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Added content in post and about
* Add xv6 debug * Fix paper links in about me page
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<meta name="description" content="My personal blog, with some boring research staff and some tricks I was fancy to. I'll try my best to make this blog fun and useful. Not just a place I complain about all happens in my Lab.
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<a class="site-title" href="/">Stop Talking, Start Doing - 停止空想，开始行动</a>
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<a class="page-link" href="/about/">About Me</a>
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<a class="page-link" href="/about/">About</a>
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</div>
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<div class="col-box post-toc hide">
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<div class="col-box-title">TOC</div>
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<div class="col-box-title">Indexes</div>
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</div>
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<title>About Me « Stop Talking, Start Doing - 停止空想，开始行动</title>
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<title>About « Stop Talking, Start Doing</title>
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<meta name="description" content="My personal blog, with some boring research staff and some tricks I was fancy to. I'll try my best to make this blog fun and useful. Not just a place I complain about all happens in my Lab.
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<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
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<header class="header">
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<div class="wrapper">
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<a class="site-title" href="/">Stop Talking, Start Doing - 停止空想，开始行动</a>
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<nav class="site-nav">
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<a class="page-link" href="/about/">About Me</a>
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<a class="page-link" href="/about/">About</a>
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<div class="post">
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<header class="post-header">
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<h1 class="post-title">About Me</h1>
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<h1 class="post-title">About</h1>
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</header>
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<article class="post-content">
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<h1 id="pengzhan-hao">Pengzhan Hao</h1>
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<p><strong>Position:</strong> Research Assistant in MOSLab<br />
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<strong>Education:</strong> Doctoral Student of SUNY at Binghamton<br />
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<strong>Email:</strong> phao3 at binghamton dot edu<br />
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<p><strong>Position:</strong> Research Assistant in MOSLab<br />
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<strong>Education:</strong> Doctoral Student of SUNY at Binghamton<br />
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<strong>Email:</strong> phao3 at binghamton dot edu<br />
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<strong>Address:</strong><br />
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MOSLab, H-6 Engineering Building<br />
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Binghamton University<br />
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@@ -86,6 +86,7 @@
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Binghamton, NY 13902</p>
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<h2 id="education">Education</h2>
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<ul>
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<li>2017.08 - Ph.D. in Computer Science, Binghamton University, NY, USA</li>
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<li>2015.08 - 2017.05 M.E in Computer Science, Binghamton University, NY, USA</li>
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@@ -93,63 +94,72 @@
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</ul>
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<h2 id="experience">Experience</h2>
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<ul>
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<li>2016.10 - <strong><em>Research Assistant</em></strong> @ Mobile and Operating System Lab, Binghamton University
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<ul>
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<li>Advised by Professor <a href="https://buzhangy.github.io/">Yifan Zhang</a></li>
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<li>Edge-based distributed deep learning
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<ul>
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<li>Implemented a system for time-sensitive, edge-based distributed neural network training scenarios with state-of-the-art performance.</li>
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<li>Applied empirical experiments to show potential opportunities in Edge-based/Mobile-based distributed neural network training.</li>
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<li>Investigated heterogeneous-aware training tasks scheduling problem.</li>
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</ul>
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</li>
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<li>Edge Computing
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<ul>
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<li>Envision edge computing’s work-flow in end device performance(latency, traffic) improving.</li>
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<li>Applied empirical experiments on different edge computing work-flow and propose/implement related solutions.</li>
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<li>Design and implement an edge-based multi-tier system for decreasing bandwidth usage from endpoint mobile device.</li>
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</ul>
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</li>
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</ul>
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</li>
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<li>2013.10 - 2014.09 <strong><em>Research Intern</em></strong> @ Advanced computer application technology engineering Research Center, Ministry of Education, China
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<ul>
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<li>Analyzed real-time routing problem and reliable algorithm design</li>
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<li>Led and developed a routing system mostly backend server program</li>
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<li>Participated in vehicle internet research</li>
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<li>Supervised by <a href="http://scse.buaa.edu.cn/buaa-css-web/toCardDetailAction.action?firstSelId=CARD_TMPL_OF_FIRST_NAVI_CN&secondSelId=CARD_TMPL_OF_ALL_TEACHER_CN&thirdSelId=&cardId=105c1bfe787-4d33-48eb-a05f-e2a6f3934216&language=0&curSelectNavId=CARD_TMPL_OF_ALL_TEACHER_CN">Juhua Pu</a>, <a href="http://scse.buaa.edu.cn/buaa-css-web/toCardDetailAction.action?firstSelId=CARD_TMPL_OF_FIRST_NAVI_CN&secondSelId=CARD_TMPL_OF_ALL_TEACHER_CN&thirdSelId=&cardId=3063cc45-7b8b-441a-86b2-3a4f59c26bd40&language=0&curSelectNavId=CARD_TMPL_OF_ALL_TEACHER_CN">Zhang Xiong</a>, Related project: <a href="https://www.microsoft.com/en-us/research/project/urban-computing/">Urban Computing</a></li>
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<li>Supervised by Juhua Pu, Zhang Xiong, Related project: Urban Computing</li>
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</ul>
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</li>
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<li>2013.10 - 2014.01 <strong><em>Research Intern</em></strong> @ Institute of Software, Chinese Academy of Sciences, China
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<ul>
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<li>Analyzed mobile OS kernel and Localized portion with C language</li>
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<li>Supervised by <a href="http://soft.buaa.edu.cn/info/1060/1307.htm">Cangzhou Yuan</a></li>
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<li>Supervised by Cangzhou Yuan</li>
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</ul>
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</li>
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</ul>
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<h2 id="research">Research</h2>
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<h2 id="research-projects">Research projects</h2>
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<ul>
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<li>Graduate
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<li><a href="https://github.com/CoderSherlock/dlib-exper">EDDL: Edge-based distributed deep learning</a></li>
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<li><a href="https://github.com/bumoslab/EdgeCourier">Edge Courier: Edge-involved Cloud file synchronization service</a> <em>Original repository(private)</em></li>
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<li>Real time routing planner <em>Original repository(private)</em>
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<ul>
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<li>Edge Computing
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<ul>
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<li>Network Performance</li>
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</ul>
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</li>
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<li>Vitrualization</li>
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</ul>
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</li>
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<li>Undergraduate
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<ul>
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<li>Urban Comuputing
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<ul>
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<li>Routing algorithm and system</li>
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<li>Real-time data processing</li>
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</ul>
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</li>
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<li>Mobile Operating System
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<ul>
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<li>Kernel Analysis</li>
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<li>Locolization</li>
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</ul>
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</li>
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<li><a href="https://github.com/CoderSherlock/Project-OSCF.git">Map preprocessing driver</a></li>
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</ul>
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</li>
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</ul>
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<h2 id="publications">Publications</h2>
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<ul>
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<li>
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<p><strong><a href="">A Case for Web Service Bandwidth Reduction on Mobile Devices with Edge-hosted Personal Services </a></strong> <br />
|
||||
Yongshu Bai, <strong>Pengzhan Hao</strong>, and Yifan Zhang <br />
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<p><strong>EDDL: A Distributed Deep Learning System for Resource-limited Edge Computing Environment.</strong>
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||||
<strong>Pengzhan Hao</strong>, and Yifan Zhang
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||||
The Sixth ACM/IEEE Symposium on Edge Computing (<strong>ACM/IEEE SEC</strong>)<br />
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San Jose, CA, USA, 2021.</p>
|
||||
</li>
|
||||
<li>
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||||
<p><strong><a href="/static/2021-10/eta-infocom18.pdf">A Case for Web Service Bandwidth Reduction on Mobile Devices with Edge-hosted Personal Services</a></strong>
|
||||
Yongshu Bai, <strong>Pengzhan Hao</strong>, and Yifan Zhang
|
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The 37th IEEE International Conference on Computer Communications (<strong>IEEE INFOCOM</strong>)<br />
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||||
Honolulu, HI, USA, 2018.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p><strong><a href="/static/2018-02/a7-hao.pdf">EdgeCourier: An Edge-hosted Personal Service for Low-bandwidth Document Synchronization in Mobile Cloud Storage Services</a></strong> <strong>[<a href="">slide</a>]</strong><br />
|
||||
<p><strong><a href="/static/2018-02/a7-hao.pdf">EdgeCourier: An Edge-hosted Personal Service for Low-bandwidth Document Synchronization in Mobile Cloud Storage Services</a></strong> <strong>[<a href="/">slide</a>]</strong><br />
|
||||
<strong>Pengzhan Hao</strong>, Yongshu Bai, Xin Zhang, and Yifan Zhang<br />
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||||
The 2nd ACM/IEEE Symposium on Edge Computing (<strong>ACM/IEEE SEC</strong>)<br />
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||||
San Jose, CA, USA, 2017.</p>
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||||
@@ -157,23 +167,27 @@ San Jose, CA, USA, 2017.</p>
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||||
<li>
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||||
<p><strong><a href="/static/2017-07/p169-zhang.pdf">Poster: Securing Device Inputs for Smartphones Using Hypervisor Based Approach</a></strong><br />
|
||||
Xin Zhang, Yongshu Bai, <strong>Pengzhan Hao</strong>, and Yifan Zhang<br />
|
||||
The 15th ACM International Conference on Mobile Systems, Applications, and Services (ACM MobiSys)<br />
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The 15th ACM International Conference on Mobile Systems, Applications, and Services (<strong>ACM MobiSys</strong>)<br />
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Niagara Falls, NY, USA, 2017.</p>
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||||
</li>
|
||||
<li>
|
||||
<p><strong><a href="/static/2017-07/p163-hao.pdf">Poster: EPS - Edge-hosted Personal Services for Mobile Users</a> [<a href="/static/2017-07/eps_poster.pdf">poster</a>]</strong><br />
|
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<strong>Pengzhan Hao</strong>, Yongshu Bai, Xin Zhang, and Yifan Zhang<br />
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||||
The 15th ACM International Conference on Mobile Systems, Applications, and Services (ACM MobiSys)<br />
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The 15th ACM International Conference on Mobile Systems, Applications, and Services (<strong>ACM MobiSys</strong>)<br />
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Niagara Falls, NY, USA, 2017.</p>
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</li>
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</ul>
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<h2 id="fun">Fun</h2>
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<h2 id="teaching">Teaching</h2>
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<ul>
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<li>My <a href="/timeline/index.html">Timeline</a></li>
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<li>Operating system (Graduate level)</li>
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<li>Operating system (Undergraduate level)</li>
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<li>Introduction to distributed system (Graduate level)</li>
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</ul>
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<h2 id="fun">Fun</h2>
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||||
</article>
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@@ -216,7 +230,7 @@ Niagara Falls, NY, USA, 2017.</p>
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</div>
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<div class="col-box post-toc hide">
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<div class="col-box-title">TOC</div>
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<div class="col-box-title">Indexes</div>
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</div>
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</div>
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</div>
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<title>Using charles proxy to monitor mobile SSL traffics « Stop Talking, Start Doing - 停止空想，开始行动</title>
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<title>Using charles proxy to monitor mobile SSL traffics « Stop Talking, Start Doing</title>
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<meta name="description" content="In this blog, I will generally talk about how to use proper tools to monitor SSL traffics of a mobile devices. Currently, I only can dealing with those SSL t...">
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<link rel="stylesheet" href="/css/main.css">
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<link rel="stylesheet" href="/css/timeline.css">
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<link rel="canonical" href="https://codersherlock.github.com//archivers/charles-is-not-a-good-tool">
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
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<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
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<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing" href="https://codersherlock.github.com//feed.xml" />
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<script>
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(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
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@@ -38,13 +38,13 @@
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<header class="header">
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<div class="wrapper">
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||||
<a class="site-title" href="/">Stop Talking, Start Doing - 停止空想，开始行动</a>
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||||
<a class="site-title" href="/">Stop Talking, Start Doing</a>
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||||
<nav class="site-nav">
|
||||
|
||||
|
||||
|
||||
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||||
<a class="page-link" href="/about/">About Me</a>
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||||
<a class="page-link" href="/about/">About</a>
|
||||
|
||||
|
||||
|
||||
@@ -160,7 +160,7 @@ You also need to save charles Root Certificate, it also contains in the same men
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</div>
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||||
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||||
<div class="col-box post-toc hide">
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||||
<div class="col-box-title">TOC</div>
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||||
<div class="col-box-title">Indexes</div>
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||||
</div>
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||||
</div>
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||||
</div>
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Generate Word Cloud Figures with Chinese-Tokenization and WordCloud python libraries « Stop Talking, Start Doing - 停止空想，开始行动</title>
|
||||
<meta name="description" content="">
|
||||
<title>Generate Word Cloud Figures with Chinese-Tokenization and WordCloud python libraries « Stop Talking, Start Doing</title>
|
||||
<meta name="description" content="Let’s generate a word cloud like this. Don’t understand the language is not a big deal.If your written language is based on latin alphabet(or other language ...">
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|
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<link rel="stylesheet" href="/css/main.css">
|
||||
<link rel="stylesheet" href="/css/timeline.css">
|
||||
<link rel="canonical" href="https://codersherlock.github.com//archivers/generate-word-cloud-with-chinese-fenci">
|
||||
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
|
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<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing" href="https://codersherlock.github.com//feed.xml" />
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<script>
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(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
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||||
<header class="header">
|
||||
<div class="wrapper">
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<a class="site-title" href="/">Stop Talking, Start Doing - 停止空想，开始行动</a>
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||||
<a class="site-title" href="/">Stop Talking, Start Doing</a>
|
||||
<nav class="site-nav">
|
||||
|
||||
|
||||
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||||
|
||||
<a class="page-link" href="/about/">About Me</a>
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||||
<a class="page-link" href="/about/">About</a>
|
||||
|
||||
|
||||
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||||
@@ -74,7 +74,11 @@
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</header>
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||||
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<article class="post-content">
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<p><img src="/static/2020-09/2020-06-28.png" height="350" /></p>
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<p>Let’s generate a word cloud like this.
|
||||
Don’t understand the language is not a big deal.
|
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If your written language is based on latin alphabet(or other language has space between words), skip tokenization.</p>
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<p><img src="/static/2020-09/2020-06-28.png" height="250" /></p>
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<h2 id="background">Background</h2>
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@@ -287,7 +291,7 @@
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</div>
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||||
<div class="col-box post-toc hide">
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||||
<div class="col-box-title">TOC</div>
|
||||
<div class="col-box-title">Indexes</div>
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||||
</div>
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</div>
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</div>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Stop Talking is the worst title of one blog « Stop Talking, Start Doing - 停止空想，开始行动</title>
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<title>Stop Talking is the worst title of one blog « Stop Talking, Start Doing</title>
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<meta name="description" content="">
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|
||||
<link rel="stylesheet" href="/css/main.css">
|
||||
<link rel="stylesheet" href="/css/timeline.css">
|
||||
<link rel="canonical" href="https://codersherlock.github.com//archivers/hello">
|
||||
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing" href="https://codersherlock.github.com//feed.xml" />
|
||||
<script>
|
||||
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
|
||||
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
|
||||
@@ -38,13 +38,13 @@
|
||||
|
||||
<header class="header">
|
||||
<div class="wrapper">
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing - 停止空想，开始行动</a>
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing</a>
|
||||
<nav class="site-nav">
|
||||
|
||||
|
||||
|
||||
|
||||
<a class="page-link" href="/about/">About Me</a>
|
||||
<a class="page-link" href="/about/">About</a>
|
||||
|
||||
|
||||
|
||||
@@ -132,7 +132,7 @@
|
||||
</div>
|
||||
|
||||
<div class="col-box post-toc hide">
|
||||
<div class="col-box-title">TOC</div>
|
||||
<div class="col-box-title">Indexes</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
@@ -6,14 +6,14 @@
|
||||
<meta http-equiv="X-UA-Compatible" content="IE=edge">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
|
||||
<title>Xv6 introduction « Stop Talking, Start Doing - 停止空想，开始行动</title>
|
||||
<meta name="description" content="I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.">
|
||||
<title>Xv6 introduction « Stop Talking, Start Doing</title>
|
||||
<meta name="description" content="In this post, you will learn a few basic concepts of xv6. Learning path will be closed coupled to first project assignment I gave when I assisted in teaching...">
|
||||
|
||||
<link rel="stylesheet" href="/css/main.css">
|
||||
<link rel="stylesheet" href="/css/timeline.css">
|
||||
<link rel="canonical" href="https://codersherlock.github.com//archivers/intro-xv6">
|
||||
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing" href="https://codersherlock.github.com//feed.xml" />
|
||||
<script>
|
||||
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
|
||||
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
|
||||
@@ -38,13 +38,13 @@
|
||||
|
||||
<header class="header">
|
||||
<div class="wrapper">
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing - 停止空想，开始行动</a>
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing</a>
|
||||
<nav class="site-nav">
|
||||
|
||||
|
||||
|
||||
|
||||
<a class="page-link" href="/about/">About Me</a>
|
||||
<a class="page-link" href="/about/">About</a>
|
||||
|
||||
|
||||
|
||||
@@ -74,9 +74,12 @@
|
||||
</header>
|
||||
|
||||
<article class="post-content">
|
||||
<p>I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.</p>
|
||||
<p>In this post, you will learn a few basic concepts of xv6. Learning path will be closed coupled to first project assignment I gave when I assisted in teaching OS classes.
|
||||
Understand system call and know how to implement a simple one will be coved as the first half.
|
||||
In the second half of this post, I will discuss a little bit more on how to debug xv6 using gdb.</p>
|
||||
|
||||
<h2 id="xv6-systemcall">Xv6 Systemcall</h2>
|
||||
|
||||
<p>To invoke a system call, we have to first define a user mode function to be the interface of the kernel instruction in file <em>user.h</em>.</p>
|
||||
|
||||
<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">void</span> <span class="nf">function</span> <span class="p">(</span><span class="kt">void</span><span class="p">);</span>
|
||||
@@ -84,15 +87,69 @@
|
||||
|
||||
<p>This interface-like function will then pass the function name, in this case function, to <em>usys.S</em>. When using user mode function in programs, <em>usys.S</em> will generate a reference to SYS_function and push system call number of this function into %eax. After that, system can know from <em>syscall.c</em> and determining whether this system call is available. We must define same name system function and add it into <em>syscall.h</em> and <em>syscall.c</em>.</p>
|
||||
|
||||
<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#define SYS_function ## // ## is the system call number
|
||||
</span><span class="p">[</span><span class="n">SYS_function</span><span class="p">]</span> <span class="n">sys_function</span> <span class="c1">// real system function name</span>
|
||||
<span class="k">extern</span> <span class="kt">int</span> <span class="nf">sys_function</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> <span class="c1">// real system function declaration</span>
|
||||
<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#define SYS_function ## // ## is the system call number
|
||||
</span><span class="p">[</span><span class="n">SYS_function</span><span class="p">]</span> <span class="n">sys_function</span> <span class="c1">// real system function name</span>
|
||||
<span class="k">extern</span> <span class="kt">int</span> <span class="nf">sys_function</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> <span class="c1">// real system function declaration</span>
|
||||
</code></pre></div></div>
|
||||
|
||||
<p>After adding these sentences to syscall files, we can implement real function in specific place where you want to make the function works well.</p>
|
||||
|
||||
<p>Sometimes, we need to pass variables among system calls. In this case, variables’ values are not necessary and even can’t be pass directly into system_function. When invoke a system call function, all variables of this system call will be pushed into current process’ stack. In file <em>syscall.c</em>, multiple functions are provided to get these variables from the process. I won’t waste time on explaining how to use these functions especially when elegant and detailed comments were written in source codes. However, I will explain concepts and how process organized and works in xv6 in future articles.</p>
|
||||
|
||||
<h2 id="debug-xv6-with-gdb">Debug xv6 with gdb</h2>
|
||||
|
||||
<p>Please make sure that you have used gdb before.
|
||||
If you never used gdb, you may write a simple 50-100 lines c code and practice how to use gdb first.</p>
|
||||
|
||||
<ul>
|
||||
<li><a href="https://sourceware.org/gdb/current/onlinedocs/gdb/">GDB Manual</a></li>
|
||||
<li><a href="https://darkdust.net/files/GDB%20Cheat%20Sheet.pdf">GDB cheatsheet (pdf)</a></li>
|
||||
</ul>
|
||||
|
||||
<p>To make sure xv6 gdb enabled, please check if <em>.gdbinit.tmpl</em> file exist.
|
||||
This file is used for generate <em>.gdbinit</em> file which you can late consider it as a configuration for gdb.</p>
|
||||
|
||||
<p>Before running the xv6 instance in QEMU, one more thing you need to know is that using gdb to debug xv6 must be attached remotely.
|
||||
This is because xv6 was running within QEMU, and emulator is virtually gapped from the host device.
|
||||
Later when you start debugging, QEMU will open a gdb server to let gdb client connect to.</p>
|
||||
|
||||
<p>Once you want to start, using following command to compile and run xv6</p>
|
||||
|
||||
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>make qemu-nox-gdb
|
||||
<span class="k">***</span> Now run <span class="s1">'gdb'</span><span class="nb">.</span>
|
||||
qemu-system-i386 <span class="nt">-nographic</span> <span class="nt">-drive</span> <span class="nv">file</span><span class="o">=</span>fs.img,index<span class="o">=</span>1,media<span class="o">=</span>disk,format<span class="o">=</span>raw <span class="nt">-drive</span> <span class="nv">file</span><span class="o">=</span>xv6.img,index<span class="o">=</span>0,media<span class="o">=</span>disk,format<span class="o">=</span>raw <span class="nt">-smp</span> 2 7
|
||||
</code></pre></div></div>
|
||||
|
||||
<p>At this moment, it feels xv6 was stuck, this is because QEMU is ready to be connected by the gdb client.
|
||||
You may use the <em>.gdbinit</em> to automatically finish this remote connection by simple typein following command in another terminal.</p>
|
||||
|
||||
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>gdb <span class="nt">-x</span> .gdbinit
|
||||
GNU gdb <span class="o">(</span>Debian 8.2.1-2+b3<span class="o">)</span> 8.2.1
|
||||
|
||||
...
|
||||
|
||||
The target architecture is assumed to be i8086
|
||||
<span class="o">[</span>f000:fff0] 0xffff0: ljmp <span class="nv">$0x3630</span>,<span class="nv">$0xf000e05b</span>
|
||||
0x0000fff0 <span class="k">in</span> ?? <span class="o">()</span>
|
||||
+ symbol-file kernel
|
||||
warning: A handler <span class="k">for </span>the OS ABI <span class="s2">"GNU/Linux"</span> is not built into this configuration
|
||||
of GDB. Attempting to <span class="k">continue </span>with the default i8086 settings.
|
||||
|
||||
<span class="o">(</span>gdb<span class="o">)</span>
|
||||
</code></pre></div></div>
|
||||
|
||||
<p>Now within this gdb client shell, type ‘c’ to continue the xv6, and you will see xv6 start execution in the first terminal.</p>
|
||||
|
||||
<p>At this moment, you may add breakpoints to your code to see if your code is correctly implemented or not.</p>
|
||||
|
||||
<p><strong>One more thing</strong>, if you open <em>.gdbinit</em> file, you’ll find that it by default connect to a localhost target.
|
||||
If you are working on some other environment that target and client were not placed in the same device, change the localhost to ip address correspondingly.
|
||||
Using ssh may connect to different physical devices under same domain name, this is because load balancer were used. To check ip address, search command <em>ip</em>.</p>
|
||||
|
||||
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>target remote localhost:28467
|
||||
<span class="c"># target remote [ip-addr]:28467</span>
|
||||
</code></pre></div></div>
|
||||
|
||||
</article>
|
||||
|
||||
|
||||
@@ -149,7 +206,7 @@
|
||||
</div>
|
||||
|
||||
<div class="col-box post-toc hide">
|
||||
<div class="col-box-title">TOC</div>
|
||||
<div class="col-box-title">Indexes</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
@@ -6,14 +6,14 @@
|
||||
<meta http-equiv="X-UA-Compatible" content="IE=edge">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
|
||||
<title>Some of my previews experiment works: 2016 « Stop Talking, Start Doing - 停止空想，开始行动</title>
|
||||
<title>Some of my previews experiment works: 2016 « Stop Talking, Start Doing</title>
|
||||
<meta name="description" content="This blog contains only some basic record of my works. For some details, I will write a unique blog just for some specific topics.">
|
||||
|
||||
<link rel="stylesheet" href="/css/main.css">
|
||||
<link rel="stylesheet" href="/css/timeline.css">
|
||||
<link rel="canonical" href="https://codersherlock.github.com//archivers/some-of-my-previews-exper-work">
|
||||
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing" href="https://codersherlock.github.com//feed.xml" />
|
||||
<script>
|
||||
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
|
||||
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
|
||||
@@ -38,13 +38,13 @@
|
||||
|
||||
<header class="header">
|
||||
<div class="wrapper">
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing - 停止空想，开始行动</a>
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing</a>
|
||||
<nav class="site-nav">
|
||||
|
||||
|
||||
|
||||
|
||||
<a class="page-link" href="/about/">About Me</a>
|
||||
<a class="page-link" href="/about/">About</a>
|
||||
|
||||
|
||||
|
||||
@@ -241,7 +241,7 @@ su
|
||||
</div>
|
||||
|
||||
<div class="col-box post-toc hide">
|
||||
<div class="col-box-title">TOC</div>
|
||||
<div class="col-box-title">Indexes</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
@@ -6,7 +6,7 @@
|
||||
<meta http-equiv="X-UA-Compatible" content="IE=edge">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
|
||||
<title>Category « Stop Talking, Start Doing - 停止空想，开始行动</title>
|
||||
<title>Category « Stop Talking, Start Doing</title>
|
||||
<meta name="description" content="My personal blog, with some boring research staff and some tricks I was fancy to. I'll try my best to make this blog fun and useful. Not just a place I complain about all happens in my Lab.
|
||||
">
|
||||
|
||||
@@ -14,7 +14,7 @@
|
||||
<link rel="stylesheet" href="/css/timeline.css">
|
||||
<link rel="canonical" href="https://codersherlock.github.com//category/">
|
||||
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
|
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<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing" href="https://codersherlock.github.com//feed.xml" />
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||||
<script>
|
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(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
|
||||
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
|
||||
@@ -39,13 +39,13 @@
|
||||
|
||||
<header class="header">
|
||||
<div class="wrapper">
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing - 停止空想，开始行动</a>
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing</a>
|
||||
<nav class="site-nav">
|
||||
|
||||
|
||||
|
||||
|
||||
<a class="page-link" href="/about/">About Me</a>
|
||||
<a class="page-link" href="/about/">About</a>
|
||||
|
||||
|
||||
|
||||
@@ -155,7 +155,7 @@
|
||||
</div>
|
||||
|
||||
<div class="col-box post-toc hide">
|
||||
<div class="col-box-title">TOC</div>
|
||||
<div class="col-box-title">Indexes</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
+1
-1
@@ -1,4 +1,4 @@
|
||||
body { margin: 0; font-family: "Times New Roman"; font-size: 15px; line-height: 1.35; }
|
||||
body { margin: 0; font-family: "Arial"; font-size: 15px; line-height: 1.35; }
|
||||
|
||||
a { text-decoration: none; color: #036; }
|
||||
|
||||
|
||||
File diff suppressed because one or more lines are too long
+69
-8
@@ -1,18 +1,22 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
|
||||
<channel>
|
||||
<title>Stop Talking, Start Doing - 停止空想，开始行动</title>
|
||||
<title>Stop Talking, Start Doing</title>
|
||||
<description>My personal blog, with some boring research staff and some tricks I was fancy to. I'll try my best to make this blog fun and useful. Not just a place I complain about all happens in my Lab.
|
||||
</description>
|
||||
<link>https://codersherlock.github.com//</link>
|
||||
<atom:link href="https://codersherlock.github.com//feed.xml" rel="self" type="application/rss+xml"/>
|
||||
<pubDate>Tue, 15 Sep 2020 22:22:06 -0400</pubDate>
|
||||
<lastBuildDate>Tue, 15 Sep 2020 22:22:06 -0400</lastBuildDate>
|
||||
<pubDate>Tue, 12 Oct 2021 18:31:37 -0400</pubDate>
|
||||
<lastBuildDate>Tue, 12 Oct 2021 18:31:37 -0400</lastBuildDate>
|
||||
<generator>Jekyll v4.1.1</generator>
|
||||
|
||||
<item>
|
||||
<title>Generate Word Cloud Figures with Chinese-Tokenization and WordCloud python libraries</title>
|
||||
<description><p><img src="/static/2020-09/2020-06-28.png" height="350" /></p>
|
||||
<description><p>Let’s generate a word cloud like this.
|
||||
Don’t understand the language is not a big deal.
|
||||
If your written language is based on latin alphabet(or other language has space between words), skip tokenization.</p>
|
||||
|
||||
<p><img src="/static/2020-09/2020-06-28.png" height="250" /></p>
|
||||
|
||||
<h2 id="background">Background</h2>
|
||||
|
||||
@@ -180,9 +184,12 @@
|
||||
|
||||
<item>
|
||||
<title>Xv6 introduction</title>
|
||||
<description><p>I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.</p>
|
||||
<description><p>In this post, you will learn a few basic concepts of xv6. Learning path will be closed coupled to first project assignment I gave when I assisted in teaching OS classes.
|
||||
Understand system call and know how to implement a simple one will be coved as the first half.
|
||||
In the second half of this post, I will discuss a little bit more on how to debug xv6 using gdb.</p>
|
||||
|
||||
<h2 id="xv6-systemcall">Xv6 Systemcall</h2>
|
||||
|
||||
<p>To invoke a system call, we have to first define a user mode function to be the interface of the kernel instruction in file <em>user.h</em>.</p>
|
||||
|
||||
<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">void</span> <span class="nf">function</span> <span class="p">(</span><span class="kt">void</span><span class="p">);</span>
|
||||
@@ -190,14 +197,68 @@
|
||||
|
||||
<p>This interface-like function will then pass the function name, in this case function, to <em>usys.S</em>. When using user mode function in programs, <em>usys.S</em> will generate a reference to SYS_function and push system call number of this function into %eax. After that, system can know from <em>syscall.c</em> and determining whether this system call is available. We must define same name system function and add it into <em>syscall.h</em> and <em>syscall.c</em>.</p>
|
||||
|
||||
<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#define SYS_function ## // ## is the system call number
|
||||
</span><span class="p">[</span><span class="n">SYS_function</span><span class="p">]</span> <span class="n">sys_function</span> <span class="c1">// real system function name</span>
|
||||
<span class="k">extern</span> <span class="kt">int</span> <span class="nf">sys_function</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> <span class="c1">// real system function declaration</span>
|
||||
<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#define SYS_function ## // ## is the system call number
|
||||
</span><span class="p">[</span><span class="n">SYS_function</span><span class="p">]</span> <span class="n">sys_function</span> <span class="c1">// real system function name</span>
|
||||
<span class="k">extern</span> <span class="kt">int</span> <span class="nf">sys_function</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> <span class="c1">// real system function declaration</span>
|
||||
</code></pre></div></div>
|
||||
|
||||
<p>After adding these sentences to syscall files, we can implement real function in specific place where you want to make the function works well.</p>
|
||||
|
||||
<p>Sometimes, we need to pass variables among system calls. In this case, variables’ values are not necessary and even can’t be pass directly into system_function. When invoke a system call function, all variables of this system call will be pushed into current process’ stack. In file <em>syscall.c</em>, multiple functions are provided to get these variables from the process. I won’t waste time on explaining how to use these functions especially when elegant and detailed comments were written in source codes. However, I will explain concepts and how process organized and works in xv6 in future articles.</p>
|
||||
|
||||
<h2 id="debug-xv6-with-gdb">Debug xv6 with gdb</h2>
|
||||
|
||||
<p>Please make sure that you have used gdb before.
|
||||
If you never used gdb, you may write a simple 50-100 lines c code and practice how to use gdb first.</p>
|
||||
|
||||
<ul>
|
||||
<li><a href="https://sourceware.org/gdb/current/onlinedocs/gdb/">GDB Manual</a></li>
|
||||
<li><a href="https://darkdust.net/files/GDB%20Cheat%20Sheet.pdf">GDB cheatsheet (pdf)</a></li>
|
||||
</ul>
|
||||
|
||||
<p>To make sure xv6 gdb enabled, please check if <em>.gdbinit.tmpl</em> file exist.
|
||||
This file is used for generate <em>.gdbinit</em> file which you can late consider it as a configuration for gdb.</p>
|
||||
|
||||
<p>Before running the xv6 instance in QEMU, one more thing you need to know is that using gdb to debug xv6 must be attached remotely.
|
||||
This is because xv6 was running within QEMU, and emulator is virtually gapped from the host device.
|
||||
Later when you start debugging, QEMU will open a gdb server to let gdb client connect to.</p>
|
||||
|
||||
<p>Once you want to start, using following command to compile and run xv6</p>
|
||||
|
||||
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>make qemu-nox-gdb
|
||||
<span class="k">***</span> Now run <span class="s1">'gdb'</span><span class="nb">.</span>
|
||||
qemu-system-i386 <span class="nt">-nographic</span> <span class="nt">-drive</span> <span class="nv">file</span><span class="o">=</span>fs.img,index<span class="o">=</span>1,media<span class="o">=</span>disk,format<span class="o">=</span>raw <span class="nt">-drive</span> <span class="nv">file</span><span class="o">=</span>xv6.img,index<span class="o">=</span>0,media<span class="o">=</span>disk,format<span class="o">=</span>raw <span class="nt">-smp</span> 2 7
|
||||
</code></pre></div></div>
|
||||
|
||||
<p>At this moment, it feels xv6 was stuck, this is because QEMU is ready to be connected by the gdb client.
|
||||
You may use the <em>.gdbinit</em> to automatically finish this remote connection by simple typein following command in another terminal.</p>
|
||||
|
||||
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>gdb <span class="nt">-x</span> .gdbinit
|
||||
GNU gdb <span class="o">(</span>Debian 8.2.1-2+b3<span class="o">)</span> 8.2.1
|
||||
|
||||
...
|
||||
|
||||
The target architecture is assumed to be i8086
|
||||
<span class="o">[</span>f000:fff0] 0xffff0: ljmp <span class="nv">$0x3630</span>,<span class="nv">$0xf000e05b</span>
|
||||
0x0000fff0 <span class="k">in</span> ?? <span class="o">()</span>
|
||||
+ symbol-file kernel
|
||||
warning: A handler <span class="k">for </span>the OS ABI <span class="s2">"GNU/Linux"</span> is not built into this configuration
|
||||
of GDB. Attempting to <span class="k">continue </span>with the default i8086 settings.
|
||||
|
||||
<span class="o">(</span>gdb<span class="o">)</span>
|
||||
</code></pre></div></div>
|
||||
|
||||
<p>Now within this gdb client shell, type ‘c’ to continue the xv6, and you will see xv6 start execution in the first terminal.</p>
|
||||
|
||||
<p>At this moment, you may add breakpoints to your code to see if your code is correctly implemented or not.</p>
|
||||
|
||||
<p><strong>One more thing</strong>, if you open <em>.gdbinit</em> file, you’ll find that it by default connect to a localhost target.
|
||||
If you are working on some other environment that target and client were not placed in the same device, change the localhost to ip address correspondingly.
|
||||
Using ssh may connect to different physical devices under same domain name, this is because load balancer were used. To check ip address, search command <em>ip</em>.</p>
|
||||
|
||||
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>target remote localhost:28467
|
||||
<span class="c"># target remote [ip-addr]:28467</span>
|
||||
</code></pre></div></div>
|
||||
</description>
|
||||
<pubDate>Fri, 28 Jul 2017 14:56:55 -0400</pubDate>
|
||||
<link>https://codersherlock.github.com//archivers/intro-xv6</link>
|
||||
|
||||
+13
-7
@@ -6,7 +6,7 @@
|
||||
<meta http-equiv="X-UA-Compatible" content="IE=edge">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
|
||||
<title>Stop Talking, Start Doing - 停止空想，开始行动</title>
|
||||
<title>Stop Talking, Start Doing</title>
|
||||
<meta name="description" content="My personal blog, with some boring research staff and some tricks I was fancy to. I'll try my best to make this blog fun and useful. Not just a place I complain about all happens in my Lab.
|
||||
">
|
||||
|
||||
@@ -14,7 +14,7 @@
|
||||
<link rel="stylesheet" href="/css/timeline.css">
|
||||
<link rel="canonical" href="https://codersherlock.github.com//">
|
||||
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing" href="https://codersherlock.github.com//feed.xml" />
|
||||
<script>
|
||||
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
|
||||
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
|
||||
@@ -39,13 +39,13 @@
|
||||
|
||||
<header class="header">
|
||||
<div class="wrapper">
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing - 停止空想，开始行动</a>
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing</a>
|
||||
<nav class="site-nav">
|
||||
|
||||
|
||||
|
||||
|
||||
<a class="page-link" href="/about/">About Me</a>
|
||||
<a class="page-link" href="/about/">About</a>
|
||||
|
||||
|
||||
|
||||
@@ -81,7 +81,11 @@
|
||||
<div class="post-meta">Sep 15, 2020</div>
|
||||
|
||||
<div class="post-excerpt">
|
||||
<p><img src="/static/2020-09/2020-06-28.png" height="350" /></p>
|
||||
<p>Let’s generate a word cloud like this.
|
||||
Don’t understand the language is not a big deal.
|
||||
If your written language is based on latin alphabet(or other language has space between words), skip tokenization.</p>
|
||||
|
||||
<p><img src="/static/2020-09/2020-06-28.png" height="250" /></p>
|
||||
|
||||
<p>
|
||||
<a class="post-link" href="/archivers/generate-word-cloud-with-chinese-fenci">Read More »</a>
|
||||
@@ -97,7 +101,9 @@
|
||||
<div class="post-meta">Jul 28, 2017</div>
|
||||
|
||||
<div class="post-excerpt">
|
||||
<p>I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.</p>
|
||||
<p>In this post, you will learn a few basic concepts of xv6. Learning path will be closed coupled to first project assignment I gave when I assisted in teaching OS classes.
|
||||
Understand system call and know how to implement a simple one will be coved as the first half.
|
||||
In the second half of this post, I will discuss a little bit more on how to debug xv6 using gdb.</p>
|
||||
|
||||
<p>
|
||||
<a class="post-link" href="/archivers/intro-xv6">Read More »</a>
|
||||
@@ -204,7 +210,7 @@ My current solution is using AP to forward all SSL traffic to a proxy, <a href="
|
||||
</div>
|
||||
|
||||
<div class="col-box post-toc hide">
|
||||
<div class="col-box-title">TOC</div>
|
||||
<div class="col-box-title">Indexes</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
Binary file not shown.
@@ -6,7 +6,7 @@
|
||||
<meta http-equiv="X-UA-Compatible" content="IE=edge">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
|
||||
<title>About - Timeline « Stop Talking, Start Doing - 停止空想，开始行动</title>
|
||||
<title>About - Timeline « Stop Talking, Start Doing</title>
|
||||
<meta name="description" content="My personal blog, with some boring research staff and some tricks I was fancy to. I'll try my best to make this blog fun and useful. Not just a place I complain about all happens in my Lab.
|
||||
">
|
||||
|
||||
@@ -14,7 +14,7 @@
|
||||
<link rel="stylesheet" href="/css/timeline.css">
|
||||
<link rel="canonical" href="https://codersherlock.github.com//timeline/">
|
||||
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
|
||||
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing" href="https://codersherlock.github.com//feed.xml" />
|
||||
<script>
|
||||
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
|
||||
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
|
||||
@@ -39,13 +39,13 @@
|
||||
|
||||
<header class="header">
|
||||
<div class="wrapper">
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing - 停止空想，开始行动</a>
|
||||
<a class="site-title" href="/">Stop Talking, Start Doing</a>
|
||||
<nav class="site-nav">
|
||||
|
||||
|
||||
|
||||
|
||||
<a class="page-link" href="/about/">About Me</a>
|
||||
<a class="page-link" href="/about/">About</a>
|
||||
|
||||
|
||||
|
||||
@@ -222,7 +222,7 @@
|
||||
</div>
|
||||
|
||||
<div class="col-box post-toc hide">
|
||||
<div class="col-box-title">TOC</div>
|
||||
<div class="col-box-title">Indexes</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
Reference in New Issue
Block a user