Fingerprint 추적 방법

Android 동작중에 달빅이 리셋되는 경우가 있다.

이 경우 fingerprint 메세지가 나오는데 이것을 분석하는 방법입니다.

우선 fingerprint가 저장된 로그를 저장해 둔다.

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07-14 17:00:05.909: INFO/DEBUG(1198): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

07-14 17:00:05.909: INFO/DEBUG(1198): Build fingerprint: 'XXXXX/XXXX/XXXXX/8x50:2.1-update1/ERE27/eng.xxxxx.20100712.092719:userdebug/test-keys'

07-14 17:00:05.909: INFO/DEBUG(1198): pid: 1354, tid: 2191  >>> system_server <<<

07-14 17:00:05.909: INFO/DEBUG(1198): signal 11 (SIGSEGV), fault addr 00000000

07-14 17:00:05.909: INFO/DEBUG(1198):  r0 00000001  r1 00000007  r2 00000002  r3 0069b920

07-14 17:00:05.909: INFO/DEBUG(1198):  r4 007061b0  r5 00000000  r6 00000001  r7 6d07bb88

07-14 17:00:05.909: INFO/DEBUG(1198):  r8 00100000  r9 6d3647e1  10 38361000  fp 00000000

07-14 17:00:05.909: INFO/DEBUG(1198):  ip 6d07b05c  sp 38460df0  lr 6d035c57  pc 6d035c58  cpsr 20000030

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1. 우선 컴파일 된 경로의 root를 간다. [cmd 창 연다]

 보통 아래 처럼 경로가 있는데 android 상위 폴더에서 처리한다.

Project -

    android

    modem

2. 저장시킬 로그를 project 폴더에 복사한다.

3. "parse_mapfile.pl" 파일을 생성하고 아래 내용을 저정한다.

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##########################################################

#

#!/usr/bin/perl

#

# Searches android logfiles for android stack dumps and 

# generates a calltrace.

#

# Syntax : perl ./parse_mapfile.pl  

# 

# is option and is not needed if calling script 

#  from /build folder e.g.

#

#  For emulator builds

#  perl ./scripts/parse_mapfile.pl generic

#  

#  For dream builds

#  perl ./scripts/parse_mapfile.pl dream

#

#

##########################################################

use strict;

sub findsym;

my $mydroid_root = "../mydroid"; #default

my $logfile = $ARGV[0];

my $target = "generic"; # default emulator

if ($ARGV[1])

{

   $target = $ARGV[1];

}

if ($ARGV[2])

{

   $mydroid_root = $ARGV[2];

}

print("target=$target\n");

print("mydroid_root=$mydroid_root\n");

my $nm="$mydroid_root/prebuilt/linux-x86/toolchain/arm-eabi-4.2.1/arm-eabi/bin/nm";

my $sympath = "$mydroid_root/out/target/product/$target/symbols";

my $sympath_alt = "$mydroid_root/out/target/product/$target/";

my $parsing_syms = 0;

my $pos;

my $i;

open LOGFILE, "<", $logfile or die $!;

# Search for stack dump

while () 

{

    my($logline) = $_;

    my $search_start="Build fingerprint:";

    my $search_stop="stack:";

    chomp($logline);

        

    $pos++;

    if($logline =~ m/$search_start/) 

    {

        print("#######################################################################################\n");

        print("# Found stackdump @ line $pos....generating calltrace\n\n");

        $parsing_syms = 1;

        $i = 0;

    }

    if ($parsing_syms)

    {

        if($logline =~ m/(#.*)pc (.*) (.*)/g)

        {       

            findsym($2, $3);

        }

    }

    if($logline =~ m/$search_stop/) 

    {

        $parsing_syms = 0;      

        print("\n#\n#######################################################################################\n"); 

    }

}

sub findsym

{

    my $mapfile = "syms.map";

    my $hprev_sym;

    my $hprev_addr = 0;

    my $hcur_addr;

    my $hcur_sym = 0; 

    my $binary=@_[1];

    my $mappath;

    my $symbol = @_[0];

    my $cmd;

    my $prev_sz;

    my @line1;

    my $cur;

    my $offset;

    my $pos = 0;

    my $symfile;

    

    chomp($nm);

    chomp($binary);

    # remove and CR/LF

    $binary =~ s/\r|\n//g;

    $symfile = "$sympath$binary";

    if (! -e $symfile)

    {

        # try alternate location

        $symfile = "$sympath_alt$binary";

        #print("Couldn't find $binary, try alternate path\n");

    }

    if (! -e $symfile)

    {

        print("could not find binary, exit");

        exit 1;

    }

    

    my $my_cmd="$nm $symfile | sort > $mapfile";

    system($my_cmd);

    open MAPFILE, "<", $mapfile or die $!;

    while ()   

    {

        my($line) = $_;

        chomp($line);

        # split line on any nbr spaces

        @line1 = split(/ +/, $line);

        # search all code segments

        {

            $hcur_addr = $line1[0];

            $hcur_sym = $line1[2];

            $cur = hex($symbol);

            $a = hex $hprev_addr;

            $b = hex $hcur_addr;

            $prev_sz = $b-$a;

            #print "lr=$cur, a=$a(0x$hprev_addr), b=$b(0x$hcur_addr)\n";

            if (($cur >= $a) && ($cur <= $b))

            { 

                $offset = $cur-$a;

                print sprintf("%25s @ 0x%08x (fn pos %04d/%04d) [0x%08x] $binary\n", 

                           $hprev_sym, $a, $offset, $prev_sz, $cur);

                $i++;

            }

        }

        $hprev_sym = $hcur_sym;

        $hprev_addr = $hcur_addr;

    }    

    close MAPFILE;

    

    my $my_cmd="rm $mapfile";

    system($my_cmd);

}

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4. cmd창에서 아래의 형식으로 명령을 수행한다.

perl parse_mapfile.pl

만약 모델 명 XXTT1, android 폴더명이 "android", fingerprint로그가 저장된 파일명이

"log.log"라면 아래와 같이 해준다.

perl parse_mapfile.pl Log.log XXTT1 android

 

5. 위와 같이 실행후 나온 결과를 분석한다. call stack이 찍힌다.

수행 결과 => 숫자들이 알아볼 수 있도록 변경된 것을 확인 할 수 있습니다.

#######################################################################################

# Found stackdump @ line 161....generating calltrace

             attachThread @ 0x00035bbc (fn pos 0156/0184) [0x00035c58] /system/lib/libdvm.so

      AttachCurrentThread @ 0x00035c80 (fn pos 0004/0012) [0x00035c84] /system/lib/libdvm.so

_ZN8broadcomL19handleTestModeEventEitP11tBTL_PARAMS @ 0x0005c698 (fn pos 0034/0364) [0x0005c6ba] /system/lib/libandroid_runtime.so

btl_ifc_notify_local_event @ 0x000641ac (fn pos 0040/0108) [0x000641d4] /system/lib/libandroid_runtime.so

 ctrl_socket_disconnected @ 0x00064560 (fn pos 0106/0160) [0x000645ca] /system/lib/libandroid_runtime.so

        process_ctrl_data @ 0x00064684 (fn pos 0078/0248) [0x000646d2] /system/lib/libandroid_runtime.so

         monitor_ctrl_fds @ 0x0006477c (fn pos 0010/0024) [0x00064786] /system/lib/libandroid_runtime.so

       main_client_thread @ 0x000647e0 (fn pos 0226/0324) [0x000648c2] /system/lib/libandroid_runtime.so

           __thread_entry @ 0x0000fd70 (fn pos 0048/0060) [0x0000fda0] /system/lib/libc.so

           pthread_create @ 0x0000f7b4 (fn pos 0188/0612) [0x0000f870] /system/lib/libc.so

#

#######################################################################################

[출처] [Android 디버깅] Fingerprint 추적 방법|작성자 충전중

출처 : http://blog.naver.com/PostView.nhn?blogId=kkamci25&logNo=10098930924&viewDate=&currentPage=1&listtype=0