From 16d2ea4c821502948d193a152c8b151f5497a0d3 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Sun, 26 Jul 2009 16:10:00 -0700
Subject: Make sure no code in ld.so uses xmm/ymm registers on x86-64.

This patch introduces a test to make sure no function modifies the
xmm/ymm registers.  With the exception of the auditing functions.

The test is probably too pessimistic.  All code linked into ld.so
is checked.  Perhaps at some point the callgraph starting from
_dl_fixup and _dl_profile_fixup is checked and we can start using
faster SSE-using functions in parts of ld.so.
---
 sysdeps/x86_64/tst-xmmymm.sh | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100755 sysdeps/x86_64/tst-xmmymm.sh

(limited to 'sysdeps/x86_64/tst-xmmymm.sh')

diff --git a/sysdeps/x86_64/tst-xmmymm.sh b/sysdeps/x86_64/tst-xmmymm.sh
new file mode 100755
index 0000000000..0735276e6d
--- /dev/null
+++ b/sysdeps/x86_64/tst-xmmymm.sh
@@ -0,0 +1,17 @@
+#! /bin/sh
+objpfx="$1"
+
+tmp=$(mktemp ${objpfx}tst-xmmymm.XXXXXX)
+trap 'rm -f "$tmp"' 1 2 3 15
+
+objdump -d "${objpfx}ld.so" |
+awk 'BEGIN { last="" } /^[[:xdigit:]]* <[_[:alnum:]]*>:$/ { fct=substr($2, 2, length($2)-3) } /,%[xy]mm[[:digit:]]*$/ { if (last != fct) { print fct; last=fct} }' |
+tee "$tmp"
+
+echo "Functions which incorrectly modify xmm/ymm registers:"
+err=1
+egrep -vs '^_dl_runtime_profile$' "$tmp" || err=0
+if test $err -eq 0; then echo "None"; fi
+
+rm "$tmp"
+exit $err
-- 
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