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authorCarlos O'Donell <carlos@systemhalted.org>2012-11-19 00:37:56 -0500
committerCarlos O'Donell <carlos@systemhalted.org>2012-11-19 00:37:56 -0500
commit030c5d66b80934fa1de9340f47749c8fdfadd8aa (patch)
treef2c2248be7a6c91e32b1e36efb4c11ab98c088f7 /ports
parent0d6bed71502f053fa702ccbb7dd4fa6741b2a0ed (diff)
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hppa: Implement fpu_control.h.
The HP-PARISC processor has full IEEE-754 support and we implement all of fpu_control.h.
Diffstat (limited to 'ports')
-rw-r--r--ports/ChangeLog.hppa2
-rw-r--r--ports/sysdeps/hppa/fpu/fpu_control.h66
2 files changed, 68 insertions, 0 deletions
diff --git a/ports/ChangeLog.hppa b/ports/ChangeLog.hppa
index 71b5e17..3d8e9e6 100644
--- 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
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 */