背景

上篇博客寫了如何在gem5的full system模式運行alpha的指令編譯的程序，這篇博客講述如何在gem5的full system模式運行x86指令集編譯的程序，這兩種方式非常類似。

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首先需要安裝gem5-stable，可以參考我前面的一篇博客：

http://blog.csdn.net/wyj7260/article/details/8267345

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這篇文章介紹full system ?in ?x86。

安裝過程：

下載full system需要的兩個包：

首先在安裝好gem5-stable之后，再到官網下載full system需要的包：

Full System Files : http://www.m5sim.org/dist/current/x86/x86-system.tar.bz2

Config files : http://www.m5sim.org/dist/current/x86/config-x86.tar.bz2

安裝：記我的gem5-stable安裝目錄為$GEM

a)??????~/gem5-stable$? mkdir x86Dist

b)??????將包x86-system.tar.bz2和config-x86.tar.bz2復制到x86Dist目錄下

b) ~/gem5-stable$ cd x86Dist/

c) ~/gem5-stable/x86Dist$ ?tar -xvf x86-system.tar.bz2

把exceptKeyError:

? path = [ '/dist/m5/system', '/n/poolfs/z/dist/m5/system

修改成

except KeyError:

path = [ '/dist/m5/system', ' /home/wyj2/gem5-stable/x86Dist' ]

運行(運行過程中遇到的error以及解決方法)

1、? 首先編譯gem5.opt

~/gem5-stable $ scons ./build/x86/gem5.opt

2、運行模擬的linux系統

~/gem5-stable$ ./build/X86/gem5.opt ./configs/example/fs.py

報錯如下：

gem5 Simulator System.?http://gem5.org

gem5 is copyrighted software; use the --copyright option for details.

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gem5 compiled Jul 12 2013 21:30:39

gem5 started Jul 12 2013 21:33:06

gem5 executing on arch-node3

command line: ./build/X86/gem5.opt ./configs/example/fs.py

warning: add_child('terminal'): child 'terminal' already has parent

Global frequency set at 1000000000000 ticks per second

info: No kernel set for full system simulation. Assuming you know whatyou're doing if not SPARC ISA

????? 0: rtc: Real-time clock setto Sun Jan? 1 00:00:00 2012

panic: Error opening /home/wyj/gem5-stable/x86Dist/disks/x86root.img

?@ cycle 0

[open:build/X86/dev/disk_image.cc, line 79]

Memory Usage: 225092 KBytes

Program aborted at cycle 0

Aborted (core dumped)

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解決方法：

提示不能打開x86root.img，于是我查找x86root.img

命令：~/gem5-stable$ grep -r"x86root.img" ./

得到如下：

./configs/common/Benchmarks.py:??????????? return env.get('LINUX_IMAGE',disk('x86root.img'))

如實修改Benchmarks.py, 把return env.get('LINUX_IMAGE',disk('x86root.img'))改成

return env.get('LINUX_IMAGE', disk('linux-x86.img'))

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然后執行：

~/gem5-stable$ ./build/X86/gem5.opt ./configs/example/fs.py

gem5 Simulator System.?http://gem5.org

gem5 is copyrighted software; use the --copyright option for details.

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gem5 compiled Jul? 2 201310:06:26

gem5 started Jul 13 2013 18:13:18

gem5 executing on jsi-desktop

command line: ./build/X86/gem5.opt ./configs/example/fs.py

warn: add_child('terminal'): child 'terminal' already has parent

Global frequency set at 1000000000000 ticks per second

info: No kernel set for full system simulation. Assuming you know whatyou're doing

????? 0: rtc: Real-time clock setto Sun Jan? 1 00:00:00 2012

panic: Error opening/home/wyj2/gem5-stable/x86Dist/disks/linux-bigswap2.img

?@ cycle 0

[open:build/X86/dev/disk_image.cc, line 79]

Memory Usage: 177860 KBytes

Program aborted at cycle 0

Aborted

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缺少linux-bigswap2.img文件，秩序要將alpha的full system下載的包Full System Files解壓后的linux-bigswap2.img拷貝到目錄/home/wyj2/gem5-stable/x86Dist/disks/就行。

（full system Files下載地址http://www.m5sim.org/dist/current/m5_system_2.0b3.tar.bz2解壓也可得）

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運行

~/gem5-stable$ ./build/X86/gem5.opt ./configs/example/fs.py

仍然報錯

gem5 Simulator System.? http://gem5.org

gem5 is copyrighted software; use the --copyright option for details.

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gem5 compiled Jul? 2 201310:06:26

gem5 started Jul 13 2013 18:18:48

gem5 executing on jsi-desktop

command line: ./build/X86/gem5.opt ./configs/example/fs.py

warn: add_child('terminal'): child 'terminal' already has parent

Global frequency set at 1000000000000 ticks per second

info: No kernel set for full system simulation. Assuming you know whatyou're doing

????? 0: rtc: Real-time clock setto Sun Jan? 1 00:00:00 2012

Listening for com_1 connection on port 3456

warn: Reading current count from inactive timer.

0: system.remote_gdb.listener: listening for remote gdb #0 on port 7000

fatal: No kernel to load.@ cycle 0

[initState:build/X86/arch/x86/system.cc, line 118]

Memory Usage: 177868 KBytes

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這是因為運行時需要制定kernel：

運行命令為：

./build/X86/gem5.opt ./configs/example/fs.py --kernel=x86_64-vmlinux-2.6.22.9.smp

注意：此處不用制定.smp文件的路徑，只用文件名就行

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剩下的mount文件到模擬的系統同上一篇關于alpha的full system

。

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參考鏈接：

http://www.m5sim.org/Running_M5_in_Full-System_Mode

http://novel.ict.ac.cn/qguo/pdf/gem5.pdf

http://gem5.org/dist/tutorials/hipeac2012/gem5_hipeac.pdf

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以及參考師兄的ppt

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