github.com/comwrg/go/src@v0.0.0-20220319063731-c238d0440370/runtime/sys_linux_arm64.s (about) 1 // Copyright 2014 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // 6 // System calls and other sys.stuff for arm64, Linux 7 // 8 9 #include "go_asm.h" 10 #include "go_tls.h" 11 #include "textflag.h" 12 13 #define AT_FDCWD -100 14 15 #define CLOCK_REALTIME 0 16 #define CLOCK_MONOTONIC 1 17 18 #define SYS_exit 93 19 #define SYS_read 63 20 #define SYS_write 64 21 #define SYS_openat 56 22 #define SYS_close 57 23 #define SYS_pipe2 59 24 #define SYS_fcntl 25 25 #define SYS_nanosleep 101 26 #define SYS_mmap 222 27 #define SYS_munmap 215 28 #define SYS_setitimer 103 29 #define SYS_clone 220 30 #define SYS_sched_yield 124 31 #define SYS_rt_sigreturn 139 32 #define SYS_rt_sigaction 134 33 #define SYS_rt_sigprocmask 135 34 #define SYS_sigaltstack 132 35 #define SYS_madvise 233 36 #define SYS_mincore 232 37 #define SYS_getpid 172 38 #define SYS_gettid 178 39 #define SYS_kill 129 40 #define SYS_tgkill 131 41 #define SYS_futex 98 42 #define SYS_sched_getaffinity 123 43 #define SYS_exit_group 94 44 #define SYS_epoll_create1 20 45 #define SYS_epoll_ctl 21 46 #define SYS_epoll_pwait 22 47 #define SYS_clock_gettime 113 48 #define SYS_faccessat 48 49 #define SYS_socket 198 50 #define SYS_connect 203 51 #define SYS_brk 214 52 53 TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4 54 MOVW code+0(FP), R0 55 MOVD $SYS_exit_group, R8 56 SVC 57 RET 58 59 // func exitThread(wait *uint32) 60 TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8 61 MOVD wait+0(FP), R0 62 // We're done using the stack. 63 MOVW $0, R1 64 STLRW R1, (R0) 65 MOVW $0, R0 // exit code 66 MOVD $SYS_exit, R8 67 SVC 68 JMP 0(PC) 69 70 TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20 71 MOVD $AT_FDCWD, R0 72 MOVD name+0(FP), R1 73 MOVW mode+8(FP), R2 74 MOVW perm+12(FP), R3 75 MOVD $SYS_openat, R8 76 SVC 77 CMN $4095, R0 78 BCC done 79 MOVW $-1, R0 80 done: 81 MOVW R0, ret+16(FP) 82 RET 83 84 TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12 85 MOVW fd+0(FP), R0 86 MOVD $SYS_close, R8 87 SVC 88 CMN $4095, R0 89 BCC done 90 MOVW $-1, R0 91 done: 92 MOVW R0, ret+8(FP) 93 RET 94 95 TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28 96 MOVD fd+0(FP), R0 97 MOVD p+8(FP), R1 98 MOVW n+16(FP), R2 99 MOVD $SYS_write, R8 100 SVC 101 MOVW R0, ret+24(FP) 102 RET 103 104 TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28 105 MOVW fd+0(FP), R0 106 MOVD p+8(FP), R1 107 MOVW n+16(FP), R2 108 MOVD $SYS_read, R8 109 SVC 110 MOVW R0, ret+24(FP) 111 RET 112 113 // func pipe() (r, w int32, errno int32) 114 TEXT runtime·pipe(SB),NOSPLIT|NOFRAME,$0-12 115 MOVD $r+0(FP), R0 116 MOVW $0, R1 117 MOVW $SYS_pipe2, R8 118 SVC 119 MOVW R0, errno+8(FP) 120 RET 121 122 // func pipe2(flags int32) (r, w int32, errno int32) 123 TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20 124 MOVD $r+8(FP), R0 125 MOVW flags+0(FP), R1 126 MOVW $SYS_pipe2, R8 127 SVC 128 MOVW R0, errno+16(FP) 129 RET 130 131 TEXT runtime·usleep(SB),NOSPLIT,$24-4 132 MOVWU usec+0(FP), R3 133 MOVD R3, R5 134 MOVW $1000000, R4 135 UDIV R4, R3 136 MOVD R3, 8(RSP) 137 MUL R3, R4 138 SUB R4, R5 139 MOVW $1000, R4 140 MUL R4, R5 141 MOVD R5, 16(RSP) 142 143 // nanosleep(&ts, 0) 144 ADD $8, RSP, R0 145 MOVD $0, R1 146 MOVD $SYS_nanosleep, R8 147 SVC 148 RET 149 150 TEXT runtime·gettid(SB),NOSPLIT,$0-4 151 MOVD $SYS_gettid, R8 152 SVC 153 MOVW R0, ret+0(FP) 154 RET 155 156 TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0 157 MOVD $SYS_getpid, R8 158 SVC 159 MOVW R0, R19 160 MOVD $SYS_gettid, R8 161 SVC 162 MOVW R0, R1 // arg 2 tid 163 MOVW R19, R0 // arg 1 pid 164 MOVW sig+0(FP), R2 // arg 3 165 MOVD $SYS_tgkill, R8 166 SVC 167 RET 168 169 TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0 170 MOVD $SYS_getpid, R8 171 SVC 172 MOVW R0, R0 // arg 1 pid 173 MOVW sig+0(FP), R1 // arg 2 174 MOVD $SYS_kill, R8 175 SVC 176 RET 177 178 TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8 179 MOVD $SYS_getpid, R8 180 SVC 181 MOVD R0, ret+0(FP) 182 RET 183 184 TEXT ·tgkill(SB),NOSPLIT,$0-24 185 MOVD tgid+0(FP), R0 186 MOVD tid+8(FP), R1 187 MOVD sig+16(FP), R2 188 MOVD $SYS_tgkill, R8 189 SVC 190 RET 191 192 TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24 193 MOVW mode+0(FP), R0 194 MOVD new+8(FP), R1 195 MOVD old+16(FP), R2 196 MOVD $SYS_setitimer, R8 197 SVC 198 RET 199 200 TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28 201 MOVD addr+0(FP), R0 202 MOVD n+8(FP), R1 203 MOVD dst+16(FP), R2 204 MOVD $SYS_mincore, R8 205 SVC 206 MOVW R0, ret+24(FP) 207 RET 208 209 // func walltime() (sec int64, nsec int32) 210 TEXT runtime·walltime(SB),NOSPLIT,$24-12 211 MOVD RSP, R20 // R20 is unchanged by C code 212 MOVD RSP, R1 213 214 MOVD g_m(g), R21 // R21 = m 215 216 // Set vdsoPC and vdsoSP for SIGPROF traceback. 217 // Save the old values on stack and restore them on exit, 218 // so this function is reentrant. 219 MOVD m_vdsoPC(R21), R2 220 MOVD m_vdsoSP(R21), R3 221 MOVD R2, 8(RSP) 222 MOVD R3, 16(RSP) 223 224 MOVD $ret-8(FP), R2 // caller's SP 225 MOVD LR, m_vdsoPC(R21) 226 MOVD R2, m_vdsoSP(R21) 227 228 MOVD m_curg(R21), R0 229 CMP g, R0 230 BNE noswitch 231 232 MOVD m_g0(R21), R3 233 MOVD (g_sched+gobuf_sp)(R3), R1 // Set RSP to g0 stack 234 235 noswitch: 236 SUB $16, R1 237 BIC $15, R1 // Align for C code 238 MOVD R1, RSP 239 240 MOVW $CLOCK_REALTIME, R0 241 MOVD runtime·vdsoClockgettimeSym(SB), R2 242 CBZ R2, fallback 243 244 // Store g on gsignal's stack, so if we receive a signal 245 // during VDSO code we can find the g. 246 // If we don't have a signal stack, we won't receive signal, 247 // so don't bother saving g. 248 // When using cgo, we already saved g on TLS, also don't save 249 // g here. 250 // Also don't save g if we are already on the signal stack. 251 // We won't get a nested signal. 252 MOVBU runtime·iscgo(SB), R22 253 CBNZ R22, nosaveg 254 MOVD m_gsignal(R21), R22 // g.m.gsignal 255 CBZ R22, nosaveg 256 CMP g, R22 257 BEQ nosaveg 258 MOVD (g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo 259 MOVD g, (R22) 260 261 BL (R2) 262 263 MOVD ZR, (R22) // clear g slot, R22 is unchanged by C code 264 265 B finish 266 267 nosaveg: 268 BL (R2) 269 B finish 270 271 fallback: 272 MOVD $SYS_clock_gettime, R8 273 SVC 274 275 finish: 276 MOVD 0(RSP), R3 // sec 277 MOVD 8(RSP), R5 // nsec 278 279 MOVD R20, RSP // restore SP 280 // Restore vdsoPC, vdsoSP 281 // We don't worry about being signaled between the two stores. 282 // If we are not in a signal handler, we'll restore vdsoSP to 0, 283 // and no one will care about vdsoPC. If we are in a signal handler, 284 // we cannot receive another signal. 285 MOVD 16(RSP), R1 286 MOVD R1, m_vdsoSP(R21) 287 MOVD 8(RSP), R1 288 MOVD R1, m_vdsoPC(R21) 289 290 MOVD R3, sec+0(FP) 291 MOVW R5, nsec+8(FP) 292 RET 293 294 TEXT runtime·nanotime1(SB),NOSPLIT,$24-8 295 MOVD RSP, R20 // R20 is unchanged by C code 296 MOVD RSP, R1 297 298 MOVD g_m(g), R21 // R21 = m 299 300 // Set vdsoPC and vdsoSP for SIGPROF traceback. 301 // Save the old values on stack and restore them on exit, 302 // so this function is reentrant. 303 MOVD m_vdsoPC(R21), R2 304 MOVD m_vdsoSP(R21), R3 305 MOVD R2, 8(RSP) 306 MOVD R3, 16(RSP) 307 308 MOVD $ret-8(FP), R2 // caller's SP 309 MOVD LR, m_vdsoPC(R21) 310 MOVD R2, m_vdsoSP(R21) 311 312 MOVD m_curg(R21), R0 313 CMP g, R0 314 BNE noswitch 315 316 MOVD m_g0(R21), R3 317 MOVD (g_sched+gobuf_sp)(R3), R1 // Set RSP to g0 stack 318 319 noswitch: 320 SUB $32, R1 321 BIC $15, R1 322 MOVD R1, RSP 323 324 MOVW $CLOCK_MONOTONIC, R0 325 MOVD runtime·vdsoClockgettimeSym(SB), R2 326 CBZ R2, fallback 327 328 // Store g on gsignal's stack, so if we receive a signal 329 // during VDSO code we can find the g. 330 // If we don't have a signal stack, we won't receive signal, 331 // so don't bother saving g. 332 // When using cgo, we already saved g on TLS, also don't save 333 // g here. 334 // Also don't save g if we are already on the signal stack. 335 // We won't get a nested signal. 336 MOVBU runtime·iscgo(SB), R22 337 CBNZ R22, nosaveg 338 MOVD m_gsignal(R21), R22 // g.m.gsignal 339 CBZ R22, nosaveg 340 CMP g, R22 341 BEQ nosaveg 342 MOVD (g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo 343 MOVD g, (R22) 344 345 BL (R2) 346 347 MOVD ZR, (R22) // clear g slot, R22 is unchanged by C code 348 349 B finish 350 351 nosaveg: 352 BL (R2) 353 B finish 354 355 fallback: 356 MOVD $SYS_clock_gettime, R8 357 SVC 358 359 finish: 360 MOVD 0(RSP), R3 // sec 361 MOVD 8(RSP), R5 // nsec 362 363 MOVD R20, RSP // restore SP 364 // Restore vdsoPC, vdsoSP 365 // We don't worry about being signaled between the two stores. 366 // If we are not in a signal handler, we'll restore vdsoSP to 0, 367 // and no one will care about vdsoPC. If we are in a signal handler, 368 // we cannot receive another signal. 369 MOVD 16(RSP), R1 370 MOVD R1, m_vdsoSP(R21) 371 MOVD 8(RSP), R1 372 MOVD R1, m_vdsoPC(R21) 373 374 // sec is in R3, nsec in R5 375 // return nsec in R3 376 MOVD $1000000000, R4 377 MUL R4, R3 378 ADD R5, R3 379 MOVD R3, ret+0(FP) 380 RET 381 382 TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28 383 MOVW how+0(FP), R0 384 MOVD new+8(FP), R1 385 MOVD old+16(FP), R2 386 MOVW size+24(FP), R3 387 MOVD $SYS_rt_sigprocmask, R8 388 SVC 389 CMN $4095, R0 390 BCC done 391 MOVD $0, R0 392 MOVD R0, (R0) // crash 393 done: 394 RET 395 396 TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36 397 MOVD sig+0(FP), R0 398 MOVD new+8(FP), R1 399 MOVD old+16(FP), R2 400 MOVD size+24(FP), R3 401 MOVD $SYS_rt_sigaction, R8 402 SVC 403 MOVW R0, ret+32(FP) 404 RET 405 406 // Call the function stored in _cgo_sigaction using the GCC calling convention. 407 TEXT runtime·callCgoSigaction(SB),NOSPLIT,$0 408 MOVD sig+0(FP), R0 409 MOVD new+8(FP), R1 410 MOVD old+16(FP), R2 411 MOVD _cgo_sigaction(SB), R3 412 SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. 413 BL R3 414 ADD $16, RSP 415 MOVW R0, ret+24(FP) 416 RET 417 418 TEXT runtime·sigfwd(SB),NOSPLIT,$0-32 419 MOVW sig+8(FP), R0 420 MOVD info+16(FP), R1 421 MOVD ctx+24(FP), R2 422 MOVD fn+0(FP), R11 423 BL (R11) 424 RET 425 426 TEXT runtime·sigtramp(SB),NOSPLIT,$192 427 // Save callee-save registers in the case of signal forwarding. 428 // Please refer to https://golang.org/issue/31827 . 429 MOVD R19, 8*4(RSP) 430 MOVD R20, 8*5(RSP) 431 MOVD R21, 8*6(RSP) 432 MOVD R22, 8*7(RSP) 433 MOVD R23, 8*8(RSP) 434 MOVD R24, 8*9(RSP) 435 MOVD R25, 8*10(RSP) 436 MOVD R26, 8*11(RSP) 437 MOVD R27, 8*12(RSP) 438 MOVD g, 8*13(RSP) 439 MOVD R29, 8*14(RSP) 440 FMOVD F8, 8*15(RSP) 441 FMOVD F9, 8*16(RSP) 442 FMOVD F10, 8*17(RSP) 443 FMOVD F11, 8*18(RSP) 444 FMOVD F12, 8*19(RSP) 445 FMOVD F13, 8*20(RSP) 446 FMOVD F14, 8*21(RSP) 447 FMOVD F15, 8*22(RSP) 448 449 // this might be called in external code context, 450 // where g is not set. 451 // first save R0, because runtime·load_g will clobber it 452 MOVW R0, 8(RSP) 453 MOVBU runtime·iscgo(SB), R0 454 CBZ R0, 2(PC) 455 BL runtime·load_g(SB) 456 457 MOVD R1, 16(RSP) 458 MOVD R2, 24(RSP) 459 MOVD $runtime·sigtrampgo(SB), R0 460 BL (R0) 461 462 // Restore callee-save registers. 463 MOVD 8*4(RSP), R19 464 MOVD 8*5(RSP), R20 465 MOVD 8*6(RSP), R21 466 MOVD 8*7(RSP), R22 467 MOVD 8*8(RSP), R23 468 MOVD 8*9(RSP), R24 469 MOVD 8*10(RSP), R25 470 MOVD 8*11(RSP), R26 471 MOVD 8*12(RSP), R27 472 MOVD 8*13(RSP), g 473 MOVD 8*14(RSP), R29 474 FMOVD 8*15(RSP), F8 475 FMOVD 8*16(RSP), F9 476 FMOVD 8*17(RSP), F10 477 FMOVD 8*18(RSP), F11 478 FMOVD 8*19(RSP), F12 479 FMOVD 8*20(RSP), F13 480 FMOVD 8*21(RSP), F14 481 FMOVD 8*22(RSP), F15 482 483 RET 484 485 TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0 486 MOVD $runtime·sigtramp(SB), R3 487 B (R3) 488 489 TEXT runtime·sysMmap(SB),NOSPLIT|NOFRAME,$0 490 MOVD addr+0(FP), R0 491 MOVD n+8(FP), R1 492 MOVW prot+16(FP), R2 493 MOVW flags+20(FP), R3 494 MOVW fd+24(FP), R4 495 MOVW off+28(FP), R5 496 497 MOVD $SYS_mmap, R8 498 SVC 499 CMN $4095, R0 500 BCC ok 501 NEG R0,R0 502 MOVD $0, p+32(FP) 503 MOVD R0, err+40(FP) 504 RET 505 ok: 506 MOVD R0, p+32(FP) 507 MOVD $0, err+40(FP) 508 RET 509 510 // Call the function stored in _cgo_mmap using the GCC calling convention. 511 // This must be called on the system stack. 512 TEXT runtime·callCgoMmap(SB),NOSPLIT,$0 513 MOVD addr+0(FP), R0 514 MOVD n+8(FP), R1 515 MOVW prot+16(FP), R2 516 MOVW flags+20(FP), R3 517 MOVW fd+24(FP), R4 518 MOVW off+28(FP), R5 519 MOVD _cgo_mmap(SB), R9 520 SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. 521 BL R9 522 ADD $16, RSP 523 MOVD R0, ret+32(FP) 524 RET 525 526 TEXT runtime·sysMunmap(SB),NOSPLIT|NOFRAME,$0 527 MOVD addr+0(FP), R0 528 MOVD n+8(FP), R1 529 MOVD $SYS_munmap, R8 530 SVC 531 CMN $4095, R0 532 BCC cool 533 MOVD R0, 0xf0(R0) 534 cool: 535 RET 536 537 // Call the function stored in _cgo_munmap using the GCC calling convention. 538 // This must be called on the system stack. 539 TEXT runtime·callCgoMunmap(SB),NOSPLIT,$0 540 MOVD addr+0(FP), R0 541 MOVD n+8(FP), R1 542 MOVD _cgo_munmap(SB), R9 543 SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. 544 BL R9 545 ADD $16, RSP 546 RET 547 548 TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0 549 MOVD addr+0(FP), R0 550 MOVD n+8(FP), R1 551 MOVW flags+16(FP), R2 552 MOVD $SYS_madvise, R8 553 SVC 554 MOVW R0, ret+24(FP) 555 RET 556 557 // int64 futex(int32 *uaddr, int32 op, int32 val, 558 // struct timespec *timeout, int32 *uaddr2, int32 val2); 559 TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0 560 MOVD addr+0(FP), R0 561 MOVW op+8(FP), R1 562 MOVW val+12(FP), R2 563 MOVD ts+16(FP), R3 564 MOVD addr2+24(FP), R4 565 MOVW val3+32(FP), R5 566 MOVD $SYS_futex, R8 567 SVC 568 MOVW R0, ret+40(FP) 569 RET 570 571 // int64 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void)); 572 TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0 573 MOVW flags+0(FP), R0 574 MOVD stk+8(FP), R1 575 576 // Copy mp, gp, fn off parent stack for use by child. 577 MOVD mp+16(FP), R10 578 MOVD gp+24(FP), R11 579 MOVD fn+32(FP), R12 580 581 MOVD R10, -8(R1) 582 MOVD R11, -16(R1) 583 MOVD R12, -24(R1) 584 MOVD $1234, R10 585 MOVD R10, -32(R1) 586 587 MOVD $SYS_clone, R8 588 SVC 589 590 // In parent, return. 591 CMP ZR, R0 592 BEQ child 593 MOVW R0, ret+40(FP) 594 RET 595 child: 596 597 // In child, on new stack. 598 MOVD -32(RSP), R10 599 MOVD $1234, R0 600 CMP R0, R10 601 BEQ good 602 MOVD $0, R0 603 MOVD R0, (R0) // crash 604 605 good: 606 // Initialize m->procid to Linux tid 607 MOVD $SYS_gettid, R8 608 SVC 609 610 MOVD -24(RSP), R12 // fn 611 MOVD -16(RSP), R11 // g 612 MOVD -8(RSP), R10 // m 613 614 CMP $0, R10 615 BEQ nog 616 CMP $0, R11 617 BEQ nog 618 619 MOVD R0, m_procid(R10) 620 621 // TODO: setup TLS. 622 623 // In child, set up new stack 624 MOVD R10, g_m(R11) 625 MOVD R11, g 626 //CALL runtime·stackcheck(SB) 627 628 nog: 629 // Call fn 630 MOVD R12, R0 631 BL (R0) 632 633 // It shouldn't return. If it does, exit that thread. 634 MOVW $111, R0 635 again: 636 MOVD $SYS_exit, R8 637 SVC 638 B again // keep exiting 639 640 TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0 641 MOVD new+0(FP), R0 642 MOVD old+8(FP), R1 643 MOVD $SYS_sigaltstack, R8 644 SVC 645 CMN $4095, R0 646 BCC ok 647 MOVD $0, R0 648 MOVD R0, (R0) // crash 649 ok: 650 RET 651 652 TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0 653 MOVD $SYS_sched_yield, R8 654 SVC 655 RET 656 657 TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0 658 MOVD pid+0(FP), R0 659 MOVD len+8(FP), R1 660 MOVD buf+16(FP), R2 661 MOVD $SYS_sched_getaffinity, R8 662 SVC 663 MOVW R0, ret+24(FP) 664 RET 665 666 // int32 runtime·epollcreate(int32 size); 667 TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0 668 MOVW $0, R0 669 MOVD $SYS_epoll_create1, R8 670 SVC 671 MOVW R0, ret+8(FP) 672 RET 673 674 // int32 runtime·epollcreate1(int32 flags); 675 TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0 676 MOVW flags+0(FP), R0 677 MOVD $SYS_epoll_create1, R8 678 SVC 679 MOVW R0, ret+8(FP) 680 RET 681 682 // func epollctl(epfd, op, fd int32, ev *epollEvent) int 683 TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0 684 MOVW epfd+0(FP), R0 685 MOVW op+4(FP), R1 686 MOVW fd+8(FP), R2 687 MOVD ev+16(FP), R3 688 MOVD $SYS_epoll_ctl, R8 689 SVC 690 MOVW R0, ret+24(FP) 691 RET 692 693 // int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout); 694 TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0 695 MOVW epfd+0(FP), R0 696 MOVD ev+8(FP), R1 697 MOVW nev+16(FP), R2 698 MOVW timeout+20(FP), R3 699 MOVD $0, R4 700 MOVD $SYS_epoll_pwait, R8 701 SVC 702 MOVW R0, ret+24(FP) 703 RET 704 705 // void runtime·closeonexec(int32 fd); 706 TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0 707 MOVW fd+0(FP), R0 // fd 708 MOVD $2, R1 // F_SETFD 709 MOVD $1, R2 // FD_CLOEXEC 710 MOVD $SYS_fcntl, R8 711 SVC 712 RET 713 714 // func runtime·setNonblock(int32 fd) 715 TEXT runtime·setNonblock(SB),NOSPLIT|NOFRAME,$0-4 716 MOVW fd+0(FP), R0 // fd 717 MOVD $3, R1 // F_GETFL 718 MOVD $0, R2 719 MOVD $SYS_fcntl, R8 720 SVC 721 MOVD $0x800, R2 // O_NONBLOCK 722 ORR R0, R2 723 MOVW fd+0(FP), R0 // fd 724 MOVD $4, R1 // F_SETFL 725 MOVD $SYS_fcntl, R8 726 SVC 727 RET 728 729 // int access(const char *name, int mode) 730 TEXT runtime·access(SB),NOSPLIT,$0-20 731 MOVD $AT_FDCWD, R0 732 MOVD name+0(FP), R1 733 MOVW mode+8(FP), R2 734 MOVD $SYS_faccessat, R8 735 SVC 736 MOVW R0, ret+16(FP) 737 RET 738 739 // int connect(int fd, const struct sockaddr *addr, socklen_t len) 740 TEXT runtime·connect(SB),NOSPLIT,$0-28 741 MOVW fd+0(FP), R0 742 MOVD addr+8(FP), R1 743 MOVW len+16(FP), R2 744 MOVD $SYS_connect, R8 745 SVC 746 MOVW R0, ret+24(FP) 747 RET 748 749 // int socket(int domain, int typ, int prot) 750 TEXT runtime·socket(SB),NOSPLIT,$0-20 751 MOVW domain+0(FP), R0 752 MOVW typ+4(FP), R1 753 MOVW prot+8(FP), R2 754 MOVD $SYS_socket, R8 755 SVC 756 MOVW R0, ret+16(FP) 757 RET 758 759 // func sbrk0() uintptr 760 TEXT runtime·sbrk0(SB),NOSPLIT,$0-8 761 // Implemented as brk(NULL). 762 MOVD $0, R0 763 MOVD $SYS_brk, R8 764 SVC 765 MOVD R0, ret+0(FP) 766 RET 767 768 TEXT runtime·sigreturn(SB),NOSPLIT,$0-0 769 RET