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Date: Wed, 24 Jul 2013 09:44:00 -0000
Message-ID: <CAKhyrx8aDzz78UgWjUN78q7pWZ0=-Y3KH8oOkFb3P2RCK+F52Q@mail.gmail.com>
Subject: RE: cannot find bounds of function error
From: vijay nag <vijunag@gmail.com>
To: gdb@sourceware.org
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X-SW-Source: 2013-07/txt/msg00078.txt.bz2

Hello gdb-veterans,

My latest gdb-7.5  barfs out  "cannot find bounds of current function"
error when it encounters GNU_IFUNC while executing one line of code at
a time
using "next" command

(gdb) n
224	      if (1=3D=3Dfscanf(rva, "%d", &val)) {
(gdb) n
225		if (val) {
(gdb) n
237	      fclose(rva);
(gdb) n
242	      } else if (val) {
(gdb) n
252	  if (getenv("ARGV0")) {
(gdb) n
256	  init(argc, argv,
(gdb) n
268	  priv_init();
(gdb) n
273	  config.argv0short =3D strrchr(argv[0], '/');
(gdb) p &strrchr
$1 =3D (<text gnu-indirect-function variable, no debug info> *)
0x13b1b600 <strrchr>
(gdb) n
0x08048430 in ?? ()
(gdb) n
Cannot find bounds of current function
(gdb) n
Cannot find bounds of current function
(gdb) n
Cannot find bounds of current function
(gdb) n
Cannot find bounds of current function
(gdb) n
Cannot find bounds of current function
(gdb)

The corresponding assembly before strrchr func here is as below

0x122b6ca7 <main+498>   mov    0xc(%ebp),%ebx

                              =E2=94=82
   =E2=94=820x122b6caa <main+501>   movl   $0x2f,0x4(%esp)

                                  =E2=94=82
   =E2=94=820x122b6cb2 <main+509>   mov    (%ebx),%eax

                                  =E2=94=82
   =E2=94=820x122b6cb4 <main+511>   mov    %eax,(%esp)

                                  =E2=94=82
   =E2=94=820x122b6cb7 <main+514>   call   0x8048430

Here 0x8048430 appears to be a call to PLT and entry for strrchr seems
to be resolved already

(gdb) p /x *0x178ff5d8
$3 =3D 0x13b3b0d0
(gdb) info line *0x13b3b0d0
Line 42 of "../sysdeps/i386/i686/multiarch/strrchr-sse2-bsf.S" starts
at address 0x13b3b0d0 <__strrchr_sse2_bsf> and ends at 0x13b3b0d4
<__strrchr_sse2_bsf+4>.
(gdb)