new file mode 100644
@@ -0,0 +1,27 @@
+/* Handle AT_HWCAP2. Linux/x86 version.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* The following must match the kernel's <asm/hwcap2.h>. */
+#define HWCAP2_RING3MWAIT (1 << 0)
+#define HWCAP2_FSGSBASE (1 << 1)
+
+static inline void
+dl_check_hwcap2 (struct cpu_features *cpu_features)
+{
+ if ((GLRO(dl_hwcap2) & HWCAP2_FSGSBASE) != 0)
+ CPU_FEATURE_SET_ACTIVE (cpu_features, FSGSBASE);
+}
@@ -22,6 +22,7 @@
#include <cacheinfo.h>
#include <dl-cacheinfo.h>
#include <dl-minsigstacksize.h>
+#include <dl-hwcap2.h>
#if HAVE_TUNABLES
extern void TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *)
@@ -303,6 +304,8 @@ update_active (struct cpu_features *cpu_features)
CPU_FEATURE_SET_ACTIVE (cpu_features, WIDE_KL);
}
+ dl_check_hwcap2 (cpu_features);
+
cpu_features->isa_1 = get_isa_level (cpu_features);
}
new file mode 100644
@@ -0,0 +1,21 @@
+/* Handle AT_HWCAP2. Generic x86 version.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+static inline void
+dl_check_hwcap2 (struct cpu_features *cpu_features)
+{
+}