[Bug testsuite/31484] New: [gdb/testsuite] Add memcpy, memmove, memset watchpoint tests

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31484

            Bug ID: 31484
           Summary: [gdb/testsuite] Add memcpy, memmove, memset watchpoint
                    tests
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

While discussing aarch64 watchpoints, the point was raised that it's not clear
what addr_trap the kernel will report when using the aarch64 mops feature ops (
CPYF*, CPY*, SET* and SETG*).

For now, there doesn't seem to a an SOC out there supporting this (looking at
https://gpages.juszkiewicz.com.pl/arm-socs-table/arm-socs.html).

Nevertheless, we can add test-cases that excercise memset/memcpy/memmove and
set watchpoints.  On a mops architecture, using those will active the optimized
versions in glibc which will use the mops feature ops.

Likewise, on other architecture optimized versions may be triggered which favor
larger memory access operations, which are interesting for testing watchpoint
behaviour.

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