llvm-project/lldb/packages/Python/lldbsuite
Pavel Labath d2cfe0e597 Fix floating point register write on new x86 linux kernels
Summary:
New linux kernels (on systems that support the XSAVES instruction) will
not update the inferior registers unless the corresponding flag in the
XSAVE header is set. Normally this flag will be set in our image of the
XSAVE area (since we obtained it from the kernel), but if the inferior
has never used the corresponding register set, the respective flag can
be clear.

This fixes the issue by making sure we explicitly set the flags
corresponding to the registers we modify. I don't try to precisely match
the flags to set on each write, as the rules could get quite complicated
-- I use a simpler over-approximation instead.

This was already caught by test_fp_register_write, but that was only
because the code that ran before main() did not use some of the register
sets. Since nothing in this test relies on being stopped in main(), I
modify the test to stop at the entry point instead, so we can be sure
the inferior did not have a chance to access these registers.

Reviewers: clayborg, valentinagiusti

Subscribers: lldb-commits

Differential Revision: https://reviews.llvm.org/D40434

llvm-svn: 319161
2017-11-28 10:56:54 +00:00
..
pre_kill_hook added Linux support for test timeout sampling 2016-09-26 20:25:47 +00:00
support *** This commit represents a complete reformatting of the LLDB source code 2016-09-06 20:57:50 +00:00
test Fix floating point register write on new x86 linux kernels 2017-11-28 10:56:54 +00:00
test_event fix xunit attribute parsing 2017-03-11 00:58:41 +00:00
.clang-format Updated .clang-format rules so bring LLDB in line with LLVM standards. 2016-09-06 17:19:00 +00:00
__init__.py *** This commit represents a complete reformatting of the LLDB source code 2016-09-06 20:57:50 +00:00