2007-06-22 00:10:44 +02:00
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;*****************************************************************************
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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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2008-01-28 17:26:51 +01:00
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cmp eax,[_STACKLOW] ; - quit if too much
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2007-06-22 00:10:44 +02:00
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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
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