在Linux下編譯帶調試功能的Bochs
在Linux下使用Bochs參考：html
http://wangcong.org/articles/bochs.htmllinux
http://kinglaw05.blog.163.com/blog/static/59683314200911205510345/ios
首先，安裝libgtk2.0-dev，build-essential庫c++
1: sudo apt-get install libgtk2.0-dev build-essential
而後下載最新的bochs源碼，解壓ubuntu
1: sudo wget http://bochs.sourceforge.net/svn-snapshot/bochs-20140211.tar.gz
2: sudo gzip -d bochs-20140211.tar.gz
3: sudo tar -xvf bochs-20140211.tar
4: cd bobochs-20140211
配置bash
將.conf.linux修改爲下面模樣：app
1: #!/bin/sh
2: #
3: # .conf.linux
4: #
5:
6: #which_config=normal
7: which_config=plugins
8:
9: CC="gcc"
10: CXX="c++"
11: CFLAGS="-Wall -O3 -fomit-frame-pointer -pipe" # for speed
12: #CFLAGS="-Wall -g -pipe" # for development
13: CXXFLAGS="$CFLAGS"
14:
15: export CC
16: export CXX
17: export CFLAGS
18: export CXXFLAGS
19:
20:
21: case $which_config in
22:
23: normal)
24:
25: #######################################################################
26: # configuration 1 for release binary RPMs
27: # Include a few standard options, speed optimizations, X11 only.
28: #######################################################################
29: ./configure --enable-sb16 \
30: --enable-ne2000 \
31: --enable-all-optimizations \
32: --enable-cpu-level=6 \
33: --enable-x86-64 \
34: --enable-vmx=2 \
35: --enable-pci \
36: --enable-clgd54xx \
37: --enable-voodoo \
38: --enable-usb \
39: --enable-usb-ohci \
40: --enable-es1370 \
41: --enable-e1000 \
42: --enable-show-ips \
43: --enable-debugger \
44: --enable-disasm
45: ${CONFIGURE_ARGS}
46: ;;
47:
48: plugins)
49: #######################################################################
50: # configuration 2 for release binary RPMs
51: # Include plugins, every possible gui.
52: #######################################################################
53: ./configure --enable-sb16 \
54: --enable-ne2000 \
55: --enable-all-optimizations \
56: --enable-cpu-level=6 \
57: --enable-x86-64 \
58: --enable-vmx=2 \
59: --enable-pci \
60: --enable-clgd54xx \
61: --enable-voodoo \
62: --enable-usb \
63: --enable-usb-ohci \
64: --enable-usb-xhci \
65: --enable-es1370 \
66: --enable-e1000 \
67: --enable-plugins \
68: --enable-show-ips \
69: --with-all-libs \
70: --enable-debugger \
71: --enable-disasm
72: ${CONFIGURE_ARGS}
73: ;;
74:
75: esac
修改完後，執行sudo bash .conf.linux腳本進行配置svn
安裝oop
1: sudo make
2: sudo make install
到http://bochs.sourceforge.net/diskimages.html，下載一個已經配置好的img.ui
1: sudo wget http://bochs.sourceforge.net/guestos/dlxlinux4.tar.gz
2: sudo gzip -d dlxlinux4.tar.gz
3: sudo tar -xvf dlxlinux4.tar
4: cd dlxlinux4
5: bochs -q -f bochsrc.txt
就進入了調試狀態
1: daniel@ubuntu:~/linux-3.0/bochs/dlxlinux$ bochs -q -f dlxlinux.bxrc
2: ========================================================================
3: Bochs x86 Emulator 2.6.2.svn
4: Built from SVN snapshot after release 2.6.2
5: Compiled on Feb 14 2014 at 01:21:35
6: ========================================================================
7: 00000000000i[ ] LTDL_LIBRARY_PATH not set. using compile time default '/usr/local/lib/bochs/plugins'
8: 00000000000i[ ] BXSHARE not set. using compile time default '/usr/local/share/bochs'
9: 00000000000i[ ] lt_dlhandle is 0xa956340
10: 00000000000i[PLUGIN] loaded plugin libbx_unmapped.so
11: 00000000000i[ ] lt_dlhandle is 0xa9569d0
12: 00000000000i[PLUGIN] loaded plugin libbx_biosdev.so
13: 00000000000i[ ] lt_dlhandle is 0xa956fb0
14: 00000000000i[PLUGIN] loaded plugin libbx_speaker.so
15: 00000000000i[ ] lt_dlhandle is 0xa9577d8
16: 00000000000i[PLUGIN] loaded plugin libbx_extfpuirq.so
17: 00000000000i[ ] lt_dlhandle is 0xa957d28
18: 00000000000i[PLUGIN] loaded plugin libbx_parallel.so
19: 00000000000i[ ] lt_dlhandle is 0xa959160
20: 00000000000i[PLUGIN] loaded plugin libbx_serial.so
21: 00000000000i[ ] lt_dlhandle is 0xa95c400
22: 00000000000i[PLUGIN] loaded plugin libbx_gameport.so
23: 00000000000i[ ] lt_dlhandle is 0xa95c9b8
24: 00000000000i[PLUGIN] loaded plugin libbx_iodebug.so
25: 00000000000i[ ] reading configuration from dlxlinux.bxrc
26: 00000000000i[ ] lt_dlhandle is 0xa95cf28
27: 00000000000i[PLUGIN] loaded plugin libbx_x.so
28: 00000000000i[ ] installing x module as the Bochs GUI
29: 00000000000i[ ] using log file bochsout.txt
30: Next at t=0
31: (0) [0x0000fffffff0] f000:fff0 (unk. ctxt): jmpf 0xf000:e05b ; ea5be000f0
32: <bochs:1> ^C
按下Ctrl+Z能夠退出調試程序
dlxlinux內核有一個缺點，就是內核太老了，是1.3版本。
在Bochs img列表中，還有一項
Linux kernel image for x86-64 from Andi Kleen at SuSE, which can be used as a boot floppy. Here is the System.map file for it, which can be useful for debugging.
這裏只提供了一個linux內核映像，是bzImage格式，做爲floppy掛載能夠啓動內核，可是提示找不到根文件系統。所以，咱們須要本身搞定根文件系統。
不想從頭作一個根文件系統，就能夠將dlxlinux的拷貝過來用。
怎樣將root.img掛載到當前的目錄中？
由於root.img裏面包含着MBR以及第一個分區，並且第一個分區並非緊跟在MBR後面，怎麼可以知道第一個分區的位置呢？
能夠查看MBR中的分區表記錄
1: dlxlinux $ hd root.img -s 446 | head
2: 000001be 00 01 01 00 83 03 51 31
11 00 00 00 37 51 00 00
|......Q1....7Q..|
3: 000001ce 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
4: *
5: 000001fe 55 aa 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |U...............|
6: 0000020e 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
7: *
8: 000025fe 00 00 30 0a 00 00 9b 28 00 00 07 02 00 00 a6 1c |..0....(........|
9: 0000260e 00 00 b1 07 00 00 01 00 00 00 00 00 00 00 00 00 |................|
10: 0000261e 00 00 00 20 00 00 00 20 00 00 18 05 00 00 b4 7a |... ... .......z|
11: 0000262e ff 52 79 17 ff 52 1e 00 14 00 53 ef 00 00 01 00 |.Ry..R....S.....|
紅色部分分別表明第一個分區的起始扇區號爲0x00000011，扇區個數爲0x00005137。
所以， 咱們能夠用下面命令將root.img掛載起來。
1: sudo mkdir root
2: sudo mount -o loop,offset=8704 root.img ./root
其中，8704＝0x11 * 0x200
本身建立一個img，而且將一個文件系統塞進去，而且製做分區表。
http://archive09.linux.com/forums/topic/1519
http://thestarman.pcministry.com/asm/mbr/PartTables.htm
http://aneeska.com/2011/04/07/how-to-create-a-partition-in-an-image-file/
1: losetup /dev/loop0 root.img
2: mkfs.ext3 /dev/loop0
3: mount /dev/loop0 ./root
4: # copy files to ./root
5: umount ./root
6: losetup -d /dev/loop0
給img擴容
1: sudo dd if=/dev/zero of=bigroot.img bs=1024 seek=10404 count=5120
1: fdisk -u bigroot.img -c=dos
打造一個本身的根文件系統，使用指定的Linux內核文件，再加上Grub用於啓動。
參考：http://blog.csdn.net/deansrk/article/details/6661293
http://blog.chinaunix.net/uid-26207112-id-3332621.html
可是沒法進入
將linux.vdi文件做成linux.img文件，用Bochs進行調試，而且參考System.map中給出的線性地址進行斷點設置，發現有執行到/sbin/init初始化任務
1: do_execve
2: do_execve_common
3: open_execve
4: do_filp_open
5: path_openat
返回了-1（#define EPERM 1 /* Operation not permitted */）
即操做不容許錯誤。
1: static struct file *path_openat(int dfd, const char *pathname,
2: struct nameidata *nd, const struct open_flags *op, int flags)
3: {
4:
5: current->total_link_count = 0;
6: error = link_path_walk(pathname, nd);
7: if (unlikely(error))
8: goto out_filp;
9:
10: }
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