//
// asyncPreempt is implemented in assembly.
func asyncPreempt()

//go:nosplit
func asyncPreempt2() {
	gp := getg()
	gp.asyncSafePoint = true
	if gp.preemptStop {
		mcall(preemptPark)
	} else {
		mcall(gopreempt_m)
	}
	gp.asyncSafePoint = false
}

// asyncPreemptStack is the bytes of stack space required to inject an
// asyncPreempt call.
var asyncPreemptStack = ^uintptr(0)

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build ignore

/*
Input to cgo -godefs.  See also mkerrors.sh and mkall.sh
*/

// +godefs map struct_in_addr [4]byte /* in_addr */
// +godefs map struct_in6_addr [16]byte /* in6_addr */

package syscall

/*
#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE

		pcBuf[0] = uintptr(skip)
		if getg() == gp {
			nstk += fpTracebackPCs(unsafe.Pointer(getfp()), pcBuf[1:])
		} else if gp != nil {
			// Three cases:
			//
			// (1) We're called on the g0 stack through mcall(fn) or systemstack(fn). To
			// behave like gcallers above, we start unwinding from sched.bp, which
			// points to the caller frame of the leaf frame on g's stack. The return

	MOVD gobuf_ret(R0), RET0
	MOVD gobuf_ctxt(R0), CTXT
	// clear to help garbage collector
	MOVD $0, gobuf_sp(R0)
	MOVD $0, gobuf_ret(R0)
	MOVD $0, gobuf_ctxt(R0)

	I32Const $1
	Return

// func mcall(fn func(*g))
// Switch to m->g0's stack, call fn(g).
// Fn must never return. It should gogo(&g->sched)
// to keep running g.
TEXT runtime·mcall(SB), NOSPLIT, $0-8
	// CTXT = fn
	MOVD fn+0(FP), CTXT
	// R1 = g.m

		// } else {
		// hv2, hv1 = decoderune(ha, hv1)
		fn := typecheck.LookupRuntime("decoderune")
		call := mkcall1(fn, fn.Type().ResultsTuple(), &nif.Else, ha, hv1)
		a := ir.NewAssignListStmt(base.Pos, ir.OAS2, []ir.Node{hv2, hv1}, []ir.Node{call})
		nif.Else.Append(a)

		body = append(body, nif)

		if v1 != nil {

// C->Go callback thunk that allows to call runtime·racesymbolize from C code.
// Direct Go->C race call has only switched SP, finish g->g0 switch by setting correct g.
// The overall effect of Go->C->Go call chain is similar to that of mcall.
// RARG0 contains command code. RARG1 contains command-specific context.
// See racecallback for command codes.
TEXT	runtime·racecallbackthunk(SB), NOSPLIT|NOFRAME, $0-0
	// Handle command raceGetProcCmd (0) here.

// C->Go callback thunk that allows to call runtime·racesymbolize from C code.
// Direct Go->C race call has only switched SP, finish g->g0 switch by setting correct g.
// The overall effect of Go->C->Go call chain is similar to that of mcall.
// R0 contains command code. R1 contains command-specific context.
// See racecallback for command codes.
TEXT	runtime·racecallbackthunk(SB), NOSPLIT|NOFRAME, $0
	// Handle command raceGetProcCmd (0) here.

runtime and cgo code (8K in a pure Go binary; system-allocated in a
cgo binary).

Runtime code often temporarily switches to the system stack using
`systemstack`, `mcall`, or `asmcgocall` to perform tasks that must not
be preempted, that must not grow the user stack, or that switch user
goroutines. Code running on the system stack is implicitly

// C->Go callback thunk that allows to call runtime·racesymbolize from C code.
// Direct Go->C race call has only switched SP, finish g->g0 switch by setting correct g.
// The overall effect of Go->C->Go call chain is similar to that of mcall.
// RARG0 contains command code. RARG1 contains command-specific context.
// See racecallback for command codes.
TEXT	runtime·racecallbackthunk(SB), NOSPLIT|NOFRAME, $0
	// Handle command raceGetProcCmd (0) here.

	MOVV	gobuf_ret(R3), R1
	MOVV	gobuf_ctxt(R3), REGCTXT
	MOVV	R0, gobuf_sp(R3)
	MOVV	R0, gobuf_ret(R3)
	MOVV	R0, gobuf_lr(R3)
	MOVV	R0, gobuf_ctxt(R3)
	MOVV	gobuf_pc(R3), R4
	JMP	(R4)

// void mcall(fn func(*g))
// Switch to m->g0's stack, call fn(g).
// Fn must never return. It should gogo(&g->sched)
// to keep running g.
TEXT runtime·mcall(SB), NOSPLIT|NOFRAME, $0-8
	// Save caller state in g->sched