[ELF][llvm-objdump]Wrong comment when parse `atexit()`

[cabbaken]

I have this simple code:

#include <stdlib.h>

void foo() 
{
  int a = 1, b = 2;
}

int main()
{
  atexit(foo);

  return 0;
}

And I compiled with

clang t.c

then the output of comment in <atexit> with llvm-objdump -D and objdump -D below are different:
llvm-objdump -D :

0000000000001170 <atexit>:
    1170: f3 0f 1e fa                   endbr64
    1174: 48 8b 15 8d 2e 00 00          movq    0x2e8d(%rip), %rdx      # 0x4008 <__dso_handle>
    117b: 31 f6                         xorl    %esi, %esi
    117d: ff 25 4d 2e 00 00             jmpq    *0x2e4d(%rip)           # 0x3fd0 <__libc_start_main@GLIBC_2.34+0x3fd0>

objdump -D :

0000000000001170 <atexit>:
    1170:       f3 0f 1e fa             endbr64
    1174:       48 8b 15 8d 2e 00 00    mov    0x2e8d(%rip),%rdx        # 4008 <__dso_handle>
    117b:       31 f6                   xor    %esi,%esi
    117d:       ff 25 4d 2e 00 00       jmp    *0x2e4d(%rip)        # 3fd0 <__cxa_atexit@GLIBC_2.2.5>

[llvmbot]

@llvm/issue-subscribers-tools-llvm-objdump

Author: Ruoyu Qiu (cabbaken)

I have this simple code: ```c #include <stdlib.h>

void foo()
{
int a = 1, b = 2;
}

int main()
{
atexit(foo);

return 0;
}

And I compiled with
```bash
clang t.c

then the output of comment in <atexit> with llvm-objdump -D and objdump -D below are different:
llvm-objdump -D :

0000000000001170 <atexit>:
    1170: f3 0f 1e fa                   endbr64
    1174: 48 8b 15 8d 2e 00 00          movq    0x2e8d(%rip), %rdx      # 0x4008 <__dso_handle>
    117b: 31 f6                         xorl    %esi, %esi
    117d: ff 25 4d 2e 00 00             jmpq    *0x2e4d(%rip)           # 0x3fd0 &lt;__libc_start_main@<!-- -->GLIBC_2.34+0x3fd0&gt;

objdump -D :

0000000000001170 <atexit>:
    1170:       f3 0f 1e fa             endbr64
    1174:       48 8b 15 8d 2e 00 00    mov    0x2e8d(%rip),%rdx        # 4008 <__dso_handle>
    117b:       31 f6                   xor    %esi,%esi
    117d:       ff 25 4d 2e 00 00       jmp    *0x2e4d(%rip)        # 3fd0 &lt;__cxa_atexit@<!-- -->GLIBC_2.2.5&gt;

[MaskRay]

clang t.c

You liked compiled with -static or -static-pie so that the executable defines atexit.

The llvm-objdump -d output looks correct here

000000000022c6c0 <atexit>:
  22c6c0: f3 0f 1e fa                   endbr64
  22c6c4: 48 8b 15 9d fe 07 00          movq    0x7fe9d(%rip), %rdx     # 0x2ac568 <__dso_handle>
  22c6cb: 31 f6                         xorl    %esi, %esi
  22c6cd: e9 1e fc ff ff                jmp     0x22c2f0 <__cxa_atexit>