<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>/ z! E! ]( O4 l% u0 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>
) g+ r1 R) I/ a \3 W" z! 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></SPAN></P>
. M; m+ F' l& d" H9 Z$ V<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>
5 M# V! r% B( C# 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"></SPAN> </P>
' W9 N& p6 b/ S/ N- S9 j# A3 N6 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 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>' ^' q# s9 Y' t" 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></P>" w) i7 b' L- |4 X, 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">;Ex7,演示利用seh单步自跟踪 by Hume,2002</SPAN></P>
4 e" E& o! Z& R% ~) 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">;humewen@21cn.com </SPAN></P>* r1 b6 h- p8 Z) a) G7 K4 `
<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>$ r! l& S0 X# [5 Q6 O
<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/ {: u1 |' z1 Y% ]; v+ ^% B' 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">.586</SPAN></P>( g% R3 u% _! Z7 k9 B1 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">.model flat, stdcall</SPAN></P>9 }0 Z5 E) v0 S8 O
<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>- C9 }" |3 I" W# 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">include hd.h</SPAN></P>
: E4 T) C: d- l) u! C) 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">include mac.h</SPAN></P>2 a2 A4 `( ?# K9 H f7 U( O
<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>3 r* q$ ^& G& 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">singlestep_xHandler<SPAN style="mso-tab-count: 1"> </SPAN><SPAN style="mso-tab-count: 1"> </SPAN>proto C :DWORD,:DWORD,:DWORD,:DWORD</SPAN></P>
* H4 c$ |) t4 I- v+ H, 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>! s+ G \( [) 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">.data</SPAN></P>
* e! \2 D$ v& G0 k( R! 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">count<SPAN style="mso-spacerun: yes"> </SPAN>dd<SPAN style="mso-spacerun: yes"> </SPAN>0</SPAN></P>/ f6 Y) @$ g( O+ H/ M5 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">Msg0<SPAN style="mso-spacerun: yes"> </SPAN>db<SPAN style="mso-spacerun: yes"> </SPAN>"Eax=="</SPAN></P>9 d7 Z) r; b r4 C% j
<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>
d1 R* [2 R! I" G: C0 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></P>/ d: L" @0 K- c5 ^" [1 N) 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">.CODE</SPAN></P>2 y( S% t* ]4 G: ^6 u( C8 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">_Start:</SPAN></P>( G' E! \1 {+ C V% _: m' O
<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>
% M; D8 z" ^4 C8 E; c' w' S; 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>4 l$ q5 J6 S V% 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>push<SPAN style="mso-spacerun: yes"> </SPAN>fs:[0]</SPAN></P>
$ }5 n! i$ k: o1 g4 E& v+ y0 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>mov<SPAN style="mso-spacerun: yes"> </SPAN>fs:[0],esp</SPAN></P>
8 }: Y6 z2 ^2 |. ^( `+ [<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>
2 @ }0 e, |# @- j+ Q0 O3 P! 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"><SPAN style="mso-spacerun: yes"> </SPAN>xor<SPAN style="mso-spacerun: yes"> </SPAN>eax,eax</SPAN></P>6 d; j3 t- I; ~- d1 _9 m0 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>pushfd</SPAN></P>
7 P0 p( J/ z- o( B6 x3 `<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>
4 u3 S7 Y5 E2 H* m/ o0 j6 r4 w% 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>! O1 t5 h: D 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>popfd<SPAN style="mso-spacerun: yes"> </SPAN>;置TF标志进入单步状态</SPAN></P>
3 B7 ?$ {3 p$ X4 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> </P>, K, E: L/ I. _8 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>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> Z# U, j# r# m8 _9 L4 v3 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>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>4 U4 u) R( C- a" `. N7 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><SPAN style="mso-spacerun: yes"> </SPAN>; 单步执行</SPAN></P>
p& b, F. U* Z0 o( 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>inc<SPAN style="mso-spacerun: yes"> </SPAN>eax<SPAN style="mso-spacerun: yes"> </SPAN>; normal eax==3,but infact eax==7</SPAN></P>
6 F; h5 x. S7 `6 `9 o<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>
* q5 T! {- ^5 s) {$ 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>popfd</SPAN></P>
# I% I% m& V# k! o+ `3 a4 ]<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>2 H C$ Y) ]$ 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>add<SPAN style="mso-spacerun: yes"> </SPAN>eax,30h<SPAN style="mso-spacerun: yes"> </SPAN>;convert to ASCIIZ</SPAN></P>7 t0 R; _7 D, o$ F* Y. 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>mov<SPAN style="mso-spacerun: yes"> </SPAN>DispEAX,eax</SPAN></P>
1 O+ z8 Q! B# w( h+ \# X/ J! [<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>$ F- Z5 Z1 O7 @/ `. j
<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>2 A, Y6 }7 G7 y9 u7 k) 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>pop<SPAN style="mso-spacerun: yes"> </SPAN>fs:[0]</SPAN></P>
' C# ?& c9 [' 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"><SPAN style="mso-spacerun: yes"> </SPAN>add<SPAN style="mso-spacerun: yes"> </SPAN>esp,4</SPAN></P>
b/ X1 o5 j) S9 K4 O: L9 H9 `<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>
7 \1 }, S) @( n8 t: h% J9 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>
' t! s, q8 K. b# W4 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">singlestep_xHandler PROC C pExcept:DWORD,pFrame:DWORD,pContext:DWORD,pDispatch:DWORD</SPAN></P>
: d) f2 G3 E4 t0 | ?7 X0 i% \0 [<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>
) G4 `; N' W4 H+ 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>edi:ptr CONTEXT</SPAN></P>' L% S/ o p4 f) f. V; x+ V8 {
<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>
. \% \; Y6 Q9 C4 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>3 L* W1 {, H0 `+ 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>mov<SPAN style="mso-spacerun: yes"> </SPAN>esi,pExcept</SPAN></P>
3 p$ B+ m" l+ J W- p. i0 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"><SPAN style="mso-spacerun: yes"> </SPAN>mov<SPAN style="mso-spacerun: yes"> </SPAN>edi,pContext<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>
* T! q/ c1 Z6 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></SPAN></P>; W: S8 f" @3 z7 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>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>
' {2 X; @+ F# O* ~* `; s0 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>jnz<SPAN style="mso-spacerun: yes"> </SPAN>@f<SPAN style="mso-spacerun: yes"> </SPAN><SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>! s/ S% P8 W$ F5 X9 \
<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>
% y) O2 A. m0 T0 @ c+ 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>jnz<SPAN style="mso-spacerun: yes"> </SPAN>@f</SPAN></P>- I/ i6 I o# B& t$ t2 Y. 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"><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>
$ J) M+ X& S6 Y k1 J<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>
w/ K7 ]" G1 I5 ^; R0 x& 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> </P># I5 P; S N: f# X; {6 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>inc<SPAN style="mso-spacerun: yes"> </SPAN>[edi].regEax </SPAN></P>6 y; @ h5 A1 ?# \
<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>- p; \8 i5 n( \, j
<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>
/ G4 x% b2 T& p* i( N5 Q: o<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>
+ r# {) x6 Y' Z3 _7 ^) 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>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>
+ @0 K" S! m- 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>;每单步中断一次,eax加1</SPAN></P>
' K" H9 \6 q1 O+ H1 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>;所以eax最后不等于3,而是</SPAN></P>8 U% v3 ?+ S# j. R' d2 O
<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>
) ~0 j. J4 H. \/ 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">@finish_singlestep:<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>3 ~! F0 J- p: P* m3 ]% A" 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 style="mso-spacerun: yes"> </SPAN></SPAN></P>
9 I6 V, Y" ?+ ]3 d- W: t& W+ A% \8 @4 J<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>" ` a" O" }# t8 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>popad<SPAN style="mso-spacerun: yes"> </SPAN>;研究一下pushad指令就明白了</SPAN></P>
9 Z! c+ |& j& x# ?0 D; W2 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>ret</SPAN></P>) k1 j, B4 |& r5 d2 ] 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></P>
4 e, e9 z0 h1 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>mov<SPAN style="mso-spacerun: yes"> </SPAN>dword ptr[esp+7*4],1<SPAN style="mso-spacerun: yes"> </SPAN>;eax==1</SPAN></P>+ k& O/ v0 u/ ~. h2 {6 K: 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>popad<SPAN style="mso-spacerun: yes"> </SPAN></SPAN></P>" {6 x, [" V. {* I7 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>ret</SPAN></P># L! X. D$ T# U1 j
<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>/ Z8 }7 h6 T9 S$ H) ~* 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">singlestep_xHandler ENDP</SPAN></P>
+ J3 W3 ^# I! e* E1 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></P>1 o$ U8 d. L1 ^1 a6 `# e3 z, U6 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">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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