Updated 6 more articles from html to md

1 files changed, 56 insertions, 0 deletions

diff --git a/md/writeup/linux_antidebug_5.md b/md/writeup/linux_antidebug_5.md
new file mode 100644
index 0000000..fc71e6e
--- /dev/null
+++ b/md/writeup/linux_antidebug_5.md
@@ -0,0 +1,56 @@
+title:Linux antidebug 5
+keywords:math,statistics
+
+# Linux antidebug 5
+
+Content: When debugging program line by line or when running it
+in some debugger then there can be some time delays when you
+pressing buttons. We can measure them with asm command
+
+```asm
+rdtsc
+```
+
+this instruction read time-stamp counter into edx:eax in our
+program will be enough values from
+eax
+
+function for c that uses rdtsc is
+
+```c
+extern int get_timer()
+```
+
+in fasm it looks like
+
+```asm
+get_timer:
+    rdtsc
+    ret
+```
+
+there is written code
+
+```c
+s = get_timer();
+for (i=0;i<10000;i++)
+{
+}
+e = get_timer();
+d = e - s;
+```
+
+average time to execute 10000 is 70069 ticks for value
+on with we detecting how fast working code i have choose
+twice of average 120000 if execution time is larger then
+probably it is debuged.
+
+## Compile
+```
+make
+```
+
+## Download
+
+http://archive.main.lv/files/writeup/linux_antidebug_5/antidebug5.zip
+