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- fix for ticker #4787
[oscam.git] / reader-dre-st20.c
blobf40d423898ec59b47fcee605415b9c696f2dd51e
1 #include "globals.h"
2 #include "reader-dre-st20.h"
3
4 #define IPTR 0
5 #define WPTR 1
6 #define AREG 2
7 #define BREG 3
8 #define CREG 4
9
10 #define FLASHS 0x7FE00000
11 #define FLASHE 0x7FFFFFFF
12 #define RAMS 0x40000000
13 #define RAME 0x401FFFFF
14 #define IRAMS 0x80000000
15 #define IRAME 0x800017FF
16
17 #define ERR_ILL_OP -1
18 #define ERR_CNT -2
19
20 // ----------------------------------------------------------------
21
22 #define STACKMAX 16
23 #define STACKMASK (STACKMAX-1)
24
25 typedef struct
26 {
27 uint32_t Iptr, Wptr;
28 uint8_t *flash, *ram;
29 uint32_t flashSize, ramSize;
30 int sptr, stack[STACKMAX];
31 uint8_t iram[0x1800];
32 int invalid;
33 int verbose;
34 } st20_context_t;
35
36 static void st20_set_flash(st20_context_t *ctx, uint8_t *m, int len);
37 static void st20_set_ram(st20_context_t *ctx, uint8_t *m, int len);
38 static void st20_init(st20_context_t *ctx, uint32_t IPtr, uint32_t WPtr, int verbose);
39 static void st20_free(st20_context_t *ctx);
40
41 static void st20_set_call_frame(st20_context_t *ctx, uint32_t raddr, int p1, int p2, int p3);
42
43 static uint32_t st20_get_reg(st20_context_t *ctx, int reg);
44 static void st20_set_reg(st20_context_t *ctx, int reg, uint32_t val);
45 static uint8_t st20_rbyte(st20_context_t *ctx, uint32_t off);
46 static void st20_wbyte(st20_context_t *ctx, uint32_t off, uint8_t val);
47 static uint32_t st20_rword(st20_context_t *ctx, uint32_t off);
48 static void st20_wword(st20_context_t *ctx, uint32_t off, uint32_t val);
49
50 #define INVALID_VALUE 0xCCCCCCCC
51 #define ERRORVAL 0xDEADBEEF
52
53 #define MININT 0x7FFFFFFF
54 #define MOSTPOS 0x7FFFFFFF
55 #define MOSTNEG 0x80000000
56
57 #define POP() ctx->stack[(ctx->sptr++)&STACKMASK]
58 #define PUSH(v) do { int32_t __v=(v); ctx->stack[(--ctx->sptr)&STACKMASK]=__v; } while(0)
59 #define DROP(n) ctx->sptr+=n
60
61 #define AAA ctx->stack[ctx->sptr&STACKMASK]
62 #define BBB ctx->stack[(ctx->sptr+1)&STACKMASK]
63 #define CCC ctx->stack[(ctx->sptr+2)&STACKMASK]
64
65 #define GET_OP() operand|=op1&0x0F
66 #define CLEAR_OP() operand=0
67 #define JUMP(x) ctx->Iptr+=(x)
68 #define POP64() ({ uint32_t __b=POP(); ((uint64_t)POP()<<32)|__b; })
69 #define PUSHPOP(op,val) do { int32_t __a=val; AAA op##= (__a); } while(0)
70
71 #define RB(off) st20_rbyte(ctx, off)
72 #define RW(off) st20_rword(ctx, off)
73 #define WW(off,val) st20_wword(ctx, off, val)
74
75 static uint32_t st20_get_reg(st20_context_t *ctx, int32_t reg)
76 {
77 switch(reg)
78 {
79 case IPTR: return ctx->Iptr;
80 case WPTR: return ctx->Wptr;
81 case AREG: return AAA;
82 case BREG: return BBB;
83 case CREG: return CCC;
84 }
85 return 0;
86 }
87
88 static void st20_set_reg(st20_context_t *ctx, int32_t reg, uint32_t val)
89 {
90 switch(reg)
91 {
92 case IPTR: ctx->Iptr = val; return;
93 case WPTR: ctx->Wptr = val; return;
94 case AREG: AAA=val; return;
95 case BREG: BBB=val; return;
96 case CREG: CCC=val; return;
97 }
98 }
99
100 static uint8_t *st20_addr(st20_context_t *ctx, uint32_t off)
101 {
102 if(off >= FLASHS && off <= FLASHE)
103 {
104 return &ctx->flash[off - FLASHS];
105 }
106 else if(off >= RAMS && off <= RAME)
107 {
108 return &ctx->ram[off - RAMS];
109 }
110 else if(off >= IRAMS && off <= IRAME)
111 {
112 return &ctx->iram[off - IRAMS];
113 }
114
115 ctx->invalid = ERRORVAL;
116 return (uint8_t *) &ctx->invalid;
117 }
118
119 static uint32_t st20_rword(st20_context_t *ctx, uint32_t off)
120 {
121 uint8_t *temp;
122 temp = st20_addr(ctx, off);
123
124 return ((temp[3] << 24) | (temp[2] << 16) | (temp[1] << 8) | temp[0]);
125 }
126
127 static uint16_t st20_rshort(st20_context_t *ctx, uint32_t off)
128 {
129 uint8_t *temp;
130 temp = st20_addr(ctx, off);
131
132 return ((temp[0] << 8) | temp[1]);
133 }
134
135 static uint8_t st20_rbyte(st20_context_t *ctx, uint32_t off)
136 {
137 return *st20_addr(ctx, off);
138 }
139
140 static void st20_wword(st20_context_t *ctx, uint32_t off, uint32_t val)
141 {
142 uint8_t *temp;
143 temp = st20_addr(ctx, off);
144 temp[3] = (val >> 24) & 0xFF;
145 temp[2] = (val >> 16) & 0xFF;
146 temp[1] = (val >> 8) & 0xFF;
147 temp[0] = val & 0xFF;
148 }
149
150 static void st20_wbyte(st20_context_t *ctx, uint32_t off, uint8_t val)
151 {
152 uint8_t *temp;
153 temp = st20_addr(ctx, off);
154 temp[0] = val;
155 }
156
157 static int32_t st20_decode(st20_context_t *ctx, int32_t count)
158 {
159 int32_t operand = 0;
160 CLEAR_OP();
161
162 while(ctx->Iptr != 0)
163 {
164 int32_t a, op1 = RB(ctx->Iptr++);
165 GET_OP();
166
167 switch(op1 >> 4)
168 {
169 case 0x0: // j / jump
170 JUMP(operand);
171 CLEAR_OP();
172 break;
173
174 case 0x1: // ldlp
175 PUSH(ctx->Wptr + (operand * 4));
176 CLEAR_OP();
177 break;
178
179 case 0x2: // positive prefix
180 operand <<= 4;
181 break;
182
183 case 0x3: // ldnl
184 AAA=RW(AAA + (operand * 4));
185 CLEAR_OP();
186 break;
187
188 case 0x4: // ldc
189 PUSH(operand);
190 CLEAR_OP();
191 break;
192
193 case 0x5: // ldnlp
194 PUSHPOP(+, operand * 4);
195 CLEAR_OP();
196 break;
197
198 case 0x6: // negative prefix
199 operand = (~operand) << 4;
200 break;
201
202 case 0x7: // ldl
203 PUSH(RW(ctx->Wptr + (operand * 4)));
204 CLEAR_OP();
205 break;
206
207 case 0x8: // adc
208 PUSHPOP(+, operand);
209 CLEAR_OP();
210 break;
211
212 case 0x9: // call
213 ctx->Wptr -= 16;
214 WW(ctx->Wptr, ctx->Iptr); WW(ctx->Wptr + 4, POP()); WW(ctx->Wptr + 8, POP()); WW(ctx->Wptr + 12, POP());
215 PUSH(ctx->Iptr);
216 JUMP(operand);
217 CLEAR_OP();
218 break;
219
220 case 0xA: // cj / conditional jump
221 if(AAA) { DROP(1); } else { JUMP(operand); }
222 CLEAR_OP();
223 break;
224
225 case 0xB: // ajw / adjust workspace
226 ctx->Wptr += operand * 4;
227 CLEAR_OP();
228 break;
229
230 case 0xC: // eqc / equals constant
231 AAA = (operand == AAA ? 1 : 0);
232 CLEAR_OP();
233 break;
234
235 case 0xD: // stl
236 WW(ctx->Wptr + (operand * 4), POP());
237 CLEAR_OP();
238 break;
239
240 case 0xE: // stnl
241 a = POP(); WW(a + (operand * 4), POP());
242 CLEAR_OP();
243 break;
244
245 case 0xF: // opr (secondary ins)
246 switch(operand)
247 {
248 case 0x00: a = AAA; AAA = BBB; BBB = a; break;
249 case 0x01: AAA = RB(AAA); break;
250 case 0x02: PUSHPOP(+, POP()); break;
251 case 0x04: PUSHPOP(-, POP()); break;
252 case 0x05: PUSHPOP(+, POP()); break;
253 case 0x06: a = AAA; AAA = ctx->Iptr; ctx->Iptr = a; break;
254 case 0x08: PUSHPOP(*, POP()); break;
255 case 0x09: a=POP(); AAA = (AAA > a); break;
256 case 0x0A: a=POP(); AAA = a + (AAA * 4); break;
257 case 0x0C: PUSHPOP(-, POP()); break;
258 case 0x1A: { a = POP(); uint64_t ll = POP64(); PUSH(ll % (uint32_t)a); PUSH(ll / (uint32_t)a); } break;
259 case 0x1B: PUSHPOP(+, ctx->Iptr); break;
260 case 0x1D: CCC = BBB; BBB = (AAA >= 0 ? 0 : -1); break;
261 case 0x1F: PUSHPOP(%, POP()); break;
262 case 0x20: ctx->Iptr = RW(ctx->Wptr); ctx->Wptr = ctx->Wptr + 16; break;
263 case 0x2C: PUSHPOP(/, POP()); break;
264 case 0x30: break;
265 case 0x32: AAA =~ AAA; break;
266 case 0x33: PUSHPOP(^, POP()); break;
267 case 0x34: PUSHPOP(*, 4); break;
268 case 0x35: { a = POP(); uint64_t ll = POP64() >> a; PUSH((ll >> 32) & 0xFFFFFFFF); PUSH(ll & 0xFFFFFFFF); } break;
269 case 0x36: { a = POP(); uint64_t ll = POP64() << a; PUSH((ll >> 32) & 0xFFFFFFFF); PUSH(ll & 0xFFFFFFFF); } break;
270 case 0x3B: a = POP(); st20_wbyte(ctx, a, POP()); break;
271 case 0x3F: a = POP(); PUSH(a & 3); PUSH((uint32_t)a >> 2); break;
272 case 0x40: a = POP(); AAA = (uint32_t)AAA >> a; break;
273 case 0x41: a = POP(); AAA = (uint32_t)AAA << a; break;
274 case 0x42: PUSH(MOSTNEG); break;
275 case 0x46: PUSHPOP(&, POP()); break;
276 case 0x4A: { a = POP(); int32_t b = POP(); int32_t c = POP(); while(a--) st20_wbyte(ctx, b++, st20_rbyte(ctx, c++)); } break;
277 case 0x4B: PUSHPOP(|, POP()); break;
278 case 0x53: PUSHPOP(*, POP()); break;
279 case 0x5A: PUSH(AAA); break;
280 case 0x5F: a = POP(); AAA = ((uint32_t)AAA > (uint32_t)a); break;
281 case 0x78: { a = POP(); int32_t b = POP(); int32_t bb = 0; while(a--){bb <<= 1; bb |= b & 1; b >>= 1;} PUSH(bb);} break;
282 case 0xCA: AAA = st20_rshort(ctx, AAA); break;
283 default:
284 cs_log("[icg] unknown opcode %X", operand);
285 return ERR_ILL_OP;
286 }
287 CLEAR_OP();
288 break;
289 }
290
291 if(--count <= 0 && operand == 0)
292 {
293 return ERR_CNT;
294 }
295 }
296 return 0;
297 }
298
299 static void st20_set_flash(st20_context_t *ctx, uint8_t *m, int32_t len)
300 {
301 if(ctx->flash)
302 {
303 free(ctx->flash);
304 }
305 ctx->flash = malloc(len);
306
307 if(ctx->flash && m)
308 {
309 memcpy(ctx->flash, m, len);
310 }
311 else
312 {
313 memset(ctx->flash, 0, len);
314 }
315 ctx->flashSize = len;
316 }
317
318 static void st20_set_ram(st20_context_t *ctx, uint8_t *m, int32_t len)
319 {
320 if(ctx->ram)
321 {
322 free(ctx->ram);
323 }
324 ctx->ram = malloc(len);
325
326 if(ctx->ram && m)
327 {
328 memcpy(ctx->ram, m, len);
329 }
330 else
331 {
332 memset(ctx->ram, 0, len);
333 }
334 ctx->ramSize = len;
335 }
336
337 static void st20_init(st20_context_t *ctx, uint32_t IPtr, uint32_t WPtr, int32_t verbose)
338 {
339 ctx->Wptr = WPtr;
340 ctx->Iptr = IPtr;
341 memset(ctx->stack, INVALID_VALUE, sizeof(ctx->stack));
342 ctx->sptr = STACKMAX - 3;
343 memset(ctx->iram, 0, sizeof(ctx->iram));
344 ctx->verbose = verbose;
345 }
346
347 static void st20_free(st20_context_t *ctx)
348 {
349 if(ctx->flash)
350 {
351 free(ctx->flash);
352 }
353 ctx->flash = NULL;
354
355 if(ctx->ram)
356 {
357 free(ctx->ram);
358 }
359 ctx->ram = NULL;
360 }
361
362 static void st20_set_call_frame(st20_context_t *ctx, uint32_t raddr, int32_t p1, int32_t p2, int32_t p3)
363 {
364 ctx->Wptr -= 16;
365 st20_wword(ctx, ctx->Wptr, raddr); // RET
366 st20_wword(ctx, ctx->Wptr + 4, p1); // Areg
367 st20_wword(ctx, ctx->Wptr + 8, p1); // Breg
368 st20_wword(ctx, ctx->Wptr + 12, p1); // Creg
369 st20_wword(ctx, ctx->Wptr + 16, p2);
370 st20_wword(ctx, ctx->Wptr + 20, p3);
371 st20_set_reg(ctx, AREG, raddr); // RET
372 }
373
374 int st20_run(uint8_t* snip, uint32_t snip_len, int addr, uint8_t *data, uint16_t overcryptId)
375 {
376 int error = 0, i, n;
377 st20_context_t ctx;
378
379 cs_log("[icg] decrypt address = 0x%X, id = %04X", addr, overcryptId);
380
381 cs_log("[icg] CW: %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X ",
382 data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7],
383 data[8], data[9], data[10], data[11], data[12], data[13], data[14], data[15]);
384
385 for(n = 0; n < 2; n++)
386 {
387 memset(&ctx, 0, sizeof(st20_context_t));
388 st20_set_ram(&ctx, NULL, 0x1000);
389 st20_set_flash(&ctx, snip + 0x48, (int) (snip_len - 0x48));
390 st20_init(&ctx, FLASHS + addr, RAMS + 0x100, 1);
391 st20_set_call_frame(&ctx, 0, RAMS, RAMS, RAMS);
392
393 for(i = 0; i < 8; i++)
394 {
395 st20_wbyte(&ctx, RAMS + i, data[i + n * 8]);
396 }
397
398 if((error = st20_decode(&ctx, 800000)) < 0)
399 {
400 break;
401 }
402
403 cs_log("[icg] cw%d ret = %d, AREG = %X", n + 1, error, st20_get_reg(&ctx, AREG));
404
405 for(i = 0; i < 8; i++)
406 {
407 data[i + n * 8] = st20_rbyte(&ctx, RAMS + i);
408 }
409 st20_free(&ctx);
410 }
411
412 if(error < 0)
413 {
414 cs_log("[icg] st20 processing failed with error %d", error);
415 return 0;
416 }
417
418 cs_log("[icg] DW: %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X ",
419 data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7],
420 data[8], data[9], data[10], data[11], data[12], data[13], data[14], data[15]);
421 return 1;
422 }
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