| 1 | \r |
| 2 | // This file is part of the Cyclone 68000 Emulator\r |
| 3 | \r |
| 4 | // Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\r |
| 5 | \r |
| 6 | // This code is licensed under the GNU General Public License version 2.0 and the MAME License.\r |
| 7 | // You can choose the license that has the most advantages for you.\r |
| 8 | \r |
| 9 | // SVN repository can be found at http://code.google.com/p/cyclone68000/\r |
| 10 | \r |
| 11 | #include "app.h"\r |
| 12 | \r |
| 13 | static FILE *AsmFile=NULL;\r |
| 14 | \r |
| 15 | static int CycloneVer=0x0069; // Version number of library\r |
| 16 | int *CyJump=NULL; // Jump table\r |
| 17 | int ms=0; // If non-zero, output in Microsoft ARMASM format\r |
| 18 | char *Narm[4]={ "b", "h","",""}; // Normal ARM Extensions for operand sizes 0,1,2\r |
| 19 | char *Sarm[4]={"sb","sh","",""}; // Sign-extend ARM Extensions for operand sizes 0,1,2\r |
| 20 | int Cycles=0; // Current cycles for opcode\r |
| 21 | int Amatch=1; // If one, try to match A68K timing\r |
| 22 | int Accu=-1; // Accuracy\r |
| 23 | int Debug=0; // Debug info\r |
| 24 | \r |
| 25 | void ot(char *format, ...)\r |
| 26 | {\r |
| 27 | va_list valist=NULL;\r |
| 28 | va_start(valist,format);\r |
| 29 | if (AsmFile) vfprintf(AsmFile,format,valist);\r |
| 30 | va_end(valist);\r |
| 31 | }\r |
| 32 | \r |
| 33 | void ltorg()\r |
| 34 | {\r |
| 35 | if (ms) ot(" LTORG\n");\r |
| 36 | else ot(" .ltorg\n");\r |
| 37 | }\r |
| 38 | \r |
| 39 | static void PrintException()\r |
| 40 | {\r |
| 41 | ot(" ;@ Cause an Exception - Vector in [r7,#0x50]\n");\r |
| 42 | ot(" ldr r10,[r7,#0x60] ;@ Get Memory base\n");\r |
| 43 | ot(" sub r1,r4,r10 ;@ r1 = Old PC\n");\r |
| 44 | OpPush32();\r |
| 45 | OpPushSr(1);\r |
| 46 | ot(" ldr r0,[r7,#0x50] ;@ Get Vector\n");\r |
| 47 | ot(";@ Read IRQ Vector:\n");\r |
| 48 | MemHandler(0,2);\r |
| 49 | ot(" add r0,r0,r10 ;@ r0 = Memory Base + New PC\n");\r |
| 50 | ot(" mov lr,pc\n");\r |
| 51 | ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n");\r |
| 52 | ot(" mov r4,r0\n");\r |
| 53 | ot("\n");\r |
| 54 | \r |
| 55 | // todo - make Interrupt code use this function as well\r |
| 56 | }\r |
| 57 | \r |
| 58 | // Trashes r0\r |
| 59 | void CheckInterrupt()\r |
| 60 | {\r |
| 61 | ot(";@ CheckInterrupt:\n");\r |
| 62 | ot(" ldrb r0,[r7,#0x47] ;@ Get IRQ level\n");\r |
| 63 | ot(" tst r0,r0\n");\r |
| 64 | ot(" blne DoInterrupt\n");\r |
| 65 | ot("\n");\r |
| 66 | }\r |
| 67 | \r |
| 68 | static void PrintFramework()\r |
| 69 | {\r |
| 70 | ot(";@ --------------------------- Framework --------------------------\n");\r |
| 71 | if (ms) ot("CycloneRun\n");\r |
| 72 | else ot("CycloneRun:\n");\r |
| 73 | \r |
| 74 | ot(" stmdb sp!,{r4-r11,lr}\n");\r |
| 75 | \r |
| 76 | ot(" mov r7,r0 ;@ r7 = Pointer to Cpu Context\n");\r |
| 77 | ot(" ;@ r0-3 = Temporary registers\n");\r |
| 78 | ot(" ldrb r9,[r7,#0x46] ;@ r9 = Flags (NZCV)\n");\r |
| 79 | ot(" ldr r6,=JumpTab ;@ r6 = Opcode Jump table\n");\r |
| 80 | ot(" ldr r5,[r7,#0x5c] ;@ r5 = Cycles\n");\r |
| 81 | ot(" ldr r4,[r7,#0x40] ;@ r4 = Current PC + Memory Base\n");\r |
| 82 | ot(" ;@ r8 = Current Opcode\n");\r |
| 83 | ot(" mov r9,r9,lsl #28 ;@ r9 = Flags 0xf0000000, cpsr format\n");\r |
| 84 | ot(" ;@ r10 = Source value / Memory Base\n");\r |
| 85 | ot("\n");\r |
| 86 | CheckInterrupt();\r |
| 87 | ot(";@ Check if interrupt used up all the cycles:\n");\r |
| 88 | ot(" subs r5,r5,#0\n");\r |
| 89 | ot(" blt CycloneEndNoBack\n");\r |
| 90 | \r |
| 91 | OpFirst();\r |
| 92 | ltorg();\r |
| 93 | ot("\n");\r |
| 94 | \r |
| 95 | ot(";@ We come back here after execution\n");\r |
| 96 | ot("CycloneEnd%s\n", ms?"":":");\r |
| 97 | ot(" sub r4,r4,#2\n");\r |
| 98 | ot("CycloneEndNoBack%s\n", ms?"":":");\r |
| 99 | ot(" mov r9,r9,lsr #28\n");\r |
| 100 | ot(" str r4,[r7,#0x40] ;@ Save Current PC + Memory Base\n");\r |
| 101 | ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r |
| 102 | ot(" strb r9,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r |
| 103 | ot(" ldmia sp!,{r4-r11,pc}\n");\r |
| 104 | ot("\n");\r |
| 105 | \r |
| 106 | ot(";@ DoInterrupt - r0=IRQ number\n");\r |
| 107 | ot("DoInterrupt%s\n", ms?"":":");\r |
| 108 | ot("\n");\r |
| 109 | ot(" ldrb r1,[r7,#0x44] ;@ Get SR high: T_S__III\n");\r |
| 110 | ot(" and r1,r1,#7 ;@ Get interrupt mask\n");\r |
| 111 | ot(" cmp r0,#6 ;@ irq>6 ?\n");\r |
| 112 | ot(" cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n");\r |
| 113 | ot(" movle pc,lr ;@ irq<=6 and mask, not allowed\n");\r |
| 114 | ot("\n");\r |
| 115 | ot(" ldr r10,[r7,#0x60] ;@ Get Memory base\n");\r |
| 116 | ot(" mov r11,lr ;@ Preserve ARM return address\n");\r |
| 117 | ot(" sub r1,r4,r10 ;@ r1 = Old PC\n");\r |
| 118 | OpPush32();\r |
| 119 | OpPushSr(1);\r |
| 120 | ot(";@ Get IRQ Vector address:\n");\r |
| 121 | ot(" ldrb r1,[r7,#0x47] ;@ IRQ\n");\r |
| 122 | ot(" mov r0,r1,asl #2\n");\r |
| 123 | ot(" add r0,r0,#0x60\n");\r |
| 124 | ot(";@ Read IRQ Vector:\n");\r |
| 125 | MemHandler(0,2);\r |
| 126 | ot(" add r0,r0,r10 ;@ r0 = Memory Base + New PC\n");\r |
| 127 | ot(" mov lr,pc\n");\r |
| 128 | ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n");\r |
| 129 | ot(" mov r4,r0\n");\r |
| 130 | ot("\n");\r |
| 131 | ot(";@ todo - swap OSP and A7 if not in Supervisor mode\n");\r |
| 132 | ot(" ldrb r0,[r7,#0x47] ;@ IRQ\n");\r |
| 133 | ot(" orr r0,r0,#0x20 ;@ Supervisor mode + IRQ number\n");\r |
| 134 | ot(" strb r0,[r7,#0x44] ;@ Put SR high\n");\r |
| 135 | ot("\n");\r |
| 136 | ot(";@ Clear irq:\n");\r |
| 137 | ot(" mov r0,#0\n");\r |
| 138 | ot(" strb r0,[r7,#0x47]\n");\r |
| 139 | ot(" subs r5,r5,#%d ;@ Subtract cycles\n",46);\r |
| 140 | ot(" mov pc,r11 ;@ Return\n");\r |
| 141 | ot("\n");\r |
| 142 | \r |
| 143 | ot("Exception%s\n", ms?"":":");\r |
| 144 | ot("\n");\r |
| 145 | ot(" mov r11,lr ;@ Preserve ARM return address\n");\r |
| 146 | PrintException();\r |
| 147 | ot(" mov pc,r11 ;@ Return\n");\r |
| 148 | ot("\n");\r |
| 149 | }\r |
| 150 | \r |
| 151 | // ---------------------------------------------------------------------------\r |
| 152 | // Call Read(r0), Write(r0,r1) or Fetch(r0)\r |
| 153 | // Trashes r0-r3\r |
| 154 | int MemHandler(int type,int size)\r |
| 155 | {\r |
| 156 | int func=0;\r |
| 157 | func=0x68+type*0xc+(size<<2); // Find correct offset\r |
| 158 | \r |
| 159 | if (Debug&4) ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r |
| 160 | if (Debug&3) ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r |
| 161 | \r |
| 162 | ot(" mov lr,pc\n");\r |
| 163 | ot(" ldr pc,[r7,#0x%x] ;@ Call ",func);\r |
| 164 | \r |
| 165 | // Document what we are calling:\r |
| 166 | if (type==0) ot("read");\r |
| 167 | if (type==1) ot("write");\r |
| 168 | if (type==2) ot("fetch");\r |
| 169 | \r |
| 170 | if (type==1) ot("%d(r0,r1)",8<<size);\r |
| 171 | else ot("%d(r0)", 8<<size);\r |
| 172 | ot(" handler\n");\r |
| 173 | \r |
| 174 | if (Debug&2) ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r |
| 175 | return 0;\r |
| 176 | }\r |
| 177 | \r |
| 178 | static void PrintOpcodes()\r |
| 179 | {\r |
| 180 | int op=0;\r |
| 181 | \r |
| 182 | printf("Creating Opcodes: [");\r |
| 183 | \r |
| 184 | ot(";@ ---------------------------- Opcodes ---------------------------\n");\r |
| 185 | \r |
| 186 | // Emit null opcode:\r |
| 187 | ot("Op____%s ;@ Called if an opcode is not recognised\n", ms?"":":");\r |
| 188 | OpStart(-1); Cycles=4; OpEnd(); //test\r |
| 189 | \r |
| 190 | ot(" b CycloneEnd\n\n");\r |
| 191 | \r |
| 192 | for (op=0;op<0x10000;op++)\r |
| 193 | {\r |
| 194 | if ((op&0xfff)==0) { printf("%x",op>>12); fflush(stdout); } // Update progress\r |
| 195 | \r |
| 196 | OpAny(op);\r |
| 197 | }\r |
| 198 | \r |
| 199 | ot("\n");\r |
| 200 | \r |
| 201 | printf("]\n");\r |
| 202 | }\r |
| 203 | \r |
| 204 | static void PrintJumpTable()\r |
| 205 | {\r |
| 206 | int i=0,op=0,len=0;\r |
| 207 | \r |
| 208 | ot(";@ -------------------------- Jump Table --------------------------\n");\r |
| 209 | ot("JumpTab%s\n", ms?"":":");\r |
| 210 | \r |
| 211 | len=0xfffe; // Hmmm, armasm 2.50.8684 messes up with a 0x10000 long jump table\r |
| 212 | for (i=0;i<len;i++)\r |
| 213 | {\r |
| 214 | op=CyJump[i];\r |
| 215 | \r |
| 216 | if ((i&7)==0) ot(ms?" dcd ":" .long ");\r |
| 217 | if (op<0) ot("Op____"); else ot("Op%.4x",op);\r |
| 218 | \r |
| 219 | if ((i&7)==7) ot(" ;@ %.4x\n",i-7);\r |
| 220 | else if (i+1<len) ot(",");\r |
| 221 | }\r |
| 222 | \r |
| 223 | ot("\n");\r |
| 224 | }\r |
| 225 | \r |
| 226 | static int CycloneMake()\r |
| 227 | {\r |
| 228 | char *name="Cyclone.s";\r |
| 229 | \r |
| 230 | // Open the assembly file\r |
| 231 | if (ms) name="Cyclone.asm";\r |
| 232 | AsmFile=fopen(name,"wt"); if (AsmFile==NULL) return 1;\r |
| 233 | \r |
| 234 | printf("Making %s...\n",name);\r |
| 235 | \r |
| 236 | ot("\n;@ Cyclone 68000 Emulator v%x.%.3x - Assembler Output\n\n",CycloneVer>>12,CycloneVer&0xfff);\r |
| 237 | \r |
| 238 | ot(";@ Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\n\n");\r |
| 239 | \r |
| 240 | ot(";@ This code is licensed under the GNU General Public License version 2.0 and the MAME License.\n");\r |
| 241 | ot(";@ You can choose the license that has the most advantages for you.\n\n");\r |
| 242 | ot(";@ SVN repository can be found at http://code.google.com/p/cyclone68000/\n\n");\r |
| 243 | \r |
| 244 | CyJump=(int *)malloc(0x40000); if (CyJump==NULL) return 1;\r |
| 245 | memset(CyJump,0xff,0x40000); // Init to -1\r |
| 246 | \r |
| 247 | if (ms)\r |
| 248 | {\r |
| 249 | ot(" area |.text|, code\n");\r |
| 250 | ot(" export CycloneRun\n");\r |
| 251 | ot(" export CycloneVer\n");\r |
| 252 | ot("\n");\r |
| 253 | ot("CycloneVer dcd 0x%.4x\n",CycloneVer);\r |
| 254 | }\r |
| 255 | else\r |
| 256 | {\r |
| 257 | ot(" .global CycloneRun\n");\r |
| 258 | ot(" .global CycloneVer\n");\r |
| 259 | ot("CycloneVer: .long 0x%.4x\n",CycloneVer);\r |
| 260 | }\r |
| 261 | ot("\n");\r |
| 262 | \r |
| 263 | PrintFramework();\r |
| 264 | PrintOpcodes();\r |
| 265 | PrintJumpTable();\r |
| 266 | \r |
| 267 | if (ms) ot(" END\n");\r |
| 268 | \r |
| 269 | fclose(AsmFile); AsmFile=NULL;\r |
| 270 | \r |
| 271 | printf("Assembling...\n");\r |
| 272 | // Assemble the file\r |
| 273 | if (ms) system("armasm Cyclone.asm");\r |
| 274 | else system("as -o Cyclone.o Cyclone.s");\r |
| 275 | printf("Done!\n\n");\r |
| 276 | \r |
| 277 | free(CyJump);\r |
| 278 | return 0;\r |
| 279 | }\r |
| 280 | \r |
| 281 | int main()\r |
| 282 | {\r |
| 283 | printf("\n Cyclone 68000 Emulator v%x.%.3x - Core Creator\n\n",CycloneVer>>12,CycloneVer&0xfff);\r |
| 284 | \r |
| 285 | // Make GAS and ARMASM versions\r |
| 286 | for (ms=0;ms<2;ms++) CycloneMake();\r |
| 287 | return 0;\r |
| 288 | }\r |