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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llvm-objdump doesn't show branch target properly for arm binaries"
href="https://bugs.llvm.org/show_bug.cgi?id=49386">49386</a>
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<tr>
<th>Summary</th>
<td>llvm-objdump doesn't show branch target properly for arm binaries
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>
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<th>Component</th>
<td>llvm-objdump
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yabinc@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24580" name="attach_24580" title="arm binary and disassembly outputs">attachment 24580</a> <a href="attachment.cgi?id=24580&action=edit" title="arm binary and disassembly outputs">[details]</a></span>
arm binary and disassembly outputs
It seems llvm-objdump have problem showing branch target properly for arm
binaries. Below is an example:
$ arm-linux-androideabi-objdump -dlC --no-show-raw-insn --start-address=0x784
--stop-address=0x7d4 simpleperf_runtest_two_functions_arm
00000784 <main>:
...
system/extras/simpleperf/runtest/two_functions.cpp:9
7a6: str.w r1, [r7, r0, lsl #2]
system/extras/simpleperf/runtest/two_functions.cpp:8
7aa: adds r1, #1
7ac: cmp r6, r1
7ae: bne.n 7a6 <main+0x22>
...
$ llvm-objdump -dlC --no-show-raw-insn --start-address=0x784
--stop-address=0x7d4 --print-imm-hex simpleperf_runtest_two_functions_arm
00000784 <main>:
...
; system/extras/simpleperf/runtest/two_functions.cpp:9
7a6: str.w r1, [r7, r0, lsl #2]
; system/extras/simpleperf/runtest/two_functions.cpp:8
7aa: adds r1, #0x1
7ac: cmp r6, r1
7ae: bne #-0xc <main+0x26>
...
By comparing the output of llvm-objdump and objdump. In the disassembly for
0x7ae:
1. llvm-objdump doesn't show a calculated target address. This is painful to
calculate manually.
2. the correct suffix should be <main+0x22> instead of <main+0x26>.</pre>
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