| 1 | \r |
| 2 | #include "app.h"\r |
| 3 | \r |
| 4 | static FILE *AsmFile=NULL;\r |
| 5 | \r |
| 6 | static int CycloneVer=0x0086; // Version number of library\r |
| 7 | int *CyJump=NULL; // Jump table\r |
| 8 | int ms=USE_MS_SYNTAX; // If non-zero, output in Microsoft ARMASM format\r |
| 9 | char *Narm[4]={ "b", "h","",""}; // Normal ARM Extensions for operand sizes 0,1,2\r |
| 10 | char *Sarm[4]={"sb","sh","",""}; // Sign-extend ARM Extensions for operand sizes 0,1,2\r |
| 11 | int Cycles; // Current cycles for opcode\r |
| 12 | \r |
| 13 | \r |
| 14 | void ot(const char *format, ...)\r |
| 15 | {\r |
| 16 | va_list valist=NULL;\r |
| 17 | int i, len;\r |
| 18 | \r |
| 19 | // notaz: stop me from leaving newlines in the middle of format string\r |
| 20 | // and generating bad code\r |
| 21 | for(i=0, len=strlen(format); i < len && format[i] != '\n'; i++);\r |
| 22 | if(i < len-1 && format[len-1] != '\n') printf("\nWARNING: possible improper newline placement:\n%s\n", format);\r |
| 23 | \r |
| 24 | va_start(valist,format);\r |
| 25 | if (AsmFile) vfprintf(AsmFile,format,valist);\r |
| 26 | va_end(valist);\r |
| 27 | }\r |
| 28 | \r |
| 29 | void ltorg()\r |
| 30 | {\r |
| 31 | if (ms) ot(" LTORG\n");\r |
| 32 | else ot(" .ltorg\n");\r |
| 33 | }\r |
| 34 | \r |
| 35 | #if CYCLONE_FOR_GENESIS\r |
| 36 | // r12=ptr to tas in table, trashes r0,r1\r |
| 37 | static void ChangeTAS(int norm)\r |
| 38 | {\r |
| 39 | ot(" ldr r0,=Op4ad0%s\n",norm?"_":"");\r |
| 40 | ot(" mov r1,#8\n");\r |
| 41 | ot("setrtas_loop%i0%s ;@ 4ad0-4ad7\n",norm,ms?"":":");\r |
| 42 | ot(" subs r1,r1,#1\n");\r |
| 43 | ot(" str r0,[r12],#4\n");\r |
| 44 | ot(" bne setrtas_loop%i0\n",norm);\r |
| 45 | ot(" ldr r0,=Op4ad8%s\n",norm?"_":"");\r |
| 46 | ot(" mov r1,#7\n");\r |
| 47 | ot("setrtas_loop%i1%s ;@ 4ad8-4ade\n",norm,ms?"":":");\r |
| 48 | ot(" subs r1,r1,#1\n");\r |
| 49 | ot(" str r0,[r12],#4\n");\r |
| 50 | ot(" bne setrtas_loop%i1\n",norm);\r |
| 51 | ot(" ldr r0,=Op4adf%s\n",norm?"_":"");\r |
| 52 | ot(" str r0,[r12],#4\n");\r |
| 53 | ot(" ldr r0,=Op4ae0%s\n",norm?"_":"");\r |
| 54 | ot(" mov r1,#7\n");\r |
| 55 | ot("setrtas_loop%i2%s ;@ 4ae0-4ae6\n",norm,ms?"":":");\r |
| 56 | ot(" subs r1,r1,#1\n");\r |
| 57 | ot(" str r0,[r12],#4\n");\r |
| 58 | ot(" bne setrtas_loop%i2\n",norm);\r |
| 59 | ot(" ldr r0,=Op4ae7%s\n",norm?"_":"");\r |
| 60 | ot(" str r0,[r12],#4\n");\r |
| 61 | ot(" ldr r0,=Op4ae8%s\n",norm?"_":"");\r |
| 62 | ot(" mov r1,#8\n");\r |
| 63 | ot("setrtas_loop%i3%s ;@ 4ae8-4aef\n",norm,ms?"":":");\r |
| 64 | ot(" subs r1,r1,#1\n");\r |
| 65 | ot(" str r0,[r12],#4\n");\r |
| 66 | ot(" bne setrtas_loop%i3\n",norm);\r |
| 67 | ot(" ldr r0,=Op4af0%s\n",norm?"_":"");\r |
| 68 | ot(" mov r1,#8\n");\r |
| 69 | ot("setrtas_loop%i4%s ;@ 4af0-4af7\n",norm,ms?"":":");\r |
| 70 | ot(" subs r1,r1,#1\n");\r |
| 71 | ot(" str r0,[r12],#4\n");\r |
| 72 | ot(" bne setrtas_loop%i4\n",norm);\r |
| 73 | ot(" ldr r0,=Op4af8%s\n",norm?"_":"");\r |
| 74 | ot(" str r0,[r12],#4\n");\r |
| 75 | ot(" ldr r0,=Op4af9%s\n",norm?"_":"");\r |
| 76 | ot(" str r0,[r12],#4\n");\r |
| 77 | }\r |
| 78 | #endif\r |
| 79 | \r |
| 80 | // trashes all temp regs\r |
| 81 | static void PrintException(int ints)\r |
| 82 | {\r |
| 83 | if(!ints) {\r |
| 84 | ot(" ;@ Cause an Exception - Vector address in r0\n");\r |
| 85 | ot(" mov r11,r0\n");\r |
| 86 | }\r |
| 87 | \r |
| 88 | ot(";@ swap OSP <-> A7?\n");\r |
| 89 | ot(" ldr r0,[r7,#0x44] ;@ Get SR high\n");\r |
| 90 | ot(" tst r0,#0x20\n");\r |
| 91 | ot(" bne no_sp_swap%i\n",ints);\r |
| 92 | ot(";@ swap OSP and A7:\n");\r |
| 93 | ot(" ldr r0,[r7,#0x3C] ;@ Get A7\n");\r |
| 94 | ot(" ldr r1,[r7,#0x48] ;@ Get OSP\n");\r |
| 95 | ot(" str r0,[r7,#0x48]\n");\r |
| 96 | ot(" str r1,[r7,#0x3C]\n");\r |
| 97 | ot("no_sp_swap%i%s\n",ints,ms?"":":");\r |
| 98 | \r |
| 99 | ot(" ldr r10,[r7,#0x60] ;@ Get Memory base\n");\r |
| 100 | ot(" mov r1,r4,lsl #8\n");\r |
| 101 | ot(" sub r1,r1,r10,lsl #8 ;@ r1 = Old PC\n");\r |
| 102 | ot(" mov r1,r1,asr #8 ;@ push sign extended\n");\r |
| 103 | OpPush32();\r |
| 104 | OpPushSr(1);\r |
| 105 | ot(" mov r0,r11\n");\r |
| 106 | ot(";@ Read IRQ Vector:\n");\r |
| 107 | MemHandler(0,2);\r |
| 108 | if(ints) {\r |
| 109 | ot(" tst r0,r0 ;@ uninitialized int vector?\n");\r |
| 110 | ot(" moveq r0,#0x3c\n");\r |
| 111 | ot(" moveq lr,pc\n");\r |
| 112 | ot(" ldreq pc,[r7,#0x70] ;@ Call read32(r0) handler\n");\r |
| 113 | }\r |
| 114 | #if USE_CHECKPC_CALLBACK\r |
| 115 | ot(" add r0,r0,r10 ;@ r0 = Memory Base + New PC\n");\r |
| 116 | ot(" mov lr,pc\n");\r |
| 117 | ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n");\r |
| 118 | ot(" mov r4,r0\n");\r |
| 119 | #endif\r |
| 120 | ot("\n");\r |
| 121 | \r |
| 122 | if(!ints) {\r |
| 123 | ot(" ldr r0,[r7,#0x44] ;@ Get SR high\n");\r |
| 124 | ot(" bic r0,r0,#0xd8 ;@ clear trace and unused flags\n");\r |
| 125 | ot(" orr r0,r0,#0x20 ;@ set supervisor mode\n");\r |
| 126 | ot(" strb r0,[r7,#0x44]\n");\r |
| 127 | }\r |
| 128 | }\r |
| 129 | \r |
| 130 | // Trashes r0,r1\r |
| 131 | void CheckInterrupt(int op)\r |
| 132 | {\r |
| 133 | ot(";@ CheckInterrupt:\n");\r |
| 134 | ot(" ldr r1,[r7,#0x44] ;@ Get SR high T_S__III and irq level\n");\r |
| 135 | ot(" movs r0,r1,lsr #24 ;@ Get IRQ level\n"); // same as ldrb r0,[r7,#0x47]\r |
| 136 | ot(" beq NoInts%x\n",op);\r |
| 137 | ot(" cmp r0,#6 ;@ irq>6 ?\n");\r |
| 138 | ot(" andle r1,r1,#7 ;@ Get interrupt mask\n");\r |
| 139 | ot(" cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n");\r |
| 140 | ot(" blgt CycloneDoInterrupt\n");\r |
| 141 | ot("NoInts%x%s\n", op,ms?"":":");\r |
| 142 | ot("\n");\r |
| 143 | }\r |
| 144 | \r |
| 145 | static void PrintFramework()\r |
| 146 | {\r |
| 147 | ot(";@ --------------------------- Framework --------------------------\n");\r |
| 148 | if (ms) ot("CycloneRun\n");\r |
| 149 | else ot("CycloneRun:\n");\r |
| 150 | \r |
| 151 | ot(" stmdb sp!,{r4-r11,lr}\n");\r |
| 152 | \r |
| 153 | ot(" mov r7,r0 ;@ r7 = Pointer to Cpu Context\n");\r |
| 154 | ot(" ;@ r0-3 = Temporary registers\n");\r |
| 155 | ot(" ldrb r9,[r7,#0x46] ;@ r9 = Flags (NZCV)\n");\r |
| 156 | ot(" ldr r6,=CycloneJumpTab ;@ r6 = Opcode Jump table\n");\r |
| 157 | ot(" ldr r5,[r7,#0x5c] ;@ r5 = Cycles\n");\r |
| 158 | ot(" ldr r4,[r7,#0x40] ;@ r4 = Current PC + Memory Base\n");\r |
| 159 | ot(" ;@ r8 = Current Opcode\n");\r |
| 160 | ot(" ldr r1,[r7,#0x44] ;@ Get SR high T_S__III and irq level\n");\r |
| 161 | ot(" mov r9,r9,lsl #28 ;@ r9 = Flags 0xf0000000, cpsr format\n");\r |
| 162 | ot(" ;@ r10 = Source value / Memory Base\n");\r |
| 163 | ot("\n");\r |
| 164 | ot(";@ CheckInterrupt:\n");\r |
| 165 | ot(" movs r0,r1,lsr #24 ;@ Get IRQ level\n"); // same as ldrb r0,[r7,#0x47]\r |
| 166 | ot(" beq NoInts0\n");\r |
| 167 | ot(" cmp r0,#6 ;@ irq>6 ?\n");\r |
| 168 | ot(" andle r1,r1,#7 ;@ Get interrupt mask\n");\r |
| 169 | ot(" cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n");\r |
| 170 | ot(" blgt CycloneDoInterrupt\n");\r |
| 171 | ot(";@ Check if interrupt used up all the cycles:\n");\r |
| 172 | ot(" subs r5,r5,#0\n");\r |
| 173 | ot(" blt CycloneEndNoBack\n");\r |
| 174 | ot("NoInts0%s\n", ms?"":":");\r |
| 175 | ot("\n");\r |
| 176 | ot(";@ Check if our processor is in stopped state and jump to opcode handler if not\n");\r |
| 177 | ot(" ldr r0,[r7,#0x58]\n");\r |
| 178 | ot(" ldrh r8,[r4],#2 ;@ Fetch first opcode\n");\r |
| 179 | ot(" tst r0,r0 ;@ stopped?\n");\r |
| 180 | ot(" bne CycloneStopped\n");\r |
| 181 | ot(" ldr pc,[r6,r8,asl #2] ;@ Jump to opcode handler\n");\r |
| 182 | ot("\n");\r |
| 183 | ot("\n");\r |
| 184 | \r |
| 185 | ot(";@ We come back here after execution\n");\r |
| 186 | ot("CycloneEnd%s\n", ms?"":":");\r |
| 187 | ot(" sub r4,r4,#2\n");\r |
| 188 | ot("CycloneEndNoBack%s\n", ms?"":":");\r |
| 189 | #ifdef CYCLONE_FOR_PICODRIVE\r |
| 190 | ot(" ldr r1,[r7,#0x54]\n");\r |
| 191 | ot(" mov r9,r9,lsr #28\n");\r |
| 192 | ot(" tst r1,r1\n");\r |
| 193 | ot(" bxne r1 ;@ jump to alternative CycloneEnd\n");\r |
| 194 | #else\r |
| 195 | ot(" mov r9,r9,lsr #28\n");\r |
| 196 | #endif\r |
| 197 | ot(" str r4,[r7,#0x40] ;@ Save Current PC + Memory Base\n");\r |
| 198 | ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r |
| 199 | ot(" strb r9,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r |
| 200 | ot(" ldmia sp!,{r4-r11,pc}\n");\r |
| 201 | ot("\n");\r |
| 202 | ot("CycloneStopped%s\n", ms?"":":");\r |
| 203 | ot(" mov r5,#0\n");\r |
| 204 | ot(" str r5,[r7,#0x5C] ;@ eat all cycles\n");\r |
| 205 | ot(" ldmia sp!,{r4-r11,pc} ;@ we are stopped, do nothing!\n");\r |
| 206 | ot("\n");\r |
| 207 | \r |
| 208 | ltorg();\r |
| 209 | \r |
| 210 | #if COMPRESS_JUMPTABLE\r |
| 211 | ot(";@ uncompress jump table\n");\r |
| 212 | if (ms) ot("CycloneInit\n");\r |
| 213 | else ot("CycloneInit:\n");\r |
| 214 | ot(" ldr r12,=CycloneJumpTab\n");\r |
| 215 | ot(" add r0,r12,#0xe000*4 ;@ ctrl code pointer\n");\r |
| 216 | ot(" ldr r1,[r0,#-4]\n");\r |
| 217 | ot(" tst r1,r1\n");\r |
| 218 | ot(" movne pc,lr ;@ already uncompressed\n");\r |
| 219 | ot(" add r3,r12,#0xa000*4 ;@ handler table pointer, r12=dest\n");\r |
| 220 | ot("unc_loop%s\n", ms?"":":");\r |
| 221 | ot(" ldrh r1,[r0],#2\n");\r |
| 222 | ot(" and r2,r1,#0xf\n");\r |
| 223 | ot(" bic r1,r1,#0xf\n");\r |
| 224 | ot(" ldr r1,[r3,r1,lsr #2] ;@ r1=handler\n");\r |
| 225 | ot(" cmp r2,#0xf\n");\r |
| 226 | ot(" addeq r2,r2,#1 ;@ 0xf is really 0x10\n");\r |
| 227 | ot(" tst r2,r2\n");\r |
| 228 | ot(" ldreqh r2,[r0],#2 ;@ counter is in next word\n");\r |
| 229 | ot(" tst r2,r2\n");\r |
| 230 | ot(" beq unc_finish ;@ done decompressing\n");\r |
| 231 | ot(" tst r1,r1\n");\r |
| 232 | ot(" addeq r12,r12,r2,lsl #2 ;@ 0 handler means we should skip those bytes\n");\r |
| 233 | ot(" beq unc_loop\n");\r |
| 234 | ot("unc_loop_in%s\n", ms?"":":");\r |
| 235 | ot(" subs r2,r2,#1\n");\r |
| 236 | ot(" str r1,[r12],#4\n");\r |
| 237 | ot(" bgt unc_loop_in\n");\r |
| 238 | ot(" b unc_loop\n");\r |
| 239 | ot("unc_finish%s\n", ms?"":":");\r |
| 240 | ot(" ldr r12,=CycloneJumpTab\n");\r |
| 241 | ot(" ;@ set a-line and f-line handlers\n");\r |
| 242 | ot(" add r0,r12,#0xa000*4\n");\r |
| 243 | ot(" ldr r1,[r0,#4] ;@ a-line handler\n");\r |
| 244 | ot(" ldr r3,[r0,#8] ;@ f-line handler\n");\r |
| 245 | ot(" mov r2,#0x1000\n");\r |
| 246 | ot("unc_fill3%s\n", ms?"":":");\r |
| 247 | ot(" subs r2,r2,#1\n");\r |
| 248 | ot(" str r1,[r0],#4\n");\r |
| 249 | ot(" bgt unc_fill3\n");\r |
| 250 | ot(" add r0,r12,#0xf000*4\n");\r |
| 251 | ot(" mov r2,#0x1000\n");\r |
| 252 | ot("unc_fill4%s\n", ms?"":":");\r |
| 253 | ot(" subs r2,r2,#1\n");\r |
| 254 | ot(" str r3,[r0],#4\n");\r |
| 255 | ot(" bgt unc_fill4\n");\r |
| 256 | ot(" bx lr\n");\r |
| 257 | ltorg();\r |
| 258 | ot("\n");\r |
| 259 | #else\r |
| 260 | ot(";@ do nothing\n");\r |
| 261 | if (ms) ot("CycloneInit\n");\r |
| 262 | else ot("CycloneInit:\n");\r |
| 263 | ot(" bx lr\n");\r |
| 264 | ot("\n");\r |
| 265 | #endif\r |
| 266 | if (ms) ot("CycloneSetSr\n");\r |
| 267 | else ot("CycloneSetSr:\n");\r |
| 268 | ot(" mov r2,r1,lsr #8\n");\r |
| 269 | ot(" ldrb r3,[r0,#0x44] ;@ get SR high\n");\r |
| 270 | ot(" eor r3,r3,r2\n");\r |
| 271 | ot(" tst r3,#0x20\n");\r |
| 272 | ot(" and r2,r2,#0xa7 ;@ only nonzero bits\n");\r |
| 273 | ot(" strb r2,[r0,#0x44] ;@ set SR high\n");\r |
| 274 | ot(" bne setsr_noswap\n");\r |
| 275 | ot(" ldr r2,[r0,#0x3C] ;@ Get A7\n");\r |
| 276 | ot(" ldr r3,[r0,#0x48] ;@ Get OSP\n");\r |
| 277 | ot(" str r3,[r0,#0x3C]\n");\r |
| 278 | ot(" str r2,[r0,#0x48]\n");\r |
| 279 | ot("setsr_noswap%s\n",ms?"":":");\r |
| 280 | ot(" mov r2,r1,lsr #3\n");\r |
| 281 | ot(" strb r2,[r0,#0x45] ;@ the X flag\n");\r |
| 282 | ot(" bic r2,r1,#0xf3\n");\r |
| 283 | ot(" tst r1,#1\n");\r |
| 284 | ot(" orrne r2,r2,#2\n");\r |
| 285 | ot(" tst r1,#2\n");\r |
| 286 | ot(" orrne r2,r2,#1\n");\r |
| 287 | ot(" strb r2,[r0,#0x46] ;@ flags\n");\r |
| 288 | ot(" bx lr\n");\r |
| 289 | ot("\n");\r |
| 290 | \r |
| 291 | if (ms) ot("CycloneGetSr\n");\r |
| 292 | else ot("CycloneGetSr:\n");\r |
| 293 | ot(" ldrb r1,[r0,#0x46] ;@ flags\n");\r |
| 294 | ot(" bic r2,r1,#0xf3\n");\r |
| 295 | ot(" tst r1,#1\n");\r |
| 296 | ot(" orrne r2,r2,#2\n");\r |
| 297 | ot(" tst r1,#2\n");\r |
| 298 | ot(" orrne r2,r2,#1\n");\r |
| 299 | ot(" ldrb r1,[r0,#0x45] ;@ the X flag\n");\r |
| 300 | ot(" tst r1,#2\n");\r |
| 301 | ot(" orrne r2,r2,#0x10\n");\r |
| 302 | ot(" ldrb r1,[r0,#0x44] ;@ the SR high\n");\r |
| 303 | ot(" orr r0,r2,r1,lsl #8\n");\r |
| 304 | ot(" bx lr\n");\r |
| 305 | ot("\n");\r |
| 306 | \r |
| 307 | if (ms) ot("CycloneSetRealTAS\n");\r |
| 308 | else ot("CycloneSetRealTAS:\n");\r |
| 309 | #if CYCLONE_FOR_GENESIS\r |
| 310 | ot(" ldr r12,=CycloneJumpTab\n");\r |
| 311 | ot(" tst r0,r0\n");\r |
| 312 | ot(" add r12,r12,#0x4a00*4\n");\r |
| 313 | ot(" add r12,r12,#0x00d0*4\n");\r |
| 314 | ot(" beq setrtas_off\n");\r |
| 315 | ChangeTAS(1);\r |
| 316 | ot(" bx lr\n");\r |
| 317 | ot("setrtas_off%s\n",ms?"":":");\r |
| 318 | ChangeTAS(0);\r |
| 319 | ot(" bx lr\n");\r |
| 320 | ltorg();\r |
| 321 | ot("\n");\r |
| 322 | #else\r |
| 323 | ot(" bx lr\n");\r |
| 324 | ot("\n");\r |
| 325 | #endif\r |
| 326 | \r |
| 327 | ot(";@ DoInterrupt - r0=IRQ number\n");\r |
| 328 | ot("CycloneDoInterrupt%s\n", ms?"":":");\r |
| 329 | ot(" stmdb sp!,{lr} ;@ Push ARM return address\n");\r |
| 330 | \r |
| 331 | ot(";@ Get IRQ Vector address:\n");\r |
| 332 | ot(" mov r0,r0,asl #2\n");\r |
| 333 | ot(" add r11,r0,#0x60\n");\r |
| 334 | PrintException(1);\r |
| 335 | \r |
| 336 | ot(" ldrb r0,[r7,#0x47] ;@ IRQ\n");\r |
| 337 | ot(" mov r2,#0\n");\r |
| 338 | ot(" orr r1,r0,#0x20 ;@ Supervisor mode + IRQ number\n");\r |
| 339 | ot(" strb r1,[r7,#0x44] ;@ Put SR high\n");\r |
| 340 | \r |
| 341 | ot(";@ Clear stopped states:\n");\r |
| 342 | ot(" str r2,[r7,#0x58]\n");\r |
| 343 | ot(" sub r5,r5,#%d ;@ Subtract cycles\n",44);\r |
| 344 | ot("\n");\r |
| 345 | #if USE_INT_ACK_CALLBACK\r |
| 346 | #if INT_ACK_NEEDS_STUFF\r |
| 347 | ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r |
| 348 | ot(" mov r1,r9,lsr #28\n");\r |
| 349 | ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r |
| 350 | ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r |
| 351 | #endif\r |
| 352 | ot(" ldr r11,[r7,#0x8c] ;@ IrqCallback\n");\r |
| 353 | ot(" tst r11,r11\n");\r |
| 354 | ot(" movne lr,pc\n");\r |
| 355 | ot(" movne pc,r11 ;@ call IrqCallback if it is defined\n");\r |
| 356 | #if INT_ACK_CHANGES_STUFF\r |
| 357 | ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r |
| 358 | ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r |
| 359 | ot(" mov r9,r9,lsl #28\n");\r |
| 360 | ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r |
| 361 | #endif\r |
| 362 | #else // not USE_INT_ACK_CALLBACK\r |
| 363 | ot(";@ Clear irq:\n");\r |
| 364 | ot(" strb r1,[r7,#0x47]\n");\r |
| 365 | #endif\r |
| 366 | ot(" ldmia sp!,{pc} ;@ Return\n");\r |
| 367 | ot("\n");\r |
| 368 | \r |
| 369 | ot("Exception%s\n", ms?"":":");\r |
| 370 | ot("\n");\r |
| 371 | ot(" stmdb sp!,{lr} ;@ Preserve ARM return address\n");\r |
| 372 | PrintException(0);\r |
| 373 | ot(" ldmia sp!,{pc} ;@ Return\n");\r |
| 374 | ot("\n");\r |
| 375 | }\r |
| 376 | \r |
| 377 | // ---------------------------------------------------------------------------\r |
| 378 | // Call Read(r0), Write(r0,r1) or Fetch(r0)\r |
| 379 | // Trashes r0-r3,r12,lr\r |
| 380 | int MemHandler(int type,int size)\r |
| 381 | {\r |
| 382 | int func=0;\r |
| 383 | func=0x68+type*0xc+(size<<2); // Find correct offset\r |
| 384 | \r |
| 385 | #if MEMHANDLERS_NEED_PC\r |
| 386 | ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r |
| 387 | #endif\r |
| 388 | #if MEMHANDLERS_NEED_FLAGS\r |
| 389 | ot(" mov r3,r9,lsr #28\n");\r |
| 390 | ot(" strb r3,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r |
| 391 | #endif\r |
| 392 | #if MEMHANDLERS_NEED_CYCLES\r |
| 393 | ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r |
| 394 | #endif\r |
| 395 | \r |
| 396 | ot(" mov lr,pc\n");\r |
| 397 | ot(" ldr pc,[r7,#0x%x] ;@ Call ",func);\r |
| 398 | \r |
| 399 | // Document what we are calling:\r |
| 400 | if (type==0) ot("read");\r |
| 401 | if (type==1) ot("write");\r |
| 402 | if (type==2) ot("fetch");\r |
| 403 | \r |
| 404 | if (type==1) ot("%d(r0,r1)",8<<size);\r |
| 405 | else ot("%d(r0)", 8<<size);\r |
| 406 | ot(" handler\n");\r |
| 407 | \r |
| 408 | #if MEMHANDLERS_CHANGE_CYCLES\r |
| 409 | ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r |
| 410 | #endif\r |
| 411 | #if MEMHANDLERS_CHANGE_FLAGS\r |
| 412 | ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r |
| 413 | ot(" mov r9,r9,lsl #28\n");\r |
| 414 | #endif\r |
| 415 | #if MEMHANDLERS_CHANGE_PC\r |
| 416 | ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r |
| 417 | #endif\r |
| 418 | \r |
| 419 | return 0;\r |
| 420 | }\r |
| 421 | \r |
| 422 | static void PrintOpcodes()\r |
| 423 | {\r |
| 424 | int op=0;\r |
| 425 | \r |
| 426 | printf("Creating Opcodes: [");\r |
| 427 | \r |
| 428 | ot(";@ ---------------------------- Opcodes ---------------------------\n");\r |
| 429 | \r |
| 430 | // Emit null opcode:\r |
| 431 | ot("Op____%s ;@ Called if an opcode is not recognised\n", ms?"":":");\r |
| 432 | ot(" sub r4,r4,#2\n");\r |
| 433 | #if USE_UNRECOGNIZED_CALLBACK\r |
| 434 | ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r |
| 435 | ot(" mov r1,r9,lsr #28\n");\r |
| 436 | ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r |
| 437 | ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r |
| 438 | ot(" ldr r11,[r7,#0x94] ;@ UnrecognizedCallback\n");\r |
| 439 | ot(" tst r11,r11\n");\r |
| 440 | ot(" movne lr,pc\n");\r |
| 441 | ot(" movne pc,r11 ;@ call UnrecognizedCallback if it is defined\n");\r |
| 442 | ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r |
| 443 | ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r |
| 444 | ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r |
| 445 | ot(" mov r9,r9,lsl #28\n");\r |
| 446 | ot(" tst r0,r0\n");\r |
| 447 | ot(" moveq r0,#0x10\n");\r |
| 448 | ot(" bleq Exception\n");\r |
| 449 | #else\r |
| 450 | ot(" mov r0,#0x10\n");\r |
| 451 | ot(" bl Exception\n");\r |
| 452 | #endif\r |
| 453 | Cycles=34;\r |
| 454 | OpEnd();\r |
| 455 | \r |
| 456 | // Unrecognised a-line and f-line opcodes throw an exception:\r |
| 457 | ot("Op__al%s ;@ Unrecognised a-line opcode\n", ms?"":":");\r |
| 458 | ot(" sub r4,r4,#2\n");\r |
| 459 | #if USE_AFLINE_CALLBACK\r |
| 460 | ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r |
| 461 | ot(" mov r1,r9,lsr #28\n");\r |
| 462 | ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r |
| 463 | ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r |
| 464 | ot(" ldr r11,[r7,#0x94] ;@ UnrecognizedCallback\n");\r |
| 465 | ot(" tst r11,r11\n");\r |
| 466 | ot(" movne lr,pc\n");\r |
| 467 | ot(" movne pc,r11 ;@ call UnrecognizedCallback if it is defined\n");\r |
| 468 | ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r |
| 469 | ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r |
| 470 | ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r |
| 471 | ot(" mov r9,r9,lsl #28\n");\r |
| 472 | ot(" tst r0,r0\n");\r |
| 473 | ot(" moveq r0,#0x28\n");\r |
| 474 | ot(" bleq Exception\n");\r |
| 475 | #else\r |
| 476 | ot(" mov r0,#0x28\n");\r |
| 477 | ot(" bl Exception\n");\r |
| 478 | #endif\r |
| 479 | Cycles=4;\r |
| 480 | OpEnd();\r |
| 481 | \r |
| 482 | ot("Op__fl%s ;@ Unrecognised f-line opcode\n", ms?"":":");\r |
| 483 | ot(" sub r4,r4,#2\n");\r |
| 484 | #if USE_AFLINE_CALLBACK\r |
| 485 | ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r |
| 486 | ot(" mov r1,r9,lsr #28\n");\r |
| 487 | ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r |
| 488 | ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r |
| 489 | ot(" ldr r11,[r7,#0x94] ;@ UnrecognizedCallback\n");\r |
| 490 | ot(" tst r11,r11\n");\r |
| 491 | ot(" movne lr,pc\n");\r |
| 492 | ot(" movne pc,r11 ;@ call UnrecognizedCallback if it is defined\n");\r |
| 493 | ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r |
| 494 | ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r |
| 495 | ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r |
| 496 | ot(" mov r9,r9,lsl #28\n");\r |
| 497 | ot(" tst r0,r0\n");\r |
| 498 | ot(" moveq r0,#0x2c\n");\r |
| 499 | ot(" bleq Exception\n");\r |
| 500 | #else\r |
| 501 | ot(" mov r0,#0x2c\n");\r |
| 502 | ot(" bl Exception\n");\r |
| 503 | #endif\r |
| 504 | Cycles=4;\r |
| 505 | OpEnd();\r |
| 506 | \r |
| 507 | \r |
| 508 | for (op=0;op<0x10000;op++)\r |
| 509 | {\r |
| 510 | if ((op&0xfff)==0) { printf("%x",op>>12); fflush(stdout); } // Update progress\r |
| 511 | \r |
| 512 | OpAny(op);\r |
| 513 | }\r |
| 514 | \r |
| 515 | ot("\n");\r |
| 516 | \r |
| 517 | printf("]\n");\r |
| 518 | }\r |
| 519 | \r |
| 520 | // helper\r |
| 521 | static void ott(const char *str, int par, const char *nl, int nlp, int counter, int size)\r |
| 522 | {\r |
| 523 | switch(size) {\r |
| 524 | case 0: if((counter&7)==0) ot(ms?" dcb ":" .byte "); break;\r |
| 525 | case 1: if((counter&7)==0) ot(ms?" dcw ":" .hword "); break;\r |
| 526 | case 2: if((counter&7)==0) ot(ms?" dcd ":" .long "); break;\r |
| 527 | }\r |
| 528 | ot(str, par);\r |
| 529 | if((counter&7)==7) ot(nl,nlp); else ot(",");\r |
| 530 | }\r |
| 531 | \r |
| 532 | static void PrintJumpTable()\r |
| 533 | {\r |
| 534 | int i=0,op=0,len=0;\r |
| 535 | \r |
| 536 | ot(";@ -------------------------- Jump Table --------------------------\n");\r |
| 537 | \r |
| 538 | // space for decompressed table\r |
| 539 | ot(ms?" area |.data|, data\n":" .data\n .align 4\n\n");\r |
| 540 | \r |
| 541 | #if COMPRESS_JUMPTABLE\r |
| 542 | int handlers=0,reps=0,*indexes,ip,u,out;\r |
| 543 | // use some weird compression on the jump table\r |
| 544 | indexes=(int *)malloc(0x10000*4);\r |
| 545 | if(!indexes) { printf("ERROR: out of memory\n"); exit(1); }\r |
| 546 | len=0x10000;\r |
| 547 | \r |
| 548 | ot("CycloneJumpTab%s\n", ms?"":":");\r |
| 549 | if(ms) {\r |
| 550 | for(i = 0; i < 0xa000/8; i++)\r |
| 551 | ot(" dcd 0,0,0,0,0,0,0,0\n");\r |
| 552 | } else\r |
| 553 | ot(" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", 0xa000/8);\r |
| 554 | \r |
| 555 | // hanlers live in "a-line" part of the table\r |
| 556 | // first output nop,a-line,f-line handlers\r |
| 557 | ot(ms?" dcd Op____,Op__al,Op__fl,":" .long Op____,Op__al,Op__fl,");\r |
| 558 | handlers=3;\r |
| 559 | \r |
| 560 | for(i=0;i<len;i++)\r |
| 561 | {\r |
| 562 | op=CyJump[i];\r |
| 563 | \r |
| 564 | for(u=i-1; u>=0; u--) if(op == CyJump[u]) break; // already done with this op?\r |
| 565 | if(u==-1 && op >= 0) {\r |
| 566 | ott("Op%.4x",op," ;@ %.4x\n",i,handlers,2);\r |
| 567 | indexes[op] = handlers;\r |
| 568 | handlers++;\r |
| 569 | }\r |
| 570 | }\r |
| 571 | if(handlers&7) {\r |
| 572 | fseek(AsmFile, -1, SEEK_CUR); // remove last comma\r |
| 573 | for(i = 8-(handlers&7); i > 0; i--)\r |
| 574 | ot(",000000");\r |
| 575 | ot("\n");\r |
| 576 | }\r |
| 577 | if(ms) {\r |
| 578 | for(i = (0x4000-handlers)/8; i > 0; i--)\r |
| 579 | ot(" dcd 0,0,0,0,0,0,0,0\n");\r |
| 580 | } else {\r |
| 581 | ot(ms?"":" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", (0x4000-handlers)/8);\r |
| 582 | }\r |
| 583 | printf("total distinct hanlers: %i\n",handlers);\r |
| 584 | // output data\r |
| 585 | for(i=0,ip=0; i < 0xf000; i++, ip++) {\r |
| 586 | op=CyJump[i];\r |
| 587 | if(op == -2) {\r |
| 588 | // it must skip a-line area, because we keep our data there\r |
| 589 | ott("0x%.4x", handlers<<4, "\n",0,ip++,1);\r |
| 590 | ott("0x%.4x", 0x1000, "\n",0,ip,1);\r |
| 591 | i+=0xfff;\r |
| 592 | continue;\r |
| 593 | }\r |
| 594 | for(reps=1; i < 0xf000; i++, reps++) if(op != CyJump[i+1]) break;\r |
| 595 | if(op>=0) out=indexes[op]<<4; else out=0; // unrecognised\r |
| 596 | if(reps <= 0xe || reps==0x10) {\r |
| 597 | if(reps!=0x10) out|=reps; else out|=0xf; // 0xf means 0x10 (0xf appeared to be unused anyway)\r |
| 598 | ott("0x%.4x", out, "\n",0,ip,1);\r |
| 599 | } else {\r |
| 600 | ott("0x%.4x", out, "\n",0,ip++,1);\r |
| 601 | ott("0x%.4x", reps,"\n",0,ip,1);\r |
| 602 | }\r |
| 603 | }\r |
| 604 | if(ip&1) ott("0x%.4x", 0, "\n",0,ip++,1);\r |
| 605 | if(ip&7) fseek(AsmFile, -1, SEEK_CUR); // remove last comma\r |
| 606 | ot("\n");\r |
| 607 | if(ip&7) {\r |
| 608 | for(i = 8-(ip&7); i > 0; i--)\r |
| 609 | ot(",0x0000");\r |
| 610 | ot("\n");\r |
| 611 | }\r |
| 612 | if(ms) {\r |
| 613 | for(i = (0x2000-ip/2)/8+1; i > 0; i--)\r |
| 614 | ot(" dcd 0,0,0,0,0,0,0,0\n");\r |
| 615 | } else {\r |
| 616 | ot(" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", (0x2000-ip/2)/8+1);\r |
| 617 | }\r |
| 618 | ot("\n");\r |
| 619 | free(indexes);\r |
| 620 | #else\r |
| 621 | ot("CycloneJumpTab%s\n", ms?"":":");\r |
| 622 | len=0xfffe; // Hmmm, armasm 2.50.8684 messes up with a 0x10000 long jump table\r |
| 623 | // notaz: same thing with GNU as 2.9-psion-98r2 (reloc overflow)\r |
| 624 | // this is due to COFF objects using only 2 bytes for reloc count\r |
| 625 | \r |
| 626 | for (i=0;i<len;i++)\r |
| 627 | {\r |
| 628 | op=CyJump[i];\r |
| 629 | \r |
| 630 | if(op>=0) ott("Op%.4x",op," ;@ %.4x\n",i-7,i,2);\r |
| 631 | else if(op==-2) ott("Op__al",0, " ;@ %.4x\n",i-7,i,2);\r |
| 632 | else if(op==-3) ott("Op__fl",0, " ;@ %.4x\n",i-7,i,2);\r |
| 633 | else ott("Op____",0, " ;@ %.4x\n",i-7,i,2);\r |
| 634 | }\r |
| 635 | if(i&7) fseek(AsmFile, -1, SEEK_CUR); // remove last comma\r |
| 636 | \r |
| 637 | ot("\n");\r |
| 638 | ot(";@ notaz: we don't want to crash if we run into those 2 missing opcodes\n");\r |
| 639 | ot(";@ so we leave this pattern to patch it later\n");\r |
| 640 | ot("%s 0x78563412\n", ms?" dcd":" .long");\r |
| 641 | ot("%s 0x56341290\n", ms?" dcd":" .long");\r |
| 642 | #endif\r |
| 643 | }\r |
| 644 | \r |
| 645 | static int CycloneMake()\r |
| 646 | {\r |
| 647 | int i;\r |
| 648 | char *name="Cyclone.s";\r |
| 649 | \r |
| 650 | // Open the assembly file\r |
| 651 | if (ms) name="Cyclone.asm";\r |
| 652 | AsmFile=fopen(name,"wt"); if (AsmFile==NULL) return 1;\r |
| 653 | \r |
| 654 | printf("Making %s...\n",name);\r |
| 655 | \r |
| 656 | ot("\n;@ Dave's Cyclone 68000 Emulator v%x.%.3x - Assembler Output\n\n",CycloneVer>>12,CycloneVer&0xfff);\r |
| 657 | \r |
| 658 | ot(";@ (c) Copyright 2003 Dave, All rights reserved.\n");\r |
| 659 | ot(";@ some code (c) Copyright 2005-2006 notaz, All rights reserved.\n");\r |
| 660 | ot(";@ Cyclone 68000 is free for non-commercial use.\n\n");\r |
| 661 | ot(";@ For commercial use, separate licencing terms must be obtained.\n\n");\r |
| 662 | \r |
| 663 | CyJump=(int *)malloc(0x40000); if (CyJump==NULL) return 1;\r |
| 664 | memset(CyJump,0xff,0x40000); // Init to -1\r |
| 665 | for(i=0xa000; i<0xb000; i++) CyJump[i] = -2; // a-line emulation\r |
| 666 | for(i=0xf000; i<0x10000; i++) CyJump[i] = -3; // f-line emulation\r |
| 667 | \r |
| 668 | if (ms)\r |
| 669 | {\r |
| 670 | ot(" area |.text|, code\n");\r |
| 671 | ot(" export CycloneInit\n");\r |
| 672 | ot(" export CycloneRun\n");\r |
| 673 | ot(" export CycloneSetSr\n");\r |
| 674 | ot(" export CycloneGetSr\n");\r |
| 675 | ot(" export CycloneSetRealTAS\n");\r |
| 676 | ot(" export CycloneVer\n");\r |
| 677 | ot("\n");\r |
| 678 | ot("CycloneVer dcd 0x%.4x\n",CycloneVer);\r |
| 679 | }\r |
| 680 | else\r |
| 681 | {\r |
| 682 | ot(" .global CycloneInit\n");\r |
| 683 | ot(" .global CycloneRun\n");\r |
| 684 | ot(" .global CycloneSetSr\n");\r |
| 685 | ot(" .global CycloneGetSr\n");\r |
| 686 | ot(" .global CycloneSetRealTAS\n");\r |
| 687 | ot(" .global CycloneVer\n");\r |
| 688 | #ifdef CYCLONE_FOR_PICODRIVE\r |
| 689 | ot(" .global CycloneDoInterrupt\n");\r |
| 690 | ot(" .global CycloneJumpTab\n");\r |
| 691 | #endif\r |
| 692 | ot("CycloneVer: .long 0x%.4x\n",CycloneVer);\r |
| 693 | }\r |
| 694 | ot("\n");\r |
| 695 | \r |
| 696 | PrintFramework();\r |
| 697 | PrintOpcodes();\r |
| 698 | PrintJumpTable();\r |
| 699 | \r |
| 700 | if (ms) ot(" END\n");\r |
| 701 | \r |
| 702 | ot("\n\n;@ vim:filetype=armasm\n");\r |
| 703 | \r |
| 704 | fclose(AsmFile); AsmFile=NULL;\r |
| 705 | \r |
| 706 | #if 0\r |
| 707 | printf("Assembling...\n");\r |
| 708 | // Assemble the file\r |
| 709 | if (ms) system("armasm Cyclone.asm");\r |
| 710 | else system("as -o Cyclone.o Cyclone.s");\r |
| 711 | printf("Done!\n\n");\r |
| 712 | #endif\r |
| 713 | \r |
| 714 | free(CyJump);\r |
| 715 | return 0;\r |
| 716 | }\r |
| 717 | \r |
| 718 | int main()\r |
| 719 | {\r |
| 720 | printf("\n Dave's Cyclone 68000 Emulator v%x.%.3x - Core Creator\n\n",CycloneVer>>12,CycloneVer&0xfff);\r |
| 721 | \r |
| 722 | // Make GAS or ARMASM version\r |
| 723 | CycloneMake();\r |
| 724 | return 0;\r |
| 725 | }\r |
| 726 | \r |