gistfile1.txt

[joe@x:/home/joe]% uname -a 
Linux x.com 2.6.32.3 #3 SMP Thu Feb 4 23:11:14 UTC 2010 x86_64 GNU/Linux
[joe@x:/home/joe]% cat /proc/version 
Linux version 2.6.32.3 ([email protected]) (gcc version 4.3.2 (Debian 4.3.2-1.1) ) #3 SMP Thu Feb 4 23:11:14 UTC 2010
[joe@x:/home/joe]% cat x.i
typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
extern fpu_control_t __fpu_control;
struct rtld_global_ro
{
  fpu_control_t _dl_fpu_control;
};
extern const struct rtld_global_ro _rtld_global_ro;
extern void __setfpucw (fpu_control_t);
int __libc_multiple_libcs __attribute__ ((visibility ("hidden"))) = 1;
int __libc_argc __attribute__ ((visibility ("hidden")));
char **__libc_argv __attribute__ ((visibility ("hidden")));
extern char **__environ;
extern void __init_misc (int, char **, char **);
extern void __libc_global_ctors (void);
extern int _dl_starting_up;
#pragma weak _dl_starting_up
void
__attribute__ ((visibility ("hidden")))
_init (int argc, char **argv, char **envp)
{
  __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
  if (!__libc_multiple_libcs
      && __fpu_control != _rtld_global_ro._dl_fpu_control)
    __setfpucw (__fpu_control);
  __libc_argc = argc;
  __libc_argv = argv;
  __environ = envp;
  __init_misc (argc, argv, envp);
  __libc_global_ctors ();
}
[joe@x:/home/joe]% gcc -m64   -march=core2 -fPIC -O2 x.i -c -fomit-frame-pointer
[joe@x:/home/joe]% objdump -dw x.o | grep rbp                                   
   5:	48 89 6c 24 f0       	mov    %rbp,-0x10(%rsp)
   f:	48 89 f5             	mov    %rsi,%rbp
  57:	48 89 2d 00 00 00 00 	mov    %rbp,0x0(%rip)        # 5e <_init+0x5e>
  6b:	48 89 ee             	mov    %rbp,%rsi
  7a:	48 8b 6c 24 08       	mov    0x8(%rsp),%rbp
[joe@x:/home/joe]% objdump -dw x.o                                              

x.o:     file format elf64-x86-64

Disassembly of section .text:

0000000000000000 <_init>:
   0:	48 89 5c 24 e8       	mov    %rbx,-0x18(%rsp)
   5:	48 89 6c 24 f0       	mov    %rbp,-0x10(%rsp)
   a:	4c 89 64 24 f8       	mov    %r12,-0x8(%rsp)
   f:	48 89 f5             	mov    %rsi,%rbp
  12:	48 83 ec 18          	sub    $0x18,%rsp
  16:	41 89 fc             	mov    %edi,%r12d
  19:	48 8b 05 00 00 00 00 	mov    0x0(%rip),%rax        # 20 <_init+0x20>
  20:	48 89 d3             	mov    %rdx,%rbx
  23:	48 85 c0             	test   %rax,%rax
  26:	75 65                	jne    8d <_init+0x8d>
  28:	48 8b 05 00 00 00 00 	mov    0x0(%rip),%rax        # 2f <_init+0x2f>
  2f:	c7 05 00 00 00 00 00 00 00 00 	movl   $0x0,0x0(%rip)        # 39 <_init+0x39>
  39:	0f b7 10             	movzwl (%rax),%edx
  3c:	48 8b 05 00 00 00 00 	mov    0x0(%rip),%rax        # 43 <_init+0x43>
  43:	66 39 10             	cmp    %dx,(%rax)
  46:	74 08                	je     50 <_init+0x50>
  48:	0f b7 fa             	movzwl %dx,%edi
  4b:	e8 00 00 00 00       	callq  50 <_init+0x50>
  50:	44 89 25 00 00 00 00 	mov    %r12d,0x0(%rip)        # 57 <_init+0x57>
  57:	48 89 2d 00 00 00 00 	mov    %rbp,0x0(%rip)        # 5e <_init+0x5e>
  5e:	48 8b 05 00 00 00 00 	mov    0x0(%rip),%rax        # 65 <_init+0x65>
  65:	48 89 da             	mov    %rbx,%rdx
  68:	48 89 18             	mov    %rbx,(%rax)
  6b:	48 89 ee             	mov    %rbp,%rsi
  6e:	44 89 e7             	mov    %r12d,%edi
  71:	e8 00 00 00 00       	callq  76 <_init+0x76>
  76:	48 8b 1c 24          	mov    (%rsp),%rbx
  7a:	48 8b 6c 24 08       	mov    0x8(%rsp),%rbp
  7f:	4c 8b 64 24 10       	mov    0x10(%rsp),%r12
  84:	48 83 c4 18          	add    $0x18,%rsp
  88:	e9 00 00 00 00       	jmpq   8d <_init+0x8d>
  8d:	8b 00                	mov    (%rax),%eax
  8f:	85 c0                	test   %eax,%eax
  91:	75 95                	jne    28 <_init+0x28>
  93:	c7 05 00 00 00 00 01 00 00 00 	movl   $0x1,0x0(%rip)        # 9d <_init+0x9d>
  9d:	eb b1                	jmp    50 <_init+0x50>