Messages in this thread | | | Date | Thu, 14 Feb 2013 11:21:12 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] x86: make PTRACE_GETREGSET return 32-bit regs if 64-bit process entered kernel with int 80 |
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On 02/14/2013 11:18 AM, Oleg Nesterov wrote: > On 02/14, H. Peter Anvin wrote: >> >> On 02/14/2013 07:00 AM, Oleg Nesterov wrote: >>> On 02/14, Denys Vlasenko wrote: >>>> >>>> Determining personality of a ptraced process is a murky area. >>>> On x86, for years strace was looking at segment selectors, >>>> which is conceptually wrong: see, for example, >>>> https://lkml.org/lkml/2012/1/18/320 >>>> >> >> One proposal that keeps being on the table is to export a regset with >> metadatam, including process mode at launch (i386, x86-64, x32). > > Yes... but if this metadata includes TS_COMPAT-is-set, then strace should > do PTRACE_GETREGSET(REGSET_META) + PTRACE_GETREGSET(REGSET_GENERAL) every > time. Or REGSET_META should include META+GENERAL. > > IOW, it is not clear to me what this "meta" should actually report. >
That is one of the things that needs to be nailed down. In particular, what are the things people need.
-hpa
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