//	a1    uintptr
//	a2    uintptr
//	a3    uintptr
//	r1    uintptr
//	r2    uintptr
//	err   uintptr
// }
// syscall must be called on the g0 stack with the
// C calling convention (use libcCall).
//
// syscall expects a 32-bit result and tests for 32-bit -1
// to decide there was an error.
TEXT runtime·syscall(SB),NOSPLIT,$0
	MOVW	R13, R9
	BIC     $0x7, R13		// align for ELF ABI

	MOVW	R0, R8

//	a1    uintptr
//	a2    uintptr
//	a3    uintptr
//	r1    uintptr
//	r2    uintptr
//	err   uintptr
// }
// syscall must be called on the g0 stack with the
// C calling convention (use libcCall).
//
// syscall expects a 32-bit result and tests for 32-bit -1
// to decide there was an error.
TEXT runtime·syscall(SB),NOSPLIT,$16
	MOVQ	(0*8)(DI), CX // fn
	MOVQ	(2*8)(DI), SI // a2

//	a1    uintptr
//	a2    uintptr
//	a3    uintptr
//	r1    uintptr
//	r2    uintptr
//	err   uintptr
// }
// syscall must be called on the g0 stack with the
// C calling convention (use libcCall).
TEXT runtime·syscall(SB),NOSPLIT,$0
	SUB	$16, RSP	// push structure pointer
	MOVD	R0, 8(RSP)

	MOVD	0(R0), R12	// fn
	MOVD	16(R0), R1	// a2
	MOVD	24(R0), R2	// a3
	MOVD	8(R0), R0	// a1

//	a1    uintptr
//	a2    uintptr
//	a3    uintptr
//	r1    uintptr
//	r2    uintptr
//	err   uintptr
// }
// syscall must be called on the g0 stack with the
// C calling convention (use libcCall).
//
// syscall expects a 32-bit result and tests for 32-bit -1
// to decide there was an error.
TEXT runtime·syscall(SB),NOSPLIT,$0
	PUSHL	BP
	MOVL	SP, BP

	SUBL	$12, SP

		mp.libcallsp = getcallersp()
	} else {
		mp = nil
	}

	var libcall libcall
	libcall.fn = uintptr(unsafe.Pointer(fn))
	libcall.n = 4
	libcall.args = uintptr(noescape(unsafe.Pointer(&a1)))
	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&libcall))
	if mp != nil {
		mp.libcallsp = 0
	}
	return libcall.r1
}

//go:nosplit
//go:cgo_unsafe_args

// as it relies on g.m.libcall to pass arguments to asmcgocall.
// The few cases where syscalls haven't a g or a m must call their equivalent
// function in sys_aix_ppc64.s to handle them.

//go:nowritebarrier
//go:nosplit
func syscall0(fn *libFunc) (r, err uintptr) {
	gp := getg()
	mp := gp.m
	resetLibcall := true
	if mp.libcallsp == 0 {
		mp.libcallg.set(gp)
		mp.libcallpc = getcallerpc()

//
//go:nosplit
func stdcall_no_g(fn stdFunction, n int, args uintptr) uintptr {
	libcall := libcall{
		fn:   uintptr(unsafe.Pointer(fn)),
		n:    uintptr(n),
		args: args,
	}
	asmstdcall_trampoline(noescape(unsafe.Pointer(&libcall)))
	return libcall.r1
}

// Calling stdcall on os stack.
// May run during STW, so write barriers are not allowed.
//
//go:nowritebarrier

//go:nosplit
//go:cgo_unsafe_args
func doMmap(addr, n, prot, flags, fd, off uintptr) (uintptr, uintptr) {
	var libcall libcall
	libcall.fn = uintptr(unsafe.Pointer(&libc_mmap))
	libcall.n = 6
	libcall.args = uintptr(noescape(unsafe.Pointer(&addr)))
	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&libcall))
	return libcall.r1, libcall.err
}

//go:nosplit
func munmap(addr unsafe.Pointer, n uintptr) {

func syscall_chdir(path uintptr) (err uintptr) {
	call := libcall{
		fn:   uintptr(unsafe.Pointer(&libc_chdir)),
		n:    1,
		args: uintptr(unsafe.Pointer(&path)),
	}
	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&call))
	return call.err
}

//go:nosplit
//go:linkname syscall_chroot
func syscall_chroot(path uintptr) (err uintptr) {
	call := libcall{
		fn:   uintptr(unsafe.Pointer(&libc_chroot)),
		n:    1,

	MOVM.DB.W [R4, R5, R14], (R13)	// push {r4, r5, lr}
	MOVW	R0, R4			// put libcall * in r4
	MOVW	R13, R5			// save stack pointer in r5

	// SetLastError(0)
	MOVW	$0, R0
	MRC	15, 0, R1, C13, C0, 2
	MOVW	R0, 0x34(R1)

	MOVW	8(R4), R12	// libcall->args

	// Do we have more than 4 arguments?
	MOVW	4(R4), R0	// libcall->n
	SUB.S	$4, R0, R2
	BLE	loadregs

	// Reserve stack space for remaining args