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1 | // basic, incomplete SSP160x (SSP1601?) interpreter |
2 | |
3 | /* |
4 | * Register info |
5 | * most names taken from MAME code |
6 | * |
7 | * 0. "-" |
8 | * size: 16 |
9 | * desc: Constant register with all bits set (0xffff). |
10 | * |
11 | * 1. "X" |
12 | * size: 16 |
13 | * desc: Generic register. When set, updates P (P = X * Y * 2) ?? |
14 | * |
15 | * 2. "Y" |
16 | * size: 16 |
17 | * desc: Generic register. When set, updates P (P = X * Y * 2) ?? |
18 | * |
19 | * 3. "A" |
20 | * size: 32 |
21 | * desc: Accumulator. |
22 | * |
23 | * 4. "ST" |
24 | * size: 16 |
25 | * desc: Status register. From MAME: bits 0-9 are CONTROL, other FLAG |
26 | * fedc ba98 7654 3210 |
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27 | * 210 - RPL (?) "Loop size". If non-zero, makes (rX+) and (rX-) respectively |
28 | * modulo-increment and modulo-decrement. The value shows which |
29 | * power of 2 to use, i.e. 4 means modulo by 16. |
30 | * (e: fir16_32.sc, IIR_4B.SC, DECIM.SC) |
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31 | * 43 - RB (?) |
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32 | * 5 - GP0_0 (ST5?) Changed before acessing PM0 (affects banking?). |
33 | * 6 - GP0_1 (ST6?) Cleared before acessing PM0 (affects banking?). Set after. |
34 | * datasheet says these (5,6) bits correspond to hardware pins. |
35 | * 7 - IE (?) Not directly used by SVP code (never set, but preserved)? |
36 | * 8 - OP (?) Not used by SVP code (only cleared)? (MAME: saturated value |
37 | * (probably means clamping? i.e. 0x7ffc + 9 -> 0x7fff)) |
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38 | * 9 - MACS (?) Not used by SVP code (only cleared)? (e: "mac shift") |
39 | * a - GPI_0 Interrupt 0 enable/status? |
40 | * b - GPI_1 Interrupt 1 enable/status? |
41 | * c - L L flag. Carry? |
42 | * d - Z Zero flag. |
43 | * e - OV Overflow flag. |
44 | * f - N Negative flag. |
45 | * seen directly changing code sequences: |
46 | * ldi ST, 0 ld A, ST ld A, ST ld A, ST ldi st, 20h |
47 | * ldi ST, 60h ori A, 60h and A, E8h and A, E8h |
48 | * ld ST, A ld ST, A ori 3 |
49 | * ld ST, A |
50 | * |
51 | * 5. "STACK" |
52 | * size: 16 |
53 | * desc: hw stack of 6 levels (according to datasheet) |
54 | * |
55 | * 6. "PC" |
56 | * size: 16 |
57 | * desc: Program counter. |
58 | * |
59 | * 7. "P" |
60 | * size: 32 |
61 | * desc: multiply result register. Updated after mp* instructions, |
62 | * or writes to X or Y (P = X * Y * 2) ?? |
63 | * probably affected by MACS bit in ST. |
64 | * |
65 | * 8. "PM0" (PM from PMAR name from Tasco's docs) |
66 | * size: 16? |
67 | * desc: Programmable Memory access register. |
68 | * On reset, or when one (both?) GP0 bits are clear, |
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69 | * acts as status for XST, mapped at 015004 at 68k side: |
70 | * bit0: ssp has written something to XST (cleared when 015004 is read) |
71 | * bit1: 68k has written something through a1500{0|2} (cleared on PM0 read) |
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72 | * |
73 | * 9. "PM1" |
74 | * size: 16? |
75 | * desc: Programmable Memory access register. |
76 | * This reg. is only used as PMAR. |
77 | * |
78 | * 10. "PM2" |
79 | * size: 16? |
80 | * desc: Programmable Memory access register. |
81 | * This reg. is only used as PMAR. |
82 | * |
83 | * 11. "XST" |
84 | * size: 16? |
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85 | * desc: eXternal STate. Mapped to a15000 and a15002 at 68k side. |
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86 | * Can be programmed as PMAR? (only seen in test mode code) |
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87 | * Affects PM0 when written to? |
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88 | * |
89 | * 12. "PM4" |
90 | * size: 16? |
91 | * desc: Programmable Memory access register. |
92 | * This reg. is only used as PMAR. The most used PMAR by VR. |
93 | * |
94 | * 13. (unused by VR) |
95 | * |
96 | * 14. "PMC" (PMC from PMAC name from Tasco's docs) |
97 | * size: 32? |
98 | * desc: Programmable Memory access Control. Set using 2 16bit writes, |
99 | * first address, then mode word. After setting PMAC, PMAR sould |
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100 | * be blind accessed (ld -, PMx or ld PMx, -) to program it for |
101 | * reading and writing respectively. |
102 | * Reading the register also shifts it's state (from "waiting for |
103 | * address" to "waiting for mode" and back). Reads always return |
104 | * address related to last PMx register accressed. |
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105 | * |
106 | * 15. "AL" |
107 | * size: 16 |
108 | * desc: Accumulator Low. 16 least significant bits of accumulator (not 100% sure) |
109 | * (normally reading acc (ld X, A) you get 16 most significant bits). |
110 | * |
111 | * |
112 | * There are 8 8-bit pointer registers rX. r0-r3 (ri) point to RAM0, r4-r7 (rj) point to RAM1. |
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113 | * They can be accessed directly, or 2 indirection levels can be used [ (rX), ((rX)) ], |
114 | * which work similar to * and ** operators in C, only they use different memory banks and |
115 | * ((rX)) also does post-increment. First indirection level (rX) accesses RAMx, second accesses |
116 | * program memory at address read from (rX), and increments value in (rX). |
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117 | * |
118 | * r0,r1,r2,r4,r5,r6 can be modified [ex: ldi r0, 5]. |
119 | * 3 modifiers can be applied (optional): |
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120 | * + : post-increment [ex: ld a, (r0+) ]. Can be made modulo-increment by setting RPL bits in ST. |
121 | * - : post-decrement. Can be made modulo-decrement by setting RPL bits in ST (not sure). |
122 | * +!: post-increment, unaffected by RPL (probably). |
123 | * These are only used on 1st indirection level, so things like [ld a, ((r0+))] and [ld X, r6-] |
124 | * ar probably invalid. |
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125 | * |
126 | * r3 and r7 are special and can not be changed (at least Samsung samples and SVP code never do). |
127 | * They are fixed to the start of their RAM banks. (They are probably changeable for ssp1605+, |
128 | * Samsung's old DSP page claims that). |
129 | * 1 of these 4 modifiers must be used (short form direct addressing?): |
130 | * |00: RAMx[0] [ex: (r3|00), 0] (based on sample code) |
131 | * |01: RAMx[1] |
132 | * |10: RAMx[2] ? maybe 10h? accortding to Div_c_dp.sc, 2 |
133 | * |11: RAMx[3] |
134 | * |
135 | * |
136 | * Instruction notes |
137 | * |
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138 | * ld a, * doesn't affect flags! (e: A_LAW.SC, Div_c_dp.sc) |
139 | * |
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140 | * mld (rj), (ri) [, b] |
141 | * operation: A = 0; P = (rj) * (ri) |
142 | * notes: based on IIR_4B.SC sample. flags? what is b??? |
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143 | * |
144 | * mpya (rj), (ri) [, b] |
145 | * name: multiply and add? |
146 | * operation: A += P; P = (rj) * (ri) |
147 | * |
148 | * mpys (rj), (ri), b |
149 | * name: multiply and subtract? |
150 | * notes: not used by VR code. |
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151 | * |
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152 | * mod cond, op |
153 | * mod cond, shr does arithmetic shift |
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154 | * |
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155 | * 'ld -, AL' and probably 'ld AL, -' are for dummy assigns |
156 | * |
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157 | * memory map: |
158 | * 000000 - 1fffff ROM, accessable by both |
159 | * 200000 - 2fffff unused? |
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160 | * 300000 - 31ffff DRAM, both |
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161 | * 320000 - 38ffff unused? |
162 | * 390000 - 3907ff IRAM. can only be accessed by ssp? |
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163 | * 390000 - 39ffff similar mapping to "cell arrange" in Sega CD, 68k only? |
164 | * 3a0000 - 3affff similar mapping to "cell arrange" in Sega CD, a bit different |
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165 | * |
166 | * 30fe02 - 0 if SVP busy, 1 if done (set by SVP, checked and cleared by 68k) |
167 | * 30fe06 - also sync related. |
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168 | * 30fe08 - job number [1-12] for SVP. 0 means no job. Set by 68k, read-cleared by SVP. |
169 | * |
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170 | * TODO: |
171 | * + figure out if 'op A, P' is 32bit (nearly sure it is) |
172 | * * what exactly is AL? |
173 | * * does mld, mpya load their operands into X and Y? |
174 | * * OP simm |
175 | * |
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176 | * misc: |
177 | * pressing all buttons while resetting game will kick into test mode |
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178 | * |
179 | * Assumptions in this code |
180 | * P is not directly writeable |
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181 | * flags correspond to full 32bit accumulator |
182 | * only Z and N status flags are emulated (others unused by SVP) |
183 | * modifiers for 'OP a, ri' are ignored (invalid?/not used by SVP) |
184 | * modifiers '+' and '+!' act the same (this is most likely wrong) |
185 | * 'ld d, (a)' loads from program ROM |
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186 | */ |
187 | |
188 | #include "../../PicoInt.h" |
189 | |
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190 | #define u32 unsigned int |
191 | |
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192 | //#define USE_DEBUGGER |
193 | |
017512f2 |
194 | // 0 |
195 | #define rX ssp->gr[SSP_X].h |
196 | #define rY ssp->gr[SSP_Y].h |
197 | #define rA ssp->gr[SSP_A].h |
198 | #define rST ssp->gr[SSP_ST].h // 4 |
199 | #define rSTACK ssp->gr[SSP_STACK].h |
200 | #define rPC ssp->gr[SSP_PC].h |
201 | #define rP ssp->gr[SSP_P] |
202 | #define rPM0 ssp->gr[SSP_PM0].h // 8 |
203 | #define rPM1 ssp->gr[SSP_PM1].h |
204 | #define rPM2 ssp->gr[SSP_PM2].h |
205 | #define rXST ssp->gr[SSP_XST].h |
206 | #define rPM4 ssp->gr[SSP_PM4].h // 12 |
207 | // 13 |
208 | #define rPMC ssp->gr[SSP_PMC] // will keep addr in .h, mode in .l |
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209 | #define rAL ssp->gr[SSP_A].l |
210 | |
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211 | #define rA32 ssp->gr[SSP_A].v |
212 | #define rIJ ssp->r |
213 | |
214 | #define IJind (((op>>6)&4)|(op&3)) |
215 | |
216 | #define GET_PC() (PC - (unsigned short *)svp->iram_rom) |
217 | #define GET_PPC_OFFS() ((unsigned int)PC - (unsigned int)svp->iram_rom - 2) |
218 | #define SET_PC(d) PC = (unsigned short *)svp->iram_rom + d |
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219 | |
220 | #define REG_READ(r) (((r) <= 4) ? ssp->gr[r].h : read_handlers[r]()) |
221 | #define REG_WRITE(r,d) { \ |
222 | int r1 = r; \ |
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223 | if (r1 >= 4) write_handlers[r1](d); \ |
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224 | else if (r1 > 0) ssp->gr[r1].h = d; \ |
225 | } |
226 | |
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227 | // flags |
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228 | #define SSP_FLAG_L (1<<0xc) |
229 | #define SSP_FLAG_Z (1<<0xd) |
230 | #define SSP_FLAG_V (1<<0xe) |
231 | #define SSP_FLAG_N (1<<0xf) |
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232 | |
233 | // update ZN according to 32bit ACC. |
234 | #define UPD_ACC_ZN \ |
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235 | rST &= ~(SSP_FLAG_Z|SSP_FLAG_N); \ |
236 | if (!rA32) rST |= SSP_FLAG_Z; \ |
237 | else rST |= (rA32>>16)&SSP_FLAG_N; |
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238 | |
239 | // it seems SVP code never checks for L and OV, so we leave them out. |
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240 | // rST |= (t>>4)&SSP_FLAG_L; |
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241 | #define UPD_LZVN \ |
242 | rST &= ~(SSP_FLAG_L|SSP_FLAG_Z|SSP_FLAG_V|SSP_FLAG_N); \ |
243 | if (!rA32) rST |= SSP_FLAG_Z; \ |
244 | else rST |= (rA32>>16)&SSP_FLAG_N; |
245 | |
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246 | // standard cond processing. |
247 | // again, only Z and N is checked, as SVP doesn't seem to use any other conds. |
248 | #define COND_CHECK \ |
249 | switch (op&0xf0) { \ |
250 | case 0x00: cond = 1; break; /* always true */ \ |
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251 | case 0x50: cond = !((rST ^ (op<<5)) & SSP_FLAG_Z); break; /* Z matches f(?) bit */ \ |
252 | case 0x70: cond = !((rST ^ (op<<7)) & SSP_FLAG_N); break; /* N matches f(?) bit */ \ |
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253 | default:elprintf(EL_SVP, "ssp FIXME: unimplemented cond @ %04x", GET_PPC_OFFS()); break; \ |
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254 | } |
255 | |
256 | // ops with accumulator. |
257 | // how is low word really affected by these? |
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258 | // nearly sure 'ld A' doesn't affect flags |
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259 | #define OP_LDA(x) \ |
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260 | ssp->gr[SSP_A].h = x |
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261 | |
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262 | #define OP_LDA32(x) \ |
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263 | rA32 = x |
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264 | |
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265 | #define OP_SUBA(x) { \ |
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266 | rA32 -= (x) << 16; \ |
267 | UPD_LZVN \ |
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268 | } |
269 | |
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270 | #define OP_SUBA32(x) { \ |
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271 | rA32 -= (x); \ |
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272 | UPD_LZVN \ |
273 | } |
274 | |
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275 | #define OP_CMPA(x) { \ |
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276 | u32 t = rA32 - ((x) << 16); \ |
277 | rST &= ~(SSP_FLAG_L|SSP_FLAG_Z|SSP_FLAG_V|SSP_FLAG_N); \ |
278 | if (!t) rST |= SSP_FLAG_Z; \ |
279 | else rST |= (t>>16)&SSP_FLAG_N; \ |
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280 | } |
281 | |
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282 | #define OP_CMPA32(x) { \ |
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283 | u32 t = rA32 - (x); \ |
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284 | rST &= ~(SSP_FLAG_L|SSP_FLAG_Z|SSP_FLAG_V|SSP_FLAG_N); \ |
285 | if (!t) rST |= SSP_FLAG_Z; \ |
286 | else rST |= (t>>16)&SSP_FLAG_N; \ |
287 | } |
288 | |
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289 | #define OP_ADDA(x) { \ |
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290 | rA32 += (x) << 16; \ |
291 | UPD_LZVN \ |
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292 | } |
293 | |
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294 | #define OP_ADDA32(x) { \ |
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295 | rA32 += (x); \ |
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296 | UPD_LZVN \ |
297 | } |
298 | |
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299 | #define OP_ANDA(x) \ |
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300 | rA32 &= (x) << 16; \ |
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301 | UPD_ACC_ZN |
302 | |
67256d4b |
303 | #define OP_ANDA32(x) \ |
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304 | rA32 &= (x); \ |
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305 | UPD_ACC_ZN |
306 | |
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307 | #define OP_ORA(x) \ |
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308 | rA32 |= (x) << 16; \ |
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309 | UPD_ACC_ZN |
310 | |
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311 | #define OP_ORA32(x) \ |
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312 | rA32 |= (x); \ |
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313 | UPD_ACC_ZN |
314 | |
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315 | #define OP_EORA(x) \ |
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316 | rA32 ^= (x) << 16; \ |
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317 | UPD_ACC_ZN |
318 | |
67256d4b |
319 | #define OP_EORA32(x) \ |
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320 | rA32 ^= (x); \ |
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321 | UPD_ACC_ZN |
322 | |
323 | |
324 | #define OP_CHECK32(OP) \ |
325 | if ((op & 0x0f) == SSP_P) { /* A <- P */ \ |
326 | read_P(); /* update P */ \ |
327 | OP(ssp->gr[SSP_P].v); \ |
328 | break; \ |
329 | } |
330 | |
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331 | |
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332 | static ssp1601_t *ssp = NULL; |
333 | static unsigned short *PC; |
334 | static int g_cycles; |
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335 | |
336 | #ifdef USE_DEBUGGER |
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337 | static int running = 0; |
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338 | static int last_iram = 0; |
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339 | #endif |
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340 | |
341 | // ----------------------------------------------------- |
342 | // register i/o handlers |
343 | |
344 | // 0-4, 13 |
345 | static u32 read_unknown(void) |
346 | { |
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347 | elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: unknown read @ %04x", GET_PPC_OFFS()); |
017512f2 |
348 | return 0; |
349 | } |
350 | |
351 | static void write_unknown(u32 d) |
352 | { |
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353 | elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: unknown write @ %04x", GET_PPC_OFFS()); |
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354 | } |
355 | |
356 | // 4 |
357 | static void write_ST(u32 d) |
358 | { |
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359 | //if ((rST ^ d) & 0x0007) elprintf(EL_SVP, "ssp RPL %i -> %i @ %04x", rST&7, d&7, GET_PPC_OFFS()); |
360 | if ((rST ^ d) & 0x0f98) elprintf(EL_SVP, "ssp FIXME ST %04x -> %04x @ %04x", rST, d, GET_PPC_OFFS()); |
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361 | rST = d; |
017512f2 |
362 | } |
363 | |
364 | // 5 |
365 | static u32 read_STACK(void) |
366 | { |
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367 | --rSTACK; |
368 | if ((short)rSTACK < 0) { |
369 | rSTACK = 5; |
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370 | elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: stack underflow! (%i) @ %04x", rSTACK, GET_PPC_OFFS()); |
5de27868 |
371 | } |
372 | return ssp->stack[rSTACK]; |
017512f2 |
373 | } |
374 | |
375 | static void write_STACK(u32 d) |
376 | { |
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377 | if (rSTACK >= 6) { |
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378 | elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: stack overflow! (%i) @ %04x", rSTACK, GET_PPC_OFFS()); |
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379 | rSTACK = 0; |
380 | } |
381 | ssp->stack[rSTACK++] = d; |
017512f2 |
382 | } |
383 | |
384 | // 6 |
385 | static u32 read_PC(void) |
386 | { |
387 | return GET_PC(); |
388 | } |
389 | |
390 | static void write_PC(u32 d) |
391 | { |
392 | SET_PC(d); |
393 | g_cycles--; |
394 | } |
395 | |
396 | // 7 |
397 | static u32 read_P(void) |
398 | { |
4fd5325d |
399 | int m1 = (signed short)rX; |
400 | int m2 = (signed short)rY; |
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401 | rP.v = (m1 * m2 * 2); |
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402 | return rP.h; |
403 | } |
404 | |
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405 | // ----------------------------------------------------- |
406 | |
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407 | static int get_inc(int mode) |
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408 | { |
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409 | int inc = (mode >> 11) & 7; |
410 | if (inc != 0) { |
411 | if (inc != 7) inc--; |
412 | inc = (1<<16) << inc; // 0 1 2 4 8 16 32 128 |
413 | if (mode & 0x8000) inc = -inc; // decrement mode |
414 | } |
415 | return inc; |
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416 | } |
417 | |
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418 | #define overwite_write(dst, d) \ |
419 | { \ |
420 | if (d & 0xf000) { dst &= ~0xf000; dst |= d & 0xf000; } \ |
421 | if (d & 0x0f00) { dst &= ~0x0f00; dst |= d & 0x0f00; } \ |
422 | if (d & 0x00f0) { dst &= ~0x00f0; dst |= d & 0x00f0; } \ |
423 | if (d & 0x000f) { dst &= ~0x000f; dst |= d & 0x000f; } \ |
424 | } |
425 | |
017512f2 |
426 | static u32 pm_io(int reg, int write, u32 d) |
427 | { |
67256d4b |
428 | if (ssp->emu_status & SSP_PMC_SET) |
429 | { |
430 | // this MUST be blind r or w |
431 | if ((*(PC-1) & 0xff0f) && (*(PC-1) & 0xfff0)) { |
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432 | elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: tried to set PM%i (%c) with non-blind i/o %08x @ %04x", |
67256d4b |
433 | reg, write ? 'w' : 'r', rPMC.v, GET_PPC_OFFS()); |
434 | ssp->emu_status &= ~SSP_PMC_SET; |
435 | return 0; |
436 | } |
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437 | elprintf(EL_SVP, "PM%i (%c) set to %08x @ %04x", reg, write ? 'w' : 'r', rPMC.v, GET_PPC_OFFS()); |
017512f2 |
438 | ssp->pmac_read[write ? reg + 6 : reg] = rPMC.v; |
439 | ssp->emu_status &= ~SSP_PMC_SET; |
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440 | if ((rPMC.v & 0x7f) == 0x1c && (rPMC.v & 0x7fff0000) == 0) { |
3554b0a4 |
441 | elprintf(EL_SVP, "ssp IRAM copy from %06x", (ssp->RAM1[0]-1)<<1); |
442 | #ifdef USE_DEBUGGER |
30752975 |
443 | last_iram = (ssp->RAM1[0]-1)<<1; |
3554b0a4 |
444 | #endif |
30752975 |
445 | } |
017512f2 |
446 | return 0; |
447 | } |
448 | |
5de27868 |
449 | // just in case |
67256d4b |
450 | if (ssp->emu_status & SSP_PMC_HAVE_ADDR) { |
3554b0a4 |
451 | elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i (%c) with only addr set @ %04x", |
67256d4b |
452 | reg, write ? 'w' : 'r', GET_PPC_OFFS()); |
453 | ssp->emu_status &= ~SSP_PMC_HAVE_ADDR; |
454 | } |
5de27868 |
455 | |
5de27868 |
456 | if (reg == 4 || (rST & 0x60)) |
457 | { |
30752975 |
458 | #define CADDR ((((mode<<16)&0x7f0000)|addr)<<1) |
d26dc685 |
459 | unsigned short *dram = (unsigned short *)svp->dram; |
5de27868 |
460 | if (write) |
461 | { |
462 | int mode = ssp->pmac_write[reg]&0xffff; |
463 | int addr = ssp->pmac_write[reg]>>16; |
3554b0a4 |
464 | if ((mode & 0xb800) == 0xb800) |
465 | elprintf(EL_SVP, "ssp FIXME: mode %04x", mode); |
466 | if ((mode & 0x43ff) == 0x0018) // DRAM |
467 | { |
468 | int inc = get_inc(mode); |
469 | elprintf(EL_SVP, "ssp PM%i DRAM w [%06x] %04x (inc %i, ovrw %i)", |
470 | reg, CADDR, d, inc >> 16, (mode>>10)&1); |
471 | if (mode & 0x0400) { |
472 | overwite_write(dram[addr], d); |
473 | } else dram[addr] = d; |
474 | ssp->pmac_write[reg] += inc; |
475 | } |
476 | else if ((mode & 0xfbff) == 0x4018) // DRAM, cell inc |
477 | { |
478 | elprintf(EL_SVP, "ssp PM%i DRAM w [%06x] %04x (cell inc, ovrw %i) @ %04x", |
479 | reg, CADDR, d, (mode>>10)&1, GET_PPC_OFFS()); |
480 | if (mode & 0x0400) { |
481 | overwite_write(dram[addr], d); |
482 | } else dram[addr] = d; |
483 | ssp->pmac_write[reg] += (addr&1) ? (31<<16) : (1<<16); |
484 | } |
485 | else if ((mode & 0x47ff) == 0x001c) // IRAM |
486 | { |
487 | int inc = get_inc(mode); |
488 | if ((addr&0xfc00) != 0x8000) |
489 | elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: invalid IRAM addr: %04x", addr<<1); |
490 | elprintf(EL_SVP, "ssp IRAM w [%06x] %04x (inc %i)", (addr<<1)&0x7ff, d, inc >> 16); |
491 | ((unsigned short *)svp->iram_rom)[addr&0x3ff] = d; |
492 | ssp->pmac_write[reg] += inc; |
493 | } |
494 | else |
495 | { |
496 | elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i unhandled write mode %04x, [%06x] %04x @ %04x", |
497 | reg, mode, CADDR, d, GET_PPC_OFFS()); |
5de27868 |
498 | } |
499 | } |
500 | else |
501 | { |
502 | int mode = ssp->pmac_read[reg]&0xffff; |
503 | int addr = ssp->pmac_read[reg]>>16; |
3554b0a4 |
504 | if ((mode & 0xfff0) == 0x0800) // ROM, inc 1, verified to be correct |
505 | { |
d26dc685 |
506 | elprintf(EL_SVP, "ssp ROM r [%06x] %04x", CADDR, |
507 | ((unsigned short *)Pico.rom)[addr|((mode&0xf)<<16)]); |
508 | ssp->pmac_read[reg] += 1<<16; |
509 | d = ((unsigned short *)Pico.rom)[addr|((mode&0xf)<<16)]; |
d26dc685 |
510 | } |
3554b0a4 |
511 | else if ((mode & 0x47ff) == 0x0018) // DRAM |
512 | { |
513 | int inc = get_inc(mode); |
514 | elprintf(EL_SVP, "ssp PM%i DRAM r [%06x] %04x (inc %i)", reg, CADDR, dram[addr], inc >> 16); |
515 | d = dram[addr]; |
516 | ssp->pmac_read[reg] += inc; |
517 | } |
518 | else |
519 | { |
520 | elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i unhandled read mode %04x, [%06x] @ %04x", |
521 | reg, mode, CADDR, GET_PPC_OFFS()); |
522 | d = 0; |
5de27868 |
523 | } |
524 | } |
30752975 |
525 | |
526 | // PMC value corresponds to last PMR accessed (not sure). |
527 | rPMC.v = ssp->pmac_read[write ? reg + 6 : reg]; |
528 | |
529 | return d; |
017512f2 |
530 | } |
531 | |
532 | return (u32)-1; |
533 | } |
534 | |
535 | // 8 |
536 | static u32 read_PM0(void) |
537 | { |
538 | u32 d = pm_io(0, 0, 0); |
539 | if (d != (u32)-1) return d; |
67256d4b |
540 | elprintf(EL_SVP, "PM0 raw r %04x @ %04x", rPM0, GET_PPC_OFFS()); |
d26dc685 |
541 | d = rPM0; |
542 | if (!(d & 2) && (GET_PPC_OFFS() == 0x800 || GET_PPC_OFFS() == 0x1851E)) { |
543 | ssp->emu_status |= SSP_WAIT_PM0; elprintf(EL_SVP, "det TIGHT loop: PM0"); |
544 | } |
545 | rPM0 &= ~2; // ? |
546 | return d; |
017512f2 |
547 | } |
548 | |
549 | static void write_PM0(u32 d) |
550 | { |
551 | u32 r = pm_io(0, 1, d); |
552 | if (r != (u32)-1) return; |
5de27868 |
553 | elprintf(EL_SVP, "PM0 raw w %04x @ %04x", d, GET_PPC_OFFS()); |
d26dc685 |
554 | rPM0 = d; |
017512f2 |
555 | } |
556 | |
557 | // 9 |
558 | static u32 read_PM1(void) |
559 | { |
560 | u32 d = pm_io(1, 0, 0); |
561 | if (d != (u32)-1) return d; |
562 | // can be removed? |
5de27868 |
563 | elprintf(EL_SVP, "PM1 raw r %04x @ %04x", rPM1, GET_PPC_OFFS()); |
564 | return rPM1; |
017512f2 |
565 | } |
566 | |
567 | static void write_PM1(u32 d) |
568 | { |
569 | u32 r = pm_io(1, 1, d); |
570 | if (r != (u32)-1) return; |
571 | // can be removed? |
5de27868 |
572 | elprintf(EL_SVP, "PM1 raw w %04x @ %04x", d, GET_PPC_OFFS()); |
573 | rPM1 = d; |
017512f2 |
574 | } |
575 | |
576 | // 10 |
577 | static u32 read_PM2(void) |
578 | { |
579 | u32 d = pm_io(2, 0, 0); |
580 | if (d != (u32)-1) return d; |
581 | // can be removed? |
5de27868 |
582 | elprintf(EL_SVP, "PM2 raw r %04x @ %04x", rPM2, GET_PPC_OFFS()); |
583 | return rPM2; |
017512f2 |
584 | } |
585 | |
586 | static void write_PM2(u32 d) |
587 | { |
588 | u32 r = pm_io(2, 1, d); |
589 | if (r != (u32)-1) return; |
590 | // can be removed? |
5de27868 |
591 | elprintf(EL_SVP, "PM2 raw w %04x @ %04x", d, GET_PPC_OFFS()); |
592 | rPM2 = d; |
017512f2 |
593 | } |
594 | |
595 | // 11 |
596 | static u32 read_XST(void) |
597 | { |
598 | // can be removed? |
599 | u32 d = pm_io(3, 0, 0); |
600 | if (d != (u32)-1) return d; |
601 | |
5de27868 |
602 | elprintf(EL_SVP, "XST raw r %04x @ %04x", rXST, GET_PPC_OFFS()); |
603 | return rXST; |
017512f2 |
604 | } |
f8ef8ff7 |
605 | |
017512f2 |
606 | static void write_XST(u32 d) |
f8ef8ff7 |
607 | { |
017512f2 |
608 | // can be removed? |
609 | u32 r = pm_io(3, 1, d); |
610 | if (r != (u32)-1) return; |
611 | |
5de27868 |
612 | elprintf(EL_SVP, "XST raw w %04x @ %04x", d, GET_PPC_OFFS()); |
d26dc685 |
613 | rPM0 |= 1; |
5de27868 |
614 | rXST = d; |
017512f2 |
615 | } |
616 | |
617 | // 12 |
618 | static u32 read_PM4(void) |
619 | { |
620 | u32 d = pm_io(4, 0, 0); |
30752975 |
621 | if (d == 0) { |
622 | switch (GET_PPC_OFFS()) { |
d26dc685 |
623 | case 0x0854: ssp->emu_status |= SSP_WAIT_30FE08; elprintf(EL_SVP, "det TIGHT loop: [30fe08]"); break; |
624 | case 0x4f12: ssp->emu_status |= SSP_WAIT_30FE06; elprintf(EL_SVP, "det TIGHT loop: [30fe06]"); break; |
30752975 |
625 | } |
626 | } |
017512f2 |
627 | if (d != (u32)-1) return d; |
628 | // can be removed? |
5de27868 |
629 | elprintf(EL_SVP, "PM4 raw r %04x @ %04x", rPM4, GET_PPC_OFFS()); |
630 | return rPM4; |
017512f2 |
631 | } |
632 | |
633 | static void write_PM4(u32 d) |
634 | { |
635 | u32 r = pm_io(4, 1, d); |
636 | if (r != (u32)-1) return; |
637 | // can be removed? |
5de27868 |
638 | elprintf(EL_SVP, "PM4 raw w %04x @ %04x", d, GET_PPC_OFFS()); |
639 | rPM4 = d; |
017512f2 |
640 | } |
641 | |
642 | // 14 |
643 | static u32 read_PMC(void) |
644 | { |
3554b0a4 |
645 | elprintf(EL_SVP, "PMC r a %04x (st %c) @ %04x", rPMC.h, |
646 | (ssp->emu_status & SSP_PMC_HAVE_ADDR) ? 'm' : 'a', GET_PPC_OFFS()); |
017512f2 |
647 | if (ssp->emu_status & SSP_PMC_HAVE_ADDR) { |
3554b0a4 |
648 | //if (ssp->emu_status & SSP_PMC_SET) |
649 | // elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PPC_OFFS()); |
017512f2 |
650 | ssp->emu_status |= SSP_PMC_SET; |
5de27868 |
651 | ssp->emu_status &= ~SSP_PMC_HAVE_ADDR; |
017512f2 |
652 | } else { |
653 | ssp->emu_status |= SSP_PMC_HAVE_ADDR; |
017512f2 |
654 | } |
3554b0a4 |
655 | return rPMC.h; |
017512f2 |
656 | } |
657 | |
658 | static void write_PMC(u32 d) |
659 | { |
660 | if (ssp->emu_status & SSP_PMC_HAVE_ADDR) { |
3554b0a4 |
661 | //if (ssp->emu_status & SSP_PMC_SET) |
662 | // elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PPC_OFFS()); |
017512f2 |
663 | ssp->emu_status |= SSP_PMC_SET; |
5de27868 |
664 | ssp->emu_status &= ~SSP_PMC_HAVE_ADDR; |
017512f2 |
665 | rPMC.l = d; |
67256d4b |
666 | elprintf(EL_SVP, "PMC w m %04x @ %04x", rPMC.l, GET_PPC_OFFS()); |
017512f2 |
667 | } else { |
668 | ssp->emu_status |= SSP_PMC_HAVE_ADDR; |
669 | rPMC.h = d; |
67256d4b |
670 | elprintf(EL_SVP, "PMC w a %04x @ %04x", rPMC.h, GET_PPC_OFFS()); |
017512f2 |
671 | } |
672 | } |
673 | |
674 | // 15 |
675 | static u32 read_AL(void) |
676 | { |
67256d4b |
677 | if (*(PC-1) == 0x000f) { |
3554b0a4 |
678 | elprintf(EL_SVP|EL_ANOMALY, "ssp dummy PM assign %08x @ %04x", rPMC.v, GET_PPC_OFFS()); |
67256d4b |
679 | ssp->emu_status &= ~(SSP_PMC_SET|SSP_PMC_HAVE_ADDR); // ? |
67256d4b |
680 | } |
017512f2 |
681 | return rAL; |
682 | } |
683 | |
684 | static void write_AL(u32 d) |
685 | { |
686 | rAL = d; |
687 | } |
688 | |
689 | |
690 | typedef u32 (*read_func_t)(void); |
691 | typedef void (*write_func_t)(u32 d); |
692 | |
693 | static read_func_t read_handlers[16] = |
694 | { |
695 | read_unknown, read_unknown, read_unknown, read_unknown, // -, X, Y, A |
696 | read_unknown, // 4 ST |
697 | read_STACK, |
698 | read_PC, |
699 | read_P, |
700 | read_PM0, // 8 |
701 | read_PM1, |
702 | read_PM2, |
703 | read_XST, |
704 | read_PM4, // 12 |
705 | read_unknown, // 13 gr13 |
706 | read_PMC, |
707 | read_AL |
708 | }; |
709 | |
710 | static write_func_t write_handlers[16] = |
711 | { |
712 | write_unknown, write_unknown, write_unknown, write_unknown, // -, X, Y, A |
5de27868 |
713 | // write_unknown, // 4 ST |
714 | write_ST, // 4 ST (debug hook) |
017512f2 |
715 | write_STACK, |
716 | write_PC, |
717 | write_unknown, // 7 P |
718 | write_PM0, // 8 |
719 | write_PM1, |
720 | write_PM2, |
721 | write_XST, |
722 | write_PM4, // 12 |
723 | write_unknown, // 13 gr13 |
724 | write_PMC, |
725 | write_AL |
726 | }; |
727 | |
5de27868 |
728 | // ----------------------------------------------------- |
729 | // pointer register handlers |
730 | |
731 | // |
732 | #define ptr1_read(op) ptr1_read_(op&3,(op>>6)&4,(op<<1)&0x18) |
733 | |
734 | static u32 ptr1_read_(int ri, int isj2, int modi3) |
735 | { |
736 | //int t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18); |
30752975 |
737 | u32 mask, add = 0, t = ri | isj2 | modi3; |
738 | unsigned char *rp = NULL; |
5de27868 |
739 | switch (t) |
740 | { |
741 | // mod=0 (00) |
742 | case 0x00: |
743 | case 0x01: |
744 | case 0x02: return ssp->RAM0[ssp->r0[t&3]]; |
745 | case 0x03: return ssp->RAM0[0]; |
746 | case 0x04: |
747 | case 0x05: |
748 | case 0x06: return ssp->RAM1[ssp->r1[t&3]]; |
749 | case 0x07: return ssp->RAM1[0]; |
750 | // mod=1 (01), "+!" |
5de27868 |
751 | case 0x08: |
5de27868 |
752 | case 0x09: |
30752975 |
753 | case 0x0a: return ssp->RAM0[ssp->r0[t&3]++]; |
5de27868 |
754 | case 0x0b: return ssp->RAM0[1]; |
755 | case 0x0c: |
5de27868 |
756 | case 0x0d: |
30752975 |
757 | case 0x0e: return ssp->RAM1[ssp->r1[t&3]++]; |
5de27868 |
758 | case 0x0f: return ssp->RAM1[1]; |
759 | // mod=2 (10), "-" |
760 | case 0x10: |
761 | case 0x11: |
30752975 |
762 | case 0x12: rp = &ssp->r0[t&3]; t = ssp->RAM0[*rp]; |
763 | if (!(rST&7)) { (*rp)--; return t; } |
764 | add = -1; goto modulo; |
5de27868 |
765 | case 0x13: return ssp->RAM0[2]; |
766 | case 0x14: |
767 | case 0x15: |
30752975 |
768 | case 0x16: rp = &ssp->r1[t&3]; t = ssp->RAM1[*rp]; |
769 | if (!(rST&7)) { (*rp)--; return t; } |
770 | add = -1; goto modulo; |
5de27868 |
771 | case 0x17: return ssp->RAM1[2]; |
30752975 |
772 | // mod=3 (11), "+" |
773 | case 0x18: |
774 | case 0x19: |
775 | case 0x1a: rp = &ssp->r0[t&3]; t = ssp->RAM0[*rp]; |
776 | if (!(rST&7)) { (*rp)++; return t; } |
777 | add = 1; goto modulo; |
5de27868 |
778 | case 0x1b: return ssp->RAM0[3]; |
30752975 |
779 | case 0x1c: |
780 | case 0x1d: |
781 | case 0x1e: rp = &ssp->r1[t&3]; t = ssp->RAM1[*rp]; |
782 | if (!(rST&7)) { (*rp)++; return t; } |
783 | add = 1; goto modulo; |
5de27868 |
784 | case 0x1f: return ssp->RAM1[3]; |
785 | } |
786 | |
787 | return 0; |
30752975 |
788 | |
789 | modulo: |
790 | mask = (1 << (rST&7)) - 1; |
791 | *rp = (*rp & ~mask) | ((*rp + add) & mask); |
792 | return t; |
5de27868 |
793 | } |
794 | |
795 | static void ptr1_write(int op, u32 d) |
796 | { |
797 | int t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18); |
798 | switch (t) |
799 | { |
800 | // mod=0 (00) |
801 | case 0x00: |
802 | case 0x01: |
803 | case 0x02: ssp->RAM0[ssp->r0[t&3]] = d; return; |
804 | case 0x03: ssp->RAM0[0] = d; return; |
805 | case 0x04: |
806 | case 0x05: |
807 | case 0x06: ssp->RAM1[ssp->r1[t&3]] = d; return; |
808 | case 0x07: ssp->RAM1[0] = d; return; |
809 | // mod=1 (01), "+!" |
810 | // mod=3, "+" |
811 | case 0x08: |
812 | case 0x18: |
813 | case 0x09: |
814 | case 0x19: |
815 | case 0x0a: |
816 | case 0x1a: ssp->RAM0[ssp->r0[t&3]++] = d; return; |
817 | case 0x0b: ssp->RAM0[1] = d; return; |
818 | case 0x0c: |
819 | case 0x1c: |
820 | case 0x0d: |
821 | case 0x1d: |
822 | case 0x0e: |
823 | case 0x1e: ssp->RAM1[ssp->r1[t&3]++] = d; return; |
824 | case 0x0f: ssp->RAM1[1] = d; return; |
825 | // mod=2 (10), "-" |
826 | case 0x10: |
827 | case 0x11: |
828 | case 0x12: ssp->RAM0[ssp->r0[t&3]--] = d; return; |
829 | case 0x13: ssp->RAM0[2] = d; return; |
830 | case 0x14: |
831 | case 0x15: |
832 | case 0x16: ssp->RAM1[ssp->r1[t&3]--] = d; return; |
833 | case 0x17: ssp->RAM1[2] = d; return; |
834 | // mod=3 (11) |
835 | case 0x1b: ssp->RAM0[3] = d; return; |
836 | case 0x1f: ssp->RAM1[3] = d; return; |
837 | } |
838 | } |
839 | |
840 | static u32 ptr2_read(int op) |
841 | { |
842 | int mv = 0, t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18); |
843 | switch (t) |
844 | { |
845 | // mod=0 (00) |
846 | case 0x00: |
847 | case 0x01: |
848 | case 0x02: mv = ssp->RAM0[ssp->r0[t&3]]++; break; |
849 | case 0x03: mv = ssp->RAM0[0]++; break; |
850 | case 0x04: |
851 | case 0x05: |
852 | case 0x06: mv = ssp->RAM1[ssp->r1[t&3]]++; break; |
853 | case 0x07: mv = ssp->RAM1[0]++; break; |
854 | // mod=1 (01) |
855 | case 0x0b: mv = ssp->RAM0[1]++; break; |
856 | case 0x0f: mv = ssp->RAM1[1]++; break; |
857 | // mod=2 (10) |
858 | case 0x13: mv = ssp->RAM0[2]++; break; |
859 | case 0x17: mv = ssp->RAM1[2]++; break; |
860 | // mod=3 (11) |
861 | case 0x1b: mv = ssp->RAM0[3]++; break; |
862 | case 0x1f: mv = ssp->RAM1[3]++; break; |
30752975 |
863 | default: elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: invalid mod in ((rX))? @ %04x", GET_PPC_OFFS()); |
5de27868 |
864 | return 0; |
865 | } |
866 | |
867 | return ((unsigned short *)svp->iram_rom)[mv]; |
868 | } |
869 | |
870 | |
871 | // ----------------------------------------------------- |
872 | |
017512f2 |
873 | void ssp1601_reset(ssp1601_t *l_ssp) |
874 | { |
875 | ssp = l_ssp; |
f8ef8ff7 |
876 | ssp->emu_status = 0; |
017512f2 |
877 | ssp->gr[SSP_GR0].v = 0xffff0000; |
f8ef8ff7 |
878 | rPC = 0x400; |
5de27868 |
879 | rSTACK = 0; // ? using ascending stack |
30752975 |
880 | rST = 0; |
f8ef8ff7 |
881 | } |
882 | |
883 | |
3554b0a4 |
884 | #ifdef USE_DEBUGGER |
5de27868 |
885 | static void debug_dump(void) |
f8ef8ff7 |
886 | { |
5de27868 |
887 | printf("GR0: %04x X: %04x Y: %04x A: %08x\n", ssp->gr[SSP_GR0].h, rX, rY, ssp->gr[SSP_A].v); |
888 | printf("PC: %04x (%04x) P: %08x\n", GET_PC(), GET_PC() << 1, ssp->gr[SSP_P].v); |
889 | printf("PM0: %04x PM1: %04x PM2: %04x\n", rPM0, rPM1, rPM2); |
890 | printf("XST: %04x PM4: %04x PMC: %08x\n", rXST, rPM4, ssp->gr[SSP_PMC].v); |
d26dc685 |
891 | 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', |
892 | rST&SSP_FLAG_Z?'Z':'z', rST&SSP_FLAG_L?'L':'l', (rST>>5)&1, (rST>>6)&1); |
5de27868 |
893 | printf("STACK: %i %04x %04x %04x %04x %04x %04x\n", rSTACK, ssp->stack[0], ssp->stack[1], |
894 | ssp->stack[2], ssp->stack[3], ssp->stack[4], ssp->stack[5]); |
895 | printf("r0-r2: %02x %02x %02x r4-r6: %02x %02x %02x\n", rIJ[0], rIJ[1], rIJ[2], rIJ[4], rIJ[5], rIJ[6]); |
896 | elprintf(EL_SVP, "cycles: %i, emu_status: %x", g_cycles, ssp->emu_status); |
897 | } |
f8ef8ff7 |
898 | |
5de27868 |
899 | static void debug_dump_mem(void) |
900 | { |
901 | int h, i; |
902 | printf("RAM0\n"); |
903 | for (h = 0; h < 32; h++) |
904 | { |
905 | if (h == 16) printf("RAM1\n"); |
906 | printf("%03x:", h*16); |
907 | for (i = 0; i < 16; i++) |
908 | printf(" %04x", ssp->RAM[h*16+i]); |
909 | printf("\n"); |
910 | } |
911 | } |
912 | |
30752975 |
913 | static void debug_dump2file(const char *fname, void *mem, int len) |
914 | { |
915 | FILE *f = fopen(fname, "wb"); |
916 | unsigned short *p = mem; |
917 | int i; |
918 | if (f) { |
919 | for (i = 0; i < len/2; i++) p[i] = (p[i]<<8) | (p[i]>>8); |
920 | fwrite(mem, 1, len, f); |
921 | fclose(f); |
922 | for (i = 0; i < len/2; i++) p[i] = (p[i]<<8) | (p[i]>>8); |
923 | printf("dumped to %s\n", fname); |
924 | } |
925 | else |
926 | printf("dump failed\n"); |
927 | } |
928 | |
5de27868 |
929 | static int bpts[10] = { 0, }; |
930 | |
931 | static void debug(unsigned int pc, unsigned int op) |
932 | { |
933 | static char buffo[64] = {0,}; |
934 | char buff[64] = {0,}; |
935 | int i; |
936 | |
937 | if (running) { |
938 | for (i = 0; i < 10; i++) |
939 | if (pc != 0 && bpts[i] == pc) { |
940 | printf("breakpoint %i\n", i); |
941 | running = 0; |
942 | break; |
943 | } |
944 | } |
945 | if (running) return; |
946 | |
947 | printf("%04x (%02x) @ %04x\n", op, op >> 9, pc<<1); |
948 | |
949 | while (1) |
950 | { |
951 | printf("dbg> "); |
952 | fflush(stdout); |
953 | fgets(buff, sizeof(buff), stdin); |
954 | if (buff[0] == '\n') strcpy(buff, buffo); |
955 | else strcpy(buffo, buff); |
956 | |
957 | switch (buff[0]) { |
958 | case 0: exit(0); |
959 | case 'c': |
960 | case 'r': running = 1; return; |
961 | case 's': |
962 | case 'n': return; |
963 | case 'x': debug_dump(); break; |
964 | case 'm': debug_dump_mem(); break; |
965 | case 'b': { |
966 | char *baddr = buff + 2; |
967 | i = 0; |
968 | if (buff[3] == ' ') { i = buff[2] - '0'; baddr = buff + 4; } |
969 | bpts[i] = strtol(baddr, NULL, 16) >> 1; |
970 | printf("breakpoint %i set @ %04x\n", i, bpts[i]<<1); |
971 | break; |
972 | } |
30752975 |
973 | case 'd': |
974 | sprintf(buff, "iramrom_%04x.bin", last_iram); |
975 | debug_dump2file(buff, svp->iram_rom, sizeof(svp->iram_rom)); |
976 | debug_dump2file("dram.bin", svp->dram, sizeof(svp->dram)); |
5de27868 |
977 | break; |
5de27868 |
978 | default: printf("unknown command\n"); break; |
979 | } |
980 | } |
981 | } |
3554b0a4 |
982 | #endif // USE_DEBUGGER |
983 | |
5de27868 |
984 | |
985 | void ssp1601_run(int cycles) |
986 | { |
017512f2 |
987 | SET_PC(rPC); |
988 | g_cycles = cycles; |
f8ef8ff7 |
989 | |
d26dc685 |
990 | while (g_cycles > 0 && !(ssp->emu_status & SSP_WAIT_MASK)) |
f8ef8ff7 |
991 | { |
5de27868 |
992 | int op; |
993 | u32 tmpv; |
994 | |
995 | op = *PC++; |
3554b0a4 |
996 | #ifdef USE_DEBUGGER |
5de27868 |
997 | debug(GET_PC()-1, op); |
3554b0a4 |
998 | #endif |
f8ef8ff7 |
999 | switch (op >> 9) |
1000 | { |
1001 | // ld d, s |
5de27868 |
1002 | case 0x00: |
f8ef8ff7 |
1003 | if (op == 0) break; // nop |
017512f2 |
1004 | if (op == ((SSP_A<<4)|SSP_P)) { // A <- P |
1005 | // not sure. MAME claims that only hi word is transfered. |
1006 | read_P(); // update P |
4bfc6da4 |
1007 | rA32 = ssp->gr[SSP_P].v; |
f8ef8ff7 |
1008 | } |
5de27868 |
1009 | else |
f8ef8ff7 |
1010 | { |
5de27868 |
1011 | tmpv = REG_READ(op & 0x0f); |
1012 | REG_WRITE((op & 0xf0) >> 4, tmpv); |
1013 | } |
1014 | break; |
1015 | |
1016 | // ld d, (ri) |
1017 | case 0x01: tmpv = ptr1_read(op); REG_WRITE((op & 0xf0) >> 4, tmpv); break; |
1018 | |
1019 | // ld (ri), s |
1020 | case 0x02: tmpv = REG_READ((op & 0xf0) >> 4); ptr1_write(op, tmpv); break; |
1021 | |
1022 | // ldi d, imm |
1023 | case 0x04: tmpv = *PC++; REG_WRITE((op & 0xf0) >> 4, tmpv); break; |
1024 | |
1025 | // ld d, ((ri)) |
1026 | case 0x05: tmpv = ptr2_read(op); REG_WRITE((op & 0xf0) >> 4, tmpv); break; |
1027 | |
1028 | // ldi (ri), imm |
1029 | case 0x06: tmpv = *PC++; ptr1_write(op, tmpv); break; |
1030 | |
1031 | // ld adr, a |
1032 | case 0x07: ssp->RAM[op & 0x1ff] = rA; break; |
1033 | |
1034 | // ld d, ri |
1035 | case 0x09: tmpv = rIJ[(op&3)|((op>>6)&4)]; REG_WRITE((op & 0xf0) >> 4, tmpv); break; |
1036 | |
1037 | // ld ri, s |
1038 | case 0x0a: rIJ[(op&3)|((op>>6)&4)] = REG_READ((op & 0xf0) >> 4); break; |
1039 | |
1040 | // ldi ri, simm |
1041 | case 0x0c: |
1042 | case 0x0d: |
1043 | case 0x0e: |
1044 | case 0x0f: rIJ[(op>>8)&7] = op; break; |
1045 | |
1046 | // call cond, addr |
1047 | case 0x24: { |
1048 | int cond = 0; |
1049 | COND_CHECK |
1050 | if (cond) { int new_PC = *PC++; write_STACK(GET_PC()); write_PC(new_PC); } |
1051 | else PC++; |
1052 | break; |
1053 | } |
1054 | |
1055 | // ld d, (a) |
1056 | case 0x25: tmpv = ((unsigned short *)svp->iram_rom)[rA]; REG_WRITE((op & 0xf0) >> 4, tmpv); break; |
1057 | |
1058 | // bra cond, addr |
1059 | case 0x26: { |
1060 | int cond = 0; |
1061 | COND_CHECK |
1062 | if (cond) { int new_PC = *PC++; write_PC(new_PC); } |
1063 | else PC++; |
1064 | break; |
1065 | } |
1066 | |
1067 | // mod cond, op |
1068 | case 0x48: { |
1069 | int cond = 0; |
1070 | COND_CHECK |
1071 | if (cond) { |
1072 | switch (op & 7) { |
d26dc685 |
1073 | case 2: rA32 = (signed int)rA32 >> 1; break; // shr (arithmetic) |
5de27868 |
1074 | case 3: rA32 <<= 1; break; // shl |
d26dc685 |
1075 | case 6: rA32 = -(signed int)rA32; break; // neg |
1076 | case 7: if ((int)rA32 < 0) rA32 = -(signed int)rA32; break; // abs |
3554b0a4 |
1077 | default: elprintf(EL_SVP, "ssp FIXME: unhandled mod %i @ %04x", op&7, GET_PPC_OFFS()); |
5de27868 |
1078 | } |
30752975 |
1079 | UPD_ACC_ZN // ? |
f8ef8ff7 |
1080 | } |
1081 | break; |
5de27868 |
1082 | } |
1083 | |
3554b0a4 |
1084 | // ??? |
30752975 |
1085 | case 0x1b: |
3554b0a4 |
1086 | #if 0 |
30752975 |
1087 | // very uncertain about this one. What about b? |
3554b0a4 |
1088 | if (!(op&0x100)) elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: no b bit @ %04x", GET_PPC_OFFS()); |
30752975 |
1089 | read_P(); // update P |
4bfc6da4 |
1090 | rA32 -= ssp->gr[SSP_P].v; // maybe only upper word? |
1091 | // UPD_ACC_ZN // I've seen code checking flags after this |
30752975 |
1092 | rX = ptr1_read_(op&3, 0, (op<<1)&0x18); // ri (maybe rj?) |
1093 | rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18); // rj |
30752975 |
1094 | #endif |
3554b0a4 |
1095 | break; |
1096 | |
5de27868 |
1097 | // mpya (rj), (ri), b |
1098 | case 0x4b: |
1099 | // dunno if this is correct. What about b? |
3554b0a4 |
1100 | if (!(op&0x100)) elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: no b bit @ %04x", GET_PPC_OFFS()); |
5de27868 |
1101 | read_P(); // update P |
3554b0a4 |
1102 | rA32 += ssp->gr[SSP_P].v; // confirmed to be 32bit |
d26dc685 |
1103 | UPD_ACC_ZN // ? |
5de27868 |
1104 | rX = ptr1_read_(op&3, 0, (op<<1)&0x18); // ri (maybe rj?) |
1105 | rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18); // rj |
1106 | break; |
1107 | |
1108 | // mld (rj), (ri), b |
1109 | case 0x5b: |
1110 | // dunno if this is correct. What about b? |
3554b0a4 |
1111 | if (!(op&0x100)) elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: no b bit @ %04x", GET_PPC_OFFS()); |
1112 | rA32 = 0; |
4bfc6da4 |
1113 | rST &= 0x0fff; // ? |
5de27868 |
1114 | rX = ptr1_read_(op&3, 0, (op<<1)&0x18); // ri (maybe rj?) |
1115 | rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18); // rj |
1116 | break; |
1117 | |
1118 | // OP a, s |
67256d4b |
1119 | case 0x10: OP_CHECK32(OP_SUBA32); tmpv = REG_READ(op & 0x0f); OP_SUBA(tmpv); break; |
1120 | case 0x30: OP_CHECK32(OP_CMPA32); tmpv = REG_READ(op & 0x0f); OP_CMPA(tmpv); break; |
1121 | case 0x40: OP_CHECK32(OP_ADDA32); tmpv = REG_READ(op & 0x0f); OP_ADDA(tmpv); break; |
1122 | case 0x50: OP_CHECK32(OP_ANDA32); tmpv = REG_READ(op & 0x0f); OP_ANDA(tmpv); break; |
1123 | case 0x60: OP_CHECK32(OP_ORA32 ); tmpv = REG_READ(op & 0x0f); OP_ORA (tmpv); break; |
1124 | case 0x70: OP_CHECK32(OP_EORA32); tmpv = REG_READ(op & 0x0f); OP_EORA(tmpv); break; |
5de27868 |
1125 | |
1126 | // OP a, (ri) |
1127 | case 0x11: tmpv = ptr1_read(op); OP_SUBA(tmpv); break; |
1128 | case 0x31: tmpv = ptr1_read(op); OP_CMPA(tmpv); break; |
1129 | case 0x41: tmpv = ptr1_read(op); OP_ADDA(tmpv); break; |
1130 | case 0x51: tmpv = ptr1_read(op); OP_ANDA(tmpv); break; |
1131 | case 0x61: tmpv = ptr1_read(op); OP_ORA (tmpv); break; |
1132 | case 0x71: tmpv = ptr1_read(op); OP_EORA(tmpv); break; |
1133 | |
1134 | // OP a, adr |
1135 | case 0x03: tmpv = ssp->RAM[op & 0x1ff]; OP_LDA (tmpv); break; |
1136 | case 0x13: tmpv = ssp->RAM[op & 0x1ff]; OP_SUBA(tmpv); break; |
1137 | case 0x33: tmpv = ssp->RAM[op & 0x1ff]; OP_CMPA(tmpv); break; |
1138 | case 0x43: tmpv = ssp->RAM[op & 0x1ff]; OP_ADDA(tmpv); break; |
1139 | case 0x53: tmpv = ssp->RAM[op & 0x1ff]; OP_ANDA(tmpv); break; |
1140 | case 0x63: tmpv = ssp->RAM[op & 0x1ff]; OP_ORA (tmpv); break; |
1141 | case 0x73: tmpv = ssp->RAM[op & 0x1ff]; OP_EORA(tmpv); break; |
1142 | |
1143 | // OP a, imm |
1144 | case 0x14: tmpv = *PC++; OP_SUBA(tmpv); break; |
1145 | case 0x34: tmpv = *PC++; OP_CMPA(tmpv); break; |
1146 | case 0x44: tmpv = *PC++; OP_ADDA(tmpv); break; |
1147 | case 0x54: tmpv = *PC++; OP_ANDA(tmpv); break; |
1148 | case 0x64: tmpv = *PC++; OP_ORA (tmpv); break; |
1149 | case 0x74: tmpv = *PC++; OP_EORA(tmpv); break; |
1150 | |
1151 | // OP a, ((ri)) |
1152 | case 0x15: tmpv = ptr2_read(op); OP_SUBA(tmpv); break; |
1153 | case 0x35: tmpv = ptr2_read(op); OP_CMPA(tmpv); break; |
1154 | case 0x45: tmpv = ptr2_read(op); OP_ADDA(tmpv); break; |
1155 | case 0x55: tmpv = ptr2_read(op); OP_ANDA(tmpv); break; |
1156 | case 0x65: tmpv = ptr2_read(op); OP_ORA (tmpv); break; |
1157 | case 0x75: tmpv = ptr2_read(op); OP_EORA(tmpv); break; |
1158 | |
1159 | // OP a, ri |
1160 | case 0x19: tmpv = rIJ[IJind]; OP_SUBA(tmpv); break; |
1161 | case 0x39: tmpv = rIJ[IJind]; OP_CMPA(tmpv); break; |
1162 | case 0x49: tmpv = rIJ[IJind]; OP_ADDA(tmpv); break; |
1163 | case 0x59: tmpv = rIJ[IJind]; OP_ANDA(tmpv); break; |
1164 | case 0x69: tmpv = rIJ[IJind]; OP_ORA (tmpv); break; |
1165 | case 0x79: tmpv = rIJ[IJind]; OP_EORA(tmpv); break; |
1166 | |
1167 | // OP simm |
4bfc6da4 |
1168 | case 0x1c: OP_SUBA(op & 0xff); if (op&0x100) elprintf(EL_SVP, "FIXME: simm with upper bit set"); break; |
1169 | case 0x3c: OP_CMPA(op & 0xff); if (op&0x100) elprintf(EL_SVP, "FIXME: simm with upper bit set"); break; |
1170 | case 0x4c: OP_ADDA(op & 0xff); if (op&0x100) elprintf(EL_SVP, "FIXME: simm with upper bit set"); break; |
5de27868 |
1171 | // MAME code only does LSB of top word, but this looks wrong to me. |
4bfc6da4 |
1172 | case 0x5c: OP_ANDA(op & 0xff); if (op&0x100) elprintf(EL_SVP, "FIXME: simm with upper bit set"); break; |
1173 | case 0x6c: OP_ORA (op & 0xff); if (op&0x100) elprintf(EL_SVP, "FIXME: simm with upper bit set"); break; |
1174 | case 0x7c: OP_EORA(op & 0xff); if (op&0x100) elprintf(EL_SVP, "FIXME: simm with upper bit set"); break; |
f8ef8ff7 |
1175 | |
1176 | default: |
3554b0a4 |
1177 | elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME unhandled op %04x @ %04x", op, GET_PPC_OFFS()); |
017512f2 |
1178 | break; |
f8ef8ff7 |
1179 | } |
017512f2 |
1180 | g_cycles--; |
f8ef8ff7 |
1181 | } |
1182 | |
017512f2 |
1183 | read_P(); // update P |
f8ef8ff7 |
1184 | rPC = GET_PC(); |
017512f2 |
1185 | |
1186 | if (ssp->gr[SSP_GR0].v != 0xffff0000) |
3554b0a4 |
1187 | elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: REG 0 corruption! %08x", ssp->gr[SSP_GR0].v); |
f8ef8ff7 |
1188 | } |
1189 | |