[Bug libc/33134] New: mcount_internal shouldn't use vector/r16-r31 registers nor call memcpy/memset

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=33134

            Bug ID: 33134
           Summary: mcount_internal shouldn't use vector/r16-r31 registers
                    nor call memcpy/memset
           Product: glibc
           Version: 2.42
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: drepper.fsp at gmail dot com, fweimer at redhat dot com
  Target Milestone: ---
            Target: x86-64

Since mcount_internal is called from mcount/__fentry__ which preserve only
RAX, RCX, RDX, RSI, RDI, R8 and R9, it shouldn't use vector/r16-r31 registers
nor call memcpy/memset.

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