Scott Tsai scottt
scottt
/ TWKLH-description.txt.patch
Last active
August 20, 2018 14:14
Proposed change to TWLKH FB group description
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| --- TWLKH-description.txt 2018-08-20 21:49:59.361145866 +0800 | |
| +++ TWLKH-description.txt.hacked 2018-08-20 22:12:40.319784822 +0800 | |
| @@ -17,23 +17,6 @@ | |
| 社團另有 slack 聊天室位於 | |
| https://twlinuxkernelhackers.slack.com/ | |
| -欲加入社團FB messenger群組請洽管理員。 | |
| - | |
| -Kernel 內容繁雜，目前依據貼文的內容用tag在 Facebook 上面分類（字母排序） | |
| - |
scottt
/ stack-and-sp.c
Created
June 11, 2018 23:12
stack-and-sp: test whether stack access without setting the stack pointer register would cause SEGFAULTs on x86-64
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| /* x86-64 program to test wether stack access without setting the stack poitner register would cause SEGFAULTs | |
| * $ ./stack-and-sp # just access stack adjacent memory until SEGFAULT. | |
| * $ ./stack-and-sp --set-sp # set stack pointer register before accessing memory. | |
| * | |
| * Output: | |
| * stack-and-sp: do_set_sp: 1 | |
| * RLIMIT_STACK: 8192/unlimited (cur/max) | |
| * sp0: 0x7ffd5fdd3000 | |
| * sp: 0x7ffd5f5d7000, size: 8176K | |
| */ |
scottt
/ TRANSCRIPT
Created
May 31, 2018 14:21
Interruption and auto restart of syscall after signal handler execution
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| $ gdb -q -x syscall-restart-after-handler.gdb | |
| Breakpoint 1 at 0x400920: file syscall-restart-after-handler.c, line 13. | |
| pre blocking read on pipe | |
| Breakpoint 1, sig_handler (sig=14, info=0x7fffffffc230, ctx=0x7fffffffc100) at syscall-restart-after-handler.c:13 | |
| warning: Source file is more recent than executable. | |
| 13 fprintf(stderr, "%s: caught signal %d (%s) \n", program_name, sig, strsignal(sig)); | |
| #0 sig_handler (sig=14, info=0x7fffffffc230, ctx=0x7fffffffc100) at syscall-restart-after-handler.c:13 | |
| #1 <signal handler called> | |
| #2 0x00007ffff7b02fc1 in __GI___libc_read (fd=3, buf=buf@entry=0x7fffffffc6b7, nbytes=nbytes@entry=1) at ../sysdeps/unix/sysv/linux/read.c:27 |
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| /* Burn some CPU time then segfault */ | |
| int main() | |
| { | |
| volatile int i; | |
| for (i=0; i>=0; i++) | |
| ; | |
| *(volatile char*)0; | |
| return 0; | |
| } |
scottt
/ Reply-to-Question-about-NCCU-MOOC-Week-4-Homework.ipynb
Created
November 19, 2017 21:13
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scottt
/ Week-3-Homework.ipynb
Created
November 15, 2017 08:38
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scottt
/ Newton's Method.ipynb
Created
November 13, 2017 03:11
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/ Fused-Multiply-Add-vs-Non-Fused-Rounding-Difference-for-Dot-Product-Explained.ipynb
Created
November 6, 2017 09:09
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scottt
/ Matplotlib-Set-Font-for-zh-TW.ipynb
Created
October 26, 2017 05:18
Matplotlib set suitable font for zh_TW text
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