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fpp.c
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fpp.c
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/*
* UAE - The Un*x Amiga Emulator
*
* MC68881 emulation
*
* Copyright 1996 Herman ten Brugge
*/
#define __USE_ISOC9X /* We might be able to pick up a NaN */
#include <math.h>
#include "sysconfig.h"
#include "sysdeps.h"
#include "options.h"
#include "memory.h"
#include "custom.h"
#include "events.h"
#include "newcpu.h"
#include "ersatz.h"
#include "md-fpp.h"
#include "savestate.h"
#if 1
#define DEBUG_FPP 0
#define FFLAG_Z 0x4000
#define FFLAG_N 0x0100
#define FFLAG_NAN 0x0400
#define MAKE_FPSR(regs, r) (regs)->fp_result = (r)
typedef enum {
FPP_ROUND_TO_NEAREST = 0,
FPP_ROUND_TO_ZERO,
FPP_ROUND_DOWN,
FPP_ROUND_UP
} fpp_rounding_mode;
typedef enum {
FPP_EXTENDED_PRECISION = 0,
FPP_SINGLE_PRECISION,
FPP_DOUBLE_PRECISION
} fpp_precision;
STATIC_INLINE void native_set_fpucw (uae_u32 m68k_cw)
{
#if USE_X86_FPUCW
fpp_precision m68k_prec = (m68k_cw >> 6) & 3;
fpp_rounding_mode m68k_round = (m68k_cw >> 4) & 3;
unsigned int x86_prec;
unsigned int x86_round;
uae_u16 x;
switch (m68k_prec) {
case FPP_EXTENDED_PRECISION: default: x86_prec = 3; break;
case FPP_SINGLE_PRECISION: x86_prec = 0; break;
case FPP_DOUBLE_PRECISION: x86_prec = 1; break;
}
switch (m68k_round) {
case FPP_ROUND_TO_NEAREST: default: x86_round = 0; break;
case FPP_ROUND_TO_ZERO: x86_round = 3; break;
case FPP_ROUND_DOWN: x86_round = 1; break;
case FPP_ROUND_UP: x86_round = 2; break;
}
x = 0x107f + (x86_prec << 8) + (x86_round << 10);
#ifdef _MSC_VER
__asm {
fldcw x
}
#else
__asm__ ("fldcw %0" : : "m" (*&x));
#endif
#endif /* USE_X86_FPUCW */
}
#if defined(uae_s64) /* Close enough for government work? */
typedef uae_s64 tointtype;
#else
typedef uae_s32 tointtype;
#endif
STATIC_INLINE fpp_rounding_mode get_rounding_mode (const struct regstruct *regs)
{
return (regs->fpsr >> 4) & 3;
}
STATIC_INLINE tointtype toint (fpp_rounding_mode mode, fptype src)
{
switch (mode) {
case FPP_ROUND_TO_NEAREST:
#if USE_X86_FPUCW
return (tointtype) (src);
#else
return (tointtype) (src + 0.5);
#endif
case FPP_ROUND_TO_ZERO:
return (tointtype) src;
case FPP_ROUND_DOWN:
return (tointtype) floor (src);
case FPP_ROUND_UP:
return (tointtype) ceil (src);
}
}
STATIC_INLINE uae_u32 get_fpsr (const struct regstruct *regs)
{
uae_u32 answer = regs->fpsr & 0x00ffffff;
#ifdef HAVE_ISNAN
if (isnan (regs->fp_result))
answer |= 0x01000000;
else
#endif
{
if (regs->fp_result == 0)
answer |= 0x04000000;
else if (regs->fp_result < 0)
answer |= 0x08000000;
#ifdef HAVE_ISINF
if (isinf (regs->fp_result))
answer |= 0x02000000;
#endif
}
return answer;
}
uae_u32 fpp_get_fpsr (const struct regstruct *regs)
{
return get_fpsr (regs);
}
STATIC_INLINE void set_fpsr (struct regstruct *regs, uae_u32 x)
{
regs->fpsr = x;
if (x & 0x01000000) {
#ifdef NAN
regs->fp_result = NAN;
#else
regs->fp_result = pow (1e100, 10) - pow(1e100, 10); /* Any better way? */
#endif
}
else if (x & 0x04000000)
regs->fp_result = 0;
else if (x & 0x08000000)
regs->fp_result = -1;
else
regs->fp_result = 1;
}
/* single : S 8*E 23*F */
/* double : S 11*E 52*F */
/* extended : S 15*E 64*F */
/* E = 0 & F = 0 -> 0 */
/* E = MAX & F = 0 -> Infin */
/* E = MAX & F # 0 -> NotANumber */
/* E = biased by 127 (single) ,1023 (double) ,16383 (extended) */
STATIC_INLINE fptype to_pack (uae_u32 wrd1, uae_u32 wrd2, uae_u32 wrd3)
{
fptype d;
char *cp;
char str[100];
cp = str;
if (wrd1 & 0x80000000)
*cp++ = '-';
*cp++ = (wrd1 & 0xf) + '0';
*cp++ = '.';
*cp++ = ((wrd2 >> 28) & 0xf) + '0';
*cp++ = ((wrd2 >> 24) & 0xf) + '0';
*cp++ = ((wrd2 >> 20) & 0xf) + '0';
*cp++ = ((wrd2 >> 16) & 0xf) + '0';
*cp++ = ((wrd2 >> 12) & 0xf) + '0';
*cp++ = ((wrd2 >> 8) & 0xf) + '0';
*cp++ = ((wrd2 >> 4) & 0xf) + '0';
*cp++ = ((wrd2 >> 0) & 0xf) + '0';
*cp++ = ((wrd3 >> 28) & 0xf) + '0';
*cp++ = ((wrd3 >> 24) & 0xf) + '0';
*cp++ = ((wrd3 >> 20) & 0xf) + '0';
*cp++ = ((wrd3 >> 16) & 0xf) + '0';
*cp++ = ((wrd3 >> 12) & 0xf) + '0';
*cp++ = ((wrd3 >> 8) & 0xf) + '0';
*cp++ = ((wrd3 >> 4) & 0xf) + '0';
*cp++ = ((wrd3 >> 0) & 0xf) + '0';
*cp++ = 'E';
if (wrd1 & 0x40000000)
*cp++ = '-';
*cp++ = ((wrd1 >> 24) & 0xf) + '0';
*cp++ = ((wrd1 >> 20) & 0xf) + '0';
*cp++ = ((wrd1 >> 16) & 0xf) + '0';
*cp = 0;
sscanf (str, "%le", &d);
return d;
}
STATIC_INLINE void from_pack (fptype src, uae_u32 * wrd1, uae_u32 * wrd2, uae_u32 * wrd3)
{
int i;
int t;
char *cp;
char str[100];
sprintf (str, "%.16e", src);
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;
}
}
STATIC_INLINE int get_fp_value (uae_u32 opcode, uae_u16 extra, fptype *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 };
if ((extra & 0x4000) == 0) {
*src = regs.fp[(extra >> 10) & 7];
return 1;
}
mode = (opcode >> 3) & 7;
reg = opcode & 7;
size = (extra >> 10) & 7;
switch (mode) {
case 0:
switch (size) {
case 6:
*src = (fptype) (uae_s8) m68k_dreg (®s, reg);
break;
case 4:
*src = (fptype) (uae_s16) m68k_dreg (®s, reg);
break;
case 0:
*src = (fptype) (uae_s32) m68k_dreg (®s, reg);
break;
case 1:
*src = to_single (m68k_dreg (®s, reg));
break;
default:
return 0;
}
return 1;
case 1:
return 0;
case 2:
ad = m68k_areg (®s, reg);
break;
case 3:
ad = m68k_areg (®s, reg);
m68k_areg (®s, reg) += reg == 7 ? sz2[size] : sz1[size];
break;
case 4:
m68k_areg (®s, reg) -= reg == 7 ? sz2[size] : sz1[size];
ad = m68k_areg (®s, reg);
break;
case 5:
ad = m68k_areg (®s, reg) + (uae_s32) (uae_s16) next_iword (®s);
break;
case 6:
ad = get_disp_ea_020 (®s, m68k_areg (®s, reg), next_iword (®s));
break;
case 7:
switch (reg) {
case 0:
ad = (uae_s32) (uae_s16) next_iword (®s);
break;
case 1:
ad = next_ilong (®s);
break;
case 2:
ad = m68k_getpc (®s);
ad += (uae_s32) (uae_s16) next_iword (®s);
break;
case 3:
tmppc = m68k_getpc (®s);
tmp = next_iword (®s);
ad = get_disp_ea_020 (®s, tmppc, tmp);
break;
case 4:
ad = m68k_getpc (®s);
m68k_setpc (®s, ad + sz2[size]);
if (size == 6)
ad++;
break;
default:
return 0;
}
}
switch (size) {
case 0:
*src = (fptype) (uae_s32) get_long (ad);
break;
case 1:
*src = to_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 = to_exten (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 = to_pack (wrd1, wrd2, wrd3);
}
break;
case 4:
*src = (fptype) (uae_s16) get_word (ad);
break;
case 5:{
uae_u32 wrd1, wrd2;
wrd1 = get_long (ad);
ad += 4;
wrd2 = get_long (ad);
*src = to_double (wrd1, wrd2);
}
break;
case 6:
*src = (fptype) (uae_s8) get_byte (ad);
break;
default:
return 0;
}
return 1;
}
STATIC_INLINE int put_fp_value (struct regstruct *regs, fptype value, uae_u32 opcode, uae_u16 extra)
{
uae_u16 tmp;
uaecptr tmppc;
int size;
int mode;
int reg;
uae_u32 ad;
static const int sz1[8] = { 4, 4, 12, 12, 2, 8, 1, 0 };
static const int sz2[8] = { 4, 4, 12, 12, 2, 8, 2, 0 };
if ((extra & 0x4000) == 0) {
regs->fp[(extra >> 10) & 7] = value;
return 1;
}
mode = (opcode >> 3) & 7;
reg = opcode & 7;
size = (extra >> 10) & 7;
ad = -1;
switch (mode) {
case 0: {
fpp_rounding_mode rounding_mode = get_rounding_mode (regs);
switch (size) {
case 6:
m68k_dreg (regs, reg) = (uae_u32)(((toint (rounding_mode, value) & 0xff)
| (m68k_dreg (regs, reg) & ~0xff)));
break;
case 4:
m68k_dreg (regs, reg) = (uae_u32)(((toint (rounding_mode, value) & 0xffff)
| (m68k_dreg (regs, reg) & ~0xffff)));
break;
case 0:
m68k_dreg (regs, reg) = (uae_u32) toint (rounding_mode, value);
break;
case 1:
m68k_dreg (regs, reg) = from_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 (regs);
break;
case 6:
ad = get_disp_ea_020 (regs, m68k_areg (regs, reg), next_iword (regs));
break;
case 7:
switch (reg) {
case 0:
ad = (uae_s32) (uae_s16) next_iword (regs);
break;
case 1:
ad = next_ilong (regs);
break;
case 2:
ad = m68k_getpc (regs);
ad += (uae_s32) (uae_s16) next_iword (regs);
break;
case 3:
tmppc = m68k_getpc (regs);
tmp = next_iword (regs);
ad = get_disp_ea_020 (regs, tmppc, tmp);
break;
case 4:
ad = m68k_getpc (regs);
m68k_setpc (regs, ad + sz2[size]);
break;
default:
return 0;
}
}
switch (size) {
case 0:
put_long (ad, (uae_u32) toint (get_rounding_mode (regs), value));
break;
case 1:
put_long (ad, from_single (value));
break;
case 2:
{
uae_u32 wrd1, wrd2, wrd3;
from_exten (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;
from_pack (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 (get_rounding_mode (regs), value));
break;
case 5:{
uae_u32 wrd1, wrd2;
from_double (value, &wrd1, &wrd2);
put_long (ad, wrd1);
ad += 4;
put_long (ad, wrd2);
}
break;
case 6:
put_byte (ad, (uae_s8) toint (get_rounding_mode (regs), value));
break;
default:
return 0;
}
return 1;
}
STATIC_INLINE int 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 (®s, reg);
break;
case 3:
*ad = m68k_areg (®s, reg);
break;
case 4:
*ad = m68k_areg (®s, reg);
break;
case 5:
*ad = m68k_areg (®s, reg) + (uae_s32) (uae_s16) next_iword (®s);
break;
case 6:
*ad = get_disp_ea_020 (®s, m68k_areg (®s, reg), next_iword (®s));
break;
case 7:
switch (reg) {
case 0:
*ad = (uae_s32) (uae_s16) next_iword (®s);
break;
case 1:
*ad = next_ilong (®s);
break;
case 2:
*ad = m68k_getpc (®s);
*ad += (uae_s32) (uae_s16) next_iword (®s);
break;
case 3:
tmppc = m68k_getpc (®s);
tmp = next_iword (®s);
*ad = get_disp_ea_020 (®s, tmppc, tmp);
break;
default:
return 0;
}
}
return 1;
}
STATIC_INLINE int fpp_cond (uae_u32 opcode, int contition)
{
int N = (regs.fp_result<0);
int Z = (regs.fp_result==0);
/* int I = (regs.fpsr & 0x2000000) != 0; */
int NotANumber = 0;
#ifdef HAVE_ISNAN
NotANumber = isnan (regs.fp_result);
#endif
if (NotANumber)
N=Z=0;
switch (contition) {
case 0x00:
return 0;
case 0x01:
return Z;
case 0x02:
return !(NotANumber || Z || N);
case 0x03:
return Z || !(NotANumber || N);
case 0x04:
return N && !(NotANumber || Z);
case 0x05:
return Z || (N && !NotANumber);
case 0x06:
return !(NotANumber || Z);
case 0x07:
return !NotANumber;
case 0x08:
return NotANumber;
case 0x09:
return NotANumber || Z;
case 0x0a:
return NotANumber || !(N || Z);
case 0x0b:
return NotANumber || Z || !N;
case 0x0c:
return NotANumber || (N && !Z);
case 0x0d:
return NotANumber || Z || N;
case 0x0e:
return !Z;
case 0x0f:
return 1;
case 0x10:
return 0;
case 0x11:
return Z;
case 0x12:
return !(NotANumber || Z || N);
case 0x13:
return Z || !(NotANumber || N);
case 0x14:
return N && !(NotANumber || Z);
case 0x15:
return Z || (N && !NotANumber);
case 0x16:
return !(NotANumber || Z);
case 0x17:
return !NotANumber;
case 0x18:
return NotANumber;
case 0x19:
return NotANumber || Z;
case 0x1a:
return NotANumber || !(N || Z);
case 0x1b:
return NotANumber || Z || !N;
case 0x1c:
#if 0
return NotANumber || (Z && N); /* This is wrong, compare 0x0c */
#else
return NotANumber || (N && !Z);
#endif
case 0x1d:
return NotANumber || Z || N;
case 0x1e:
return !Z;
case 0x1f:
return 1;
}
return -1;
}
void fdbcc_opp (uae_u32 opcode, struct regstruct *regs, uae_u16 extra)
{
uaecptr pc = (uae_u32) m68k_getpc (regs);
uae_s32 disp = (uae_s32) (uae_s16) next_iword (regs);
int cc;
#if DEBUG_FPP
write_log ("FPU: fdbcc_opp at %08lx\n", m68k_getpc (regs));
flush_log ();
#endif
cc = fpp_cond (opcode, extra & 0x3f);
if (cc == -1) {
m68k_setpc (regs, pc - 4);
op_illg (opcode, regs);
} else if (!cc) {
int reg = opcode & 0x7;
m68k_dreg (regs, reg) = ((m68k_dreg (regs, reg) & ~0xffff)
| ((m68k_dreg (regs, reg) - 1) & 0xffff));
if ((m68k_dreg (regs, reg) & 0xffff) == 0xffff)
m68k_setpc (regs, pc + disp);
}
}
void fscc_opp (uae_u32 opcode, struct regstruct *regs, uae_u16 extra)
{
uae_u32 ad;
int cc;
#if DEBUG_FPP
write_log ("FPU: fscc_opp at %08lx\n", m68k_getpc (regs));
flush_log ();
#endif
cc = fpp_cond (opcode, extra & 0x3f);
if (cc == -1) {
m68k_setpc (regs, m68k_getpc (regs) - 4);
op_illg (opcode, regs);
} 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 (regs, m68k_getpc (regs) - 4);
op_illg (opcode, regs);
} else
put_byte (ad, cc ? 0xff : 0x00);
}
}
void ftrapcc_opp (uae_u32 opcode, struct regstruct *regs, uaecptr oldpc)
{
int cc;
#if DEBUG_FPP
write_log ("FPU: ftrapcc_opp at %08lx\n", m68k_getpc (regs));
flush_log ();
#endif
cc = fpp_cond (opcode, opcode & 0x3f);
if (cc == -1) {
m68k_setpc (regs, oldpc);
op_illg (opcode, regs);
}
if (cc)
Exception (7, regs, oldpc - 2);
}
void fbcc_opp (uae_u32 opcode, struct regstruct *regs, uaecptr pc, uae_u32 extra)
{
int cc;
#if DEBUG_FPP
write_log ("FPU: fbcc_opp at %08lx\n", m68k_getpc (regs));
flush_log ();
#endif
cc = fpp_cond (opcode, opcode & 0x3f);
if (cc == -1) {
m68k_setpc (regs, pc);
op_illg (opcode, regs);
} else if (cc) {
if ((opcode & 0x40) == 0)
extra = (uae_s32) (uae_s16) extra;
m68k_setpc (regs, pc + extra);
}
}
void fsave_opp (uae_u32 opcode, struct regstruct *regs)
{
uae_u32 ad;
int incr = (opcode & 0x38) == 0x20 ? -1 : 1;
int fpu_version = 0x18; /* 68881 */
// int fpu_version = 0x38; /* 68882 */
int i;
#if DEBUG_FPP
write_log ("FPU: fsave_opp at %08lx\n", m68k_getpc (regs));
flush_log ();
#endif
if (get_fp_ad (opcode, &ad) == 0) {
m68k_setpc (regs, m68k_getpc (regs) - 2);
op_illg (opcode, regs);
return;
}
if (currprefs.cpu_level >= 4) {
/* 4 byte 68040 IDLE frame. */
if (incr < 0) {
ad -= 4;
put_long (ad, 0x41000000);
} else {
put_long (ad, 0x41000000);
ad += 4;
}
} else {
if (incr < 0) {
ad -= 4;
put_long (ad, 0x70000000);
for (i = 0; i < 5; i++) {
ad -= 4;
put_long (ad, 0x00000000);
}
ad -= 4;
put_long (ad, 0x1f000000 | (fpu_version << 16));
} else {
put_long (ad, 0x1f000000 | (fpu_version << 16));
ad += 4;
for (i = 0; i < 5; i++) {
put_long (ad, 0x00000000);
ad += 4;
}
put_long (ad, 0x70000000);
ad += 4;
}
}
if ((opcode & 0x38) == 0x18)
m68k_areg (regs, opcode & 7) = ad;
if ((opcode & 0x38) == 0x20)
m68k_areg (regs, opcode & 7) = ad;
}
void frestore_opp (uae_u32 opcode, struct regstruct *regs)
{
uae_u32 ad;
uae_u32 d;
int incr = (opcode & 0x38) == 0x20 ? -1 : 1;
#if DEBUG_FPP
write_log ("FPU: frestore_opp at %08lx\n", m68k_getpc (regs));
flush_log ();
#endif
if (get_fp_ad (opcode, &ad) == 0) {
m68k_setpc (regs, m68k_getpc (regs) - 2);
op_illg (opcode, regs);
return;
}
if (currprefs.cpu_level >= 4) {
/* 68040 */
if (incr < 0) {
/* @@@ This may be wrong. */
ad -= 4;
d = get_long (ad);
if ((d & 0xff000000) != 0) { /* Not a NULL frame? */
if ((d & 0x00ff0000) == 0) { /* IDLE */
} else if ((d & 0x00ff0000) == 0x00300000) { /* UNIMP */
ad -= 44;
} else if ((d & 0x00ff0000) == 0x00600000) { /* BUSY */
ad -= 92;
}
}
} else {
d = get_long (ad);
ad += 4;
if ((d & 0xff000000) != 0) { /* Not a NULL frame? */
if ((d & 0x00ff0000) == 0) { /* IDLE */
} else if ((d & 0x00ff0000) == 0x00300000) { /* UNIMP */
ad += 44;
} else if ((d & 0x00ff0000) == 0x00600000) { /* BUSY */
ad += 92;
}
}
}
} else {
if (incr < 0) {
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);
ad += 4;
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;
}
}
}
if ((opcode & 0x38) == 0x18)
m68k_areg (regs, opcode & 7) = ad;
if ((opcode & 0x38) == 0x20)
m68k_areg (regs, opcode & 7) = ad;
}
static void fround (int reg)
{
regs.fp[reg] = (float)regs.fp[reg];
}
void fpp_opp (uae_u32 opcode, struct regstruct *regs, uae_u16 extra)
{
int reg;
fptype src;
#if DEBUG_FPP
write_log ("FPU: %04lx %04x at %08lx\n", opcode & 0xffff, extra & 0xffff, m68k_getpc (regs) - 4);
flush_log ();
#endif
switch ((extra >> 13) & 0x7) {
case 3:
if (put_fp_value (regs, regs->fp[(extra >> 7) & 7], opcode, extra) == 0) {
m68k_setpc (regs, m68k_getpc (regs) - 4);
op_illg (opcode, regs);
}
return;
case 4:
case 5:
if ((opcode & 0x38) == 0) {
if (extra & 0x2000) {
if (extra & 0x1000)
m68k_dreg (regs, opcode & 7) = regs->fpcr;
if (extra & 0x0800)
m68k_dreg (regs, opcode & 7) = get_fpsr (regs);
if (extra & 0x0400)
m68k_dreg (regs, opcode & 7) = regs->fpiar;
} else {
if (extra & 0x1000) {
regs->fpcr = m68k_dreg (regs, opcode & 7);
native_set_fpucw (regs->fpcr);
}
if (extra & 0x0800)
set_fpsr (regs, m68k_dreg (regs, opcode & 7));
if (extra & 0x0400)
regs->fpiar = m68k_dreg (regs, opcode & 7);
}
} else if ((opcode & 0x38) == 0x08) {
if (extra & 0x2000) {
if (extra & 0x1000)
m68k_areg (regs, opcode & 7) = regs->fpcr;
if (extra & 0x0800)
m68k_areg (regs, opcode & 7) = get_fpsr (regs);
if (extra & 0x0400)
m68k_areg (regs, opcode & 7) = regs->fpiar;
} else {
if (extra & 0x1000) {
regs->fpcr = m68k_areg (regs, opcode & 7);
native_set_fpucw (regs->fpcr);
}
if (extra & 0x0800)
set_fpsr (regs, m68k_areg (regs, opcode & 7));
if (extra & 0x0400)
regs->fpiar = m68k_areg (regs, opcode & 7);
}
} else if ((opcode & 0x3f) == 0x3c) {
if ((extra & 0x2000) == 0) {
if (extra & 0x1000) {
regs->fpcr = next_ilong (regs);
native_set_fpucw (regs->fpcr);
}
if (extra & 0x0800)
set_fpsr (regs, next_ilong (regs));
if (extra & 0x0400)
regs->fpiar = next_ilong (regs);
}
} else if (extra & 0x2000) {
/* FMOVEM FPP->memory */
uae_u32 ad;
int incr = 0;
if (get_fp_ad (opcode, &ad) == 0) {
m68k_setpc (regs, m68k_getpc (regs) - 4);
op_illg (opcode, regs);
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) {
put_long (ad, regs->fpcr);
ad += 4;
}
if (extra & 0x0800) {
put_long (ad, get_fpsr (regs));
ad += 4;
}
if (extra & 0x0400) {
put_long (ad, regs->fpiar);
ad += 4;
}
ad -= incr;
if ((opcode & 0x38) == 0x18)
m68k_areg (regs, opcode & 7) = ad;
if ((opcode & 0x38) == 0x20)
m68k_areg (regs, opcode & 7) = ad;
} else {
/* FMOVEM memory->FPP */
uae_u32 ad;
if (get_fp_ad (opcode, &ad) == 0) {
m68k_setpc (regs, m68k_getpc (regs) - 4);
op_illg (opcode, regs);
return;
}
ad = (opcode & 0x38) == 0x20 ? ad - 12 : ad;
if (extra & 0x1000) {
regs->fpcr = get_long (ad);
native_set_fpucw (regs->fpcr);
ad += 4;
}
if (extra & 0x0800) {
set_fpsr (regs, get_long (ad));
ad += 4;
}
if (extra & 0x0400) {
regs->fpiar = get_long (ad);
ad += 4;
}
if ((opcode & 0x38) == 0x18)
m68k_areg (regs, opcode & 7) = ad;
if ((opcode & 0x38) == 0x20)