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-rw-r--r--sysdeps/arm/fpu/bits/fenv.h58
-rw-r--r--sysdeps/arm/fpu/fclrexcpt.c39
-rw-r--r--sysdeps/arm/fpu/fegetenv.c29
-rw-r--r--sysdeps/arm/fpu/fegetround.c26
-rw-r--r--sysdeps/arm/fpu/fesetenv.c33
-rw-r--r--sysdeps/arm/fpu/fesetround.c27
-rw-r--r--sysdeps/arm/fpu/fraiseexcpt.c32
-rw-r--r--sysdeps/arm/fpu/fsetexcptflag.c38
-rw-r--r--sysdeps/arm/fpu/ftestexcept.c32
-rw-r--r--sysdeps/arm/fpu_control.h61
10 files changed, 367 insertions, 8 deletions
diff --git a/sysdeps/arm/fpu/bits/fenv.h b/sysdeps/arm/fpu/bits/fenv.h
new file mode 100644
index 0000000000..17b9702751
--- /dev/null
+++ b/sysdeps/arm/fpu/bits/fenv.h
@@ -0,0 +1,58 @@
+/* Copyright (C) 1997, 1998 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef _FENV_H
+# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
+#endif
+
+/* Define bits representing exceptions in the FPU status word.  */
+enum 
+  {
+    FE_INVALID = 1,
+#define FE_INVALID FE_INVALID
+    FE_DIVBYZERO = 2,
+#define FE_DIVBYZERO FE_DIVBYZERO
+    FE_OVERFLOW = 4,
+#define FE_OVERFLOW FE_OVERFLOW
+    FE_UNDERFLOW = 8,
+#define FE_UNDERFLOW FE_UNDERFLOW
+  };
+
+/* Amount to shift by to convert an exception to a mask bit.  */
+#define FE_EXCEPTION_SHIFT		16
+
+/* All supported exceptions.  */
+#define FE_ALL_EXCEPT	\
+	(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW)
+
+/* The ARM FPU basically only supports round-to-nearest.  Other rounding
+   modes exist, but you have to encode them in the actual instruction.  */
+#define FE_TONEAREST	0
+
+/* Type representing exception flags. */
+typedef unsigned long fexcept_t;
+
+/* Type representing floating-point environment.  */
+typedef struct
+  {
+    unsigned long cw;
+  }
+fenv_t;
+
+/* If the default argument is used we use this value.  */
+#define FE_DFL_ENV	((fenv_t *) -1l)
diff --git a/sysdeps/arm/fpu/fclrexcpt.c b/sysdeps/arm/fpu/fclrexcpt.c
new file mode 100644
index 0000000000..34ad36dfa8
--- /dev/null
+++ b/sysdeps/arm/fpu/fclrexcpt.c
@@ -0,0 +1,39 @@
+/* Clear given exceptions in current floating-point environment.
+   Copyright (C) 1997, 1998 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <fenv.h>
+#include <fpu_control.h>
+
+void
+feclearexcept (int excepts)
+{
+  unsigned long int temp;
+
+  /* Mask out unsupported bits/exceptions.  */
+  excepts &= FE_ALL_EXCEPT;
+
+  /* Get the current floating point status. */
+  _FPU_GETCW(temp);
+
+  /* Clear the relevant bits.  */
+  temp &= excepts ^ FE_ALL_EXCEPT;
+
+  /* Put the new data in effect.  */
+  _FPU_SETCW(temp);
+}
diff --git a/sysdeps/arm/fpu/fegetenv.c b/sysdeps/arm/fpu/fegetenv.c
new file mode 100644
index 0000000000..5b31c5e644
--- /dev/null
+++ b/sysdeps/arm/fpu/fegetenv.c
@@ -0,0 +1,29 @@
+/* Store current floating-point environment.
+   Copyright (C) 1997, 1998 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <fenv.h>
+#include <fpu_control.h>
+
+void
+fegetenv (fenv_t *envp)
+{
+  unsigned long int temp;
+  _FPU_GETCW(temp);
+  envp->cw = temp;
+}
diff --git a/sysdeps/arm/fpu/fegetround.c b/sysdeps/arm/fpu/fegetround.c
new file mode 100644
index 0000000000..5f354bb4bb
--- /dev/null
+++ b/sysdeps/arm/fpu/fegetround.c
@@ -0,0 +1,26 @@
+/* Return current rounding direction.
+   Copyright (C) 1997, 1998 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <fenv.h>
+
+int
+fegetround (void)
+{
+  return FE_TONEAREST;		/* Easy. :-) */
+}
diff --git a/sysdeps/arm/fpu/fesetenv.c b/sysdeps/arm/fpu/fesetenv.c
new file mode 100644
index 0000000000..b2d3ec5e9f
--- /dev/null
+++ b/sysdeps/arm/fpu/fesetenv.c
@@ -0,0 +1,33 @@
+/* Install given floating-point environment.
+   Copyright (C) 1997, 1998 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <fenv.h>
+#include <fpu_control.h>
+
+void
+fesetenv (const fenv_t *envp)
+{
+  if (envp == FE_DFL_ENV)
+      _FPU_SETCW(_FPU_DEFAULT);
+  else
+    {
+      unsigned long temp = envp->cw;
+      _FPU_SETCW(temp);
+    }
+}
diff --git a/sysdeps/arm/fpu/fesetround.c b/sysdeps/arm/fpu/fesetround.c
new file mode 100644
index 0000000000..7591b397e1
--- /dev/null
+++ b/sysdeps/arm/fpu/fesetround.c
@@ -0,0 +1,27 @@
+/* Set current rounding direction.
+   Copyright (C) 1997, 1998 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <fenv.h>
+
+int
+fesetround (int round)
+{
+  /* We only support FE_TONEAREST, so there is no need for any work.  */
+  return (round == FE_TONEAREST)?1:0;
+}
diff --git a/sysdeps/arm/fpu/fraiseexcpt.c b/sysdeps/arm/fpu/fraiseexcpt.c
new file mode 100644
index 0000000000..0fbfb16c94
--- /dev/null
+++ b/sysdeps/arm/fpu/fraiseexcpt.c
@@ -0,0 +1,32 @@
+/* Raise given exceptions.
+   Copyright (C) 1997, 1998 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <fenv.h>
+#include <fpu_control.h>
+#include <math.h>
+
+void
+feraiseexcept (int excepts)
+{
+  /* Raise exceptions represented by EXPECTS.  */
+  fexcept_t temp;
+  _FPU_GETCW(temp);
+  temp |= (excepts & FE_ALL_EXCEPT);
+  _FPU_SETCW(temp);
+}
diff --git a/sysdeps/arm/fpu/fsetexcptflag.c b/sysdeps/arm/fpu/fsetexcptflag.c
new file mode 100644
index 0000000000..f5c06a6f6c
--- /dev/null
+++ b/sysdeps/arm/fpu/fsetexcptflag.c
@@ -0,0 +1,38 @@
+/* Set floating-point environment exception handling.
+   Copyright (C) 1997, 1998 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <fenv.h>
+#include <math.h>
+#include <fpu_control.h>
+
+void
+fesetexceptflag (const fexcept_t *flagp, int excepts)
+{
+  fexcept_t temp;
+
+  /* Get the current environment.  */
+  _FPU_GETCW(temp);
+
+  /* Set the desired exception mask.  */
+  temp &= ~((excepts & FE_ALL_EXCEPT) << FE_EXCEPT_SHIFT);
+  temp |= (*flagp & excepts & FE_ALL_EXCEPT) << FE_EXCEPT_SHIFT;
+
+  /* Save state back to the FPU.  */
+  _FPU_SETCW(temp);
+}
diff --git a/sysdeps/arm/fpu/ftestexcept.c b/sysdeps/arm/fpu/ftestexcept.c
new file mode 100644
index 0000000000..691d3e1c8e
--- /dev/null
+++ b/sysdeps/arm/fpu/ftestexcept.c
@@ -0,0 +1,32 @@
+/* Test exception in current environment.
+   Copyright (C) 1997, 1998 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <fenv.h>
+#include <fpu_control.h>
+
+int
+fetestexcept (int excepts)
+{
+  fexcept_t temp;
+
+  /* Get current exceptions.  */
+  _FPU_GETCW(temp);
+
+  return temp & excepts & FE_ALL_EXCEPT;
+}
diff --git a/sysdeps/arm/fpu_control.h b/sysdeps/arm/fpu_control.h
index 054085d70a..8a2d338c49 100644
--- a/sysdeps/arm/fpu_control.h
+++ b/sysdeps/arm/fpu_control.h
@@ -1,5 +1,5 @@
-/* FPU control word definitions.  Stub version.
-   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+/* FPU control word definitions.  ARM version.
+   Copyright (C) 1996, 1997, 1998 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
@@ -20,7 +20,54 @@
 #ifndef _FPU_CONTROL_H
 #define _FPU_CONTROL_H
 
-#define _FPU_RESERVED 0xffffffff  /* These bits are reserved.  */
+/* We have a slight terminology confusion here.  On the ARM, the register
+ * we're interested in is actually the FPU status word - the FPU control
+ * word is something different (which is implementation-defined and only
+ * accessible from supervisor mode.)  
+ *
+ * The FPSR looks like this:
+ *
+ *     31-24        23-16          15-8              7-0
+ * | system ID | trap enable | system control | exception flags | 
+ *
+ * We ignore the system ID bits; for interest's sake they are:
+ *
+ *  0000	"old" FPE
+ *  1000	FPPC hardware
+ *  0001	FPE 400
+ *  1001	FPA hardware
+ *
+ * The trap enable and exception flags are both structured like this:
+ *
+ *     7 - 5     4     3     2     1     0
+ * | reserved | INX | UFL | OFL | DVZ | IVO | 
+ *
+ * where a `1' bit in the enable byte means that the trap can occur, and
+ * a `1' bit in the flags byte means the exception has occurred.
+ *
+ * The exceptions are:
+ *
+ *  IVO - invalid operation
+ *  DVZ - divide by zero
+ *  OFL - overflow
+ *  UFL - underflow
+ *  INX - inexact (do not use; implementations differ)
+ *
+ * The system control byte looks like this:
+ *
+ *     7-5      4    3    2    1    0
+ * | reserved | AC | EP | SO | NE | ND |
+ * 
+ * where the bits mean
+ *
+ *  ND - no denormalised numbers (force them all to zero)
+ *  NE - enable NaN exceptions
+ *  SO - synchronous operation
+ *  EP - use expanded packed-decimal format
+ *  AC - use alternate definition for C flag on compare operations
+ */
+
+#define _FPU_RESERVED 0xfff0e0f0  /* These bits are reserved.  */
 
 /* The fdlibm code requires no interrupts for exceptions.  Don't
    change the rounding mode, it would break long double I/O!  */
@@ -29,11 +76,9 @@
 /* Type of the control word.  */
 typedef unsigned int fpu_control_t;
 
-/* Macros for accessing the hardware control word.
- * On the ARM, we can't do this from user mode (it would trap).
- */
-#define _FPU_GETCW(cw) __asm__ ("movnv r0,r0" : "=g" (cw))
-#define _FPU_SETCW(cw) __asm__ ("movnv r0,r0" : : "g" (cw))
+/* Macros for accessing the hardware control word.  */
+#define _FPU_GETCW(cw) __asm__ ("rfs %0" : "=r" (cw))
+#define _FPU_SETCW(cw) __asm__ ("wfs %0" : : "r" (cw))
 
 /* Default control word set at startup.  */
 extern fpu_control_t __fpu_control;
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-12-01 01:01:47 +0000