Andes Workshop

It is currently Fri Mar 29, 2024 12:56 am

All times are UTC + 8 hours [ DST ]




Post new topic Reply to topic  [ 1 post ] 
Author Message
 Post subject: bin檔與elf檔的關係(如何知道bin檔的內容)
PostPosted: Fri Apr 20, 2012 6:17 pm 
Offline
User avatar

Joined: Fri Mar 04, 2011 9:36 pm
Posts: 500
Readelf有section表
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .nds32_vector PROGBITS 00000000 001000 000100 00 AX 0 0 16
[ 2] .nds32_nmih PROGBITS 00000100 001100 000004 00 A 0 0 4
[ 3] .nds32_wrh PROGBITS 00000104 001104 000004 00 A 0 0 4
[ 4] .nds32_jmptbl PROGBITS 00000108 001108 000040 00 A 0 0 4
[ 5] .nds32_isr PROGBITS 00000148 001148 00017c 00 AX 0 0 4
[ 6] .text PROGBITS 000002c4 0012c4 000ca0 00 AX 0 0 4
[ 7] .rodata PROGBITS 00000f64 001f64 000244 00 A 0 0 4
[ 8] .sdata_w PROGBITS 000011a8 0021a8 000004 00 WA 0 0 4
[ 9] .sbss_w NOBITS 000011ac 0021ac 000028 00 WA 0 0 4
[10] .bss NOBITS 000011d8 0021ac 000008 00 WA 0 0 8
[11] .comment PROGBITS 00000000 0021ac 000096 00 0 0 1

其中Flga標示A的都是佔空間的。
這些標示A的部份,只有sbss_w及bss不在bin檔裡,其他的全部放在bin檔裡。

例如
.nds32_vector,它的file offset為0x1000,所以elf檔裡的0x1000為.nds32_vector的起點,

如下圖:

Attachment:
p1.gif
p1.gif [ 20.43 KiB | Viewed 8233 times ]


然後bin檔裡,它是最前面的,所以bin檔裡是由0x0開始。
Attachment:
p2.gif
p2.gif [ 19.2 KiB | Viewed 8233 times ]


Attachment:
example.7z [12.99 KiB]
Downloaded 1064 times


1. elf中.nds32_vector的offset為什麼是1000?這個offset值是在哪里設置的呢?
Ans: elf檔的0x0~0x1000是檔頭,記錄本elf檔之資訊。
這個offset是自動產生的。
2. binary中offset在0x1000之前的資料是什麼呢?
Ans: binary中..0~0x100是.nds32_vector
0x100~0x104 是.nds32_nmih..依此類推


Top
 Profile Send private message E-mail  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC + 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 13 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group