gcc/config/i386/cygwin.asm

   1 /* stuff needed for libgcc on win32.  */
   2
   3 #ifdef L_chkstk
   4
   5         .global ___chkstk
   6         .global __alloca
   7 ___chkstk:
   8 __alloca:
   9         pushl  %ecx             /* save temp */
  10         movl   %esp,%ecx        /* get sp */
  11         addl   $0x8,%ecx        /* and point to return addr */
  12
  13 probe:  cmpl   $0x1000,%eax     /* > 4k ?*/
  14         jb    done
  15
  16         subl   $0x1000,%ecx             /* yes, move pointer down 4k*/
  17         orl    $0x0,(%ecx)              /* probe there */
  18         subl   $0x1000,%eax             /* decrement count */
  19         jmp    probe                    /* and do it again */
  20
  21 done:   subl   %eax,%ecx
  22         orl    $0x0,(%ecx)      /* less that 4k, just peek here */
  23
  24         movl   %esp,%eax
  25         movl   %ecx,%esp        /* decrement stack */
  26
  27         movl   (%eax),%ecx      /* recover saved temp */
  28         movl   4(%eax),%eax     /* get return address */
  29         jmp    *%eax
  30
  31
  32 #endif