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

   1 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   2 // See https://llvm.org/LICENSE.txt for license information.
   3 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   4
   5 #include "../assembly.h"
   6
   7 // _chkstk routine
   8 // This routine is windows specific
   9 // http://msdn.microsoft.com/en-us/library/ms648426.aspx
  10
  11 #ifdef __i386__
  12
  13 .text
  14 .balign 4
  15 DEFINE_COMPILERRT_FUNCTION(__chkstk_ms)
  16         push   %ecx
  17         push   %eax
  18         cmp    $0x1000,%eax
  19         lea    12(%esp),%ecx
  20         jb     1f
  21 2:
  22         sub    $0x1000,%ecx
  23         test   %ecx,(%ecx)
  24         sub    $0x1000,%eax
  25         cmp    $0x1000,%eax
  26         ja     2b
  27 1:
  28         sub    %eax,%ecx
  29         test   %ecx,(%ecx)
  30         pop    %eax
  31         pop    %ecx
  32         ret
  33 END_COMPILERRT_FUNCTION(__chkstk_ms)
  34
  35 #endif // __i386__