//go:linkname libc_sem_post libc_sem_post
//go:linkname libc_sem_reltimedwait_np libc_sem_reltimedwait_np
//go:linkname libc_sem_wait libc_sem_wait
//go:linkname libc_setitimer libc_setitimer
//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_sem_post libc_sem_post
//go:linkname libc_sem_timedwait libc_sem_timedwait
//go:linkname libc_sem_wait libc_sem_wait
//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:cgo_import_dynamic libc_kill kill "libc.so"
//go:cgo_import_dynamic libc_kqueue kqueue "libc.so"
//go:cgo_import_dynamic libc_kevent kevent "libc.so"

//go:cgo_import_dynamic libc_sigaction sigaction "libc.so"
//go:cgo_import_dynamic libc_sigaltstack sigaltstack "libc.so"

//go:cgo_import_dynamic libc_issetugid issetugid "libc.so"

	MOVW	R3, ret+32(FP)
	RET

// Runs on OS stack, called from runtime·sigaction.
TEXT runtime·sigaction1(SB),NOSPLIT,$0-24
	MOVD	sig+0(FP), R3
	MOVD	new+8(FP), R4
	MOVD	old+16(FP), R5
	MOVD	$libc_sigaction(SB), R12
	CSYSCALL()

noerr:
	MOVW	R0, 12(R19)
	MOVW	R1, 16(R19)
	RET

TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$0
	MOVD	8(R0), R1		// arg 2 - new
	MOVD	16(R0), R2		// arg 3 - old
	MOVW	0(R0), R0		// arg 1 - sig
	CALL	libc_sigaction(SB)
	CMP	$-1, R0
	BNE	3(PC)
	MOVD	$0, R0			// crash on syscall failure
	MOVD	R0, (R0)
	RET

TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0
	MOVD	8(R0), R1		// arg 2 - new

noerr:
	MOVW	R3, 12(R14)
	MOVW	R4, 16(R14)
	RET

TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$32
	MOVD	8(R3), R4		// arg 2 - new
	MOVD	16(R3), R5		// arg 3 - old
	MOVW	0(R3), R3		// arg 1 - sig
	CALL	libc_sigaction(SB)
	CMP	R3, $-1
	BNE	3(PC)
	MOVD	$0, R3			// crash on syscall failure
	MOVD	R3, (R3)
	RET

TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$32
	MOVD	8(R3), R4		// arg 2 - new

	MOVW	X10, 12(X9)
	MOVW	X11, 16(X9)
	RET

TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$8
	MOV	8(X10), X11		// arg 2 - new
	MOV	16(X10), X12		// arg 3 - old
	MOVW	0(X10), X10		// arg 1 - sig
	CALL	libc_sigaction(SB)
	MOV	$-1, X5
	BNE	X5, X10, 3(PC)
	MOV	$0, X5			// crash on failure
	MOV	X5, (X5)
	RET

TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$8
	MOV	8(X10), X11		// arg 2 - new

	JMP	AX

// For cgo unwinding to work, this function must look precisely like
// the one in glibc. The glibc source code is:
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c;h=afdce87381228f0cf32fa9fa6c8c4efa5179065c#l80
// The code that cares about the precise instructions used is:

//go:cgo_import_dynamic libc_mach_absolute_time mach_absolute_time "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_clock_gettime clock_gettime "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_sigaction sigaction "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_pthread_sigmask pthread_sigmask "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_sigaltstack sigaltstack "/usr/lib/libSystem.B.dylib"

noerr:
	MOVL	AX, 12(BX)
	MOVL	DX, 16(BX)
	RET

TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$0
	MOVQ	8(DI), SI		// arg 2 new
	MOVQ	16(DI), DX		// arg 3 old
	MOVL	0(DI), DI		// arg 1 sig
	CALL	libc_sigaction(SB)
	TESTL	AX, AX
	JEQ	2(PC)
	MOVL	$0xf1, 0xf1  // crash
	RET

TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0
	MOVQ	8(DI), SI	// arg 2 new
	MOVQ	16(DI), DX	// arg 3 old