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As promised, here (once again) is a pointer to the kretprobes patch (against 2.6.13) that adds an optional "data pouch" to a kretprobe_instance. This makes it easy for data such as arg values to be saved upon function entry and recalled upon return. This was written by Kevin Stafford and smoke-tested by me.
This patch would be very useful. However, there is a doubt: You access function args by ESP. That would not work if the kernel compiled without "frame pointer" option.
regards, J
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