//go:linkname libc_sigaction libc_sigaction
//go:linkname libc_sigaltstack libc_sigaltstack
//go:linkname libc_sigprocmask libc_sigprocmask
//go:linkname libc_sysconf libc_sysconf
//go:linkname libc_usleep libc_usleep
//go:linkname libc_write libc_write
//go:linkname libc_pipe2 libc_pipe2

var (
	libc____errno,
	libc_clock_gettime,
	libc_exit,
	libc_getcontext,
	libc_kill,
	libc_madvise,
	libc_malloc,

//go:linkname libc_setitimer libc_setitimer
//go:linkname libc_sigaction libc_sigaction
//go:linkname libc_sigaltstack libc_sigaltstack
//go:linkname libc_sysconf libc_sysconf
//go:linkname libc_usleep libc_usleep
//go:linkname libc_write libc_write
//go:linkname libc_getuid libc_getuid
//go:linkname libc_geteuid libc_geteuid
//go:linkname libc_getgid libc_getgid
//go:linkname libc_getegid libc_getegid

//go:cgo_import_dynamic libc_pipe2 pipe2 "libc.so"

//go:cgo_import_dynamic libc_clock_gettime clock_gettime "libc.so"
//go:cgo_import_dynamic libc_setitimer setitimer "libc.so"
//go:cgo_import_dynamic libc_usleep usleep "libc.so"
//go:cgo_import_dynamic libc_sysctl sysctl "libc.so"
//go:cgo_import_dynamic libc_fcntl fcntl "libc.so"
//go:cgo_import_dynamic libc_getpid getpid "libc.so"
//go:cgo_import_dynamic libc_kill kill "libc.so"

	MOVQ	0(SP), SP
	RET

noswitch:
	// Not a Go-managed thread. Do not switch stack.
	CALL	AX
	RET

// Runs on OS stack. duration (in µs units) is in DI.
TEXT usleep2<>(SB),NOSPLIT,$0
	LEAQ	libc_usleep(SB), AX
	CALL	AX
	RET

// Runs on OS stack, called from runtime·osyield.
TEXT runtime·osyield1(SB),NOSPLIT,$0
	LEAQ	libc_sched_yield(SB), AX
	CALL	AX

	MOVD	old+16(FP), R5
	MOVD	$libpthread_sigthreadmask(SB), R12
	CSYSCALL()
	RET

// Runs on OS stack, called from runtime·usleep.
TEXT runtime·usleep1(SB),NOSPLIT,$0-4
	MOVW	us+0(FP), R3
	MOVD	$libc_usleep(SB), R12
	CSYSCALL()
	RET

// Runs on OS stack, called from runtime·exit.
TEXT runtime·exit1(SB),NOSPLIT,$0-4
	MOVW	code+0(FP), R3
	MOVD	$libc_exit(SB), R12
	CSYSCALL()
	RET

	MOVD	16(R3), R5		// arg 3 - old
	MOVW	0(R3), R3		// arg 1 - which
	CALL	libc_setitimer(SB)
	RET

TEXT runtime·usleep_trampoline(SB),NOSPLIT,$32
	MOVW	0(R3), R3		// arg 1 - usec
	CALL	libc_usleep(SB)
	RET

TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$32
	MOVW	8(R3), R4		// arg 2 - miblen
	MOVD	16(R3), R5		// arg 3 - out
	MOVD	24(R3), R6		// arg 4 - size
	MOVD	32(R3), R7		// arg 5 - dst

	MOVD	16(R0), R2		// arg 3 - old
	MOVW	0(R0), R0		// arg 1 - which
	CALL	libc_setitimer(SB)
	RET

TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
	MOVD	0(R0), R0		// arg 1 - usec
	CALL	libc_usleep(SB)
	RET

TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$0
	MOVW	8(R0), R1		// arg 2 - miblen
	MOVD	16(R0), R2		// arg 3 - out
	MOVD	24(R0), R3		// arg 4 - size
	MOVD	32(R0), R4		// arg 5 - dst

	MOV	16(X10), X12		// arg 3 - old
	MOVW	0(X10), X10		// arg 1 - which
	CALL	libc_setitimer(SB)
	RET

TEXT runtime·usleep_trampoline(SB),NOSPLIT,$8
	MOVW	0(X10), X10		// arg 1 - usec
	CALL	libc_usleep(SB)
	RET

TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$8
	MOVW	8(X10), X11		// arg 2 - miblen
	MOV	16(X10), X12		// arg 3 - out
	MOV	24(X10), X13		// arg 4 - size
	MOV	32(X10), X14		// arg 5 - dst

//go:cgo_import_dynamic libc_madvise madvise "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_mlock mlock "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_error __error "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_usleep usleep "/usr/lib/libSystem.B.dylib"

//go:cgo_import_dynamic libc_proc_regionfilename proc_regionfilename "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_mach_task_self_ mach_task_self_ "/usr/lib/libSystem.B.dylib""

	MOVQ	16(DI), DX		// arg 3 old
	MOVL	0(DI), DI		// arg 1 which
	CALL	libc_setitimer(SB)
	RET

TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
	MOVL	0(DI), DI		// arg 1 usec
	CALL	libc_usleep(SB)
	RET

TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$0
	MOVL	8(DI), SI		// arg 2 miblen
	MOVQ	16(DI), DX		// arg 3 out
	MOVQ	24(DI), CX		// arg 4 size
	MOVQ	32(DI), R8		// arg 5 dst