[PATCH] libgcc: aarch64: Get hwcap for FreeBSD

[Andreas Tobler]

Hi all,

Since FreeBSD 12, FreeBSD has a sys/auxv.h header too but it doesn't
provide the getauxval function. Instead it offers the elf_aux_info
function which provides a similar functionality.
This patch gets the hwcap for FreeBSD.
Is this ok for trunk?

TIA,
Andreas

+2020-05-05  Andreas Tobler  <andre...@gcc.gnu.org>
+
+       * config/aarch64/lse-init.c: Get hwcap for FreeBSD.
+

diff --git a/libgcc/config/aarch64/lse-init.c 
b/libgcc/config/aarch64/lse-init.c
index 00e9ab8cd1c..ab0d6b2f754 100644
--- a/libgcc/config/aarch64/lse-init.c
+++ b/libgcc/config/aarch64/lse-init.c
@@ -41,7 +41,16 @@ unsigned long int __getauxval (unsigned long int);
 static void __attribute__((constructor))
 init_have_lse_atomics (void)
 {
+#ifndef __FreeBSD__
   unsigned long hwcap = __getauxval (AT_HWCAP);
+#else
+  unsigned long hwcap;
+  int err;
+
+  err = elf_aux_info(AT_HWCAP, &hwcap, sizeof(hwcap));
+  if (err)
+    hwcap = 0;
+#endif
   __aarch64_have_lse_atomics = (hwcap & HWCAP_ATOMICS) != 0;
 }