BEQ	sigtramp	// g.m == nil

	// Save m->libcall. We need to do this because we
	// might get interrupted by a signal in runtime·asmcgocall.
	MOVD	(m_libcall+libcall_fn)(R6), R7
	MOVD	R7, 96(R1)
	MOVD	(m_libcall+libcall_args)(R6), R7
	MOVD	R7, 104(R1)
	MOVD	(m_libcall+libcall_n)(R6), R7
	MOVD	R7, 112(R1)
	MOVD	(m_libcall+libcall_r1)(R6), R7
	MOVD	R7, 120(R1)
	MOVD	(m_libcall+libcall_r2)(R6), R7
	MOVD	R7, 128(R1)

	MOVQ	DI, 0(SP)
	MOVQ	AX, 8(SP)
	MOVQ	$runtime·badsignal(SB), AX
	CALL	AX
	JMP	exit

allgood:
	// Save m->libcall and m->scratch. We need to do this because we
	// might get interrupted by a signal in runtime·asmcgocall.

	// save m->libcall
	MOVQ	g_m(R10), BP
	LEAQ	m_libcall(BP), R11
	MOVQ	libcall_fn(R11), R10
	MOVQ	R10, 72(SP)
	MOVQ	libcall_args(R11), R10
	MOVQ	R10, 80(SP)
	MOVQ	libcall_n(R11), R10

	} else {
		mp = nil
	}

	var libcall libcall
	libcall.fn = uintptr(unsafe.Pointer(fn))
	libcall.n = 1
	// TODO(rsc): Why is noescape necessary here and below?
	libcall.args = uintptr(noescape(unsafe.Pointer(&a1)))
	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&libcall))
	if mp != nil {
		mp.libcallsp = 0
	}
	return libcall.r1, libcall.err
}

//go:nosplit

//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,

//
//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

	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

_2args:
	MOVD	(1*8)(R12), R1
_1args:
	MOVD	(0*8)(R12), R0
_0args:

	MOVD	libcall_fn(R19), R12	// branch to libcall->fn
	BL	(R12)

	MOVD	R20, RSP			// free stack space
	MOVD	R0, libcall_r1(R19)		// save return value to libcall->r1
	// TODO(rsc) floating point like amd64 in libcall->r2?

	// GetLastError
	MOVD	TEB_error(R18_PLATFORM), R0
	MOVD	R0, libcall_err(R19)

	// Restore callee-saved registers.

		// don't want that call's completion to zero
		// libcallsp.
		// We don't need to set libcall* while we're in a sighandler
		// (even if we're not currently in libc) because we block all
		// signals while we're handling a signal. That includes the
		// profile signal, which is the one that uses the libcall* info.
		mp = nil
	}
	res := asmcgocall(fn, arg)
	if mp != nil {
		mp.libcallsp = 0
	}
	return res

// asmsyscall6 calls the libc symbol using a C convention.
// It's defined in sys_aix_ppc64.go.
var asmsyscall6 libFunc

// syscallX functions must always be called with g != nil and m != nil,
// 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