1 files changed, 146 insertions, 0 deletions

diff --git a/arch/m68k/math-emu/fp_emu.h b/arch/m68k/math-emu/fp_emu.h
new file mode 100644
index 000000000000..1d6edc975d89
--- /dev/null
+++ b/arch/m68k/math-emu/fp_emu.h
@@ -0,0 +1,146 @@
+/*
+ * fp_emu.h
+ *
+ * Copyright Roman Zippel, 1997.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU General Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _FP_EMU_H
+#define _FP_EMU_H
+
+#ifdef __ASSEMBLY__
+#include <asm/offsets.h>
+#endif
+#include <asm/math-emu.h>
+
+#ifndef __ASSEMBLY__
+
+#define IS_INF(a) ((a)->exp == 0x7fff)
+#define IS_ZERO(a) ((a)->mant.m64 == 0)
+
+
+#define fp_set_sr(bit) ({                                       \
+        FPDATA->fpsr |= 1 << (bit);                             \
+})
+
+#define fp_set_quotient(quotient) ({                            \
+        FPDATA->fpsr &= 0xff00ffff;                             \
+        FPDATA->fpsr |= ((quotient) & 0xff) << 16;              \
+})
+
+/* linkage for several useful functions */
+
+/* Normalize the extended struct, return 0 for a NaN */
+#define fp_normalize_ext(fpreg) ({                              \
+        register struct fp_ext *reg asm ("a0") = fpreg;         \
+        register int res asm ("d0");                            \
+                                                                \
+        asm volatile ("jsr fp_conv_ext2ext"                     \
+                        : "=d" (res) : "a" (reg)                \
+                        : "a1", "d1", "d2", "memory");          \
+        res;                                                    \
+})
+
+#define fp_copy_ext(dest, src) ({                               \
+        *dest = *src;                                           \
+})
+
+#define fp_monadic_check(dest, src) ({                          \
+        fp_copy_ext(dest, src);                                 \
+        if (!fp_normalize_ext(dest))                            \
+                return dest;                                    \
+})
+
+#define fp_dyadic_check(dest, src) ({                           \
+        if (!fp_normalize_ext(dest))                            \
+                return dest;                                    \
+        if (!fp_normalize_ext(src)) {                           \
+                fp_copy_ext(dest, src);                         \
+                return dest;                                    \
+        }                                                       \
+})
+
+extern const struct fp_ext fp_QNaN;
+extern const struct fp_ext fp_Inf;
+
+#define fp_set_nan(dest) ({                                     \
+        fp_set_sr(FPSR_EXC_OPERR);                              \
+        *dest = fp_QNaN;                                        \
+})
+
+/* TODO check rounding mode? */
+#define fp_set_ovrflw(dest) ({                                  \
+        fp_set_sr(FPSR_EXC_OVFL);                               \
+        dest->exp = 0x7fff;                                     \
+        dest->mant.m64 = 0;                                     \
+})
+
+#define fp_conv_ext2long(src) ({                                \
+        register struct fp_ext *__src asm ("a0") = src;         \
+        register int __res asm ("d0");                          \
+                                                                \
+        asm volatile ("jsr fp_conv_ext2long"                    \
+                        : "=d" (__res) : "a" (__src)            \
+                        : "a1", "d1", "d2", "memory");          \
+        __res;                                                  \
+})
+
+#define fp_conv_long2ext(dest, src) ({                          \
+        register struct fp_ext *__dest asm ("a0") = dest;       \
+        register int __src asm ("d0") = src;                    \
+                                                                \
+        asm volatile ("jsr fp_conv_ext2long"                    \
+                        : : "d" (__src), "a" (__dest)           \
+                        : "a1", "d1", "d2", "memory");          \
+})
+
+#else /* __ASSEMBLY__ */
+
+/*
+ * set, reset or clear a bit in the fp status register
+ */
+.macro  fp_set_sr       bit
+        bset    #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
+.endm
+
+.macro  fp_clr_sr       bit
+        bclr    #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
+.endm
+
+.macro  fp_tst_sr       bit
+        btst    #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
+.endm
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _FP_EMU_H */