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196ba1fc PH |
1 | /* altair_sys.c: MITS Altair system interface\r |
2 | \r | |
3 | Copyright (c) 1997-2005, Charles E. Owen\r | |
4 | \r | |
5 | Permission is hereby granted, free of charge, to any person obtaining a\r | |
6 | copy of this software and associated documentation files (the "Software"),\r | |
7 | to deal in the Software without restriction, including without limitation\r | |
8 | the rights to use, copy, modify, merge, publish, distribute, sublicense,\r | |
9 | and/or sell copies of the Software, and to permit persons to whom the\r | |
10 | Software is furnished to do so, subject to the following conditions:\r | |
11 | \r | |
12 | The above copyright notice and this permission notice shall be included in\r | |
13 | all copies or substantial portions of the Software.\r | |
14 | \r | |
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r | |
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL\r | |
18 | ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\r | |
19 | IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\r | |
20 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r | |
21 | \r | |
22 | Except as contained in this notice, the name of Charles E. Owen shall not be\r | |
23 | used in advertising or otherwise to promote the sale, use or other dealings\r | |
24 | in this Software without prior written authorization from Charles E. Owen.\r | |
25 | */\r | |
26 | \r | |
27 | #include <ctype.h>\r | |
28 | #include "altair_defs.h"\r | |
29 | \r | |
30 | extern DEVICE cpu_dev;\r | |
31 | extern DEVICE dsk_dev;\r | |
32 | extern UNIT cpu_unit;\r | |
33 | extern REG cpu_reg[];\r | |
34 | extern DEVICE sio_dev;\r | |
35 | extern DEVICE ptr_dev;\r | |
36 | extern DEVICE ptp_dev;\r | |
37 | extern DEVICE lpt_dev;\r | |
38 | extern unsigned char M[];\r | |
39 | extern int32 saved_PC;\r | |
40 | \r | |
41 | /* SCP data structures\r | |
42 | \r | |
43 | sim_name simulator name string\r | |
44 | sim_PC pointer to saved PC register descriptor\r | |
45 | sim_emax number of words needed for examine\r | |
46 | sim_devices array of pointers to simulated devices\r | |
47 | sim_stop_messages array of pointers to stop messages\r | |
48 | sim_load binary loader\r | |
49 | */\r | |
50 | \r | |
51 | char sim_name[] = "Altair 8800";\r | |
52 | \r | |
53 | REG *sim_PC = &cpu_reg[0];\r | |
54 | \r | |
55 | int32 sim_emax = 4;\r | |
56 | \r | |
57 | DEVICE *sim_devices[] = {\r | |
58 | &cpu_dev,\r | |
59 | &sio_dev,\r | |
60 | &ptr_dev,\r | |
61 | &ptp_dev,\r | |
62 | &dsk_dev,\r | |
63 | NULL\r | |
64 | };\r | |
65 | \r | |
66 | const char *sim_stop_messages[] = {\r | |
67 | "Unknown error",\r | |
68 | "Unknown I/O Instruction",\r | |
69 | "HALT instruction",\r | |
70 | "Breakpoint",\r | |
71 | "Invalid Opcode"\r | |
72 | };\r | |
73 | \r | |
74 | static const char *opcode[] = {\r | |
75 | "NOP", "LXI B", "STAX B", "INX B", /* 000-003 */\r | |
76 | "INR B", "DCR B", "MVI B", "RLC", /* 004-007 */\r | |
77 | "???", "DAD B", "LDAX B", "DCX B", /* 010-013 */\r | |
78 | "INR C", "DCR C", "MVI C", "RRC", /* 014-017 */\r | |
79 | "???", "LXI D", "STAX D", "INX D", /* 020-023 */\r | |
80 | "INR D", "DCR D", "MVI D", "RAL", /* 024-027 */\r | |
81 | "???", "DAD D", "LDAX D", "DCX D", /* 030-033 */\r | |
82 | "INR E", "DCR E", "MVI E", "RAR", /* 034-037 */\r | |
83 | "???", "LXI H", "SHLD", "INX H", /* 040-043 */\r | |
84 | "INR H", "DCR H", "MVI H", "DAA", /* 044-047 */\r | |
85 | "???", "DAD H", "LHLD", "DCX H", /* 050-053 */\r | |
86 | "INR L", "DCR L", "MVI L", "CMA", /* 054-057 */\r | |
87 | "???", "LXI SP", "STA", "INX SP", /* 060-063 */\r | |
88 | "INR M", "DCR M", "MVI M", "STC", /* 064-067 */\r | |
89 | "???", "DAD SP", "LDA", "DCX SP", /* 070-073 */\r | |
90 | "INR A", "DCR A", "MVI A", "CMC", /* 074-077 */\r | |
91 | "MOV B,B", "MOV B,C", "MOV B,D", "MOV B,E", /* 100-103 */\r | |
92 | "MOV B,H", "MOV B,L", "MOV B,M", "MOV B,A", /* 104-107 */\r | |
93 | "MOV C,B", "MOV C,C", "MOV C,D", "MOV C,E", /* 110-113 */\r | |
94 | "MOV C,H", "MOV C,L", "MOV C,M", "MOV C,A", /* 114-117 */\r | |
95 | "MOV D,B", "MOV D,C", "MOV D,D", "MOV D,E", /* 120-123 */\r | |
96 | "MOV D,H", "MOV D,L", "MOV D,M", "MOV D,A", /* 124-127 */\r | |
97 | "MOV E,B", "MOV E,C", "MOV E,D", "MOV E,E", /* 130-133 */\r | |
98 | "MOV E,H", "MOV E,L", "MOV E,M", "MOV E,A", /* 134-137 */\r | |
99 | "MOV H,B", "MOV H,C", "MOV H,D", "MOV H,E", /* 140-143 */\r | |
100 | "MOV H,H", "MOV H,L", "MOV H,M", "MOV H,A", /* 144-147 */\r | |
101 | "MOV L,B", "MOV L,C", "MOV L,D", "MOV L,E", /* 150-153 */\r | |
102 | "MOV L,H", "MOV L,L", "MOV L,M", "MOV L,A", /* 154-157 */\r | |
103 | "MOV M,B", "MOV M,C", "MOV M,D", "MOV M,E", /* 160-163 */\r | |
104 | "MOV M,H", "MOV M,L", "HLT", "MOV M,A", /* 164-167 */\r | |
105 | "MOV A,B", "MOV A,C", "MOV A,D", "MOV A,E", /* 170-173 */\r | |
106 | "MOV A,H", "MOV A,L", "MOV A,M", "MOV A,A", /* 174-177 */\r | |
107 | "ADD B", "ADD C", "ADD D", "ADD E", /* 200-203 */\r | |
108 | "ADD H", "ADD L", "ADD M", "ADD A", /* 204-207 */\r | |
109 | "ADC B", "ADC C", "ADC D", "ADC E", /* 210-213 */\r | |
110 | "ADC H", "ADC L", "ADC M", "ADC A", /* 214-217 */\r | |
111 | "SUB B", "SUB C", "SUB D", "SUB E", /* 220-223 */\r | |
112 | "SUB H", "SUB L", "SUB M", "SUB A", /* 224-227 */\r | |
113 | "SBB B", "SBB C", "SBB D", "SBB E", /* 230-233 */\r | |
114 | "SBB H", "SBB L", "SBB M", "SBB A", /* 234-237 */\r | |
115 | "ANA B", "ANA C", "ANA D", "ANA E", /* 240-243 */\r | |
116 | "ANA H", "ANA L", "ANA M", "ANA A", /* 244-247 */\r | |
117 | "XRA B", "XRA C", "XRA D", "XRA E", /* 250-253 */\r | |
118 | "XRA H", "XRA L", "XRA M", "XRA A", /* 254-257 */\r | |
119 | "ORA B", "ORA C", "ORA D", "ORA E", /* 260-263 */\r | |
120 | "ORA H", "ORA L", "ORA M", "ORA A", /* 264-267 */\r | |
121 | "CMP B", "CMP C", "CMP D", "CMP E", /* 270-273 */\r | |
122 | "CMP H", "CMP L", "CMP M", "CMP A", /* 274-277 */\r | |
123 | "RNZ", "POP B", "JNZ", "JMP", /* 300-303 */\r | |
124 | "CNZ", "PUSH B", "ADI", "RST 0", /* 304-307 */\r | |
125 | "RZ", "RET", "JZ", "???", /* 310-313 */\r | |
126 | "CZ", "CALL", "ACI", "RST 1", /* 314-317 */\r | |
127 | "RNC", "POP D", "JNC", "OUT", /* 320-323 */\r | |
128 | "CNC", "PUSH D", "SUI", "RST 2", /* 324-327 */\r | |
129 | "RC", "???", "JC", "IN", /* 330-333 */\r | |
130 | "CC", "???", "SBI", "RST 3", /* 334-337 */\r | |
131 | "RPO", "POP H", "JPO", "XTHL", /* 340-343 */\r | |
132 | "CPO", "PUSH H", "ANI", "RST 4", /* 344-347 */\r | |
133 | "RPE", "PCHL", "JPE", "XCHG", /* 350-353 */\r | |
134 | "CPE", "???", "XRI", "RST 5", /* 354-357 */\r | |
135 | "RP", "POP PSW", "JP", "DI", /* 360-363 */\r | |
136 | "CP", "PUSH PSW", "ORI", "RST 6", /* 364-367 */\r | |
137 | "RM", "SPHL", "JM", "EI", /* 370-373 */\r | |
138 | "CM", "???", "CPI", "RST 7", /* 374-377 */\r | |
139 | };\r | |
140 | \r | |
141 | int32 oplen[256] = {\r | |
142 | 1,3,1,1,1,1,2,1,0,1,1,1,1,1,2,1,0,3,1,1,1,1,2,1,0,1,1,1,1,1,2,1,\r | |
143 | 0,3,3,1,1,1,2,1,0,1,3,1,1,1,2,1,0,3,3,1,1,1,2,1,0,1,3,1,1,1,2,1,\r | |
144 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,\r | |
145 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,\r | |
146 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,\r | |
147 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,\r | |
148 | 1,1,3,3,3,1,2,1,1,1,3,0,3,3,2,1,1,1,3,2,3,1,2,1,1,0,3,2,3,0,2,1,\r | |
149 | 1,1,3,1,3,1,2,1,1,1,3,1,3,0,2,1,1,1,3,1,3,1,2,1,1,1,3,1,3,0,2,1 };\r | |
150 | \r | |
151 | /* This is the binary loader. The input file is considered to be\r | |
152 | a string of literal bytes with no format special format. The\r | |
153 | load starts at the current value of the PC.\r | |
154 | */\r | |
155 | \r | |
156 | int32 sim_load (FILE *fileref, char *cptr, char *fnam, int flag)\r | |
157 | {\r | |
158 | int32 i, addr = 0, cnt = 0;\r | |
159 | \r | |
160 | if ((*cptr != 0) || (flag != 0)) return SCPE_ARG;\r | |
161 | addr = saved_PC;\r | |
162 | while ((i = getc (fileref)) != EOF) {\r | |
163 | M[addr] = i;\r | |
164 | addr++;\r | |
165 | cnt++;\r | |
166 | } /* end while */\r | |
167 | printf ("%d Bytes loaded.\n", cnt);\r | |
168 | return (SCPE_OK);\r | |
169 | }\r | |
170 | \r | |
171 | /* Symbolic output\r | |
172 | \r | |
173 | Inputs:\r | |
174 | *of = output stream\r | |
175 | addr = current PC\r | |
176 | *val = pointer to values\r | |
177 | *uptr = pointer to unit\r | |
178 | sw = switches\r | |
179 | Outputs:\r | |
180 | status = error code\r | |
181 | */\r | |
182 | \r | |
183 | int32 fprint_sym (FILE *of, int32 addr, uint32 *val,\r | |
184 | UNIT *uptr, int32 sw)\r | |
185 | {\r | |
186 | int32 cflag, c1, c2, inst, adr;\r | |
187 | \r | |
188 | cflag = (uptr == NULL) || (uptr == &cpu_unit);\r | |
189 | c1 = (val[0] >> 8) & 0177;\r | |
190 | c2 = val[0] & 0177;\r | |
191 | if (sw & SWMASK ('A')) {\r | |
192 | fprintf (of, (c2 < 040)? "<%03o>": "%c", c2);\r | |
193 | return SCPE_OK;\r | |
194 | }\r | |
195 | if (sw & SWMASK ('C')) {\r | |
196 | fprintf (of, (c1 < 040)? "<%03o>": "%c", c1);\r | |
197 | fprintf (of, (c2 < 040)? "<%03o>": "%c", c2);\r | |
198 | return SCPE_OK;\r | |
199 | }\r | |
200 | if (!(sw & SWMASK ('M'))) return SCPE_ARG;\r | |
201 | inst = val[0];\r | |
202 | fprintf (of, "%s", opcode[inst]);\r | |
203 | if (oplen[inst] == 2) {\r | |
204 | if (strchr(opcode[inst], ' ') != NULL)\r | |
205 | fprintf (of, ",");\r | |
206 | else fprintf (of, " ");\r | |
207 | fprintf (of, "%o", val[1]);\r | |
208 | }\r | |
209 | if (oplen[inst] == 3) {\r | |
210 | adr = val[1] & 0xFF;\r | |
211 | adr |= (val[2] << 8) & 0xff00;\r | |
212 | if (strchr(opcode[inst], ' ') != NULL)\r | |
213 | fprintf (of, ",");\r | |
214 | else fprintf (of, " ");\r | |
215 | fprintf (of, "%o", adr);\r | |
216 | }\r | |
217 | return -(oplen[inst] - 1);\r | |
218 | }\r | |
219 | \r | |
220 | /* Symbolic input\r | |
221 | \r | |
222 | Inputs:\r | |
223 | *cptr = pointer to input string\r | |
224 | addr = current PC\r | |
225 | *uptr = pointer to unit\r | |
226 | *val = pointer to output values\r | |
227 | sw = switches\r | |
228 | Outputs:\r | |
229 | status = error status\r | |
230 | */\r | |
231 | \r | |
232 | int32 parse_sym (char *cptr, int32 addr, UNIT *uptr, uint32 *val, int32 sw)\r | |
233 | {\r | |
234 | int32 cflag, i = 0, j, r;\r | |
235 | char gbuf[CBUFSIZE];\r | |
236 | \r | |
237 | cflag = (uptr == NULL) || (uptr == &cpu_unit);\r | |
238 | while (isspace (*cptr)) cptr++; /* absorb spaces */\r | |
239 | if ((sw & SWMASK ('A')) || ((*cptr == '\'') && cptr++)) { /* ASCII char? */\r | |
240 | if (cptr[0] == 0) return SCPE_ARG; /* must have 1 char */\r | |
241 | val[0] = (uint32) cptr[0];\r | |
242 | return SCPE_OK;\r | |
243 | }\r | |
244 | if ((sw & SWMASK ('C')) || ((*cptr == '"') && cptr++)) { /* ASCII string? */\r | |
245 | if (cptr[0] == 0) return SCPE_ARG; /* must have 1 char */\r | |
246 | val[0] = ((uint32) cptr[0] << 8) + (uint32) cptr[1];\r | |
247 | return SCPE_OK;\r | |
248 | }\r | |
249 | \r | |
250 | /* An instruction: get opcode (all characters until null, comma,\r | |
251 | or numeric (including spaces).\r | |
252 | */\r | |
253 | \r | |
254 | while (1) {\r | |
255 | if (*cptr == ',' || *cptr == '\0' ||\r | |
256 | isdigit(*cptr))\r | |
257 | break;\r | |
258 | gbuf[i] = toupper(*cptr);\r | |
259 | cptr++;\r | |
260 | i++;\r | |
261 | }\r | |
262 | \r | |
263 | /* Allow for RST which has numeric as part of opcode */\r | |
264 | \r | |
265 | if (toupper(gbuf[0]) == 'R' &&\r | |
266 | toupper(gbuf[1]) == 'S' &&\r | |
267 | toupper(gbuf[2]) == 'T') {\r | |
268 | gbuf[i] = toupper(*cptr);\r | |
269 | cptr++;\r | |
270 | i++;\r | |
271 | }\r | |
272 | \r | |
273 | /* Allow for 'MOV' which is only opcode that has comma in it. */\r | |
274 | \r | |
275 | if (toupper(gbuf[0]) == 'M' &&\r | |
276 | toupper(gbuf[1]) == 'O' &&\r | |
277 | toupper(gbuf[2]) == 'V') {\r | |
278 | gbuf[i] = toupper(*cptr);\r | |
279 | cptr++;\r | |
280 | i++;\r | |
281 | gbuf[i] = toupper(*cptr);\r | |
282 | cptr++;\r | |
283 | i++;\r | |
284 | }\r | |
285 | \r | |
286 | /* kill trailing spaces if any */\r | |
287 | gbuf[i] = '\0';\r | |
288 | for (j = i - 1; gbuf[j] == ' '; j--) {\r | |
289 | gbuf[j] = '\0';\r | |
290 | }\r | |
291 | \r | |
292 | /* find opcode in table */\r | |
293 | for (j = 0; j < 256; j++) {\r | |
294 | if (strcmp(gbuf, opcode[j]) == 0)\r | |
295 | break;\r | |
296 | }\r | |
297 | if (j > 255) /* not found */\r | |
298 | return SCPE_ARG;\r | |
299 | \r | |
300 | val[0] = j; /* store opcode */\r | |
301 | if (oplen[j] < 2) /* if 1-byter we are done */\r | |
302 | return SCPE_OK;\r | |
303 | if (*cptr == ',') cptr++;\r | |
304 | cptr = get_glyph(cptr, gbuf, 0); /* get address */\r | |
305 | sscanf(gbuf, "%o", &r);\r | |
306 | if (oplen[j] == 2) {\r | |
307 | val[1] = r & 0xFF;\r | |
308 | return (-1);\r | |
309 | }\r | |
310 | val[1] = r & 0xFF;\r | |
311 | val[2] = (r >> 8) & 0xFF;\r | |
312 | return (-2);\r | |
313 | }\r |