6003a768 |
1 | \r |
619b1824 |
2 | // This file is part of the Cyclone 68000 Emulator\r |
3 | \r |
c41b9b97 |
4 | // Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\r |
5 | \r |
619b1824 |
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 |
6003a768 |
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 |
c30e2e2d |
25 | void ot(const char *format, ...)\r |
6003a768 |
26 | {\r |
c30e2e2d |
27 | va_list valist;\r |
6003a768 |
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 |
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238 | ot(";@ Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\n\n");\r |
239 | \r |
6003a768 |
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 |