Support mixed SSE/AVX audit and check AVX only once.

This patch fixes mixed SSE/AVX audit and checks AVX only once in
_dl_runtime_profile. When an AVX or SSE register value in pltenter is
modified, we have to make sure that the SSE part value is the same in both
lr_xmm and lr_vector fields so that pltexit will get the correct value
from either lr_xmm or lr_vector fields. AVX-enabled pltenter should
update both lr_xmm and lr_vector fields to support stacked AVX/SSE
pltenter functions.

1 files changed, 28 insertions, 0 deletions

diff --git a/elf/tst-audit6.c b/elf/tst-audit6.c
new file mode 100644
index 0000000000..1f6dcb16e9
--- /dev/null
+++ b/elf/tst-audit6.c
@@ -0,0 +1,28 @@
+/* Test case for x86-64 preserved registers in dynamic linker.  */
+
+#include <stdlib.h>
+#include <string.h>
+#include <cpuid.h>
+#include <emmintrin.h>
+
+extern __m128i audit_test (__m128i, __m128i, __m128i, __m128i,
+			   __m128i, __m128i, __m128i, __m128i);
+
+int
+main (void)
+{
+  unsigned int eax, ebx, ecx, edx;
+
+  /* Run AVX test only if AVX is supported.  */
+  if (__get_cpuid (1, &eax, &ebx, &ecx, &edx)
+      && (ecx & bit_AVX))
+    {
+      __m128i xmm = _mm_setzero_si128 ();
+      __m128i ret = audit_test (xmm, xmm, xmm, xmm, xmm, xmm, xmm, xmm);
+
+      xmm = _mm_set1_epi32 (0x98abcdef);
+      if (memcmp (&xmm, &ret, sizeof (ret)))
+	abort ();
+    }
+  return 0;
+}