On 7 January 2016 at 17:10, Guenter Roeck <li...@roeck-us.net> wrote: > Strictly speaking you may be right (regression is a bit strong, though), > but for my part I tend to be pragmatic. > > A warning message such as "Access to unimplemented register X" may be > useful
You can get these from QEMU if you pass it "-d unimp", which logs various kinds of things-not-yet-implemented, with a couple of caveats: * the warning is when we translate the code, not when we execute it * it won't warn for registers which we implement but not completely (eg only partial functionality or dummy reads-as-written) In this case it printed "write access to unsupported AArch64 system register op0:3 op1:3 crn:9 crm:14 op2:0" The 'guest_errors' suboption to -d warns about things which appear to be errors in the guest OS, for instance some kinds of UNPREDICTABLE, and may also be of interest. Neither guest_errors nor unimp are comprehensive (there are many more situations where we don't warn than where we do) but they can be helpful sometimes. thanks -- PMM
