<html><head><style>P {margin-top:2px;margin-bottom:2px;}</style></head><body><div style="font-size:10pt; font-family:gulim,AppleGothic,sans-serif;"><P>Hello</P>
<P> </P>
<P>I am trying to implement system call hooking in wombat linux.</P>
<P> </P>
<P>I want to do some security check before allowing normal system call processing.</P>
<P> </P>
<P>I found out that the function syscall_loop() in arch/l4/kernel/main.c is the right place to add the security check mechanism.</P>
<P> </P>
<P>One of the information I need to know is the address of instruction which will be executed after returning from system call processing.</P>
<P> </P>
<P>In ARM architecture, the return address is stored in lr(link register).</P>
<P> </P>
<P>But, in case of L4, the lr doesn't seem to hvae the value of return address.</P>
<P> </P>
<P>Can anyone help me to identify the return address? (the return address in the process' own address space)</P>
<P> </P>
<P>Regards,</P>
<P> </P>
<P>SuGil </P></div></body></html><!--navermail.footer.start-->
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