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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - missassembly of call to aligned local symbol"
href="http://llvm.org/bugs/show_bug.cgi?id=21997">21997</a>
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<th>Summary</th>
<td>missassembly of call to aligned local symbol
</td>
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<th>Product</th>
<td>tools
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>llvm-as
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>luddy.harrison@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13583" name="attach_13583" title="foo.s: example of bug; bar.s: fixed by moving L downstream">attachment 13583</a> <a href="attachment.cgi?id=13583&action=edit" title="foo.s: example of bug; bar.s: fixed by moving L downstream">[details]</a></span>
foo.s: example of bug; bar.s: fixed by moving L downstream
when .balign is applied to a local label in the text section, and that symbol
is called at a later point in the same assembly file, the assembler appears to
generate an incorrect relocation that causes a bad pc to be formed by the call.
the result is a bus error. the bug seems not to occur if the aligned local
symbol is downstream of
the call site.
I've attached a small test case that reproduces the behavior. here's the
offending code:
.globl _main
.text
.balign 1<<4, 0x90
L:
ret
_main:
call L // gets a bad pc for L
xorq %rax, %rax
ret</pre>
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