rsc.io/go@v0.0.0-20150416155037-e040fd465409/src/runtime/sys_darwin_amd64.s (about) 1 // Copyright 2009 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 AMD64, Darwin 7 // See http://fxr.watson.org/fxr/source/bsd/kern/syscalls.c?v=xnu-1228 8 // or /usr/include/sys/syscall.h (on a Mac) for system call numbers. 9 // 10 // The low 24 bits are the system call number. 11 // The high 8 bits specify the kind of system call: 1=Mach, 2=BSD, 3=Machine-Dependent. 12 // 13 14 #include "go_asm.h" 15 #include "go_tls.h" 16 #include "textflag.h" 17 18 // Exit the entire program (like C exit) 19 TEXT runtime·exit(SB),NOSPLIT,$0 20 MOVL code+0(FP), DI // arg 1 exit status 21 MOVL $(0x2000000+1), AX // syscall entry 22 SYSCALL 23 MOVL $0xf1, 0xf1 // crash 24 RET 25 26 // Exit this OS thread (like pthread_exit, which eventually 27 // calls __bsdthread_terminate). 28 TEXT runtime·exit1(SB),NOSPLIT,$0 29 MOVL code+0(FP), DI // arg 1 exit status 30 MOVL $(0x2000000+361), AX // syscall entry 31 SYSCALL 32 MOVL $0xf1, 0xf1 // crash 33 RET 34 35 TEXT runtime·open(SB),NOSPLIT,$0 36 MOVQ name+0(FP), DI // arg 1 pathname 37 MOVL mode+8(FP), SI // arg 2 flags 38 MOVL perm+12(FP), DX // arg 3 mode 39 MOVL $(0x2000000+5), AX // syscall entry 40 SYSCALL 41 JCC 2(PC) 42 MOVL $-1, AX 43 MOVL AX, ret+16(FP) 44 RET 45 46 TEXT runtime·closefd(SB),NOSPLIT,$0 47 MOVL fd+0(FP), DI // arg 1 fd 48 MOVL $(0x2000000+6), AX // syscall entry 49 SYSCALL 50 JCC 2(PC) 51 MOVL $-1, AX 52 MOVL AX, ret+8(FP) 53 RET 54 55 TEXT runtime·read(SB),NOSPLIT,$0 56 MOVL fd+0(FP), DI // arg 1 fd 57 MOVQ p+8(FP), SI // arg 2 buf 58 MOVL n+16(FP), DX // arg 3 count 59 MOVL $(0x2000000+3), AX // syscall entry 60 SYSCALL 61 JCC 2(PC) 62 MOVL $-1, AX 63 MOVL AX, ret+24(FP) 64 RET 65 66 TEXT runtime·write(SB),NOSPLIT,$0 67 MOVQ fd+0(FP), DI // arg 1 fd 68 MOVQ p+8(FP), SI // arg 2 buf 69 MOVL n+16(FP), DX // arg 3 count 70 MOVL $(0x2000000+4), AX // syscall entry 71 SYSCALL 72 JCC 2(PC) 73 MOVL $-1, AX 74 MOVL AX, ret+24(FP) 75 RET 76 77 TEXT runtime·raise(SB),NOSPLIT,$0 78 // Ideally we'd send the signal to the current thread, 79 // not the whole process, but that's too hard on OS X. 80 JMP runtime·raiseproc(SB) 81 82 TEXT runtime·raiseproc(SB),NOSPLIT,$24 83 MOVL $(0x2000000+20), AX // getpid 84 SYSCALL 85 MOVQ AX, DI // arg 1 - pid 86 MOVL sig+0(FP), SI // arg 2 - signal 87 MOVL $1, DX // arg 3 - posix 88 MOVL $(0x2000000+37), AX // kill 89 SYSCALL 90 RET 91 92 TEXT runtime·setitimer(SB), NOSPLIT, $0 93 MOVL mode+0(FP), DI 94 MOVQ new+8(FP), SI 95 MOVQ old+16(FP), DX 96 MOVL $(0x2000000+83), AX // syscall entry 97 SYSCALL 98 RET 99 100 TEXT runtime·madvise(SB), NOSPLIT, $0 101 MOVQ addr+0(FP), DI // arg 1 addr 102 MOVQ n+8(FP), SI // arg 2 len 103 MOVL flags+16(FP), DX // arg 3 advice 104 MOVL $(0x2000000+75), AX // syscall entry madvise 105 SYSCALL 106 // ignore failure - maybe pages are locked 107 RET 108 109 // OS X comm page time offsets 110 // http://www.opensource.apple.com/source/xnu/xnu-1699.26.8/osfmk/i386/cpu_capabilities.h 111 #define nt_tsc_base 0x50 112 #define nt_scale 0x58 113 #define nt_shift 0x5c 114 #define nt_ns_base 0x60 115 #define nt_generation 0x68 116 #define gtod_generation 0x6c 117 #define gtod_ns_base 0x70 118 #define gtod_sec_base 0x78 119 120 TEXT nanotime<>(SB), NOSPLIT, $32 121 MOVQ $0x7fffffe00000, BP /* comm page base */ 122 // Loop trying to take a consistent snapshot 123 // of the time parameters. 124 timeloop: 125 MOVL gtod_generation(BP), R8 126 TESTL R8, R8 127 JZ systime 128 MOVL nt_generation(BP), R9 129 TESTL R9, R9 130 JZ timeloop 131 RDTSC 132 MOVQ nt_tsc_base(BP), R10 133 MOVL nt_scale(BP), R11 134 MOVQ nt_ns_base(BP), R12 135 CMPL nt_generation(BP), R9 136 JNE timeloop 137 MOVQ gtod_ns_base(BP), R13 138 MOVQ gtod_sec_base(BP), R14 139 CMPL gtod_generation(BP), R8 140 JNE timeloop 141 142 // Gathered all the data we need. Compute time. 143 // ((tsc - nt_tsc_base) * nt_scale) >> 32 + nt_ns_base - gtod_ns_base + gtod_sec_base*1e9 144 // The multiply and shift extracts the top 64 bits of the 96-bit product. 145 SHLQ $32, DX 146 ADDQ DX, AX 147 SUBQ R10, AX 148 MULQ R11 149 SHRQ $32, AX:DX 150 ADDQ R12, AX 151 SUBQ R13, AX 152 IMULQ $1000000000, R14 153 ADDQ R14, AX 154 RET 155 156 systime: 157 // Fall back to system call (usually first call in this thread). 158 MOVQ SP, DI // must be non-nil, unused 159 MOVQ $0, SI 160 MOVL $(0x2000000+116), AX 161 SYSCALL 162 // sec is in AX, usec in DX 163 // return nsec in AX 164 IMULQ $1000000000, AX 165 IMULQ $1000, DX 166 ADDQ DX, AX 167 RET 168 169 TEXT runtime·nanotime(SB),NOSPLIT,$0-8 170 CALL nanotime<>(SB) 171 MOVQ AX, ret+0(FP) 172 RET 173 174 // func now() (sec int64, nsec int32) 175 TEXT time·now(SB),NOSPLIT,$0-12 176 CALL nanotime<>(SB) 177 178 // generated code for 179 // func f(x uint64) (uint64, uint64) { return x/1000000000, x%100000000 } 180 // adapted to reduce duplication 181 MOVQ AX, CX 182 MOVQ $1360296554856532783, AX 183 MULQ CX 184 ADDQ CX, DX 185 RCRQ $1, DX 186 SHRQ $29, DX 187 MOVQ DX, sec+0(FP) 188 IMULQ $1000000000, DX 189 SUBQ DX, CX 190 MOVL CX, nsec+8(FP) 191 RET 192 193 TEXT runtime·sigprocmask(SB),NOSPLIT,$0 194 MOVL sig+0(FP), DI 195 MOVQ new+8(FP), SI 196 MOVQ old+16(FP), DX 197 MOVL $(0x2000000+329), AX // pthread_sigmask (on OS X, sigprocmask==entire process) 198 SYSCALL 199 JCC 2(PC) 200 MOVL $0xf1, 0xf1 // crash 201 RET 202 203 TEXT runtime·sigaction(SB),NOSPLIT,$0 204 MOVL mode+0(FP), DI // arg 1 sig 205 MOVQ new+8(FP), SI // arg 2 act 206 MOVQ old+16(FP), DX // arg 3 oact 207 MOVQ old+16(FP), CX // arg 3 oact 208 MOVQ old+16(FP), R10 // arg 3 oact 209 MOVL $(0x2000000+46), AX // syscall entry 210 SYSCALL 211 JCC 2(PC) 212 MOVL $0xf1, 0xf1 // crash 213 RET 214 215 TEXT runtime·sigtramp(SB),NOSPLIT,$64 216 get_tls(BX) 217 218 MOVQ R8, 32(SP) // save ucontext 219 MOVQ SI, 40(SP) // save infostyle 220 221 // check that g exists 222 MOVQ g(BX), R10 223 CMPQ R10, $0 224 JNE 5(PC) 225 MOVL DX, 0(SP) 226 MOVQ $runtime·badsignal(SB), AX 227 CALL AX 228 JMP ret 229 230 // save g 231 MOVQ R10, 48(SP) 232 233 // g = m->gsignal 234 MOVQ g_m(R10), BP 235 MOVQ m_gsignal(BP), BP 236 MOVQ BP, g(BX) 237 238 MOVL DX, 0(SP) 239 MOVQ CX, 8(SP) 240 MOVQ R8, 16(SP) 241 MOVQ R10, 24(SP) 242 243 CALL DI 244 245 // restore g 246 get_tls(BX) 247 MOVQ 48(SP), R10 248 MOVQ R10, g(BX) 249 250 ret: 251 // call sigreturn 252 MOVL $(0x2000000+184), AX // sigreturn(ucontext, infostyle) 253 MOVQ 32(SP), DI // saved ucontext 254 MOVQ 40(SP), SI // saved infostyle 255 SYSCALL 256 INT $3 // not reached 257 258 TEXT runtime·mmap(SB),NOSPLIT,$0 259 MOVQ addr+0(FP), DI // arg 1 addr 260 MOVQ n+8(FP), SI // arg 2 len 261 MOVL prot+16(FP), DX // arg 3 prot 262 MOVL flags+20(FP), R10 // arg 4 flags 263 MOVL fd+24(FP), R8 // arg 5 fid 264 MOVL off+28(FP), R9 // arg 6 offset 265 MOVL $(0x2000000+197), AX // syscall entry 266 SYSCALL 267 MOVQ AX, ret+32(FP) 268 RET 269 270 TEXT runtime·munmap(SB),NOSPLIT,$0 271 MOVQ addr+0(FP), DI // arg 1 addr 272 MOVQ n+8(FP), SI // arg 2 len 273 MOVL $(0x2000000+73), AX // syscall entry 274 SYSCALL 275 JCC 2(PC) 276 MOVL $0xf1, 0xf1 // crash 277 RET 278 279 TEXT runtime·sigaltstack(SB),NOSPLIT,$0 280 MOVQ new+8(SP), DI 281 MOVQ old+16(SP), SI 282 MOVQ $(0x2000000+53), AX 283 SYSCALL 284 JCC 2(PC) 285 MOVL $0xf1, 0xf1 // crash 286 RET 287 288 TEXT runtime·usleep(SB),NOSPLIT,$16 289 MOVL $0, DX 290 MOVL usec+0(FP), AX 291 MOVL $1000000, CX 292 DIVL CX 293 MOVQ AX, 0(SP) // sec 294 MOVL DX, 8(SP) // usec 295 296 // select(0, 0, 0, 0, &tv) 297 MOVL $0, DI 298 MOVL $0, SI 299 MOVL $0, DX 300 MOVL $0, R10 301 MOVQ SP, R8 302 MOVL $(0x2000000+93), AX 303 SYSCALL 304 RET 305 306 // func bsdthread_create(stk, arg unsafe.Pointer, fn uintptr) int32 307 TEXT runtime·bsdthread_create(SB),NOSPLIT,$0 308 // Set up arguments to bsdthread_create system call. 309 // The ones in quotes pass through to the thread callback 310 // uninterpreted, so we can put whatever we want there. 311 MOVQ fn+24(SP), DI 312 MOVQ arg+16(SP), SI 313 MOVQ stk+8(SP), DX 314 MOVQ $0x01000000, R8 // flags = PTHREAD_START_CUSTOM 315 MOVQ $0, R9 // paranoia 316 MOVQ $0, R10 // paranoia, "pthread" 317 MOVQ $(0x2000000+360), AX // bsdthread_create 318 SYSCALL 319 JCC 4(PC) 320 NEGQ AX 321 MOVL AX, ret+32(FP) 322 RET 323 MOVL $0, AX 324 MOVL AX, ret+32(FP) 325 RET 326 327 // The thread that bsdthread_create creates starts executing here, 328 // because we registered this function using bsdthread_register 329 // at startup. 330 // DI = "pthread" 331 // SI = mach thread port 332 // DX = "func" (= fn) 333 // CX = "arg" (= m) 334 // R8 = stack 335 // R9 = flags (= 0) 336 // SP = stack - C_64_REDZONE_LEN (= stack - 128) 337 TEXT runtime·bsdthread_start(SB),NOSPLIT,$0 338 MOVQ R8, SP // empirically, SP is very wrong but R8 is right 339 340 PUSHQ DX 341 PUSHQ CX 342 PUSHQ SI 343 344 // set up thread local storage pointing at m->tls. 345 LEAQ m_tls(CX), DI 346 CALL runtime·settls(SB) 347 348 POPQ SI 349 POPQ CX 350 POPQ DX 351 352 get_tls(BX) 353 MOVQ SI, m_procid(CX) // thread port is m->procid 354 MOVQ m_g0(CX), AX 355 MOVQ AX, g(BX) 356 MOVQ CX, g_m(AX) 357 CALL runtime·stackcheck(SB) // smashes AX, CX 358 CALL DX // fn 359 CALL runtime·exit1(SB) 360 RET 361 362 // func bsdthread_register() int32 363 // registers callbacks for threadstart (see bsdthread_create above 364 // and wqthread and pthsize (not used). returns 0 on success. 365 TEXT runtime·bsdthread_register(SB),NOSPLIT,$0 366 MOVQ $runtime·bsdthread_start(SB), DI // threadstart 367 MOVQ $0, SI // wqthread, not used by us 368 MOVQ $0, DX // pthsize, not used by us 369 MOVQ $0, R10 // dummy_value [sic] 370 MOVQ $0, R8 // targetconc_ptr 371 MOVQ $0, R9 // dispatchqueue_offset 372 MOVQ $(0x2000000+366), AX // bsdthread_register 373 SYSCALL 374 JCC 4(PC) 375 NEGQ AX 376 MOVL AX, ret+0(FP) 377 RET 378 MOVL $0, AX 379 MOVL AX, ret+0(FP) 380 RET 381 382 // Mach system calls use 0x1000000 instead of the BSD's 0x2000000. 383 384 // func mach_msg_trap(h unsafe.Pointer, op int32, send_size, rcv_size, rcv_name, timeout, notify uint32) int32 385 TEXT runtime·mach_msg_trap(SB),NOSPLIT,$0 386 MOVQ h+0(FP), DI 387 MOVL op+8(FP), SI 388 MOVL send_size+12(FP), DX 389 MOVL rcv_size+16(FP), R10 390 MOVL rcv_name+20(FP), R8 391 MOVL timeout+24(FP), R9 392 MOVL notify+28(FP), R11 393 PUSHQ R11 // seventh arg, on stack 394 MOVL $(0x1000000+31), AX // mach_msg_trap 395 SYSCALL 396 POPQ R11 397 MOVL AX, ret+32(FP) 398 RET 399 400 TEXT runtime·mach_task_self(SB),NOSPLIT,$0 401 MOVL $(0x1000000+28), AX // task_self_trap 402 SYSCALL 403 MOVL AX, ret+0(FP) 404 RET 405 406 TEXT runtime·mach_thread_self(SB),NOSPLIT,$0 407 MOVL $(0x1000000+27), AX // thread_self_trap 408 SYSCALL 409 MOVL AX, ret+0(FP) 410 RET 411 412 TEXT runtime·mach_reply_port(SB),NOSPLIT,$0 413 MOVL $(0x1000000+26), AX // mach_reply_port 414 SYSCALL 415 MOVL AX, ret+0(FP) 416 RET 417 418 // Mach provides trap versions of the semaphore ops, 419 // instead of requiring the use of RPC. 420 421 // func mach_semaphore_wait(sema uint32) int32 422 TEXT runtime·mach_semaphore_wait(SB),NOSPLIT,$0 423 MOVL sema+0(FP), DI 424 MOVL $(0x1000000+36), AX // semaphore_wait_trap 425 SYSCALL 426 MOVL AX, ret+8(FP) 427 RET 428 429 // func mach_semaphore_timedwait(sema, sec, nsec uint32) int32 430 TEXT runtime·mach_semaphore_timedwait(SB),NOSPLIT,$0 431 MOVL sema+0(FP), DI 432 MOVL sec+4(FP), SI 433 MOVL nsec+8(FP), DX 434 MOVL $(0x1000000+38), AX // semaphore_timedwait_trap 435 SYSCALL 436 MOVL AX, ret+16(FP) 437 RET 438 439 // func mach_semaphore_signal(sema uint32) int32 440 TEXT runtime·mach_semaphore_signal(SB),NOSPLIT,$0 441 MOVL sema+0(FP), DI 442 MOVL $(0x1000000+33), AX // semaphore_signal_trap 443 SYSCALL 444 MOVL AX, ret+8(FP) 445 RET 446 447 // func mach_semaphore_signal_all(sema uint32) int32 448 TEXT runtime·mach_semaphore_signal_all(SB),NOSPLIT,$0 449 MOVL sema+0(FP), DI 450 MOVL $(0x1000000+34), AX // semaphore_signal_all_trap 451 SYSCALL 452 MOVL AX, ret+8(FP) 453 RET 454 455 // set tls base to DI 456 TEXT runtime·settls(SB),NOSPLIT,$32 457 /* 458 * Same as in sys_darwin_386.s:/ugliness, different constant. 459 * See cgo/gcc_darwin_amd64.c for the derivation 460 * of the constant. 461 */ 462 SUBQ $0x8a0, DI 463 464 MOVL $(0x3000000+3), AX // thread_fast_set_cthread_self - machdep call #3 465 SYSCALL 466 RET 467 468 TEXT runtime·sysctl(SB),NOSPLIT,$0 469 MOVQ mib+0(FP), DI 470 MOVL miblen+8(FP), SI 471 MOVQ out+16(FP), DX 472 MOVQ size+24(FP), R10 473 MOVQ dst+32(FP), R8 474 MOVQ ndst+40(FP), R9 475 MOVL $(0x2000000+202), AX // syscall entry 476 SYSCALL 477 JCC 4(PC) 478 NEGQ AX 479 MOVL AX, ret+48(FP) 480 RET 481 MOVL $0, AX 482 MOVL AX, ret+48(FP) 483 RET 484 485 // func kqueue() int32 486 TEXT runtime·kqueue(SB),NOSPLIT,$0 487 MOVQ $0, DI 488 MOVQ $0, SI 489 MOVQ $0, DX 490 MOVL $(0x2000000+362), AX 491 SYSCALL 492 JCC 2(PC) 493 NEGQ AX 494 MOVL AX, ret+0(FP) 495 RET 496 497 // func kevent(kq int32, ch *keventt, nch int32, ev *keventt, nev int32, ts *timespec) int32 498 TEXT runtime·kevent(SB),NOSPLIT,$0 499 MOVL kq+0(FP), DI 500 MOVQ ch+8(FP), SI 501 MOVL nch+16(FP), DX 502 MOVQ ev+24(FP), R10 503 MOVL nev+32(FP), R8 504 MOVQ ts+40(FP), R9 505 MOVL $(0x2000000+363), AX 506 SYSCALL 507 JCC 2(PC) 508 NEGQ AX 509 MOVL AX, ret+48(FP) 510 RET 511 512 // func closeonexec(fd int32) 513 TEXT runtime·closeonexec(SB),NOSPLIT,$0 514 MOVL fd+0(FP), DI // fd 515 MOVQ $2, SI // F_SETFD 516 MOVQ $1, DX // FD_CLOEXEC 517 MOVL $(0x2000000+92), AX // fcntl 518 SYSCALL 519 RET