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