diff --git a/study/debug/tools/qemu/README.md b/study/debug/tools/qemu/README.md
index dc70917..0b3d82f 100644
--- a/study/debug/tools/qemu/README.md
+++ b/study/debug/tools/qemu/README.md
@@ -13,7 +13,7 @@ AderXCoding
 
 http://www.linuxidc.com/Linux/2014-08/105510.htm
 http://www.dataguru.cn/thread-475271-1-1.html
-
+http://blog.csdn.net/jwq2011/article/details/54708529
 http://www.mamicode.com/info-detail-1705536.html
 
 [install arm-gdb error]
diff --git a/study/patch/ptrace/a b/study/patch/ptrace/a
index b5f56db..1f35303 100755
Binary files a/study/patch/ptrace/a and b/study/patch/ptrace/a differ
diff --git a/study/patch/ptrace/ptrace_peekuser b/study/patch/ptrace/ptrace_peekuser
index 42d0566..5289a2f 100755
Binary files a/study/patch/ptrace/ptrace_peekuser and b/study/patch/ptrace/ptrace_peekuser differ
diff --git a/study/patch/ptrace/ptrace_singlestep b/study/patch/ptrace/ptrace_singlestep
index d34cf26..44a877a 100755
Binary files a/study/patch/ptrace/ptrace_singlestep and b/study/patch/ptrace/ptrace_singlestep differ
diff --git a/study/patch/ptrace/ptrace_singlestep2 b/study/patch/ptrace/ptrace_singlestep2
index 135ae69..e151f38 100755
Binary files a/study/patch/ptrace/ptrace_singlestep2 and b/study/patch/ptrace/ptrace_singlestep2 differ