// System call support for RISCV64 BSD

// Just jump to package syscall's implementation for all these functions.
// The runtime may know about them.

TEXT	·Syscall(SB),NOSPLIT,$0-56
	JMP	syscall·Syscall(SB)

TEXT	·Syscall6(SB),NOSPLIT,$0-80
	JMP	syscall·Syscall6(SB)

TEXT	·Syscall9(SB),NOSPLIT,$0-104
	JMP	syscall·Syscall9(SB)

TEXT	·RawSyscall(SB),NOSPLIT,$0-56
	JMP	syscall·RawSyscall(SB)

TEXT	·RawSyscall6(SB),NOSPLIT,$0-80

// System calls for arm, Linux
//

// Just jump to package syscall's implementation for all these functions.
// The runtime may know about them.

TEXT ·Syscall(SB),NOSPLIT,$0-28
	B	syscall·Syscall(SB)

TEXT ·Syscall6(SB),NOSPLIT,$0-40
	B	syscall·Syscall6(SB)

TEXT ·SyscallNoError(SB),NOSPLIT,$0-24
	BL	runtime·entersyscall(SB)
	MOVW	trap+0(FP), R7
	MOVW	a1+4(FP), R0
	MOVW	a2+8(FP), R1
	MOVW	a3+12(FP), R2
	MOVW	$0, R3

// System calls for s390x, Linux
//

// Just jump to package syscall's implementation for all these functions.
// The runtime may know about them.

TEXT ·Syscall(SB),NOSPLIT,$0-56
	BR	syscall·Syscall(SB)

TEXT ·Syscall6(SB),NOSPLIT,$0-80
	BR	syscall·Syscall6(SB)

TEXT ·SyscallNoError(SB),NOSPLIT,$0-48
	BL	runtime·entersyscall(SB)
	MOVD	a1+8(FP), R2
	MOVD	a2+16(FP), R3
	MOVD	a3+24(FP), R4
	MOVD	$0, R5
	MOVD	$0, R6

// System calls for mips, Linux
//

// Just jump to package syscall's implementation for all these functions.
// The runtime may know about them.

TEXT ·Syscall(SB),NOSPLIT,$0-28
	JMP syscall·Syscall(SB)

TEXT ·Syscall6(SB),NOSPLIT,$0-40
	JMP syscall·Syscall6(SB)

TEXT ·Syscall9(SB),NOSPLIT,$0-52
	JMP syscall·Syscall9(SB)

TEXT ·SyscallNoError(SB),NOSPLIT,$0-24
	JAL	runtime·entersyscall(SB)
	MOVW	a1+4(FP), R4

//

// Just jump to package syscall's implementation for all these functions.
// The runtime may know about them.

TEXT ·Syscall(SB),NOSPLIT,$0-56
	JMP	syscall·Syscall(SB)

TEXT ·Syscall6(SB),NOSPLIT,$0-80
	JMP	syscall·Syscall6(SB)

TEXT ·SyscallNoError(SB),NOSPLIT,$0-48
	JAL	runtime·entersyscall(SB)
	MOVV	a1+8(FP), R4
	MOVV	a2+16(FP), R5
	MOVV	a3+24(FP), R6
	MOVV	R0, R7
	MOVV	R0, R8

	// On darwin/amd64, it requires 104 bytes.
	// We don't care about the values it returns.
	var siginfo [16]uint64
	psig := &siginfo[0]
	var e syscall.Errno
	for {
		_, _, e = syscall.Syscall6(syscall.SYS_WAITID, _P_PID, uintptr(p.Pid), uintptr(unsafe.Pointer(psig)), syscall.WEXITED|syscall.WNOWAIT, 0, 0)
		if e != syscall.EINTR {
			break
		}
	}
	runtime.KeepAlive(p)
	if e != 0 {

	RET
err:
	MOV	$-1, T0
	MOV	T0, r1+32(FP)	// r1
	MOV	ZERO, r2+40(FP)	// r2
	MOV	A0, err+48(FP)	// errno
	CALL	runtime·exitsyscall(SB)
	RET


// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
	CALL	runtime·entersyscall(SB)
	MOV	a1+8(FP), A0
	MOV	a2+16(FP), A1
	MOV	a3+24(FP), A2
	MOV	a4+32(FP), A3
	MOV	a5+40(FP), A4
	MOV	a6+48(FP), A5

	MOVD	ZR, r2+40(FP)	// r2
	MOVD	R0, err+48(FP)	// err
	RET
ok:
	MOVD	R0, r1+32(FP) // r1
	MOVD	R1, r2+40(FP)	// r2
	MOVD	ZR, err+48(FP)	// err
	RET

// func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT	·Syscall6(SB),NOSPLIT,$0-80
	BL	runtime·entersyscall<ABIInternal>(SB)
	MOVD	trap+0(FP), R17	// syscall entry
	MOVD	a1+8(FP), R0
	MOVD	a2+16(FP), R1
	MOVD	a3+24(FP), R2
	MOVD	a4+32(FP), R3

)

// Implemented in the runtime package (runtime/sys_openbsd3.go)
func syscall_syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)

//go:linkname syscall_syscall6 syscall.syscall6

func sysctl(mib []uint32, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) {

	// register number) is rounded up to the next even register number.
	// See https://github.com/ARM-software/abi-aa/blob/2bcab1e3b22d55170c563c3c7940134089176746/aapcs32/aapcs32.rst#parameter-passing
	r1, _, _ := syscall.Syscall6(posixFallocateTrap, uintptr(fd), 0, uintptr(off), uintptr(off>>32), uintptr(size), uintptr(size>>32))
	if r1 != 0 {
		return syscall.Errno(r1)
	}
	return nil