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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llvm-objdump doesn't list symbols in ppc64 objects, but does so in ppc64le ones"
href="https://bugs.llvm.org/show_bug.cgi?id=50010">50010</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>llvm-objdump doesn't list symbols in ppc64 objects, but does so in ppc64le ones
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>llvm-objdump
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nabijaczleweli@nabijaczleweli.xyz
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Consider the following C code:
int symbol_a(void) {
return 'a';
}
int symbol_b(void) {
return 'b';
}
When built for ppc64el, everything appears in order:
$ cc -target ppc64le-unknown-linux-gnu a.c -c -oa.o
$ llvm-objdump -d a.o
a.o: file format elf64-powerpcle
Disassembly of section .text:
0000000000000000 <symbol_a>:
0: 61 00 60 38 li 3, 97
4: 20 00 80 4e blr
...
14: 00 00 00 60 nop
18: 00 00 00 60 nop
1c: 00 00 00 60 nop
0000000000000020 <symbol_b>:
20: 62 00 60 38 li 3, 98
24: 20 00 80 4e blr
...
But when building for ppc64, the symbol listing is gone:
$ cc -target ppc64-unknown-linux-gnu a.c -c -oa.o
$ llvm-objdump -d a.o
a.o: file format elf64-powerpc
Disassembly of section .text:
0000000000000000 <.text>:
0: 38 60 00 61 li 3, 97
4: 4e 80 00 20 blr
...
14: 38 60 00 62 li 3, 98
18: 4e 80 00 20 blr
...
Both object files have a symtab:
$ llvm-objdump -h a.o
a.o: file format elf64-powerpcle
Sections:
Idx Name Size VMA Type
0 00000000 0000000000000000
1 .strtab 00000063 0000000000000000
2 .text 00000034 0000000000000000 TEXT
3 .<a href="show_bug.cgi?id=50010#c00000056">comment 00000056</a> 0000000000000000
4 .note.GNU-stack 00000000 0000000000000000
5 .eh_frame 00000040 0000000000000000 DATA
6 .rela.eh_frame 00000030 0000000000000000
7 .llvm_addrsig 00000000 0000000000000000
8 .symtab 00000078 0000000000000000
$ llvm-objdump -h a.o
a.o: file format elf64-powerpc
Sections:
Idx Name Size VMA Type
0 00000000 0000000000000000
1 .strtab 00000073 0000000000000000
2 .text 00000028 0000000000000000 TEXT
3 .opd 00000030 0000000000000000 DATA
4 .rela.opd 00000060 0000000000000000
5 .<a href="show_bug.cgi?id=50010#c00000056">comment 00000056</a> 0000000000000000
6 .note.GNU-stack 00000000 0000000000000000
7 .eh_frame 00000040 0000000000000000 DATA
8 .rela.eh_frame 00000030 0000000000000000
9 .llvm_addrsig 00000000 0000000000000000
10 .symtab 00000090 0000000000000000
And on rudimentary inspexion, both objects' symtabs appear to contain the
names.
My toolchain is as follows
Debian clang version
13.0.0-++20210415102640+07edd7899392-1~exp1~20210415203405.1444
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /bin
obtained from the current buster nightly packages.</pre>
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