<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [PATCH] Make mcount function names match gcc on arm and arm64 Linux"
   href="https://llvm.org/bugs/show_bug.cgi?id=27248">27248</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[PATCH] Make mcount function names match gcc on arm and arm64 Linux
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>3.8
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

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

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

        <tr>
          <th>Severity</th>
          <td>normal
          </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>bero@linaro.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=16175" name="attach_16175" title="Adjust mcount name to match gcc">attachment 16175</a> <a href="attachment.cgi?id=16175&action=edit" title="Adjust mcount name to match gcc">[details]</a></span>
Adjust mcount name to match gcc

Currently, clang names the mcount function from -pg "_mcount" on PPC Linux and
"mcount" on any other Linux.

In gcc, this matches the behavior on PPC and x86 (both 32 and 64); but on
aarch64 the function is called "_mcount" and on arm32 it's called
"__gnu_mcount_nc".

This mismatch in naming causes the Linux kernel to miscompile for arm (32 and
64) if CONFIG_FUNCTION_TRACER is enabled.

The attached patch fixes this by matching the expected name of the mcount
function.</pre>
        </div>
      </p>
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