1 /*
2 * basic, incomplete SSP160x (SSP1601?) interpreter
3 * with SVP memory controller emu
4 *
5 * Copyright (c) Gražvydas "notaz" Ignotas, 2008
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * * Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * * Neither the name of the organization nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 //#define USE_DEBUGGER
31 /* detect ops with unimplemented/invalid fields.
32 * Useful for homebrew or if a new VR revision pops up. */
33 //#define DO_CHECKS
34
35 /*
36 * Register info
37 *
38 * 0. "-"
39 * size: 16
40 * desc: Constant register with all bits set (0xffff).
41 *
42 * 1. "X"
43 * size: 16
44 * desc: Generic register. When set, updates P (P = X * Y * 2)
45 *
46 * 2. "Y"
47 * size: 16
48 * desc: Generic register. When set, updates P (P = X * Y * 2)
49 *
50 * 3. "A"
51 * size: 32
52 * desc: Accumulator.
53 *
54 * 4. "ST"
55 * size: 16
56 * desc: Status register. From MAME: bits 0-9 are CONTROL, other FLAG
57 * fedc ba98 7654 3210
58 * 210 - RPL (?) "Loop size". If non-zero, makes (rX+) and (rX-) respectively
59 * modulo-increment and modulo-decrement. The value shows which
60 * power of 2 to use, i.e. 4 means modulo by 16.
61 * (e: fir16_32.sc, IIR_4B.SC, DECIM.SC)
62 * 43 - RB (?)
63 * 5 - GP0_0 (ST5?) Changed before acessing PM0 (affects banking?).
64 * 6 - GP0_1 (ST6?) Cleared before acessing PM0 (affects banking?). Set after.
65 * datasheet says these (5,6) bits correspond to hardware pins.
66 * 7 - IE (?) Not directly used by SVP code (never set, but preserved)?
67 * 8 - OP (?) Not used by SVP code (only cleared)? (MAME: saturated value
68 * (probably means clamping? i.e. 0x7ffc + 9 -> 0x7fff))
69 * 9 - MACS (?) Not used by SVP code (only cleared)? (e: "mac shift")
70 * a - GPI_0 Interrupt 0 enable/status?
71 * b - GPI_1 Interrupt 1 enable/status?
72 * c - L L flag. Carry?
73 * d - Z Zero flag.
74 * e - OV Overflow flag.
75 * f - N Negative flag.
76 * seen directly changing code sequences:
77 * ldi ST, 0 ld A, ST ld A, ST ld A, ST ldi st, 20h
78 * ldi ST, 60h ori A, 60h and A, E8h and A, E8h
79 * ld ST, A ld ST, A ori 3
80 * ld ST, A
81 *
82 * 5. "STACK"
83 * size: 16
84 * desc: hw stack of 6 levels (according to datasheet)
85 *
86 * 6. "PC"
87 * size: 16
88 * desc: Program counter.
89 *
90 * 7. "P"
91 * size: 32
92 * desc: multiply result register. P = X * Y * 2
93 * probably affected by MACS bit in ST.
94 *
95 * 8. "PM0" (PM from PMAR name from Tasco's docs)
96 * size: 16?
97 * desc: Programmable Memory access register.
98 * On reset, or when one (both?) GP0 bits are clear,
99 * acts as status for XST, mapped at 015004 at 68k side:
100 * bit0: ssp has written something to XST (cleared when 015004 is read)
101 * bit1: 68k has written something through a1500{0|2} (cleared on PM0 read)
102 *
103 * 9. "PM1"
104 * size: 16?
105 * desc: Programmable Memory access register.
106 * This reg. is only used as PMAR.
107 *
108 * 10. "PM2"
109 * size: 16?
110 * desc: Programmable Memory access register.
111 * This reg. is only used as PMAR.
112 *
113 * 11. "XST"
114 * size: 16?
115 * desc: eXternal STate. Mapped to a15000 and a15002 at 68k side.
116 * Can be programmed as PMAR? (only seen in test mode code)
117 * Affects PM0 when written to?
118 *
119 * 12. "PM4"
120 * size: 16?
121 * desc: Programmable Memory access register.
122 * This reg. is only used as PMAR. The most used PMAR by VR.
123 *
124 * 13. (unused by VR)
125 *
126 * 14. "PMC" (PMC from PMAC name from Tasco's docs)
127 * size: 32?
128 * desc: Programmable Memory access Control. Set using 2 16bit writes,
129 * first address, then mode word. After setting PMAC, PMAR sould
130 * be blind accessed (ld -, PMx or ld PMx, -) to program it for
131 * reading and writing respectively.
132 * Reading the register also shifts it's state (from "waiting for
133 * address" to "waiting for mode" and back). Reads always return
134 * address related to last PMx register accressed.
135 * (note: addresses do not wrap).
136 *
137 * 15. "AL"
138 * size: 16
139 * desc: Accumulator Low. 16 least significant bits of accumulator.
140 * (normally reading acc (ld X, A) you get 16 most significant bits).
141 *
142 *
143 * There are 8 8-bit pointer registers rX. r0-r3 (ri) point to RAM0, r4-r7 (rj) point to RAM1.
144 * They can be accessed directly, or 2 indirection levels can be used [ (rX), ((rX)) ],
145 * which work similar to * and ** operators in C, only they use different memory banks and
146 * ((rX)) also does post-increment. First indirection level (rX) accesses RAMx, second accesses
147 * program memory at address read from (rX), and increments value in (rX).
148 *
149 * r0,r1,r2,r4,r5,r6 can be modified [ex: ldi r0, 5].
150 * 3 modifiers can be applied (optional):
151 * + : post-increment [ex: ld a, (r0+) ]. Can be made modulo-increment by setting RPL bits in ST.
152 * - : post-decrement. Can be made modulo-decrement by setting RPL bits in ST (not sure).
153 * +!: post-increment, unaffected by RPL (probably).
154 * These are only used on 1st indirection level, so things like [ld a, ((r0+))] and [ld X, r6-]
155 * ar probably invalid.
156 *
157 * r3 and r7 are special and can not be changed (at least Samsung samples and VR code never do).
158 * They are fixed to the start of their RAM banks. (They are probably changeable for ssp1605+,
159 * Samsung's old DSP page claims that).
160 * 1 of these 4 modifiers must be used (short form direct addressing?):
161 * |00: RAMx[0] [ex: (r3|00), 0] (based on sample code)
162 * |01: RAMx[1]
163 * |10: RAMx[2] ? maybe 10h? accortding to Div_c_dp.sc, 2
164 * |11: RAMx[3]
165 *
166 *
167 * Instruction notes
168 *
169 * ld a, * doesn't affect flags! (e: A_LAW.SC, Div_c_dp.sc)
170 *
171 * mld (rj), (ri) [, b]
172 * operation: A = 0; P = (rj) * (ri)
173 * notes: based on IIR_4B.SC sample. flags? what is b???
174 *
175 * mpya (rj), (ri) [, b]
176 * name: multiply and add?
177 * operation: A += P; P = (rj) * (ri)
178 *
179 * mpys (rj), (ri), b
180 * name: multiply and subtract?
181 * notes: not used by VR code.
182 *
183 * mod cond, op
184 * mod cond, shr does arithmetic shift
185 *
186 * 'ld -, AL' and probably 'ld AL, -' are for dummy assigns
187 *
188 * memory map:
189 * 000000 - 1fffff ROM, accessable by both
190 * 200000 - 2fffff unused?
191 * 300000 - 31ffff DRAM, both
192 * 320000 - 38ffff unused?
193 * 390000 - 3907ff IRAM. can only be accessed by ssp?
194 * 390000 - 39ffff similar mapping to "cell arrange" in Sega CD, 68k only?
195 * 3a0000 - 3affff similar mapping to "cell arrange" in Sega CD, a bit different
196 *
197 * 30fe02 - 0 if SVP busy, 1 if done (set by SVP, checked and cleared by 68k)
198 * 30fe06 - also sync related.
199 * 30fe08 - job number [1-12] for SVP. 0 means no job. Set by 68k, read-cleared by VR.
200 *
201 * Assumptions and limitations in this code
202 * only Z and N status flags are emulated (others unused by VR)
203 * so all condition checks except N and Z are ignored (not used by VR)
204 * modifiers for 'OP a, ri' and ((ri)) are ignored (not used by VR)
205 * loop repeat mode when (ri) is destination is ignored
206 * ops not used by VR are not implemented
207 */
208
209 #include "../../pico_int.h"
210
211 #define u32 unsigned int
212
213 // 0
214 #define rX ssp->gr[SSP_X].h
215 #define rY ssp->gr[SSP_Y].h
216 #define rA ssp->gr[SSP_A].h
217 #define rST ssp->gr[SSP_ST].h // 4
218 #define rSTACK ssp->gr[SSP_STACK].h
219 #define rPC ssp->gr[SSP_PC].h
220 #define rP ssp->gr[SSP_P]
221 #define rPM0 ssp->gr[SSP_PM0].h // 8
222 #define rPM1 ssp->gr[SSP_PM1].h
223 #define rPM2 ssp->gr[SSP_PM2].h
224 #define rXST ssp->gr[SSP_XST].h
225 #define rPM4 ssp->gr[SSP_PM4].h // 12
226 // 13
227 #define rPMC ssp->gr[SSP_PMC] // will keep addr in .l, mode in .h
228 #define rAL ssp->gr[SSP_A].l
229
230 #define rA32 ssp->gr[SSP_A].v
231 #define rIJ ssp->r
232
233 #define IJind (((op>>6)&4)|(op&3))
234
235 #define GET_PC() (PC - (unsigned short *)svp->iram_rom)
236 #define GET_PPC_OFFS() ((unsigned char *)PC - svp->iram_rom - 2)
237 #define SET_PC(d) PC = (unsigned short *)svp->iram_rom + d
238
239 #define REG_READ(r) (((r) <= 4) ? ssp->gr[r].h : read_handlers[r]())
240 #define REG_WRITE(r,d) { \
241 int r1 = r; \
242 if (r1 >= 4) write_handlers[r1](d); \
243 else if (r1 > 0) ssp->gr[r1].h = d; \
244 }
245
246 // flags
247 #define SSP_FLAG_L (1<<0xc)
248 #define SSP_FLAG_Z (1<<0xd)
249 #define SSP_FLAG_V (1<<0xe)
250 #define SSP_FLAG_N (1<<0xf)
251
252 // update ZN according to 32bit ACC.
253 #define UPD_ACC_ZN \
254 rST &= ~(SSP_FLAG_Z|SSP_FLAG_N); \
255 if (!rA32) rST |= SSP_FLAG_Z; \
256 else rST |= (rA32>>16)&SSP_FLAG_N;
257
258 // it seems SVP code never checks for L and OV, so we leave them out.
259 // rST |= (t>>4)&SSP_FLAG_L;
260 #define UPD_LZVN \
261 rST &= ~(SSP_FLAG_L|SSP_FLAG_Z|SSP_FLAG_V|SSP_FLAG_N); \
262 if (!rA32) rST |= SSP_FLAG_Z; \
263 else rST |= (rA32>>16)&SSP_FLAG_N;
264
265 // standard cond processing.
266 // again, only Z and N is checked, as VR doesn't seem to use any other conds.
267 #define COND_CHECK \
268 switch (op&0xf0) { \
269 case 0x00: cond = 1; break; /* always true */ \
270 case 0x50: cond = !((rST ^ (op<<5)) & SSP_FLAG_Z); break; /* Z matches f(?) bit */ \
271 case 0x70: cond = !((rST ^ (op<<7)) & SSP_FLAG_N); break; /* N matches f(?) bit */ \
272 default:elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: unimplemented cond @ %04x", GET_PPC_OFFS()); break; \
273 }
274
275 // ops with accumulator.
276 // how is low word really affected by these?
277 // nearly sure 'ld A' doesn't affect flags
278 #define OP_LDA(x) \
279 ssp->gr[SSP_A].h = x
280
281 #define OP_LDA32(x) \
282 rA32 = x
283
284 #define OP_SUBA(x) { \
285 rA32 -= (x) << 16; \
286 UPD_LZVN \
287 }
288
289 #define OP_SUBA32(x) { \
290 rA32 -= (x); \
291 UPD_LZVN \
292 }
293
294 #define OP_CMPA(x) { \
295 u32 t = rA32 - ((x) << 16); \
296 rST &= ~(SSP_FLAG_L|SSP_FLAG_Z|SSP_FLAG_V|SSP_FLAG_N); \
297 if (!t) rST |= SSP_FLAG_Z; \
298 else rST |= (t>>16)&SSP_FLAG_N; \
299 }
300
301 #define OP_CMPA32(x) { \
302 u32 t = rA32 - (x); \
303 rST &= ~(SSP_FLAG_L|SSP_FLAG_Z|SSP_FLAG_V|SSP_FLAG_N); \
304 if (!t) rST |= SSP_FLAG_Z; \
305 else rST |= (t>>16)&SSP_FLAG_N; \
306 }
307
308 #define OP_ADDA(x) { \
309 rA32 += (x) << 16; \
310 UPD_LZVN \
311 }
312
313 #define OP_ADDA32(x) { \
314 rA32 += (x); \
315 UPD_LZVN \
316 }
317
318 #define OP_ANDA(x) \
319 rA32 &= (x) << 16; \
320 UPD_ACC_ZN
321
322 #define OP_ANDA32(x) \
323 rA32 &= (x); \
324 UPD_ACC_ZN
325
326 #define OP_ORA(x) \
327 rA32 |= (x) << 16; \
328 UPD_ACC_ZN
329
330 #define OP_ORA32(x) \
331 rA32 |= (x); \
332 UPD_ACC_ZN
333
334 #define OP_EORA(x) \
335 rA32 ^= (x) << 16; \
336 UPD_ACC_ZN
337
338 #define OP_EORA32(x) \
339 rA32 ^= (x); \
340 UPD_ACC_ZN
341
342
343 #define OP_CHECK32(OP) { \
344 if ((op & 0x0f) == SSP_P) { /* A <- P */ \
345 read_P(); /* update P */ \
346 OP(rP.v); \
347 break; \
348 } \
349 if ((op & 0x0f) == SSP_A) { /* A <- A */ \
350 OP(rA32); \
351 break; \
352 } \
353 }
354
355
356 #ifdef DO_CHECKS
357 #define CHECK_IMM16() if (op&0x1ff) elprintf(EL_ANOMALY, "imm bits! %04x @ %04x", op, GET_PPC_OFFS())
358 #define CHECK_B_SET() if (op&0x100) elprintf(EL_ANOMALY, "b set! %04x @ %04x", op, GET_PPC_OFFS())
359 #define CHECK_B_CLEAR() if (!(op&0x100)) elprintf(EL_ANOMALY, "b clear! %04x @ %04x", op, GET_PPC_OFFS())
360 #define CHECK_MOD() if (op&0x00c) elprintf(EL_ANOMALY, "mod bits! %04x @ %04x", op, GET_PPC_OFFS())
361 #define CHECK_10f() if (op&0x10f) elprintf(EL_ANOMALY, "bits 10f! %04x @ %04x", op, GET_PPC_OFFS())
362 #define CHECK_008() if (op&0x008) elprintf(EL_ANOMALY, "bits 008! %04x @ %04x", op, GET_PPC_OFFS())
363 #define CHECK_00f() if (op&0x00f) elprintf(EL_ANOMALY, "bits 00f! %04x @ %04x", op, GET_PPC_OFFS())
364 #define CHECK_0f0() if (op&0x0f0) elprintf(EL_ANOMALY, "bits 0f0! %04x @ %04x", op, GET_PPC_OFFS())
365 #define CHECK_1f0() if (op&0x1f0) elprintf(EL_ANOMALY, "bits 1f0! %04x @ %04x", op, GET_PPC_OFFS())
366 #define CHECK_RPL() if (rST&7) elprintf(EL_ANOMALY, "unhandled RPL! %04x @ %04x", op, GET_PPC_OFFS())
367 #define CHECK_ST(d) if((rST^d)&0xf98)elprintf(EL_ANOMALY, "ssp FIXME ST %04x -> %04x @ %04x", rST, d, GET_PPC_OFFS())
368 #else
369 #define CHECK_IMM16()
370 #define CHECK_B_SET()
371 #define CHECK_B_CLEAR()
372 #define CHECK_MOD()
373 #define CHECK_10f()
374 #define CHECK_008()
375 #define CHECK_00f()
376 #define CHECK_0f0()
377 #define CHECK_1f0()
378 #define CHECK_RPL()
379 #define CHECK_ST(d)
380 #endif
381
382 ssp1601_t *ssp = NULL;
383 static unsigned short *PC;
384 static int g_cycles;
385
386 #ifdef USE_DEBUGGER
387 static int running = 0;
388 static int last_iram = 0;
389 #endif
390
391 // -----------------------------------------------------
392 // register i/o handlers
393
394 // 0-4, 13
read_unknown(void)395 static u32 read_unknown(void)
396 {
397 elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: unknown read @ %04x", GET_PPC_OFFS());
398 return 0;
399 }
400
write_unknown(u32 d)401 static void write_unknown(u32 d)
402 {
403 elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: unknown write @ %04x", GET_PPC_OFFS());
404 }
405
406 // 4
write_ST(u32 d)407 static void write_ST(u32 d)
408 {
409 CHECK_ST(d);
410 rST = d;
411 }
412
413 // 5
read_STACK(void)414 static u32 read_STACK(void)
415 {
416 --rSTACK;
417 if ((short)rSTACK < 0) {
418 rSTACK = 5;
419 elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: stack underflow! (%i) @ %04x", rSTACK, GET_PPC_OFFS());
420 }
421 return ssp->stack[rSTACK];
422 }
423
write_STACK(u32 d)424 static void write_STACK(u32 d)
425 {
426 if (rSTACK >= 6) {
427 elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: stack overflow! (%i) @ %04x", rSTACK, GET_PPC_OFFS());
428 rSTACK = 0;
429 }
430 ssp->stack[rSTACK++] = d;
431 }
432
433 // 6
read_PC(void)434 static u32 read_PC(void)
435 {
436 return GET_PC();
437 }
438
write_PC(u32 d)439 static void write_PC(u32 d)
440 {
441 SET_PC(d);
442 g_cycles--;
443 }
444
445 // 7
read_P(void)446 static u32 read_P(void)
447 {
448 int m1 = (signed short)rX;
449 int m2 = (signed short)rY;
450 rP.v = (m1 * m2 * 2);
451 return rP.h;
452 }
453
454 // -----------------------------------------------------
455
get_inc(int mode)456 static int get_inc(int mode)
457 {
458 int inc = (mode >> 11) & 7;
459 if (inc != 0) {
460 if (inc != 7) inc--;
461 inc = 1 << inc; // 0 1 2 4 8 16 32 128
462 if (mode & 0x8000) inc = -inc; // decrement mode
463 }
464 return inc;
465 }
466
467 #define overwrite_write(dst, d) \
468 { \
469 if (d & 0xf000) { dst &= ~0xf000; dst |= d & 0xf000; } \
470 if (d & 0x0f00) { dst &= ~0x0f00; dst |= d & 0x0f00; } \
471 if (d & 0x00f0) { dst &= ~0x00f0; dst |= d & 0x00f0; } \
472 if (d & 0x000f) { dst &= ~0x000f; dst |= d & 0x000f; } \
473 }
474
pm_io(int reg,int write,u32 d)475 static u32 pm_io(int reg, int write, u32 d)
476 {
477 unsigned int *pmac;
478
479 if (ssp->emu_status & SSP_PMC_SET)
480 {
481 // this MUST be blind r or w
482 if ((*(PC-1) & 0xff0f) && (*(PC-1) & 0xfff0)) {
483 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: tried to set PM%i (%c) with non-blind i/o %08x @ %04x",
484 reg, write ? 'w' : 'r', rPMC.v, GET_PPC_OFFS());
485 ssp->emu_status &= ~SSP_PMC_SET;
486 return 0;
487 }
488 elprintf(EL_SVP, "PM%i (%c) set to %08x @ %04x", reg, write ? 'w' : 'r', rPMC.v, GET_PPC_OFFS());
489 pmac = write ? ssp->pmac_write : ssp->pmac_read;
490 pmac[reg] = rPMC.v;
491 ssp->emu_status &= ~SSP_PMC_SET;
492 if ((rPMC.v & 0x7fffff) == 0x1c8000 || (rPMC.v & 0x7fffff) == 0x1c8240) {
493 elprintf(EL_SVP, "ssp IRAM copy from %06x to %04x", (ssp->RAM1[0]-1)<<1, (rPMC.v&0x7fff)<<1);
494 #ifdef USE_DEBUGGER
495 last_iram = (ssp->RAM1[0]-1)<<1;
496 #endif
497 }
498 return 0;
499 }
500
501 // just in case
502 if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
503 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i (%c) with only addr set @ %04x",
504 reg, write ? 'w' : 'r', GET_PPC_OFFS());
505 ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
506 }
507
508 if (reg == 4 || (rST & 0x60))
509 {
510 #define CADDR ((((mode<<16)&0x7f0000)|addr)<<1)
511 unsigned short *dram = (unsigned short *)svp->dram;
512 if (write)
513 {
514 int mode = ssp->pmac_write[reg]>>16;
515 int addr = ssp->pmac_write[reg]&0xffff;
516 if ((mode & 0xb800) == 0xb800)
517 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: mode %04x", mode);
518 if ((mode & 0x43ff) == 0x0018) // DRAM
519 {
520 int inc = get_inc(mode);
521 elprintf(EL_SVP, "ssp PM%i DRAM w [%06x] %04x (inc %i, ovrw %i)",
522 reg, CADDR, d, inc, (mode>>10)&1);
523 if (mode & 0x0400) {
524 overwrite_write(dram[addr], d);
525 } else dram[addr] = d;
526 ssp->pmac_write[reg] += inc;
527 }
528 else if ((mode & 0xfbff) == 0x4018) // DRAM, cell inc
529 {
530 elprintf(EL_SVP, "ssp PM%i DRAM w [%06x] %04x (cell inc, ovrw %i) @ %04x",
531 reg, CADDR, d, (mode>>10)&1, GET_PPC_OFFS());
532 if (mode & 0x0400) {
533 overwrite_write(dram[addr], d);
534 } else dram[addr] = d;
535 ssp->pmac_write[reg] += (addr&1) ? 31 : 1;
536 }
537 else if ((mode & 0x47ff) == 0x001c) // IRAM
538 {
539 int inc = get_inc(mode);
540 if ((addr&0xfc00) != 0x8000)
541 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: invalid IRAM addr: %04x", addr<<1);
542 elprintf(EL_SVP, "ssp IRAM w [%06x] %04x (inc %i)", (addr<<1)&0x7ff, d, inc);
543 ((unsigned short *)svp->iram_rom)[addr&0x3ff] = d;
544 ssp->pmac_write[reg] += inc;
545 }
546 else
547 {
548 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i unhandled write mode %04x, [%06x] %04x @ %04x",
549 reg, mode, CADDR, d, GET_PPC_OFFS());
550 }
551 }
552 else
553 {
554 int mode = ssp->pmac_read[reg]>>16;
555 int addr = ssp->pmac_read[reg]&0xffff;
556 if ((mode & 0xfff0) == 0x0800) // ROM, inc 1, verified to be correct
557 {
558 elprintf(EL_SVP, "ssp ROM r [%06x] %04x", CADDR,
559 ((unsigned short *)Pico.rom)[addr|((mode&0xf)<<16)]);
560 ssp->pmac_read[reg] += 1;
561 d = ((unsigned short *)Pico.rom)[addr|((mode&0xf)<<16)];
562 }
563 else if ((mode & 0x47ff) == 0x0018) // DRAM
564 {
565 int inc = get_inc(mode);
566 elprintf(EL_SVP, "ssp PM%i DRAM r [%06x] %04x (inc %i)", reg, CADDR, dram[addr]);
567 d = dram[addr];
568 ssp->pmac_read[reg] += inc;
569 }
570 else
571 {
572 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i unhandled read mode %04x, [%06x] @ %04x",
573 reg, mode, CADDR, GET_PPC_OFFS());
574 d = 0;
575 }
576 }
577
578 // PMC value corresponds to last PMR accessed (not sure).
579 pmac = write ? ssp->pmac_write : ssp->pmac_read;
580 rPMC.v = pmac[reg];
581
582 return d;
583 }
584
585 return (u32)-1;
586 }
587
588 // 8
read_PM0(void)589 static u32 read_PM0(void)
590 {
591 u32 d = pm_io(0, 0, 0);
592 if (d != (u32)-1) return d;
593 elprintf(EL_SVP, "PM0 raw r %04x @ %04x", rPM0, GET_PPC_OFFS());
594 d = rPM0;
595 if (!(d & 2) && (GET_PPC_OFFS() == 0x800 || GET_PPC_OFFS() == 0x1851E)) {
596 ssp->emu_status |= SSP_WAIT_PM0; elprintf(EL_SVP, "det TIGHT loop: PM0");
597 }
598 rPM0 &= ~2; // ?
599 return d;
600 }
601
write_PM0(u32 d)602 static void write_PM0(u32 d)
603 {
604 u32 r = pm_io(0, 1, d);
605 if (r != (u32)-1) return;
606 elprintf(EL_SVP, "PM0 raw w %04x @ %04x", d, GET_PPC_OFFS());
607 rPM0 = d;
608 }
609
610 // 9
read_PM1(void)611 static u32 read_PM1(void)
612 {
613 u32 d = pm_io(1, 0, 0);
614 if (d != (u32)-1) return d;
615 // can be removed?
616 elprintf(EL_SVP|EL_ANOMALY, "PM1 raw r %04x @ %04x", rPM1, GET_PPC_OFFS());
617 return rPM1;
618 }
619
write_PM1(u32 d)620 static void write_PM1(u32 d)
621 {
622 u32 r = pm_io(1, 1, d);
623 if (r != (u32)-1) return;
624 // can be removed?
625 elprintf(EL_SVP|EL_ANOMALY, "PM1 raw w %04x @ %04x", d, GET_PPC_OFFS());
626 rPM1 = d;
627 }
628
629 // 10
read_PM2(void)630 static u32 read_PM2(void)
631 {
632 u32 d = pm_io(2, 0, 0);
633 if (d != (u32)-1) return d;
634 // can be removed?
635 elprintf(EL_SVP|EL_ANOMALY, "PM2 raw r %04x @ %04x", rPM2, GET_PPC_OFFS());
636 return rPM2;
637 }
638
write_PM2(u32 d)639 static void write_PM2(u32 d)
640 {
641 u32 r = pm_io(2, 1, d);
642 if (r != (u32)-1) return;
643 // can be removed?
644 elprintf(EL_SVP|EL_ANOMALY, "PM2 raw w %04x @ %04x", d, GET_PPC_OFFS());
645 rPM2 = d;
646 }
647
648 // 11
read_XST(void)649 static u32 read_XST(void)
650 {
651 // can be removed?
652 u32 d = pm_io(3, 0, 0);
653 if (d != (u32)-1) return d;
654
655 elprintf(EL_SVP, "XST raw r %04x @ %04x", rXST, GET_PPC_OFFS());
656 return rXST;
657 }
658
write_XST(u32 d)659 static void write_XST(u32 d)
660 {
661 // can be removed?
662 u32 r = pm_io(3, 1, d);
663 if (r != (u32)-1) return;
664
665 elprintf(EL_SVP, "XST raw w %04x @ %04x", d, GET_PPC_OFFS());
666 rPM0 |= 1;
667 rXST = d;
668 }
669
670 // 12
read_PM4(void)671 static u32 read_PM4(void)
672 {
673 u32 d = pm_io(4, 0, 0);
674
675 if (d == 0) {
676 switch (GET_PPC_OFFS()) {
677 case 0x0854: ssp->emu_status |= SSP_WAIT_30FE08; elprintf(EL_SVP, "det TIGHT loop: [30fe08]"); break;
678 case 0x4f12: ssp->emu_status |= SSP_WAIT_30FE06; elprintf(EL_SVP, "det TIGHT loop: [30fe06]"); break;
679 }
680 }
681
682 if (d != (u32)-1) return d;
683 // can be removed?
684 elprintf(EL_SVP|EL_ANOMALY, "PM4 raw r %04x @ %04x", rPM4, GET_PPC_OFFS());
685 return rPM4;
686 }
687
write_PM4(u32 d)688 static void write_PM4(u32 d)
689 {
690 u32 r = pm_io(4, 1, d);
691 if (r != (u32)-1) return;
692 // can be removed?
693 elprintf(EL_SVP|EL_ANOMALY, "PM4 raw w %04x @ %04x", d, GET_PPC_OFFS());
694 rPM4 = d;
695 }
696
697 // 14
read_PMC(void)698 static u32 read_PMC(void)
699 {
700 elprintf(EL_SVP, "PMC r a %04x (st %c) @ %04x", rPMC.l,
701 (ssp->emu_status & SSP_PMC_HAVE_ADDR) ? 'm' : 'a', GET_PPC_OFFS());
702 if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
703 //if (ssp->emu_status & SSP_PMC_SET)
704 // elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PPC_OFFS());
705 ssp->emu_status |= SSP_PMC_SET;
706 ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
707 return ((rPMC.l << 4) & 0xfff0) | ((rPMC.l >> 4) & 0xf);
708 } else {
709 ssp->emu_status |= SSP_PMC_HAVE_ADDR;
710 return rPMC.l;
711 }
712 }
713
write_PMC(u32 d)714 static void write_PMC(u32 d)
715 {
716 if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
717 //if (ssp->emu_status & SSP_PMC_SET)
718 // elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PPC_OFFS());
719 ssp->emu_status |= SSP_PMC_SET;
720 ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
721 rPMC.h = d;
722 elprintf(EL_SVP, "PMC w m %04x @ %04x", rPMC.h, GET_PPC_OFFS());
723 } else {
724 ssp->emu_status |= SSP_PMC_HAVE_ADDR;
725 rPMC.l = d;
726 elprintf(EL_SVP, "PMC w a %04x @ %04x", rPMC.l, GET_PPC_OFFS());
727 }
728 }
729
730 // 15
read_AL(void)731 static u32 read_AL(void)
732 {
733 if (*(PC-1) == 0x000f)
734 elprintf(EL_SVP, "ssp dummy PM assign %08x @ %04x", rPMC.v, GET_PPC_OFFS());
735 ssp->emu_status &= ~(SSP_PMC_SET|SSP_PMC_HAVE_ADDR); // ?
736 return rAL;
737 }
738
write_AL(u32 d)739 static void write_AL(u32 d)
740 {
741 rAL = d;
742 }
743
744
745 typedef u32 (*read_func_t)(void);
746 typedef void (*write_func_t)(u32 d);
747
748 static read_func_t read_handlers[16] =
749 {
750 read_unknown, read_unknown, read_unknown, read_unknown, // -, X, Y, A
751 read_unknown, // 4 ST
752 read_STACK,
753 read_PC,
754 read_P,
755 read_PM0, // 8
756 read_PM1,
757 read_PM2,
758 read_XST,
759 read_PM4, // 12
760 read_unknown, // 13 gr13
761 read_PMC,
762 read_AL
763 };
764
765 static write_func_t write_handlers[16] =
766 {
767 write_unknown, write_unknown, write_unknown, write_unknown, // -, X, Y, A
768 // write_unknown, // 4 ST
769 write_ST, // 4 ST (debug hook)
770 write_STACK,
771 write_PC,
772 write_unknown, // 7 P
773 write_PM0, // 8
774 write_PM1,
775 write_PM2,
776 write_XST,
777 write_PM4, // 12
778 write_unknown, // 13 gr13
779 write_PMC,
780 write_AL
781 };
782
783 // -----------------------------------------------------
784 // pointer register handlers
785
786 //
787 #define ptr1_read(op) ptr1_read_(op&3,(op>>6)&4,(op<<1)&0x18)
788
ptr1_read_(int ri,int isj2,int modi3)789 static u32 ptr1_read_(int ri, int isj2, int modi3)
790 {
791 //int t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
792 u32 mask, add = 0, t = ri | isj2 | modi3;
793 unsigned char *rp = NULL;
794 switch (t)
795 {
796 // mod=0 (00)
797 case 0x00:
798 case 0x01:
799 case 0x02: return ssp->RAM0[ssp->r0[t&3]];
800 case 0x03: return ssp->RAM0[0];
801 case 0x04:
802 case 0x05:
803 case 0x06: return ssp->RAM1[ssp->r1[t&3]];
804 case 0x07: return ssp->RAM1[0];
805 // mod=1 (01), "+!"
806 case 0x08:
807 case 0x09:
808 case 0x0a: return ssp->RAM0[ssp->r0[t&3]++];
809 case 0x0b: return ssp->RAM0[1];
810 case 0x0c:
811 case 0x0d:
812 case 0x0e: return ssp->RAM1[ssp->r1[t&3]++];
813 case 0x0f: return ssp->RAM1[1];
814 // mod=2 (10), "-"
815 case 0x10:
816 case 0x11:
817 case 0x12: rp = &ssp->r0[t&3]; t = ssp->RAM0[*rp];
818 if (!(rST&7)) { (*rp)--; return t; }
819 add = -1; goto modulo;
820 case 0x13: return ssp->RAM0[2];
821 case 0x14:
822 case 0x15:
823 case 0x16: rp = &ssp->r1[t&3]; t = ssp->RAM1[*rp];
824 if (!(rST&7)) { (*rp)--; return t; }
825 add = -1; goto modulo;
826 case 0x17: return ssp->RAM1[2];
827 // mod=3 (11), "+"
828 case 0x18:
829 case 0x19:
830 case 0x1a: rp = &ssp->r0[t&3]; t = ssp->RAM0[*rp];
831 if (!(rST&7)) { (*rp)++; return t; }
832 add = 1; goto modulo;
833 case 0x1b: return ssp->RAM0[3];
834 case 0x1c:
835 case 0x1d:
836 case 0x1e: rp = &ssp->r1[t&3]; t = ssp->RAM1[*rp];
837 if (!(rST&7)) { (*rp)++; return t; }
838 add = 1; goto modulo;
839 case 0x1f: return ssp->RAM1[3];
840 }
841
842 return 0;
843
844 modulo:
845 mask = (1 << (rST&7)) - 1;
846 *rp = (*rp & ~mask) | ((*rp + add) & mask);
847 return t;
848 }
849
ptr1_write(int op,u32 d)850 static void ptr1_write(int op, u32 d)
851 {
852 int t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
853 switch (t)
854 {
855 // mod=0 (00)
856 case 0x00:
857 case 0x01:
858 case 0x02: ssp->RAM0[ssp->r0[t&3]] = d; return;
859 case 0x03: ssp->RAM0[0] = d; return;
860 case 0x04:
861 case 0x05:
862 case 0x06: ssp->RAM1[ssp->r1[t&3]] = d; return;
863 case 0x07: ssp->RAM1[0] = d; return;
864 // mod=1 (01), "+!"
865 // mod=3, "+"
866 case 0x08:
867 case 0x09:
868 case 0x0a: ssp->RAM0[ssp->r0[t&3]++] = d; return;
869 case 0x0b: ssp->RAM0[1] = d; return;
870 case 0x0c:
871 case 0x0d:
872 case 0x0e: ssp->RAM1[ssp->r1[t&3]++] = d; return;
873 case 0x0f: ssp->RAM1[1] = d; return;
874 // mod=2 (10), "-"
875 case 0x10:
876 case 0x11:
877 case 0x12: ssp->RAM0[ssp->r0[t&3]--] = d; CHECK_RPL(); return;
878 case 0x13: ssp->RAM0[2] = d; return;
879 case 0x14:
880 case 0x15:
881 case 0x16: ssp->RAM1[ssp->r1[t&3]--] = d; CHECK_RPL(); return;
882 case 0x17: ssp->RAM1[2] = d; return;
883 // mod=3 (11), "+"
884 case 0x18:
885 case 0x19:
886 case 0x1a: ssp->RAM0[ssp->r0[t&3]++] = d; CHECK_RPL(); return;
887 case 0x1b: ssp->RAM0[3] = d; return;
888 case 0x1c:
889 case 0x1d:
890 case 0x1e: ssp->RAM1[ssp->r1[t&3]++] = d; CHECK_RPL(); return;
891 case 0x1f: ssp->RAM1[3] = d; return;
892 }
893 }
894
ptr2_read(int op)895 static u32 ptr2_read(int op)
896 {
897 int mv = 0, t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
898 switch (t)
899 {
900 // mod=0 (00)
901 case 0x00:
902 case 0x01:
903 case 0x02: mv = ssp->RAM0[ssp->r0[t&3]]++; break;
904 case 0x03: mv = ssp->RAM0[0]++; break;
905 case 0x04:
906 case 0x05:
907 case 0x06: mv = ssp->RAM1[ssp->r1[t&3]]++; break;
908 case 0x07: mv = ssp->RAM1[0]++; break;
909 // mod=1 (01)
910 case 0x0b: mv = ssp->RAM0[1]++; break;
911 case 0x0f: mv = ssp->RAM1[1]++; break;
912 // mod=2 (10)
913 case 0x13: mv = ssp->RAM0[2]++; break;
914 case 0x17: mv = ssp->RAM1[2]++; break;
915 // mod=3 (11)
916 case 0x1b: mv = ssp->RAM0[3]++; break;
917 case 0x1f: mv = ssp->RAM1[3]++; break;
918 default: elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: invalid mod in ((rX))? @ %04x", GET_PPC_OFFS());
919 return 0;
920 }
921
922 return ((unsigned short *)svp->iram_rom)[mv];
923 }
924
925
926 // -----------------------------------------------------
927
928 #if defined(USE_DEBUGGER)
debug_dump2file(const char * fname,void * mem,int len)929 static void debug_dump2file(const char *fname, void *mem, int len)
930 {
931 FILE *f = fopen(fname, "wb");
932 unsigned short *p = mem;
933 int i;
934 if (f) {
935 for (i = 0; i < len/2; i++) p[i] = (p[i]<<8) | (p[i]>>8);
936 fwrite(mem, 1, len, f);
937 fclose(f);
938 for (i = 0; i < len/2; i++) p[i] = (p[i]<<8) | (p[i]>>8);
939 printf("dumped to %s\n", fname);
940 }
941 else
942 printf("dump failed\n");
943 }
944 #endif
945
946 #ifdef USE_DEBUGGER
debug_dump(void)947 static void debug_dump(void)
948 {
949 printf("GR0: %04x X: %04x Y: %04x A: %08x\n", ssp->gr[SSP_GR0].h, rX, rY, ssp->gr[SSP_A].v);
950 printf("PC: %04x (%04x) P: %08x\n", GET_PC(), GET_PC() << 1, rP.v);
951 printf("PM0: %04x PM1: %04x PM2: %04x\n", rPM0, rPM1, rPM2);
952 printf("XST: %04x PM4: %04x PMC: %08x\n", rXST, rPM4, rPMC.v);
953 printf(" ST: %04x %c%c%c%c, GP0_0 %i, GP0_1 %i\n", rST, rST&SSP_FLAG_N?'N':'n', rST&SSP_FLAG_V?'V':'v',
954 rST&SSP_FLAG_Z?'Z':'z', rST&SSP_FLAG_L?'L':'l', (rST>>5)&1, (rST>>6)&1);
955 printf("STACK: %i %04x %04x %04x %04x %04x %04x\n", rSTACK, ssp->stack[0], ssp->stack[1],
956 ssp->stack[2], ssp->stack[3], ssp->stack[4], ssp->stack[5]);
957 printf("r0-r2: %02x %02x %02x r4-r6: %02x %02x %02x\n", rIJ[0], rIJ[1], rIJ[2], rIJ[4], rIJ[5], rIJ[6]);
958 elprintf(EL_SVP, "cycles: %i, emu_status: %x", g_cycles, ssp->emu_status);
959 }
960
debug_dump_mem(void)961 static void debug_dump_mem(void)
962 {
963 int h, i;
964 printf("RAM0\n");
965 for (h = 0; h < 32; h++)
966 {
967 if (h == 16) printf("RAM1\n");
968 printf("%03x:", h*16);
969 for (i = 0; i < 16; i++)
970 printf(" %04x", ssp->RAM[h*16+i]);
971 printf("\n");
972 }
973 }
974
975 static int bpts[10] = { 0, };
976
debug(unsigned int pc,unsigned int op)977 static void debug(unsigned int pc, unsigned int op)
978 {
979 static char buffo[64] = {0,};
980 char buff[64] = {0,};
981 int i;
982
983 if (running) {
984 for (i = 0; i < 10; i++)
985 if (pc != 0 && bpts[i] == pc) {
986 printf("breakpoint %i\n", i);
987 running = 0;
988 break;
989 }
990 }
991 if (running) return;
992
993 printf("%04x (%02x) @ %04x\n", op, op >> 9, pc<<1);
994
995 while (1)
996 {
997 printf("dbg> ");
998 fflush(stdout);
999 fgets(buff, sizeof(buff), stdin);
1000 if (buff[0] == '\n') strcpy(buff, buffo);
1001 else strcpy(buffo, buff);
1002
1003 switch (buff[0]) {
1004 case 0: exit(0);
1005 case 'c':
1006 case 'r': running = 1; return;
1007 case 's':
1008 case 'n': return;
1009 case 'x': debug_dump(); break;
1010 case 'm': debug_dump_mem(); break;
1011 case 'b': {
1012 char *baddr = buff + 2;
1013 i = 0;
1014 if (buff[3] == ' ') { i = buff[2] - '0'; baddr = buff + 4; }
1015 bpts[i] = strtol(baddr, NULL, 16) >> 1;
1016 printf("breakpoint %i set @ %04x\n", i, bpts[i]<<1);
1017 break;
1018 }
1019 case 'd':
1020 sprintf(buff, "iramrom_%04x.bin", last_iram);
1021 debug_dump2file(buff, svp->iram_rom, sizeof(svp->iram_rom));
1022 debug_dump2file("dram.bin", svp->dram, sizeof(svp->dram));
1023 break;
1024 default: printf("unknown command\n"); break;
1025 }
1026 }
1027 }
1028 #endif // USE_DEBUGGER
1029
1030
ssp1601_reset(ssp1601_t * l_ssp)1031 void ssp1601_reset(ssp1601_t *l_ssp)
1032 {
1033 ssp = l_ssp;
1034 ssp->emu_status = 0;
1035 ssp->gr[SSP_GR0].v = 0xffff0000;
1036 rPC = 0x400;
1037 rSTACK = 0; // ? using ascending stack
1038 rST = 0;
1039 }
1040
1041
ssp1601_run(int cycles)1042 void ssp1601_run(int cycles)
1043 {
1044 SET_PC(rPC);
1045
1046 g_cycles = cycles;
1047
1048 while (g_cycles > 0 && !(ssp->emu_status & SSP_WAIT_MASK))
1049 {
1050 int op;
1051 u32 tmpv;
1052
1053 op = *PC++;
1054 #ifdef USE_DEBUGGER
1055 debug(GET_PC()-1, op);
1056 #endif
1057 switch (op >> 9)
1058 {
1059 // ld d, s
1060 case 0x00:
1061 CHECK_B_SET();
1062 if (op == 0) break; // nop
1063 if (op == ((SSP_A<<4)|SSP_P)) { // A <- P
1064 read_P(); // update P
1065 rA32 = rP.v;
1066 }
1067 else
1068 {
1069 tmpv = REG_READ(op & 0x0f);
1070 REG_WRITE((op & 0xf0) >> 4, tmpv);
1071 }
1072 break;
1073
1074 // ld d, (ri)
1075 case 0x01: tmpv = ptr1_read(op); REG_WRITE((op & 0xf0) >> 4, tmpv); break;
1076
1077 // ld (ri), s
1078 case 0x02: tmpv = REG_READ((op & 0xf0) >> 4); ptr1_write(op, tmpv); break;
1079
1080 // ldi d, imm
1081 case 0x04: CHECK_10f(); tmpv = *PC++; REG_WRITE((op & 0xf0) >> 4, tmpv); g_cycles--; break;
1082
1083 // ld d, ((ri))
1084 case 0x05: CHECK_MOD(); tmpv = ptr2_read(op); REG_WRITE((op & 0xf0) >> 4, tmpv); g_cycles -= 2; break;
1085
1086 // ldi (ri), imm
1087 case 0x06: tmpv = *PC++; ptr1_write(op, tmpv); g_cycles--; break;
1088
1089 // ld adr, a
1090 case 0x07: ssp->RAM[op & 0x1ff] = rA; break;
1091
1092 // ld d, ri
1093 case 0x09: CHECK_MOD(); tmpv = rIJ[(op&3)|((op>>6)&4)]; REG_WRITE((op & 0xf0) >> 4, tmpv); break;
1094
1095 // ld ri, s
1096 case 0x0a: CHECK_MOD(); rIJ[(op&3)|((op>>6)&4)] = REG_READ((op & 0xf0) >> 4); break;
1097
1098 // ldi ri, simm
1099 case 0x0c:
1100 case 0x0d:
1101 case 0x0e:
1102 case 0x0f: rIJ[(op>>8)&7] = op; break;
1103
1104 // call cond, addr
1105 case 0x24: {
1106 int cond = 0;
1107 CHECK_00f();
1108 COND_CHECK
1109 if (cond) { int new_PC = *PC++; write_STACK(GET_PC()); SET_PC(new_PC); }
1110 else PC++;
1111 g_cycles--; // always 2 cycles
1112 break;
1113 }
1114
1115 // ld d, (a)
1116 case 0x25:
1117 CHECK_10f();
1118 tmpv = ((unsigned short *)svp->iram_rom)[rA];
1119 REG_WRITE((op & 0xf0) >> 4, tmpv);
1120 g_cycles -= 2; // 3 cycles total
1121 break;
1122
1123 // bra cond, addr
1124 case 0x26: {
1125 int cond = 0;
1126 CHECK_00f();
1127 COND_CHECK
1128 if (cond) { int new_PC = *PC++; SET_PC(new_PC); }
1129 else PC++;
1130 g_cycles--;
1131 break;
1132 }
1133
1134 // mod cond, op
1135 case 0x48: {
1136 int cond = 0;
1137 CHECK_008();
1138 COND_CHECK
1139 if (cond) {
1140 switch (op & 7) {
1141 case 2: rA32 = (signed int)rA32 >> 1; break; // shr (arithmetic)
1142 case 3: rA32 <<= 1; break; // shl
1143 case 6: rA32 = -(signed int)rA32; break; // neg
1144 case 7: if ((int)rA32 < 0) rA32 = -(signed int)rA32; break; // abs
1145 default: elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: unhandled mod %i @ %04x",
1146 op&7, GET_PPC_OFFS());
1147 }
1148 UPD_ACC_ZN
1149 }
1150 break;
1151 }
1152
1153 // mpys?
1154 case 0x1b:
1155 CHECK_B_CLEAR();
1156 read_P(); // update P
1157 rA32 -= rP.v;
1158 UPD_ACC_ZN
1159 rX = ptr1_read_(op&3, 0, (op<<1)&0x18);
1160 rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18);
1161 break;
1162
1163 // mpya (rj), (ri), b
1164 case 0x4b:
1165 CHECK_B_CLEAR();
1166 read_P(); // update P
1167 rA32 += rP.v;
1168 UPD_ACC_ZN
1169 rX = ptr1_read_(op&3, 0, (op<<1)&0x18);
1170 rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18);
1171 break;
1172
1173 // mld (rj), (ri), b
1174 case 0x5b:
1175 CHECK_B_CLEAR();
1176 rA32 = 0;
1177 rST &= 0x0fff;
1178 rST |= SSP_FLAG_Z;
1179 rX = ptr1_read_(op&3, 0, (op<<1)&0x18);
1180 rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18);
1181 break;
1182
1183 // OP a, s
1184 case 0x10: CHECK_1f0(); OP_CHECK32(OP_SUBA32); tmpv = REG_READ(op & 0x0f); OP_SUBA(tmpv); break;
1185 case 0x30: CHECK_1f0(); OP_CHECK32(OP_CMPA32); tmpv = REG_READ(op & 0x0f); OP_CMPA(tmpv); break;
1186 case 0x40: CHECK_1f0(); OP_CHECK32(OP_ADDA32); tmpv = REG_READ(op & 0x0f); OP_ADDA(tmpv); break;
1187 case 0x50: CHECK_1f0(); OP_CHECK32(OP_ANDA32); tmpv = REG_READ(op & 0x0f); OP_ANDA(tmpv); break;
1188 case 0x60: CHECK_1f0(); OP_CHECK32(OP_ORA32 ); tmpv = REG_READ(op & 0x0f); OP_ORA (tmpv); break;
1189 case 0x70: CHECK_1f0(); OP_CHECK32(OP_EORA32); tmpv = REG_READ(op & 0x0f); OP_EORA(tmpv); break;
1190
1191 // OP a, (ri)
1192 case 0x11: CHECK_0f0(); tmpv = ptr1_read(op); OP_SUBA(tmpv); break;
1193 case 0x31: CHECK_0f0(); tmpv = ptr1_read(op); OP_CMPA(tmpv); break;
1194 case 0x41: CHECK_0f0(); tmpv = ptr1_read(op); OP_ADDA(tmpv); break;
1195 case 0x51: CHECK_0f0(); tmpv = ptr1_read(op); OP_ANDA(tmpv); break;
1196 case 0x61: CHECK_0f0(); tmpv = ptr1_read(op); OP_ORA (tmpv); break;
1197 case 0x71: CHECK_0f0(); tmpv = ptr1_read(op); OP_EORA(tmpv); break;
1198
1199 // OP a, adr
1200 case 0x03: tmpv = ssp->RAM[op & 0x1ff]; OP_LDA (tmpv); break;
1201 case 0x13: tmpv = ssp->RAM[op & 0x1ff]; OP_SUBA(tmpv); break;
1202 case 0x33: tmpv = ssp->RAM[op & 0x1ff]; OP_CMPA(tmpv); break;
1203 case 0x43: tmpv = ssp->RAM[op & 0x1ff]; OP_ADDA(tmpv); break;
1204 case 0x53: tmpv = ssp->RAM[op & 0x1ff]; OP_ANDA(tmpv); break;
1205 case 0x63: tmpv = ssp->RAM[op & 0x1ff]; OP_ORA (tmpv); break;
1206 case 0x73: tmpv = ssp->RAM[op & 0x1ff]; OP_EORA(tmpv); break;
1207
1208 // OP a, imm
1209 case 0x14: CHECK_IMM16(); tmpv = *PC++; OP_SUBA(tmpv); g_cycles--; break;
1210 case 0x34: CHECK_IMM16(); tmpv = *PC++; OP_CMPA(tmpv); g_cycles--; break;
1211 case 0x44: CHECK_IMM16(); tmpv = *PC++; OP_ADDA(tmpv); g_cycles--; break;
1212 case 0x54: CHECK_IMM16(); tmpv = *PC++; OP_ANDA(tmpv); g_cycles--; break;
1213 case 0x64: CHECK_IMM16(); tmpv = *PC++; OP_ORA (tmpv); g_cycles--; break;
1214 case 0x74: CHECK_IMM16(); tmpv = *PC++; OP_EORA(tmpv); g_cycles--; break;
1215
1216 // OP a, ((ri))
1217 case 0x15: CHECK_MOD(); tmpv = ptr2_read(op); OP_SUBA(tmpv); g_cycles -= 2; break;
1218 case 0x35: CHECK_MOD(); tmpv = ptr2_read(op); OP_CMPA(tmpv); g_cycles -= 2; break;
1219 case 0x45: CHECK_MOD(); tmpv = ptr2_read(op); OP_ADDA(tmpv); g_cycles -= 2; break;
1220 case 0x55: CHECK_MOD(); tmpv = ptr2_read(op); OP_ANDA(tmpv); g_cycles -= 2; break;
1221 case 0x65: CHECK_MOD(); tmpv = ptr2_read(op); OP_ORA (tmpv); g_cycles -= 2; break;
1222 case 0x75: CHECK_MOD(); tmpv = ptr2_read(op); OP_EORA(tmpv); g_cycles -= 2; break;
1223
1224 // OP a, ri
1225 case 0x19: CHECK_MOD(); tmpv = rIJ[IJind]; OP_SUBA(tmpv); break;
1226 case 0x39: CHECK_MOD(); tmpv = rIJ[IJind]; OP_CMPA(tmpv); break;
1227 case 0x49: CHECK_MOD(); tmpv = rIJ[IJind]; OP_ADDA(tmpv); break;
1228 case 0x59: CHECK_MOD(); tmpv = rIJ[IJind]; OP_ANDA(tmpv); break;
1229 case 0x69: CHECK_MOD(); tmpv = rIJ[IJind]; OP_ORA (tmpv); break;
1230 case 0x79: CHECK_MOD(); tmpv = rIJ[IJind]; OP_EORA(tmpv); break;
1231
1232 // OP simm
1233 case 0x1c: CHECK_B_SET(); OP_SUBA(op & 0xff); break;
1234 case 0x3c: CHECK_B_SET(); OP_CMPA(op & 0xff); break;
1235 case 0x4c: CHECK_B_SET(); OP_ADDA(op & 0xff); break;
1236 case 0x5c: CHECK_B_SET(); OP_ANDA(op & 0xff); break;
1237 case 0x6c: CHECK_B_SET(); OP_ORA (op & 0xff); break;
1238 case 0x7c: CHECK_B_SET(); OP_EORA(op & 0xff); break;
1239
1240 default:
1241 elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME unhandled op %04x @ %04x", op, GET_PPC_OFFS());
1242 break;
1243 }
1244 g_cycles--;
1245 }
1246
1247 rPC = GET_PC();
1248 read_P(); // update P
1249 }
1250
1251