CALL	(R18)

	// fn should never return.
	MOVV	$2, R8			// crash if reached
	MOVV	R8, (R8)
	RET

TEXT runtime·sigaltstack(SB),NOSPLIT,$0
	MOVV	new+0(FP), R4		// arg 1 - new sigaltstack
	MOVV	old+8(FP), R5		// arg 2 - old sigaltstack
	MOVV	$288, R2		// sys_sigaltstack
	SYSCALL
	BEQ	R7, 3(PC)
	MOVV	$0, R8			// crash on syscall failure
	MOVV	R8, (R8)
	RET

TEXT runtime·osyield(SB),NOSPLIT,$0

package runtime

import (
	"internal/abi"
	"internal/goarch"
	"unsafe"
)

type mOS struct{}

//go:noescape
func thr_new(param *thrparam, size int32) int32

//go:noescape
func sigaltstack(new, old *stackt)

//go:noescape
func sigprocmask(how int32, new, old *sigset)

//go:noescape
func setitimer(mode int32, new, old *itimerval)

//go:noescape

	SYS_CLOSEFROM      = 287 // { int sys_closefrom(int fd); }
	SYS_SIGALTSTACK    = 288 // { int sys_sigaltstack(const struct sigaltstack *nss, struct sigaltstack *oss); }
	SYS_SHMGET         = 289 // { int sys_shmget(key_t key, size_t size, int shmflg); }
	SYS_SEMOP          = 290 // { int sys_semop(int semid, struct sembuf *sops, size_t nsops); }

//go:cgo_import_dynamic libc_sem_wait sem_wait "libc.so"
//go:cgo_import_dynamic libc_setitimer setitimer "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_sigprocmask sigprocmask "libc.so"
//go:cgo_import_dynamic libc_sysconf sysconf "libc.so"
//go:cgo_import_dynamic libc_usleep usleep "libc.so"

	SYS_CLOSEFROM      = 287 // { int sys_closefrom(int fd); }
	SYS_SIGALTSTACK    = 288 // { int sys_sigaltstack(const struct sigaltstack *nss, struct sigaltstack *oss); }
	SYS_SHMGET         = 289 // { int sys_shmget(key_t key, size_t size, int shmflg); }
	SYS_SEMOP          = 290 // { int sys_semop(int semid, struct sembuf *sops, size_t nsops); }

	SYS_CLOSEFROM      = 287 // { int sys_closefrom(int fd); }
	SYS_SIGALTSTACK    = 288 // { int sys_sigaltstack(const struct sigaltstack *nss, struct sigaltstack *oss); }
	SYS_SHMGET         = 289 // { int sys_shmget(key_t key, size_t size, int shmflg); }
	SYS_SEMOP          = 290 // { int sys_semop(int semid, struct sembuf *sops, size_t nsops); }

	SYS_CLOSEFROM      = 287 // { int sys_closefrom(int fd); }
	SYS_SIGALTSTACK    = 288 // { int sys_sigaltstack(const struct sigaltstack *nss, struct sigaltstack *oss); }
	SYS_SHMGET         = 289 // { int sys_shmget(key_t key, size_t size, int shmflg); }
	SYS_SEMOP          = 290 // { int sys_semop(int semid, struct sembuf *sops, size_t nsops); }

	_SI_USER     = 0
	_SS_DISABLE  = 4
	_SIG_BLOCK   = 1
	_SIG_UNBLOCK = 2
	_SIG_SETMASK = 3
)

type mOS struct{}

//go:noescape
func lwp_create(param *lwpparams) int32

//go:noescape
func sigaltstack(new, old *stackt)

//go:noescape
func sigaction(sig uint32, new, old *sigactiont)

//go:noescape
func sigprocmask(how int32, new, old *sigset)

//go:noescape
func setitimer(mode int32, new, old *itimerval)

	SYS_CLOSEFROM      = 287 // { int sys_closefrom(int fd); }
	SYS_SIGALTSTACK    = 288 // { int sys_sigaltstack(const struct sigaltstack *nss, struct sigaltstack *oss); }
	SYS_SHMGET         = 289 // { int sys_shmget(key_t key, size_t size, int shmflg); }
	SYS_SEMOP          = 290 // { int sys_semop(int semid, struct sembuf *sops, size_t nsops); }

	SYS_CLOSEFROM      = 287 // { int sys_closefrom(int fd); }
	SYS_SIGALTSTACK    = 288 // { int sys_sigaltstack(const struct sigaltstack *nss, struct sigaltstack *oss); }
	SYS_SHMGET         = 289 // { int sys_shmget(key_t key, size_t size, int shmflg); }
	SYS_SEMOP          = 290 // { int sys_semop(int semid, struct sembuf *sops, size_t nsops); }