android - Insert method call in smali code -

-

i want add following call of method "send()" smali method:

invoke-direct {p0}, x->send()v

send() method of current class. x wildcard current class name. have 2 unresolved problems:

  1. why invoke-direct need register p0? thought parameter.

  2. do have take consideration p0 register? possible additional code makes entire app not compile if keep it? if so, how can find out register must used?

i want add method call arbitrary method. don't know method structure , can't predict register usage. therefore need know if p0 in upper code can change , under conditions.

i provide simple example emphasize intention:

let's assume have method reads contacts saved on smartphone:

.method private getcontacts()ljava/util/arraylist; .locals 12 .annotation system ldalvik/annotation/signature; value = { "()", "ljava/util/arraylist", "<", "ljava/lang/string;", ">;" } .end annotation .prologue const/4 v2, 0x0 .line 43 new-instance v7, ljava/util/arraylist; invoke-direct {v7}, ljava/util/arraylist;-><init>()v .line 44 .local v7, "contacts":ljava/util/arraylist;, "ljava/util/arraylist<ljava/lang/string;>;" invoke-virtual {p0}, lorg/puellen/contacts/mainactivity;->getcontentresolver()landroid/content/contentresolver; move-result-object v0 sget-object v1, landroid/provider/contactscontract$contacts;->content_uri:landroid/net/uri; move-object v3, v2 move-object v4, v2 move-object v5, v2 ...

i wrote parser automatically extracts code .apk file. want extend methods functionality, adding upper method call.

in case can add call @ beginning. difference appears in line 13 (see comment)

.method private getcontacts()ljava/util/arraylist; .locals 12 .annotation system ldalvik/annotation/signature; value = { "()", "ljava/util/arraylist", "<", "ljava/lang/string;", ">;" } .end annotation .prologue invoke-direct {p0}, lorg/my_package/custom_class/mainactivity;->send()v # added method call const/4 v2, 0x0 .line 43 new-instance v7, ljava/util/arraylist; invoke-direct {v7}, ljava/util/arraylist;-><init>()v .line 44 .local v7, "contacts":ljava/util/arraylist;, "ljava/util/arraylist<ljava/lang/string;>;" invoke-virtual {p0}, lorg/puellen/contacts/mainactivity;->getcontentresolver()landroid/content/contentresolver; move-result-object v0 sget-object v1, landroid/provider/contactscontract$contacts;->content_uri:landroid/net/uri; move-object v3, v2 move-object v4, v2 move-object v5, v2

until know add method call after .prologue. sure behaviour not work always. there "perfect" place add call? can use p0 in "invoke-direct" or how find out register can used?

question: can use p0 in "invoke-direct" or how find out register can used?

answer: "the first parameter non-static methods object method being invoked on." (link see blow in first comment). method not static, can use p0

now need know place method call.


Comments

Post a Comment

Popular posts from this blog

matlab - "Contour not rendered for non-finite ZData" -

-
i'm trying plot frequency characteristic equation using ezplot, matlab gives following warning, "contour not rendered non-finite zdata". have used command plot frequency equations warning , plot display empty , not change axis range well. can please help. appreciated. here's code i'm using. % transfer matrix case-i, thin rotor clear all; clc; ei = 1626; l = 0.15; m = 0.44108; = 2.178*10^-4; i_p = 2.205*10^-5; itr = 0.24; i_pr = 0.479; syms p n; f = [1 l*1i l^2/(2*ei)*1i l^3/(6*ei); 0 1 l/ei -l^2/(2*ei)*1i; 0 0 1 -l*1i; 0 0 0 l]; p = [ 1 0 0 0; 0 1 0 0; 0 -it*p^2+i_p*n*p 1 0; -m*p^2 0 0 1]; p_r = [1 0 0 0; 0 1 0 0; 0 -itr*p^2+i_pr*n*p 1 0; -m*p^2 0 0 1]; = f*p*f*p*f*p*f; b = p_r*f*p*f*p*f; r = a(1,2)/a(1,4); a12_p = 0; a22_p = a(2,2)-r*a(2,4); a32_p = a(3,2)-r*a(3,4); a42_p = a(4,2)-r*a(4,4); ap(2,2) = a22_p; ap(3,2) = a32_p; ap(4,2) = a42_p; ap(4,4) = 1; c = b*ap; m = [c(3,2) c(3,4); c(4,2) c(4,...
Read more

delphi - Indy UDP Read Contents of Adata -

-
i using indy udp server read string of data. however, not know how work adata parameter. can around converting binary using bytetobin function below , convert hex using bintohex1 . feel stupid , works slow. know how can directly results without 2 conversions? thanks!! here codes: procedure tform1.idudpserver1udpread(athread: tidudplistenerthread; const adata: tidbytes; abinding: tidsockethandle); var buf: tidbytes; buffer: string; data_received: string; begin if bytestostring(adata) <> 'hello' begin buffer := hextostring('00'); setlength(buf, length(buffer)); copytidstring(buffer, buf, 0); abinding.sendto(abinding.peerip, abinding.peerport, buf); data_received := bintohex1(bytetobin(adata[1]) + bytetobin(adata[2]) + bytetobin(adata[3]) + bytetobin(adata[4]) + bytetobin(adata[5]) + bytetobin(adata[6]) + bytetobin(adata[7]) + bytetobin(adata[8]) + bytetobin(adata[9]) + bytetobin(adata[10]) + bytetobin(adata[11...
Read more

javascript - Any ideas when Firefox is likely to implement lengthAdjust and textLength? -

-
any ideas when firefox implement lengthadjust andtextlength?..... working svg application. lengthadjust , textlength working fine in chrome not working in fire fox . <svg viewbox = "0 0 500 300" version = "1.1"> <defs> <path id="s3" d="m 10,90 q 100,15 200,70" /> </defs> <g> <text font-size = "20"> <textpath xlink:href="#s3" textlength="205"> short text</textpath> </text> <use xlink:href="#s3" fill="none" stroke="black" stroke-width="1"/> </g> </svg> this implemented in firefox text elements (not textpath or tspan) in case that's ok though can move attribute text element. <svg viewbox = "0 0 500 300" version = "1.1"> <defs> ...
Read more