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-rw-r--r--arch/i386/math-emu/reg_ld_str.c1370
1 files changed, 1370 insertions, 0 deletions
diff --git a/arch/i386/math-emu/reg_ld_str.c b/arch/i386/math-emu/reg_ld_str.c
new file mode 100644
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+++ b/arch/i386/math-emu/reg_ld_str.c
@@ -0,0 +1,1370 @@
+/*---------------------------------------------------------------------------+
+ | 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 <asm/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);
+ copy_from_user(&s,_s,8);
+ 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;
+
+ 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[0] = 0x00000000; /* Set to */
+ l[1] = 0x7ff00000; /* + 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 */
+ l[0] = 0;
+ l[1] = 0;
+ }
+ 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[0] = 0;
+ 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[0] = 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);
+ copy_to_user(d, &tll, 8);
+ 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 */
+ __copy_to_user(d, &control_word, 7*4);
+ 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. */
+ __copy_to_user(d, register_base+offset, other);
+ if ( offset )
+ __copy_to_user(d+other, register_base, offset);
+ RE_ENTRANT_CHECK_ON;
+
+ finit();
+}
+
+/*===========================================================================*/
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-30 19:41:36 +0000