github.com/4ad/go@v0.0.0-20161219182952-69a12818b605/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 159 MOVQ $0, SI 160 MOVQ $0, DX // required as of Sierra; Issue 16570 161 MOVL $(0x2000000+116), AX 162 SYSCALL 163 CMPQ AX, $0 164 JNE inreg 165 MOVQ 0(SP), AX 166 MOVL 8(SP), DX 167 inreg: 168 // sec is in AX, usec in DX 169 // return nsec in AX 170 IMULQ $1000000000, AX 171 IMULQ $1000, DX 172 ADDQ DX, AX 173 RET 174 175 TEXT runtime·nanotime(SB),NOSPLIT,$0-8 176 CALL nanotime<>(SB) 177 MOVQ AX, ret+0(FP) 178 RET 179 180 // func now() (sec int64, nsec int32) 181 TEXT time·now(SB),NOSPLIT,$0-12 182 CALL nanotime<>(SB) 183 184 // generated code for 185 // func f(x uint64) (uint64, uint64) { return x/1000000000, x%1000000000 } 186 // adapted to reduce duplication 187 MOVQ AX, CX 188 MOVQ $1360296554856532783, AX 189 MULQ CX 190 ADDQ CX, DX 191 RCRQ $1, DX 192 SHRQ $29, DX 193 MOVQ DX, sec+0(FP) 194 IMULQ $1000000000, DX 195 SUBQ DX, CX 196 MOVL CX, nsec+8(FP) 197 RET 198 199 TEXT runtime·sigprocmask(SB),NOSPLIT,$0 200 MOVL sig+0(FP), DI 201 MOVQ new+8(FP), SI 202 MOVQ old+16(FP), DX 203 MOVL $(0x2000000+329), AX // pthread_sigmask (on OS X, sigprocmask==entire process) 204 SYSCALL 205 JCC 2(PC) 206 MOVL $0xf1, 0xf1 // crash 207 RET 208 209 TEXT runtime·sigaction(SB),NOSPLIT,$0-24 210 MOVL mode+0(FP), DI // arg 1 sig 211 MOVQ new+8(FP), SI // arg 2 act 212 MOVQ old+16(FP), DX // arg 3 oact 213 MOVQ old+16(FP), CX // arg 3 oact 214 MOVQ old+16(FP), R10 // arg 3 oact 215 MOVL $(0x2000000+46), AX // syscall entry 216 SYSCALL 217 JCC 2(PC) 218 MOVL $0xf1, 0xf1 // crash 219 RET 220 221 TEXT runtime·sigfwd(SB),NOSPLIT,$0-32 222 MOVQ fn+0(FP), AX 223 MOVL sig+8(FP), DI 224 MOVQ info+16(FP), SI 225 MOVQ ctx+24(FP), DX 226 MOVQ SP, BP 227 SUBQ $64, SP 228 ANDQ $~15, SP // alignment for x86_64 ABI 229 CALL AX 230 MOVQ BP, SP 231 RET 232 233 TEXT runtime·sigreturn(SB),NOSPLIT,$0-12 234 MOVQ ctx+0(FP), DI 235 MOVL infostyle+8(FP), SI 236 MOVL $(0x2000000+184), AX 237 SYSCALL 238 INT $3 // not reached 239 240 TEXT runtime·sigtramp(SB),NOSPLIT,$32 241 MOVQ DI, 0(SP) // fn 242 MOVL SI, 8(SP) // infostyle 243 MOVL DX, 12(SP) // sig 244 MOVQ CX, 16(SP) // info 245 MOVQ R8, 24(SP) // ctx 246 MOVQ $runtime·sigtrampgo(SB), AX 247 CALL AX 248 INT $3 // not reached (see issue 16453) 249 250 TEXT runtime·mmap(SB),NOSPLIT,$0 251 MOVQ addr+0(FP), DI // arg 1 addr 252 MOVQ n+8(FP), SI // arg 2 len 253 MOVL prot+16(FP), DX // arg 3 prot 254 MOVL flags+20(FP), R10 // arg 4 flags 255 MOVL fd+24(FP), R8 // arg 5 fid 256 MOVL off+28(FP), R9 // arg 6 offset 257 MOVL $(0x2000000+197), AX // syscall entry 258 SYSCALL 259 MOVQ AX, ret+32(FP) 260 RET 261 262 TEXT runtime·munmap(SB),NOSPLIT,$0 263 MOVQ addr+0(FP), DI // arg 1 addr 264 MOVQ n+8(FP), SI // arg 2 len 265 MOVL $(0x2000000+73), AX // syscall entry 266 SYSCALL 267 JCC 2(PC) 268 MOVL $0xf1, 0xf1 // crash 269 RET 270 271 TEXT runtime·sigaltstack(SB),NOSPLIT,$0 272 MOVQ new+0(FP), DI 273 MOVQ old+8(FP), SI 274 MOVQ $(0x2000000+53), AX 275 SYSCALL 276 JCC 2(PC) 277 MOVL $0xf1, 0xf1 // crash 278 RET 279 280 TEXT runtime·usleep(SB),NOSPLIT,$16 281 MOVL $0, DX 282 MOVL usec+0(FP), AX 283 MOVL $1000000, CX 284 DIVL CX 285 MOVQ AX, 0(SP) // sec 286 MOVL DX, 8(SP) // usec 287 288 // select(0, 0, 0, 0, &tv) 289 MOVL $0, DI 290 MOVL $0, SI 291 MOVL $0, DX 292 MOVL $0, R10 293 MOVQ SP, R8 294 MOVL $(0x2000000+93), AX 295 SYSCALL 296 RET 297 298 // func bsdthread_create(stk, arg unsafe.Pointer, fn uintptr) int32 299 TEXT runtime·bsdthread_create(SB),NOSPLIT,$0 300 // Set up arguments to bsdthread_create system call. 301 // The ones in quotes pass through to the thread callback 302 // uninterpreted, so we can put whatever we want there. 303 MOVQ fn+16(FP), DI 304 MOVQ arg+8(FP), SI 305 MOVQ stk+0(FP), DX 306 MOVQ $0x01000000, R8 // flags = PTHREAD_START_CUSTOM 307 MOVQ $0, R9 // paranoia 308 MOVQ $0, R10 // paranoia, "pthread" 309 MOVQ $(0x2000000+360), AX // bsdthread_create 310 SYSCALL 311 JCC 4(PC) 312 NEGQ AX 313 MOVL AX, ret+24(FP) 314 RET 315 MOVL $0, AX 316 MOVL AX, ret+24(FP) 317 RET 318 319 // The thread that bsdthread_create creates starts executing here, 320 // because we registered this function using bsdthread_register 321 // at startup. 322 // DI = "pthread" 323 // SI = mach thread port 324 // DX = "func" (= fn) 325 // CX = "arg" (= m) 326 // R8 = stack 327 // R9 = flags (= 0) 328 // SP = stack - C_64_REDZONE_LEN (= stack - 128) 329 TEXT runtime·bsdthread_start(SB),NOSPLIT,$0 330 MOVQ R8, SP // empirically, SP is very wrong but R8 is right 331 332 PUSHQ DX 333 PUSHQ CX 334 PUSHQ SI 335 336 // set up thread local storage pointing at m->tls. 337 LEAQ m_tls(CX), DI 338 CALL runtime·settls(SB) 339 340 POPQ SI 341 POPQ CX 342 POPQ DX 343 344 get_tls(BX) 345 MOVQ SI, m_procid(CX) // thread port is m->procid 346 MOVQ m_g0(CX), AX 347 MOVQ AX, g(BX) 348 MOVQ CX, g_m(AX) 349 CALL runtime·stackcheck(SB) // smashes AX, CX 350 CALL DX // fn 351 CALL runtime·exit1(SB) 352 RET 353 354 // func bsdthread_register() int32 355 // registers callbacks for threadstart (see bsdthread_create above 356 // and wqthread and pthsize (not used). returns 0 on success. 357 TEXT runtime·bsdthread_register(SB),NOSPLIT,$0 358 MOVQ $runtime·bsdthread_start(SB), DI // threadstart 359 MOVQ $0, SI // wqthread, not used by us 360 MOVQ $0, DX // pthsize, not used by us 361 MOVQ $0, R10 // dummy_value [sic] 362 MOVQ $0, R8 // targetconc_ptr 363 MOVQ $0, R9 // dispatchqueue_offset 364 MOVQ $(0x2000000+366), AX // bsdthread_register 365 SYSCALL 366 JCC 4(PC) 367 NEGQ AX 368 MOVL AX, ret+0(FP) 369 RET 370 MOVL $0, AX 371 MOVL AX, ret+0(FP) 372 RET 373 374 // Mach system calls use 0x1000000 instead of the BSD's 0x2000000. 375 376 // func mach_msg_trap(h unsafe.Pointer, op int32, send_size, rcv_size, rcv_name, timeout, notify uint32) int32 377 TEXT runtime·mach_msg_trap(SB),NOSPLIT,$0 378 MOVQ h+0(FP), DI 379 MOVL op+8(FP), SI 380 MOVL send_size+12(FP), DX 381 MOVL rcv_size+16(FP), R10 382 MOVL rcv_name+20(FP), R8 383 MOVL timeout+24(FP), R9 384 MOVL notify+28(FP), R11 385 PUSHQ R11 // seventh arg, on stack 386 MOVL $(0x1000000+31), AX // mach_msg_trap 387 SYSCALL 388 POPQ R11 389 MOVL AX, ret+32(FP) 390 RET 391 392 TEXT runtime·mach_task_self(SB),NOSPLIT,$0 393 MOVL $(0x1000000+28), AX // task_self_trap 394 SYSCALL 395 MOVL AX, ret+0(FP) 396 RET 397 398 TEXT runtime·mach_thread_self(SB),NOSPLIT,$0 399 MOVL $(0x1000000+27), AX // thread_self_trap 400 SYSCALL 401 MOVL AX, ret+0(FP) 402 RET 403 404 TEXT runtime·mach_reply_port(SB),NOSPLIT,$0 405 MOVL $(0x1000000+26), AX // mach_reply_port 406 SYSCALL 407 MOVL AX, ret+0(FP) 408 RET 409 410 // Mach provides trap versions of the semaphore ops, 411 // instead of requiring the use of RPC. 412 413 // func mach_semaphore_wait(sema uint32) int32 414 TEXT runtime·mach_semaphore_wait(SB),NOSPLIT,$0 415 MOVL sema+0(FP), DI 416 MOVL $(0x1000000+36), AX // semaphore_wait_trap 417 SYSCALL 418 MOVL AX, ret+8(FP) 419 RET 420 421 // func mach_semaphore_timedwait(sema, sec, nsec uint32) int32 422 TEXT runtime·mach_semaphore_timedwait(SB),NOSPLIT,$0 423 MOVL sema+0(FP), DI 424 MOVL sec+4(FP), SI 425 MOVL nsec+8(FP), DX 426 MOVL $(0x1000000+38), AX // semaphore_timedwait_trap 427 SYSCALL 428 MOVL AX, ret+16(FP) 429 RET 430 431 // func mach_semaphore_signal(sema uint32) int32 432 TEXT runtime·mach_semaphore_signal(SB),NOSPLIT,$0 433 MOVL sema+0(FP), DI 434 MOVL $(0x1000000+33), AX // semaphore_signal_trap 435 SYSCALL 436 MOVL AX, ret+8(FP) 437 RET 438 439 // func mach_semaphore_signal_all(sema uint32) int32 440 TEXT runtime·mach_semaphore_signal_all(SB),NOSPLIT,$0 441 MOVL sema+0(FP), DI 442 MOVL $(0x1000000+34), AX // semaphore_signal_all_trap 443 SYSCALL 444 MOVL AX, ret+8(FP) 445 RET 446 447 // set tls base to DI 448 TEXT runtime·settls(SB),NOSPLIT,$32 449 /* 450 * Same as in sys_darwin_386.s:/ugliness, different constant. 451 * See cgo/gcc_darwin_amd64.c for the derivation 452 * of the constant. 453 */ 454 SUBQ $0x8a0, DI 455 456 MOVL $(0x3000000+3), AX // thread_fast_set_cthread_self - machdep call #3 457 SYSCALL 458 RET 459 460 TEXT runtime·sysctl(SB),NOSPLIT,$0 461 MOVQ mib+0(FP), DI 462 MOVL miblen+8(FP), SI 463 MOVQ out+16(FP), DX 464 MOVQ size+24(FP), R10 465 MOVQ dst+32(FP), R8 466 MOVQ ndst+40(FP), R9 467 MOVL $(0x2000000+202), AX // syscall entry 468 SYSCALL 469 JCC 4(PC) 470 NEGQ AX 471 MOVL AX, ret+48(FP) 472 RET 473 MOVL $0, AX 474 MOVL AX, ret+48(FP) 475 RET 476 477 // func kqueue() int32 478 TEXT runtime·kqueue(SB),NOSPLIT,$0 479 MOVQ $0, DI 480 MOVQ $0, SI 481 MOVQ $0, DX 482 MOVL $(0x2000000+362), AX 483 SYSCALL 484 JCC 2(PC) 485 NEGQ AX 486 MOVL AX, ret+0(FP) 487 RET 488 489 // func kevent(kq int32, ch *keventt, nch int32, ev *keventt, nev int32, ts *timespec) int32 490 TEXT runtime·kevent(SB),NOSPLIT,$0 491 MOVL kq+0(FP), DI 492 MOVQ ch+8(FP), SI 493 MOVL nch+16(FP), DX 494 MOVQ ev+24(FP), R10 495 MOVL nev+32(FP), R8 496 MOVQ ts+40(FP), R9 497 MOVL $(0x2000000+363), AX 498 SYSCALL 499 JCC 2(PC) 500 NEGQ AX 501 MOVL AX, ret+48(FP) 502 RET 503 504 // func closeonexec(fd int32) 505 TEXT runtime·closeonexec(SB),NOSPLIT,$0 506 MOVL fd+0(FP), DI // fd 507 MOVQ $2, SI // F_SETFD 508 MOVQ $1, DX // FD_CLOEXEC 509 MOVL $(0x2000000+92), AX // fcntl 510 SYSCALL 511 RET