Where can I get the defination __i686.get_pc_thunk.bx function in an objectdump a test program linked with a shared library??

[Yihe Chen]

>
> It usually winds up in a section with a name like
> .text.__i686.get_pc_thunk.bx.  It doesn't necessarily wind up in the
> .text section, though it should certainly be in the text segment.  In
> any case, you readelf -s to see whether and where it is defined.
>
> Ian
>

First, thanks for your reply. I havn't expected to get answer from the blog 
author :)

Are you mean to list symbols info with "readelf -s ./libsub.so" ??  There 
isn't the
symbol in the output.

Apropos of .text.__i686.get_pc_thunk.bx section. I found there is something 
like this in
the source code of glibc, in ./sysdeps/unix/sysv/linux/i386/sysdep.h:

# ifndef HAVE_HIDDEN
#  define SETUP_PIC_REG(reg) \
  call 1f; 
\
  .subsection 1; 
\
1:movl (%esp), %e##reg; 
\
  ret; 
\
  .previous
# else
#  define SETUP_PIC_REG(reg) \
  .section .gnu.linkonce.t.__i686.get_pc_thunk.reg,"ax",@progbits; 
\
  .globl __i686.get_pc_thunk.reg; 
\
  .hidden __i686.get_pc_thunk.reg; 
\
  .type __i686.get_pc_thunk.reg,@function; 
\
__i686.get_pc_thunk.reg: 
\
  movl (%esp), %e##reg; 
\
  ret; 
\
  .size __i686.get_pc_thunk.reg, . - __i686.get_pc_thunk.reg; 
\
  .previous; 
\
  call __i686.get_pc_thunk.reg
# endif


It seems that the __i686.get_pc_thunk.bx is definded in section
.gnu.linkonce.t.__i686.get_pc_thunk.bx. Is this true??

When using "readelf -l ./libsub.so", I haven't found one section named like 
this in
.text segment. So is the section .gnu.linkonce.t.__i686.get_pc_thunk.bx. got 
deleted
in linking process? I'm not sure of this, but there is a "linkonce" in the 
name of the section.