Merge branch 'feature/better_crash_dumps' into open-libmain

core/include/xtensa_ops.h

@@ -25,4 +25,19 @@
 #define ESYNC() asm volatile ( "esync" )
 #define DSYNC() asm volatile ( "dsync" )
 
+
+/* Read stack pointer to variable.
+ *
+ * Note that the compiler will push a stack frame (minimum 16 bytes)
+ * in the prelude of a C function that calls any other functions.
+ */
+#define SP(var) asm volatile ("mov %0, a1" : "=r" (var));
+
+/* Read the function return address to a variable.
+ *
+ * Depends on the containing function being simple enough that a0 is
+ * being used as a working register.
+ */
+#define RETADDR(var) asm volatile ("mov %0, a0" : "=r" (var))
+
 #endif /* _XTENSA_OPS_H */