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<title>6.4 Initial exception handler state</title>

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  <a name="1102319"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">6.4 	 Initial exception handler state</font>
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  <a name="1102320"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">When the exception handler starts, <span class=Signal>Wptr</span> is set to the address of the exception control block. The work space of the exception handler is normally below the control block, so like a function or procedure call, one of the first actions of the exception handler code is to adjust the <span class=Signal>Wptr</span> downwards to create space for local variables using <strong>ajw</strong>. The <span class=Signal>Wptr</span> must be adjusted back up again before the handler returns.</font>
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  <a name="1102321"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The initial <span class=Signal>Iptr</span> of the exception handler is the value loaded from <span class=Signal>ex.HandlerIptr</span> in the exception control block. The state of the interrupted or trapped process is saved in the exception control block. If the exception is an idle trap then the saved state is the state of the last descheduled process. Initially the <span class=Signal>Status</span> register is set to the values shown in <a href="except5.htm#1102401"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Table

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