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 53TEXT 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) 60TEXT 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 70TEXT 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 80done: 81 MOVW R0, ret+16(FP) 82 RET 83 84TEXT 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 91done: 92 MOVW R0, ret+8(FP) 93 RET 94 95TEXT 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 104TEXT 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) 114TEXT 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) 123TEXT 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 131TEXT 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 150TEXT runtime·gettid(SB),NOSPLIT,$0-4 151 MOVD $SYS_gettid, R8 152 SVC 153 MOVW R0, ret+0(FP) 154 RET 155 156TEXT 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 169TEXT 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 178TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8 179 MOVD $SYS_getpid, R8 180 SVC 181 MOVD R0, ret+0(FP) 182 RET 183 184TEXT ·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 192TEXT 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 200TEXT 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 walltime1() (sec int64, nsec int32) 210TEXT runtime·walltime1(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 MOVD LR, m_vdsoPC(R21) 218 MOVD R20, m_vdsoSP(R21) 219 220 MOVD m_curg(R21), R0 221 CMP g, R0 222 BNE noswitch 223 224 MOVD m_g0(R21), R3 225 MOVD (g_sched+gobuf_sp)(R3), R1 // Set RSP to g0 stack 226 227noswitch: 228 SUB $16, R1 229 BIC $15, R1 // Align for C code 230 MOVD R1, RSP 231 232 MOVW $CLOCK_REALTIME, R0 233 MOVD runtime·vdsoClockgettimeSym(SB), R2 234 CBZ R2, fallback 235 236 // Store g on gsignal's stack, so if we receive a signal 237 // during VDSO code we can find the g. 238 // If we don't have a signal stack, we won't receive signal, 239 // so don't bother saving g. 240 // When using cgo, we already saved g on TLS, also don't save 241 // g here. 242 // Also don't save g if we are already on the signal stack. 243 // We won't get a nested signal. 244 MOVBU runtime·iscgo(SB), R22 245 CBNZ R22, nosaveg 246 MOVD m_gsignal(R21), R22 // g.m.gsignal 247 CBZ R22, nosaveg 248 CMP g, R22 249 BEQ nosaveg 250 MOVD (g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo 251 MOVD g, (R22) 252 253 BL (R2) 254 255 MOVD ZR, (R22) // clear g slot, R22 is unchanged by C code 256 257 B finish 258 259nosaveg: 260 BL (R2) 261 B finish 262 263fallback: 264 MOVD $SYS_clock_gettime, R8 265 SVC 266 267finish: 268 MOVD 0(RSP), R3 // sec 269 MOVD 8(RSP), R5 // nsec 270 271 MOVD R20, RSP // restore SP 272 MOVD $0, m_vdsoSP(R21) // clear vdsoSP 273 274 MOVD R3, sec+0(FP) 275 MOVW R5, nsec+8(FP) 276 RET 277 278TEXT runtime·nanotime1(SB),NOSPLIT,$24-8 279 MOVD RSP, R20 // R20 is unchanged by C code 280 MOVD RSP, R1 281 282 MOVD g_m(g), R21 // R21 = m 283 284 // Set vdsoPC and vdsoSP for SIGPROF traceback. 285 MOVD LR, m_vdsoPC(R21) 286 MOVD R20, m_vdsoSP(R21) 287 288 MOVD m_curg(R21), R0 289 CMP g, R0 290 BNE noswitch 291 292 MOVD m_g0(R21), R3 293 MOVD (g_sched+gobuf_sp)(R3), R1 // Set RSP to g0 stack 294 295noswitch: 296 SUB $32, R1 297 BIC $15, R1 298 MOVD R1, RSP 299 300 MOVW $CLOCK_MONOTONIC, R0 301 MOVD runtime·vdsoClockgettimeSym(SB), R2 302 CBZ R2, fallback 303 304 // Store g on gsignal's stack, so if we receive a signal 305 // during VDSO code we can find the g. 306 // If we don't have a signal stack, we won't receive signal, 307 // so don't bother saving g. 308 // When using cgo, we already saved g on TLS, also don't save 309 // g here. 310 // Also don't save g if we are already on the signal stack. 311 // We won't get a nested signal. 312 MOVBU runtime·iscgo(SB), R22 313 CBNZ R22, nosaveg 314 MOVD m_gsignal(R21), R22 // g.m.gsignal 315 CBZ R22, nosaveg 316 CMP g, R22 317 BEQ nosaveg 318 MOVD (g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo 319 MOVD g, (R22) 320 321 BL (R2) 322 323 MOVD ZR, (R22) // clear g slot, R22 is unchanged by C code 324 325 B finish 326 327nosaveg: 328 BL (R2) 329 B finish 330 331fallback: 332 MOVD $SYS_clock_gettime, R8 333 SVC 334 335finish: 336 MOVD 0(RSP), R3 // sec 337 MOVD 8(RSP), R5 // nsec 338 339 MOVD R20, RSP // restore SP 340 MOVD $0, m_vdsoSP(R21) // clear vdsoSP 341 342 // sec is in R3, nsec in R5 343 // return nsec in R3 344 MOVD $1000000000, R4 345 MUL R4, R3 346 ADD R5, R3 347 MOVD R3, ret+0(FP) 348 RET 349 350TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28 351 MOVW how+0(FP), R0 352 MOVD new+8(FP), R1 353 MOVD old+16(FP), R2 354 MOVW size+24(FP), R3 355 MOVD $SYS_rt_sigprocmask, R8 356 SVC 357 CMN $4095, R0 358 BCC done 359 MOVD $0, R0 360 MOVD R0, (R0) // crash 361done: 362 RET 363 364TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36 365 MOVD sig+0(FP), R0 366 MOVD new+8(FP), R1 367 MOVD old+16(FP), R2 368 MOVD size+24(FP), R3 369 MOVD $SYS_rt_sigaction, R8 370 SVC 371 MOVW R0, ret+32(FP) 372 RET 373 374// Call the function stored in _cgo_sigaction using the GCC calling convention. 375TEXT runtime·callCgoSigaction(SB),NOSPLIT,$0 376 MOVD sig+0(FP), R0 377 MOVD new+8(FP), R1 378 MOVD old+16(FP), R2 379 MOVD _cgo_sigaction(SB), R3 380 SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. 381 BL R3 382 ADD $16, RSP 383 MOVW R0, ret+24(FP) 384 RET 385 386TEXT runtime·sigfwd(SB),NOSPLIT,$0-32 387 MOVW sig+8(FP), R0 388 MOVD info+16(FP), R1 389 MOVD ctx+24(FP), R2 390 MOVD fn+0(FP), R11 391 BL (R11) 392 RET 393 394TEXT runtime·sigtramp(SB),NOSPLIT,$192 395 // Save callee-save registers in the case of signal forwarding. 396 // Please refer to https://golang.org/issue/31827 . 397 MOVD R19, 8*4(RSP) 398 MOVD R20, 8*5(RSP) 399 MOVD R21, 8*6(RSP) 400 MOVD R22, 8*7(RSP) 401 MOVD R23, 8*8(RSP) 402 MOVD R24, 8*9(RSP) 403 MOVD R25, 8*10(RSP) 404 MOVD R26, 8*11(RSP) 405 MOVD R27, 8*12(RSP) 406 MOVD g, 8*13(RSP) 407 MOVD R29, 8*14(RSP) 408 FMOVD F8, 8*15(RSP) 409 FMOVD F9, 8*16(RSP) 410 FMOVD F10, 8*17(RSP) 411 FMOVD F11, 8*18(RSP) 412 FMOVD F12, 8*19(RSP) 413 FMOVD F13, 8*20(RSP) 414 FMOVD F14, 8*21(RSP) 415 FMOVD F15, 8*22(RSP) 416 417 // this might be called in external code context, 418 // where g is not set. 419 // first save R0, because runtime·load_g will clobber it 420 MOVW R0, 8(RSP) 421 MOVBU runtime·iscgo(SB), R0 422 CMP $0, R0 423 BEQ 2(PC) 424 BL runtime·load_g(SB) 425 426 MOVD R1, 16(RSP) 427 MOVD R2, 24(RSP) 428 MOVD $runtime·sigtrampgo(SB), R0 429 BL (R0) 430 431 // Restore callee-save registers. 432 MOVD 8*4(RSP), R19 433 MOVD 8*5(RSP), R20 434 MOVD 8*6(RSP), R21 435 MOVD 8*7(RSP), R22 436 MOVD 8*8(RSP), R23 437 MOVD 8*9(RSP), R24 438 MOVD 8*10(RSP), R25 439 MOVD 8*11(RSP), R26 440 MOVD 8*12(RSP), R27 441 MOVD 8*13(RSP), g 442 MOVD 8*14(RSP), R29 443 FMOVD 8*15(RSP), F8 444 FMOVD 8*16(RSP), F9 445 FMOVD 8*17(RSP), F10 446 FMOVD 8*18(RSP), F11 447 FMOVD 8*19(RSP), F12 448 FMOVD 8*20(RSP), F13 449 FMOVD 8*21(RSP), F14 450 FMOVD 8*22(RSP), F15 451 452 RET 453 454TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0 455 MOVD $runtime·sigtramp(SB), R3 456 B (R3) 457 458TEXT runtime·sysMmap(SB),NOSPLIT|NOFRAME,$0 459 MOVD addr+0(FP), R0 460 MOVD n+8(FP), R1 461 MOVW prot+16(FP), R2 462 MOVW flags+20(FP), R3 463 MOVW fd+24(FP), R4 464 MOVW off+28(FP), R5 465 466 MOVD $SYS_mmap, R8 467 SVC 468 CMN $4095, R0 469 BCC ok 470 NEG R0,R0 471 MOVD $0, p+32(FP) 472 MOVD R0, err+40(FP) 473 RET 474ok: 475 MOVD R0, p+32(FP) 476 MOVD $0, err+40(FP) 477 RET 478 479// Call the function stored in _cgo_mmap using the GCC calling convention. 480// This must be called on the system stack. 481TEXT runtime·callCgoMmap(SB),NOSPLIT,$0 482 MOVD addr+0(FP), R0 483 MOVD n+8(FP), R1 484 MOVW prot+16(FP), R2 485 MOVW flags+20(FP), R3 486 MOVW fd+24(FP), R4 487 MOVW off+28(FP), R5 488 MOVD _cgo_mmap(SB), R9 489 SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. 490 BL R9 491 ADD $16, RSP 492 MOVD R0, ret+32(FP) 493 RET 494 495TEXT runtime·sysMunmap(SB),NOSPLIT|NOFRAME,$0 496 MOVD addr+0(FP), R0 497 MOVD n+8(FP), R1 498 MOVD $SYS_munmap, R8 499 SVC 500 CMN $4095, R0 501 BCC cool 502 MOVD R0, 0xf0(R0) 503cool: 504 RET 505 506// Call the function stored in _cgo_munmap using the GCC calling convention. 507// This must be called on the system stack. 508TEXT runtime·callCgoMunmap(SB),NOSPLIT,$0 509 MOVD addr+0(FP), R0 510 MOVD n+8(FP), R1 511 MOVD _cgo_munmap(SB), R9 512 SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. 513 BL R9 514 ADD $16, RSP 515 RET 516 517TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0 518 MOVD addr+0(FP), R0 519 MOVD n+8(FP), R1 520 MOVW flags+16(FP), R2 521 MOVD $SYS_madvise, R8 522 SVC 523 MOVW R0, ret+24(FP) 524 RET 525 526// int64 futex(int32 *uaddr, int32 op, int32 val, 527// struct timespec *timeout, int32 *uaddr2, int32 val2); 528TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0 529 MOVD addr+0(FP), R0 530 MOVW op+8(FP), R1 531 MOVW val+12(FP), R2 532 MOVD ts+16(FP), R3 533 MOVD addr2+24(FP), R4 534 MOVW val3+32(FP), R5 535 MOVD $SYS_futex, R8 536 SVC 537 MOVW R0, ret+40(FP) 538 RET 539 540// int64 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void)); 541TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0 542 MOVW flags+0(FP), R0 543 MOVD stk+8(FP), R1 544 545 // Copy mp, gp, fn off parent stack for use by child. 546 MOVD mp+16(FP), R10 547 MOVD gp+24(FP), R11 548 MOVD fn+32(FP), R12 549 550 MOVD R10, -8(R1) 551 MOVD R11, -16(R1) 552 MOVD R12, -24(R1) 553 MOVD $1234, R10 554 MOVD R10, -32(R1) 555 556 MOVD $SYS_clone, R8 557 SVC 558 559 // In parent, return. 560 CMP ZR, R0 561 BEQ child 562 MOVW R0, ret+40(FP) 563 RET 564child: 565 566 // In child, on new stack. 567 MOVD -32(RSP), R10 568 MOVD $1234, R0 569 CMP R0, R10 570 BEQ good 571 MOVD $0, R0 572 MOVD R0, (R0) // crash 573 574good: 575 // Initialize m->procid to Linux tid 576 MOVD $SYS_gettid, R8 577 SVC 578 579 MOVD -24(RSP), R12 // fn 580 MOVD -16(RSP), R11 // g 581 MOVD -8(RSP), R10 // m 582 583 CMP $0, R10 584 BEQ nog 585 CMP $0, R11 586 BEQ nog 587 588 MOVD R0, m_procid(R10) 589 590 // TODO: setup TLS. 591 592 // In child, set up new stack 593 MOVD R10, g_m(R11) 594 MOVD R11, g 595 //CALL runtime·stackcheck(SB) 596 597nog: 598 // Call fn 599 MOVD R12, R0 600 BL (R0) 601 602 // It shouldn't return. If it does, exit that thread. 603 MOVW $111, R0 604again: 605 MOVD $SYS_exit, R8 606 SVC 607 B again // keep exiting 608 609TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0 610 MOVD new+0(FP), R0 611 MOVD old+8(FP), R1 612 MOVD $SYS_sigaltstack, R8 613 SVC 614 CMN $4095, R0 615 BCC ok 616 MOVD $0, R0 617 MOVD R0, (R0) // crash 618ok: 619 RET 620 621TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0 622 MOVD $SYS_sched_yield, R8 623 SVC 624 RET 625 626TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0 627 MOVD pid+0(FP), R0 628 MOVD len+8(FP), R1 629 MOVD buf+16(FP), R2 630 MOVD $SYS_sched_getaffinity, R8 631 SVC 632 MOVW R0, ret+24(FP) 633 RET 634 635// int32 runtime·epollcreate(int32 size); 636TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0 637 MOVW $0, R0 638 MOVD $SYS_epoll_create1, R8 639 SVC 640 MOVW R0, ret+8(FP) 641 RET 642 643// int32 runtime·epollcreate1(int32 flags); 644TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0 645 MOVW flags+0(FP), R0 646 MOVD $SYS_epoll_create1, R8 647 SVC 648 MOVW R0, ret+8(FP) 649 RET 650 651// func epollctl(epfd, op, fd int32, ev *epollEvent) int 652TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0 653 MOVW epfd+0(FP), R0 654 MOVW op+4(FP), R1 655 MOVW fd+8(FP), R2 656 MOVD ev+16(FP), R3 657 MOVD $SYS_epoll_ctl, R8 658 SVC 659 MOVW R0, ret+24(FP) 660 RET 661 662// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout); 663TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0 664 MOVW epfd+0(FP), R0 665 MOVD ev+8(FP), R1 666 MOVW nev+16(FP), R2 667 MOVW timeout+20(FP), R3 668 MOVD $0, R4 669 MOVD $SYS_epoll_pwait, R8 670 SVC 671 MOVW R0, ret+24(FP) 672 RET 673 674// void runtime·closeonexec(int32 fd); 675TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0 676 MOVW fd+0(FP), R0 // fd 677 MOVD $2, R1 // F_SETFD 678 MOVD $1, R2 // FD_CLOEXEC 679 MOVD $SYS_fcntl, R8 680 SVC 681 RET 682 683// func runtime·setNonblock(int32 fd) 684TEXT runtime·setNonblock(SB),NOSPLIT|NOFRAME,$0-4 685 MOVW fd+0(FP), R0 // fd 686 MOVD $3, R1 // F_GETFL 687 MOVD $0, R2 688 MOVD $SYS_fcntl, R8 689 SVC 690 MOVD $0x800, R2 // O_NONBLOCK 691 ORR R0, R2 692 MOVW fd+0(FP), R0 // fd 693 MOVD $4, R1 // F_SETFL 694 MOVD $SYS_fcntl, R8 695 SVC 696 RET 697 698// int access(const char *name, int mode) 699TEXT runtime·access(SB),NOSPLIT,$0-20 700 MOVD $AT_FDCWD, R0 701 MOVD name+0(FP), R1 702 MOVW mode+8(FP), R2 703 MOVD $SYS_faccessat, R8 704 SVC 705 MOVW R0, ret+16(FP) 706 RET 707 708// int connect(int fd, const struct sockaddr *addr, socklen_t len) 709TEXT runtime·connect(SB),NOSPLIT,$0-28 710 MOVW fd+0(FP), R0 711 MOVD addr+8(FP), R1 712 MOVW len+16(FP), R2 713 MOVD $SYS_connect, R8 714 SVC 715 MOVW R0, ret+24(FP) 716 RET 717 718// int socket(int domain, int typ, int prot) 719TEXT runtime·socket(SB),NOSPLIT,$0-20 720 MOVW domain+0(FP), R0 721 MOVW typ+4(FP), R1 722 MOVW prot+8(FP), R2 723 MOVD $SYS_socket, R8 724 SVC 725 MOVW R0, ret+16(FP) 726 RET 727 728// func sbrk0() uintptr 729TEXT runtime·sbrk0(SB),NOSPLIT,$0-8 730 // Implemented as brk(NULL). 731 MOVD $0, R0 732 MOVD $SYS_brk, R8 733 SVC 734 MOVD R0, ret+0(FP) 735 RET 736 737TEXT runtime·sigreturn(SB),NOSPLIT,$0-0 738 RET 739