Please forgive my ignorance.<br><br>&gt; This function is used to switch the stack and execute a given function.<br><br>Why do we have to switch the stack?<br>For instance, what would happen if we do not switch the stack?<br>
<br>Regards,<br>Jaeyong<br><br><div class="gmail_quote">On Tue, Jan 8, 2013 at 7:31 PM, Sebastian Sumpf <span dir="ltr">&lt;<a href="mailto:Sebastian.Sumpf@...1..." target="_blank">Sebastian.Sumpf@...1...</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Jaeyong,<br>
<div class="im"><br>
On 01/08/2013 03:26 AM, jaeyong yoo wrote:<br>
&gt; Hello,<br>
&gt;<br>
&gt; Could you explain about the intend behind platform_execute in usb_drv?<br>
&gt; I see it is similar to executing a function but it uses stack allocated<br>
&gt; by dde_kit_simple_malloc, and I don&#39;t understand why.<br>
<br>
</div>This function is used to switch the stack and execute a given function.<br>
Since stack switching has to be performed in assembly, the function must<br>
be implemented for each platform (e.g. ARM, x86). In the great picture<br>
this is part of a very simple user-threading implementation. Each<br>
&quot;pseudo&quot; thread needs a stack to need lose its call trace, such a thread<br>
is scheduled using setjmp/longjmp calls (see:<br>
dde_linux/src/drivers/usb/routine.h).<br>
<br>
<br>
Regards,<br>
<br>
Sebastian<br>
<br>
<br>
<br>
--<br>
Sebastian Sumpf<br>
Genode Labs<br>
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