arm: add fenv support from glibc

20 files changed, 1083 insertions, 0 deletions

diff --git a/libm/arm/Makefile.arch b/libm/arm/Makefile.arch
new file mode 100644
index 000000000..bd38690be
--- /dev/null
+++ b/libm/arm/Makefile.arch
@@ -0,0 +1,16 @@
+# Makefile for uClibc-ng
+# Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+
+ifeq ($(UCLIBC_HAS_FENV),y)
+libm_ARCH_SRC:=$(wildcard $(libm_ARCH_DIR)/*.c)
+libm_ARCH_OBJ:=$(patsubst $(libm_ARCH_DIR)/%.c,$(libm_ARCH_OUT)/%.o,$(libm_ARCH_SRC))
+endif
+
+libm_ARCH_OBJS:=$(libm_ARCH_OBJ)
+
+ifeq ($(DOPIC),y)
+libm-a-y+=$(libm_ARCH_OBJS:.o=.os)
+else
+libm-a-y+=$(libm_ARCH_OBJS)
+endif
+libm-so-y+=$(libm_ARCH_OBJS:.o=.os)
diff --git a/libm/arm/arm-features.h b/libm/arm/arm-features.h
new file mode 100644
index 000000000..8f9fd7362
--- /dev/null
+++ b/libm/arm/arm-features.h
@@ -0,0 +1,58 @@
+/* Macros to test for CPU features on ARM.  Generic ARM version.
+   Copyright (C) 2012-2025 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/>.  */
+
+#ifndef _ARM_ARM_FEATURES_H
+#define _ARM_ARM_FEATURES_H 1
+
+/* An OS-specific arm-features.h file should define ARM_HAVE_VFP to
+   an appropriate expression for testing at runtime whether the VFP
+   hardware is present.  We'll then redefine it to a constant if we
+   know at compile time that we can assume VFP.  */
+
+#ifndef __SOFTFP__
+/* The compiler is generating VFP instructions, so we're already
+   assuming the hardware exists.  */
+# undef ARM_HAVE_VFP
+# define ARM_HAVE_VFP	1
+#endif
+
+/* An OS-specific arm-features.h file may define ARM_ASSUME_NO_IWMMXT
+   to indicate at compile time that iWMMXt hardware is never present
+   at runtime (or that we never care about its state) and so need not
+   be checked for.  */
+
+/* A more-specific arm-features.h file may define ARM_ALWAYS_BX to indicate
+   that instructions using pc as a destination register must never be used,
+   so a "bx" (or "blx") instruction is always required.  */
+
+/* The log2 of the minimum alignment required for an address that
+   is the target of a computed branch (i.e. a "bx" instruction).
+   A more-specific arm-features.h file may define this to set a more
+   stringent requirement.
+
+   Using this only makes sense for code in ARM mode (where instructions
+   always have a fixed size of four bytes), or for Thumb-mode code that is
+   specifically aligning all the related branch targets to match (since
+   Thumb instructions might be either two or four bytes).  */
+#ifndef ARM_BX_ALIGN_LOG2
+# define ARM_BX_ALIGN_LOG2	2
+#endif
+
+/* An OS-specific arm-features.h file may define ARM_NO_INDEX_REGISTER to
+   indicate that the two-register addressing modes must never be used.  */
+
+#endif  /* arm-features.h */
diff --git a/libm/arm/fclrexcpt.c b/libm/arm/fclrexcpt.c
new file mode 100644
index 000000000..81de94271
--- /dev/null
+++ b/libm/arm/fclrexcpt.c
@@ -0,0 +1,41 @@
+/* Clear given exceptions in current floating-point environment.
+   Copyright (C) 1997-2025 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>
+#include "arm-features.h"
+
+
+int
+feclearexcept (int excepts)
+{
+  fpu_control_t fpscr, new_fpscr;
+
+  /* Fail if a VFP unit isn't present unless nothing needs to be done.  */
+  if (!ARM_HAVE_VFP)
+    return (excepts != 0);
+
+  _FPU_GETCW (fpscr);
+  excepts &= FE_ALL_EXCEPT;
+  new_fpscr = fpscr & ~excepts;
+
+  /* Write new exception flags if changed.  */
+  if (new_fpscr != fpscr)
+    _FPU_SETCW (new_fpscr);
+
+  return 0;
+}
diff --git a/libm/arm/fedisblxcpt.c b/libm/arm/fedisblxcpt.c
new file mode 100644
index 000000000..c507e80b4
--- /dev/null
+++ b/libm/arm/fedisblxcpt.c
@@ -0,0 +1,41 @@
+/* Disable floating-point exceptions.
+   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>
+#include "arm-features.h"
+
+
+int
+fedisableexcept (int excepts)
+{
+  fpu_control_t fpscr, new_fpscr;
+
+  /* Fail if a VFP unit isn't present.  */
+  if (!ARM_HAVE_VFP)
+    return -1;
+
+  _FPU_GETCW (fpscr);
+  excepts &= FE_ALL_EXCEPT;
+  new_fpscr = fpscr & ~(excepts << FE_EXCEPT_SHIFT);
+
+  /* Write new exceptions if changed.  */
+  if (new_fpscr != fpscr)
+    _FPU_SETCW (new_fpscr);
+
+  return (fpscr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
+}
diff --git a/libm/arm/feenablxcpt.c b/libm/arm/feenablxcpt.c
new file mode 100644
index 000000000..41e8eb912
--- /dev/null
+++ b/libm/arm/feenablxcpt.c
@@ -0,0 +1,49 @@
+/* Enable floating-point exceptions.
+   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>
+#include "arm-features.h"
+
+
+int
+feenableexcept (int excepts)
+{
+  fpu_control_t fpscr, new_fpscr, updated_fpscr;
+
+  /* Fail if a VFP unit isn't present.  */
+  if (!ARM_HAVE_VFP)
+    return -1;
+
+  _FPU_GETCW (fpscr);
+  excepts &= FE_ALL_EXCEPT;
+  new_fpscr = fpscr | (excepts << FE_EXCEPT_SHIFT);
+
+  if (new_fpscr != fpscr)
+    {
+      _FPU_SETCW (new_fpscr);
+
+      /* Not all VFP architectures support trapping exceptions, so
+	 test whether the relevant bits were set and fail if not.  */
+      _FPU_GETCW (updated_fpscr);
+
+      if (new_fpscr & ~updated_fpscr)
+	return -1;
+    }
+
+  return (fpscr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
+}
diff --git a/libm/arm/fegetenv.c b/libm/arm/fegetenv.c
new file mode 100644
index 000000000..a9f63f5c9
--- /dev/null
+++ b/libm/arm/fegetenv.c
@@ -0,0 +1,35 @@
+/* Store current floating-point environment.
+   Copyright (C) 1997-2025 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>
+#include "arm-features.h"
+
+
+int
+fegetenv (fenv_t *envp)
+{
+  fpu_control_t fpscr;
+
+  /* Fail if a VFP unit isn't present.  */
+  if (!ARM_HAVE_VFP)
+    return 1;
+
+  _FPU_GETCW (fpscr);
+  envp->__cw = fpscr;
+  return 0;
+}
diff --git a/libm/arm/fegetexcept.c b/libm/arm/fegetexcept.c
new file mode 100644
index 000000000..5dd8e144b
--- /dev/null
+++ b/libm/arm/fegetexcept.c
@@ -0,0 +1,35 @@
+/* Get floating-point exceptions.
+   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>
+#include "arm-features.h"
+
+
+int
+fegetexcept (void)
+{
+  fpu_control_t fpscr;
+
+  /* Return with all exceptions disabled if a VFP unit isn't present.  */
+  if (!ARM_HAVE_VFP)
+    return 0;
+
+  _FPU_GETCW (fpscr);
+
+  return (fpscr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
+}
diff --git a/libm/arm/fegetmode.c b/libm/arm/fegetmode.c
new file mode 100644
index 000000000..bf2597353
--- /dev/null
+++ b/libm/arm/fegetmode.c
@@ -0,0 +1,28 @@
+/* Store current floating-point control modes.  ARM version.
+   Copyright (C) 2016-2025 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>
+#include "arm-features.h"
+
+int
+fegetmode (femode_t *modep)
+{
+  if (ARM_HAVE_VFP)
+    _FPU_GETCW (*modep);
+  return 0;
+}
diff --git a/libm/arm/fegetround.c b/libm/arm/fegetround.c
new file mode 100644
index 000000000..2f9320491
--- /dev/null
+++ b/libm/arm/fegetround.c
@@ -0,0 +1,42 @@
+/* Return current rounding direction.
+   Copyright (C) 2004-2025 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 "arm-features.h"
+#include <fenv.h>
+#include <fpu_control.h>
+
+/* Return the floating-point rounding mode.  */
+
+static inline int
+get_rounding_mode (void)
+{
+  fpu_control_t fpscr;
+
+  /* FE_TONEAREST is the only supported rounding mode
+     if a VFP unit isn't present.  */
+  if (!ARM_HAVE_VFP)
+    return FE_TONEAREST;
+
+  _FPU_GETCW (fpscr);
+  return fpscr & _FPU_MASK_RM;
+}
+
+int
+fegetround (void)
+{
+  return get_rounding_mode ();
+}
diff --git a/libm/arm/feholdexcpt.c b/libm/arm/feholdexcpt.c
new file mode 100644
index 000000000..3608931db
--- /dev/null
+++ b/libm/arm/feholdexcpt.c
@@ -0,0 +1,31 @@
+/* Store current floating-point environment and clear exceptions.
+   Copyright (C) 1997-2025 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_private.h"
+#include "arm-features.h"
+
+
+int
+feholdexcept (fenv_t *envp)
+{
+  /* Fail if a VFP unit isn't present.  */
+  if (!ARM_HAVE_VFP)
+    return 1;
+
+  libc_feholdexcept_vfp (envp);
+  return 0;
+}
diff --git a/libm/arm/fenv_private.h b/libm/arm/fenv_private.h
new file mode 100644
index 000000000..566bf443c
--- /dev/null
+++ b/libm/arm/fenv_private.h
@@ -0,0 +1,248 @@
+/* Private floating point rounding and exceptions handling.  ARM VFP version.
+   Copyright (C) 2014-2025 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/>.  */
+
+#ifndef ARM_FENV_PRIVATE_H
+#define ARM_FENV_PRIVATE_H 1
+
+#include <fenv.h>
+#include <fpu_control.h>
+
+static __always_inline void
+libc_feholdexcept_vfp (fenv_t *envp)
+{
+  fpu_control_t fpscr;
+
+  _FPU_GETCW (fpscr);
+  envp->__cw = fpscr;
+
+  /* Clear exception flags and set all exceptions to non-stop.  */
+  fpscr &= ~_FPU_MASK_EXCEPT;
+  _FPU_SETCW (fpscr);
+}
+
+static __always_inline void
+libc_fesetround_vfp (int round)
+{
+  fpu_control_t fpscr;
+
+  _FPU_GETCW (fpscr);
+
+  /* Set new rounding mode if different.  */
+  if (unlikely ((fpscr & _FPU_MASK_RM) != round))
+    _FPU_SETCW ((fpscr & ~_FPU_MASK_RM) | round);
+}
+
+static __always_inline void
+libc_feholdexcept_setround_vfp (fenv_t *envp, int round)
+{
+  fpu_control_t fpscr;
+
+  _FPU_GETCW (fpscr);
+  envp->__cw = fpscr;
+
+  /* Clear exception flags, set all exceptions to non-stop,
+     and set new rounding mode.  */
+  fpscr &= ~(_FPU_MASK_EXCEPT | _FPU_MASK_RM);
+  _FPU_SETCW (fpscr | round);
+}
+
+static __always_inline void
+libc_feholdsetround_vfp (fenv_t *envp, int round)
+{
+  fpu_control_t fpscr;
+
+  _FPU_GETCW (fpscr);
+  envp->__cw = fpscr;
+
+  /* Set new rounding mode if different.  */
+  if (unlikely ((fpscr & _FPU_MASK_RM) != round))
+    _FPU_SETCW ((fpscr & ~_FPU_MASK_RM) | round);
+}
+
+static __always_inline void
+libc_feresetround_vfp (fenv_t *envp)
+{
+  fpu_control_t fpscr, round;
+
+  _FPU_GETCW (fpscr);
+
+  /* Check whether rounding modes are different.  */
+  round = (envp->__cw ^ fpscr) & _FPU_MASK_RM;
+
+  /* Restore the rounding mode if it was changed.  */
+  if (unlikely (round != 0))
+    _FPU_SETCW (fpscr ^ round);
+}
+
+static __always_inline int
+libc_fetestexcept_vfp (int ex)
+{
+  fpu_control_t fpscr;
+
+  _FPU_GETCW (fpscr);
+  return fpscr & ex & FE_ALL_EXCEPT;
+}
+
+static __always_inline void
+libc_fesetenv_vfp (const fenv_t *envp)
+{
+  fpu_control_t fpscr, new_fpscr;
+
+  _FPU_GETCW (fpscr);
+  new_fpscr = envp->__cw;
+
+  /* Write new FPSCR if different (ignoring NZCV flags).  */
+  if (unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
+    _FPU_SETCW (new_fpscr);
+}
+
+static __always_inline int
+libc_feupdateenv_test_vfp (const fenv_t *envp, int ex)
+{
+  fpu_control_t fpscr, new_fpscr;
+  int excepts;
+
+  _FPU_GETCW (fpscr);
+
+  /* Merge current exception flags with the saved fenv.  */
+  excepts = fpscr & FE_ALL_EXCEPT;
+  new_fpscr = envp->__cw | excepts;
+
+  /* Write new FPSCR if different (ignoring NZCV flags).  */
+  if (unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
+    _FPU_SETCW (new_fpscr);
+
+  /* Raise the exceptions if enabled in the new FP state.  */
+  if (unlikely (excepts & (new_fpscr >> FE_EXCEPT_SHIFT)))
+    feraiseexcept (excepts);
+
+  return excepts & ex;
+}
+
+static __always_inline void
+libc_feupdateenv_vfp (const fenv_t *envp)
+{
+  libc_feupdateenv_test_vfp (envp, 0);
+}
+
+static __always_inline void
+libc_feholdsetround_vfp_ctx (struct rm_ctx *ctx, int r)
+{
+  fpu_control_t fpscr, round;
+
+  _FPU_GETCW (fpscr);
+  ctx->updated_status = false;
+  ctx->env.__cw = fpscr;
+
+  /* Check whether rounding modes are different.  */
+  round = (fpscr ^ r) & _FPU_MASK_RM;
+
+  /* Set the rounding mode if changed.  */
+  if (unlikely (round != 0))
+    {
+      ctx->updated_status = true;
+      _FPU_SETCW (fpscr ^ round);
+    }
+}
+
+static __always_inline void
+libc_feresetround_vfp_ctx (struct rm_ctx *ctx)
+{
+  /* Restore the rounding mode if updated.  */
+  if (unlikely (ctx->updated_status))
+    {
+      fpu_control_t fpscr;
+
+      _FPU_GETCW (fpscr);
+      fpscr = (fpscr & ~_FPU_MASK_RM) | (ctx->env.__cw & _FPU_MASK_RM);
+      _FPU_SETCW (fpscr);
+    }
+}
+
+static __always_inline void
+libc_fesetenv_vfp_ctx (struct rm_ctx *ctx)
+{
+  fpu_control_t fpscr, new_fpscr;
+
+  _FPU_GETCW (fpscr);
+  new_fpscr = ctx->env.__cw;
+
+  /* Write new FPSCR if different (ignoring NZCV flags).  */
+  if (unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
+    _FPU_SETCW (new_fpscr);
+}
+
+#ifndef __SOFTFP__
+
+# define libc_feholdexcept  libc_feholdexcept_vfp
+# define libc_feholdexceptf libc_feholdexcept_vfp
+# define libc_feholdexceptl libc_feholdexcept_vfp
+
+# define libc_fesetround  libc_fesetround_vfp
+# define libc_fesetroundf libc_fesetround_vfp
+# define libc_fesetroundl libc_fesetround_vfp
+
+# define libc_feresetround  libc_feresetround_vfp
+# define libc_feresetroundf libc_feresetround_vfp
+# define libc_feresetroundl libc_feresetround_vfp
+
+# define libc_feresetround_noex  libc_fesetenv_vfp
+# define libc_feresetround_noexf libc_fesetenv_vfp
+# define libc_feresetround_noexl libc_fesetenv_vfp
+
+# define libc_feholdexcept_setround  libc_feholdexcept_setround_vfp
+# define libc_feholdexcept_setroundf libc_feholdexcept_setround_vfp
+# define libc_feholdexcept_setroundl libc_feholdexcept_setround_vfp
+
+# define libc_feholdsetround  libc_feholdsetround_vfp
+# define libc_feholdsetroundf libc_feholdsetround_vfp
+# define libc_feholdsetroundl libc_feholdsetround_vfp
+
+# define libc_fetestexcept  libc_fetestexcept_vfp
+# define libc_fetestexceptf libc_fetestexcept_vfp
+# define libc_fetestexceptl libc_fetestexcept_vfp
+
+# define libc_fesetenv  libc_fesetenv_vfp
+# define libc_fesetenvf libc_fesetenv_vfp
+# define libc_fesetenvl libc_fesetenv_vfp
+
+# define libc_feupdateenv  libc_feupdateenv_vfp
+# define libc_feupdateenvf libc_feupdateenv_vfp
+# define libc_feupdateenvl libc_feupdateenv_vfp
+
+# define libc_feupdateenv_test  libc_feupdateenv_test_vfp
+# define libc_feupdateenv_testf libc_feupdateenv_test_vfp
+# define libc_feupdateenv_testl libc_feupdateenv_test_vfp
+
+/* We have support for rounding mode context.  */
+#define HAVE_RM_CTX 1
+
+# define libc_feholdsetround_ctx	libc_feholdsetround_vfp_ctx
+# define libc_feresetround_ctx		libc_feresetround_vfp_ctx
+# define libc_feresetround_noex_ctx	libc_fesetenv_vfp_ctx
+
+# define libc_feholdsetroundf_ctx	libc_feholdsetround_vfp_ctx
+# define libc_feresetroundf_ctx		libc_feresetround_vfp_ctx
+# define libc_feresetround_noexf_ctx	libc_fesetenv_vfp_ctx
+
+# define libc_feholdsetroundl_ctx	libc_feholdsetround_vfp_ctx
+# define libc_feresetroundl_ctx		libc_feresetround_vfp_ctx
+# define libc_feresetround_noexl_ctx	libc_fesetenv_vfp_ctx
+
+#endif
+
+#endif /* ARM_FENV_PRIVATE_H */
diff --git a/libm/arm/fesetenv.c b/libm/arm/fesetenv.c
new file mode 100644
index 000000000..4675dbe88
--- /dev/null
+++ b/libm/arm/fesetenv.c
@@ -0,0 +1,62 @@
+/* Install given floating-point environment.
+   Copyright (C) 2004-2025 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>
+#include "arm-features.h"
+
+
+int
+fesetenv (const fenv_t *envp)
+{
+  fpu_control_t fpscr, new_fpscr, updated_fpscr;
+
+  /* Fail if a VFP unit isn't present.  */
+  if (!ARM_HAVE_VFP)
+    return 1;
+
+  _FPU_GETCW (fpscr);
+
+  if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV))
+    {
+      /* The new FPSCR is valid, so don't merge the reserved flags.  */
+      new_fpscr = envp->__cw;
+
+      /* Write new FPSCR if different (ignoring NZCV flags).  */
+      if (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0)
+	_FPU_SETCW (new_fpscr);
+
+      return 0;
+    }
+
+  /* Preserve the reserved FPSCR flags.  */
+  new_fpscr = fpscr & _FPU_RESERVED;
+  new_fpscr |= (envp == FE_DFL_ENV) ? _FPU_DEFAULT : _FPU_IEEE;
+
+  if (((new_fpscr ^ fpscr) & ~_FPU_MASK_NZCV) != 0)
+    {
+      _FPU_SETCW (new_fpscr);
+
+      /* Not all VFP architectures support trapping exceptions, so
+	 test whether the relevant bits were set and fail if not.  */
+      _FPU_GETCW (updated_fpscr);
+
+      return new_fpscr & ~updated_fpscr;
+    }
+
+  return 0;
+}
diff --git a/libm/arm/fesetexcept.c b/libm/arm/fesetexcept.c
new file mode 100644
index 000000000..03338c783
--- /dev/null
+++ b/libm/arm/fesetexcept.c
@@ -0,0 +1,37 @@
+/* Set given exception flags.  ARM version.
+   Copyright (C) 2016-2025 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>
+#include "arm-features.h"
+
+int
+fesetexcept (int excepts)
+{
+  fpu_control_t fpscr, new_fpscr;
+
+  /* Fail if a VFP unit isn't present unless nothing needs to be done.  */
+  if (!ARM_HAVE_VFP)
+    return (excepts != 0);
+
+  _FPU_GETCW (fpscr);
+  new_fpscr = fpscr | (excepts & FE_ALL_EXCEPT);
+  if (new_fpscr != fpscr)
+    _FPU_SETCW (new_fpscr);
+
+  return 0;
+}
diff --git a/libm/arm/fesetmode.c b/libm/arm/fesetmode.c
new file mode 100644
index 000000000..7919022b0
--- /dev/null
+++ b/libm/arm/fesetmode.c
@@ -0,0 +1,44 @@
+/* Install given floating-point control modes.  ARM version.
+   Copyright (C) 2016-2025 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>
+#include "arm-features.h"
+
+/* NZCV flags, QC bit, IDC bit and bits for IEEE exception status.  */
+#define FPU_STATUS_BITS 0xf800009f
+
+int
+fesetmode (const femode_t *modep)
+{
+  fpu_control_t fpscr, new_fpscr;
+
+  if (!ARM_HAVE_VFP)
+    /* Nothing to do.  */
+    return 0;
+
+  _FPU_GETCW (fpscr);
+  if (modep == FE_DFL_MODE)
+    new_fpscr = (fpscr & (_FPU_RESERVED | FPU_STATUS_BITS)) | _FPU_DEFAULT;
+  else
+    new_fpscr = (fpscr & FPU_STATUS_BITS) | (*modep & ~FPU_STATUS_BITS);
+
+  if (((new_fpscr ^ fpscr) & ~_FPU_MASK_NZCV) != 0)
+    _FPU_SETCW (new_fpscr);
+
+  return 0;
+}
diff --git a/libm/arm/fesetround.c b/libm/arm/fesetround.c
new file mode 100644
index 000000000..1cb6b366c
--- /dev/null
+++ b/libm/arm/fesetround.c
@@ -0,0 +1,35 @@
+/* Set current rounding direction.
+   Copyright (C) 2004-2025 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_private.h"
+#include "arm-features.h"
+
+
+int
+fesetround (int round)
+{
+  /* FE_TONEAREST is the only supported rounding mode
+     if a VFP unit isn't present.  */
+  if (!ARM_HAVE_VFP)
+    return (round == FE_TONEAREST) ? 0 : 1;
+
+  if (round & ~_FPU_MASK_RM)
+    return 1;
+
+  libc_fesetround_vfp (round);
+  return 0;
+}
diff --git a/libm/arm/feupdateenv.c b/libm/arm/feupdateenv.c
new file mode 100644
index 000000000..a246b865b
--- /dev/null
+++ b/libm/arm/feupdateenv.c
@@ -0,0 +1,73 @@
+/* Install given floating-point environment and raise exceptions.
+   Copyright (C) 1997-2025 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>
+#include "arm-features.h"
+
+
+int
+feupdateenv (const fenv_t *envp)
+{
+  fpu_control_t fpscr, new_fpscr, updated_fpscr;
+  int excepts;
+
+  /* Fail if a VFP unit isn't present.  */
+  if (!ARM_HAVE_VFP)
+    return 1;
+
+  _FPU_GETCW (fpscr);
+  excepts = fpscr & FE_ALL_EXCEPT;
+
+  if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV))
+    {
+      /* Merge current exception flags with the saved fenv.  */
+      new_fpscr = envp->__