SYS_THRKILL        = 119 // { int sys_thrkill(pid_t tid, int signum, void *tcb); }
	SYS_READV          = 120 // { ssize_t sys_readv(int fd, const struct iovec *iovp, int iovcnt); }
	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, const struct iovec *iovp, int iovcnt); }
	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }

	SYS_PROFIL         = 44  // { int sys_profil(caddr_t samples, size_t size, \
	SYS_KTRACE         = 45  // { int sys_ktrace(const char *fname, int ops, \
	SYS_SIGACTION      = 46  // { int sys_sigaction(int signum, \
	SYS_GETGID         = 47  // { gid_t sys_getgid(void); }
	SYS_SIGPROCMASK    = 48  // { int sys_sigprocmask(int how, sigset_t mask); }
	SYS_GETLOGIN       = 49  // { int sys_getlogin(char *namebuf, u_int namelen); }

	SYS_FCHFLAGS                 = 35  // { int fchflags(int fd, u_long flags); }
	SYS_SYNC                     = 36  // { int sync(void); }
	SYS_KILL                     = 37  // { int kill(int pid, int signum); }
	SYS_GETPPID                  = 39  // { pid_t getppid(void); }
	SYS_DUP                      = 41  // { int dup(u_int fd); }
	SYS_PIPE                     = 42  // { int pipe(void); }

		elfobj.flags = hdr.Flags
		elfobj.ehsize = uint32(hdr.Ehsize)
		elfobj.phentsize = uint32(hdr.Phentsize)
		elfobj.phnum = uint32(hdr.Phnum)
		elfobj.shentsize = uint32(hdr.Shentsize)
		elfobj.shnum = uint32(hdr.Shnum)
		elfobj.shstrndx = uint32(hdr.Shstrndx)
	} else {
		elfobj.type_ = uint32(hdr.Type)
		elfobj.machine = uint32(hdr.Machine)
		elfobj.version = hdr.Version
		elfobj.entry = uint64(hdr.Entry)

	MOVL	pid+0(FP), DI	// arg 1 - pid
	MOVL	tid+4(FP), SI	// arg 2 - tid
	MOVQ	sig+8(FP), DX	// arg 3 - signum
	MOVL	$497, AX	// lwp_kill
	SYSCALL
	RET

TEXT runtime·raiseproc(SB),NOSPLIT,$0
	MOVL	$20, AX		// getpid
	SYSCALL
	MOVQ	AX, DI		// arg 1 - pid
	MOVL	sig+0(FP), SI	// arg 2 - signum
	MOVL	$37, AX		// kill
	SYSCALL
	RET

TEXT runtime·setitimer(SB), NOSPLIT, $-8
	MOVL	mode+0(FP), DI

	SYS_PROFIL         = 44  // { int sys_profil(caddr_t samples, size_t size, \
	SYS_KTRACE         = 45  // { int sys_ktrace(const char *fname, int ops, \
	SYS_SIGACTION      = 46  // { int sys_sigaction(int signum, \
	SYS_GETGID         = 47  // { gid_t sys_getgid(void); }
	SYS_SIGPROCMASK    = 48  // { int sys_sigprocmask(int how, sigset_t mask); }
	SYS_GETLOGIN       = 49  // { int sys_getlogin(char *namebuf, u_int namelen); }

	SYS_PROFIL         = 44  // { int sys_profil(caddr_t samples, size_t size, \
	SYS_KTRACE         = 45  // { int sys_ktrace(const char *fname, int ops, \
	SYS_SIGACTION      = 46  // { int sys_sigaction(int signum, \
	SYS_GETGID         = 47  // { gid_t sys_getgid(void); }
	SYS_SIGPROCMASK    = 48  // { int sys_sigprocmask(int how, sigset_t mask); }
	SYS_GETLOGIN       = 49  // { int sys_getlogin(char *namebuf, u_int namelen); }

	SWI $SYS_setcontext
	// something failed, we have to exit
	MOVW $0x4242, R0 // magic return number
	SWI $SYS_exit
	B -2(PC)	// continue exit

TEXT runtime·sigaction(SB),NOSPLIT,$4
	MOVW sig+0(FP), R0	// arg 1 - signum
	MOVW new+4(FP), R1	// arg 2 - nsa
	MOVW old+8(FP), R2	// arg 3 - osa
	MOVW $sigreturn_tramp<>(SB), R3	// arg 4 - tramp
	MOVW $2, R4	// arg 5 - vers
	MOVW R4, 4(R13)
	ADD $4, R13	// pass arg 5 on stack

     * deal with the cases where rounding towards 0 is wrong, which typically depends on the sign of
     * p / q.
     *
     * signum is 1 if p and q are both nonnegative or both negative, and -1 otherwise.
     */
    int signum = 1 | (int) ((p ^ q) >> (Long.SIZE - 1));
    boolean increment;
    switch (mode) {
      case UNNECESSARY:
        checkRoundingUnnecessary(rem == 0);

     * deal with the cases where rounding towards 0 is wrong, which typically depends on the sign of
     * p / q.
     *
     * signum is 1 if p and q are both nonnegative or both negative, and -1 otherwise.
     */
    int signum = 1 | (int) ((p ^ q) >> (Long.SIZE - 1));
    boolean increment;
    switch (mode) {
      case UNNECESSARY:
        checkRoundingUnnecessary(rem == 0);