malloc/scratch_buffer_grow.s

   1         .text
   2         .p2align 4,,15
   3         .globl  __libc_scratch_buffer_grow
   4         .hidden __libc_scratch_buffer_grow
   5         .type   __libc_scratch_buffer_grow, @function
   6 __libc_scratch_buffer_grow:
   7         pushq   %r12
   8         pushq   %rbp
   9         pushq   %rbx
  10         movq    %rdi, %rbx
  11         movq    8(%rdi), %rax
  12         movq    (%rdi), %rdi
  13         leaq    16(%rbx), %r12
  14         leaq    (%rax,%rax), %rbp
  15         cmpq    %r12, %rdi
  16         je      .L2
  17         call    free@PLT
  18         movq    8(%rbx), %rax
  19 .L2:
  20         cmpq    %rbp, %rax
  21         ja      .L3
  22         movq    %rbp, %rdi
  23         call    malloc@PLT
  24         testq   %rax, %rax
  25         je      .L4
  26         movq    %rax, (%rbx)
  27         movq    %rbp, 8(%rbx)
  28         movl    $1, %eax
  29         popq    %rbx
  30         popq    %rbp
  31         popq    %r12
  32         ret
  33         .p2align 4,,10
  34         .p2align 3
  35 .L3:
  36         movq    __libc_errno@gottpoff(%rip), %rax
  37         movl    $12, %fs:(%rax)
  38 .L4:
  39         movq    %r12, (%rbx)
  40         movq    $1024, 8(%rbx)
  41         xorl    %eax, %eax
  42         popq    %rbx
  43         popq    %rbp
  44         popq    %r12
  45         ret
  46         .size   __libc_scratch_buffer_grow, .-__libc_scratch_buffer_grow