[PATCH] Enhance tst-xmmymm.sh to detect zmm register usage in ld.so

[Carlos O'Donell]

On 09/11/2014 01:30 PM, Siddhesh Poyarekar wrote:
> Hi,
> 
> 2d63a517e4084ec80403cd9f278690fa8b676cc4 added support to save and
> restore zmm register in the dynamic linker, but did not enhance
> test-xmmymm.sh to detect accidental usage of these registers.  The
> patch below adds that check.
> 
> Tested on x86_64 by injecting an instruction into dl-runtime.os.
> 
> Siddhesh
> 
> 	* sysdeps/x86/tst-xmmymm.sh: Check for zmm register usage.
> 
> diff --git a/sysdeps/x86/tst-xmmymm.sh b/sysdeps/x86/tst-xmmymm.sh
> index 69ddb58..fe37328 100755
> --- a/sysdeps/x86/tst-xmmymm.sh
> +++ b/sysdeps/x86/tst-xmmymm.sh
> @@ -1,5 +1,5 @@
>  #! /bin/bash
> -# Make sure no code in ld.so uses xmm/ymm registers on x86-64.
> +# Make sure no code in ld.so uses xmm/ymm/zmm registers on x86-64.
>  # Copyright (C) 2009-2014 Free Software Foundation, Inc.
>  # This file is part of the GNU C Library.
>  
> @@ -80,12 +80,12 @@ echo "object files needed: $tocheck"
>  cp /dev/null "$tmp"
>  for f in $tocheck; do
>    $OBJDUMP -d "$objpfx"../*/"$f" |
> -  awk 'BEGIN { last="" } /^[[:xdigit:]]* <[_[:alnum:]]*>:$/ { fct=substr($2, 2, length($2)-3) } /,%[xy]mm[[:digit:]]*$/ { if (last != fct) { print fct; last=fct} }' |
> +  awk 'BEGIN { last="" } /^[[:xdigit:]]* <[_[:alnum:]]*>:$/ { fct=substr($2, 2, length($2)-3) } /,%[xyz]mm[[:digit:]]*$/ { if (last != fct) { print fct; last=fct} }' |
>    while read fct; do
>      if test "$fct" = "_dl_runtime_profile" -o "$fct" = "_dl_x86_64_restore_sse"; then
>        continue;
>      fi
> -    echo "function $fct in $f modifies xmm/ymm" >> "$tmp"
> +    echo "function $fct in $f modifies xmm/ymm/zmm" >> "$tmp"
>      result=1
>    done
>  done

Please rename to tst-zmmxmmymm.sh and commit, otherwise it still
looks like it only checks for xmmymm, and that's misleading.

Cheers,
Carlos.