145 lines
3.7 KiB
NASM
145 lines
3.7 KiB
NASM
;***
|
|
;setjmp3.asm
|
|
;
|
|
; Copyright (C) 1994-2001, Microsoft Corporation. All rights reserved.
|
|
;
|
|
;Purpose:
|
|
; Contains setjmp(), longjmp() & raisex() routines;
|
|
; split from exsup.asm for granularity purposes.
|
|
;
|
|
;Notes:
|
|
;
|
|
;Revision History:
|
|
; 01-12-94 PML Split from setjmp.asm, added C9.0 generic EH
|
|
; callback for unwind.
|
|
; 02-10-94 GJF -1 is the end-of-exception-handler chain marker, not 0.
|
|
; 01-11-95 SKS Remove MASM 5.X support
|
|
;
|
|
;*******************************************************************************
|
|
|
|
;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.inc
|
|
include exsup.inc
|
|
.list
|
|
|
|
assumes DS,DATA
|
|
assumes FS,DATA
|
|
|
|
BeginCODE
|
|
|
|
; Following symbol defined in exsup.asm
|
|
extrn __except_list:near
|
|
|
|
; int
|
|
; _setjmp3 (
|
|
; OUT jmp_buf env,
|
|
; int count,
|
|
; ...)
|
|
;
|
|
; Routine Description:
|
|
;
|
|
; (New) 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. If setjmp is
|
|
; called from a function using any form of exception handling, then
|
|
; additional data is also saved allowing some form of local unwind
|
|
; at longjmp time to restore the proper exception handling state.
|
|
;
|
|
; Arguments:
|
|
;
|
|
; env - Address of the buffer for storing the state information
|
|
; count - count of additional DWORDs of information. Zero if setjmp
|
|
; not called from a function with any form of EH.
|
|
; ... Additional data pushed by the setjmp intrinsic if called
|
|
; from a function with any form of EH. The first DWORD is
|
|
; a function ptr which will be called at longjmp time to do
|
|
; the local unwind. The second DWORD is the try level to be
|
|
; restored (if applicable). Any further data is saved in the
|
|
; generic data array in the jmp_buf for use by the local
|
|
; unwind function.
|
|
;
|
|
; Return Value:
|
|
;
|
|
; A value of zero is returned.
|
|
|
|
public __setjmp3
|
|
__setjmp3 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 dword ptr [edx.version_cookie], JMPBUF_COOKIE
|
|
mov dword ptr [edx.unwind_func], 0
|
|
|
|
mov eax, dword ptr fs:__except_list
|
|
mov [edx.saved_xregistration], eax
|
|
|
|
cmp eax, -1 ; -1 means no higher-level handler
|
|
jnz short _s3_get_count
|
|
mov dword ptr [edx.saved_trylevel], -1 ;something invalid
|
|
jmp short _s3_done
|
|
|
|
_s3_get_count:
|
|
mov ecx, [esp+8] ; count of additional data
|
|
or ecx, ecx
|
|
jz short _s3_default_trylevel
|
|
|
|
mov eax, [esp+12] ; func to do local unwind at longjmp
|
|
mov [edx.unwind_func], eax
|
|
dec ecx
|
|
jnz _s3_save_trylevel
|
|
|
|
; Not called from a function with any form of EH, or no trylevel
|
|
; passed. Save the TryLevel from the topmost EH node anyway,
|
|
; assuming a C8.0 SEH node. If we're linked to an obsolete CRTDLL
|
|
; and call the old longjmp, then we'll still do the right thing.
|
|
_s3_default_trylevel:
|
|
mov eax, [eax + C8_TRYLEVEL]
|
|
mov [edx.saved_trylevel], eax
|
|
jmp short _s3_done
|
|
|
|
_s3_save_trylevel:
|
|
mov eax, [esp+16] ; try level to unwind to
|
|
mov [edx.saved_trylevel], eax
|
|
dec ecx
|
|
jz short _s3_done
|
|
|
|
push esi
|
|
push edi
|
|
lea esi, [esp+20+8]
|
|
lea edi, [edx.unwind_data]
|
|
cmp ecx, 6 ; save up to 6 more DWORDs in jmp_buf
|
|
jbe _s3_save_data
|
|
mov ecx, 6
|
|
|
|
_s3_save_data:
|
|
rep movsd
|
|
pop edi
|
|
pop esi
|
|
|
|
_s3_done:
|
|
sub eax, eax
|
|
ret
|
|
__setjmp3 ENDP
|
|
|
|
EndCODE
|
|
END
|