Messages in this thread | | | Date | Mon, 22 Feb 2016 14:50:00 -0800 | From | Yu-cheng Yu <> | Subject | Re: [PATCH 08/10] x86/xsaves: Fix PTRACE frames for XSAVES |
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On Mon, Feb 22, 2016 at 02:45:54PM -0800, Andy Lutomirski wrote: > > +/* > > + * Convert from kernel XSAVES compacted format to standard format and copy > > + * to a ptrace buffer. It supports partial copy but pos always starts from > > + * zero. This is called from xstateregs_get() and there we check the cpu > > + * has XSAVES. > > + */ > > +int copyout_from_xsaves(unsigned int pos, unsigned int count, void *kbuf, > > + void __user *ubuf, const struct xregs_state *xsave) > > Now that you've written this code, can it be shared with the signal > handling code? >
For signal handling, we most likely save registers directly to memory. But for ptrace, the thread being debugged is not the active thread. Please let me think about it more.
--Yu-cheng
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