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|
;***
;setjmp.asm
;
; Copyright (C) 1993 - 1994 Microsoft Corporation. All rights reserved.
;
;Purpose:
; Contains setjmp() & raisex() routines;
; split from exsup.asm for granularity purposes.
;
;Notes:
;
;Revision History:
; 04-13-93 JWM Module created.
; 10-14-93 GJF Merged in NT verson.
; 01-12-94 PML Added C9.0 generic EH callback for unwind. Split
; into setjmp.asm, setjmp3.asm, and longjmp.asm.
; 02-10-94 GJF -1 is the end-of-exception-handler chain marker, not
; 0.
;
;*******************************************************************************
;hnt = -D_WIN32_ -Dsmall32 -Dflat32 -Mx $this;
;Define small32 and flat32 since these are not defined in the NT build process
small32 equ 1
flat32 equ 1
.xlist
include pversion.inc
?DFDATA = 1
?NODATA = 1
include cmacros.mas
include exsup.inc
.list
assumes DS,DATA
assumes FS,DATA
BeginCODE
if @Version LT 600
;this needs to go here to work around a masm5 bug. (emits wrong fixup)
assumes CS,FLAT
endif
; Following symbol defined in exsup.asm
extrn __except_list:near
; int
; _setjmp (
; OUT jmp_buf env)
;
; Routine Description:
;
; (Old) implementation of setjmp intrinsic. Saves the current
; nonvolatile register state in the specified jump buffer and returns
; a function value of zero.
;
; Saves the callee-save registers, stack pointer and return address.
; Also saves the exception registration list head.
;
; This code is only present for old apps that link to the DLL runtimes,
; or old object files compiles with C8.0. It intentionally duplicates
; the old setjmp bugs, blindly assuming that the topmost EH node is a
; C8.0 SEH node.
;
; Arguments:
;
; env - Address of the buffer for storing the state information
;
; Return Value:
;
; A value of zero is returned.
public __setjmp
__setjmp PROC NEAR
mov edx, [esp+4]
mov [edx.saved_ebp], ebp ; old bp and the rest
mov [edx.saved_ebx], ebx
mov [edx.saved_edi], edi
mov [edx.saved_esi], esi
mov [edx.saved_esp], esp
mov eax, [esp] ; return address
mov [edx.saved_return], eax
mov eax, dword ptr fs:__except_list
mov [edx.saved_xregistration], eax
cmp eax, -1 ; -1 means no higher-level handler
jnz short _sj_save_trylevel
mov dword ptr [edx.saved_trylevel], -1 ;something invalid
jmp short _sj_done
_sj_save_trylevel:
mov eax, [eax + C8_TRYLEVEL]
mov [edx.saved_trylevel], eax
_sj_done:
sub eax, eax
ret
__setjmp ENDP
; void
; raisex (
; IN PEXCEPTION_RECORD pxr)
;
; Routine Description:
;
; Unknown. This seems to duplicate the RaiseException API (sort of),
; but I'm not sure what it's doing here. It's not documented, but
; it's in the reserved ANSI namespace. Here it stays, in case someone
; really counts on it.
;
; Arguments:
;
; pxr - Pointer to EXCEPTION_RECORD buffer
;
; Return Value:
;
; None.
cProc raisex,<C,PUBLIC>
parmDP pxr
cBegin
pushfd
pushad
mov esi, dword ptr pxr
mov ebx, dword ptr fs:__except_list
_r_top:
or ebx, ebx
je short _r_error
push ebx ;pass address of the registration record
push esi ;pass the exception record
call [ebx.handler] ;execute language handler for this proc
add esp, 8
cmp eax, DISPOSITION_DISMISS
je short _r_dismiss
cmp eax, DISPOSITION_CONTINUE_SEARCH
jne short _r_error
mov ebx, [ebx.prev]
jmp short _r_top
_r_error:
;assert(UNREACHED); exit(-1);
_r_dismiss:
popad
popfd
cEnd
EndCODE
END
|
