| Issue |
58201
|
| Summary |
[llvm-objdump][x86] cs prefixes are not printed for -mindirect-branch-cs-prefix
|
| Labels |
tools:llvm-objdump
|
| Assignees |
|
| Reporter |
nickdesaulniers
|
When the Linux kernel is built with `-mindirect-branch-cs-prefix`
https://lore.kernel.org/all/[email protected]/
I was using `llvm-objdump -d vmlinux` to check that indirect calls to `__x86_indirect_thunk_r11` contained the `cs` prefix. It looked like they did not, which was surprising. Triple checking with GNU binutils' `objdump`, it looks like they are there:
```
$ llvm-objdump -d vmlinux | grep __x86_indirect_thunk_r11 | head -n 10
ffffffff8100071c: 2e e8 5e 2a 00 01 callq 0xffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff8100075c: 2e e8 1e 2a 00 01 callq 0xffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff810007a2: 2e e8 d8 29 00 01 callq 0xffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff81000e49: 2e e8 31 23 00 01 callq 0xffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff810027da: 2e e8 a0 09 00 01 callq 0xffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff810030dc: 2e e9 9e 00 00 01 jmp 0xffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff810031c8: 2e e8 b2 ff ff 00 callq 0xffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff81003316: 2e e8 64 fe ff 00 callq 0xffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff81003588: 2e e8 f2 fb ff 00 callq 0xffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff810035c4: 2e e8 b6 fb ff 00 callq 0xffffffff82003180 <__x86_indirect_thunk_r11>
$ objdump -d vmlinux | grep __x86_indirect_thunk_r11 | head -n 10
ffffffff8100071c: 2e e8 5e 2a 00 01 cs call ffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff8100075c: 2e e8 1e 2a 00 01 cs call ffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff810007a2: 2e e8 d8 29 00 01 cs call ffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff81000e49: 2e e8 31 23 00 01 cs call ffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff810027da: 2e e8 a0 09 00 01 cs call ffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff810030dc: 2e e9 9e 00 00 01 cs jmp ffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff810031c8: 2e e8 b2 ff ff 00 cs call ffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff81003316: 2e e8 64 fe ff 00 cs call ffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff81003588: 2e e8 f2 fb ff 00 cs call ffffffff82003180 <__x86_indirect_thunk_r11>
ffffffff810035c4: 2e e8 b6 fb ff 00 cs call ffffffff82003180 <__x86_indirect_thunk_r11>
```
You can see the range of bytes in the instruction is correct.
cc @phoebewang
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