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      <base href="http://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - MIPS does not implement __builtin_eh_return_data_regno correctly"
   href="http://llvm.org/bugs/show_bug.cgi?id=15225">15225</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>MIPS does not implement __builtin_eh_return_data_regno correctly
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.2
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>-New Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>awg@embtoolkit.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=9995" name="attach_9995" title="Proposed fix">attachment 9995</a> <a href="attachment.cgi?id=9995&action=edit" title="Proposed fix">[details]</a></span>
Proposed fix

Current MIPS TargetInfo (MipsTargetInfoBase) does not implement
getEHDataRegisterNumber() ie __builtin_eh_return_data_regno().
This makes c++ exception handling not working with libcxx/libcxxrt as
libcxxrt __gxx_personality_v0() function uses this builtin.

The simple attached patch makes the following test code works without
aborting, with libcxx/libcxxrt used as c++ standard library.

#include <stdio.h>
#include <exception>

int main(int argc, char **argv)
{
    try {
        throw 20;
    } catch (int e) {
        printf("Exception Nr %d occurred\n", e);
    }

    return 0;
}</pre>
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