Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1220 insertions, 0 deletions

diff --git a/arch/x86/math-emu/reg_ld_str.c b/arch/x86/math-emu/reg_ld_str.c
new file mode 100644
index 000000000..d40ff4549
--- /dev/null
+++ b/arch/x86/math-emu/reg_ld_str.c
@@ -0,0 +1,1220 @@
+// SPDX-License-Identifier: GPL-2.0
+/*---------------------------------------------------------------------------+
+ |  reg_ld_str.c                                                             |
+ |                                                                           |
+ | All of the functions which transfer data between user memory and FPU_REGs.|
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1996,1997                                    |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | Note:                                                                     |
+ |    The file contains code which accesses user memory.                     |
+ |    Emulator static data may change when user memory is accessed, due to   |
+ |    other processes using the emulator while swapping is in progress.      |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_emu.h"
+
+#include <linux/uaccess.h>
+
+#include "fpu_system.h"
+#include "exception.h"
+#include "reg_constant.h"
+#include "control_w.h"
+#include "status_w.h"
+
+#define DOUBLE_Emax 1023	/* largest valid exponent */
+#define DOUBLE_Ebias 1023
+#define DOUBLE_Emin (-1022)	/* smallest valid exponent */
+
+#define SINGLE_Emax 127		/* largest valid exponent */
+#define SINGLE_Ebias 127
+#define SINGLE_Emin (-126)	/* smallest valid exponent */
+
+static u_char normalize_no_excep(FPU_REG *r, int exp, int sign)
+{
+	u_char tag;
+
+	setexponent16(r, exp);
+
+	tag = FPU_normalize_nuo(r);
+	stdexp(r);
+	if (sign)
+		setnegative(r);
+
+	return tag;
+}
+
+int FPU_tagof(FPU_REG *ptr)
+{
+	int exp;
+
+	exp = exponent16(ptr) & 0x7fff;
+	if (exp == 0) {
+		if (!(ptr->sigh | ptr->sigl)) {
+			return TAG_Zero;
+		}
+		/* The number is a de-normal or pseudodenormal. */
+		return TAG_Special;
+	}
+
+	if (exp == 0x7fff) {
+		/* Is an Infinity, a NaN, or an unsupported data type. */
+		return TAG_Special;
+	}
+
+	if (!(ptr->sigh & 0x80000000)) {
+		/* Unsupported data type. */
+		/* Valid numbers have the ms bit set to 1. */
+		/* Unnormal. */
+		return TAG_Special;
+	}
+
+	return TAG_Valid;
+}
+
+/* Get a long double from user memory */
+int FPU_load_extended(long double __user *s, int stnr)
+{
+	FPU_REG *sti_ptr = &st(stnr);
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_READ, s, 10);
+	__copy_from_user(sti_ptr, s, 10);
+	RE_ENTRANT_CHECK_ON;
+
+	return FPU_tagof(sti_ptr);
+}
+
+/* Get a double from user memory */
+int FPU_load_double(double __user *dfloat, FPU_REG *loaded_data)
+{
+	int exp, tag, negative;
+	unsigned m64, l64;
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_READ, dfloat, 8);
+	FPU_get_user(m64, 1 + (unsigned long __user *)dfloat);
+	FPU_get_user(l64, (unsigned long __user *)dfloat);
+	RE_ENTRANT_CHECK_ON;
+
+	negative = (m64 & 0x80000000) ? SIGN_Negative : SIGN_Positive;
+	exp = ((m64 & 0x7ff00000) >> 20) - DOUBLE_Ebias + EXTENDED_Ebias;
+	m64 &= 0xfffff;
+	if (exp > DOUBLE_Emax + EXTENDED_Ebias) {
+		/* Infinity or NaN */
+		if ((m64 == 0) && (l64 == 0)) {
+			/* +- infinity */
+			loaded_data->sigh = 0x80000000;
+			loaded_data->sigl = 0x00000000;
+			exp = EXP_Infinity + EXTENDED_Ebias;
+			tag = TAG_Special;
+		} else {
+			/* Must be a signaling or quiet NaN */
+			exp = EXP_NaN + EXTENDED_Ebias;
+			loaded_data->sigh = (m64 << 11) | 0x80000000;
+			loaded_data->sigh |= l64 >> 21;
+			loaded_data->sigl = l64 << 11;
+			tag = TAG_Special;	/* The calling function must look for NaNs */
+		}
+	} else if (exp < DOUBLE_Emin + EXTENDED_Ebias) {
+		/* Zero or de-normal */
+		if ((m64 == 0) && (l64 == 0)) {
+			/* Zero */
+			reg_copy(&CONST_Z, loaded_data);
+			exp = 0;
+			tag = TAG_Zero;
+		} else {
+			/* De-normal */
+			loaded_data->sigh = m64 << 11;
+			loaded_data->sigh |= l64 >> 21;
+			loaded_data->sigl = l64 << 11;
+
+			return normalize_no_excep(loaded_data, DOUBLE_Emin,
+						  negative)
+			    | (denormal_operand() < 0 ? FPU_Exception : 0);
+		}
+	} else {
+		loaded_data->sigh = (m64 << 11) | 0x80000000;
+		loaded_data->sigh |= l64 >> 21;
+		loaded_data->sigl = l64 << 11;
+
+		tag = TAG_Valid;
+	}
+
+	setexponent16(loaded_data, exp | negative);
+
+	return tag;
+}
+
+/* Get a float from user memory */
+int FPU_load_single(float __user *single, FPU_REG *loaded_data)
+{
+	unsigned m32;
+	int exp, tag, negative;
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_READ, single, 4);
+	FPU_get_user(m32, (unsigned long __user *)single);
+	RE_ENTRANT_CHECK_ON;
+
+	negative = (m32 & 0x80000000) ? SIGN_Negative : SIGN_Positive;
+
+	if (!(m32 & 0x7fffffff)) {
+		/* Zero */
+		reg_copy(&CONST_Z, loaded_data);
+		addexponent(loaded_data, negative);
+		return TAG_Zero;
+	}
+	exp = ((m32 & 0x7f800000) >> 23) - SINGLE_Ebias + EXTENDED_Ebias;
+	m32 = (m32 & 0x7fffff) << 8;
+	if (exp < SINGLE_Emin + EXTENDED_Ebias) {
+		/* De-normals */
+		loaded_data->sigh = m32;
+		loaded_data->sigl = 0;
+
+		return normalize_no_excep(loaded_data, SINGLE_Emin, negative)
+		    | (denormal_operand() < 0 ? FPU_Exception : 0);
+	} else if (exp > SINGLE_Emax + EXTENDED_Ebias) {
+		/* Infinity or NaN */
+		if (m32 == 0) {
+			/* +- infinity */
+			loaded_data->sigh = 0x80000000;
+			loaded_data->sigl = 0x00000000;
+			exp = EXP_Infinity + EXTENDED_Ebias;
+			tag = TAG_Special;
+		} else {
+			/* Must be a signaling or quiet NaN */
+			exp = EXP_NaN + EXTENDED_Ebias;
+			loaded_data->sigh = m32 | 0x80000000;
+			loaded_data->sigl = 0;
+			tag = TAG_Special;	/* The calling function must look for NaNs */
+		}
+	} else {
+		loaded_data->sigh = m32 | 0x80000000;
+		loaded_data->sigl = 0;
+		tag = TAG_Valid;
+	}
+
+	setexponent16(loaded_data, exp | negative);	/* Set the sign. */
+
+	return tag;
+}
+
+/* Get a long long from user memory */
+int FPU_load_int64(long long __user *_s)
+{
+	long long s;
+	int sign;
+	FPU_REG *st0_ptr = &st(0);
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_READ, _s, 8);
+	if (copy_from_user(&s, _s, 8))
+		FPU_abort;
+	RE_ENTRANT_CHECK_ON;
+
+	if (s == 0) {
+		reg_copy(&CONST_Z, st0_ptr);
+		return TAG_Zero;
+	}
+
+	if (s > 0)
+		sign = SIGN_Positive;
+	else {
+		s = -s;
+		sign = SIGN_Negative;
+	}
+
+	significand(st0_ptr) = s;
+
+	return normalize_no_excep(st0_ptr, 63, sign);
+}
+
+/* Get a long from user memory */
+int FPU_load_int32(long __user *_s, FPU_REG *loaded_data)
+{
+	long s;
+	int negative;
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_READ, _s, 4);
+	FPU_get_user(s, _s);
+	RE_ENTRANT_CHECK_ON;
+
+	if (s == 0) {
+		reg_copy(&CONST_Z, loaded_data);
+		return TAG_Zero;
+	}
+
+	if (s > 0)
+		negative = SIGN_Positive;
+	else {
+		s = -s;
+		negative = SIGN_Negative;
+	}
+
+	loaded_data->sigh = s;
+	loaded_data->sigl = 0;
+
+	return normalize_no_excep(loaded_data, 31, negative);
+}
+
+/* Get a short from user memory */
+int FPU_load_int16(short __user *_s, FPU_REG *loaded_data)
+{
+	int s, negative;
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_READ, _s, 2);
+	/* Cast as short to get the sign extended. */
+	FPU_get_user(s, _s);
+	RE_ENTRANT_CHECK_ON;
+
+	if (s == 0) {
+		reg_copy(&CONST_Z, loaded_data);
+		return TAG_Zero;
+	}
+
+	if (s > 0)
+		negative = SIGN_Positive;
+	else {
+		s = -s;
+		negative = SIGN_Negative;
+	}
+
+	loaded_data->sigh = s << 16;
+	loaded_data->sigl = 0;
+
+	return normalize_no_excep(loaded_data, 15, negative);
+}
+
+/* Get a packed bcd array from user memory */
+int FPU_load_bcd(u_char __user *s)
+{
+	FPU_REG *st0_ptr = &st(0);
+	int pos;
+	u_char bcd;
+	long long l = 0;
+	int sign;
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_READ, s, 10);
+	RE_ENTRANT_CHECK_ON;
+	for (pos = 8; pos >= 0; pos--) {
+		l *= 10;
+		RE_ENTRANT_CHECK_OFF;
+		FPU_get_user(bcd, s + pos);
+		RE_ENTRANT_CHECK_ON;
+		l += bcd >> 4;
+		l *= 10;
+		l += bcd & 0x0f;
+	}
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_get_user(sign, s + 9);
+	sign = sign & 0x80 ? SIGN_Negative : SIGN_Positive;
+	RE_ENTRANT_CHECK_ON;
+
+	if (l == 0) {
+		reg_copy(&CONST_Z, st0_ptr);
+		addexponent(st0_ptr, sign);	/* Set the sign. */
+		return TAG_Zero;
+	} else {
+		significand(st0_ptr) = l;
+		return normalize_no_excep(st0_ptr, 63, sign);
+	}
+}
+
+/*===========================================================================*/
+
+/* Put a long double into user memory */
+int FPU_store_extended(FPU_REG *st0_ptr, u_char st0_tag,
+		       long double __user * d)
+{
+	/*
+	   The only exception raised by an attempt to store to an
+	   extended format is the Invalid Stack exception, i.e.
+	   attempting to store from an empty register.
+	 */
+
+	if (st0_tag != TAG_Empty) {
+		RE_ENTRANT_CHECK_OFF;
+		FPU_access_ok(VERIFY_WRITE, d, 10);
+
+		FPU_put_user(st0_ptr->sigl, (unsigned long __user *)d);
+		FPU_put_user(st0_ptr->sigh,
+			     (unsigned long __user *)((u_char __user *) d + 4));
+		FPU_put_user(exponent16(st0_ptr),
+			     (unsigned short __user *)((u_char __user *) d +
+						       8));
+		RE_ENTRANT_CHECK_ON;
+
+		return 1;
+	}
+
+	/* Empty register (stack underflow) */
+	EXCEPTION(EX_StackUnder);
+	if (control_word & CW_Invalid) {
+		/* The masked response */
+		/* Put out the QNaN indefinite */
+		RE_ENTRANT_CHECK_OFF;
+		FPU_access_ok(VERIFY_WRITE, d, 10);
+		FPU_put_user(0, (unsigned long __user *)d);
+		FPU_put_user(0xc0000000, 1 + (unsigned long __user *)d);
+		FPU_put_user(0xffff, 4 + (short __user *)d);
+		RE_ENTRANT_CHECK_ON;
+		return 1;
+	} else
+		return 0;
+
+}
+
+/* Put a double into user memory */
+int FPU_store_double(FPU_REG *st0_ptr, u_char st0_tag, double __user *dfloat)
+{
+	unsigned long l[2];
+	unsigned long increment = 0;	/* avoid gcc warnings */
+	int precision_loss;
+	int exp;
+	FPU_REG tmp;
+
+	l[0] = 0;
+	l[1] = 0;
+	if (st0_tag == TAG_Valid) {
+		reg_copy(st0_ptr, &tmp);
+		exp = exponent(&tmp);
+
+		if (exp < DOUBLE_Emin) {	/* It may be a denormal */
+			addexponent(&tmp, -DOUBLE_Emin + 52);	/* largest exp to be 51 */
+denormal_arg:
+			if ((precision_loss = FPU_round_to_int(&tmp, st0_tag))) {
+#ifdef PECULIAR_486
+				/* Did it round to a non-denormal ? */
+				/* This behaviour might be regarded as peculiar, it appears
+				   that the 80486 rounds to the dest precision, then
+				   converts to decide underflow. */
+				if (!
+				    ((tmp.sigh == 0x00100000) && (tmp.sigl == 0)
+				     && (st0_ptr->sigl & 0x000007ff)))
+#endif /* PECULIAR_486 */
+				{
+					EXCEPTION(EX_Underflow);
+					/* This is a special case: see sec 16.2.5.1 of
+					   the 80486 book */
+					if (!(control_word & CW_Underflow))
+						return 0;
+				}
+				EXCEPTION(precision_loss);
+				if (!(control_word & CW_Precision))
+					return 0;
+			}
+			l[0] = tmp.sigl;
+			l[1] = tmp.sigh;
+		} else {
+			if (tmp.sigl & 0x000007ff) {
+				precision_loss = 1;
+				switch (control_word & CW_RC) {
+				case RC_RND:
+					/* Rounding can get a little messy.. */
+					increment = ((tmp.sigl & 0x7ff) > 0x400) |	/* nearest */
+					    ((tmp.sigl & 0xc00) == 0xc00);	/* odd -> even */
+					break;
+				case RC_DOWN:	/* towards -infinity */
+					increment =
+					    signpositive(&tmp) ? 0 : tmp.
+					    sigl & 0x7ff;
+					break;
+				case RC_UP:	/* towards +infinity */
+					increment =
+					    signpositive(&tmp) ? tmp.
+					    sigl & 0x7ff : 0;
+					break;
+				case RC_CHOP:
+					increment = 0;
+					break;
+				}
+
+				/* Truncate the mantissa */
+				tmp.sigl &= 0xfffff800;
+
+				if (increment) {
+					if (tmp.sigl >= 0xfffff800) {
+						/* the sigl part overflows */
+						if (tmp.sigh == 0xffffffff) {
+							/* The sigh part overflows */
+							tmp.sigh = 0x80000000;
+							exp++;
+							if (exp >= EXP_OVER)
+								goto overflow;
+						} else {
+							tmp.sigh++;
+						}
+						tmp.sigl = 0x00000000;
+					} else {
+						/* We only need to increment sigl */
+						tmp.sigl += 0x00000800;
+					}
+				}
+			} else
+				precision_loss = 0;
+
+			l[0] = (tmp.sigl >> 11) | (tmp.sigh << 21);
+			l[1] = ((tmp.sigh >> 11) & 0xfffff);
+
+			if (exp > DOUBLE_Emax) {
+			      overflow:
+				EXCEPTION(EX_Overflow);
+				if (!(control_word & CW_Overflow))
+					return 0;
+				set_precision_flag_up();
+				if (!(control_word & CW_Precision))
+					return 0;
+
+				/* This is a special case: see sec 16.2.5.1 of the 80486 book */
+				/* Overflow to infinity */
+				l[1] = 0x7ff00000;	/* Set to + INF */
+			} else {
+				if (precision_loss) {
+					if (increment)
+						set_precision_flag_up();
+					else
+						set_precision_flag_down();
+				}
+				/* Add the exponent */
+				l[1] |= (((exp + DOUBLE_Ebias) & 0x7ff) << 20);
+			}
+		}
+	} else if (st0_tag == TAG_Zero) {
+		/* Number is zero */
+	} else if (st0_tag == TAG_Special) {
+		st0_tag = FPU_Special(st0_ptr);
+		if (st0_tag == TW_Denormal) {
+			/* A denormal will always underflow. */
+#ifndef PECULIAR_486
+			/* An 80486 is supposed to be able to generate
+			   a denormal exception here, but... */
+			/* Underflow has priority. */
+			if (control_word & CW_Underflow)
+				denormal_operand();
+#endif /* PECULIAR_486 */
+			reg_copy(st0_ptr, &tmp);
+			goto denormal_arg;
+		} else if (st0_tag == TW_Infinity) {
+			l[1] = 0x7ff00000;
+		} else if (st0_tag == TW_NaN) {
+			/* Is it really a NaN ? */
+			if ((exponent(st0_ptr) == EXP_OVER)
+			    && (st0_ptr->sigh & 0x80000000)) {
+				/* See if we can get a valid NaN from the FPU_REG */
+				l[0] =
+				    (st0_ptr->sigl >> 11) | (st0_ptr->
+							     sigh << 21);
+				l[1] = ((st0_ptr->sigh >> 11) & 0xfffff);
+				if (!(st0_ptr->sigh & 0x40000000)) {
+					/* It is a signalling NaN */
+					EXCEPTION(EX_Invalid);
+					if (!(control_word & CW_Invalid))
+						return 0;
+					l[1] |= (0x40000000 >> 11);
+				}
+				l[1] |= 0x7ff00000;
+			} else {
+				/* It is an unsupported data type */
+				EXCEPTION(EX_Invalid);
+				if (!(control_word & CW_Invalid))
+					return 0;
+				l[1] = 0xfff80000;
+			}
+		}
+	} else if (st0_tag == TAG_Empty) {
+		/* Empty register (stack underflow) */
+		EXCEPTION(EX_StackUnder);
+		if (control_word & CW_Invalid) {
+			/* The masked response */
+			/* Put out the QNaN indefinite */
+			RE_ENTRANT_CHECK_OFF;
+			FPU_access_ok(VERIFY_WRITE, dfloat, 8);
+			FPU_put_user(0, (unsigned long __user *)dfloat);
+			FPU_put_user(0xfff80000,
+				     1 + (unsigned long __user *)dfloat);
+			RE_ENTRANT_CHECK_ON;
+			return 1;
+		} else
+			return 0;
+	}
+	if (getsign(st0_ptr))
+		l[1] |= 0x80000000;
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_WRITE, dfloat, 8);
+	FPU_put_user(l[0], (unsigned long __user *)dfloat);
+	FPU_put_user(l[1], 1 + (unsigned long __user *)dfloat);
+	RE_ENTRANT_CHECK_ON;
+
+	return 1;
+}
+
+/* Put a float into user memory */
+int FPU_store_single(FPU_REG *st0_ptr, u_char st0_tag, float __user *single)
+{
+	long templ = 0;
+	unsigned long increment = 0;	/* avoid gcc warnings */
+	int precision_loss;
+	int exp;
+	FPU_REG tmp;
+
+	if (st0_tag == TAG_Valid) {
+
+		reg_copy(st0_ptr, &tmp);
+		exp = exponent(&tmp);
+
+		if (exp < SINGLE_Emin) {
+			addexponent(&tmp, -SINGLE_Emin + 23);	/* largest exp to be 22 */
+
+		      denormal_arg:
+
+			if ((precision_loss = FPU_round_to_int(&tmp, st0_tag))) {
+#ifdef PECULIAR_486
+				/* Did it round to a non-denormal ? */
+				/* This behaviour might be regarded as peculiar, it appears
+				   that the 80486 rounds to the dest precision, then
+				   converts to decide underflow. */
+				if (!((tmp.sigl == 0x00800000) &&
+				      ((st0_ptr->sigh & 0x000000ff)
+				       || st0_ptr->sigl)))
+#endif /* PECULIAR_486 */
+				{
+					EXCEPTION(EX_Underflow);
+					/* This is a special case: see sec 16.2.5.1 of
+					   the 80486 book */
+					if (!(control_word & CW_Underflow))
+						return 0;
+				}
+				EXCEPTION(precision_loss);
+				if (!(control_word & CW_Precision))
+					return 0;
+			}
+			templ = tmp.sigl;
+		} else {
+			if (tmp.sigl | (tmp.sigh & 0x000000ff)) {
+				unsigned long sigh = tmp.sigh;
+				unsigned long sigl = tmp.sigl;
+
+				precision_loss = 1;
+				switch (control_word & CW_RC) {
+				case RC_RND:
+					increment = ((sigh & 0xff) > 0x80)	/* more than half */
+					    ||(((sigh & 0xff) == 0x80) && sigl)	/* more than half */
+					    ||((sigh & 0x180) == 0x180);	/* round to even */
+					break;
+				case RC_DOWN:	/* towards -infinity */
+					increment = signpositive(&tmp)
+					    ? 0 : (sigl | (sigh & 0xff));
+					break;
+				case RC_UP:	/* towards +infinity */
+					increment = signpositive(&tmp)
+					    ? (sigl | (sigh & 0xff)) : 0;
+					break;
+				case RC_CHOP:
+					increment = 0;
+					break;
+				}
+
+				/* Truncate part of the mantissa */
+				tmp.sigl = 0;
+
+				if (increment) {
+					if (sigh >= 0xffffff00) {
+						/* The sigh part overflows */
+						tmp.sigh = 0x80000000;
+						exp++;
+						if (exp >= EXP_OVER)
+							goto overflow;
+					} else {
+						tmp.sigh &= 0xffffff00;
+						tmp.sigh += 0x100;
+					}
+				} else {
+					tmp.sigh &= 0xffffff00;	/* Finish the truncation */
+				}
+			} else
+				precision_loss = 0;
+
+			templ = (tmp.sigh >> 8) & 0x007fffff;
+
+			if (exp > SINGLE_Emax) {
+			      overflow:
+				EXCEPTION(EX_Overflow);
+				if (!(control_word & CW_Overflow))
+					return 0;
+				set_precision_flag_up();
+				if (!(control_word & CW_Precision))
+					return 0;
+
+				/* This is a special case: see sec 16.2.5.1 of the 80486 book. */
+				/* Masked response is overflow to infinity. */
+				templ = 0x7f800000;
+			} else {
+				if (precision_loss) {
+					if (increment)
+						set_precision_flag_up();
+					else
+						set_precision_flag_down();
+				}
+				/* Add the exponent */
+				templ |= ((exp + SINGLE_Ebias) & 0xff) << 23;
+			}
+		}
+	} else if (st0_tag == TAG_Zero) {
+		templ = 0;
+	} else if (st0_tag == TAG_Special) {
+		st0_tag = FPU_Special(st0_ptr);
+		if (st0_tag == TW_Denormal) {
+			reg_copy(st0_ptr, &tmp);
+
+			/* A denormal will always underflow. */
+#ifndef PECULIAR_486
+			/* An 80486 is supposed to be able to generate
+			   a denormal exception here, but... */
+			/* Underflow has priority. */
+			if (control_word & CW_Underflow)
+				denormal_operand();
+#endif /* PECULIAR_486 */
+			goto denormal_arg;
+		} else if (st0_tag == TW_Infinity) {
+			templ = 0x7f800000;
+		} else if (st0_tag == TW_NaN) {
+			/* Is it really a NaN ? */
+			if ((exponent(st0_ptr) == EXP_OVER)
+			    && (st0_ptr->sigh & 0x80000000)) {
+				/* See if we can get a valid NaN from the FPU_REG */
+				templ = st0_ptr->sigh >> 8;
+				if (!(st0_ptr->sigh & 0x40000000)) {
+					/* It is a signalling NaN */
+					EXCEPTION(EX_Invalid);
+					if (!(control_word & CW_Invalid))
+						return 0;
+					templ |= (0x40000000 >> 8);
+				}
+				templ |= 0x7f800000;
+			} else {
+				/* It is an unsupported data type */
+				EXCEPTION(EX_Invalid);
+				if (!(control_word & CW_Invalid))
+					return 0;
+				templ = 0xffc00000;
+			}
+		}
+#ifdef PARANOID
+		else {
+			EXCEPTION(EX_INTERNAL | 0x164);
+			return 0;
+		}
+#endif
+	} else if (st0_tag == TAG_Empty) {
+		/* Empty register (stack underflow) */
+		EXCEPTION(EX_StackUnder);
+		if (control_word & EX_Invalid) {
+			/* The masked response */
+			/* Put out the QNaN indefinite */
+			RE_ENTRANT_CHECK_OFF;
+			FPU_access_ok(VERIFY_WRITE, single, 4);
+			FPU_put_user(0xffc00000,
+				     (unsigned long __user *)single);
+			RE_ENTRANT_CHECK_ON;
+			return 1;
+		} else
+			return 0;
+	}
+#ifdef PARANOID
+	else {
+		EXCEPTION(EX_INTERNAL | 0x163);
+		return 0;
+	}
+#endif
+	if (getsign(st0_ptr))
+		templ |= 0x80000000;
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_WRITE, single, 4);
+	FPU_put_user(templ, (unsigned long __user *)single);
+	RE_ENTRANT_CHECK_ON;
+
+	return 1;
+}
+
+/* Put a long long into user memory */
+int FPU_store_int64(FPU_REG *st0_ptr, u_char st0_tag, long long __user *d)
+{
+	FPU_REG t;
+	long long tll;
+	int precision_loss;
+
+	if (st0_tag == TAG_Empty) {
+		/* Empty register (stack underflow) */
+		EXCEPTION(EX_StackUnder);
+		goto invalid_operand;
+	} else if (st0_tag == TAG_Special) {
+		st0_tag = FPU_Special(st0_ptr);
+		if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) {
+			EXCEPTION(EX_Invalid);
+			goto invalid_operand;
+		}
+	}
+
+	reg_copy(st0_ptr, &t);
+	precision_loss = FPU_round_to_int(&t, st0_tag);
+	((long *)&tll)[0] = t.sigl;
+	((long *)&tll)[1] = t.sigh;
+	if ((precision_loss == 1) ||
+	    ((t.sigh & 0x80000000) &&
+	     !((t.sigh == 0x80000000) && (t.sigl == 0) && signnegative(&t)))) {
+		EXCEPTION(EX_Invalid);
+		/* This is a special case: see sec 16.2.5.1 of the 80486 book */
+	      invalid_operand:
+		if (control_word & EX_Invalid) {
+			/* Produce something like QNaN "indefinite" */
+			tll = 0x8000000000000000LL;
+		} else
+			return 0;
+	} else {
+		if (precision_loss)
+			set_precision_flag(precision_loss);
+		if (signnegative(&t))
+			tll = -tll;
+	}
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_WRITE, d, 8);
+	if (copy_to_user(d, &tll, 8))
+		FPU_abort;
+	RE_ENTRANT_CHECK_ON;
+
+	return 1;
+}
+
+/* Put a long into user memory */
+int FPU_store_int32(FPU_REG *st0_ptr, u_char st0_tag, long __user *d)
+{
+	FPU_REG t;
+	int precision_loss;
+
+	if (st0_tag == TAG_Empty) {
+		/* Empty register (stack underflow) */
+		EXCEPTION(EX_StackUnder);
+		goto invalid_operand;
+	} else if (st0_tag == TAG_Special) {
+		st0_tag = FPU_Special(st0_ptr);
+		if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) {
+			EXCEPTION(EX_Invalid);
+			goto invalid_operand;
+		}
+	}
+
+	reg_copy(st0_ptr, &t);
+	precision_loss = FPU_round_to_int(&t, st0_tag);
+	if (t.sigh ||
+	    ((t.sigl & 0x80000000) &&
+	     !((t.sigl == 0x80000000) && signnegative(&t)))) {
+		EXCEPTION(EX_Invalid);
+		/* This is a special case: see sec 16.2.5.1 of the 80486 book */
+	      invalid_operand:
+		if (control_word & EX_Invalid) {
+			/* Produce something like QNaN "indefinite" */
+			t.sigl = 0x80000000;
+		} else
+			return 0;
+	} else {
+		if (precision_loss)
+			set_precision_flag(precision_loss);
+		if (signnegative(&t))
+			t.sigl = -(long)t.sigl;
+	}
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_WRITE, d, 4);
+	FPU_put_user(t.sigl, (unsigned long __user *)d);
+	RE_ENTRANT_CHECK_ON;
+
+	return 1;
+}
+
+/* Put a short into user memory */
+int FPU_store_int16(FPU_REG *st0_ptr, u_char st0_tag, short __user *d)
+{
+	FPU_REG t;
+	int precision_loss;
+
+	if (st0_tag == TAG_Empty) {
+		/* Empty register (stack underflow) */
+		EXCEPTION(EX_StackUnder);
+		goto invalid_operand;
+	} else if (st0_tag == TAG_Special) {
+		st0_tag = FPU_Special(st0_ptr);
+		if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) {
+			EXCEPTION(EX_Invalid);
+			goto invalid_operand;
+		}
+	}
+
+	reg_copy(st0_ptr, &t);
+	precision_loss = FPU_round_to_int(&t, st0_tag);
+	if (t.sigh ||
+	    ((t.sigl & 0xffff8000) &&
+	     !((t.sigl == 0x8000) && signnegative(&t)))) {
+		EXCEPTION(EX_Invalid);
+		/* This is a special case: see sec 16.2.5.1 of the 80486 book */
+	      invalid_operand:
+		if (control_word & EX_Invalid) {
+			/* Produce something like QNaN "indefinite" */
+			t.sigl = 0x8000;
+		} else
+			return 0;
+	} else {
+		if (precision_loss)
+			set_precision_flag(precision_loss);
+		if (signnegative(&t))
+			t.sigl = -t.sigl;
+	}
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_WRITE, d, 2);
+	FPU_put_user((short)t.sigl, d);
+	RE_ENTRANT_CHECK_ON;
+
+	return 1;
+}
+
+/* Put a packed bcd array into user memory */
+int FPU_store_bcd(FPU_REG *st0_ptr, u_char st0_tag, u_char __user *d)
+{
+	FPU_REG t;
+	unsigned long long ll;
+	u_char b;
+	int i, precision_loss;
+	u_char sign = (getsign(st0_ptr) == SIGN_NEG) ? 0x80 : 0;
+
+	if (st0_tag == TAG_Empty) {
+		/* Empty register (stack underflow) */
+		EXCEPTION(EX_StackUnder);
+		goto invalid_operand;
+	} else if (st0_tag == TAG_Special) {
+		st0_tag = FPU_Special(st0_ptr);
+		if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) {
+			EXCEPTION(EX_Invalid);
+			goto invalid_operand;
+		}
+	}
+
+	reg_copy(st0_ptr, &t);
+	precision_loss = FPU_round_to_int(&t, st0_tag);
+	ll = significand(&t);
+
+	/* Check for overflow, by comparing with 999999999999999999 decimal. */
+	if ((t.sigh > 0x0de0b6b3) ||
+	    ((t.sigh == 0x0de0b6b3) && (t.sigl > 0xa763ffff))) {
+		EXCEPTION(EX_Invalid);
+		/* This is a special case: see sec 16.2.5.1 of the 80486 book */
+	      invalid_operand:
+		if (control_word & CW_Invalid) {
+			/* Produce the QNaN "indefinite" */
+			RE_ENTRANT_CHECK_OFF;
+			FPU_access_ok(VERIFY_WRITE, d, 10);
+			for (i = 0; i < 7; i++)
+				FPU_put_user(0, d + i);	/* These bytes "undefined" */
+			FPU_put_user(0xc0, d + 7);	/* This byte "undefined" */
+			FPU_put_user(0xff, d + 8);
+			FPU_put_user(0xff, d + 9);
+			RE_ENTRANT_CHECK_ON;
+			return 1;
+		} else
+			return 0;
+	} else if (precision_loss) {
+		/* Precision loss doesn't stop the data transfer */
+		set_precision_flag(precision_loss);
+	}
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_WRITE, d, 10);
+	RE_ENTRANT_CHECK_ON;
+	for (i = 0; i < 9; i++) {
+		b = FPU_div_small(&ll, 10);
+		b |= (FPU_div_small(&ll, 10)) << 4;
+		RE_ENTRANT_CHECK_OFF;
+		FPU_put_user(b, d + i);
+		RE_ENTRANT_CHECK_ON;
+	}
+	RE_ENTRANT_CHECK_OFF;
+	FPU_put_user(sign, d + 9);
+	RE_ENTRANT_CHECK_ON;
+
+	return 1;
+}
+
+/*===========================================================================*/
+
+/* r gets mangled such that sig is int, sign: 
+   it is NOT normalized */
+/* The return value (in eax) is zero if the result is exact,
+   if bits are changed due to rounding, truncation, etc, then
+   a non-zero value is returned */
+/* Overflow is signalled by a non-zero return value (in eax).
+   In the case of overflow, the returned significand always has the
+   largest possible value */
+int FPU_round_to_int(FPU_REG *r, u_char tag)
+{
+	u_char very_big;
+	unsigned eax;
+
+	if (tag == TAG_Zero) {
+		/* Make sure that zero is returned */
+		significand(r) = 0;
+		return 0;	/* o.k. */
+	}
+
+	if (exponent(r) > 63) {
+		r->sigl = r->sigh = ~0;	/* The largest representable number */
+		return 1;	/* overflow */
+	}
+
+	eax = FPU_shrxs(&r->sigl, 63 - exponent(r));
+	very_big = !(~(r->sigh) | ~(r->sigl));	/* test for 0xfff...fff */
+#define	half_or_more	(eax & 0x80000000)
+#define	frac_part	(eax)
+#define more_than_half  ((eax & 0x80000001) == 0x80000001)
+	switch (control_word & CW_RC) {
+	case RC_RND:
+		if (more_than_half	/* nearest */
+		    || (half_or_more && (r->sigl & 1))) {	/* odd -> even */
+			if (very_big)
+				return 1;	/* overflow */
+			significand(r)++;
+			return PRECISION_LOST_UP;
+		}
+		break;
+	case RC_DOWN:
+		if (frac_part && getsign(r)) {
+			if (very_big)
+				return 1;	/* overflow */
+			significand(r)++;
+			return PRECISION_LOST_UP;
+		}
+		break;
+	case RC_UP:
+		if (frac_part && !getsign(r)) {
+			if (very_big)
+				return 1;	/* overflow */
+			significand(r)++;
+			return PRECISION_LOST_UP;
+		}
+		break;
+	case RC_CHOP:
+		break;
+	}
+
+	return eax ? PRECISION_LOST_DOWN : 0;
+
+}
+
+/*===========================================================================*/
+
+u_char __user *fldenv(fpu_addr_modes addr_modes, u_char __user *s)
+{
+	unsigned short tag_word = 0;
+	u_char tag;
+	int i;
+
+	if ((addr_modes.default_mode == VM86) ||
+	    ((addr_modes.default_mode == PM16)
+	     ^ (addr_modes.override.operand_size == OP_SIZE_PREFIX))) {
+		RE_ENTRANT_CHECK_OFF;
+		FPU_access_ok(VERIFY_READ, s, 0x0e);
+		FPU_get_user(control_word, (unsigned short __user *)s);
+		FPU_get_user(partial_status, (unsigned short __user *)(s + 2));
+		FPU_get_user(tag_word, (unsigned short __user *)(s + 4));
+		FPU_get_user(instruction_address.offset,
+			     (unsigned short __user *)(s + 6));
+		FPU_get_user(instruction_address.selector,
+			     (unsigned short __user *)(s + 8));
+		FPU_get_user(operand_address.offset,
+			     (unsigned short __user *)(s + 0x0a));
+		FPU_get_user(operand_address.selector,
+			     (unsigned short __user *)(s + 0x0c));
+		RE_ENTRANT_CHECK_ON;
+		s += 0x0e;
+		if (addr_modes.default_mode == VM86) {
+			instruction_address.offset
+			    += (instruction_address.selector & 0xf000) << 4;
+			operand_address.offset +=
+			    (operand_address.selector & 0xf000) << 4;
+		}
+	} else {
+		RE_ENTRANT_CHECK_OFF;
+		FPU_access_ok(VERIFY_READ, s, 0x1c);
+		FPU_get_user(control_word, (unsigned short __user *)s);
+		FPU_get_user(partial_status, (unsigned short __user *)(s + 4));
+		FPU_get_user(tag_word, (unsigned short __user *)(s + 8));
+		FPU_get_user(instruction_address.offset,
+			     (unsigned long __user *)(s + 0x0c));
+		FPU_get_user(instruction_address.selector,
+			     (unsigned short __user *)(s + 0x10));
+		FPU_get_user(instruction_address.opcode,
+			     (unsigned short __user *)(s + 0x12));
+		FPU_get_user(operand_address.offset,
+			     (unsigned long __user *)(s + 0x14));
+		FPU_get_user(operand_address.selector,
+			     (unsigned long __user *)(s + 0x18));
+		RE_ENTRANT_CHECK_ON;
+		s += 0x1c;
+	}
+
+#ifdef PECULIAR_486
+	control_word &= ~0xe080;
+#endif /* PECULIAR_486 */
+
+	top = (partial_status >> SW_Top_Shift) & 7;
+
+	if (partial_status & ~control_word & CW_Exceptions)
+		partial_status |= (SW_Summary | SW_Backward);
+	else
+		partial_status &= ~(SW_Summary | SW_Backward);
+
+	for (i = 0; i < 8; i++) {
+		tag = tag_word & 3;
+		tag_word >>= 2;
+
+		if (tag == TAG_Empty)
+			/* New tag is empty.  Accept it */
+			FPU_settag(i, TAG_Empty);
+		else if (FPU_gettag(i) == TAG_Empty) {
+			/* Old tag is empty and new tag is not empty.  New tag is determined
+			   by old reg contents */
+			if (exponent(&fpu_register(i)) == -EXTENDED_Ebias) {
+				if (!
+				    (fpu_register(i).sigl | fpu_register(i).
+				     sigh))
+					FPU_settag(i, TAG_Zero);
+				else
+					FPU_settag(i, TAG_Special);
+			} else if (exponent(&fpu_register(i)) ==
+				   0x7fff - EXTENDED_Ebias) {
+				FPU_settag(i, TAG_Special);
+			} else if (fpu_register(i).sigh & 0x80000000)
+				FPU_settag(i, TAG_Valid);
+			else
+				FPU_settag(i, TAG_Special);	/* An Un-normal */
+		}
+		/* Else old tag is not empty and new tag is not empty.  Old tag
+		   remains correct */
+	}
+
+	return s;
+}
+
+void frstor(fpu_addr_modes addr_modes, u_char __user *data_address)
+{
+	int i, regnr;
+	u_char __user *s = fldenv(addr_modes, data_address);
+	int offset = (top & 7) * 10, other = 80 - offset;
+
+	/* Copy all registers in stack order. */
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_READ, s, 80);
+	__copy_from_user(register_base + offset, s, other);
+	if (offset)
+		__copy_from_user(register_base, s + other, offset);
+	RE_ENTRANT_CHECK_ON;
+
+	for (i = 0; i < 8; i++) {
+		regnr = (i + top) & 7;
+		if (FPU_gettag(regnr) != TAG_Empty)
+			/* The loaded data over-rides all other cases. */
+			FPU_settag(regnr, FPU_tagof(&st(i)));
+	}
+
+}
+
+u_char __user *fstenv(fpu_addr_modes addr_modes, u_char __user *d)
+{
+	if ((addr_modes.default_mode == VM86) ||
+	    ((addr_modes.default_mode == PM16)
+	     ^ (addr_modes.override.operand_size == OP_SIZE_PREFIX))) {
+		RE_ENTRANT_CHECK_OFF;
+		FPU_access_ok(VERIFY_WRITE, d, 14);
+#ifdef PECULIAR_486
+		FPU_put_user(control_word & ~0xe080, (unsigned long __user *)d);
+#else
+		FPU_put_user(control_word, (unsigned short __user *)d);
+#endif /* PECULIAR_486 */
+		FPU_put_user(status_word(), (unsigned short __user *)(d + 2));
+		FPU_put_user(fpu_tag_word, (unsigned short __user *)(d + 4));
+		FPU_put_user(instruction_address.offset,
+			     (unsigned short __user *)(d + 6));
+		FPU_put_user(operand_address.offset,
+			     (unsigned short __user *)(d + 0x0a));
+		if (addr_modes.default_mode == VM86) {
+			FPU_put_user((instruction_address.
+				      offset & 0xf0000) >> 4,
+				     (unsigned short __user *)(d + 8));
+			FPU_put_user((operand_address.offset & 0xf0000) >> 4,
+				     (unsigned short __user *)(d + 0x0c));
+		} else {
+			FPU_put_user(instruction_address.selector,
+				     (unsigned short __user *)(d + 8));
+			FPU_put_user(operand_address.selector,
+				     (unsigned short __user *)(d + 0x0c));
+		}
+		RE_ENTRANT_CHECK_ON;
+		d += 0x0e;
+	} else {
+		RE_ENTRANT_CHECK_OFF;
+		FPU_access_ok(VERIFY_WRITE, d, 7 * 4);
+#ifdef PECULIAR_486
+		control_word &= ~0xe080;
+		/* An 80486 sets nearly all of the reserved bits to 1. */
+		control_word |= 0xffff0040;
+		partial_status = status_word() | 0xffff0000;
+		fpu_tag_word |= 0xffff0000;
+		I387->soft.fcs &= ~0xf8000000;
+		I387->soft.fos |= 0xffff0000;
+#endif /* PECULIAR_486 */
+		if (__copy_to_user(d, &control_word, 7 * 4))
+			FPU_abort;
+		RE_ENTRANT_CHECK_ON;
+		d += 0x1c;
+	}
+
+	control_word |= CW_Exceptions;
+	partial_status &= ~(SW_Summary | SW_Backward);
+
+	return d;
+}
+
+void fsave(fpu_addr_modes addr_modes, u_char __user *data_address)
+{
+	u_char __user *d;
+	int offset = (top & 7) * 10, other = 80 - offset;
+
+	d = fstenv(addr_modes, data_address);
+
+	RE_ENTRANT_CHECK_OFF;
+	FPU_access_ok(VERIFY_WRITE, d, 80);
+
+	/* Copy all registers in stack order. */
+	if (__copy_to_user(d, register_base + offset, other))
+		FPU_abort;
+	if (offset)
+		if (__copy_to_user(d + other, register_base, offset))
+			FPU_abort;
+	RE_ENTRANT_CHECK_ON;
+
+	finit();
+}
+
+/*===========================================================================*/