1 files changed, 45 insertions, 0 deletions
diff --git a/libm/aarch64/feenablxcpt.c b/libm/aarch64/feenablxcpt.c
new file mode 100644
index 000000000..b5aa3bdc6
--- /dev/null
+++ b/libm/aarch64/feenablxcpt.c
@@ -0,0 +1,45 @@
+/* Copyright (C) 2001-2025 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/>.  */
+
+#include <fenv.h>
+#include <fpu_control.h>
+
+int
+feenableexcept (int excepts)
+{
+  fpu_control_t fpcr;
+  fpu_control_t fpcr_new;
+  fpu_control_t updated_fpcr;
+
+  _FPU_GETCW (fpcr);
+  excepts &= FE_ALL_EXCEPT;
+  fpcr_new = fpcr | (excepts << FE_EXCEPT_SHIFT);
+
+  if (fpcr != fpcr_new)
+    {
+      _FPU_SETCW (fpcr_new);
+
+      /* Trapping exceptions are optional in AArch64; the relevant enable
+	 bits in FPCR are RES0 hence the absence of support can be detected
+	 by reading back the FPCR and comparing with the required value.  */
+      _FPU_GETCW (updated_fpcr);
+
+      if (fpcr_new & ~updated_fpcr)
+	return -1;
+    }
+
+  return (fpcr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
+}