<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"></SPAN> </P>+ b9 D9 p8 \5 c
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">有时如果你对<SPAN lang=EN-US>SICE,TRW或者其他调试器显示的信息有所怀疑的话,你可以用seh显示一些信息作为简单的调试手段,当然,单步跟踪的用途远不止于此.首先回忆一下我们以前了解的单步的概念,当EFLAGS的TF位为1的话执行完某条指令后CPU将产生单步异常,与执行软指令int1类似.注意产生单步陷阱后eip已经指向下一条指令.但进入单步异常处理程序后cpu自动清除TF,以便下条指令正常执行.</SPAN></SPAN></P>) r' ^) C' ^' q) M" }
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>
, N8 }% I( a/ t. Q; _/ T<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 30pt; mso-char-indent-count: 3.0; mso-char-indent-size: 10.0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">我们要作的就是在<SPAN lang=EN-US>seh例程中继续置TF位为1,以便下一条指令执行完毕后继续产生单步陷阱实现跟踪功能,直到遇到popfd指令为止,当然你也可以随便检测其他指令或者用记数器来终止单步.</SPAN></SPAN></P>
" r5 u* m4 s3 R2 Y% e0 @<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"></SPAN> </P>4 k6 M6 Y& b+ F" z+ l
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">下面例子中如果没有单步跟踪<SPAN lang=EN-US>eax的最后结果是3,由于有了单步自跟踪,在seh处理例程中我们每中断一次要加1,所以最后的结果是7,呵呵.请看下面的例子.</SPAN></SPAN></P>7 d7 }/ f6 z" K7 g/ \( Y( Y
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">;-----------------------------------------</SPAN></P>
5 O+ r* {% @$ e) T* n<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">;Ex7,演示利用seh单步自跟踪 by Hume,2002</SPAN></P>+ B2 z$ n& Q' _7 X( N/ w
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">;humewen@21cn.com </SPAN></P>, d0 h" w( O/ ?: b- O1 ^: ~
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">;hume.longcity.net</SPAN></P>: e% N9 l! R- Q. c- e9 `
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">;-----------------------------------------</SPAN></P>8 [& y/ F% C' T9 p' Y( A& G3 a
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">.586</SPAN></P>
F& f0 g% E/ {1 V<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">.model flat, stdcall</SPAN></P>/ H. g# O$ _4 @; N
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">option casemap :none<SPAN style="mso-spacerun: yes"> </SPAN>; case sensitive</SPAN></P>
2 Y! O6 j. O& _0 T3 ~# _5 \<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">include hd.h</SPAN></P>
$ i5 b Z3 A! B7 @<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">include mac.h</SPAN></P>
! V2 P+ I9 D3 s% ^0 y9 |<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"></SPAN> </P>
, {7 m0 Y8 K1 q/ P# G" Q<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">singlestep_xHandler<SPAN style="mso-tab-count: 1"> </SPAN><SPAN style="mso-tab-count: 1"> </SPAN>proto C :DWORD,:DWORD,:DWORD,:DWORD</SPAN></P>
6 T! c, r% p7 Q6 R" c: l<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">;;--------------</SPAN></P>
1 a) c# h6 ^ u, m4 r# Y<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">.data</SPAN></P>
5 C1 Z7 q- ^0 k* M+ m1 q9 F<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">count<SPAN style="mso-spacerun: yes"> </SPAN>dd<SPAN style="mso-spacerun: yes"> </SPAN>0</SPAN></P>' E8 r: g7 ?2 ~2 g g7 S
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">Msg0<SPAN style="mso-spacerun: yes"> </SPAN>db<SPAN style="mso-spacerun: yes"> </SPAN>"Eax=="</SPAN></P>
8 M" k$ p: R) B; m) Z. X( m) G: o- Q' Z<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">DispEAX dd<SPAN style="mso-spacerun: yes"> </SPAN><SPAN style="mso-spacerun: yes"> </SPAN>0,0</SPAN></P>) o, Q5 C2 y u4 n7 c' s
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">;;-----------------------------------------</SPAN></P>* o6 W5 _& ^5 c; ?' _
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">.CODE</SPAN></P>
/ T+ h6 | ?! h4 Z<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">_Start:</SPAN></P>$ s! |3 d0 g. ^
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>assume fs:nothing</SPAN></P>1 ]! S! s, l" M- y, y, ^
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">push<SPAN style="mso-spacerun: yes"> </SPAN>offset singlestep_xHandler</SPAN></P>/ ^( t( s. d% C, G! q
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>push<SPAN style="mso-spacerun: yes"> </SPAN>fs:[0]</SPAN></P>
, k* d8 x) p% i. P3 v<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>mov<SPAN style="mso-spacerun: yes"> </SPAN>fs:[0],esp</SPAN></P>; Z o! h8 Y6 M* {0 _* j# W5 F
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>;------------------</SPAN></P>
: p/ N4 [ O1 s X6 ?<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>xor<SPAN style="mso-spacerun: yes"> </SPAN>eax,eax</SPAN></P>" N+ ^9 M- h3 S# i3 l& j7 q' `$ x: `
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>pushfd</SPAN></P>0 v- }# _! N" ^ F7 l" a- Z% N
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>pushfd</SPAN></P>
1 W& M& w# v) z4 {) W7 v* \<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN><SPAN style="mso-spacerun: yes"> </SPAN>or<SPAN style="mso-spacerun: yes"> </SPAN>dword ptr[esp],100h<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>, m( I3 v; c) x, e& Q* P0 u0 L
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>popfd<SPAN style="mso-spacerun: yes"> </SPAN>;置TF标志进入单步状态</SPAN></P>6 H, a" @0 e7 H, c# X8 L+ P8 \
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"></SPAN> </P>% [# k: X0 h3 w, X8 w
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>nop<SPAN style="mso-spacerun: yes"> </SPAN>; nop执行完后单步异常引发<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>* P% \* s2 v/ y
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>inc<SPAN style="mso-spacerun: yes"> </SPAN>eax<SPAN style="mso-spacerun: yes"> </SPAN>; eip指向,nop后面的指令,就是这里</SPAN></P>0 X, V2 H& M' T/ A! H
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>inc<SPAN style="mso-spacerun: yes"> </SPAN>eax<SPAN style="mso-spacerun: yes"> </SPAN><SPAN style="mso-spacerun: yes"> </SPAN>; 单步执行</SPAN></P>
) Q+ f, \ M6 S<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>inc<SPAN style="mso-spacerun: yes"> </SPAN>eax<SPAN style="mso-spacerun: yes"> </SPAN>; normal eax==3,but infact eax==7</SPAN></P># M0 `) g4 ] b; b+ w; l
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"></SPAN> </P>
% V# J2 ^. }$ Q" O' q) k. }<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>popfd</SPAN></P>
% o1 R3 N4 k: b# s$ d' {<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>;------------------ </SPAN></P>
3 G+ U$ B' F4 d; `! }<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>add<SPAN style="mso-spacerun: yes"> </SPAN>eax,30h<SPAN style="mso-spacerun: yes"> </SPAN>;convert to ASCIIZ</SPAN></P>
' x$ @3 p8 m* H: [' I: D: @<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>mov<SPAN style="mso-spacerun: yes"> </SPAN>DispEAX,eax</SPAN></P>
0 q' l1 m( X# S0 Q2 l* e<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>invoke<SPAN style="mso-tab-count: 1"> </SPAN>MessageBox,0,addr Msg0,ddd("The Eax equal to..."),0</SPAN></P>
$ u, R- ?+ k9 O9 o( O8 z<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>9 `! }) K5 i" p; D$ `
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>pop<SPAN style="mso-spacerun: yes"> </SPAN>fs:[0]</SPAN></P># |5 J" z3 z/ U
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>add<SPAN style="mso-spacerun: yes"> </SPAN>esp,4</SPAN></P>
8 F2 _+ L" I- d<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>invoke<SPAN style="mso-tab-count: 1"> </SPAN>ExitProcess,0</SPAN></P>* g1 y2 B, @' d- D! ~/ V4 _( F8 [
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">;-----------------------------------------</SPAN></P>
$ K' x$ }1 ^( t3 k<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">singlestep_xHandler PROC C pExcept:DWORD,pFrame:DWORD,pContext:DWORD,pDispatch:DWORD</SPAN></P>
+ H2 A5 D6 X# E* ~' N& G<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>pushad<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>: v, z" j6 J/ Z7 u9 h
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">assume<SPAN style="mso-spacerun: yes"> </SPAN>edi:ptr CONTEXT</SPAN></P>
& E( ^ L; x% P& n; ~<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">assume<SPAN style="mso-spacerun: yes"> </SPAN>esi:ptr EXCEPTION_RECORD</SPAN></P>
5 ~) z1 U# x3 m1 u& Z8 P<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>
" V) T: j0 g' S' ?<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>mov<SPAN style="mso-spacerun: yes"> </SPAN>esi,pExcept</SPAN></P>/ r: V) h4 k% ?
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>mov<SPAN style="mso-spacerun: yes"> </SPAN>edi,pContext<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>( H$ O0 p/ y2 H
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>
# h! b% C) i0 Y* T<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>test<SPAN style="mso-spacerun: yes"> </SPAN>dword ptr[esi+4],1<SPAN style="mso-spacerun: yes"> </SPAN>;Exception flags test common stuff</SPAN></P>3 o% |5 ~0 A& k
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>jnz<SPAN style="mso-spacerun: yes"> </SPAN>@f<SPAN style="mso-spacerun: yes"> </SPAN><SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>
% M) i0 w$ k# t \* M# j( I- Q<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>test<SPAN style="mso-spacerun: yes"> </SPAN>dword ptr[esi+4],6</SPAN></P>
7 {9 B& v2 J$ U) ^# w3 F; y<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>jnz<SPAN style="mso-spacerun: yes"> </SPAN>@f</SPAN></P>
3 j) g2 f% L& Y" T/ x1 |<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>cmp<SPAN style="mso-spacerun: yes"> </SPAN>dword ptr[esi],80000004h<SPAN style="mso-spacerun: yes"> </SPAN>;是否为单步异常标志</SPAN></P>
8 H# h; \0 e8 k( Q. {- m& @( u<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>jnz<SPAN style="mso-spacerun: yes"> </SPAN>@f</SPAN></P>
) g) d& r0 |; r! }- e0 F9 {<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"></SPAN> </P>
. ]' `% U1 e% [8 Z/ m( X' N' [! @<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>inc<SPAN style="mso-spacerun: yes"> </SPAN>[edi].regEax </SPAN></P>6 Y$ @* N! `& N8 m9 @& ^
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>mov<SPAN style="mso-spacerun: yes"> </SPAN>ebx,[edi].regEip</SPAN></P>. K) D, ~+ }# q* `8 N+ E1 r _
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>cmp<SPAN style="mso-spacerun: yes"> </SPAN>byte ptr[ebx],9Dh<SPAN style="mso-spacerun: yes"> </SPAN>;是否是popfd,因为目的是取消</SPAN></P>& D# y. l7 O2 l7 b4 G/ R4 N
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>jz<SPAN style="mso-spacerun: yes"> </SPAN>@finish_singlestep<SPAN style="mso-spacerun: yes"> </SPAN>;单步状态,所以这时就不应该重置TF</SPAN></P>
' n, `9 I( ^- U<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>or<SPAN style="mso-spacerun: yes"> </SPAN>[edi].regFlag,100h<SPAN style="mso-spacerun: yes"> </SPAN>;否则,重置TF<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>
/ z6 B4 S9 i. v) ]% R<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>;每单步中断一次,eax加1</SPAN></P>
- O8 z# @) p. f l2 {3 l<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>;所以eax最后不等于3,而是</SPAN></P> i9 W, C. F3 \( K
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>;中断4次后,eax==7<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>
1 s4 G* y1 r" \4 ~% c1 D; x<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">@finish_singlestep:<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P> Q$ n, S8 x/ ?) V
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>
3 [2 f4 B" g7 e& |9 w7 I<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>mov<SPAN style="mso-spacerun: yes"> </SPAN>dword ptr[esp+7*4],0<SPAN style="mso-spacerun: yes"> </SPAN>;eax==0<SPAN style="mso-spacerun: yes"> </SPAN>hehe...</SPAN></P>; q& c5 x0 i: |2 A) r: P8 N
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>popad<SPAN style="mso-spacerun: yes"> </SPAN>;研究一下pushad指令就明白了</SPAN></P>/ Y' [" l0 J E: t N, m
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>ret</SPAN></P>( |3 f- \) c8 S, f2 c% K0 {4 `
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">@@:</SPAN></P>% B2 @& \: Z* t% a9 S
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>mov<SPAN style="mso-spacerun: yes"> </SPAN>dword ptr[esp+7*4],1<SPAN style="mso-spacerun: yes"> </SPAN>;eax==1</SPAN></P>6 l+ c* k1 p# i0 x0 d
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>popad<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>
& y! V* \/ f; g5 O: Z$ T<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><SPAN style="mso-spacerun: yes"> </SPAN>ret</SPAN></P>; V* ^% V. V4 w" |
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"></SPAN> </P>! Z3 K6 J8 h% z* R. Z
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">singlestep_xHandler ENDP</SPAN></P>5 F" t8 l# T- {! U9 h" m- W2 Y8 k
<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">;-----------------------------------------</SPAN></P>
5 T, A( L! {: |& b<P class=MsoNormal style="LAYOUT-GRID-MODE: char; TEXT-INDENT: 20pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.0pt"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt">END<SPAN style="mso-tab-count: 1"> </SPAN>_Start</SPAN></P> |
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发表于 2008-9-28 16:36:42
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