ql.os.set_api ENTER replace the function

[et-ness]

I'm testing the example hello_mips32el_linux_function_hook.py, it should allow the executable to execute its code and intercept before the function is called and after it exits, but this doesn't happen. The QL_INTERCEPT.ENTER configuration completely blocks execution by taking control.

This is the normal behavihour of executable:

$ qemu-mipsel-static -L rootfs/mips32el_linux rootfs/mips32el_linux/bin/mips32el_double_hello 
hello1
hello2

here the output with script hello_mips32el_linux_function_hook.py

$ python3 hello_mips32el_linux_function_hook.py
puts("hello1")
after puts
puts("hello2")
after puts

The call to puts which print hello1 and hello2 are removed, I think is wrong.

This is the output with script hello_mips32el_linux_function_hook.py without QL_INTERCEPT.ENTER

$ python3 hello_mips32el_linux_function_hook.py
hello1
after puts
hello2
after puts

I tested with QL_INTERCEPT.CALL and I get the same output, so there is no difference between QL_INTERCEPT.ENTER and QL_INTERCEPT.CALL.
All these tests are done with latest stable 14.6 and with latest dev commit, same result.

Is it an issue or is the normal behaviour?