contrib/compiler-rt/lib/builtins/i386/chkstk.S

   1 // This file is dual licensed under the MIT and the University of Illinois Open
   2 // Source Licenses. See LICENSE.TXT for details.
   3
   4 #include "../assembly.h"
   5
   6 // _chkstk routine
   7 // This routine is windows specific
   8 // http://msdn.microsoft.com/en-us/library/ms648426.aspx
   9
  10 #ifdef __i386__
  11
  12 .text
  13 .balign 4
  14 DEFINE_COMPILERRT_FUNCTION(__chkstk_ms)
  15         push   %ecx
  16         push   %eax
  17         cmp    $0x1000,%eax
  18         lea    12(%esp),%ecx
  19         jb     1f
  20 2:
  21         sub    $0x1000,%ecx
  22         orl    $0,(%ecx)
  23         sub    $0x1000,%eax
  24         cmp    $0x1000,%eax
  25         ja     2b
  26 1:
  27         sub    %eax,%ecx
  28         orl    $0,(%ecx)
  29         pop    %eax
  30         pop    %ecx
  31         ret
  32 END_COMPILERRT_FUNCTION(__chkstk_ms)
  33
  34 #endif // __i386__