debug/fgets_u_chk.s

   1         .text
   2         .p2align 4,,15
   3         .globl  __fgets_unlocked_chk
   4         .type   __fgets_unlocked_chk, @function
   5 __fgets_unlocked_chk:
   6 .LFB68:
   7         testl   %edx, %edx
   8         jle     .L7
   9         pushq   %r13
  10         pushq   %r12
  11         movslq  %edx, %rdx
  12         pushq   %rbp
  13         pushq   %rbx
  14         subq    $1, %rdx
  15         movq    %rcx, %rbx
  16         movq    %rsi, %r12
  17         movq    %rdi, %r13
  18         subq    $8, %rsp
  19         movl    (%rcx), %eax
  20         movl    $1, %r8d
  21         movl    %eax, %ebp
  22         andl    $-33, %eax
  23         andl    $32, %ebp
  24         cmpq    %rsi, %rdx
  25         movl    %eax, (%rcx)
  26         cmova   %rsi, %rdx
  27         movl    $10, %ecx
  28         movq    %rdi, %rsi
  29         movq    %rbx, %rdi
  30         call    _IO_getline
  31         movq    %rax, %rcx
  32         xorl    %eax, %eax
  33         movl    (%rbx), %edx
  34         testq   %rcx, %rcx
  35         je      .L4
  36         testb   $32, %dl
  37         je      .L5
  38         movq    __libc_errno@gottpoff(%rip), %rsi
  39         xorl    %eax, %eax
  40         cmpl    $11, %fs:(%rsi)
  41         je      .L5
  42 .L4:
  43         orl     %edx, %ebp
  44         movl    %ebp, (%rbx)
  45         addq    $8, %rsp
  46         popq    %rbx
  47         popq    %rbp
  48         popq    %r12
  49         popq    %r13
  50         ret
  51         .p2align 4,,10
  52         .p2align 3
  53 .L5:
  54         cmpq    %rcx, %r12
  55         jbe     .L17
  56         movb    $0, 0(%r13,%rcx)
  57         movl    (%rbx), %edx
  58         movq    %r13, %rax
  59         orl     %edx, %ebp
  60         movl    %ebp, (%rbx)
  61         addq    $8, %rsp
  62         popq    %rbx
  63         popq    %rbp
  64         popq    %r12
  65         popq    %r13
  66         ret
  67         .p2align 4,,10
  68         .p2align 3
  69 .L7:
  70         xorl    %eax, %eax
  71         ret
  72 .L17:
  73         call    __chk_fail
  74 .LFE68:
  75         .size   __fgets_unlocked_chk, .-__fgets_unlocked_chk
  76         .hidden __chk_fail
  77         .hidden _IO_getline