sys_darwin_arm64.s 9.96 KB
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 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// System calls and other sys.stuff for ARM64, Darwin
// See http://fxr.watson.org/fxr/source/bsd/kern/syscalls.c?v=xnu-1228
// or /usr/include/sys/syscall.h (on a Mac) for system call numbers.

#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"

// Copied from /usr/include/sys/syscall.h
#define	SYS_exit           1
#define	SYS_read           3
#define	SYS_write          4
#define	SYS_open           5
#define	SYS_close          6
#define	SYS_mmap           197
#define	SYS_munmap         73
#define	SYS_madvise        75
#define	SYS_mincore        78
#define	SYS_gettimeofday   116
#define	SYS_kill           37
#define	SYS_getpid         20
#define	SYS___pthread_kill 328
#define	SYS_setitimer      83
#define	SYS___sysctl       202
#define	SYS_sigprocmask    48
#define	SYS_sigaction      46
#define	SYS_sigreturn      184
#define	SYS_select         93
#define	SYS_bsdthread_register 366
#define	SYS_bsdthread_create 360
#define	SYS_bsdthread_terminate 361
#define	SYS_kqueue         362
#define	SYS_kevent         363
#define	SYS_fcntl          92

TEXT notok<>(SB),NOSPLIT,$0
	MOVD	$0, R8
	MOVD	R8, (R8)
	B	0(PC)

TEXT runtime·open(SB),NOSPLIT,$0
	MOVD	name+0(FP), R0
	MOVW	mode+8(FP), R1
	MOVW	perm+12(FP), R2
	MOVD	$SYS_open, R16
	SVC	$0x80
	CSINV	LO, R0, ZR, R0
	MOVW	R0, ret+16(FP)
	RET

TEXT runtime·closefd(SB),NOSPLIT,$0
	MOVW	fd+0(FP), R0
	MOVW	$SYS_close, R16
	SVC	$0x80
	CSINV	LO, R0, ZR, R0
	MOVW	R0, ret+8(FP)
	RET

TEXT runtime·write(SB),NOSPLIT,$0
	MOVW	fd+0(FP), R0
	MOVD	p+8(FP), R1
	MOVW	n+16(FP), R2
	MOVW	$SYS_write, R16
	SVC	$0x80
	CSINV	LO, R0, ZR, R0
	MOVW	R0, ret+24(FP)
	RET

TEXT runtime·read(SB),NOSPLIT,$0
	MOVW	fd+0(FP), R0
	MOVD	p+8(FP), R1
	MOVW	n+16(FP), R2
	MOVW	$SYS_read, R16
	SVC	$0x80
	CSINV	LO, R0, ZR, R0
	MOVW	R0, ret+24(FP)
	RET

TEXT runtime·exit(SB),NOSPLIT,$-8
	MOVW	code+0(FP), R0
	MOVW	$SYS_exit, R16
	SVC	$0x80
	MOVD	$1234, R0
	MOVD	$1002, R1
	MOVD	R0, (R1)	// fail hard

// Exit this OS thread (like pthread_exit, which eventually
// calls __bsdthread_terminate).
TEXT runtime·exit1(SB),NOSPLIT,$0
	MOVW	$SYS_bsdthread_terminate, R16
	SVC	$0x80
	MOVD	$1234, R0
	MOVD	$1003, R1
	MOVD	R0, (R1)	// fail hard

TEXT runtime·raise(SB),NOSPLIT,$0
	MOVW	$SYS_getpid, R16
	SVC	$0x80
	// arg 1 pid already in R0 from getpid
	MOVW	sig+0(FP), R1	// arg 2 - signal
	MOVW	$1, R2	// arg 3 - posix
	MOVW	$SYS_kill, R16
	SVC	$0x80
	RET

TEXT runtime·mmap(SB),NOSPLIT,$0
	MOVD	addr+0(FP), R0
	MOVD	n+8(FP), R1
	MOVW	prot+16(FP), R2
	MOVW	flags+20(FP), R3
	MOVW	fd+24(FP), R4
	MOVW	off+28(FP), R5
	MOVW	$SYS_mmap, R16
	SVC	$0x80
	MOVD	R0, ret+32(FP)
	RET

TEXT runtime·munmap(SB),NOSPLIT,$0
	MOVD	addr+0(FP), R0
	MOVD	n+8(FP), R1
	MOVW	$SYS_munmap, R16
	SVC	$0x80
	BCC	2(PC)
	BL	notok<>(SB)
	RET

TEXT runtime·madvise(SB),NOSPLIT,$0
	MOVD	addr+0(FP), R0
	MOVD	n+8(FP), R1
	MOVW	flags+16(FP), R2
	MOVW	$SYS_madvise, R16
	SVC	$0x80
	BCC	2(PC)
	BL	notok<>(SB)
	RET

TEXT runtime·setitimer(SB),NOSPLIT,$0
	MOVW	mode+0(FP), R0
	MOVD	new+8(FP), R1
	MOVD	old+16(FP), R2
	MOVW	$SYS_setitimer, R16
	SVC	$0x80
	RET

TEXT time·now(SB),NOSPLIT,$32-12
	MOVD	RSP, R0	// timeval
	MOVD	R0, R9	// this is how dyld calls gettimeofday
	MOVW	$0, R1	// zone
	MOVW	$SYS_gettimeofday, R16
	SVC	$0x80	// Note: x0 is tv_sec, w1 is tv_usec

	MOVD	R0, sec+0(FP)
	MOVW	$1000, R3
	MUL	R3, R1
	MOVW	R1, nsec+8(FP)
	RET

TEXT runtime·nanotime(SB),NOSPLIT,$32
	MOVD	RSP, R0	// timeval
	MOVD	R0, R9	// this is how dyld calls gettimeofday
	MOVW	$0, R1	// zone
	MOVW	$SYS_gettimeofday, R16
	SVC	$0x80	// Note: x0 is tv_sec, w1 is tv_usec

	MOVW	$1000000000, R3
	MUL	R3, R0
	MOVW	$1000, R3
	MUL	R3, R1
	ADD	R1, R0

	MOVD	R0, ret+0(FP)
	RET

// Sigtramp's job is to call the actual signal handler.
// It is called with the following arguments on the stack:
//	LR	"return address" - ignored
//	R0	actual handler
//	R1	siginfo style - ignored
//	R2	signal number
//	R3	siginfo
//	R4	context
TEXT runtime·sigtramp(SB),NOSPLIT,$0
	// this might be called in external code context,
	// where g is not set.
	// first save R0, because runtime·load_g will clobber it
	MOVD.W	R0, -16(RSP)	// note: stack must be 16-byte aligned
	MOVB	runtime·iscgo(SB), R0
	CMP	$0, R0
	BEQ	2(PC)
	BL	runtime·load_g(SB)

	CMP	$0, g
	BNE	cont
	// fake function call stack frame for badsignal
	// we only need to pass R2 (signal number), but
	// badsignal will expect R2 at 8(RSP), so we also
	// push R1 onto stack. turns out we do need R1
	// to do sigreturn.
	MOVD.W	R1, -16(RSP)
	MOVD	R2, 8(RSP)
	MOVD	R4, 24(RSP)	// save ucontext, badsignal might clobber R4
	MOVD	$runtime·badsignal(SB), R26
	BL	(R26)
	MOVD	0(RSP), R1	// saved infostype
	MOVD	24(RSP), R0	// the ucontext
	ADD	$(16+16), RSP
	B	ret

cont:
	// Restore R0
	MOVD.P	16(RSP), R0

	// NOTE: some Darwin/ARM kernels always use the main stack to run the
	// signal handler. We need to switch to gsignal ourselves.
	MOVD	g_m(g), R11
	MOVD	m_gsignal(R11), R5
	MOVD	(g_stack+stack_hi)(R5), R6
	SUB	$64, R6

	// copy arguments for call to sighandler
	MOVD	R2, 8(R6)	// signal num
	MOVD	R3, 16(R6)	// signal info
	MOVD	R4, 24(R6)	// context
	MOVD	g, 32(R6)	// old_g

	// Backup ucontext and infostyle
	MOVD	R4, 40(R6)
	MOVD	R1, 48(R6)

	// switch stack and g
	MOVD	R6, RSP	// sigtramp can not re-entrant, so no need to back up RSP.
	MOVD	R5, g

	BL	(R0)

	// call sigreturn
	MOVD	40(RSP), R0	// saved ucontext
	MOVD	48(RSP), R1	// saved infostyle
ret:
	MOVW	$SYS_sigreturn, R16 // sigreturn(ucontext, infostyle)
	SVC	$0x80

	// if sigreturn fails, we can do nothing but exit
	B	runtime·exit(SB)

TEXT runtime·sigprocmask(SB),NOSPLIT,$0
	MOVW	sig+0(FP), R0
	MOVD	new+8(FP), R1
	MOVD	old+16(FP), R2
	MOVW	$SYS_sigprocmask, R16
	SVC	$0x80
	BCC	2(PC)
	BL	notok<>(SB)
	RET

TEXT runtime·sigaction(SB),NOSPLIT,$0
	MOVW	mode+0(FP), R0
	MOVD	new+8(FP), R1
	MOVD	old+16(FP), R2
	MOVW	$SYS_sigaction, R16
	SVC	$0x80
	BCC	2(PC)
	BL	notok<>(SB)
	RET

TEXT runtime·usleep(SB),NOSPLIT,$12
	MOVW	usec+0(FP), R0
	MOVW	R0, R1
	MOVW	$1000000, R2
	UDIV	R2, R0
	MUL	R0, R2
	SUB	R2, R1
	MOVD	R0, 0(RSP)
	MOVW	R1, 8(RSP)

	// select(0, 0, 0, 0, &tv)
	MOVW	$0, R0
	MOVW	$0, R1
	MOVW	$0, R2
	MOVW	$0, R3
	MOVD	RSP, R4
	MOVW	$SYS_select, R16
	SVC	$0x80
	RET

TEXT runtime·sysctl(SB),NOSPLIT,$0
	MOVD	mib+0(FP), R0
	MOVW	miblen+8(FP), R1
	MOVD	out+16(FP), R2
	MOVD	size+24(FP), R3
	MOVD	dst+32(FP), R4
	MOVD	ndst+40(FP), R5
	MOVW	$SYS___sysctl, R16
	SVC	$0x80
	BCC	ok
	NEG	R0, R0
	MOVW	R0, ret+48(FP)
	RET
ok:
	MOVW	$0, R0
	MOVW	R0, ret+48(FP)
	RET

// Thread related functions
// Note: On darwin/arm64, it is no longer possible to use bsdthread_register
// as the libc is always linked in. The runtime must use runtime/cgo to
// create threads, so all thread related functions will just exit with a
// unique status.
// void bsdthread_create(void *stk, M *m, G *g, void (*fn)(void))
TEXT runtime·bsdthread_create(SB),NOSPLIT,$0
	MOVD	$44, R0
	MOVW	$SYS_exit, R16
	SVC	$0x80
	RET

// The thread that bsdthread_create creates starts executing here,
// because we registered this function using bsdthread_register
// at startup.
//	R0 = "pthread"
//	R1 = mach thread port
//	R2 = "func" (= fn)
//	R3 = "arg" (= m)
//	R4 = stack
//	R5 = flags (= 0)
TEXT runtime·bsdthread_start(SB),NOSPLIT,$0
	MOVD	$45, R0
	MOVW	$SYS_exit, R16
	SVC	$0x80
	RET

// int32 bsdthread_register(void)
// registers callbacks for threadstart (see bsdthread_create above
// and wqthread and pthsize (not used).  returns 0 on success.
TEXT runtime·bsdthread_register(SB),NOSPLIT,$0
	MOVD	$46, R0
	MOVW	$SYS_exit, R16
	SVC	$0x80
	RET

// uint32 mach_msg_trap(void*, uint32, uint32, uint32, uint32, uint32, uint32)
TEXT runtime·mach_msg_trap(SB),NOSPLIT,$0
	MOVD	h+0(FP), R0
	MOVW	op+8(FP), R1
	MOVW	send_size+12(FP), R2
	MOVW	rcv_size+16(FP), R3
	MOVW	rcv_name+20(FP), R4
	MOVW	timeout+24(FP), R5
	MOVW	notify+28(FP), R6
	MOVN	$30, R16
	SVC	$0x80
	MOVW	R0, ret+32(FP)
	RET

TEXT runtime·mach_task_self(SB),NOSPLIT,$0
	MOVN	$27, R16 // task_self_trap
	SVC	$0x80
	MOVW	R0, ret+0(FP)
	RET

TEXT runtime·mach_thread_self(SB),NOSPLIT,$0
	MOVN	$26, R16 // thread_self_trap
	SVC	$0x80
	MOVW	R0, ret+0(FP)
	RET

TEXT runtime·mach_reply_port(SB),NOSPLIT,$0
	MOVN	$25, R16	// mach_reply_port
	SVC	$0x80
	MOVW	R0, ret+0(FP)
	RET

// Mach provides trap versions of the semaphore ops,
// instead of requiring the use of RPC.

// uint32 mach_semaphore_wait(uint32)
TEXT runtime·mach_semaphore_wait(SB),NOSPLIT,$0
	MOVW	sema+0(FP), R0
	MOVN	$35, R16	// semaphore_wait_trap
	SVC	$0x80
	MOVW	R0, ret+8(FP)
	RET

// uint32 mach_semaphore_timedwait(uint32, uint32, uint32)
TEXT runtime·mach_semaphore_timedwait(SB),NOSPLIT,$0
	MOVW	sema+0(FP), R0
	MOVW	sec+4(FP), R1
	MOVW	nsec+8(FP), R2
	MOVN	$37, R16	// semaphore_timedwait_trap
	SVC	$0x80
	MOVW	R0, ret+16(FP)
	RET

// uint32 mach_semaphore_signal(uint32)
TEXT runtime·mach_semaphore_signal(SB),NOSPLIT,$0
	MOVW	sema+0(FP), R0
	MOVN	$32, R16	// semaphore_signal_trap
	SVC	$0x80
	MOVW	R0, ret+8(FP)
	RET

// uint32 mach_semaphore_signal_all(uint32)
TEXT runtime·mach_semaphore_signal_all(SB),NOSPLIT,$0
	MOVW	sema+0(FP), R0
	MOVN	$33, R16	// semaphore_signal_all_trap
	SVC	$0x80
	MOVW	R0, ret+8(FP)
	RET

// int32 runtime·kqueue(void)
TEXT runtime·kqueue(SB),NOSPLIT,$0
	MOVW	$SYS_kqueue, R16
	SVC	$0x80
	BCC	2(PC)
	NEG	R0, R0
	MOVW	R0, ret+0(FP)
	RET

// int32 runtime·kevent(int kq, Kevent *ch, int nch, Kevent *ev, int nev, Timespec *ts)
TEXT runtime·kevent(SB),NOSPLIT,$0
	MOVW	kq+0(FP), R0
	MOVD	ch+8(FP), R1
	MOVW	nch+16(FP), R2
	MOVD	ev+24(FP), R3
	MOVW	nev+32(FP), R4
	MOVD	ts+40(FP), R5
	MOVW	$SYS_kevent, R16
	SVC	$0x80
	BCC	2(PC)
	NEG	R0, R0
	MOVW	R0, ret+48(FP)
	RET

// int32 runtime·closeonexec(int32 fd)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
	MOVW	fd+0(FP), R0
	MOVW	$2, R1	// F_SETFD
	MOVW	$1, R2	// FD_CLOEXEC
	MOVW	$SYS_fcntl, R16
	SVC	$0x80
	RET

// sigaltstack on some darwin/arm version is buggy and will always
// run the signal handler on the main stack, so our sigtramp has
// to do the stack switch ourselves.
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
	RET