[Lldb-commits] [PATCH] D159503: [lldb][AArch64] Add SME streaming vector length pseduo register

[David Spickett via Phabricator via lldb-commits]

DavidSpickett created this revision.
Herald added subscribers: sunshaoce, ctetreau, kristof.beyls.
Herald added a project: All.
DavidSpickett requested review of this revision.
Herald added a project: LLDB.
Herald added a subscriber: lldb-commits.

This adds a register "svg" which mirrors SVE's "vg" register.
This reports the streaming vector length at all times, read
from the ZA ptrace header.

This register is needed first to implement ZA resizing as
the streaming vector length changes. Like vg, svg will be
expedited to the client so it can reconfigure its register
definitions.

The other use is for users to be able to know the streaming
vector length without resorting to counting the (many, many)
bytes in ZA, or temporarily entering streaming mode (which
would be destructive).

Testing for this will come in a later patch.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159503

Files:
  lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
  lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
  lldb/source/Plugins/Process/Utility/RegisterInfoPOSIX_arm64.cpp
  lldb/source/Plugins/Process/Utility/RegisterInfoPOSIX_arm64.h

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D159503.556549.patch
Type: text/x-patch
Size: 6753 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/lldb-commits/attachments/20230912/7934897a/attachment.bin>