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study/sabre/os/files/ProtectedMode/DPMI1.0Spec/api/310203.html

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+
+
+<h2>Set Processor Exception Handler Vector
+<img src="../0.9.gif" alt="[0.9]" width=22 height=17></h2>
+
+Sets the address of a handler for a CPU exception or fault, allowing a
+protected mode application to intercept processor exceptions (such as
+segment not present faults) that are not handled by the DPMI host and
+would otherwise generate a fatal error.  This function should be
+avoided by DPMI 1.0 clients (see Notes).<p>
+
+<b>Call With</b><br>
+<img src="r/ax+bl+cx+edx.gif" alt="" width=245 height=59><br>
+
+AX     = 0203H<br>
+BL     = exception/fault number (00H-1FH)<br>
+CX:(E)DX = selector:offset of exception handler<p>
+
+<b>Returns</b><br>
+<img src="r/ax+c.gif" alt="" width=245 height=59><br>
+
+<i>if function successful</i><br>
+Carry flag = clear<p>
+
+<i>if function unsuccessful</i><br>
+Carry flag = set<br>
+AX     = <a href="errors.html">error code</a>
+
+<table border=1 cellspacing=0 cellpadding=4>
+
+<tr><td>8021H</td><td>invalid value (BL not in range 0-1FH)</td></tr>
+
+<tr><td>8022H</td><td>invalid selector</td></tr>
+
+</table>
+
+<h2>Notes</h2><ul>
+
+
+<li>The value passed in CX should be a valid protected mode code
+(executable) selector, not a real mode segment address.<p>
+
+<li>32-bit clients must supply a 32-bit offset in the EDX register.
+If the client's handler chains to the next exception handler, it must
+do so using a 32-bit interrupt stack frame.<p>
+
+<li>Every exception is first examined by the DPMI host.  If the host
+does not handle the exception, it reflects the exception to the first
+handler in the protected mode exception handler chain.  See <a
+href="../ch4.5.html">that page</a> for a complete discussion of the
+environment and responsibilities of protected mode exception handlers
+installed with this function.<p>
+
+<li>Clients which run under DPMI 1.0 should use <a
+href="310212.html">Int 31H Functions 0212H</a> and <a
+href="310213.html">0213H</a> to set the addresses of exception
+handlers.  This function is supported by DPMI 1.0 hosts solely for
+compatibility with DPMI 0.9.<p>
+
+<li>Refer to the rules for descriptor usage in <a href="../descriptor-rules.html">Appendix D</a>.
+
+</ul>
+
+