SYS_PROFIL         = 44  // { int sys_profil(caddr_t samples, size_t size, u_long offset, u_int scale); }
	SYS_KTRACE         = 45  // { int sys_ktrace(const char *fname, int ops, int facs, pid_t pid); }
	SYS_SIGACTION      = 46  // { int sys_sigaction(int signum, const struct sigaction *nsa, struct sigaction *osa); }
	SYS_GETGID         = 47  // { gid_t sys_getgid(void); }
	SYS_SIGPROCMASK    = 48  // { int sys_sigprocmask(int how, sigset_t mask); }

	SYS_USTAT                        = 62
	SYS_DUP2                         = 63
	SYS_GETPPID                      = 64
	SYS_GETPGRP                      = 65
	SYS_SETSID                       = 66
	SYS_SIGACTION                    = 67
	SYS_SGETMASK                     = 68
	SYS_SSETMASK                     = 69
	SYS_SETREUID                     = 70
	SYS_SETREGID                     = 71
	SYS_SIGSUSPEND                   = 72

	RET

TEXT runtime·sigaction(SB),NOSPLIT,$0
	MOVW	sig+0(FP), R4		// arg 1 - signum
	MOVV	new+8(FP), R5		// arg 2 - new sigaction
	MOVV	old+16(FP), R6		// arg 3 - old sigaction
	MOVV	$46, R2			// sys_sigaction
	SYSCALL
	BEQ	R7, 3(PC)
	MOVV	$3, R2			// crash on syscall failure
	MOVV	R2, (R2)
	RET

TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$0
	MOVW	how+0(FP), R4		// arg 1 - mode

	MOVW	how+0(FP), A0
	MOV	new+8(FP), A1
	MOV	old+16(FP), A2
	MOVW	size+24(FP), A3
	MOV	$SYS_rt_sigprocmask, A7
	ECALL
	MOV	$-4096, T0
	BLTU	A0, T0, 2(PC)
	WORD	$0	// crash
	RET

// func rt_sigaction(sig uintptr, new, old *sigactiont, size uintptr) int32
TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
	MOV	sig+0(FP), A0
	MOV	new+8(FP), A1
	MOV	old+16(FP), A2
	MOV	size+24(FP), A3
	MOV	$SYS_rt_sigaction, A7

	MOVV	new+8(FP), R5
	MOVV	old+16(FP), R6
	MOVW	size+24(FP), R7
	MOVV	$SYS_rt_sigprocmask, R11
	SYSCALL
	MOVW	$-4096, R5
	BGEU	R5, R4, 2(PC)
	MOVV	R0, 0xf1(R0)	// crash
	RET

// func rt_sigaction(sig uintptr, new, old *sigactiont, size uintptr) int32
TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
	MOVV	sig+0(FP), R4
	MOVV	new+8(FP), R5
	MOVV	old+16(FP), R6
	MOVV	size+24(FP), R7

	SYS_EXTATTR_GET_LINK         = 413 // { ssize_t extattr_get_link( \
	SYS_EXTATTR_DELETE_LINK      = 414 // { int extattr_delete_link( \
	SYS___MAC_EXECVE             = 415 // { int __mac_execve(char *fname, char **argv, \
	SYS_SIGACTION                = 416 // { int sigaction(int sig, \
	SYS_SIGRETURN                = 417 // { int sigreturn( \
	SYS_GETCONTEXT               = 421 // { int getcontext(struct __ucontext *ucp); }

	SYS_EXTATTR_GET_LINK         = 413 // { ssize_t extattr_get_link( \
	SYS_EXTATTR_DELETE_LINK      = 414 // { int extattr_delete_link( \
	SYS___MAC_EXECVE             = 415 // { int __mac_execve(char *fname, char **argv, \
	SYS_SIGACTION                = 416 // { int sigaction(int sig, \
	SYS_SIGRETURN                = 417 // { int sigreturn( \
	SYS_GETCONTEXT               = 421 // { int getcontext(struct __ucontext *ucp); }

	SYS_EXTATTR_GET_LINK         = 413 // { ssize_t extattr_get_link( \
	SYS_EXTATTR_DELETE_LINK      = 414 // { int extattr_delete_link( \
	SYS___MAC_EXECVE             = 415 // { int __mac_execve(char *fname, char **argv, \
	SYS_SIGACTION                = 416 // { int sigaction(int sig, \
	SYS_SIGRETURN                = 417 // { int sigreturn( \
	SYS_GETCONTEXT               = 421 // { int getcontext(struct __ucontext *ucp); }

	SYS_SIGPROCMASK            = 340 // { int sigprocmask(int how, const sigset_t *set, \
	SYS_SIGSUSPEND             = 341 // { int sigsuspend(const sigset_t *sigmask); }
	SYS_SIGACTION              = 342 // { int sigaction(int sig, const struct sigaction *act, \
	SYS_SIGPENDING             = 343 // { int sigpending(sigset_t *set); }
	SYS_SIGRETURN              = 344 // { int sigreturn(ucontext_t *sigcntxp); }

	SYS_SIGPROCMASK            = 340 // { int sigprocmask(int how, const sigset_t *set, sigset_t *oset); }
	SYS_SIGSUSPEND             = 341 // { int sigsuspend(const sigset_t *sigmask); }
	SYS_SIGACTION              = 342 // { int sigaction(int sig, const struct sigaction *act, struct sigaction *oact); }
	SYS_SIGPENDING             = 343 // { int sigpending(sigset_t *set); }