<p><b>@benpicco</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/12276#discussion_r327262100">cpu/fe310/include/context_frame.h</a>:</p>
<pre style='color:#555'>>  /** @} */
 
 /**
  * @brief Size of context switch frame
  */
-#define CONTEXT_FRAME_SIZE (a7_OFFSET + 4)
+#define CONTEXT_FRAME_SIZE (pad_OFFSET + 12)
</pre>
<p>So you want to do <code>sizeof(struct context_switch_frame)</code></p>

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