hppa: Implement fpu_control.h.

The HP-PARISC processor has full IEEE-754 support
and we implement all of fpu_control.h.

diff --git a/ports/ChangeLog.hppa b/ports/ChangeLog.hppa
index 71b5e17..3d8e9e6 100644 (file)
--- a/ports/ChangeLog.hppa
+++ b/ports/ChangeLog.hppa
@@ -1,5 +1,7 @@
 2012-11-18  Carlos O'Donell  <carlos@systemhalted.org>
 
+       * ports/sysdeps/hppa/fpu/fpu_control.h: New file.
+
        * ports/sysdeps/hppa/__longjmp.S: Removed.
        * ports/sysdeps/hppa/__longjmp.c: New file.
        * ports/sysdeps/unix/sysv/linux/hppa/____longjmp_chk.c: New file.

diff --git a/ports/sysdeps/hppa/fpu/fpu_control.h b/ports/sysdeps/hppa/fpu/fpu_control.h
new file mode 100644 (file)
index 0000000..6069797
--- /dev/null
+++ b/ports/sysdeps/hppa/fpu/fpu_control.h
@@ -0,0 +1,66 @@
+/* FPU control word definitions.  HP-PARISC version.
+   Copyright (C) 2012 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _FPU_CONTROL_H
+#define _FPU_CONTROL_H
+
+/* Masking of interrupts */
+#define _FPU_MASK_PM   0x00000001      /* Inexact (I) */
+#define _FPU_MASK_UM   0x00000002      /* Underflow (U) */
+#define _FPU_MASK_OM   0x00000004      /* Overflow (O) */
+#define _FPU_MASK_ZM   0x00000008      /* Divide by zero (Z) */
+#define _FPU_MASK_IM   0x00000010      /* Invalid operation (V) */
+
+/* Masking of rounding modes.  */
+#define _FPU_HPPA_MASK_RM      0x00000600      /* Rounding mode mask */
+/* Masking of interrupt enable bits.  */
+#define _FPU_HPPA_MASK_INT     0x0000001f      /* Interrupt mask */
+
+/* There are no reserved bits in the PA fpsr (though some are undefined).  */
+#define _FPU_RESERVED  0x00000000
+/* Default is: No traps enabled, no flags set, round to nearest.  */
+#define _FPU_DEFAULT    0x00000000
+/* Default + exceptions (FE_ALL_EXCEPT) enabled. */
+#define _FPU_IEEE      (_FPU_DEFAULT | _FPU_HPPA_MASK_INT)
+
+/* Type of the control word.  */
+typedef unsigned int fpu_control_t;
+
+/* Macros for accessing the hardware control word.  */
+#define _FPU_GETCW(cw) \
+({                                                                             \
+  union { unsigned long long __fpreg; unsigned int __halfreg[2]; } __fullfp;   \
+  /* Get the current status word. */                                           \
+  __asm__ ("fstd %%fr0,0(%1)\n\t"                                              \
+           "fldd 0(%1),%%fr0\n\t"                                              \
+          : "=m" (__fullfp.__fpreg) : "r" (&__fullfp.__fpreg) : "%r0");        \
+  __fullfp.__halfreg[0];                                                       \
+})
+
+#define _FPU_SETCW(cw) \
+({                                                                             \
+  union { unsigned long long __fpreg; unsigned int __halfreg[2]; } __fullfp;   \
+  __fullfp.__halfreg[0] = cw;                                                  \
+  __asm__ ("fldd 0(%1),%%fr0\n\t"                                              \
+          : : "m" (__fullfp.__fpreg), "r" (__fullfp.__fpreg) : "%r0" );        \
+})
+
+/* Default control word set at startup.  */
+extern fpu_control_t __fpu_control;
+
+#endif /* _FPU_CONTROL_H */