MOVW.CS $-1, R0
	MOVW	R0, ret+12(FP)
	RET

TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
	MOVW new+0(FP), R0
	MOVW old+4(FP), R1
	MOVW $SYS_sigaltstack, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
	MOVW	sig+4(FP), R0
	MOVW	info+8(FP), R1
	MOVW	ctx+12(FP), R2
	MOVW	fn+0(FP), R11
	MOVW	R13, R4
	SUB	$24, R13

	MOVW	8(R0), R2		// arg 3 prot
	MOVW	12(R0), R3		// arg 4 flags
	MOVW	16(R0), R4		// arg 5 fid (on stack)
	MOVW	R4, 0(R13)
	MOVW	$0, R5			// pad (on stack)
	MOVW	R5, 4(R13)
	MOVW	20(R0), R6		// arg 6 offset (on stack)
	MOVW	R6, 8(R13)		// low 32 bits
	MOVW    $0, R7
	MOVW	R7, 12(R13)		// high 32 bits
	MOVW	0(R0), R0		// arg 1 addr
	BL	libc_mmap(SB)
	MOVW	$0, R1
	CMP	$-1, R0
	BNE	ok

	MOVW	$AT_FDCWD, R4 // AT_FDCWD, so this acts like open
	MOVV	name+0(FP), R5
	MOVW	mode+8(FP), R6
	MOVW	perm+12(FP), R7
	MOVV	$SYS_openat, R2
	SYSCALL
	BEQ	R7, 2(PC)
	MOVW	$-1, R2
	MOVW	R2, ret+16(FP)
	RET

TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
	MOVW	fd+0(FP), R4
	MOVV	$SYS_close, R2
	SYSCALL
	BEQ	R7, 2(PC)
	MOVW	$-1, R2
	MOVW	R2, ret+8(FP)
	RET

TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
	MOVW	$AT_FDCWD, R4 // AT_FDCWD, so this acts like open
	MOVV	name+0(FP), R5
	MOVW	mode+8(FP), R6
	MOVW	perm+12(FP), R7
	MOVV	$SYS_openat, R11
	SYSCALL
	MOVW	$-4096, R5
	BGEU	R5, R4, 2(PC)
	MOVW	$-1, R4
	MOVW	R4, ret+16(FP)
	RET

// func closefd(fd int32) int32
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
	MOVW	fd+0(FP), R4
	MOVV	$SYS_close, R11
	SYSCALL

TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
	MOVW	$SYS_getpid, R1
	SYSCALL
	MOVW	R2, R10
	MOVW	$SYS_gettid, R1
	SYSCALL
	MOVW	R2, R3	// arg 2 tid
	MOVW	R10, R2	// arg 1 pid
	MOVW	sig+0(FP), R4	// arg 2
	MOVW	$SYS_tgkill, R1
	SYSCALL
	RET

TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
	MOVW	$SYS_getpid, R1
	SYSCALL
	MOVW	R2, R2	// arg 1 pid
	MOVW	sig+0(FP), R3	// arg 2
	MOVW	$SYS_kill, R1

	MOVD	0(R14), R3		// arg 1 - addr
	MOVD	8(R14), R4		// arg 2 - len
	MOVW	16(R14), R5		// arg 3 - prot
	MOVW	20(R14), R6		// arg 4 - flags
	MOVW	24(R14), R7		// arg 5 - fid
	MOVW	28(R14), R8		// arg 6 - offset
	CALL	libc_mmap(SB)
	MOVD	$0, R4
	CMP	R3, $-1
	BNE	noerr
	CALL	libc_errno(SB)
	MOVW	(R3), R4		// errno
	MOVD	$0, R3
noerr:
	MOVD	R3, 32(R14)
	MOVD	R4, 40(R14)
	RET

	MOVD	name+0(FP), R3
	MOVW	mode+8(FP), R4
	MOVW	perm+12(FP), R5
	SYSCALL	$SYS_open
	BVC	2(PC)
	MOVW	$-1, R3
	MOVW	R3, ret+16(FP)
	RET

TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
	MOVW	fd+0(FP), R3
	SYSCALL	$SYS_close
	BVC	2(PC)
	MOVW	$-1, R3
	MOVW	R3, ret+8(FP)
	RET

TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28
	MOVD	fd+0(FP), R3
	MOVD	p+8(FP), R4
	MOVW	n+16(FP), R5
	SYSCALL	$SYS_write
	BVC	2(PC)

	MOV	0(X9), X10		// arg 1 - addr
	MOV	8(X9), X11		// arg 2 - len
	MOVW	16(X9), X12		// arg 3 - prot
	MOVW	20(X9), X13		// arg 4 - flags
	MOVW	24(X9), X14		// arg 5 - fid
	MOVW	28(X9), X15		// arg 6 - offset
	CALL	libc_mmap(SB)
	MOV	$0, X5
	MOV	$-1, X6
	BNE	X6, X10, noerr
	CALL	libc_errno(SB)
	MOVW	(X10), X5		// errno
	MOV	$0, X10
noerr:
	MOV	X10, 32(X9)
	MOV	X5, 40(X9)
	RET

	MOVW	off+20(FP), R5
	MOVW	$SYS_mmap2, R7
	SWI	$0
	MOVW	$0xfffff001, R6
	CMP		R6, R0
	MOVW	$0, R1
	RSB.HI	$0, R0
	MOVW.HI	R0, R1		// if error, put in R1
	MOVW.HI	$0, R0
	MOVW	R0, p+24(FP)
	MOVW	R1, err+28(FP)
	RET

TEXT runtime·munmap(SB),NOSPLIT,$0
	MOVW	addr+0(FP), R0
	MOVW	n+4(FP), R1
	MOVW	$SYS_munmap, R7
	SWI	$0
	MOVW	$0xfffff001, R6
	CMP 	R6, R0

	MOVW	$0, R1
	MOVW.CS R0, R1	// if error, move to R1
	MOVW.CS $0, R0
	MOVW	R0, p+24(FP)
	MOVW	R1, err+28(FP)
	RET

TEXT runtime·munmap(SB),NOSPLIT,$0
	MOVW addr+0(FP), R0	// arg 1 - addr
	MOVW n+4(FP), R1	// arg 2 - len
	SWI $SYS_munmap
	MOVW.CS $0, R8	// crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·madvise(SB),NOSPLIT,$0
	MOVW	addr+0(FP), R0	// arg 1 - addr