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diff --git a/arch/mips/math-emu/ieee754.h b/arch/mips/math-emu/ieee754.h
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.
+ *
+ *  Nov 7, 2000
+ *  Modification to allow integration with Linux kernel
+ *
+ *  Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com
+ *  Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
+ */
+#ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H
+#define __ARCH_MIPS_MATH_EMU_IEEE754_H
+
+#include <linux/compiler.h>
+#include <asm/byteorder.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <asm/bitfield.h>
+
+union ieee754dp {
+        struct {
+                __BITFIELD_FIELD(unsigned int sign:1,
+                __BITFIELD_FIELD(unsigned int bexp:11,
+                __BITFIELD_FIELD(u64 mant:52,
+                ;)))
+        };
+        u64 bits;
+};
+
+union ieee754sp {
+        struct {
+                __BITFIELD_FIELD(unsigned sign:1,
+                __BITFIELD_FIELD(unsigned bexp:8,
+                __BITFIELD_FIELD(unsigned mant:23,
+                ;)))
+        };
+        u32 bits;
+};
+
+/*
+ * single precision (often aka float)
+*/
+int ieee754sp_class(union ieee754sp x);
+
+union ieee754sp ieee754sp_abs(union ieee754sp x);
+union ieee754sp ieee754sp_neg(union ieee754sp x);
+
+union ieee754sp ieee754sp_add(union ieee754sp x, union ieee754sp y);
+union ieee754sp ieee754sp_sub(union ieee754sp x, union ieee754sp y);
+union ieee754sp ieee754sp_mul(union ieee754sp x, union ieee754sp y);
+union ieee754sp ieee754sp_div(union ieee754sp x, union ieee754sp y);
+
+union ieee754sp ieee754sp_fint(int x);
+union ieee754sp ieee754sp_flong(s64 x);
+union ieee754sp ieee754sp_fdp(union ieee754dp x);
+union ieee754sp ieee754sp_rint(union ieee754sp x);
+
+int ieee754sp_tint(union ieee754sp x);
+s64 ieee754sp_tlong(union ieee754sp x);
+
+int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig);
+
+union ieee754sp ieee754sp_sqrt(union ieee754sp x);
+
+union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x,
+                                union ieee754sp y);
+union ieee754sp ieee754sp_msubf(union ieee754sp z, union ieee754sp x,
+                                union ieee754sp y);
+union ieee754sp ieee754sp_madd(union ieee754sp z, union ieee754sp x,
+                                union ieee754sp y);
+union ieee754sp ieee754sp_msub(union ieee754sp z, union ieee754sp x,
+                                union ieee754sp y);
+union ieee754sp ieee754sp_nmadd(union ieee754sp z, union ieee754sp x,
+                                union ieee754sp y);
+union ieee754sp ieee754sp_nmsub(union ieee754sp z, union ieee754sp x,
+                                union ieee754sp y);
+int ieee754sp_2008class(union ieee754sp x);
+union ieee754sp ieee754sp_fmin(union ieee754sp x, union ieee754sp y);
+union ieee754sp ieee754sp_fmina(union ieee754sp x, union ieee754sp y);
+union ieee754sp ieee754sp_fmax(union ieee754sp x, union ieee754sp y);
+union ieee754sp ieee754sp_fmaxa(union ieee754sp x, union ieee754sp y);
+
+/*
+ * double precision (often aka double)
+*/
+int ieee754dp_class(union ieee754dp x);
+
+union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y);
+union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y);
+union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y);
+union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y);
+
+union ieee754dp ieee754dp_abs(union ieee754dp x);
+union ieee754dp ieee754dp_neg(union ieee754dp x);
+
+union ieee754dp ieee754dp_fint(int x);
+union ieee754dp ieee754dp_flong(s64 x);
+union ieee754dp ieee754dp_fsp(union ieee754sp x);
+union ieee754dp ieee754dp_rint(union ieee754dp x);
+
+int ieee754dp_tint(union ieee754dp x);
+s64 ieee754dp_tlong(union ieee754dp x);
+
+int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig);
+
+union ieee754dp ieee754dp_sqrt(union ieee754dp x);
+
+union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x,
+                                union ieee754dp y);
+union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x,
+                                union ieee754dp y);
+union ieee754dp ieee754dp_madd(union ieee754dp z, union ieee754dp x,
+                                union ieee754dp y);
+union ieee754dp ieee754dp_msub(union ieee754dp z, union ieee754dp x,
+                                union ieee754dp y);
+union ieee754dp ieee754dp_nmadd(union ieee754dp z, union ieee754dp x,
+                                union ieee754dp y);
+union ieee754dp ieee754dp_nmsub(union ieee754dp z, union ieee754dp x,
+                                union ieee754dp y);
+int ieee754dp_2008class(union ieee754dp x);
+union ieee754dp ieee754dp_fmin(union ieee754dp x, union ieee754dp y);
+union ieee754dp ieee754dp_fmina(union ieee754dp x, union ieee754dp y);
+union ieee754dp ieee754dp_fmax(union ieee754dp x, union ieee754dp y);
+union ieee754dp ieee754dp_fmaxa(union ieee754dp x, union ieee754dp y);
+
+
+/* 5 types of floating point number
+*/
+enum {
+        IEEE754_CLASS_NORM      = 0x00,
+        IEEE754_CLASS_ZERO      = 0x01,
+        IEEE754_CLASS_DNORM     = 0x02,
+        IEEE754_CLASS_INF       = 0x03,
+        IEEE754_CLASS_SNAN      = 0x04,
+        IEEE754_CLASS_QNAN      = 0x05,
+};
+
+/* exception numbers */
+#define IEEE754_INEXACT                 0x01
+#define IEEE754_UNDERFLOW               0x02
+#define IEEE754_OVERFLOW                0x04
+#define IEEE754_ZERO_DIVIDE             0x08
+#define IEEE754_INVALID_OPERATION       0x10
+
+/* cmp operators
+*/
+#define IEEE754_CLT     0x01
+#define IEEE754_CEQ     0x02
+#define IEEE754_CGT     0x04
+#define IEEE754_CUN     0x08
+
+/*
+ * The control status register
+ */
+struct _ieee754_csr {
+        __BITFIELD_FIELD(unsigned fcc:7,        /* condition[7:1] */
+        __BITFIELD_FIELD(unsigned nod:1,        /* set 1 for no denormals */
+        __BITFIELD_FIELD(unsigned c:1,          /* condition[0] */
+        __BITFIELD_FIELD(unsigned pad0:3,
+        __BITFIELD_FIELD(unsigned abs2008:1,    /* IEEE 754-2008 ABS/NEG.fmt */
+        __BITFIELD_FIELD(unsigned nan2008:1,    /* IEEE 754-2008 NaN mode */
+        __BITFIELD_FIELD(unsigned cx:6,         /* exceptions this operation */
+        __BITFIELD_FIELD(unsigned mx:5,         /* exception enable  mask */
+        __BITFIELD_FIELD(unsigned sx:5,         /* exceptions total */
+        __BITFIELD_FIELD(unsigned rm:2,         /* current rounding mode */
+        ;))))))))))
+};
+#define ieee754_csr (*(struct _ieee754_csr *)(&current->thread.fpu.fcr31))
+
+static inline unsigned int ieee754_getrm(void)
+{
+        return (ieee754_csr.rm);
+}
+
+static inline unsigned int ieee754_setrm(unsigned int rm)
+{
+        return (ieee754_csr.rm = rm);
+}
+
+/*
+ * get current exceptions
+ */
+static inline unsigned int ieee754_getcx(void)
+{
+        return (ieee754_csr.cx);
+}
+
+/* test for current exception condition
+ */
+static inline int ieee754_cxtest(unsigned int n)
+{
+        return (ieee754_csr.cx & n);
+}
+
+/*
+ * get sticky exceptions
+ */
+static inline unsigned int ieee754_getsx(void)
+{
+        return (ieee754_csr.sx);
+}
+
+/* clear sticky conditions
+*/
+static inline unsigned int ieee754_clrsx(void)
+{
+        return (ieee754_csr.sx = 0);
+}
+
+/* test for sticky exception condition
+ */
+static inline int ieee754_sxtest(unsigned int n)
+{
+        return (ieee754_csr.sx & n);
+}
+
+/* debugging */
+union ieee754sp ieee754sp_dump(char *s, union ieee754sp x);
+union ieee754dp ieee754dp_dump(char *s, union ieee754dp x);
+
+#define IEEE754_SPCVAL_PZERO            0       /* +0.0 */
+#define IEEE754_SPCVAL_NZERO            1       /* -0.0 */
+#define IEEE754_SPCVAL_PONE             2       /* +1.0 */
+#define IEEE754_SPCVAL_NONE             3       /* -1.0 */
+#define IEEE754_SPCVAL_PTEN             4       /* +10.0 */
+#define IEEE754_SPCVAL_NTEN             5       /* -10.0 */
+#define IEEE754_SPCVAL_PINFINITY        6       /* +inf */
+#define IEEE754_SPCVAL_NINFINITY        7       /* -inf */
+#define IEEE754_SPCVAL_INDEF_LEG        8       /* legacy quiet NaN */
+#define IEEE754_SPCVAL_INDEF_2008       9       /* IEEE 754-2008 quiet NaN */
+#define IEEE754_SPCVAL_PMAX             10      /* +max norm */
+#define IEEE754_SPCVAL_NMAX             11      /* -max norm */
+#define IEEE754_SPCVAL_PMIN             12      /* +min norm */
+#define IEEE754_SPCVAL_NMIN             13      /* -min norm */
+#define IEEE754_SPCVAL_PMIND            14      /* +min denorm */
+#define IEEE754_SPCVAL_NMIND            15      /* -min denorm */
+#define IEEE754_SPCVAL_P1E31            16      /* + 1.0e31 */
+#define IEEE754_SPCVAL_P1E63            17      /* + 1.0e63 */
+
+extern const union ieee754dp __ieee754dp_spcvals[];
+extern const union ieee754sp __ieee754sp_spcvals[];
+#define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals)
+#define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals)
+
+/*
+ * Return infinity with given sign
+ */
+#define ieee754dp_inf(sn)     (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
+#define ieee754dp_zero(sn)      (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
+#define ieee754dp_one(sn)       (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
+#define ieee754dp_ten(sn)       (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
+#define ieee754dp_indef()       (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \
+                                                   ieee754_csr.nan2008])
+#define ieee754dp_max(sn)       (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
+#define ieee754dp_min(sn)       (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
+#define ieee754dp_mind(sn)      (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
+#define ieee754dp_1e31()        (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
+#define ieee754dp_1e63()        (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
+
+#define ieee754sp_inf(sn)     (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
+#define ieee754sp_zero(sn)      (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
+#define ieee754sp_one(sn)       (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
+#define ieee754sp_ten(sn)       (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
+#define ieee754sp_indef()       (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \
+                                                   ieee754_csr.nan2008])
+#define ieee754sp_max(sn)       (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
+#define ieee754sp_min(sn)       (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
+#define ieee754sp_mind(sn)      (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
+#define ieee754sp_1e31()        (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
+#define ieee754sp_1e63()        (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
+
+/*
+ * Indefinite integer value
+ */
+static inline int ieee754si_indef(void)
+{
+        return ieee754_csr.nan2008 ? 0 : INT_MAX;
+}
+
+static inline s64 ieee754di_indef(void)
+{
+        return ieee754_csr.nan2008 ? 0 : S64_MAX;
+}
+
+/*
+ * Overflow integer value
+ */
+static inline int ieee754si_overflow(int xs)
+{
+        return ieee754_csr.nan2008 && xs ? INT_MIN : INT_MAX;
+}
+
+static inline s64 ieee754di_overflow(int xs)
+{
+        return ieee754_csr.nan2008 && xs ? S64_MIN : S64_MAX;
+}
+
+/* result types for xctx.rt */
+#define IEEE754_RT_SP   0
+#define IEEE754_RT_DP   1
+#define IEEE754_RT_XP   2
+#define IEEE754_RT_SI   3
+#define IEEE754_RT_DI   4
+
+/* compat */
+#define ieee754dp_fix(x)        ieee754dp_tint(x)
+#define ieee754sp_fix(x)        ieee754sp_tint(x)
+
+#endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */