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<base href="https://bugs.llvm.org/">
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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 - llvm-readobj prints wrong addresses for arm32 unwind info (-u)"
href="https://bugs.llvm.org/show_bug.cgi?id=47581">47581</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>llvm-readobj prints wrong addresses for arm32 unwind info (-u)
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>llvm-readobj
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rprichard@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>jh7370.2008@my.bristol.ac.uk, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23983" name="attach_23983" title="test binary">attachment 23983</a> <a href="attachment.cgi?id=23983&action=edit" title="test binary">[details]</a></span>
test binary
cat >test.c << EOF
void func1() {}
void func2() { func1(); }
void func3() {}
EOF
$ clang -target arm-linux-gnueabi test.c -fpic -shared -nostdlib
-funwind-tables
$ nm a.out | grep func
00000230 T func1
00000234 T func2
00000248 T func3
$ readelf -u a.out
Unwind section '.ARM.exidx' at offset 0x24c contains 4 entries:
0x230 <func1>: 0x80b0b0b0
Compact model index: 0
0xb0 finish
0xb0 finish
0xb0 finish
0x234 <func2>: 0x809b8480
Compact model index: 0
0x9b vsp = r11
0x84 0x80 pop {r11, r14}
0x248 <func3>: 0x80b0b0b0
Compact model index: 0
0xb0 finish
0xb0 finish
0xb0 finish
0x24c <func3+0x4>: 0x1 [cantunwind]
$ /x/llvm-upstream/stage1/bin/llvm-readobj --unwind a.out
File: a.out
Format: elf32-littlearm
Arch: arm
AddressSize: 32bit
LoadName:
UnwindInformation {
UnwindIndexTable {
SectionIndex: 9
SectionName: .ARM.exidx
SectionOffset: 0x24C
Entries [
Entry {
FunctionAddress: 0x230
FunctionName: func1
Model: Compact (Inline)
PersonalityIndex: 0
Opcodes [
0xB0 ; finish
0xB0 ; finish
0xB0 ; finish
]
}
Entry {
FunctionAddress: 0x22C
Model: Compact (Inline)
PersonalityIndex: 0
Opcodes [
0x9B ; vsp = r11
0x84 0x80 ; pop {fp, lr}
]
}
Entry {
FunctionAddress: 0x238
Model: Compact (Inline)
PersonalityIndex: 0
Opcodes [
0xB0 ; finish
0xB0 ; finish
0xB0 ; finish
]
}
Entry {
FunctionAddress: 0x234
FunctionName: func2
Model: CantUnwind
}
]
}
}
binutils readobj and nm reports these addresses:
- func1 == 0x230
- func2 == 0x234
- func3 == 0x248
- end == 0x24c
llvm-readobj reports these addresses:
- func1 == 0x230
- func2 == 0x22C
- func3 == 0x238
- end == 0x234</pre>
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