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From: "thiago.bauermann at linaro dot org"
 <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug tdep/31666] New: Support aarch64 mops feature ops ( CPYF*,
 CPY*, SET* and SETG*)
Date: Mon, 22 Apr 2024 04:11:17 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: tdep
X-Bugzilla-Version: HEAD
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: thiago.bauermann at linaro dot org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31666

            Bug ID: 31666
           Summary: Support aarch64 mops feature ops ( CPYF*, CPY*, SET*
                    and SETG*)
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: thiago.bauermann at linaro dot org
  Target Milestone: ---

Starting with Arm v8.8/v9.3, a new architectural feature (FEAT_MOPS) provid=
es
new instructions to perform memory copy and memory set operations in a
standardized way. There are specialized versions of memcpy, memmove and mem=
set
using them in glibc 2.39.

These instructions appear as a sequence of 3: one prologue, one main and one
epilogue instruction. The AArch64 target of GDB needs two things to support
them:

1. Recognize the trio of instructions as one atomic sequence.
2. Recognize the instructions for record/replay.

Patches for both are being finalized and will be posted in the next few day=
s.

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