MOVW	fn+0(FP), R1	// R1 = fn
	MOVW	R1, REGCTXT	// context
	MOVW	g_m(g), R2	// R2 = m

	MOVW	m_gsignal(R2), R3	// R3 = gsignal
	BEQ	g, R3, noswitch

	MOVW	m_g0(R2), R3	// R3 = g0
	BEQ	g, R3, noswitch

	MOVW	m_curg(R2), R4
	BEQ	g, R4, switch

	// Bad: g is not gsignal, not g0, not curg. What is it?
	// Hide call from linker nosplit analysis.
	MOVW	$runtime·badsystemstack(SB), R4
	JAL	(R4)

	// We won't get a nested signal.
	MOVBZ	runtime·iscgo(SB), R22
	CMP	R22, $0
	BNE	nosaveg
	MOVD	m_gsignal(R21), R22	// g.m.gsignal
	CMP	R22, $0
	BEQ	nosaveg

	CMP	g, R22
	BEQ	nosaveg
	MOVD	(g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo
	MOVD	g, (R22)

	BL	(CTR)	// Call from VDSO

	MOVD	$0, (R22)	// clear g slot, R22 is unchanged by C code

	JMP	finish

	MOVV	fn+0(FP), R19	// R19 = fn
	MOVV	R19, REGCTXT		// context
	MOVV	g_m(g), R4	// R4 = m

	MOVV	m_gsignal(R4), R5	// R5 = gsignal
	BEQ	g, R5, noswitch

	MOVV	m_g0(R4), R5	// R5 = g0
	BEQ	g, R5, noswitch

	MOVV	m_curg(R4), R6
	BEQ	g, R6, switch

	// Bad: g is not gsignal, not g0, not curg. What is it?
	// Hide call from linker nosplit analysis.
	MOVV	$runtime·badsystemstack(SB), R7
	JAL	(R7)

	MOVD	fn+0(FP), R3	// R3 = fn
	MOVD	R3, R11		// context
	MOVD	g_m(g), R4	// R4 = m

	MOVD	m_gsignal(R4), R5	// R5 = gsignal
	CMP	g, R5
	BEQ	noswitch

	MOVD	m_g0(R4), R5	// R5 = g0
	CMP	g, R5
	BEQ	noswitch

	MOVD	m_curg(R4), R6
	CMP	g, R6
	BEQ	switch

	// Bad: g is not gsignal, not g0, not curg. What is it?
	// Hide call from linker nosplit analysis.
	MOVD	$runtime·badsystemstack(SB), R12

	MOVD	fn+0(FP), R3	// R3 = fn
	MOVD	R3, R26		// context
	MOVD	g_m(g), R4	// R4 = m

	MOVD	m_gsignal(R4), R5	// R5 = gsignal
	CMP	g, R5
	BEQ	noswitch

	MOVD	m_g0(R4), R5	// R5 = g0
	CMP	g, R5
	BEQ	noswitch

	MOVD	m_curg(R4), R6
	CMP	g, R6
	BEQ	switch

	// Bad: g is not gsignal, not g0, not curg. What is it?
	// Hide call from linker nosplit analysis.
	MOVD	$runtime·badsystemstack(SB), R3

	MOVQ	DX, (g_sched+gobuf_ctxt)(DI)

	MOVQ	m_g0(BX), SI  // SI = m.g0
	CMPQ	DI, SI
	JNE	3(PC)
	CALL	runtime·badmorestackg0(SB)
	CALL	runtime·abort(SB)

	// Cannot grow signal stack (m->gsignal).
	MOVQ	m_gsignal(BX), SI
	CMPQ	DI, SI
	JNE	3(PC)
	CALL	runtime·badmorestackgsignal(SB)
	CALL	runtime·abort(SB)

	// Called from f.
	// Set m->morebuf to f's caller.

	gp := getg()
	if old != nil {
		old.stack = gp.m.gsignal.stack
		old.stackguard0 = gp.m.gsignal.stackguard0
		old.stackguard1 = gp.m.gsignal.stackguard1
		old.stktopsp = gp.m.gsignal.stktopsp
	}
	stsp := uintptr(unsafe.Pointer(st.ss_sp))
	gp.m.gsignal.stack.lo = stsp
	gp.m.gsignal.stack.hi = stsp + st.ss_size
	gp.m.gsignal.stackguard0 = stsp + stackGuard
	gp.m.gsignal.stackguard1 = stsp + stackGuard
}

//
// Ensure mayMoreStackPreempt can be called for all ABIs.
//
//go:nosplit
//go:linkname mayMoreStackPreempt
func mayMoreStackPreempt() {
	// Don't do anything on the g0 or gsignal stack.
	gp := getg()
	if gp == gp.m.g0 || gp == gp.m.gsignal {
		return
	}
	// Force a preemption, unless the stack is already poisoned.
	if gp.stackguard0 < stackPoisonMin {
		gp.stackguard0 = stackPreempt
	}
}

	"internal/goarch"
	"internal/stringslite"
	"unsafe"
)

// May run during STW, so write barriers are not allowed.
//
//go:nowritebarrierrec
func sighandler(_ureg *ureg, note *byte, gp *g) int {
	gsignal := getg()
	mp := gsignal.m

	var t sigTabT
	var docrash bool
	var sig int
	var flags int
	var level int32

	c := &sigctxt{_ureg}
	notestr := gostringnocopy(note)

	grep -v 'SIGSTKSIZE\|SIGSTKSZ\|SIGRT\|SIGMAX64' |
	sort >_signal.grep

echo '// mkerrors.sh' "$@"
echo '// Code generated by the command above; see README.md. DO NOT EDIT.'
echo
echo "//go:build ${GOARCH} && ${GOOS}"
echo
go tool cgo -godefs -- "$@" _const.go >_error.out
cat _error.out | grep -vf _error.grep | grep -vf _signal.grep
echo
echo '// Errors'
echo 'const ('