Mercurial > hg-old > index.cgi
annotate src/index.c @ 11:c4b2f96eaea6 1.0
Fixed error in instruction table
| author | lost |
|---|---|
| date | Sun, 04 Jan 2009 05:44:50 +0000 |
| parents | 34568fab6058 |
| children |
| rev | line source |
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| 0 | 1 /* |
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34568fab6058
Fixed package to include all required files; also added copyright preamble to all source files
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2 index.c, Copyright © 2008 William Astle |
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34568fab6058
Fixed package to include all required files; also added copyright preamble to all source files
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3 |
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4 This file is part of LWASM. |
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5 |
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34568fab6058
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6 LWASM is free software: you can redistribute it and/or modify it under the |
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34568fab6058
Fixed package to include all required files; also added copyright preamble to all source files
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7 terms of the GNU General Public License as published by the Free Software |
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34568fab6058
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8 Foundation, either version 3 of the License, or (at your option) any later |
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34568fab6058
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9 version. |
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10 |
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34568fab6058
Fixed package to include all required files; also added copyright preamble to all source files
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11 This program is distributed in the hope that it will be useful, but WITHOUT |
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34568fab6058
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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34568fab6058
Fixed package to include all required files; also added copyright preamble to all source files
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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34568fab6058
Fixed package to include all required files; also added copyright preamble to all source files
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14 more details. |
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15 |
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34568fab6058
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16 You should have received a copy of the GNU General Public License along with |
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34568fab6058
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17 this program. If not, see <http://www.gnu.org/licenses/>. |
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34568fab6058
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18 |
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34568fab6058
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19 Contains code for parsing indexed addressing modes |
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34568fab6058
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20 |
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34568fab6058
Fixed package to include all required files; also added copyright preamble to all source files
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21 */ |
| 0 | 22 |
| 23 #include <ctype.h> | |
| 24 //#include <errno.h> | |
| 25 //#include <stdio.h> | |
| 26 //#include <stdlib.h> | |
| 27 #include <string.h> | |
| 28 #define __index_c_seen__ | |
| 29 //#include "instab.h" | |
| 30 #include "lwasm.h" | |
| 31 #include "instab.h" | |
| 32 | |
| 33 | |
| 34 int parse_index_expr(asmstate_t *as, sourceline_t *cl, char **optr, int *postbyte, int *opmode, int *v1) | |
| 35 { | |
| 36 static const char *regs = "X Y U S W PCRPC "; | |
| 37 static const struct { char *opstr; int pb; } simpleindex[] = | |
| 38 { | |
| 39 {",x", 0x84}, {",y", 0xa4}, {",u", 0xc4}, {",s", 0xe4}, | |
| 40 {",x+", 0x80}, {",y+", 0xa0}, {",u+", 0xc0}, {",s+", 0xe0}, | |
| 41 {",x++", 0x81}, {",y++", 0xa1}, {",u++", 0xc1}, {",s++", 0xe1}, | |
| 42 {",-x", 0x82}, {",-y", 0xa2}, {",-u", 0xc2}, {",-s", 0xe2}, | |
| 43 {",--x", 0x83}, {",--y", 0xa3}, {",--u", 0xc3}, {",--s", 0xe3}, | |
| 44 {"a,x", 0x86}, {"a,y", 0xa6}, {"a,u", 0xc6}, {"a,s", 0xe6}, | |
| 45 {"b,x", 0x85}, {"b,y", 0xa5}, {"b,u", 0xc5}, {"b,s", 0xe5}, | |
| 46 {"e,x", 0x87}, {"e,y", 0xa7}, {"e,u", 0xc7}, {"e,s", 0xe7}, | |
| 47 {"f,x", 0x8a}, {"f,y", 0xaa}, {"f,u", 0xca}, {"f,s", 0xea}, | |
| 48 {"d,x", 0x8b}, {"d,y", 0xab}, {"d,u", 0xcb}, {"d,s", 0xed}, | |
| 49 {"w,x", 0x8e}, {"w,y", 0xae}, {"w,u", 0xce}, {"w,s", 0xee}, | |
| 50 {",w", 0x8f}, {",w++", 0xcf}, {",--w", 0xef}, | |
| 51 | |
| 52 {"[,x]", 0x94}, {"[,y]", 0xb4}, {"[,u", 0xd4}, {"[,s]", 0xf4}, | |
| 53 {"[,x++]", 0x91}, {"[,y++]", 0xb1}, {"[,u++]", 0xd1}, {"[,s++]", 0xf1}, | |
| 54 {"[,--x]", 0x93}, {"[,--y]", 0xb3}, {"[,--u]", 0xd3}, {"[,--s]", 0xf3}, | |
| 55 {"[a,x]", 0x96}, {"[a,y]", 0xb6}, {"[a,u]", 0xd6}, {"[a,s]", 0xf6}, | |
| 56 {"[b,x]", 0x95}, {"[b,y]", 0xb5}, {"[b,u]", 0xd5}, {"[b,s]", 0xf5}, | |
| 57 {"[e,x]", 0x97}, {"[e,y]", 0xb7}, {"[e,u]", 0xd7}, {"[e,s]", 0xf7}, | |
| 58 {"[f,x]", 0x9a}, {"[f,y]", 0xba}, {"[f,u]", 0xda}, {"[f,s]", 0xfa}, | |
| 59 {"[d,x]", 0x9b}, {"[d,y]", 0xbb}, {"[d,u]", 0xdb}, {"[d,s]", 0xfd}, | |
| 60 {"[w,x]", 0x9e}, {"[w,y]", 0xbe}, {"[w,u]", 0xde}, {"[w,s]", 0xfe}, | |
| 61 {"[,w]", 0x90}, {"[,w++]", 0xd0}, {"[,--w]", 0xf0}, | |
| 62 | |
| 63 { "", -1 } | |
| 64 }; | |
| 65 char stbuf[25]; | |
| 66 int i; | |
| 67 int f8 = 0, f16 = 0; | |
| 68 int rn; | |
| 69 int indir = 0; | |
| 70 int rval; | |
| 71 int f0 = 0; | |
| 72 | |
| 73 for (i = 0; i < 24; i++) | |
| 74 { | |
| 75 if (*((*optr) + i) && !isspace(*((*optr) + i))) | |
| 76 stbuf[i] = *((*optr) + i); | |
| 77 else | |
| 78 break; | |
| 79 } | |
| 80 stbuf[i] = '\0'; | |
| 81 if (!*((*optr) + i) || isspace(*((*optr) + i))) | |
| 82 { | |
| 83 int j; | |
| 84 // do simple lookup | |
| 85 for (j = 0; simpleindex[j].opstr[0]; j++) | |
| 86 { | |
| 87 if (!strcasecmp(stbuf, simpleindex[j].opstr)) | |
| 88 break; | |
| 89 } | |
| 90 if (simpleindex[j].opstr[0]) | |
| 91 { | |
| 92 *postbyte = simpleindex[j].pb; | |
| 93 *opmode = OPER_INDEX; | |
| 94 (*optr) += i; | |
| 95 return 0; | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 // now we have the hard ones to work out here | |
| 100 | |
| 101 if (**optr == '[') | |
| 102 { | |
| 103 indir = 1; | |
| 104 (*optr)++; | |
| 105 } | |
| 106 | |
| 107 rn = 0; | |
| 108 for (i = 0; (*optr)[i] && !isspace((*optr)[i]); i++) | |
| 109 { | |
| 110 if ((*optr)[i] == ',') | |
| 111 { | |
| 112 rn = 1; | |
| 113 break; | |
| 114 } | |
| 115 } | |
| 116 | |
| 117 if (!rn && indir) | |
| 118 { | |
| 119 // extended indir | |
| 120 *postbyte = 0x9f; | |
| 121 *opmode = OPER_EXTIND; | |
| 122 rval = eval_expr(as, cl, optr, v1); | |
| 123 if (**optr != ']') | |
| 124 { | |
| 125 errorp1(ERR_BADOPER); | |
| 126 } | |
| 127 (*optr)++; | |
| 128 return 0; | |
| 129 } | |
| 130 | |
| 131 if (cl -> p1f16) | |
| 132 f16 = 1; | |
| 133 if (**optr == '<') | |
| 134 { | |
| 135 f8 = 1; | |
| 136 (*optr)++; | |
| 137 } | |
| 138 else if (**optr == '>') | |
| 139 { | |
| 140 f16 = 1; | |
| 141 (*optr)++; | |
| 142 } | |
| 143 | |
| 144 if (**optr == '0' && *(*optr+1) == ',') | |
| 145 { | |
| 146 f0 = 1; | |
| 147 } | |
| 148 | |
| 149 // now we have to evaluate the expression | |
| 150 rval = eval_expr(as, cl, optr, v1); | |
| 151 | |
| 152 if (cl -> undef && as -> passnum == 1) | |
| 153 { | |
| 154 cl -> p1f16 = 1; | |
| 155 f16 = 1; | |
| 156 } | |
| 157 | |
| 158 // now look for a comma; if not present, explode | |
| 159 if (rval == -1 || *(*optr)++ != ',') | |
| 160 { | |
| 161 // syntax error; force 0 bit | |
| 162 *postbyte = -1; | |
| 163 *opmode = OPER_INDEX; | |
| 164 return -2; | |
| 165 } | |
| 166 | |
| 167 // now get the register | |
| 168 rn = lookupreg3(regs, optr); | |
| 169 if (rn < 0) | |
| 170 goto reterr; | |
| 171 | |
| 172 // debug("Reg: %d\n", rn); | |
| 173 | |
| 174 if (indir && **optr != ']') | |
| 175 goto reterr; | |
| 176 else | |
| 177 (*optr)++; | |
| 178 | |
| 179 // nnnn,W is only 16 bit | |
| 180 if (rn == 4) | |
| 181 { | |
| 182 if (f8) | |
| 183 goto reterr; | |
| 184 if (!f16 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE) && *v1 == 0) | |
| 185 { | |
| 186 *opmode = OPER_INDEX; | |
| 187 if (indir) | |
| 188 *postbyte = 0x90; | |
| 189 else | |
| 190 *postbyte = 0x8f; | |
| 191 return 0; | |
| 192 } | |
| 193 *opmode = OPER_INDEX16; | |
| 194 if (indir) | |
| 195 *postbyte = 0xb0; | |
| 196 else | |
| 197 *postbyte = 0xcf; | |
| 198 return 0; | |
| 199 } | |
| 200 | |
| 201 if (indir) indir = 0x10; | |
| 202 | |
| 203 // forward ref; we can't figure anything | |
| 204 if (cl -> undef) | |
| 205 { | |
| 206 f16 = 1; | |
| 207 } | |
| 208 | |
| 209 // PCR? redo v1, v2 relative to current address | |
| 210 if (rn == 5) | |
| 211 { | |
| 212 *v1 -= as -> addr; | |
| 213 | |
| 214 // we have a slight problem here | |
| 215 // PCR based on current insn loc is really | |
| 216 // -125 <= offset <= +130 (8 bit offset) | |
| 217 if (f8 || (!f16 && *v1 >= -125 && *v1 <= 130)) | |
| 218 { | |
| 219 *opmode = OPER_INDEX8; | |
| 220 *postbyte = indir | 0x8C; | |
| 221 *v1 -= 3; | |
| 222 if (*v1 < -128 || *v1 > 127) | |
| 223 errorp2(ERR_OVERFLOW); | |
| 224 return 0; | |
| 225 } | |
| 226 | |
| 227 // anything else is 16 bit offset | |
| 228 // need 16 bit | |
| 229 *opmode = OPER_INDEX16; | |
| 230 *postbyte = indir | 0x8D; | |
| 231 *v1 -= 4; | |
| 232 return 0; | |
| 233 } | |
| 234 | |
| 235 // constant offset from PC | |
| 236 if (rn == 6) | |
| 237 { | |
| 238 if (f8 || (!f16 && *v1 >= -128 && *v1 <= 127)) | |
| 239 { | |
| 240 *opmode = OPER_INDEX8; | |
| 241 *postbyte = indir | 0x8C; | |
| 242 if (*v1 < -128 || *v1 > 127) | |
| 243 errorp2(ERR_OVERFLOW); | |
| 244 return 0; | |
| 245 } | |
| 246 | |
| 247 // everything else must be 16 bit | |
| 248 // need 16 bit | |
| 249 *opmode = OPER_INDEX16; | |
| 250 *postbyte = indir | 0x8D; | |
| 251 return 0; | |
| 252 | |
| 253 } | |
| 254 | |
| 255 // we only have to deal with x,y,u,s here | |
| 256 if (!f8 && !f16 && *v1 >= -16 && *v1 <= 15) | |
| 257 { | |
| 258 if (*v1 == 0 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE)) | |
| 259 { | |
| 260 *postbyte = rn << 5 | indir | 0x80 | 0x04; | |
| 261 *opmode = OPER_INDEX; | |
| 262 return 0; | |
| 263 } | |
| 264 // we pick the smallest value here | |
| 265 if (indir) | |
| 266 { | |
| 267 f8 = 1; | |
| 268 goto no5bit; | |
| 269 } | |
| 270 *postbyte = rn << 5 | (*v1 & 0x1F); | |
| 271 *opmode = OPER_INDEX5; | |
| 272 return 0; | |
| 273 } | |
| 274 no5bit: | |
| 275 if (f16 || (!f8 && (*v1 < -128 || *v1 > 127))) | |
| 276 { | |
| 277 // must be a 16 bit offset here | |
| 278 *postbyte = rn << 5 | indir | 0x80 | 0x09; | |
| 279 *opmode = OPER_INDEX16; | |
| 280 return 0; | |
| 281 } | |
| 282 | |
| 283 // if we're here, we have an 8 bit offset | |
| 284 *postbyte = rn << 5 | indir | 0x80 | 0x08; | |
| 285 *opmode = OPER_INDEX8; | |
| 286 if (*v1 < -128 || *v1 > 127) | |
| 287 errorp2(ERR_OVERFLOW); | |
| 288 return 0; | |
| 289 reterr: | |
| 290 *postbyte = -1; | |
| 291 *opmode = OPER_INDEX; | |
| 292 return -2; | |
| 293 } | |
| 294 | |
| 295 void insn_indexed_aux(asmstate_t *as, sourceline_t *cl, char **optr, int *b1, int *b2, int *b3) | |
| 296 { | |
| 297 int rval; | |
| 298 int v1, pb = -1; | |
| 299 | |
| 300 *b1 = *b2 = *b3 = -1; | |
| 301 | |
| 302 rval = parse_index_expr(as, cl, optr, &pb, &(cl -> addrmode), &v1); | |
| 303 if (rval < 0) | |
| 304 errorp1(ERR_BADOPER); | |
| 305 *b1 = pb; | |
| 306 | |
| 307 if (cl -> addrmode == OPER_INDEX8) | |
| 308 { | |
| 309 *b2 = v1 & 0xff; | |
| 310 } | |
| 311 else if (cl -> addrmode == OPER_INDEX16 || cl -> addrmode == OPER_EXTIND) | |
| 312 { | |
| 313 *b2 = (v1 & 0xffff) >> 8; | |
| 314 *b3 = v1 & 0xff; | |
| 315 } | |
| 316 } | |
| 317 | |
| 318 void insn_indexed(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 319 { | |
| 320 int b1, b2, b3; | |
| 321 | |
| 322 emitop(instab[cl -> opcode].ops[0]); | |
| 323 insn_indexed_aux(as, cl, optr, &b1, &b2, &b3); | |
| 324 if (b1 != -1) | |
| 325 emit(b1); | |
| 326 if (b2 != -1) | |
| 327 emit(b2); | |
| 328 if (b3 != -1) | |
| 329 emit(b3); | |
| 330 } | |
| 331 |