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.global ___chkstk_ms

#.def ___chkstk_ms;  .scl  2;  .type 32; .endef

___chkstk_ms:

       pushl  %ecx            /* save temp */

       pushl  %eax

       cmpl $0x1000, %eax     /* > 4k ?*/

       leal 12(%esp), %ecx    /* point past return addr */

       jb 2f

1:

       subl $0x1000, %ecx     /* yes, move pointer down 4k*/

       cmpl %fs:4, %ecx       /* check low stack limit    */

       jb 3f

       orl $0x0, (%ecx)       /* probe there */

       subl $0x1000, %eax     /* decrement count */

       cmpl $0x1000, %eax

       ja 1b                  /* and do it again */

2:

       subl %eax, %ecx

       orl $0x0, (%ecx) /* less than 4k, just peek here */

       popl %eax

       popl %ecx

       ret

3:

       int3                    #trap to debugger