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sh2: handle some branch exceptions
[picodrive.git] / pico / carthw / svp / ssp16.c
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cff531af 1/*
2 * basic, incomplete SSP160x (SSP1601?) interpreter
3 * with SVP memory controller emu
4 *
5 * Copyright (c) GraÅžvydas "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 */
d4ca252d 29
e477f8f7 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
f8ef8ff7 35/*
36 * Register info
f8ef8ff7 37 *
38 * 0. "-"
39 * size: 16
40 * desc: Constant register with all bits set (0xffff).
41 *
42 * 1. "X"
43 * size: 16
d4ca252d 44 * desc: Generic register. When set, updates P (P = X * Y * 2)
f8ef8ff7 45 *
46 * 2. "Y"
47 * size: 16
d4ca252d 48 * desc: Generic register. When set, updates P (P = X * Y * 2)
f8ef8ff7 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
5de27868 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)
f8ef8ff7 62 * 43 - RB (?)
5de27868 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))
f8ef8ff7 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
d4ca252d 92 * desc: multiply result register. P = X * Y * 2
f8ef8ff7 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,
d26dc685 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)
f8ef8ff7 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?
d26dc685 115 * desc: eXternal STate. Mapped to a15000 and a15002 at 68k side.
f8ef8ff7 116 * Can be programmed as PMAR? (only seen in test mode code)
d26dc685 117 * Affects PM0 when written to?
f8ef8ff7 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
3554b0a4 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.
689fb2c0 135 * (note: addresses do not wrap).
f8ef8ff7 136 *
137 * 15. "AL"
138 * size: 16
d4ca252d 139 * desc: Accumulator Low. 16 least significant bits of accumulator.
f8ef8ff7 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.
5de27868 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).
f8ef8ff7 148 *
149 * r0,r1,r2,r4,r5,r6 can be modified [ex: ldi r0, 5].
150 * 3 modifiers can be applied (optional):
5de27868 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.
f8ef8ff7 156 *
e477f8f7 157 * r3 and r7 are special and can not be changed (at least Samsung samples and VR code never do).
f8ef8ff7 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 *
d26dc685 169 * ld a, * doesn't affect flags! (e: A_LAW.SC, Div_c_dp.sc)
170 *
f8ef8ff7 171 * mld (rj), (ri) [, b]
172 * operation: A = 0; P = (rj) * (ri)
173 * notes: based on IIR_4B.SC sample. flags? what is b???
f8ef8ff7 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.
017512f2 182 *
d26dc685 183 * mod cond, op
184 * mod cond, shr does arithmetic shift
30752975 185 *
67256d4b 186 * 'ld -, AL' and probably 'ld AL, -' are for dummy assigns
187 *
30752975 188 * memory map:
189 * 000000 - 1fffff ROM, accessable by both
190 * 200000 - 2fffff unused?
d26dc685 191 * 300000 - 31ffff DRAM, both
30752975 192 * 320000 - 38ffff unused?
193 * 390000 - 3907ff IRAM. can only be accessed by ssp?
d26dc685 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
30752975 196 *
197 * 30fe02 - 0 if SVP busy, 1 if done (set by SVP, checked and cleared by 68k)
198 * 30fe06 - also sync related.
e477f8f7 199 * 30fe08 - job number [1-12] for SVP. 0 means no job. Set by 68k, read-cleared by VR.
67256d4b 200 *
e477f8f7 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
f8ef8ff7 207 */
208
efcba75f 209#include "../../pico_int.h"
f8ef8ff7 210
017512f2 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
6b6a3e50 227#define rPMC ssp->gr[SSP_PMC] // will keep addr in .l, mode in .h
f8ef8ff7 228#define rAL ssp->gr[SSP_A].l
229
5de27868 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)
b8a1c09a 236#define GET_PPC_OFFS() ((unsigned char *)PC - svp->iram_rom - 2)
5de27868 237#define SET_PC(d) PC = (unsigned short *)svp->iram_rom + d
017512f2 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; \
5de27868 242 if (r1 >= 4) write_handlers[r1](d); \
017512f2 243 else if (r1 > 0) ssp->gr[r1].h = d; \
244}
245
5de27868 246// flags
d26dc685 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)
5de27868 251
252// update ZN according to 32bit ACC.
253#define UPD_ACC_ZN \
d26dc685 254 rST &= ~(SSP_FLAG_Z|SSP_FLAG_N); \
255 if (!rA32) rST |= SSP_FLAG_Z; \
256 else rST |= (rA32>>16)&SSP_FLAG_N;
5de27868 257
258// it seems SVP code never checks for L and OV, so we leave them out.
d26dc685 259// rST |= (t>>4)&SSP_FLAG_L;
67256d4b 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
5de27868 265// standard cond processing.
e477f8f7 266// again, only Z and N is checked, as VR doesn't seem to use any other conds.
5de27868 267#define COND_CHECK \
268 switch (op&0xf0) { \
269 case 0x00: cond = 1; break; /* always true */ \
d26dc685 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 */ \
689fb2c0 272 default:elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: unimplemented cond @ %04x", GET_PPC_OFFS()); break; \
5de27868 273 }
274
275// ops with accumulator.
276// how is low word really affected by these?
30752975 277// nearly sure 'ld A' doesn't affect flags
5de27868 278#define OP_LDA(x) \
30752975 279 ssp->gr[SSP_A].h = x
5de27868 280
67256d4b 281#define OP_LDA32(x) \
4bfc6da4 282 rA32 = x
67256d4b 283
5de27868 284#define OP_SUBA(x) { \
4bfc6da4 285 rA32 -= (x) << 16; \
286 UPD_LZVN \
5de27868 287}
288
67256d4b 289#define OP_SUBA32(x) { \
4bfc6da4 290 rA32 -= (x); \
67256d4b 291 UPD_LZVN \
292}
293
5de27868 294#define OP_CMPA(x) { \
4bfc6da4 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; \
5de27868 299}
300
67256d4b 301#define OP_CMPA32(x) { \
4bfc6da4 302 u32 t = rA32 - (x); \
67256d4b 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
5de27868 308#define OP_ADDA(x) { \
4bfc6da4 309 rA32 += (x) << 16; \
310 UPD_LZVN \
5de27868 311}
312
67256d4b 313#define OP_ADDA32(x) { \
4bfc6da4 314 rA32 += (x); \
67256d4b 315 UPD_LZVN \
316}
317
5de27868 318#define OP_ANDA(x) \
4bfc6da4 319 rA32 &= (x) << 16; \
5de27868 320 UPD_ACC_ZN
321
67256d4b 322#define OP_ANDA32(x) \
4bfc6da4 323 rA32 &= (x); \
67256d4b 324 UPD_ACC_ZN
325
5de27868 326#define OP_ORA(x) \
4bfc6da4 327 rA32 |= (x) << 16; \
5de27868 328 UPD_ACC_ZN
329
67256d4b 330#define OP_ORA32(x) \
4bfc6da4 331 rA32 |= (x); \
67256d4b 332 UPD_ACC_ZN
333
5de27868 334#define OP_EORA(x) \
4bfc6da4 335 rA32 ^= (x) << 16; \
5de27868 336 UPD_ACC_ZN
337
67256d4b 338#define OP_EORA32(x) \
4bfc6da4 339 rA32 ^= (x); \
67256d4b 340 UPD_ACC_ZN
341
342
e477f8f7 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 } \
67256d4b 353}
354
5de27868 355
e477f8f7 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
e807ac75 382ssp1601_t *ssp = NULL;
017512f2 383static unsigned short *PC;
384static int g_cycles;
3554b0a4 385
386#ifdef USE_DEBUGGER
5de27868 387static int running = 0;
30752975 388static int last_iram = 0;
3554b0a4 389#endif
017512f2 390
391// -----------------------------------------------------
392// register i/o handlers
393
394// 0-4, 13
395static u32 read_unknown(void)
396{
3554b0a4 397 elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: unknown read @ %04x", GET_PPC_OFFS());
017512f2 398 return 0;
399}
400
401static void write_unknown(u32 d)
402{
3554b0a4 403 elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: unknown write @ %04x", GET_PPC_OFFS());
5de27868 404}
405
406// 4
407static void write_ST(u32 d)
408{
e477f8f7 409 CHECK_ST(d);
5de27868 410 rST = d;
017512f2 411}
412
413// 5
414static u32 read_STACK(void)
415{
5de27868 416 --rSTACK;
417 if ((short)rSTACK < 0) {
418 rSTACK = 5;
3554b0a4 419 elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: stack underflow! (%i) @ %04x", rSTACK, GET_PPC_OFFS());
5de27868 420 }
421 return ssp->stack[rSTACK];
017512f2 422}
423
424static void write_STACK(u32 d)
425{
5de27868 426 if (rSTACK >= 6) {
3554b0a4 427 elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: stack overflow! (%i) @ %04x", rSTACK, GET_PPC_OFFS());
5de27868 428 rSTACK = 0;
429 }
430 ssp->stack[rSTACK++] = d;
017512f2 431}
432
433// 6
434static u32 read_PC(void)
435{
436 return GET_PC();
437}
438
439static void write_PC(u32 d)
440{
441 SET_PC(d);
442 g_cycles--;
443}
444
445// 7
446static u32 read_P(void)
447{
4fd5325d 448 int m1 = (signed short)rX;
449 int m2 = (signed short)rY;
3554b0a4 450 rP.v = (m1 * m2 * 2);
017512f2 451 return rP.h;
452}
453
5de27868 454// -----------------------------------------------------
455
3554b0a4 456static int get_inc(int mode)
5de27868 457{
3554b0a4 458 int inc = (mode >> 11) & 7;
459 if (inc != 0) {
460 if (inc != 7) inc--;
6b6a3e50 461 inc = 1 << inc; // 0 1 2 4 8 16 32 128
3554b0a4 462 if (mode & 0x8000) inc = -inc; // decrement mode
463 }
464 return inc;
5de27868 465}
466
ede7220f 467#define overwrite_write(dst, d) \
d26dc685 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
017512f2 475static u32 pm_io(int reg, int write, u32 d)
476{
67256d4b 477 if (ssp->emu_status & SSP_PMC_SET)
478 {
479 // this MUST be blind r or w
480 if ((*(PC-1) & 0xff0f) && (*(PC-1) & 0xfff0)) {
3554b0a4 481 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: tried to set PM%i (%c) with non-blind i/o %08x @ %04x",
67256d4b 482 reg, write ? 'w' : 'r', rPMC.v, GET_PPC_OFFS());
483 ssp->emu_status &= ~SSP_PMC_SET;
484 return 0;
485 }
5de27868 486 elprintf(EL_SVP, "PM%i (%c) set to %08x @ %04x", reg, write ? 'w' : 'r', rPMC.v, GET_PPC_OFFS());
017512f2 487 ssp->pmac_read[write ? reg + 6 : reg] = rPMC.v;
488 ssp->emu_status &= ~SSP_PMC_SET;
12f0f94d 489 if ((rPMC.v & 0x7fffff) == 0x1c8000 || (rPMC.v & 0x7fffff) == 0x1c8240) {
bad5731d 490 elprintf(EL_SVP, "ssp IRAM copy from %06x to %04x", (ssp->RAM1[0]-1)<<1, (rPMC.v&0x7fff)<<1);
3554b0a4 491#ifdef USE_DEBUGGER
30752975 492 last_iram = (ssp->RAM1[0]-1)<<1;
3554b0a4 493#endif
30752975 494 }
017512f2 495 return 0;
496 }
497
5de27868 498 // just in case
67256d4b 499 if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
3554b0a4 500 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i (%c) with only addr set @ %04x",
67256d4b 501 reg, write ? 'w' : 'r', GET_PPC_OFFS());
502 ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
503 }
5de27868 504
5de27868 505 if (reg == 4 || (rST & 0x60))
506 {
30752975 507 #define CADDR ((((mode<<16)&0x7f0000)|addr)<<1)
d26dc685 508 unsigned short *dram = (unsigned short *)svp->dram;
5de27868 509 if (write)
510 {
6b6a3e50 511 int mode = ssp->pmac_write[reg]>>16;
512 int addr = ssp->pmac_write[reg]&0xffff;
3554b0a4 513 if ((mode & 0xb800) == 0xb800)
689fb2c0 514 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: mode %04x", mode);
3554b0a4 515 if ((mode & 0x43ff) == 0x0018) // DRAM
516 {
517 int inc = get_inc(mode);
518 elprintf(EL_SVP, "ssp PM%i DRAM w [%06x] %04x (inc %i, ovrw %i)",
6b6a3e50 519 reg, CADDR, d, inc, (mode>>10)&1);
3554b0a4 520 if (mode & 0x0400) {
ede7220f 521 overwrite_write(dram[addr], d);
3554b0a4 522 } else dram[addr] = d;
523 ssp->pmac_write[reg] += inc;
524 }
525 else if ((mode & 0xfbff) == 0x4018) // DRAM, cell inc
526 {
527 elprintf(EL_SVP, "ssp PM%i DRAM w [%06x] %04x (cell inc, ovrw %i) @ %04x",
528 reg, CADDR, d, (mode>>10)&1, GET_PPC_OFFS());
529 if (mode & 0x0400) {
ede7220f 530 overwrite_write(dram[addr], d);
3554b0a4 531 } else dram[addr] = d;
6b6a3e50 532 ssp->pmac_write[reg] += (addr&1) ? 31 : 1;
3554b0a4 533 }
534 else if ((mode & 0x47ff) == 0x001c) // IRAM
535 {
536 int inc = get_inc(mode);
537 if ((addr&0xfc00) != 0x8000)
538 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: invalid IRAM addr: %04x", addr<<1);
6b6a3e50 539 elprintf(EL_SVP, "ssp IRAM w [%06x] %04x (inc %i)", (addr<<1)&0x7ff, d, inc);
3554b0a4 540 ((unsigned short *)svp->iram_rom)[addr&0x3ff] = d;
541 ssp->pmac_write[reg] += inc;
542 }
543 else
544 {
545 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i unhandled write mode %04x, [%06x] %04x @ %04x",
546 reg, mode, CADDR, d, GET_PPC_OFFS());
5de27868 547 }
548 }
549 else
550 {
6b6a3e50 551 int mode = ssp->pmac_read[reg]>>16;
552 int addr = ssp->pmac_read[reg]&0xffff;
3554b0a4 553 if ((mode & 0xfff0) == 0x0800) // ROM, inc 1, verified to be correct
554 {
d26dc685 555 elprintf(EL_SVP, "ssp ROM r [%06x] %04x", CADDR,
556 ((unsigned short *)Pico.rom)[addr|((mode&0xf)<<16)]);
6b6a3e50 557 ssp->pmac_read[reg] += 1;
d26dc685 558 d = ((unsigned short *)Pico.rom)[addr|((mode&0xf)<<16)];
d26dc685 559 }
3554b0a4 560 else if ((mode & 0x47ff) == 0x0018) // DRAM
561 {
562 int inc = get_inc(mode);
6b6a3e50 563 elprintf(EL_SVP, "ssp PM%i DRAM r [%06x] %04x (inc %i)", reg, CADDR, dram[addr]);
3554b0a4 564 d = dram[addr];
565 ssp->pmac_read[reg] += inc;
566 }
567 else
568 {
569 elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i unhandled read mode %04x, [%06x] @ %04x",
570 reg, mode, CADDR, GET_PPC_OFFS());
571 d = 0;
5de27868 572 }
573 }
30752975 574
575 // PMC value corresponds to last PMR accessed (not sure).
576 rPMC.v = ssp->pmac_read[write ? reg + 6 : reg];
577
578 return d;
017512f2 579 }
580
581 return (u32)-1;
582}
583
584// 8
585static u32 read_PM0(void)
586{
587 u32 d = pm_io(0, 0, 0);
588 if (d != (u32)-1) return d;
67256d4b 589 elprintf(EL_SVP, "PM0 raw r %04x @ %04x", rPM0, GET_PPC_OFFS());
d26dc685 590 d = rPM0;
591 if (!(d & 2) && (GET_PPC_OFFS() == 0x800 || GET_PPC_OFFS() == 0x1851E)) {
592 ssp->emu_status |= SSP_WAIT_PM0; elprintf(EL_SVP, "det TIGHT loop: PM0");
593 }
594 rPM0 &= ~2; // ?
595 return d;
017512f2 596}
597
598static void write_PM0(u32 d)
599{
600 u32 r = pm_io(0, 1, d);
601 if (r != (u32)-1) return;
5de27868 602 elprintf(EL_SVP, "PM0 raw w %04x @ %04x", d, GET_PPC_OFFS());
d26dc685 603 rPM0 = d;
017512f2 604}
605
606// 9
607static u32 read_PM1(void)
608{
609 u32 d = pm_io(1, 0, 0);
610 if (d != (u32)-1) return d;
611 // can be removed?
d4ca252d 612 elprintf(EL_SVP|EL_ANOMALY, "PM1 raw r %04x @ %04x", rPM1, GET_PPC_OFFS());
5de27868 613 return rPM1;
017512f2 614}
615
616static void write_PM1(u32 d)
617{
618 u32 r = pm_io(1, 1, d);
619 if (r != (u32)-1) return;
620 // can be removed?
d4ca252d 621 elprintf(EL_SVP|EL_ANOMALY, "PM1 raw w %04x @ %04x", d, GET_PPC_OFFS());
5de27868 622 rPM1 = d;
017512f2 623}
624
625// 10
626static u32 read_PM2(void)
627{
628 u32 d = pm_io(2, 0, 0);
629 if (d != (u32)-1) return d;
630 // can be removed?
d4ca252d 631 elprintf(EL_SVP|EL_ANOMALY, "PM2 raw r %04x @ %04x", rPM2, GET_PPC_OFFS());
5de27868 632 return rPM2;
017512f2 633}
634
635static void write_PM2(u32 d)
636{
637 u32 r = pm_io(2, 1, d);
638 if (r != (u32)-1) return;
639 // can be removed?
d4ca252d 640 elprintf(EL_SVP|EL_ANOMALY, "PM2 raw w %04x @ %04x", d, GET_PPC_OFFS());
5de27868 641 rPM2 = d;
017512f2 642}
643
644// 11
645static u32 read_XST(void)
646{
647 // can be removed?
648 u32 d = pm_io(3, 0, 0);
649 if (d != (u32)-1) return d;
650
5de27868 651 elprintf(EL_SVP, "XST raw r %04x @ %04x", rXST, GET_PPC_OFFS());
652 return rXST;
017512f2 653}
f8ef8ff7 654
017512f2 655static void write_XST(u32 d)
f8ef8ff7 656{
017512f2 657 // can be removed?
658 u32 r = pm_io(3, 1, d);
659 if (r != (u32)-1) return;
660
5de27868 661 elprintf(EL_SVP, "XST raw w %04x @ %04x", d, GET_PPC_OFFS());
d26dc685 662 rPM0 |= 1;
5de27868 663 rXST = d;
017512f2 664}
665
666// 12
667static u32 read_PM4(void)
668{
669 u32 d = pm_io(4, 0, 0);
72f63cf0 670
30752975 671 if (d == 0) {
672 switch (GET_PPC_OFFS()) {
d26dc685 673 case 0x0854: ssp->emu_status |= SSP_WAIT_30FE08; elprintf(EL_SVP, "det TIGHT loop: [30fe08]"); break;
674 case 0x4f12: ssp->emu_status |= SSP_WAIT_30FE06; elprintf(EL_SVP, "det TIGHT loop: [30fe06]"); break;
30752975 675 }
676 }
72f63cf0 677
017512f2 678 if (d != (u32)-1) return d;
679 // can be removed?
d4ca252d 680 elprintf(EL_SVP|EL_ANOMALY, "PM4 raw r %04x @ %04x", rPM4, GET_PPC_OFFS());
5de27868 681 return rPM4;
017512f2 682}
683
684static void write_PM4(u32 d)
685{
686 u32 r = pm_io(4, 1, d);
687 if (r != (u32)-1) return;
688 // can be removed?
d4ca252d 689 elprintf(EL_SVP|EL_ANOMALY, "PM4 raw w %04x @ %04x", d, GET_PPC_OFFS());
5de27868 690 rPM4 = d;
017512f2 691}
692
693// 14
694static u32 read_PMC(void)
695{
6b6a3e50 696 elprintf(EL_SVP, "PMC r a %04x (st %c) @ %04x", rPMC.l,
3554b0a4 697 (ssp->emu_status & SSP_PMC_HAVE_ADDR) ? 'm' : 'a', GET_PPC_OFFS());
017512f2 698 if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
3554b0a4 699 //if (ssp->emu_status & SSP_PMC_SET)
700 // elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PPC_OFFS());
017512f2 701 ssp->emu_status |= SSP_PMC_SET;
5de27868 702 ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
6b6a3e50 703 return ((rPMC.l << 4) & 0xfff0) | ((rPMC.l >> 4) & 0xf);
017512f2 704 } else {
705 ssp->emu_status |= SSP_PMC_HAVE_ADDR;
6b6a3e50 706 return rPMC.l;
017512f2 707 }
708}
709
710static void write_PMC(u32 d)
711{
712 if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
3554b0a4 713 //if (ssp->emu_status & SSP_PMC_SET)
714 // elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PPC_OFFS());
017512f2 715 ssp->emu_status |= SSP_PMC_SET;
5de27868 716 ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
6b6a3e50 717 rPMC.h = d;
718 elprintf(EL_SVP, "PMC w m %04x @ %04x", rPMC.h, GET_PPC_OFFS());
017512f2 719 } else {
720 ssp->emu_status |= SSP_PMC_HAVE_ADDR;
6b6a3e50 721 rPMC.l = d;
722 elprintf(EL_SVP, "PMC w a %04x @ %04x", rPMC.l, GET_PPC_OFFS());
017512f2 723 }
724}
725
726// 15
727static u32 read_AL(void)
728{
6e39239f 729 if (*(PC-1) == 0x000f)
689fb2c0 730 elprintf(EL_SVP, "ssp dummy PM assign %08x @ %04x", rPMC.v, GET_PPC_OFFS());
6e39239f 731 ssp->emu_status &= ~(SSP_PMC_SET|SSP_PMC_HAVE_ADDR); // ?
017512f2 732 return rAL;
733}
734
735static void write_AL(u32 d)
736{
737 rAL = d;
738}
739
740
741typedef u32 (*read_func_t)(void);
742typedef void (*write_func_t)(u32 d);
743
744static read_func_t read_handlers[16] =
745{
746 read_unknown, read_unknown, read_unknown, read_unknown, // -, X, Y, A
747 read_unknown, // 4 ST
748 read_STACK,
749 read_PC,
750 read_P,
751 read_PM0, // 8
752 read_PM1,
753 read_PM2,
754 read_XST,
755 read_PM4, // 12
756 read_unknown, // 13 gr13
757 read_PMC,
758 read_AL
759};
760
761static write_func_t write_handlers[16] =
762{
763 write_unknown, write_unknown, write_unknown, write_unknown, // -, X, Y, A
5de27868 764// write_unknown, // 4 ST
765 write_ST, // 4 ST (debug hook)
017512f2 766 write_STACK,
767 write_PC,
768 write_unknown, // 7 P
769 write_PM0, // 8
770 write_PM1,
771 write_PM2,
772 write_XST,
773 write_PM4, // 12
774 write_unknown, // 13 gr13
775 write_PMC,
776 write_AL
777};
778
5de27868 779// -----------------------------------------------------
780// pointer register handlers
781
782//
783#define ptr1_read(op) ptr1_read_(op&3,(op>>6)&4,(op<<1)&0x18)
784
785static u32 ptr1_read_(int ri, int isj2, int modi3)
786{
787 //int t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
30752975 788 u32 mask, add = 0, t = ri | isj2 | modi3;
789 unsigned char *rp = NULL;
5de27868 790 switch (t)
791 {
792 // mod=0 (00)
793 case 0x00:
794 case 0x01:
795 case 0x02: return ssp->RAM0[ssp->r0[t&3]];
796 case 0x03: return ssp->RAM0[0];
797 case 0x04:
798 case 0x05:
799 case 0x06: return ssp->RAM1[ssp->r1[t&3]];
800 case 0x07: return ssp->RAM1[0];
801 // mod=1 (01), "+!"
5de27868 802 case 0x08:
5de27868 803 case 0x09:
30752975 804 case 0x0a: return ssp->RAM0[ssp->r0[t&3]++];
5de27868 805 case 0x0b: return ssp->RAM0[1];
806 case 0x0c:
5de27868 807 case 0x0d:
30752975 808 case 0x0e: return ssp->RAM1[ssp->r1[t&3]++];
5de27868 809 case 0x0f: return ssp->RAM1[1];
810 // mod=2 (10), "-"
811 case 0x10:
812 case 0x11:
30752975 813 case 0x12: rp = &ssp->r0[t&3]; t = ssp->RAM0[*rp];
814 if (!(rST&7)) { (*rp)--; return t; }
815 add = -1; goto modulo;
5de27868 816 case 0x13: return ssp->RAM0[2];
817 case 0x14:
818 case 0x15:
30752975 819 case 0x16: rp = &ssp->r1[t&3]; t = ssp->RAM1[*rp];
820 if (!(rST&7)) { (*rp)--; return t; }
821 add = -1; goto modulo;
5de27868 822 case 0x17: return ssp->RAM1[2];
30752975 823 // mod=3 (11), "+"
824 case 0x18:
825 case 0x19:
826 case 0x1a: rp = &ssp->r0[t&3]; t = ssp->RAM0[*rp];
827 if (!(rST&7)) { (*rp)++; return t; }
828 add = 1; goto modulo;
5de27868 829 case 0x1b: return ssp->RAM0[3];
30752975 830 case 0x1c:
831 case 0x1d:
832 case 0x1e: rp = &ssp->r1[t&3]; t = ssp->RAM1[*rp];
833 if (!(rST&7)) { (*rp)++; return t; }
834 add = 1; goto modulo;
5de27868 835 case 0x1f: return ssp->RAM1[3];
836 }
837
838 return 0;
30752975 839
840modulo:
841 mask = (1 << (rST&7)) - 1;
842 *rp = (*rp & ~mask) | ((*rp + add) & mask);
843 return t;
5de27868 844}
845
846static void ptr1_write(int op, u32 d)
847{
848 int t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
849 switch (t)
850 {
851 // mod=0 (00)
852 case 0x00:
853 case 0x01:
854 case 0x02: ssp->RAM0[ssp->r0[t&3]] = d; return;
855 case 0x03: ssp->RAM0[0] = d; return;
856 case 0x04:
857 case 0x05:
858 case 0x06: ssp->RAM1[ssp->r1[t&3]] = d; return;
859 case 0x07: ssp->RAM1[0] = d; return;
860 // mod=1 (01), "+!"
861 // mod=3, "+"
862 case 0x08:
5de27868 863 case 0x09:
e477f8f7 864 case 0x0a: ssp->RAM0[ssp->r0[t&3]++] = d; return;
5de27868 865 case 0x0b: ssp->RAM0[1] = d; return;
866 case 0x0c:
5de27868 867 case 0x0d:
e477f8f7 868 case 0x0e: ssp->RAM1[ssp->r1[t&3]++] = d; return;
5de27868 869 case 0x0f: ssp->RAM1[1] = d; return;
870 // mod=2 (10), "-"
871 case 0x10:
872 case 0x11:
e477f8f7 873 case 0x12: ssp->RAM0[ssp->r0[t&3]--] = d; CHECK_RPL(); return;
5de27868 874 case 0x13: ssp->RAM0[2] = d; return;
875 case 0x14:
876 case 0x15:
e477f8f7 877 case 0x16: ssp->RAM1[ssp->r1[t&3]--] = d; CHECK_RPL(); return;
5de27868 878 case 0x17: ssp->RAM1[2] = d; return;
e477f8f7 879 // mod=3 (11), "+"
880 case 0x18:
881 case 0x19:
882 case 0x1a: ssp->RAM0[ssp->r0[t&3]++] = d; CHECK_RPL(); return;
5de27868 883 case 0x1b: ssp->RAM0[3] = d; return;
e477f8f7 884 case 0x1c:
885 case 0x1d:
886 case 0x1e: ssp->RAM1[ssp->r1[t&3]++] = d; CHECK_RPL(); return;
5de27868 887 case 0x1f: ssp->RAM1[3] = d; return;
888 }
889}
890
891static u32 ptr2_read(int op)
892{
893 int mv = 0, t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
894 switch (t)
895 {
896 // mod=0 (00)
897 case 0x00:
898 case 0x01:
899 case 0x02: mv = ssp->RAM0[ssp->r0[t&3]]++; break;
900 case 0x03: mv = ssp->RAM0[0]++; break;
901 case 0x04:
902 case 0x05:
903 case 0x06: mv = ssp->RAM1[ssp->r1[t&3]]++; break;
904 case 0x07: mv = ssp->RAM1[0]++; break;
905 // mod=1 (01)
906 case 0x0b: mv = ssp->RAM0[1]++; break;
907 case 0x0f: mv = ssp->RAM1[1]++; break;
908 // mod=2 (10)
909 case 0x13: mv = ssp->RAM0[2]++; break;
910 case 0x17: mv = ssp->RAM1[2]++; break;
911 // mod=3 (11)
912 case 0x1b: mv = ssp->RAM0[3]++; break;
913 case 0x1f: mv = ssp->RAM1[3]++; break;
30752975 914 default: elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: invalid mod in ((rX))? @ %04x", GET_PPC_OFFS());
5de27868 915 return 0;
916 }
917
918 return ((unsigned short *)svp->iram_rom)[mv];
919}
920
921
922// -----------------------------------------------------
923
71bb1b7b 924#if defined(USE_DEBUGGER)
726bbb3e 925static void debug_dump2file(const char *fname, void *mem, int len)
926{
927 FILE *f = fopen(fname, "wb");
928 unsigned short *p = mem;
929 int i;
930 if (f) {
931 for (i = 0; i < len/2; i++) p[i] = (p[i]<<8) | (p[i]>>8);
932 fwrite(mem, 1, len, f);
933 fclose(f);
934 for (i = 0; i < len/2; i++) p[i] = (p[i]<<8) | (p[i]>>8);
935 printf("dumped to %s\n", fname);
936 }
937 else
938 printf("dump failed\n");
939}
940#endif
941
3554b0a4 942#ifdef USE_DEBUGGER
5de27868 943static void debug_dump(void)
f8ef8ff7 944{
5de27868 945 printf("GR0: %04x X: %04x Y: %04x A: %08x\n", ssp->gr[SSP_GR0].h, rX, rY, ssp->gr[SSP_A].v);
6b6a3e50 946 printf("PC: %04x (%04x) P: %08x\n", GET_PC(), GET_PC() << 1, rP.v);
5de27868 947 printf("PM0: %04x PM1: %04x PM2: %04x\n", rPM0, rPM1, rPM2);
6b6a3e50 948 printf("XST: %04x PM4: %04x PMC: %08x\n", rXST, rPM4, rPMC.v);
d26dc685 949 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',
950 rST&SSP_FLAG_Z?'Z':'z', rST&SSP_FLAG_L?'L':'l', (rST>>5)&1, (rST>>6)&1);
5de27868 951 printf("STACK: %i %04x %04x %04x %04x %04x %04x\n", rSTACK, ssp->stack[0], ssp->stack[1],
952 ssp->stack[2], ssp->stack[3], ssp->stack[4], ssp->stack[5]);
953 printf("r0-r2: %02x %02x %02x r4-r6: %02x %02x %02x\n", rIJ[0], rIJ[1], rIJ[2], rIJ[4], rIJ[5], rIJ[6]);
954 elprintf(EL_SVP, "cycles: %i, emu_status: %x", g_cycles, ssp->emu_status);
955}
f8ef8ff7 956
5de27868 957static void debug_dump_mem(void)
958{
959 int h, i;
960 printf("RAM0\n");
961 for (h = 0; h < 32; h++)
962 {
963 if (h == 16) printf("RAM1\n");
964 printf("%03x:", h*16);
965 for (i = 0; i < 16; i++)
966 printf(" %04x", ssp->RAM[h*16+i]);
967 printf("\n");
968 }
969}
970
971static int bpts[10] = { 0, };
972
973static void debug(unsigned int pc, unsigned int op)
974{
975 static char buffo[64] = {0,};
976 char buff[64] = {0,};
977 int i;
978
979 if (running) {
980 for (i = 0; i < 10; i++)
981 if (pc != 0 && bpts[i] == pc) {
982 printf("breakpoint %i\n", i);
983 running = 0;
984 break;
985 }
986 }
987 if (running) return;
988
989 printf("%04x (%02x) @ %04x\n", op, op >> 9, pc<<1);
990
991 while (1)
992 {
993 printf("dbg> ");
994 fflush(stdout);
995 fgets(buff, sizeof(buff), stdin);
996 if (buff[0] == '\n') strcpy(buff, buffo);
997 else strcpy(buffo, buff);
998
999 switch (buff[0]) {
1000 case 0: exit(0);
1001 case 'c':
1002 case 'r': running = 1; return;
1003 case 's':
1004 case 'n': return;
1005 case 'x': debug_dump(); break;
1006 case 'm': debug_dump_mem(); break;
1007 case 'b': {
1008 char *baddr = buff + 2;
1009 i = 0;
1010 if (buff[3] == ' ') { i = buff[2] - '0'; baddr = buff + 4; }
1011 bpts[i] = strtol(baddr, NULL, 16) >> 1;
1012 printf("breakpoint %i set @ %04x\n", i, bpts[i]<<1);
1013 break;
1014 }
30752975 1015 case 'd':
1016 sprintf(buff, "iramrom_%04x.bin", last_iram);
1017 debug_dump2file(buff, svp->iram_rom, sizeof(svp->iram_rom));
1018 debug_dump2file("dram.bin", svp->dram, sizeof(svp->dram));
5de27868 1019 break;
5de27868 1020 default: printf("unknown command\n"); break;
1021 }
1022 }
1023}
3554b0a4 1024#endif // USE_DEBUGGER
1025
5de27868 1026
6b6a3e50 1027void ssp1601_reset(ssp1601_t *l_ssp)
1028{
1029 ssp = l_ssp;
1030 ssp->emu_status = 0;
1031 ssp->gr[SSP_GR0].v = 0xffff0000;
1032 rPC = 0x400;
1033 rSTACK = 0; // ? using ascending stack
1034 rST = 0;
1035}
1036
1037
5de27868 1038void ssp1601_run(int cycles)
1039{
017512f2 1040 SET_PC(rPC);
71bb1b7b 1041
017512f2 1042 g_cycles = cycles;
f8ef8ff7 1043
d26dc685 1044 while (g_cycles > 0 && !(ssp->emu_status & SSP_WAIT_MASK))
f8ef8ff7 1045 {
5de27868 1046 int op;
1047 u32 tmpv;
1048
1049 op = *PC++;
3554b0a4 1050#ifdef USE_DEBUGGER
5de27868 1051 debug(GET_PC()-1, op);
3554b0a4 1052#endif
f8ef8ff7 1053 switch (op >> 9)
1054 {
1055 // ld d, s
5de27868 1056 case 0x00:
e477f8f7 1057 CHECK_B_SET();
f8ef8ff7 1058 if (op == 0) break; // nop
017512f2 1059 if (op == ((SSP_A<<4)|SSP_P)) { // A <- P
017512f2 1060 read_P(); // update P
6b6a3e50 1061 rA32 = rP.v;
f8ef8ff7 1062 }
5de27868 1063 else
f8ef8ff7 1064 {
5de27868 1065 tmpv = REG_READ(op & 0x0f);
1066 REG_WRITE((op & 0xf0) >> 4, tmpv);
1067 }
1068 break;
1069
1070 // ld d, (ri)
1071 case 0x01: tmpv = ptr1_read(op); REG_WRITE((op & 0xf0) >> 4, tmpv); break;
1072
1073 // ld (ri), s
1074 case 0x02: tmpv = REG_READ((op & 0xf0) >> 4); ptr1_write(op, tmpv); break;
1075
1076 // ldi d, imm
e477f8f7 1077 case 0x04: CHECK_10f(); tmpv = *PC++; REG_WRITE((op & 0xf0) >> 4, tmpv); g_cycles--; break;
5de27868 1078
1079 // ld d, ((ri))
e477f8f7 1080 case 0x05: CHECK_MOD(); tmpv = ptr2_read(op); REG_WRITE((op & 0xf0) >> 4, tmpv); g_cycles -= 2; break;
5de27868 1081
1082 // ldi (ri), imm
e477f8f7 1083 case 0x06: tmpv = *PC++; ptr1_write(op, tmpv); g_cycles--; break;
5de27868 1084
1085 // ld adr, a
1086 case 0x07: ssp->RAM[op & 0x1ff] = rA; break;
1087
1088 // ld d, ri
e477f8f7 1089 case 0x09: CHECK_MOD(); tmpv = rIJ[(op&3)|((op>>6)&4)]; REG_WRITE((op & 0xf0) >> 4, tmpv); break;
5de27868 1090
1091 // ld ri, s
e477f8f7 1092 case 0x0a: CHECK_MOD(); rIJ[(op&3)|((op>>6)&4)] = REG_READ((op & 0xf0) >> 4); break;
5de27868 1093
1094 // ldi ri, simm
1095 case 0x0c:
1096 case 0x0d:
1097 case 0x0e:
1098 case 0x0f: rIJ[(op>>8)&7] = op; break;
1099
1100 // call cond, addr
1101 case 0x24: {
1102 int cond = 0;
e477f8f7 1103 CHECK_00f();
5de27868 1104 COND_CHECK
e477f8f7 1105 if (cond) { int new_PC = *PC++; write_STACK(GET_PC()); SET_PC(new_PC); }
5de27868 1106 else PC++;
e477f8f7 1107 g_cycles--; // always 2 cycles
5de27868 1108 break;
1109 }
1110
1111 // ld d, (a)
e477f8f7 1112 case 0x25:
1113 CHECK_10f();
1114 tmpv = ((unsigned short *)svp->iram_rom)[rA];
1115 REG_WRITE((op & 0xf0) >> 4, tmpv);
1116 g_cycles -= 2; // 3 cycles total
1117 break;
5de27868 1118
1119 // bra cond, addr
1120 case 0x26: {
1121 int cond = 0;
e477f8f7 1122 CHECK_00f();
5de27868 1123 COND_CHECK
e477f8f7 1124 if (cond) { int new_PC = *PC++; SET_PC(new_PC); }
5de27868 1125 else PC++;
e477f8f7 1126 g_cycles--;
5de27868 1127 break;
1128 }
1129
1130 // mod cond, op
1131 case 0x48: {
1132 int cond = 0;
e477f8f7 1133 CHECK_008();
5de27868 1134 COND_CHECK
1135 if (cond) {
1136 switch (op & 7) {
d26dc685 1137 case 2: rA32 = (signed int)rA32 >> 1; break; // shr (arithmetic)
5de27868 1138 case 3: rA32 <<= 1; break; // shl
d26dc685 1139 case 6: rA32 = -(signed int)rA32; break; // neg
1140 case 7: if ((int)rA32 < 0) rA32 = -(signed int)rA32; break; // abs
689fb2c0 1141 default: elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: unhandled mod %i @ %04x",
1142 op&7, GET_PPC_OFFS());
5de27868 1143 }
e477f8f7 1144 UPD_ACC_ZN
f8ef8ff7 1145 }
1146 break;
5de27868 1147 }
1148
689fb2c0 1149 // mpys?
30752975 1150 case 0x1b:
e477f8f7 1151 CHECK_B_CLEAR();
30752975 1152 read_P(); // update P
e477f8f7 1153 rA32 -= rP.v;
1154 UPD_ACC_ZN
1155 rX = ptr1_read_(op&3, 0, (op<<1)&0x18);
1156 rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18);
3554b0a4 1157 break;
1158
5de27868 1159 // mpya (rj), (ri), b
1160 case 0x4b:
e477f8f7 1161 CHECK_B_CLEAR();
5de27868 1162 read_P(); // update P
e477f8f7 1163 rA32 += rP.v;
1164 UPD_ACC_ZN
1165 rX = ptr1_read_(op&3, 0, (op<<1)&0x18);
1166 rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18);
5de27868 1167 break;
1168
1169 // mld (rj), (ri), b
1170 case 0x5b:
e477f8f7 1171 CHECK_B_CLEAR();
3554b0a4 1172 rA32 = 0;
e477f8f7 1173 rST &= 0x0fff;
1174 rST |= SSP_FLAG_Z;
1175 rX = ptr1_read_(op&3, 0, (op<<1)&0x18);
1176 rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18);
5de27868 1177 break;
1178
1179 // OP a, s
e477f8f7 1180 case 0x10: CHECK_1f0(); OP_CHECK32(OP_SUBA32); tmpv = REG_READ(op & 0x0f); OP_SUBA(tmpv); break;
1181 case 0x30: CHECK_1f0(); OP_CHECK32(OP_CMPA32); tmpv = REG_READ(op & 0x0f); OP_CMPA(tmpv); break;
1182 case 0x40: CHECK_1f0(); OP_CHECK32(OP_ADDA32); tmpv = REG_READ(op & 0x0f); OP_ADDA(tmpv); break;
1183 case 0x50: CHECK_1f0(); OP_CHECK32(OP_ANDA32); tmpv = REG_READ(op & 0x0f); OP_ANDA(tmpv); break;
1184 case 0x60: CHECK_1f0(); OP_CHECK32(OP_ORA32 ); tmpv = REG_READ(op & 0x0f); OP_ORA (tmpv); break;
1185 case 0x70: CHECK_1f0(); OP_CHECK32(OP_EORA32); tmpv = REG_READ(op & 0x0f); OP_EORA(tmpv); break;
5de27868 1186
1187 // OP a, (ri)
e477f8f7 1188 case 0x11: CHECK_0f0(); tmpv = ptr1_read(op); OP_SUBA(tmpv); break;
1189 case 0x31: CHECK_0f0(); tmpv = ptr1_read(op); OP_CMPA(tmpv); break;
1190 case 0x41: CHECK_0f0(); tmpv = ptr1_read(op); OP_ADDA(tmpv); break;
1191 case 0x51: CHECK_0f0(); tmpv = ptr1_read(op); OP_ANDA(tmpv); break;
1192 case 0x61: CHECK_0f0(); tmpv = ptr1_read(op); OP_ORA (tmpv); break;
1193 case 0x71: CHECK_0f0(); tmpv = ptr1_read(op); OP_EORA(tmpv); break;
5de27868 1194
1195 // OP a, adr
1196 case 0x03: tmpv = ssp->RAM[op & 0x1ff]; OP_LDA (tmpv); break;
1197 case 0x13: tmpv = ssp->RAM[op & 0x1ff]; OP_SUBA(tmpv); break;
1198 case 0x33: tmpv = ssp->RAM[op & 0x1ff]; OP_CMPA(tmpv); break;
1199 case 0x43: tmpv = ssp->RAM[op & 0x1ff]; OP_ADDA(tmpv); break;
1200 case 0x53: tmpv = ssp->RAM[op & 0x1ff]; OP_ANDA(tmpv); break;
1201 case 0x63: tmpv = ssp->RAM[op & 0x1ff]; OP_ORA (tmpv); break;
1202 case 0x73: tmpv = ssp->RAM[op & 0x1ff]; OP_EORA(tmpv); break;
1203
1204 // OP a, imm
e477f8f7 1205 case 0x14: CHECK_IMM16(); tmpv = *PC++; OP_SUBA(tmpv); g_cycles--; break;
1206 case 0x34: CHECK_IMM16(); tmpv = *PC++; OP_CMPA(tmpv); g_cycles--; break;
1207 case 0x44: CHECK_IMM16(); tmpv = *PC++; OP_ADDA(tmpv); g_cycles--; break;
1208 case 0x54: CHECK_IMM16(); tmpv = *PC++; OP_ANDA(tmpv); g_cycles--; break;
1209 case 0x64: CHECK_IMM16(); tmpv = *PC++; OP_ORA (tmpv); g_cycles--; break;
1210 case 0x74: CHECK_IMM16(); tmpv = *PC++; OP_EORA(tmpv); g_cycles--; break;
5de27868 1211
1212 // OP a, ((ri))
e477f8f7 1213 case 0x15: CHECK_MOD(); tmpv = ptr2_read(op); OP_SUBA(tmpv); g_cycles -= 2; break;
1214 case 0x35: CHECK_MOD(); tmpv = ptr2_read(op); OP_CMPA(tmpv); g_cycles -= 2; break;
1215 case 0x45: CHECK_MOD(); tmpv = ptr2_read(op); OP_ADDA(tmpv); g_cycles -= 2; break;
1216 case 0x55: CHECK_MOD(); tmpv = ptr2_read(op); OP_ANDA(tmpv); g_cycles -= 2; break;
1217 case 0x65: CHECK_MOD(); tmpv = ptr2_read(op); OP_ORA (tmpv); g_cycles -= 2; break;
1218 case 0x75: CHECK_MOD(); tmpv = ptr2_read(op); OP_EORA(tmpv); g_cycles -= 2; break;
5de27868 1219
1220 // OP a, ri
e477f8f7 1221 case 0x19: CHECK_MOD(); tmpv = rIJ[IJind]; OP_SUBA(tmpv); break;
1222 case 0x39: CHECK_MOD(); tmpv = rIJ[IJind]; OP_CMPA(tmpv); break;
1223 case 0x49: CHECK_MOD(); tmpv = rIJ[IJind]; OP_ADDA(tmpv); break;
1224 case 0x59: CHECK_MOD(); tmpv = rIJ[IJind]; OP_ANDA(tmpv); break;
1225 case 0x69: CHECK_MOD(); tmpv = rIJ[IJind]; OP_ORA (tmpv); break;
1226 case 0x79: CHECK_MOD(); tmpv = rIJ[IJind]; OP_EORA(tmpv); break;
5de27868 1227
1228 // OP simm
e477f8f7 1229 case 0x1c: CHECK_B_SET(); OP_SUBA(op & 0xff); break;
1230 case 0x3c: CHECK_B_SET(); OP_CMPA(op & 0xff); break;
1231 case 0x4c: CHECK_B_SET(); OP_ADDA(op & 0xff); break;
1232 case 0x5c: CHECK_B_SET(); OP_ANDA(op & 0xff); break;
1233 case 0x6c: CHECK_B_SET(); OP_ORA (op & 0xff); break;
1234 case 0x7c: CHECK_B_SET(); OP_EORA(op & 0xff); break;
f8ef8ff7 1235
1236 default:
3554b0a4 1237 elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME unhandled op %04x @ %04x", op, GET_PPC_OFFS());
017512f2 1238 break;
f8ef8ff7 1239 }
017512f2 1240 g_cycles--;
f8ef8ff7 1241 }
1242
1243 rPC = GET_PC();
726bbb3e 1244 read_P(); // update P
f8ef8ff7 1245}
1246
fast MegaDrive/MegaCD/32X emulator