tinygo/src/runtime/arch_cortexm.go

// +build cortexm

package runtime

import (
	"device/arm"
)

const GOARCH = "arm"

// The bitness of the CPU (e.g. 8, 32, 64).
const TargetBits = 32

// Align on word boundary.
func align(ptr uintptr) uintptr {
	return (ptr + 3) &^ 3
}

func getCurrentStackPointer() uintptr {
	return arm.ReadRegister("sp")
}