -1;
558 cmpfail:
559 rseq_workaround_gcc_asm_size_guess();
560 return 1;
561 #ifdef RSEQ_COMPARE_TWICE
562 error1:
563 rseq_bug("cpu_id comparison failed");
564 error2:
565 rseq_bug("1st expected value comparison failed");
566 error3:
567 rseq_bug("2nd expected value comparison failed");
568 #endif
569 }
570
571 static inline __attribute__((always_inline))
572 int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
573 void *dst, void *src, size_t len,
574 intptr_t newv, int cpu)
575 {
576 uintptr_t rseq_scratch[3];
577
578 RSEQ_INJECT_C(9)
579
580 rseq_workaround_gcc_asm_size_guess();
581 __asm__ __volatile__ goto (
582 RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f)
583 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
584 #ifdef RSEQ_COMPARE_TWICE
585 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
586 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
587 #endif
588 LONG_S " %[src], %[rseq_scratch0]\n\t"
589 LONG_S " %[dst], %[rseq_scratch1]\n\t"
590 LONG_S " %[len], %[rseq_scratch2]\n\t"
591
592 RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
593 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
594 RSEQ_INJECT_ASM(3)
595 LONG_L " $4, %[v]\n\t"
596 "bne $4, %[expect], 5f\n\t"
597 RSEQ_INJECT_ASM(4)
598 #ifdef RSEQ_COMPARE_TWICE
599 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
600 LONG_L " $4, %[v]\n\t"
601 "bne $4, %[expect], 7f\n\t"
602 #endif
603
604 "beqz %[len], 333f\n\t" \
605 "222:\n\t" \
606 "lb $4, 0(%[src])\n\t" \
607 "sb $4, 0(%[dst])\n\t" \
608 LONG_ADDI " %[src], 1\n\t" \
609 LONG_ADDI " %[dst], 1\n\t" \
610 LONG_ADDI " %[len], -1\n\t" \
611 "bnez %[len], 222b\n\t" \
612 "333:\n\t" \
613 RSEQ_INJECT_ASM(5)
614
615 LONG_S " %[newv], %[v]\n\t"
616 "2:\n\t"
617 RSEQ_INJECT_ASM(6)
618
619 LONG_L " %[len], %[rseq_scratch2]\n\t"
620 LONG_L " %[dst], %[rseq_scratch1]\n\t"
621 LONG_L " %[src], %[rseq_scratch0]\n\t"
622 "b 8f\n\t"
623 RSEQ_ASM_DEFINE_ABORT(3, 4,
624
625 LONG_L " %[len], %[rseq_scratch2]\n\t"
626 LONG_L " %[dst], %[rseq_scratch1]\n\t"
627 LONG_L " %[src], %[rseq_scratch0]\n\t",
628 abort, 1b, 2b, 4f)
629 RSEQ_ASM_DEFINE_CMPFAIL(5,
630
631 LONG_L " %[len], %[rseq_scratch2]\n\t"
632 LONG_L " %[dst], %[rseq_scratch1]\n\t"
633 LONG_L " %[src], %[rseq_scratch0]\n\t",
634 cmpfail)
635 #ifdef RSEQ_COMPARE_TWICE
636 RSEQ_ASM_DEFINE_CMPFAIL(6,
637
638 LONG_L " %[len], %[rseq_scratch2]\n\t"
639 LONG_L " %[dst], %[rseq_scratch1]\n\t"
640 LONG_L " %[src], %[rseq_scratch0]\n\t",
641 error1)
642 RSEQ_ASM_DEFINE_CMPFAIL(7,
643
644 LONG_L " %[len], %[rseq_scratch2]\n\t"
645 LONG_L " %[dst], %[rseq_scratch1]\n\t"
646 LONG_L " %[src], %[rseq_scratch0]\n\t",
647 error2)
648 #endif
649 "8:\n\t"
650 :
651 : [cpu_id] "r" (cpu),
652 [current_cpu_id] "m" (__rseq_abi.cpu_id),
653 [rseq_cs] "m" (__rseq_abi.rseq_cs),
654
655 [v] "m" (*v),
656 [expect] "r" (expect),
657 [newv] "r" (newv),
658
659 [dst] "r" (dst),
660 [src] "r" (src),
661 [len] "r" (len),
662 [rseq_scratch0] "m" (rseq_scratch[0]),
663 [rseq_scratch1] "m" (rseq_scratch[1]),
664 [rseq_scratch2] "m" (rseq_scratch[2])
665 RSEQ_INJECT_INPUT
666 : "$4", "memory"
667 RSEQ_INJECT_CLOBBER
668 : abort, cmpfail
669 #ifdef RSEQ_COMPARE_TWICE
670 , error1, error2
671 #endif
672 );
673 rseq_workaround_gcc_asm_size_guess();
674 return 0;
675 abort:
676 rseq_workaround_gcc_asm_size_guess();
677 RSEQ_INJECT_FAILED
678 return -1;
679 cmpfail:
680 rseq_workaround_gcc_asm_size_guess();
681 return 1;
682 #ifdef RSEQ_COMPARE_TWICE
683 error1:
684 rseq_workaround_gcc_asm_size_guess();
685 rseq_bug("cpu_id comparison failed");
686 error2:
687 rseq_workaround_gcc_asm_size_guess();
688 rseq_bug("expected value comparison failed");
689 #endif
690 }
691
692 static inline __attribute__((always_inline))
693 int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
694 void *dst, void *src, size_t len,
695 intptr_t newv, int cpu)
696 {
697 uintptr_t rseq_scratch[3];
698
699 RSEQ_INJECT_C(9)
700
701 rseq_workaround_gcc_asm_size_guess();
702 __asm__ __volatile__ goto (
703 RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f)
704 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
705 #ifdef RSEQ_COMPARE_TWICE
706 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
707 RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
708 #endif
709 LONG_S " %[src], %[rseq_scratch0]\n\t"
710 LONG_S " %[dst], %[rseq_scratch1]\n\t"
711 LONG_S " %[len], %[rseq_scratch2]\n\t"
712
713 RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
714 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
715 RSEQ_INJECT_ASM(3)
716 LONG_L " $4, %[v]\n\t"
717 "bne $4, %[expect], 5f\n\t"
718 RSEQ_INJECT_ASM(4)
719 #ifdef RSEQ_COMPARE_TWICE
720 RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
721 LONG_L " $4, %[v]\n\t"
722 "bne $4, %[expect], 7f\n\t"
723 #endif
724
725 "beqz %[len], 333f\n\t" \
726 "222:\n\t" \
727 "lb $4, 0(%[src])\n\t" \
728 "sb $4, 0(%[dst])\n\t" \
729 LONG_ADDI " %[src], 1\n\t" \
730 LONG_ADDI " %[dst], 1\n\t" \
731 LONG_ADDI " %[len], -1\n\t" \
732 "bnez %[len], 222b\n\t" \
733 "333:\n\t" \
734 RSEQ_INJECT_ASM(5)
735 "sync\n\t"
736
737 LONG_S " %[newv], %[v]\n\t"
738 "2:\n\t"
739 RSEQ_INJECT_ASM(6)
740
741 LONG_L " %[len], %[rseq_scratch2]\n\t"
742 LONG_L " %[dst], %[rseq_scratch1]\n\t"
743 LONG_L " %[src], %[rseq_scratch0]\n\t"
744 "b 8f\n\t"
745 RSEQ_ASM_DEFINE_ABORT(3, 4,
746
747 LONG_L " %[len], %[rseq_scratch2]\n\t"
748 LONG_L " %[dst], %[rseq_scratch1]\n\t"
749 LONG_L " %[src], %[rseq_scratch0]\n\t",
750 abort, 1b, 2b, 4f)
751 RSEQ_ASM_DEFINE_CMPFAIL(5,
752
753 LONG_L " %[len], %[rseq_scratch2]\n\t"
754 LONG_L " %[dst], %[rseq_scratch1]\n\t"
755 LONG_L " %[src], %[rseq_scratch0]\n\t",
756 cmpfail)
757 #ifdef RSEQ_COMPARE_TWICE
758 RSEQ_ASM_DEFINE_CMPFAIL(6,
759
760 LONG_L " %[len], %[rseq_scratch2]\n\t"
761 LONG_L " %[dst], %[rseq_scratch1]\n\t"
762 LONG_L " %[src], %[rseq_scratch0]\n\t",
763 error1)
764 RSEQ_ASM_DEFINE_CMPFAIL(7,
765
766 LONG_L " %[len], %[rseq_scratch2]\n\t"
767 LONG_L " %[dst], %[rseq_scratch1]\n\t"
768 LONG_L " %[src], %[rseq_scratch0]\n\t",
769 error2)
770 #endif
771 "8:\n\t"
772 :
773 : [cpu_id] "r" (cpu),
774 [current_cpu_id] "m" (__rseq_abi.cpu_id),
775 [rseq_cs] "m" (__rseq_abi.rseq_cs),
776
777 [v] "m" (*v),
778 [expect] "r" (expect),
779 [newv] "r" (newv),
780
781 [dst] "r" (dst),
782 [src] "r" (src),
783 [len] "r" (len),
784 [rseq_scratch0] "m" (rseq_scratch[0]),
785 [rseq_scratch1] "m" (rseq_scratch[1]),
786 [rseq_scratch2] "m" (rseq_scratch[2])
787 RSEQ_INJECT_INPUT
788 : "$4", "memory"
789 RSEQ_INJECT_CLOBBER
790 : abort, cmpfail
791 #ifdef RSEQ_COMPARE_TWICE
792 , error1, error2
793 #endif
794 );
795 rseq_workaround_gcc_asm_size_guess();
796 return 0;
797 abort:
798 rseq_workaround_gcc_asm_size_guess();
799 RSEQ_INJECT_FAILED
800 return -1;
801 cmpfail:
802 rseq_workaround_gcc_asm_size_guess();
803 return 1;
804 #ifdef RSEQ_COMPARE_TWICE
805 error1:
806 rseq_workaround_gcc_asm_size_guess();
807 rseq_bug("cpu_id comparison failed");
808 error2:
809 rseq_workaround_gcc_asm_size_guess();
810 rseq_bug("expected value comparison failed");
811 #endif
812 }
813
814 #endif