Merging r357376 and r359120:

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r357376 | labath | 2019-04-01 01:11:46 -0700 (Mon, 01 Apr 2019) | 27 lines

[Linux/x86] Fix writing of non-gpr registers on newer processors

Summary:
We're using ptrace(PTRACE_SETREGSET, NT_X86_XSTATE) to write all non-gpt
registers on x86 linux. Unfortunately, this method has a quirk, where
the kernel rejects all attempts to write to this area if one supplies a
buffer which is smaller than the area size (even though the kernel will
happily accept partial reads from it).

This means that if the CPU supports some new registers/extensions that
we don't know about (in my case it was the PKRU extension), we will fail
to write *any* non-gpr registers, even those that we know about.

Since this is a situation that's likely to appear again and again, I add
code to NativeRegisterContextLinux_x86_64 to detect the runtime size of
the area, and allocate an appropriate buffer. This does not mean that we
will start automatically supporting all new extensions, but it does mean
that the new extensions will not prevent the old ones from working.

This fixes tests attempting to write to non-gpr registers on new intel
processors (cca Kaby Lake Refresh).

Reviewers: jankratochvil, davezarzycki

Subscribers: lldb-commits

Differential Revision: https://reviews.llvm.org/D59991
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r359120 | josepht | 2019-04-24 11:00:12 -0700 (Wed, 24 Apr 2019) | 15 lines

[lldb] Use local definition of get_cpuid_count

Summary:
This is needed for gcc/cstdlib++ 5.4.0, where __get_cpuid_count is not
defined in cpuid.h.

Reviewers: labath

Reviewed By: labath

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D61036
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llvm-svn: 359945