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After reading your explanation about load time fixup and misp jump instruction, I still have some questions. At the link time the import stub of system call looks like: jr ra nop The psp system loader will do the load time fixup and change the stub to what looks like: jr ra system call If the system...

I am a newbie with psp programming.
After checking the kernal library implementation, I found all the entry stub of system call is replace as 03e00008 jr ra. I am really confused how the system call is made.
Hope some one here can give me the answer. Thanks.