https://bugs.kde.org/show_bug.cgi?id=430117
Bug ID: 430117
Summary: Implement guest Arm64/AArch64 feature detection
support for v8 instructions
Product: valgrind
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: vex
Assignee: jsew...@acm.org
Reporter: assad.has...@linaro.org
Target Milestone: ---
SUMMARY
The bug https://bugs.kde.org/show_bug.cgi?id=414268 added host AArch64 feature
detection and decoding for v8.x.
However, Valgrind must provide a view of v8.x instructions supported by
Valgrind to the guest which will not be the same as those supported by the
host, until they have been implemented in Valgrind.
ADDITIONAL INFORMATION
A helper function needs to be implemented which provides a filtered view to the
guest of a set of instructions implemented by Valgrind.
This is not the same as the set of instructions supported by the host which
Valgrind reads in order to decode instructions which may or may not be
supported by Valgrind.
When instructions are decoded, this helper function is planted in the IR to
provide the guest with the filtered view of what Valgrind wants the guest to
think are the instructions supported by the host.
As an existing example, see the x86 implementation of populating guest state
with SSE1 support: x86g_dirtyhelper_CPUID_sse1(). This sets VexGuestX86State
with SSE1 features supported by Valgrind. A pointer to the function is planted
in IR by unsafeIRDirty_0_N() when SSE1 instructions are decoded.
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