go/src/runtime/export_debug_test.go

// InjectDebugCall injects a debugger call to fn into g. regArgs must
// contain any arguments to fn that are passed in registers, according
// to the internal Go ABI. It may be nil if no arguments are passed in
// registers to fn. args must be a pointer to a valid call frame (including
// arguments and return space) for fn, or nil. tkill must be a function that
// will send SIGTRAP to thread ID tid. gp must be locked to its OS thread and
// running.
//
// On success, InjectDebugCall returns the panic value of fn or nil.
// If fn did not panic, its results will be available in args.
func InjectDebugCall(gp *g, fn any, regArgs *abi.RegArgs, stackArgs any, tkill func(tid int) error, returnOnUnsafePoint bool) (any, error) { … }

type debugCallHandler …

func (h *debugCallHandler) inject(info *siginfo, ctxt *sigctxt, gp2 *g) bool { … }

func (h *debugCallHandler) handle(info *siginfo, ctxt *sigctxt, gp2 *g) bool { … }