LoongArch: Hard Float Support

22 files changed, 2372 insertions, 0 deletions

diff --git a/sysdeps/loongarch/fpu/fclrexcpt.c b/sysdeps/loongarch/fpu/fclrexcpt.c
new file mode 100644
index 0000000000..e9f33a1658
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fclrexcpt.c
@@ -0,0 +1,46 @@
+/* Clear given exceptions in current floating-point environment.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <fenv_libc.h>
+#include <fpu_control.h>
+
+int
+feclearexcept (int excepts)
+{
+  int cw;
+
+  /* Mask out unsupported bits/exceptions.  */
+  excepts &= FE_ALL_EXCEPT;
+
+  /* Read the complete control word.  */
+  _FPU_GETCW (cw);
+
+  /* Clear exception flag bits and cause bits.  If the cause bit is not
+     cleared, the next CTC instruction (just below) will re-generate the
+     exception.  */
+
+  cw &= ~(excepts | (excepts << CAUSE_SHIFT));
+
+  /* Put the new data in effect.  */
+  _FPU_SETCW (cw);
+
+  /* Success.  */
+  return 0;
+}
+libm_hidden_def (feclearexcept)
diff --git a/sysdeps/loongarch/fpu/fedisblxcpt.c b/sysdeps/loongarch/fpu/fedisblxcpt.c
new file mode 100644
index 0000000000..add62946fd
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fedisblxcpt.c
@@ -0,0 +1,39 @@
+/* Disable floating-point exceptions.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <fenv_libc.h>
+#include <fpu_control.h>
+
+int
+fedisableexcept (int excepts)
+{
+  unsigned int new_exc, old_exc;
+
+  /* Get the current control word.  */
+  _FPU_GETCW (new_exc);
+
+  old_exc = (new_exc & ENABLE_MASK) << ENABLE_SHIFT;
+
+  excepts &= FE_ALL_EXCEPT;
+
+  new_exc &= ~(excepts >> ENABLE_SHIFT);
+  _FPU_SETCW (new_exc);
+
+  return old_exc;
+}
diff --git a/sysdeps/loongarch/fpu/feenablxcpt.c b/sysdeps/loongarch/fpu/feenablxcpt.c
new file mode 100644
index 0000000000..ed809341f6
--- /dev/null
+++ b/sysdeps/loongarch/fpu/feenablxcpt.c
@@ -0,0 +1,39 @@
+/* Enable floating-point exceptions.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <fenv_libc.h>
+#include <fpu_control.h>
+
+int
+feenableexcept (int excepts)
+{
+  unsigned int new_exc, old_exc;
+
+  /* Get the current control word.  */
+  _FPU_GETCW (new_exc);
+
+  old_exc = (new_exc & ENABLE_MASK) << ENABLE_SHIFT;
+
+  excepts &= FE_ALL_EXCEPT;
+
+  new_exc |= excepts >> ENABLE_SHIFT;
+  _FPU_SETCW (new_exc);
+
+  return old_exc;
+}
diff --git a/sysdeps/loongarch/fpu/fegetenv.c b/sysdeps/loongarch/fpu/fegetenv.c
new file mode 100644
index 0000000000..5a2a3d34dc
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fegetenv.c
@@ -0,0 +1,31 @@
+/* Store current floating-point environment.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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
+__fegetenv (fenv_t *envp)
+{
+  _FPU_GETCW (*envp);
+
+  /* Success.  */
+  return 0;
+}
+libm_hidden_def (__fegetenv) weak_alias (__fegetenv, fegetenv)
+libm_hidden_weak (fegetenv)
diff --git a/sysdeps/loongarch/fpu/fegetexcept.c b/sysdeps/loongarch/fpu/fegetexcept.c
new file mode 100644
index 0000000000..ba1c1466f4
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fegetexcept.c
@@ -0,0 +1,32 @@
+/* Get enabled floating-point exceptions.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <fenv_libc.h>
+#include <fpu_control.h>
+
+int
+fegetexcept (void)
+{
+  unsigned int exc;
+
+  /* Get the current control word.  */
+  _FPU_GETCW (exc);
+
+  return (exc & ENABLE_MASK) << ENABLE_SHIFT;
+}
diff --git a/sysdeps/loongarch/fpu/fegetmode.c b/sysdeps/loongarch/fpu/fegetmode.c
new file mode 100644
index 0000000000..e3517e34f6
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fegetmode.c
@@ -0,0 +1,27 @@
+/* Store current floating-point control modes.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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
+fegetmode (femode_t *modep)
+{
+  _FPU_GETCW (*modep);
+  return 0;
+}
diff --git a/sysdeps/loongarch/fpu/fegetround.c b/sysdeps/loongarch/fpu/fegetround.c
new file mode 100644
index 0000000000..ff6113eb04
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fegetround.c
@@ -0,0 +1,33 @@
+/* Return current rounding direction.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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
+__fegetround (void)
+{
+  int cw;
+
+  /* Get control word.  */
+  _FPU_GETCW (cw);
+
+  return cw & _FPU_RC_MASK;
+}
+libm_hidden_def (__fegetround) weak_alias (__fegetround, fegetround)
+libm_hidden_weak (fegetround)
diff --git a/sysdeps/loongarch/fpu/feholdexcpt.c b/sysdeps/loongarch/fpu/feholdexcpt.c
new file mode 100644
index 0000000000..e4f9f6a23b
--- /dev/null
+++ b/sysdeps/loongarch/fpu/feholdexcpt.c
@@ -0,0 +1,40 @@
+/* Store current floating-point environment and clear exceptions.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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
+__feholdexcept (fenv_t *envp)
+{
+  fpu_control_t cw;
+
+  /* Save the current state.  */
+  _FPU_GETCW (cw);
+  envp->__fp_control_register = cw;
+
+  /* Clear all exception enable bits and flags.  */
+  cw &= ~(_FPU_MASK_V | _FPU_MASK_Z | _FPU_MASK_O | _FPU_MASK_U | _FPU_MASK_I
+	  | FE_ALL_EXCEPT);
+  _FPU_SETCW (cw);
+
+  return 0;
+}
+
+libm_hidden_def (__feholdexcept) weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)
diff --git a/sysdeps/loongarch/fpu/fenv_libc.h b/sysdeps/loongarch/fpu/fenv_libc.h
new file mode 100644
index 0000000000..8360ae0377
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fenv_libc.h
@@ -0,0 +1,30 @@
+/* Internal libc stuff for floating point environment routines.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 _FENV_LIBC_H
+#define _FENV_LIBC_H 1
+
+/* Mask for enabling exceptions and for the CAUSE bits.  */
+#define ENABLE_MASK 0x0000001FU
+#define CAUSE_MASK 0x1F000000U
+
+/* Shift for FE_* flags to get up to the ENABLE bits and the CAUSE bits.  */
+#define ENABLE_SHIFT 16
+#define CAUSE_SHIFT 8
+
+#endif /* _FENV_LIBC_H */
diff --git a/sysdeps/loongarch/fpu/fesetenv.c b/sysdeps/loongarch/fpu/fesetenv.c
new file mode 100644
index 0000000000..c10bd11ef9
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fesetenv.c
@@ -0,0 +1,42 @@
+/* Install given floating-point environment.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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
+__fesetenv (const fenv_t *envp)
+{
+  fpu_control_t cw;
+
+  /* Read first current state to flush fpu pipeline.  */
+  _FPU_GETCW (cw);
+
+  if (envp == FE_DFL_ENV)
+    _FPU_SETCW (_FPU_DEFAULT);
+  else if (envp == FE_NOMASK_ENV)
+    _FPU_SETCW (_FPU_IEEE);
+  else
+    _FPU_SETCW (envp->__fp_control_register);
+
+  /* Success.  */
+  return 0;
+}
+
+libm_hidden_def (__fesetenv) weak_alias (__fesetenv, fesetenv)
+libm_hidden_weak (fesetenv)
diff --git a/sysdeps/loongarch/fpu/fesetexcept.c b/sysdeps/loongarch/fpu/fesetexcept.c
new file mode 100644
index 0000000000..ad76d52d9e
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fesetexcept.c
@@ -0,0 +1,32 @@
+/* Set given exception flags.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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
+fesetexcept (int excepts)
+{
+  fpu_control_t temp;
+
+  _FPU_GETCW (temp);
+  temp |= excepts & FE_ALL_EXCEPT;
+  _FPU_SETCW (temp);
+
+  return 0;
+}
diff --git a/sysdeps/loongarch/fpu/fesetmode.c b/sysdeps/loongarch/fpu/fesetmode.c
new file mode 100644
index 0000000000..fc52fc114b
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fesetmode.c
@@ -0,0 +1,38 @@
+/* Install given floating-point control modes.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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>
+
+#define FCSR_STATUS 0x1f1f0000
+
+int
+fesetmode (const femode_t *modep)
+{
+  fpu_control_t cw;
+
+  _FPU_GETCW (cw);
+  cw &= FCSR_STATUS;
+  if (modep == FE_DFL_MODE)
+    cw |= _FPU_DEFAULT;
+  else
+    cw |= *modep & ~FCSR_STATUS;
+  _FPU_SETCW (cw);
+
+  return 0;
+}
diff --git a/sysdeps/loongarch/fpu/fesetround.c b/sysdeps/loongarch/fpu/fesetround.c
new file mode 100644
index 0000000000..32acac5f96
--- /dev/null
+++ b/sysdeps/loongarch/fpu/fesetround.c
@@ -0,0 +1,44 @@
+/* Set current rounding direction.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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
+__fesetround (int round)
+{