swissChili | 97b5d8b | 2020-08-15 20:00:54 -0700 | [diff] [blame] | 1 | #include "as.h" |
| 2 | #include "../cpu.h" |
| 3 | #include "../instructions.h" |
| 4 | #include "../mnemonics.h" |
swissChili | ca0d2e2 | 2020-08-16 15:09:25 -0700 | [diff] [blame^] | 5 | #include "map.h" |
swissChili | 97b5d8b | 2020-08-15 20:00:54 -0700 | [diff] [blame] | 6 | |
swissChili | 97b5d8b | 2020-08-15 20:00:54 -0700 | [diff] [blame] | 7 | #include <string.h> |
| 8 | #include <ctype.h> |
| 9 | #include <stdbool.h> |
| 10 | |
| 11 | enum |
| 12 | { |
| 13 | ARG_16, /* Absolute 16 bit argument */ |
| 14 | ARG_8, /* Absolute 8 bit argument */ |
| 15 | ARG_8REL, /* Relative 8 bit argument */ |
| 16 | ARG_REL, /* Relative label */ |
| 17 | ARG_ABS, /* Absolute label */ |
| 18 | ARG_IMP, /* Implied argument */ |
| 19 | }; |
| 20 | |
| 21 | typedef struct |
| 22 | { |
| 23 | uint8_t opcode; |
| 24 | uint8_t arg_type; |
| 25 | union |
| 26 | { |
| 27 | char label[32]; |
| 28 | uint16_t long_arg; |
| 29 | uint8_t byte_arg; |
| 30 | int8_t rel_arg; |
| 31 | }; |
| 32 | } inst_t; |
| 33 | |
| 34 | void print_inst(inst_t *arg) |
| 35 | { |
| 36 | char *arg_types = |
| 37 | "16 8 8RELREL ABS IMP "; |
| 38 | |
| 39 | printf("\033[33mInst: %.4s $%x ", arg_types + arg->arg_type * 4, arg->opcode); |
| 40 | |
| 41 | switch (arg->arg_type) |
| 42 | { |
| 43 | case ARG_16: |
| 44 | printf("%x", arg->long_arg); |
| 45 | break; |
| 46 | case ARG_8: |
| 47 | printf("%x", arg->byte_arg); |
| 48 | break; |
| 49 | case ARG_8REL: |
| 50 | printf("%d", arg->rel_arg); |
| 51 | break; |
| 52 | case ARG_REL: |
| 53 | case ARG_ABS: |
| 54 | printf("%s", arg->label); |
| 55 | break; |
| 56 | } |
| 57 | |
| 58 | printf("\033[0m\n"); |
| 59 | } |
| 60 | |
| 61 | bool is_ident(char c) |
| 62 | { |
| 63 | return c && (isalpha(c) || isdigit(c)); |
| 64 | } |
| 65 | |
| 66 | uint32_t skip_ws(char **code) |
| 67 | { |
| 68 | uint32_t len = 0; |
| 69 | |
| 70 | for (; isspace(**code); (*code)++, len++) |
| 71 | {} |
| 72 | |
| 73 | return len; |
| 74 | } |
| 75 | |
| 76 | uint32_t skip_to_eol(char **code) |
| 77 | { |
| 78 | uint32_t len = 0; |
| 79 | |
| 80 | for (; **code && **code != '\n'; (*code)++, len++) |
| 81 | {} |
| 82 | |
| 83 | if (**code) |
| 84 | (*code)++; |
| 85 | |
| 86 | return len; |
| 87 | } |
| 88 | |
| 89 | char *parse_label_name(char **code) |
| 90 | { |
| 91 | char *start = *code; |
| 92 | for (; is_ident(**code); (*code)++) |
| 93 | {} |
| 94 | |
| 95 | if (start == *code) |
| 96 | return false; |
| 97 | |
| 98 | **code = 0; |
| 99 | return start; |
| 100 | } |
| 101 | |
| 102 | char *parse_label(char **code) |
| 103 | { |
| 104 | char *start = *code; |
| 105 | |
| 106 | for (; is_ident(**code); (*code)++) |
| 107 | {} |
| 108 | |
| 109 | skip_ws(code); |
| 110 | |
| 111 | if (**code == ':') |
| 112 | { |
| 113 | **code = 0; |
| 114 | (*code)++; |
| 115 | return start; |
| 116 | } |
| 117 | |
| 118 | *code = start; |
| 119 | |
| 120 | return NULL; |
| 121 | } |
| 122 | |
| 123 | char *parse_inst(char **code) |
| 124 | { |
| 125 | char *start = *code; |
| 126 | |
| 127 | for (; isalpha(**code); (*code)++) |
| 128 | {} |
| 129 | |
| 130 | **code = 0; |
| 131 | |
| 132 | if (start == *code) |
| 133 | return NULL; |
| 134 | |
| 135 | (*code)++; |
| 136 | return start; |
| 137 | } |
| 138 | |
| 139 | bool is_eol(char c) |
| 140 | { |
| 141 | return c == ';' || |
| 142 | c == '\n' || |
| 143 | c == '\r' || |
| 144 | c == '\0'; |
| 145 | } |
| 146 | |
| 147 | bool skip(char **code, const char *p) |
| 148 | { |
| 149 | for (; *p && *p == **code; p++, (*code)++) |
| 150 | {} |
| 151 | |
| 152 | if (!*p) |
| 153 | return true; |
| 154 | return false; |
| 155 | } |
| 156 | |
| 157 | bool parse_num(char **code, uint64_t *num) |
| 158 | { |
| 159 | char *start = *code; |
| 160 | int base = 10; |
| 161 | if (**code == '$') |
| 162 | { |
| 163 | base = 16; |
| 164 | (*code)++; |
| 165 | } |
| 166 | |
| 167 | skip_ws(code); |
| 168 | |
| 169 | char *endptr = *code; |
| 170 | int64_t val = strtol(*code, &endptr, base); |
| 171 | |
| 172 | if (*code == endptr) |
| 173 | { |
| 174 | *code = start; |
| 175 | return false; |
| 176 | } |
| 177 | *num = val; |
| 178 | *code = endptr; |
| 179 | return true; |
| 180 | } |
| 181 | |
| 182 | bool parse_num_max(char **code, uint64_t *num, uint64_t max) |
| 183 | { |
| 184 | uint64_t n; |
| 185 | if (parse_num(code, &n)) |
| 186 | { |
| 187 | if (n > max) |
| 188 | return false; |
| 189 | |
| 190 | *num = n; |
| 191 | return true; |
| 192 | } |
| 193 | else return false; |
| 194 | } |
| 195 | |
| 196 | bool parse_u8(char **code, uint8_t *num) |
| 197 | { |
| 198 | uint64_t n; |
| 199 | if (!parse_num_max(code, &n, 0xFF)) |
| 200 | return false; |
| 201 | |
| 202 | *num = n & 0xFF; |
| 203 | return true; |
| 204 | } |
| 205 | |
| 206 | bool parse_u16(char **code, uint16_t *num) |
| 207 | { |
| 208 | uint64_t n; |
| 209 | if (!parse_num_max(code, &n, 0xFFFF)) |
| 210 | return false; |
| 211 | |
| 212 | *num = n & 0xFFFF; |
| 213 | return true; |
| 214 | } |
| 215 | |
| 216 | bool ws_end(char **code) |
| 217 | { |
| 218 | skip_ws(code); |
| 219 | return is_eol(**code); |
| 220 | } |
| 221 | |
| 222 | bool parse_arg(char *code, int am, inst_t *inst) |
| 223 | { |
| 224 | skip_ws(&code); |
| 225 | |
| 226 | uint16_t num; |
| 227 | uint8_t num8; |
| 228 | char *lbl; |
| 229 | |
| 230 | switch (am) |
| 231 | { |
| 232 | case AM_ACC: |
| 233 | case AM_IMP: |
| 234 | printf("Trying AM_IMP on '%.8s'\n", code); |
| 235 | skip_ws(&code); |
| 236 | if (is_eol(*code)) |
| 237 | { |
| 238 | inst->arg_type = ARG_IMP; |
| 239 | return ws_end(&code); |
| 240 | } |
| 241 | break; |
| 242 | |
| 243 | case AM_IMM: |
| 244 | printf("Trying AM_IMM on '%.8s'\n", code); |
| 245 | if (!skip(&code, "#")) |
| 246 | return false; |
| 247 | skip_ws(&code); |
| 248 | case AM_ZP: |
| 249 | if (parse_u8(&code, &num8)) |
| 250 | { |
| 251 | inst->arg_type = ARG_8; |
| 252 | inst->byte_arg = num8; |
| 253 | |
| 254 | return ws_end(&code); |
| 255 | } |
| 256 | break; |
| 257 | |
| 258 | case AM_ABS: |
| 259 | if (parse_u16(&code, &num)) |
| 260 | { |
| 261 | inst->arg_type = ARG_16; |
| 262 | inst->long_arg = num; |
| 263 | return true; |
| 264 | } |
| 265 | else if ((lbl = parse_label_name(&code))) |
| 266 | { |
| 267 | inst->arg_type = ARG_ABS; |
| 268 | strncpy(inst->label, lbl, 32); |
| 269 | return true; |
| 270 | } |
| 271 | break; |
| 272 | |
| 273 | case AM_REL: |
| 274 | if (parse_u8(&code, &num8)) |
| 275 | { |
| 276 | inst->arg_type = ARG_8REL; |
| 277 | inst->rel_arg = num; |
| 278 | return ws_end(&code); |
| 279 | } |
| 280 | else if ((lbl = parse_label_name(&code))) |
| 281 | { |
| 282 | inst->arg_type = ARG_REL; |
| 283 | strncpy(inst->label, lbl, 32); |
| 284 | return ws_end(&code); |
| 285 | } |
| 286 | break; |
| 287 | |
| 288 | case AM_IND: |
| 289 | if (!skip(&code,"(")) |
| 290 | return false; |
| 291 | |
| 292 | if (!parse_u16(&code, &num)) |
| 293 | return false; |
| 294 | |
| 295 | if (!skip(&code, ")")) |
| 296 | return false; |
| 297 | |
| 298 | inst->arg_type = ARG_16; |
| 299 | inst->long_arg = num; |
| 300 | return true; |
| 301 | |
| 302 | case AM_AX: |
| 303 | case AM_ZPX: |
| 304 | case AM_AY: |
| 305 | case AM_ZPY: |
| 306 | if (am == AM_AX || am == AM_AY) |
| 307 | { |
| 308 | if (!parse_u16(&code, &num)) |
| 309 | return false; |
| 310 | inst->arg_type = ARG_16; |
| 311 | inst->long_arg = num; |
| 312 | } |
| 313 | else |
| 314 | { |
| 315 | if (!parse_u8(&code, &num8)) |
| 316 | return false; |
| 317 | inst->arg_type = ARG_8; |
| 318 | inst->byte_arg = num8; |
| 319 | } |
| 320 | if (!skip(&code, ",")) |
| 321 | return false; |
| 322 | |
| 323 | skip_ws(&code); |
| 324 | |
| 325 | if (tolower(*code) != (am == AM_AY || am == AM_ZPY ? 'y' : 'x')) |
| 326 | return false; |
| 327 | |
| 328 | return ws_end(&code); |
| 329 | |
| 330 | case AM_ZIX: |
| 331 | if (!skip(&code, "(")) |
| 332 | break; |
| 333 | skip_ws(&code); |
| 334 | if (!parse_u8(&code, &num8)) |
| 335 | break; |
| 336 | skip_ws(&code); |
| 337 | if (!skip(&code, ",")) |
| 338 | break; |
| 339 | skip_ws(&code); |
| 340 | if (tolower(*code) != 'x') |
| 341 | return false; |
| 342 | skip_ws(&code); |
| 343 | |
| 344 | if (!skip(&code, ")")) |
| 345 | break; |
| 346 | |
| 347 | inst->arg_type = ARG_8; |
| 348 | inst->byte_arg = num8; |
| 349 | return ws_end(&code); |
| 350 | |
| 351 | case AM_ZIY: |
| 352 | if (!skip(&code, "(")) |
| 353 | break; |
| 354 | skip_ws(&code); |
| 355 | if (!parse_u8(&code, &num8)) |
| 356 | break; |
| 357 | skip_ws(&code); |
| 358 | if (!skip(&code, ")")) |
| 359 | break; |
| 360 | skip_ws(&code); |
| 361 | if (!skip(&code, ",")) |
| 362 | break; |
| 363 | skip_ws(&code); |
| 364 | if (tolower(*code) != 'x') |
| 365 | break; |
| 366 | |
| 367 | inst->arg_type = ARG_8; |
| 368 | inst->byte_arg = num8; |
| 369 | return ws_end(&code); |
| 370 | } |
| 371 | return false; |
| 372 | } |
| 373 | |
| 374 | uint32_t assemble(char *code, FILE *out) |
| 375 | { |
swissChili | ca0d2e2 | 2020-08-16 15:09:25 -0700 | [diff] [blame^] | 376 | uintptr_t num_insts = 0, |
| 377 | pc = 0x600; |
swissChili | 97b5d8b | 2020-08-15 20:00:54 -0700 | [diff] [blame] | 378 | uint32_t line_no = 1; |
swissChili | ca0d2e2 | 2020-08-16 15:09:25 -0700 | [diff] [blame^] | 379 | map_t *labels = new_map(); |
swissChili | 97b5d8b | 2020-08-15 20:00:54 -0700 | [diff] [blame] | 380 | char *line; |
| 381 | |
| 382 | printf("Assembling File\n"); |
| 383 | printf("%s\n", code); |
| 384 | |
| 385 | line = strtok(code, "\r\n"); |
| 386 | |
| 387 | while (line) |
| 388 | { |
| 389 | skip_ws(&line); |
| 390 | |
| 391 | printf("\033[36m%.9s\033[0m\n", line); |
| 392 | |
| 393 | char *label = parse_label(&line), |
| 394 | *mn = parse_inst(&line); |
| 395 | int32_t mnemonic = -1; |
| 396 | |
| 397 | if (label) |
| 398 | { |
swissChili | ca0d2e2 | 2020-08-16 15:09:25 -0700 | [diff] [blame^] | 399 | map_set(labels, label, (void *)pc); |
| 400 | printf("Set label %s at %lu\n", label, pc); |
swissChili | 97b5d8b | 2020-08-15 20:00:54 -0700 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | if (mn) |
| 404 | { |
| 405 | #define MN(a) if (!strcasecmp(mn, #a)) \ |
swissChili | ca0d2e2 | 2020-08-16 15:09:25 -0700 | [diff] [blame^] | 406 | { \ |
swissChili | 97b5d8b | 2020-08-15 20:00:54 -0700 | [diff] [blame] | 407 | mnemonic = a; \ |
swissChili | ca0d2e2 | 2020-08-16 15:09:25 -0700 | [diff] [blame^] | 408 | } \ |
swissChili | 97b5d8b | 2020-08-15 20:00:54 -0700 | [diff] [blame] | 409 | else |
| 410 | |
| 411 | MNEMONICS; |
| 412 | #undef MN |
| 413 | |
| 414 | printf("Got instruction %s %d\n", mn, mnemonic); |
| 415 | |
| 416 | inst_t arg; |
| 417 | // printf("Parsing '%s'\n", line); |
| 418 | #define INST(_mn, am, op, len) \ |
| 419 | if (mnemonic == _mn && parse_arg(line, am, &arg)) \ |
| 420 | { \ |
| 421 | arg.opcode = op; \ |
swissChili | ca0d2e2 | 2020-08-16 15:09:25 -0700 | [diff] [blame^] | 422 | pc += len; \ |
swissChili | 97b5d8b | 2020-08-15 20:00:54 -0700 | [diff] [blame] | 423 | print_inst(&arg); \ |
| 424 | } \ |
| 425 | else |
| 426 | |
| 427 | INSTRUCTIONS |
| 428 | { |
| 429 | printf("\033[31mCould not be parsed: %s '%s'\033[0m\n", mn, line); |
| 430 | } |
| 431 | #undef INST |
| 432 | } |
| 433 | |
swissChili | 97b5d8b | 2020-08-15 20:00:54 -0700 | [diff] [blame] | 434 | line = strtok(NULL, "\r\n"); |
| 435 | } |
| 436 | |
| 437 | free_map(labels); |
| 438 | |
| 439 | return num_insts; |
| 440 | } |