Macintosh-Tools
/
macemu
mirror of https://github.com/kanjitalk755/macemu.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
macemu/BasiliskII/src/uae_cpu/fpu/fpu_ieee.cpp

2153 lines
58 KiB
C++
Raw Blame History

/*
* fpu/fpu_ieee.cpp
*
* Basilisk II (C) 1997-2008 Christian Bauer
*
* MC68881/68040 fpu emulation
*
* Original UAE FPU, copyright 1996 Herman ten Brugge
* Rewrite for x86, copyright 1999-2000 Lauri Pesonen
* New framework, copyright 2000 Gwenole Beauchesne
* Adapted for JIT compilation (c) Bernd Meyer, 2000
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Following fixes by Lauri Pesonen, July 1999:
*
* FMOVEM list handling:
* The lookup tables did not work correctly, rewritten.
* FINT:
* (int) cast does not work, fixed.
* Further, now honors the FPU fpcr rounding modes.
* FINTRZ:
* (int) cast cannot be used, fixed.
* FGETEXP:
* Input argument value 0 returned erroneous value.
* FMOD:
* (int) cast cannot be used. Replaced by proper rounding.
* Quotient byte handling was missing.
* FREM:
* (int) cast cannot be used. Replaced by proper rounding.
* Quotient byte handling was missing.
* FSCALE:
* Input argument value 0 was not handled correctly.
* FMOVEM Control Registers to/from address FPU registers An:
* A bug caused the code never been called.
* FMOVEM Control Registers pre-decrement:
* Moving of control regs from memory to FPP was not handled properly,
* if not all of the three FPU registers were moved.
* Condition code "Not Greater Than or Equal":
* Returned erroneous value.
* FSINCOS:
* Cosine must be loaded first if same register.
* FMOVECR:
* Status register was not updated (yes, this affects it).
* FMOVE <ea> -> reg:
* Status register was not updated (yes, this affects it).
* FMOVE reg -> reg:
* Status register was not updated.
* FDBcc:
* The loop termination condition was wrong.
* Possible leak from int16 to int32 fixed.
* get_fp_value:
* Immediate addressing mode && Operation Length == Byte ->
* Use the low-order byte of the extension word.
* Now FPU fpcr high 16 bits are always read as zeroes, no matter what was
* written to them.
*
* Other:
* - Optimized single/double/extended to/from conversion functions.
* Huge speed boost, but not (necessarily) portable to other systems.
* Enabled/disabled by #define FPU_HAVE_IEEE_DOUBLE 1
* - Optimized versions of FSCALE, FGETEXP, FGETMAN
* - Conversion routines now handle NaN and infinity better.
* - Some constants precalculated. Not all compilers can optimize the
* expressions previously used.
*
* TODO:
* - Floating point exceptions.
* - More Infinity/NaN/overflow/underflow checking.
* - FPU instruction_address (only needed when exceptions are implemented)
* - Should be written in assembly to support long doubles.
* - Precision rounding single/double
*/
#include "sysdeps.h"
#include <stdio.h>
#include "memory.h"
#include "readcpu.h"
#include "newcpu.h"
#include "main.h"
#define FPU_IMPLEMENTATION
#include "fpu/fpu.h"
#include "fpu/fpu_ieee.h"
/* Global FPU context */
fpu_t fpu;
/* -------------------------------------------------------------------------- */
/* --- Scopes Definition --- */
/* -------------------------------------------------------------------------- */
#undef PUBLIC
#define PUBLIC /**/
#undef PRIVATE
#define PRIVATE static
#undef FFPU
#define FFPU /**/
#undef FPU
#define FPU fpu.
/* -------------------------------------------------------------------------- */
/* --- Native Support --- */
/* -------------------------------------------------------------------------- */
#include "fpu/mathlib.h"
#include "fpu/flags.h"
#include "fpu/exceptions.h"
#include "fpu/rounding.h"
#include "fpu/impl.h"
#include "fpu/mathlib.cpp"
#include "fpu/flags.cpp"
#include "fpu/exceptions.cpp"
#include "fpu/rounding.cpp"
/* -------------------------------------------------------------------------- */
/* --- Debugging --- */
/* -------------------------------------------------------------------------- */
PUBLIC void FFPU fpu_dump_registers(void)
{
for (int i = 0; i < 8; i++){
printf ("FP%d: %g ", i, fpu_get_register(i));
if ((i & 3) == 3)
printf ("\n");
}
}
PUBLIC void FFPU fpu_dump_flags(void)
{
printf ("N=%d Z=%d I=%d NAN=%d\n",
(get_fpsr() & FPSR_CCB_NEGATIVE) != 0,
(get_fpsr() & FPSR_CCB_ZERO)!= 0,
(get_fpsr() & FPSR_CCB_INFINITY) != 0,
(get_fpsr() & FPSR_CCB_NAN) != 0);
}
PRIVATE void FFPU dump_registers(const char * str)
{
#if FPU_DEBUG && FPU_DUMP_REGISTERS
char temp_str[512];
sprintf(temp_str, "%s: %.04f, %.04f, %.04f, %.04f, %.04f, %.04f, %.04f, %.04f\n",
str,
fpu_get_register(0), fpu_get_register(1), fpu_get_register(2),
fpu_get_register(3), fpu_get_register(4), fpu_get_register(5),
fpu_get_register(6), fpu_get_register(7) );
fpu_debug((temp_str));
#endif
}
PRIVATE void FFPU dump_first_bytes(uae_u8 * buffer, uae_s32 actual)
{
#if FPU_DEBUG && FPU_DUMP_FIRST_BYTES
char temp_buf1[256], temp_buf2[10];
int bytes = sizeof(temp_buf1)/3-1-3;
if (actual < bytes)
bytes = actual;
temp_buf1[0] = 0;
for (int i = 0; i < bytes; i++) {
sprintf(temp_buf2, "%02x ", (uae_u32)buffer[i]);
strcat(temp_buf1, temp_buf2);
}
strcat(temp_buf1, "\n");
fpu_debug((temp_buf1));
#endif
}
// Quotient Byte is loaded with the sign and least significant
// seven bits of the quotient.
PRIVATE inline void FFPU make_quotient(fpu_register const & quotient, uae_u32 sign)
{
uae_u32 lsb = (uae_u32)fp_fabs(quotient) & 0x7f;
FPU fpsr.quotient = sign | (lsb << 16);
}
// to_single
PRIVATE inline fpu_register FFPU make_single(uae_u32 value)
{
#if 1
// Use a single, otherwise some checks for NaN, Inf, Zero would have to
// be performed
fpu_single result = 0; // = 0 to workaround a compiler bug on SPARC
fp_declare_init_shape(srp, result, single);
srp->ieee.negative = (value >> 31) & 1;
srp->ieee.exponent = (value >> 23) & FP_SINGLE_EXP_MAX;
srp->ieee.mantissa = value & 0x007fffff;
fpu_debug(("make_single (%X) = %.04f\n",value,(double)result));
return result;
#elif 0 /* Original code */
if ((value & 0x7fffffff) == 0)
return (0.0);
fpu_register result;
uae_u32 * p = (uae_u32 *)&result;
uae_u32 sign = (value & 0x80000000);
uae_u32 exp = ((value & 0x7F800000) >> 23) + 1023 - 127;
p[FLO] = value << 29;
p[FHI] = sign | (exp << 20) | ((value & 0x007FFFFF) >> 3);
fpu_debug(("make_single (%X) = %.04f\n",value,(double)result));
return(result);
#endif
}
// from_single
PRIVATE inline uae_u32 FFPU extract_single(fpu_register const & src)
{
#if 1
fpu_single input = (fpu_single) src;
fp_declare_init_shape(sip, input, single);
uae_u32 result = (sip->ieee.negative << 31)
| (sip->ieee.exponent << 23)
| sip->ieee.mantissa;
fpu_debug(("extract_single (%.04f) = %X\n",(double)src,result));
return result;
#elif 0 /* Original code */
if (src == 0.0)
return 0;
uae_u32 result;
uae_u32 *p = (uae_u32 *)&src;
uae_u32 sign = (p[FHI] & 0x80000000);
uae_u32 exp = (p[FHI] & 0x7FF00000) >> 20;
if(exp + 127 < 1023) {
exp = 0;
} else if(exp > 1023 + 127) {
exp = 255;
} else {
exp = exp + 127 - 1023;
}
result = sign | (exp << 23) | ((p[FHI] & 0x000FFFFF) << 3) | (p[FLO] >> 29);
fpu_debug(("extract_single (%.04f) = %X\n",(double)src,result));
return (result);
#endif
}
// to_exten
PRIVATE inline fpu_register FFPU make_extended(uae_u32 wrd1, uae_u32 wrd2, uae_u32 wrd3)
{
// is it zero?
if ((wrd1 & 0x7fff0000) == 0 && wrd2 == 0 && wrd3 == 0)
return 0.0;
fpu_register result;
#if USE_QUAD_DOUBLE
// is it NaN?
if ((wrd1 & 0x7fff0000) == 0x7fff0000 && wrd2 != 0 && wrd3 != 0) {
make_nan(result);
return result;
}
// is it inf?
if ((wrd1 & 0x7ffff000) == 0x7fff0000 && wrd2 == 0 && wrd3 == 0) {
if ((wrd1 & 0x80000000) == 0)
make_inf_positive(result);
else
make_inf_negative(result);
return result;
}
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = (wrd1 >> 16) & FP_EXTENDED_EXP_MAX;
srp->ieee.mantissa0 = (wrd2 >> 16) & 0xffff;
srp->ieee.mantissa1 = ((wrd2 & 0xffff) << 16) | ((wrd3 >> 16) & 0xffff);
srp->ieee.mantissa2 = (wrd3 & 0xffff) << 16;
srp->ieee.mantissa3 = 0;
#elif USE_LONG_DOUBLE
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = (wrd1 >> 16) & FP_EXTENDED_EXP_MAX;
srp->ieee.mantissa0 = wrd2;
srp->ieee.mantissa1 = wrd3;
#else
uae_u32 sgn = (wrd1 >> 31) & 1;
uae_u32 exp = (wrd1 >> 16) & 0x7fff;
// the explicit integer bit is not set, must normalize
if ((wrd2 & 0x80000000) == 0) {
fpu_debug(("make_extended denormalized mantissa (%X,%X,%X)\n",wrd1,wrd2,wrd3));
if (wrd2 | wrd3) {
// mantissa, not fraction.
uae_u64 man = ((uae_u64)wrd2 << 32) | wrd3;
while (exp > 0 && (man & UVAL64(0x8000000000000000)) == 0) {
man <<= 1;
exp--;
}
wrd2 = (uae_u32)(man >> 32);
wrd3 = (uae_u32)(man & 0xFFFFFFFF);
}
else if (exp != 0x7fff) // zero
exp = FP_EXTENDED_EXP_BIAS - FP_DOUBLE_EXP_BIAS;
}
if (exp < FP_EXTENDED_EXP_BIAS - FP_DOUBLE_EXP_BIAS)
exp = 0;
else if (exp > FP_EXTENDED_EXP_BIAS + FP_DOUBLE_EXP_BIAS)
exp = FP_DOUBLE_EXP_MAX;
else
exp += FP_DOUBLE_EXP_BIAS - FP_EXTENDED_EXP_BIAS;
fp_declare_init_shape(srp, result, double);
srp->ieee.negative = sgn;
srp->ieee.exponent = exp;
// drop the explicit integer bit
srp->ieee.mantissa0 = (wrd2 & 0x7fffffff) >> 11;
srp->ieee.mantissa1 = (wrd2 << 21) | (wrd3 >> 11);
#endif
fpu_debug(("make_extended (%X,%X,%X) = %.04f\n",wrd1,wrd2,wrd3,(double)result));
return result;
}
/*
Would be so much easier with full size floats :(
... this is so vague.
*/
// make_extended_no_normalize
PRIVATE inline void FFPU make_extended_no_normalize(
uae_u32 wrd1, uae_u32 wrd2, uae_u32 wrd3, fpu_register & result
)
{
// is it zero?
if ((wrd1 && 0x7fff0000) == 0 && wrd2 == 0 && wrd3 == 0) {
make_zero_positive(result);
return;
}
// is it NaN?
if ((wrd1 & 0x7fff0000) == 0x7fff0000 && wrd2 != 0 && wrd3 != 0) {
make_nan(result);
return;
}
#if USE_QUAD_DOUBLE
// is it inf?
if ((wrd1 & 0x7ffff000) == 0x7fff0000 && wrd2 == 0 && wrd3 == 0) {
if ((wrd1 & 0x80000000) == 0)
make_inf_positive(result);
else
make_inf_negative(result);
return;
}
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = (wrd1 >> 16) & FP_EXTENDED_EXP_MAX;
srp->ieee.mantissa0 = (wrd2 >> 16) & 0xffff;
srp->ieee.mantissa1 = ((wrd2 & 0xffff) << 16) | ((wrd3 >> 16) & 0xffff);
srp->ieee.mantissa2 = (wrd3 & 0xffff) << 16;
srp->ieee.mantissa3 = 0;
#elif USE_LONG_DOUBLE
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = (wrd1 >> 16) & FP_EXTENDED_EXP_MAX;
srp->ieee.mantissa0 = wrd2;
srp->ieee.mantissa1 = wrd3;
#else
uae_u32 exp = (wrd1 >> 16) & 0x7fff;
if (exp < FP_EXTENDED_EXP_BIAS - FP_DOUBLE_EXP_BIAS)
exp = 0;
else if (exp > FP_EXTENDED_EXP_BIAS + FP_DOUBLE_EXP_BIAS)
exp = FP_DOUBLE_EXP_MAX;
else
exp += FP_DOUBLE_EXP_BIAS - FP_EXTENDED_EXP_BIAS;
fp_declare_init_shape(srp, result, double);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = exp;
// drop the explicit integer bit
srp->ieee.mantissa0 = (wrd2 & 0x7fffffff) >> 11;
srp->ieee.mantissa1 = (wrd2 << 21) | (wrd3 >> 11);
#endif
fpu_debug(("make_extended (%X,%X,%X) = %.04f\n",wrd1,wrd2,wrd3,(double)result));
}
// from_exten
PRIVATE inline void FFPU extract_extended(fpu_register const & src,
uae_u32 * wrd1, uae_u32 * wrd2, uae_u32 * wrd3
)
{
if (src == 0.0) {
*wrd1 = *wrd2 = *wrd3 = 0;
return;
}
#if USE_QUAD_DOUBLE
// FIXME: deal with denormals?
fp_declare_init_shape(srp, src, extended);
*wrd1 = (srp->ieee.negative << 31) | (srp->ieee.exponent << 16);
// always set the explicit integer bit.
*wrd2 = 0x80000000 | (srp->ieee.mantissa0 << 15) | ((srp->ieee.mantissa1 & 0xfffe0000) >> 17);
*wrd3 = (srp->ieee.mantissa1 << 15) | ((srp->ieee.mantissa2 & 0xfffe0000) >> 17);
#elif USE_LONG_DOUBLE
uae_u32 *p = (uae_u32 *)&src;
#ifdef WORDS_BIGENDIAN
*wrd1 = p[0];
*wrd2 = p[1];
*wrd3 = p[2];
#else
*wrd3 = p[0];
*wrd2 = p[1];
*wrd1 = ( (uae_u32)*((uae_u16 *)&p[2]) ) << 16;
#endif
#else
fp_declare_init_shape(srp, src, double);
fpu_debug(("extract_extended (%d,%d,%X,%X)\n",
srp->ieee.negative , srp->ieee.exponent,
srp->ieee.mantissa0, srp->ieee.mantissa1));
uae_u32 exp = srp->ieee.exponent;
if (exp == FP_DOUBLE_EXP_MAX)
exp = FP_EXTENDED_EXP_MAX;
else
exp += FP_EXTENDED_EXP_BIAS - FP_DOUBLE_EXP_BIAS;
*wrd1 = (srp->ieee.negative << 31) | (exp << 16);
// always set the explicit integer bit.
*wrd2 = 0x80000000 | (srp->ieee.mantissa0 << 11) | ((srp->ieee.mantissa1 & 0xffe00000) >> 21);
*wrd3 = srp->ieee.mantissa1 << 11;
#endif
fpu_debug(("extract_extended (%.04f) = %X,%X,%X\n",(double)src,*wrd1,*wrd2,*wrd3));
}
// to_double
PRIVATE inline fpu_register FFPU make_double(uae_u32 wrd1, uae_u32 wrd2)
{
union {
fpu_double value;
uae_u32 parts[2];
} dest;
#ifdef WORDS_BIGENDIAN
dest.parts[0] = wrd1;
dest.parts[1] = wrd2;
#else
dest.parts[0] = wrd2;
dest.parts[1] = wrd1;
#endif
fpu_debug(("make_double (%X,%X) = %.04f\n",wrd1,wrd2,dest.value));
return (fpu_register)(dest.value);
}
// from_double
PRIVATE inline void FFPU extract_double(fpu_register const & src,
uae_u32 * wrd1, uae_u32 * wrd2
)
{
union {
fpu_double value;
uae_u32 parts[2];
} dest;
dest.value = (fpu_double)src;
#ifdef WORDS_BIGENDIAN
*wrd1 = dest.parts[0];
*wrd2 = dest.parts[1];
#else
*wrd2 = dest.parts[0];
*wrd1 = dest.parts[1];
#endif
fpu_debug(("extract_double (%.04f) = %X,%X\n",(double)src,*wrd1,*wrd2));
}
// to_pack
PRIVATE inline fpu_register FFPU make_packed(uae_u32 wrd1, uae_u32 wrd2, uae_u32 wrd3)
{
fpu_double d;
char *cp;
char str[100];
cp = str;
if (wrd1 & 0x80000000)
*cp++ = '-';
*cp++ = (char)((wrd1 & 0xf) + '0');
*cp++ = '.';
*cp++ = (char)(((wrd2 >> 28) & 0xf) + '0');
*cp++ = (char)(((wrd2 >> 24) & 0xf) + '0');
*cp++ = (char)(((wrd2 >> 20) & 0xf) + '0');
*cp++ = (char)(((wrd2 >> 16) & 0xf) + '0');
*cp++ = (char)(((wrd2 >> 12) & 0xf) + '0');
*cp++ = (char)(((wrd2 >> 8) & 0xf) + '0');
*cp++ = (char)(((wrd2 >> 4) & 0xf) + '0');
*cp++ = (char)(((wrd2 >> 0) & 0xf) + '0');
*cp++ = (char)(((wrd3 >> 28) & 0xf) + '0');
*cp++ = (char)(((wrd3 >> 24) & 0xf) + '0');
*cp++ = (char)(((wrd3 >> 20) & 0xf) + '0');
*cp++ = (char)(((wrd3 >> 16) & 0xf) + '0');
*cp++ = (char)(((wrd3 >> 12) & 0xf) + '0');
*cp++ = (char)(((wrd3 >> 8) & 0xf) + '0');
*cp++ = (char)(((wrd3 >> 4) & 0xf) + '0');
*cp++ = (char)(((wrd3 >> 0) & 0xf) + '0');
*cp++ = 'E';
if (wrd1 & 0x40000000)
*cp++ = '-';
*cp++ = (char)(((wrd1 >> 24) & 0xf) + '0');
*cp++ = (char)(((wrd1 >> 20) & 0xf) + '0');
*cp++ = (char)(((wrd1 >> 16) & 0xf) + '0');
*cp = 0;
sscanf(str, "%le", &d);
fpu_debug(("make_packed str = %s\n",str));
fpu_debug(("make_packed(%X,%X,%X) = %.04f\n",wrd1,wrd2,wrd3,(double)d));
return d;
}
// from_pack
PRIVATE inline void FFPU extract_packed(fpu_register const & src, uae_u32 * wrd1, uae_u32 * wrd2, uae_u32 * wrd3)
{
int i;
int t;
char *cp;
char str[100];
sprintf(str, "%.16e", src);
fpu_debug(("extract_packed(%.04f,%s)\n",(double)src,str));
cp = str;
*wrd1 = *wrd2 = *wrd3 = 0;
if (*cp == '-') {
cp++;
*wrd1 = 0x80000000;
}
if (*cp == '+')
cp++;
*wrd1 |= (*cp++ - '0');
if (*cp == '.')
cp++;
for (i = 0; i < 8; i++) {
*wrd2 <<= 4;
if (*cp >= '0' && *cp <= '9')
*wrd2 |= *cp++ - '0';
}
for (i = 0; i < 8; i++) {
*wrd3 <<= 4;
if (*cp >= '0' && *cp <= '9')
*wrd3 |= *cp++ - '0';
}
if (*cp == 'e' || *cp == 'E') {
cp++;
if (*cp == '-') {
cp++;
*wrd1 |= 0x40000000;
}
if (*cp == '+')
cp++;
t = 0;
for (i = 0; i < 3; i++) {
if (*cp >= '0' && *cp <= '9')
t = (t << 4) | (*cp++ - '0');
}
*wrd1 |= t << 16;
}
fpu_debug(("extract_packed(%.04f) = %X,%X,%X\n",(double)src,*wrd1,*wrd2,*wrd3));
}
PRIVATE inline int FFPU get_fp_value (uae_u32 opcode, uae_u16 extra, fpu_register & src)
{
uaecptr tmppc;
uae_u16 tmp;
int size;
int mode;
int reg;
uae_u32 ad = 0;
static int sz1[8] = {4, 4, 12, 12, 2, 8, 1, 0};
static int sz2[8] = {4, 4, 12, 12, 2, 8, 2, 0};
// fpu_debug(("get_fp_value(%X,%X)\n",(int)opcode,(int)extra));
// dump_first_bytes( regs.pc_p-4, 16 );
if ((extra & 0x4000) == 0) {
src = FPU registers[(extra >> 10) & 7];
return 1;
}
mode = (opcode >> 3) & 7;
reg = opcode & 7;
size = (extra >> 10) & 7;
fpu_debug(("get_fp_value mode=%d, reg=%d, size=%d\n",(int)mode,(int)reg,(int)size));
switch (mode) {
case 0:
switch (size) {
case 6:
src = (fpu_register) (uae_s8) m68k_dreg (regs, reg);
break;
case 4:
src = (fpu_register) (uae_s16) m68k_dreg (regs, reg);
break;
case 0:
src = (fpu_register) (uae_s32) m68k_dreg (regs, reg);
break;
case 1:
src = make_single(m68k_dreg (regs, reg));
break;
default:
return 0;
}
return 1;
case 1:
return 0;
case 2:
ad = m68k_areg (regs, reg);
break;
case 3:
ad = m68k_areg (regs, reg);
m68k_areg (regs, reg) += reg == 7 ? sz2[size] : sz1[size];
break;
case 4:
m68k_areg (regs, reg) -= reg == 7 ? sz2[size] : sz1[size];
ad = m68k_areg (regs, reg);
break;
case 5:
ad = m68k_areg (regs, reg) + (uae_s32) (uae_s16) next_iword();
break;
case 6:
ad = get_disp_ea_020 (m68k_areg (regs, reg), next_iword());
break;
case 7:
switch (reg) {
case 0:
ad = (uae_s32) (uae_s16) next_iword();
break;
case 1:
ad = next_ilong();
break;
case 2:
ad = m68k_getpc ();
ad += (uae_s32) (uae_s16) next_iword();
fpu_debug(("get_fp_value next_iword()=%X\n",ad-m68k_getpc()-2));
break;
case 3:
tmppc = m68k_getpc ();
tmp = (uae_u16)next_iword();
ad = get_disp_ea_020 (tmppc, tmp);
break;
case 4:
ad = m68k_getpc ();
m68k_setpc (ad + sz2[size]);
// Immediate addressing mode && Operation Length == Byte ->
// Use the low-order byte of the extension word.
if(size == 6) ad++;
break;
default:
return 0;
}
}
fpu_debug(("get_fp_value m68k_getpc()=%X\n",m68k_getpc()));
fpu_debug(("get_fp_value ad=%X\n",ad));
fpu_debug(("get_fp_value get_long (ad)=%X\n",get_long (ad)));
dump_first_bytes( get_real_address(ad)-64, 64 );
dump_first_bytes( get_real_address(ad), 64 );
switch (size) {
case 0:
src = (fpu_register) (uae_s32) get_long (ad);
break;
case 1:
src = make_single(get_long (ad));
break;
case 2: {
uae_u32 wrd1, wrd2, wrd3;
wrd1 = get_long (ad);
ad += 4;
wrd2 = get_long (ad);
ad += 4;
wrd3 = get_long (ad);
src = make_extended(wrd1, wrd2, wrd3);
break;
}
case 3: {
uae_u32 wrd1, wrd2, wrd3;
wrd1 = get_long (ad);
ad += 4;
wrd2 = get_long (ad);
ad += 4;
wrd3 = get_long (ad);
src = make_packed(wrd1, wrd2, wrd3);
break;
}
case 4:
src = (fpu_register) (uae_s16) get_word(ad);
break;
case 5: {
uae_u32 wrd1, wrd2;
wrd1 = get_long (ad);
ad += 4;
wrd2 = get_long (ad);
src = make_double(wrd1, wrd2);
break;
}
case 6:
src = (fpu_register) (uae_s8) get_byte(ad);
break;
default:
return 0;
}
// fpu_debug(("get_fp_value result = %.04f\n",(float)src));
return 1;
}
/* Convert the FP value to integer according to the current m68k rounding mode */
PRIVATE inline uae_s32 FFPU toint(fpu_register const & src)
{
fpu_register result;
switch (get_fpcr() & 0x30) {
case FPCR_ROUND_ZERO:
result = fp_round_to_zero(src);
break;
case FPCR_ROUND_MINF:
result = fp_round_to_minus_infinity(src);
break;
case FPCR_ROUND_NEAR:
result = fp_round_to_nearest(src);
break;
case FPCR_ROUND_PINF:
result = fp_round_to_plus_infinity(src);
break;
default:
result = src; /* should never be reached */
break;
}
return (uae_s32)result;
}
PRIVATE inline int FFPU put_fp_value (uae_u32 opcode, uae_u16 extra, fpu_register const & value)
{
uae_u16 tmp;
uaecptr tmppc;
int size;
int mode;
int reg;
uae_u32 ad;
static int sz1[8] = {4, 4, 12, 12, 2, 8, 1, 0};
static int sz2[8] = {4, 4, 12, 12, 2, 8, 2, 0};
// fpu_debug(("put_fp_value(%.04f,%X,%X)\n",(float)value,(int)opcode,(int)extra));
if ((extra & 0x4000) == 0) {
int dest_reg = (extra >> 10) & 7;
FPU registers[dest_reg] = value;
make_fpsr(FPU registers[dest_reg]);
return 1;
}
mode = (opcode >> 3) & 7;
reg = opcode & 7;
size = (extra >> 10) & 7;
ad = 0xffffffff;
switch (mode) {
case 0:
switch (size) {
case 6:
m68k_dreg (regs, reg) = ((toint(value) & 0xff)
| (m68k_dreg (regs, reg) & ~0xff));
break;
case 4:
m68k_dreg (regs, reg) = ((toint(value) & 0xffff)
| (m68k_dreg (regs, reg) & ~0xffff));
break;
case 0:
m68k_dreg (regs, reg) = toint(value);
break;
case 1:
m68k_dreg (regs, reg) = extract_single(value);
break;
default:
return 0;
}
return 1;
case 1:
return 0;
case 2:
ad = m68k_areg (regs, reg);
break;
case 3:
ad = m68k_areg (regs, reg);
m68k_areg (regs, reg) += reg == 7 ? sz2[size] : sz1[size];
break;
case 4:
m68k_areg (regs, reg) -= reg == 7 ? sz2[size] : sz1[size];
ad = m68k_areg (regs, reg);
break;
case 5:
ad = m68k_areg (regs, reg) + (uae_s32) (uae_s16) next_iword();
break;
case 6:
ad = get_disp_ea_020 (m68k_areg (regs, reg), next_iword());
break;
case 7:
switch (reg) {
case 0:
ad = (uae_s32) (uae_s16) next_iword();
break;
case 1:
ad = next_ilong();
break;
case 2:
ad = m68k_getpc ();
ad += (uae_s32) (uae_s16) next_iword();
break;
case 3:
tmppc = m68k_getpc ();
tmp = (uae_u16)next_iword();
ad = get_disp_ea_020 (tmppc, tmp);
break;
case 4:
ad = m68k_getpc ();
m68k_setpc (ad + sz2[size]);
break;
default:
return 0;
}
}
switch (size) {
case 0:
put_long (ad, toint(value));
break;
case 1:
put_long (ad, extract_single(value));
break;
case 2: {
uae_u32 wrd1, wrd2, wrd3;
extract_extended(value, &wrd1, &wrd2, &wrd3);
put_long (ad, wrd1);
ad += 4;
put_long (ad, wrd2);
ad += 4;
put_long (ad, wrd3);
break;
}
case 3: {
uae_u32 wrd1, wrd2, wrd3;
extract_packed(value, &wrd1, &wrd2, &wrd3);
put_long (ad, wrd1);
ad += 4;
put_long (ad, wrd2);
ad += 4;
put_long (ad, wrd3);
break;
}
case 4:
put_word(ad, (uae_s16) toint(value));
break;
case 5: {
uae_u32 wrd1, wrd2;
extract_double(value, &wrd1, &wrd2);
put_long (ad, wrd1);
ad += 4;
put_long (ad, wrd2);
break;
}
case 6:
put_byte(ad, (uae_s8) toint(value));
break;
default:
return 0;
}
return 1;
}
PRIVATE inline int FFPU get_fp_ad(uae_u32 opcode, uae_u32 * ad)
{
uae_u16 tmp;
uaecptr tmppc;
int mode;
int reg;
mode = (opcode >> 3) & 7;
reg = opcode & 7;
switch (mode) {
case 0:
case 1:
return 0;
case 2:
*ad = m68k_areg (regs, reg);
break;
case 3:
*ad = m68k_areg (regs, reg);
break;
case 4:
*ad = m68k_areg (regs, reg);
break;
case 5:
*ad = m68k_areg (regs, reg) + (uae_s32) (uae_s16) next_iword();
break;
case 6:
*ad = get_disp_ea_020 (m68k_areg (regs, reg), next_iword());
break;
case 7:
switch (reg) {
case 0:
*ad = (uae_s32) (uae_s16) next_iword();
break;
case 1:
*ad = next_ilong();
break;
case 2:
*ad = m68k_getpc ();
*ad += (uae_s32) (uae_s16) next_iword();
break;
case 3:
tmppc = m68k_getpc ();
tmp = (uae_u16)next_iword();
*ad = get_disp_ea_020 (tmppc, tmp);
break;
default:
return 0;
}
}
return 1;
}
#if FPU_DEBUG
# define CONDRET(s,x) fpu_debug(("fpp_cond %s = %d\n",s,(uint32)(x))); return (x)
#else
# define CONDRET(s,x) return (x)
#endif
PRIVATE inline int FFPU fpp_cond(int condition)
{
int N = (FPU result < 0.0);
int Z = (FPU result == 0.0);
int NaN = isnan(FPU result);
if (NaN)
N = Z = 0;
switch (condition) {
case 0x00: CONDRET("False",0);
case 0x01: CONDRET("Equal",Z);
case 0x02: CONDRET("Ordered Greater Than",!(NaN || Z || N));
case 0x03: CONDRET("Ordered Greater Than or Equal",Z || !(NaN || N));
case 0x04: CONDRET("Ordered Less Than",N && !(NaN || Z));
case 0x05: CONDRET("Ordered Less Than or Equal",Z || (N && !NaN));
case 0x06: CONDRET("Ordered Greater or Less Than",!(NaN || Z));
case 0x07: CONDRET("Ordered",!NaN);
case 0x08: CONDRET("Unordered",NaN);
case 0x09: CONDRET("Unordered or Equal",NaN || Z);
case 0x0a: CONDRET("Unordered or Greater Than",NaN || !(N || Z));
case 0x0b: CONDRET("Unordered or Greater or Equal",NaN || Z || !N);
case 0x0c: CONDRET("Unordered or Less Than",NaN || (N && !Z));
case 0x0d: CONDRET("Unordered or Less or Equal",NaN || Z || N);
case 0x0e: CONDRET("Not Equal",!Z);
case 0x0f: CONDRET("True",1);
case 0x10: CONDRET("Signaling False",0);
case 0x11: CONDRET("Signaling Equal",Z);
case 0x12: CONDRET("Greater Than",!(NaN || Z || N));
case 0x13: CONDRET("Greater Than or Equal",Z || !(NaN || N));
case 0x14: CONDRET("Less Than",N && !(NaN || Z));
case 0x15: CONDRET("Less Than or Equal",Z || (N && !NaN));
case 0x16: CONDRET("Greater or Less Than",!(NaN || Z));
case 0x17: CONDRET("Greater, Less or Equal",!NaN);
case 0x18: CONDRET("Not Greater, Less or Equal",NaN);
case 0x19: CONDRET("Not Greater or Less Than",NaN || Z);
case 0x1a: CONDRET("Not Less Than or Equal",NaN || !(N || Z));
case 0x1b: CONDRET("Not Less Than",NaN || Z || !N);
case 0x1c: CONDRET("Not Greater Than or Equal", NaN || (N && !Z));
case 0x1d: CONDRET("Not Greater Than",NaN || Z || N);
case 0x1e: CONDRET("Signaling Not Equal",!Z);
case 0x1f: CONDRET("Signaling True",1);
default: CONDRET("",-1);
}
}
void FFPU fpuop_dbcc(uae_u32 opcode, uae_u32 extra)
{
fpu_debug(("fdbcc_opp %X, %X at %08lx\n", (uae_u32)opcode, (uae_u32)extra, m68k_getpc ()));
uaecptr pc = (uae_u32) m68k_getpc ();
uae_s32 disp = (uae_s32) (uae_s16) next_iword();
int cc = fpp_cond(extra & 0x3f);
if (cc == -1) {
m68k_setpc (pc - 4);
op_illg (opcode);
} else if (!cc) {
int reg = opcode & 0x7;
// this may have leaked.
/*
m68k_dreg (regs, reg) = ((m68k_dreg (regs, reg) & ~0xffff)
| ((m68k_dreg (regs, reg) - 1) & 0xffff));
*/
m68k_dreg (regs, reg) = ((m68k_dreg (regs, reg) & 0xffff0000)
| (((m68k_dreg (regs, reg) & 0xffff) - 1) & 0xffff));
// condition reversed.
// if ((m68k_dreg (regs, reg) & 0xffff) == 0xffff)
if ((m68k_dreg (regs, reg) & 0xffff) != 0xffff)
m68k_setpc (pc + disp);
}
}
void FFPU fpuop_scc(uae_u32 opcode, uae_u32 extra)
{
fpu_debug(("fscc_opp %X, %X at %08lx\n", (uae_u32)opcode, (uae_u32)extra, m68k_getpc ()));
uae_u32 ad;
int cc = fpp_cond(extra & 0x3f);
if (cc == -1) {
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
}
else if ((opcode & 0x38) == 0) {
m68k_dreg (regs, opcode & 7) = (m68k_dreg (regs, opcode & 7) & ~0xff) |
(cc ? 0xff : 0x00);
}
else if (get_fp_ad(opcode, &ad) == 0) {
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
}
else
put_byte(ad, cc ? 0xff : 0x00);
}
void FFPU fpuop_trapcc(uae_u32 opcode, uaecptr oldpc)
{
fpu_debug(("ftrapcc_opp %X at %08lx\n", (uae_u32)opcode, m68k_getpc ()));
int cc = fpp_cond(opcode & 0x3f);
if (cc == -1) {
m68k_setpc (oldpc);
op_illg (opcode);
}
if (cc)
Exception(7, oldpc - 2);
}
// NOTE that we get here also when there is a FNOP (nontrapping false, displ 0)
void FFPU fpuop_bcc(uae_u32 opcode, uaecptr pc, uae_u32 extra)
{
fpu_debug(("fbcc_opp %X, %X at %08lx, jumpto=%X\n", (uae_u32)opcode, (uae_u32)extra, m68k_getpc (), extra ));
int cc = fpp_cond(opcode & 0x3f);
if (cc == -1) {
m68k_setpc (pc);
op_illg (opcode);
}
else if (cc) {
if ((opcode & 0x40) == 0)
extra = (uae_s32) (uae_s16) extra;
m68k_setpc (pc + extra);
}
}
// FSAVE has no post-increment
// 0x1f180000 == IDLE state frame, coprocessor version number 1F
void FFPU fpuop_save(uae_u32 opcode)
{
fpu_debug(("fsave_opp at %08lx\n", m68k_getpc ()));
uae_u32 ad;
int incr = (opcode & 0x38) == 0x20 ? -1 : 1;
int i;
if (get_fp_ad(opcode, &ad) == 0) {
m68k_setpc (m68k_getpc () - 2);
op_illg (opcode);
return;
}
if (CPUType == 4) {
// Put 4 byte 68040 IDLE frame.
if (incr < 0) {
ad -= 4;
put_long (ad, 0x41000000);
}
else {
put_long (ad, 0x41000000);
ad += 4;
}
} else {
// Put 28 byte 68881 IDLE frame.
if (incr < 0) {
fpu_debug(("fsave_opp pre-decrement\n"));
ad -= 4;
// What's this? Some BIU flags, or (incorrectly placed) command/condition?
put_long (ad, 0x70000000);
for (i = 0; i < 5; i++) {
ad -= 4;
put_long (ad, 0x00000000);
}
ad -= 4;
put_long (ad, 0x1f180000); // IDLE, vers 1f
}
else {
put_long (ad, 0x1f180000); // IDLE, vers 1f
ad += 4;
for (i = 0; i < 5; i++) {
put_long (ad, 0x00000000);
ad += 4;
}
// What's this? Some BIU flags, or (incorrectly placed) command/condition?
put_long (ad, 0x70000000);
ad += 4;
}
}
if ((opcode & 0x38) == 0x18) {
m68k_areg (regs, opcode & 7) = ad; // Never executed on a 68881
fpu_debug(("PROBLEM: fsave_opp post-increment\n"));
}
if ((opcode & 0x38) == 0x20) {
m68k_areg (regs, opcode & 7) = ad;
fpu_debug(("fsave_opp pre-decrement %X -> A%d\n",ad,opcode & 7));
}
}
// FRESTORE has no pre-decrement
void FFPU fpuop_restore(uae_u32 opcode)
{
fpu_debug(("frestore_opp at %08lx\n", m68k_getpc ()));
uae_u32 ad;
uae_u32 d;
int incr = (opcode & 0x38) == 0x20 ? -1 : 1;
if (get_fp_ad(opcode, &ad) == 0) {
m68k_setpc (m68k_getpc () - 2);
op_illg (opcode);
return;
}
if (CPUType == 4) {
// 68040
if (incr < 0) {
fpu_debug(("PROBLEM: frestore_opp incr < 0\n"));
// this may be wrong, but it's never called.
ad -= 4;
d = get_long (ad);
if ((d & 0xff000000) != 0) { // Not a NULL frame?
if ((d & 0x00ff0000) == 0) { // IDLE
fpu_debug(("frestore_opp found IDLE frame at %X\n",ad-4));
}
else if ((d & 0x00ff0000) == 0x00300000) { // UNIMP
fpu_debug(("PROBLEM: frestore_opp found UNIMP frame at %X\n",ad-4));
ad -= 44;
}
else if ((d & 0x00ff0000) == 0x00600000) { // BUSY
fpu_debug(("PROBLEM: frestore_opp found BUSY frame at %X\n",ad-4));
ad -= 92;
}
}
}
else {
d = get_long (ad);
fpu_debug(("frestore_opp frame at %X = %X\n",ad,d));
ad += 4;
if ((d & 0xff000000) != 0) { // Not a NULL frame?
if ((d & 0x00ff0000) == 0) { // IDLE
fpu_debug(("frestore_opp found IDLE frame at %X\n",ad-4));
}
else if ((d & 0x00ff0000) == 0x00300000) { // UNIMP
fpu_debug(("PROBLEM: frestore_opp found UNIMP frame at %X\n",ad-4));
ad += 44;
}
else if ((d & 0x00ff0000) == 0x00600000) { // BUSY
fpu_debug(("PROBLEM: frestore_opp found BUSY frame at %X\n",ad-4));
ad += 92;
}
}
}
}
else {
// 68881
if (incr < 0) {
fpu_debug(("PROBLEM: frestore_opp incr < 0\n"));
// this may be wrong, but it's never called.
ad -= 4;
d = get_long (ad);
if ((d & 0xff000000) != 0) {
if ((d & 0x00ff0000) == 0x00180000)
ad -= 6 * 4;
else if ((d & 0x00ff0000) == 0x00380000)
ad -= 14 * 4;
else if ((d & 0x00ff0000) == 0x00b40000)
ad -= 45 * 4;
}
}
else {
d = get_long (ad);
fpu_debug(("frestore_opp frame at %X = %X\n",ad,d));
ad += 4;
if ((d & 0xff000000) != 0) { // Not a NULL frame?
if ((d & 0x00ff0000) == 0x00180000) { // IDLE
fpu_debug(("frestore_opp found IDLE frame at %X\n",ad-4));
ad += 6 * 4;
}
else if ((d & 0x00ff0000) == 0x00380000) {// UNIMP? shouldn't it be 3C?
ad += 14 * 4;
fpu_debug(("PROBLEM: frestore_opp found UNIMP? frame at %X\n",ad-4));
}
else if ((d & 0x00ff0000) == 0x00b40000) {// BUSY
fpu_debug(("PROBLEM: frestore_opp found BUSY frame at %X\n",ad-4));
ad += 45 * 4;
}
}
}
}
if ((opcode & 0x38) == 0x18) {
m68k_areg (regs, opcode & 7) = ad;
fpu_debug(("frestore_opp post-increment %X -> A%d\n",ad,opcode & 7));
}
if ((opcode & 0x38) == 0x20) {
m68k_areg (regs, opcode & 7) = ad; // Never executed on a 68881
fpu_debug(("PROBLEM: frestore_opp pre-decrement\n"));
}
}
void FFPU fpuop_arithmetic(uae_u32 opcode, uae_u32 extra)
{
int reg;
fpu_register src;
fpu_debug(("FPP %04lx %04x at %08lx\n", opcode & 0xffff, extra & 0xffff,
m68k_getpc () - 4));
dump_registers( "START");
switch ((extra >> 13) & 0x7) {
case 3:
fpu_debug(("FMOVE -> <ea>\n"));
if (put_fp_value (opcode, extra, FPU registers[(extra >> 7) & 7]) == 0) {
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
}
dump_registers( "END ");
return;
case 4:
case 5:
if ((opcode & 0x38) == 0) {
if (extra & 0x2000) { // dr bit
if (extra & 0x1000) {
// according to the manual, the msb bits are always zero.
m68k_dreg (regs, opcode & 7) = get_fpcr() & 0xFFFF;
fpu_debug(("FMOVEM FPU fpcr (%X) -> D%d\n", get_fpcr(), opcode & 7));
}
if (extra & 0x0800) {
m68k_dreg (regs, opcode & 7) = get_fpsr();
fpu_debug(("FMOVEM FPU fpsr (%X) -> D%d\n", get_fpsr(), opcode & 7));
}
if (extra & 0x0400) {
m68k_dreg (regs, opcode & 7) = FPU instruction_address;
fpu_debug(("FMOVEM FPU instruction_address (%X) -> D%d\n", FPU instruction_address, opcode & 7));
}
}
else {
if (extra & 0x1000) {
set_fpcr( m68k_dreg (regs, opcode & 7) );
fpu_debug(("FMOVEM D%d (%X) -> FPU fpcr\n", opcode & 7, get_fpcr()));
}
if (extra & 0x0800) {
set_fpsr( m68k_dreg (regs, opcode & 7) );
fpu_debug(("FMOVEM D%d (%X) -> FPU fpsr\n", opcode & 7, get_fpsr()));
}
if (extra & 0x0400) {
FPU instruction_address = m68k_dreg (regs, opcode & 7);
fpu_debug(("FMOVEM D%d (%X) -> FPU instruction_address\n", opcode & 7, FPU instruction_address));
}
}
// } else if ((opcode & 0x38) == 1) {
}
else if ((opcode & 0x38) == 8) {
if (extra & 0x2000) { // dr bit
if (extra & 0x1000) {
// according to the manual, the msb bits are always zero.
m68k_areg (regs, opcode & 7) = get_fpcr() & 0xFFFF;
fpu_debug(("FMOVEM FPU fpcr (%X) -> A%d\n", get_fpcr(), opcode & 7));
}
if (extra & 0x0800) {
m68k_areg (regs, opcode & 7) = get_fpsr();
fpu_debug(("FMOVEM FPU fpsr (%X) -> A%d\n", get_fpsr(), opcode & 7));
}
if (extra & 0x0400) {
m68k_areg (regs, opcode & 7) = FPU instruction_address;
fpu_debug(("FMOVEM FPU instruction_address (%X) -> A%d\n", FPU instruction_address, opcode & 7));
}
} else {
if (extra & 0x1000) {
set_fpcr( m68k_areg (regs, opcode & 7) );
fpu_debug(("FMOVEM A%d (%X) -> FPU fpcr\n", opcode & 7, get_fpcr()));
}
if (extra & 0x0800) {
set_fpsr( m68k_areg (regs, opcode & 7) );
fpu_debug(("FMOVEM A%d (%X) -> FPU fpsr\n", opcode & 7, get_fpsr()));
}
if (extra & 0x0400) {
FPU instruction_address = m68k_areg (regs, opcode & 7);
fpu_debug(("FMOVEM A%d (%X) -> FPU instruction_address\n", opcode & 7, FPU instruction_address));
}
}
}
else if ((opcode & 0x3f) == 0x3c) {
if ((extra & 0x2000) == 0) {
if (extra & 0x1000) {
set_fpcr( next_ilong() );
fpu_debug(("FMOVEM #<%X> -> FPU fpcr\n", get_fpcr()));
}
if (extra & 0x0800) {
set_fpsr( next_ilong() );
fpu_debug(("FMOVEM #<%X> -> FPU fpsr\n", get_fpsr()));
}
if (extra & 0x0400) {
FPU instruction_address = next_ilong();
fpu_debug(("FMOVEM #<%X> -> FPU instruction_address\n", FPU instruction_address));
}
}
}
else if (extra & 0x2000) {
/* FMOVEM FPP->memory */
uae_u32 ad;
int incr = 0;
if (get_fp_ad(opcode, &ad) == 0) {
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
dump_registers( "END ");
return;
}
if ((opcode & 0x38) == 0x20) {
if (extra & 0x1000)
incr += 4;
if (extra & 0x0800)
incr += 4;
if (extra & 0x0400)
incr += 4;
}
ad -= incr;
if (extra & 0x1000) {
// according to the manual, the msb bits are always zero.
put_long (ad, get_fpcr() & 0xFFFF);
fpu_debug(("FMOVEM FPU fpcr (%X) -> mem %X\n", get_fpcr(), ad ));
ad += 4;
}
if (extra & 0x0800) {
put_long (ad, get_fpsr());
fpu_debug(("FMOVEM FPU fpsr (%X) -> mem %X\n", get_fpsr(), ad ));
ad += 4;
}
if (extra & 0x0400) {
put_long (ad, FPU instruction_address);
fpu_debug(("FMOVEM FPU instruction_address (%X) -> mem %X\n", FPU instruction_address, ad ));
ad += 4;
}
ad -= incr;
if ((opcode & 0x38) == 0x18) // post-increment?
m68k_areg (regs, opcode & 7) = ad;
if ((opcode & 0x38) == 0x20) // pre-decrement?
m68k_areg (regs, opcode & 7) = ad;
}
else {
/* FMOVEM memory->FPP */
uae_u32 ad;
if (get_fp_ad(opcode, &ad) == 0) {
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
dump_registers( "END ");
return;
}
// ad = (opcode & 0x38) == 0x20 ? ad - 12 : ad;
int incr = 0;
if((opcode & 0x38) == 0x20) {
if (extra & 0x1000)
incr += 4;
if (extra & 0x0800)
incr += 4;
if (extra & 0x0400)
incr += 4;
ad = ad - incr;
}
if (extra & 0x1000) {
set_fpcr( get_long (ad) );
fpu_debug(("FMOVEM mem %X (%X) -> FPU fpcr\n", ad, get_fpcr() ));
ad += 4;
}
if (extra & 0x0800) {
set_fpsr( get_long (ad) );
fpu_debug(("FMOVEM mem %X (%X) -> FPU fpsr\n", ad, get_fpsr() ));
ad += 4;
}
if (extra & 0x0400) {
FPU instruction_address = get_long (ad);
fpu_debug(("FMOVEM mem %X (%X) -> FPU instruction_address\n", ad, FPU instruction_address ));
ad += 4;
}
if ((opcode & 0x38) == 0x18) // post-increment?
m68k_areg (regs, opcode & 7) = ad;
if ((opcode & 0x38) == 0x20) // pre-decrement?
// m68k_areg (regs, opcode & 7) = ad - 12;
m68k_areg (regs, opcode & 7) = ad - incr;
}
dump_registers( "END ");
return;
case 6:
case 7: {
uae_u32 ad, list = 0;
int incr = 0;
if (extra & 0x2000) {
/* FMOVEM FPP->memory */
fpu_debug(("FMOVEM FPP->memory\n"));
if (get_fp_ad(opcode, &ad) == 0) {
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
dump_registers( "END ");
return;
}
switch ((extra >> 11) & 3) {
case 0: /* static pred */
list = extra & 0xff;
incr = -1;
break;
case 1: /* dynamic pred */
list = m68k_dreg (regs, (extra >> 4) & 3) & 0xff;
incr = -1;
break;
case 2: /* static postinc */
list = extra & 0xff;
incr = 1;
break;
case 3: /* dynamic postinc */
list = m68k_dreg (regs, (extra >> 4) & 3) & 0xff;
incr = 1;
break;
}
if (incr < 0) {
for(reg=7; reg>=0; reg--) {
uae_u32 wrd1, wrd2, wrd3;
if( list & 0x80 ) {
extract_extended(FPU registers[reg],&wrd1, &wrd2, &wrd3);
ad -= 4;
put_long (ad, wrd3);
ad -= 4;
put_long (ad, wrd2);
ad -= 4;
put_long (ad, wrd1);
}
list <<= 1;
}
}
else {
for(reg=0; reg<8; reg++) {
uae_u32 wrd1, wrd2, wrd3;
if( list & 0x80 ) {
extract_extended(FPU registers[reg],&wrd1, &wrd2, &wrd3);
put_long (ad, wrd1);
ad += 4;
put_long (ad, wrd2);
ad += 4;
put_long (ad, wrd3);
ad += 4;
}
list <<= 1;
}
}
if ((opcode & 0x38) == 0x18) // post-increment?
m68k_areg (regs, opcode & 7) = ad;
if ((opcode & 0x38) == 0x20) // pre-decrement?
m68k_areg (regs, opcode & 7) = ad;
}
else {
/* FMOVEM memory->FPP */
fpu_debug(("FMOVEM memory->FPP\n"));
if (get_fp_ad(opcode, &ad) == 0) {
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
dump_registers( "END ");
return;
}
switch ((extra >> 11) & 3) {
case 0: /* static pred */
fpu_debug(("memory->FMOVEM FPP not legal mode.\n"));
list = extra & 0xff;
incr = -1;
break;
case 1: /* dynamic pred */
fpu_debug(("memory->FMOVEM FPP not legal mode.\n"));
list = m68k_dreg (regs, (extra >> 4) & 3) & 0xff;
incr = -1;
break;
case 2: /* static postinc */
list = extra & 0xff;
incr = 1;
break;
case 3: /* dynamic postinc */
list = m68k_dreg (regs, (extra >> 4) & 3) & 0xff;
incr = 1;
break;
}
/**/
if (incr < 0) {
// not reached
for(reg=7; reg>=0; reg--) {
uae_u32 wrd1, wrd2, wrd3;
if( list & 0x80 ) {
ad -= 4;
wrd3 = get_long (ad);
ad -= 4;
wrd2 = get_long (ad);
ad -= 4;
wrd1 = get_long (ad);
// FPU registers[reg] = make_extended(wrd1, wrd2, wrd3);
make_extended_no_normalize (wrd1, wrd2, wrd3, FPU registers[reg]);
}
list <<= 1;
}
}
else {
for(reg=0; reg<8; reg++) {
uae_u32 wrd1, wrd2, wrd3;
if( list & 0x80 ) {
wrd1 = get_long (ad);
ad += 4;
wrd2 = get_long (ad);
ad += 4;
wrd3 = get_long (ad);
ad += 4;
// FPU registers[reg] = make_extended(wrd1, wrd2, wrd3);
make_extended_no_normalize (wrd1, wrd2, wrd3, FPU registers[reg]);
}
list <<= 1;
}
}
if ((opcode & 0x38) == 0x18) // post-increment?
m68k_areg (regs, opcode & 7) = ad;
if ((opcode & 0x38) == 0x20) // pre-decrement?
m68k_areg (regs, opcode & 7) = ad;
}
dump_registers( "END ");
return;
}
case 0:
case 2:
reg = (extra >> 7) & 7;
if ((extra & 0xfc00) == 0x5c00) {
fpu_debug(("FMOVECR memory->FPP\n"));
switch (extra & 0x7f) {
case 0x00:
// FPU registers[reg] = 4.0 * atan(1.0);
FPU registers[reg] = 3.1415926535897932384626433832795;
fpu_debug(("FP const: Pi\n"));
break;
case 0x0b:
// FPU registers[reg] = log10 (2.0);
FPU registers[reg] = 0.30102999566398119521373889472449;
fpu_debug(("FP const: Log 10 (2)\n"));
break;
case 0x0c:
// FPU registers[reg] = exp (1.0);
FPU registers[reg] = 2.7182818284590452353602874713527;
fpu_debug(("FP const: e\n"));
break;
case 0x0d:
// FPU registers[reg] = log (exp (1.0)) / log (2.0);
FPU registers[reg] = 1.4426950408889634073599246810019;
fpu_debug(("FP const: Log 2 (e)\n"));
break;
case 0x0e:
// FPU registers[reg] = log (exp (1.0)) / log (10.0);
FPU registers[reg] = 0.43429448190325182765112891891661;
fpu_debug(("FP const: Log 10 (e)\n"));
break;
case 0x0f:
FPU registers[reg] = 0.0;
fpu_debug(("FP const: zero\n"));
break;
case 0x30:
// FPU registers[reg] = log (2.0);
FPU registers[reg] = 0.69314718055994530941723212145818;
fpu_debug(("FP const: ln(2)\n"));
break;
case 0x31:
// FPU registers[reg] = log (10.0);
FPU registers[reg] = 2.3025850929940456840179914546844;
fpu_debug(("FP const: ln(10)\n"));
break;
case 0x32:
// ??
FPU registers[reg] = 1.0e0;
fpu_debug(("FP const: 1.0e0\n"));
break;
case 0x33:
FPU registers[reg] = 1.0e1;
fpu_debug(("FP const: 1.0e1\n"));
break;
case 0x34:
FPU registers[reg] = 1.0e2;
fpu_debug(("FP const: 1.0e2\n"));
break;
case 0x35:
FPU registers[reg] = 1.0e4;
fpu_debug(("FP const: 1.0e4\n"));
break;
case 0x36:
FPU registers[reg] = 1.0e8;
fpu_debug(("FP const: 1.0e8\n"));
break;
case 0x37:
FPU registers[reg] = 1.0e16;
fpu_debug(("FP const: 1.0e16\n"));
break;
case 0x38:
FPU registers[reg] = 1.0e32;
fpu_debug(("FP const: 1.0e32\n"));
break;
case 0x39:
FPU registers[reg] = 1.0e64;
fpu_debug(("FP const: 1.0e64\n"));
break;
case 0x3a:
FPU registers[reg] = 1.0e128;
fpu_debug(("FP const: 1.0e128\n"));
break;
case 0x3b:
FPU registers[reg] = 1.0e256;
fpu_debug(("FP const: 1.0e256\n"));
break;
#if USE_LONG_DOUBLE || USE_QUAD_DOUBLE
case 0x3c:
FPU registers[reg] = 1.0e512L;
fpu_debug(("FP const: 1.0e512\n"));
break;
case 0x3d:
FPU registers[reg] = 1.0e1024L;
fpu_debug(("FP const: 1.0e1024\n"));
break;
case 0x3e:
FPU registers[reg] = 1.0e2048L;
fpu_debug(("FP const: 1.0e2048\n"));
break;
case 0x3f:
FPU registers[reg] = 1.0e4096L;
fpu_debug(("FP const: 1.0e4096\n"));
#endif
break;
default:
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
break;
}
// these *do* affect the status reg
make_fpsr(FPU registers[reg]);
dump_registers( "END ");
return;
}
if (get_fp_value (opcode, extra, src) == 0) {
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
dump_registers( "END ");
return;
}
fpu_debug(("returned from get_fp_value m68k_getpc()=%X\n",m68k_getpc()));
if (FPU is_integral) {
// 68040-specific operations
switch (extra & 0x7f) {
case 0x40: /* FSMOVE */
fpu_debug(("FSMOVE %.04f\n",(double)src));
FPU registers[reg] = (float)src;
make_fpsr(FPU registers[reg]);
break;
case 0x44: /* FDMOVE */
fpu_debug(("FDMOVE %.04f\n",(double)src));
FPU registers[reg] = (double)src;
make_fpsr(FPU registers[reg]);
break;
case 0x41: /* FSSQRT */
fpu_debug(("FSQRT %.04f\n",(double)src));
FPU registers[reg] = (float)fp_sqrt (src);
make_fpsr(FPU registers[reg]);
break;
case 0x45: /* FDSQRT */
fpu_debug(("FSQRT %.04f\n",(double)src));
FPU registers[reg] = (double)fp_sqrt (src);
make_fpsr(FPU registers[reg]);
break;
case 0x58: /* FSABS */
fpu_debug(("FSABS %.04f\n",(double)src));
FPU registers[reg] = (float)fp_fabs(src);
make_fpsr(FPU registers[reg]);
break;
case 0x5c: /* FDABS */
fpu_debug(("FDABS %.04f\n",(double)src));
FPU registers[reg] = (double)fp_fabs(src);
make_fpsr(FPU registers[reg]);
break;
case 0x5a: /* FSNEG */
fpu_debug(("FSNEG %.04f\n",(double)src));
FPU registers[reg] = (float)-src;
make_fpsr(FPU registers[reg]);
break;
case 0x5e: /* FDNEG */
fpu_debug(("FDNEG %.04f\n",(double)src));
FPU registers[reg] = (double)-src;
make_fpsr(FPU registers[reg]);
break;
case 0x60: /* FSDIV */
fpu_debug(("FSDIV %.04f\n",(double)src));
FPU registers[reg] = (float)(FPU registers[reg] / src);
make_fpsr(FPU registers[reg]);
break;
case 0x64: /* FDDIV */
fpu_debug(("FDDIV %.04f\n",(double)src));
FPU registers[reg] = (double)(FPU registers[reg] / src);
make_fpsr(FPU registers[reg]);
break;
case 0x62: /* FSADD */
fpu_debug(("FSADD %.04f\n",(double)src));
FPU registers[reg] = (float)(FPU registers[reg] + src);
make_fpsr(FPU registers[reg]);
break;
case 0x66: /* FDADD */
fpu_debug(("FDADD %.04f\n",(double)src));
FPU registers[reg] = (double)(FPU registers[reg] + src);
make_fpsr(FPU registers[reg]);
break;
case 0x68: /* FSSUB */
fpu_debug(("FSSUB %.04f\n",(double)src));
FPU registers[reg] = (float)(FPU registers[reg] - src);
make_fpsr(FPU registers[reg]);
break;
case 0x6c: /* FDSUB */
fpu_debug(("FDSUB %.04f\n",(double)src));
FPU registers[reg] = (double)(FPU registers[reg] - src);
make_fpsr(FPU registers[reg]);
break;
case 0x63: /* FSMUL */
case 0x67: /* FDMUL */
fpu_debug(("FMUL %.04f\n",(double)src));
get_dest_flags(FPU registers[reg]);
get_source_flags(src);
if(fl_dest.in_range && fl_source.in_range) {
if ((extra & 0x7f) == 0x63)
FPU registers[reg] = (float)(FPU registers[reg] * src);
else
FPU registers[reg] = (double)(FPU registers[reg] * src);
}
else if (fl_dest.nan || fl_source.nan ||
(fl_dest.zero && fl_source.infinity) ||
(fl_dest.infinity && fl_source.zero)) {
make_nan( FPU registers[reg] );
}
else if (fl_dest.zero || fl_source.zero ) {
if ((fl_dest.negative && !fl_source.negative) ||
(!fl_dest.negative && fl_source.negative)) {
make_zero_negative(FPU registers[reg]);
}
else {
make_zero_positive(FPU registers[reg]);
}
}
else {
if ((fl_dest.negative && !fl_source.negative) ||
(!fl_dest.negative && fl_source.negative)) {
make_inf_negative(FPU registers[reg]);
}
else {
make_inf_positive(FPU registers[reg]);
}
}
make_fpsr(FPU registers[reg]);
break;
default:
// Continue decode-execute 6888x instructions below
goto process_6888x_instructions;
}
fpu_debug(("END m68k_getpc()=%X\n",m68k_getpc()));
dump_registers( "END ");
return;
}
process_6888x_instructions:
switch (extra & 0x7f) {
case 0x00: /* FMOVE */
fpu_debug(("FMOVE %.04f\n",(double)src));
FPU registers[reg] = src;
make_fpsr(FPU registers[reg]);
break;
case 0x01: /* FINT */
fpu_debug(("FINT %.04f\n",(double)src));
FPU registers[reg] = toint(src);
make_fpsr(FPU registers[reg]);
break;
case 0x02: /* FSINH */
fpu_debug(("FSINH %.04f\n",(double)src));
FPU registers[reg] = fp_sinh (src);
make_fpsr(FPU registers[reg]);
break;
case 0x03: /* FINTRZ */
fpu_debug(("FINTRZ %.04f\n",(double)src));
FPU registers[reg] = fp_round_to_zero(src);
make_fpsr(FPU registers[reg]);
break;
case 0x04: /* FSQRT */
fpu_debug(("FSQRT %.04f\n",(double)src));
FPU registers[reg] = fp_sqrt (src);
make_fpsr(FPU registers[reg]);
break;
case 0x06: /* FLOGNP1 */
fpu_debug(("FLOGNP1 %.04f\n",(double)src));
FPU registers[reg] = fp_log (src + 1.0);
make_fpsr(FPU registers[reg]);
break;
case 0x08: /* FETOXM1 */
fpu_debug(("FETOXM1 %.04f\n",(double)src));
FPU registers[reg] = fp_exp (src) - 1.0;
make_fpsr(FPU registers[reg]);
break;
case 0x09: /* FTANH */
fpu_debug(("FTANH %.04f\n",(double)src));
FPU registers[reg] = fp_tanh (src);
make_fpsr(FPU registers[reg]);
break;
case 0x0a: /* FATAN */
fpu_debug(("FATAN %.04f\n",(double)src));
FPU registers[reg] = fp_atan (src);
make_fpsr(FPU registers[reg]);
break;
case 0x0c: /* FASIN */
fpu_debug(("FASIN %.04f\n",(double)src));
FPU registers[reg] = fp_asin (src);
make_fpsr(FPU registers[reg]);
break;
case 0x0d: /* FATANH */
fpu_debug(("FATANH %.04f\n",(double)src));
FPU registers[reg] = fp_atanh (src);
make_fpsr(FPU registers[reg]);
break;
case 0x0e: /* FSIN */
fpu_debug(("FSIN %.04f\n",(double)src));
FPU registers[reg] = fp_sin (src);
make_fpsr(FPU registers[reg]);
break;
case 0x0f: /* FTAN */
fpu_debug(("FTAN %.04f\n",(double)src));
FPU registers[reg] = fp_tan (src);
make_fpsr(FPU registers[reg]);
break;
case 0x10: /* FETOX */
fpu_debug(("FETOX %.04f\n",(double)src));
FPU registers[reg] = fp_exp (src);
make_fpsr(FPU registers[reg]);
break;
case 0x11: /* FTWOTOX */
fpu_debug(("FTWOTOX %.04f\n",(double)src));
FPU registers[reg] = fp_pow(2.0, src);
make_fpsr(FPU registers[reg]);
break;
case 0x12: /* FTENTOX */
fpu_debug(("FTENTOX %.04f\n",(double)src));
FPU registers[reg] = fp_pow(10.0, src);
make_fpsr(FPU registers[reg]);
break;
case 0x14: /* FLOGN */
fpu_debug(("FLOGN %.04f\n",(double)src));
FPU registers[reg] = fp_log (src);
make_fpsr(FPU registers[reg]);
break;
case 0x15: /* FLOG10 */
fpu_debug(("FLOG10 %.04f\n",(double)src));
FPU registers[reg] = fp_log10 (src);
make_fpsr(FPU registers[reg]);
break;
case 0x16: /* FLOG2 */
fpu_debug(("FLOG2 %.04f\n",(double)src));
FPU registers[reg] = fp_log (src) / fp_log (2.0);
make_fpsr(FPU registers[reg]);
break;
case 0x18: /* FABS */
fpu_debug(("FABS %.04f\n",(double)src));
FPU registers[reg] = fp_fabs(src);
make_fpsr(FPU registers[reg]);
break;
case 0x19: /* FCOSH */
fpu_debug(("FCOSH %.04f\n",(double)src));
FPU registers[reg] = fp_cosh(src);
make_fpsr(FPU registers[reg]);
break;
case 0x1a: /* FNEG */
fpu_debug(("FNEG %.04f\n",(double)src));
FPU registers[reg] = -src;
make_fpsr(FPU registers[reg]);
break;
case 0x1c: /* FACOS */
fpu_debug(("FACOS %.04f\n",(double)src));
FPU registers[reg] = fp_acos(src);
make_fpsr(FPU registers[reg]);
break;
case 0x1d: /* FCOS */
fpu_debug(("FCOS %.04f\n",(double)src));
FPU registers[reg] = fp_cos(src);
make_fpsr(FPU registers[reg]);
break;
case 0x1e: /* FGETEXP */
fpu_debug(("FGETEXP %.04f\n",(double)src));
if( isinf(src) ) {
make_nan( FPU registers[reg] );
}
else {
FPU registers[reg] = fast_fgetexp( src );
}
make_fpsr(FPU registers[reg]);
break;
case 0x1f: /* FGETMAN */
fpu_debug(("FGETMAN %.04f\n",(double)src));
if( src == 0 ) {
FPU registers[reg] = 0;
}
else if( isinf(src) ) {
make_nan( FPU registers[reg] );
}
else {
FPU registers[reg] = src;
fast_remove_exponent( FPU registers[reg] );
}
make_fpsr(FPU registers[reg]);
break;
case 0x20: /* FDIV */
fpu_debug(("FDIV %.04f\n",(double)src));
FPU registers[reg] /= src;
make_fpsr(FPU registers[reg]);
break;
case 0x21: /* FMOD */
fpu_debug(("FMOD %.04f\n",(double)src));
// FPU registers[reg] = FPU registers[reg] - (fpu_register) ((int) (FPU registers[reg] / src)) * src;
{
fpu_register quot = fp_round_to_zero(FPU registers[reg] / src);
uae_u32 sign = get_quotient_sign(FPU registers[reg],src);
FPU registers[reg] = FPU registers[reg] - quot * src;
make_fpsr(FPU registers[reg]);
make_quotient(quot, sign);
}
break;
case 0x23: /* FMUL */
fpu_debug(("FMUL %.04f\n",(double)src));
get_dest_flags(FPU registers[reg]);
get_source_flags(src);
if(fl_dest.in_range && fl_source.in_range) {
FPU registers[reg] *= src;
}
else if (fl_dest.nan || fl_source.nan ||
(fl_dest.zero && fl_source.infinity) ||
(fl_dest.infinity && fl_source.zero)) {
make_nan( FPU registers[reg] );
}
else if (fl_dest.zero || fl_source.zero ) {
if ((fl_dest.negative && !fl_source.negative) ||
(!fl_dest.negative && fl_source.negative)) {
make_zero_negative(FPU registers[reg]);
}
else {
make_zero_positive(FPU registers[reg]);
}
}
else {
if ((fl_dest.negative && !fl_source.negative) ||
(!fl_dest.negative && fl_source.negative)) {
make_inf_negative(FPU registers[reg]);
}
else {
make_inf_positive(FPU registers[reg]);
}
}
make_fpsr(FPU registers[reg]);
break;
case 0x24: /* FSGLDIV */
fpu_debug(("FSGLDIV %.04f\n",(double)src));
FPU registers[reg] = (float)(FPU registers[reg] / src);
make_fpsr(FPU registers[reg]);
break;
case 0x25: /* FREM */
fpu_debug(("FREM %.04f\n",(double)src));
// FPU registers[reg] = FPU registers[reg] - (double) ((int) (FPU registers[reg] / src + 0.5)) * src;
{
fpu_register quot = fp_round_to_nearest(FPU registers[reg] / src);
uae_u32 sign = get_quotient_sign(FPU registers[reg],src);
FPU registers[reg] = FPU registers[reg] - quot * src;
make_fpsr(FPU registers[reg]);
make_quotient(quot,sign);
}
break;
case 0x26: /* FSCALE */
fpu_debug(("FSCALE %.04f\n",(double)src));
// TODO: overflow flags
get_dest_flags(FPU registers[reg]);
get_source_flags(src);
if (fl_source.in_range && fl_dest.in_range) {
// When the absolute value of the source operand is >= 2^14,
// an overflow or underflow always results.
// Here (int) cast is okay.
int scale_factor = (int)fp_round_to_zero(src);
#if USE_LONG_DOUBLE || USE_QUAD_DOUBLE
fp_declare_init_shape(sxp, FPU registers[reg], extended);
sxp->ieee.exponent += scale_factor;
#else
fp_declare_init_shape(sxp, FPU registers[reg], double);
uae_u32 exp = sxp->ieee.exponent + scale_factor;
if (exp < FP_EXTENDED_EXP_BIAS - FP_DOUBLE_EXP_BIAS)
exp = 0;
else if (exp > FP_EXTENDED_EXP_BIAS + FP_DOUBLE_EXP_BIAS)
exp = FP_DOUBLE_EXP_MAX;
else
exp += FP_DOUBLE_EXP_BIAS - FP_EXTENDED_EXP_BIAS;
sxp->ieee.exponent = exp;
#endif
}
else if (fl_source.infinity) {
// Returns NaN for any Infinity source
make_nan( FPU registers[reg] );
}
make_fpsr(FPU registers[reg]);
break;
case 0x27: /* FSGLMUL */
fpu_debug(("FSGLMUL %.04f\n",(double)src));
FPU registers[reg] = (float)(FPU registers[reg] * src);
make_fpsr(FPU registers[reg]);
break;
case 0x28: /* FSUB */
fpu_debug(("FSUB %.04f\n",(double)src));
FPU registers[reg] -= src;
make_fpsr(FPU registers[reg]);
break;
case 0x22: /* FADD */
fpu_debug(("FADD %.04f\n",(double)src));
FPU registers[reg] += src;
make_fpsr(FPU registers[reg]);
break;
case 0x30: /* FSINCOS */
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
fpu_debug(("FSINCOS %.04f\n",(double)src));
// Cosine must be calculated first if same register
FPU registers[extra & 7] = fp_cos(src);
FPU registers[reg] = fp_sin (src);
// Set FPU fpsr according to the sine result
make_fpsr(FPU registers[reg]);
break;
case 0x38: /* FCMP */
fpu_debug(("FCMP %.04f\n",(double)src));
set_fpsr(0);
make_fpsr(FPU registers[reg] - src);
break;
case 0x3a: /* FTST */
fpu_debug(("FTST %.04f\n",(double)src));
set_fpsr(0);
make_fpsr(src);
break;
default:
fpu_debug(("ILLEGAL F OP %X\n",opcode));
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
break;
}
fpu_debug(("END m68k_getpc()=%X\n",m68k_getpc()));
dump_registers( "END ");
return;
}
fpu_debug(("ILLEGAL F OP 2 %X\n",opcode));
m68k_setpc (m68k_getpc () - 4);
op_illg (opcode);
dump_registers( "END ");
}
/* -------------------------- Initialization -------------------------- */
PRIVATE uae_u8 m_fpu_state_original[108]; // 90/94/108
PUBLIC void FFPU fpu_init (bool integral_68040)
{
fpu_debug(("fpu_init\n"));
static bool initialized_lookup_tables = false;
if (!initialized_lookup_tables) {
fpu_init_native_fflags();
fpu_init_native_exceptions();
fpu_init_native_accrued_exceptions();
initialized_lookup_tables = true;
}
FPU is_integral = integral_68040;
FPU instruction_address = 0;
FPU fpsr.quotient = 0;
set_fpcr(0);
set_fpsr(0);
#if defined(FPU_USE_X86_ROUNDING)
// Initial state after boot, reset and frestore(null frame)
x86_control_word = CW_INITIAL;
#elif defined(USE_X87_ASSEMBLY)
volatile unsigned short int cw;
__asm__ __volatile__("fnstcw %0" : "=m" (cw));
cw &= ~0x0300; cw |= 0x0300; // CW_PC_EXTENDED
cw &= ~0x0C00; cw |= 0x0000; // CW_RC_NEAR
__asm__ __volatile__("fldcw %0" : : "m" (cw));
#endif
FPU result = 1;
for (int i = 0; i < 8; i++)
make_nan(FPU registers[i]);
}
PUBLIC void FFPU fpu_exit (void)
{
fpu_debug(("fpu_exit\n"));
}
PUBLIC void FFPU fpu_reset (void)
{
fpu_debug(("fpu_reset\n"));
fpu_exit();
fpu_init(FPU is_integral);
}
Reference in New Issue View Git Blame Copy Permalink