// stack and outside the $GOMAXPROCS limit. crosscall2 calls
// runtime.cgocallback(_cgoexp_GoF, frame, ctxt) using the gc ABI.
// (crosscall2's framesize argument is no longer used, but there's one
// case where SWIG calls crosscall2 directly and expects to pass this
// argument. See _cgo_panic.)
//
// runtime.cgocallback (in asm_$GOARCH.s) switches from m.g0's stack
// to the original g (m.curg)'s stack, on which it calls

	// Used by the execution tracer.
	inMarkAssist bool
	coroexit     bool // argument to coroswitch_m

	raceignore    int8  // ignore race detection events
	nocgocallback bool  // whether disable callback from C
	tracking      bool  // whether we're tracking this G for sched latency statistics
	trackingSeq   uint8 // used to decide whether to track this G

func noEscapePtr[T any](p *T) *T {
	x := uintptr(unsafe.Pointer(p))
	return (*T)(unsafe.Pointer(x ^ 0))
}

// Not all cgocallback frames are actually cgocallback,
// so not all have these arguments. Mark them uintptr so that the GC
// does not misinterpret memory when the arguments are not present.
// cgocallback is not called from Go, only from crosscall2.
// This in turn calls cgocallbackg, which is where we'll find

	JAL	runtime·save_g(SB)
	MOVV	(g_stack+stack_hi)(g), R5
	MOVV	8(R29), R6
	SUBVU	R6, R5
	MOVV	R5, R29

	MOVW	R2, ret+16(FP)
	RET

// func cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
// See cgocall.go for more details.
TEXT ·cgocallback(SB),NOSPLIT,$24-24
	NO_LOCAL_POINTERS

	// Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g.
	// It is used to dropm while thread is exiting.

	JAL	runtime·save_g(SB)
	MOVW	(g_stack+stack_hi)(g), R5
	MOVW	20(R29), R6
	SUBU	R6, R5
	MOVW	R5, R29

	MOVW	R2, ret+8(FP)
	RET

// cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
// See cgocall.go for more details.
TEXT ·cgocallback(SB),NOSPLIT,$12-12
	NO_LOCAL_POINTERS

	// Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g.
	// It is used to dropm while thread is exiting.

	MOV	ZERO, ZERO	// NOP
	JMP	runtime·goexit1(SB)	// does not return
	// traceback from goexit1 must hit code range of goexit
	MOV	ZERO, ZERO	// NOP

// func cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
// See cgocall.go for more details.
TEXT ·cgocallback(SB),NOSPLIT,$24-24
	NO_LOCAL_POINTERS

	// Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g.
	// It is used to dropm while thread is exiting.

	BL	runtime·save_g(SB)
	MOVD	(g_stack+stack_hi)(g), R5
	MOVD	160(R15), R6
	SUB	R6, R5
	MOVD	R5, R15

	MOVW	R2, ret+16(FP)
	RET

// cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
// See cgocall.go for more details.
TEXT ·cgocallback(SB),NOSPLIT,$24-24
	NO_LOCAL_POINTERS

	// Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g.
	// It is used to dropm while thread is exiting.

	MOVW	R2, 16(R13)	// Save old stack pointer.
	BL	(R1)
	// Restore stack pointer.
	MOVW	16(R13), R2
	MOVW	R2, R13
	MOVW	R0, ret+8(FP)
	RET

// cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
// See cgocall.go for more details.
TEXT	·cgocallback(SB),NOSPLIT,$12-12
	NO_LOCAL_POINTERS

	// Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g.
	// It is used to dropm while thread is exiting.

	JAL	runtime·save_g(SB)
	MOVV	(g_stack+stack_hi)(g), R5
	MOVV	8(R3), R6
	SUBVU	R6, R5
	MOVV	R5, R3

	MOVW	R4, ret+16(FP)
	RET

// func cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
// See cgocall.go for more details.
TEXT ·cgocallback(SB),NOSPLIT,$24-24
	NO_LOCAL_POINTERS

	// Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g.
	// It is used to dropm while thread is exiting.

	MOVL	BX, 0(SP)	// first argument in x86-32 ABI
	CALL	AX

	MOVL	4(SP), CX	// restore original stack pointer
	MOVL	CX, SP
	MOVL	AX, ret+8(FP)
	RET

// cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
// See cgocall.go for more details.
TEXT ·cgocallback(SB),NOSPLIT,$12-12  // Frame size must match commented places below
	NO_LOCAL_POINTERS

	// Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g.