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548 serge 1 
;*****************************************************************************
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;*
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;*                            Open Watcom Project
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;*
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;*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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;*
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;*  ========================================================================
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;*
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;*    This file contains Original Code and/or Modifications of Original
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;*    Code as defined in and that are subject to the Sybase Open Watcom
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;*    Public License version 1.0 (the 'License'). You may not use this file
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;*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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;*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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;*    provided with the Original Code and Modifications, and is also
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;*    available at www.sybase.com/developer/opensource.
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;*
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;*    The Original Code and all software distributed under the License are
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;*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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;*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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;*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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;*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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;*    NON-INFRINGEMENT. Please see the License for the specific language
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;*    governing rights and limitations under the License.
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;*
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;*  ========================================================================
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;*
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;* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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;*               DESCRIBE IT HERE!
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;*
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;*****************************************************************************
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include mdef.inc
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include struct.inc
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include xinit.inc
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include exitwmsg.inc
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        modstart        stk
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        datasegment
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        extrn   "C",_STACKLOW : dword
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msg     db      "Stack Overflow!", 0dh, 0ah, 0
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        enddata
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        xinit   _init_stk,DEF_PRIORITY
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        assume  ds:DGROUP
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        defp    _init_stk
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        ret                             ; return
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        endproc _init_stk
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        xdefp   __CHK
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        defpe   __CHK                   ; new style stack check
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        xchg    eax,4[esp]              ; get parm in eax
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        call    __STK                   ; call stack checker
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        mov     eax,4[esp]              ; restore eax
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        ret     4
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        endproc __CHK
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        xdefp   __STK
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        defpe   __STK
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        push    eax                     ; save parm for __GRO routine
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        _guess                          ; guess: no overflow
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          cmp   eax,esp                 ; - quit if user asking for too much
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          _quif ae                      ; - ...
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          sub   eax,esp                 ; - calculate new low point
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          neg   eax                     ; - calc what new SP would be
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          cmp   eax,[_STACKLOW]         ; - quit if too much
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          _quif   be                    ; - ...
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          call  __GRO                   ; - return
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          ret
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        _endguess                       ; endguess
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__STKOVERFLOW:
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        xdefp   "C",__STKOVERFLOW
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        pop     eax                     ; pop the stack
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ifdef __STACK__
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        push    1                       ; ...
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        push    offset msg              ; print the error message
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else
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        mov     eax,offset msg          ; print the error message
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        mov     edx,1                   ; ...
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endif
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        call    __fatal_runtime_error   ; ...
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        endproc __STK
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        xdefp   __GRO
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        defpe   __GRO                   ; dummy function to resolve symbol
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        push    eax                     ; save regs
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        push    ebx                     ; ...
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        mov     eax,12[esp]             ; get size to grow by
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        mov     ebx,-4                  ; initialiaze index
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lup:                                    ; do {
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        mov     [esp+ebx],ebx           ; - touch that stack page
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        sub     ebx,1000H               ; - decrement by 4k
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        sub     eax,1000H               ; - decrement by 4k
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        jg      lup                     ; } while stack left to go
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        pop     ebx                     ; restore regs
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        pop     eax                     ; ...
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        ret     4                       ; return to caller
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        endproc __GRO
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        xdefp   __alloca_probe
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        ; on entry eax is size of stack to grow
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        ; on exit esp has been advanced to new size
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        defpe   __alloca_probe          ; ms compatible function
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        push    eax                     ; size parm to __GRO
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        call    __GRO
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        push    eax                     ; save size
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        lea     eax,8[esp]              ; get esp value to adjust
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        sub     eax,[esp]               ; carve off piece of stack
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        xchg    eax,esp                 ; set new esp
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        mov     eax,4[eax]              ; snag return address
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        jmp     eax                     ; return to caller
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        endproc __alloca_probe
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        endmod
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        end