io/read.s

   1         .text
   2         .p2align 4,,15
   3         .globl  __libc_read
   4         .hidden __libc_read
   5         .type   __libc_read, @function
   6 __libc_read:
   7 #APP
   8 # 26 "../sysdeps/unix/sysv/linux/read.c" 1
   9         movl %fs:24,%eax
  10 # 0 "" 2
  11 #NO_APP
  12         testl   %eax, %eax
  13         jne     .L2
  14 #APP
  15 # 26 "../sysdeps/unix/sysv/linux/read.c" 1
  16         syscall
  17
  18 # 0 "" 2
  19 #NO_APP
  20         cmpq    $-4096, %rax
  21         ja      .L9
  22         rep ret
  23         .p2align 4,,10
  24         .p2align 3
  25 .L2:
  26         pushq   %r12
  27         pushq   %rbp
  28         movq    %rdx, %r12
  29         pushq   %rbx
  30         movq    %rsi, %rbp
  31         movl    %edi, %ebx
  32         subq    $16, %rsp
  33         call    __libc_enable_asynccancel
  34         movq    %r12, %rdx
  35         movl    %eax, %r8d
  36         movq    %rbp, %rsi
  37         movl    %ebx, %edi
  38         xorl    %eax, %eax
  39 #APP
  40 # 26 "../sysdeps/unix/sysv/linux/read.c" 1
  41         syscall
  42
  43 # 0 "" 2
  44 #NO_APP
  45         cmpq    $-4096, %rax
  46         ja      .L10
  47 .L4:
  48         movl    %r8d, %edi
  49         movq    %rax, 8(%rsp)
  50         call    __libc_disable_asynccancel
  51         movq    8(%rsp), %rax
  52         addq    $16, %rsp
  53         popq    %rbx
  54         popq    %rbp
  55         popq    %r12
  56         ret
  57         .p2align 4,,10
  58         .p2align 3
  59 .L9:
  60         movq    __libc_errno@gottpoff(%rip), %rdx
  61         negl    %eax
  62         movl    %eax, %fs:(%rdx)
  63         movq    $-1, %rax
  64         ret
  65 .L10:
  66         movq    __libc_errno@gottpoff(%rip), %rdx
  67         negl    %eax
  68         movl    %eax, %fs:(%rdx)
  69         movq    $-1, %rax
  70         jmp     .L4
  71         .size   __libc_read, .-__libc_read
  72         .weak   read
  73         .hidden read
  74         .set    read,__libc_read
  75         .weak   __read
  76         .hidden __read
  77         .set    __read,__libc_read
  78         .hidden __libc_disable_asynccancel
  79         .hidden __libc_enable_asynccancel