;*****************************************************************************
;*
;* Open Watcom Project
;*
;* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
;*
;* ========================================================================
;*
;* This file contains Original Code and/or Modifications of Original
;* Code as defined in and that are subject to the Sybase Open Watcom
;* Public License version 1.0 (the 'License'). You may not use this file
;* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
;* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
;* provided with the Original Code and Modifications, and is also
;* available at www.sybase.com/developer/opensource.
;*
;* The Original Code and all software distributed under the License are
;* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
;* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
;* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
;* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
;* NON-INFRINGEMENT. Please see the License for the specific language
;* governing rights and limitations under the License.
;*
;* ========================================================================
;*
;* Description: C library setjmp/longjmp support for 386 processors
;*
;*****************************************************************************
.386p
include mdef.inc
include struct.inc
codeptr "C",__longjmp_handler
modstart setjmp
ifdef __386__
ifdef __OS2__
xref DosUnwindException
endif
endif
ifdef __NT__
xref _RtlUnwind@16
endif
xdefp "C",_setjmp
defpe _setjmp
mov [eax],ebx ; save registers
mov 4[eax],ecx
mov 8[eax],edx
mov 12[eax],esi
mov 16[eax],edi
mov 20[eax],ebp
pop 24[eax] ; get return address
mov 28[eax],esp
push 24[eax] ; push return address back on stack
mov 32[eax],es ; save segment registers
mov 34[eax],ds
mov 36[eax],cs
mov 38[eax],fs
mov 40[eax],gs
mov 42[eax],ss
ifdef __NT__
push fs:[0] ; touched this line to cause recompile
pop 44[eax]
endif
ifdef __386__
ifdef __OS2__
push fs:[0] ; get exception chain
pop 44[eax] ; ...
endif
endif
sub eax,eax ; return 0
ret ; return
_setjmp endp
;
; There is a pragma for longjmp, saying that it aborts, therefore
; the code generator does a jmp to here as opposed to a call.
xdefp "C",longjmp
defpe longjmp
ifdef __STACK__
pop eax ; get address of jmp_buf
pop edx ; get return code
endif
; Warning, warning!
; the profiler knows about the stack frame that longjmp generates.
; do not change these 3 instructions without also changing the findLongJmpStack
; pragma in profilog.c
;
push edx
push eax ; save jmp_buf & retval in safe place
mov ebp,esp
;
; end warning
;
ifdef __NT__
push eax ; save address of jmp_buf
mov eax,[eax+44]
cmp eax,fs:[0]
jne dounwind
jmp short done_unwind
dounwind:
push 0
push offset done_unwind
push eax ; unwind up to but not including SEH active
; at setjmp()
call _RtlUnwind@16 ; trashes most registers except for ebp
done_unwind:
mov esp,ebp
mov eax,0[ebp]
mov edx,4[ebp]
endif
ifdef __386__
ifdef __OS2__
push eax ; save address of jmp_buf
push 0
;; push offset unwind
mov eax, offset unwind
push eax
mov eax,8[esp]
push 44[eax]
call DosUnwindException
unwind: add esp,12
pop eax ; restore address of jmp_buf
endif
endif
push eax ; save parm regs
push edx
mov dx,42[eax] ; setup old ss:esp as a parm
mov eax,28[eax]
call __longjmp_handler ; call handler
pop edx ; restore parm regs
pop eax
mov ss,42[eax] ; load old ss:esp
mov esp,28[eax] ; ...
push 24[eax] ; push saved eip (our return address)
or edx,edx ; if return code is 0
_if e ; then
inc edx ; - set it to 1
_endif ; endif
push edx ; save return code
mov ebx,[eax] ; load up the saved registers
mov ecx,4[eax]
mov esi,12[eax]
mov edi,16[eax]
mov ebp,20[eax]
mov dx,32[eax]
verr dx ; verify segment
_if ne
sub edx,edx
_endif
mov es,dx
mov dx,38[eax]
verr dx ; verify segment
_if ne
sub edx,edx
_endif
mov fs,dx
mov dx,40[eax]
verr dx ; verify segment
_if ne
sub edx,edx
_endif
mov gs,dx
mov edx,8[eax]
mov ds,34[eax]
pop eax ; get return code
ret ; return to point following setjmp call
longjmp endp
_TEXT ends
end