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annotate src/insn_indexed.c @ 101:f59c0916753d
Fixed relative branches and PCR addressing to handle constant intra-section references properly
| author | lost |
|---|---|
| date | Fri, 23 Jan 2009 03:36:27 +0000 |
| parents | e12edcfbebd5 |
| children |
| rev | line source |
|---|---|
| 32 | 1 /* |
| 2 insn_indexed.c | |
|
33
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Added general addressing modes (immediate, base page, extended, indexed)
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3 Copyright © 2009 William Astle |
| 32 | 4 |
| 5 This file is part of LWASM. | |
| 6 | |
| 7 LWASM is free software: you can redistribute it and/or modify it under the | |
| 8 terms of the GNU General Public License as published by the Free Software | |
| 9 Foundation, either version 3 of the License, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 15 more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License along with | |
| 18 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 */ | |
| 20 | |
| 21 /* | |
| 22 for handling indexed mode instructions | |
| 23 */ | |
| 24 | |
| 25 #define __insn_indexed_c_seen__ | |
| 26 | |
| 27 #include <ctype.h> | |
| 28 #include <string.h> | |
| 29 | |
| 30 #include "lwasm.h" | |
| 31 #include "instab.h" | |
| 32 #include "expr.h" | |
| 33 | |
| 34 void insn_indexed_aux(asmstate_t *as, lwasm_line_t *l, const char **p, int *b1, int *b2, int *b3) | |
| 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]; | |
| 81 | 66 int i, j, rn; |
| 67 int f8 = 0, f16 = 0, f0 = 0; | |
| 68 int r, v; | |
| 32 | 69 int indir = 0; |
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70 int fs8 = 0, fs16 = 0; |
| 81 | 71 |
| 72 // initialize output bytes | |
| 32 | 73 *b1 = *b2 = *b3 = -1; |
| 74 | |
| 81 | 75 // fetch out operand for lookup |
| 32 | 76 for (i = 0; i < 24; i++) |
| 77 { | |
| 78 if (*((*p) + i) && !isspace(*((*p) + i))) | |
| 79 stbuf[i] = *((*p) + i); | |
| 80 else | |
| 81 break; | |
| 82 } | |
| 83 stbuf[i] = '\0'; | |
| 81 | 84 |
| 85 // now look up operand in "simple" table | |
| 32 | 86 if (!*((*p) + i) || isspace(*((*p) + i))) |
| 87 { | |
| 88 // do simple lookup | |
| 89 for (j = 0; simpleindex[j].opstr[0]; j++) | |
| 90 { | |
| 91 if (!strcasecmp(stbuf, simpleindex[j].opstr)) | |
| 92 break; | |
| 93 } | |
| 94 if (simpleindex[j].opstr[0]) | |
| 95 { | |
| 96 *b1 = simpleindex[j].pb; | |
| 97 (*p) += i; | |
| 98 return; | |
| 99 } | |
| 100 } | |
| 81 | 101 |
| 102 // now do the "hard" ones | |
| 103 | |
| 104 // is it indirect? | |
| 32 | 105 if (**p == '[') |
| 106 { | |
| 107 indir = 1; | |
| 108 (*p)++; | |
| 109 } | |
| 110 | |
| 81 | 111 // look for a "," - all indexed modes have a "," except extended indir |
| 32 | 112 rn = 0; |
| 113 for (i = 0; (*p)[i] && !isspace((*p)[i]); i++) | |
| 114 { | |
| 115 if ((*p)[i] == ',') | |
| 116 { | |
| 117 rn = 1; | |
| 118 break; | |
| 119 } | |
| 120 } | |
| 81 | 121 |
| 122 // if no "," and indirect, do extended indir | |
| 32 | 123 if (!rn && indir) |
| 124 { | |
| 125 // extended indir | |
| 126 *b1 = 0x9f; | |
| 127 *b2 = 0; | |
| 128 *b3 = 0; | |
| 81 | 129 r = lwasm_expr_result2(as, l, (char **)p, 0, &v, 0); |
| 130 if (r < 0) | |
| 32 | 131 { |
| 132 return; | |
| 133 } | |
| 134 if (**p != ']') | |
| 135 { | |
| 136 register_error(as, l, 1, "Bad operand"); | |
| 137 return; | |
| 138 } | |
| 81 | 139 |
| 32 | 140 (*p)++; |
| 81 | 141 |
| 142 if (r == 1 && as -> passnum == 2) | |
| 32 | 143 { |
| 81 | 144 l -> relocoff = as -> addr - l -> codeaddr + 1; |
| 32 | 145 } |
| 81 | 146 |
| 147 *b2 = (v >> 8) & 0xff; | |
| 148 *b3 = v & 0xff; | |
| 32 | 149 return; |
| 150 } | |
| 151 | |
| 81 | 152 // if we've previously forced the offset size, make a note of it |
| 153 if (l -> fsize == 1) | |
| 154 f8 = 1; | |
| 155 else if (l -> fsize == 2) | |
| 156 f16 = 1; | |
| 157 | |
| 32 | 158 if (**p == '<') |
| 159 { | |
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160 fs8 = 1; |
| 32 | 161 (*p)++; |
| 162 } | |
| 163 else if (**p == '>') | |
| 164 { | |
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165 fs16 = 1; |
| 32 | 166 (*p)++; |
| 167 } | |
| 168 | |
| 169 if (**p == '0' && *(*p+1) == ',') | |
| 170 { | |
| 171 f0 = 1; | |
| 172 } | |
| 173 | |
| 174 // now we have to evaluate the expression | |
| 81 | 175 r = lwasm_expr_result2(as, l, (char **)p, 0, &v, 0); |
| 176 if (r < 0) | |
| 32 | 177 { |
| 178 return; | |
| 179 } | |
| 180 // now look for a comma; if not present, explode | |
| 181 if (*(*p)++ != ',') | |
| 182 { | |
| 183 // syntax error; force 0 bit | |
| 184 *b1 = 00; | |
| 81 | 185 l -> fsize = 0; |
| 32 | 186 return; |
| 187 } | |
| 188 | |
| 189 // now get the register | |
| 190 rn = lwasm_lookupreg3(regs, p); | |
| 191 if (rn < 0) | |
| 81 | 192 { |
| 193 *b1 = 0; | |
| 194 l -> fsize = 0; | |
| 195 register_error(as, l, 1, "Bad register"); | |
| 196 return; | |
| 197 } | |
| 198 | |
| 32 | 199 if (indir) |
| 200 { | |
| 201 if (**p != ']') | |
| 81 | 202 { |
| 203 register_error(as, l, 1, "Bad operand"); | |
| 204 l -> fsize = 0; | |
| 205 *b1 = 0; | |
| 206 return; | |
| 207 } | |
| 32 | 208 else |
| 209 (*p)++; | |
| 210 } | |
| 211 | |
| 81 | 212 // incomplete reference on pass 1 forces 16 bit |
| 213 if (r == 1 && as -> passnum == 1) | |
| 214 { | |
| 215 f16 = 1; | |
| 216 l -> fsize = 2; | |
| 217 } | |
| 218 | |
| 219 // incomplete reference on pass 2 needs relocoff set | |
| 220 if (r == 1 && as -> passnum == 2) | |
| 221 { | |
| 222 l -> relocoff = as -> addr - l -> codeaddr + 1; | |
| 223 } | |
| 224 | |
| 225 // nnnn,W is only 16 bit (or 0 bit) | |
| 32 | 226 if (rn == 4) |
| 227 { | |
| 228 if (f8) | |
| 81 | 229 { |
| 230 register_error(as, l, 1, "n,W cannot be 8 bit"); | |
| 231 l -> fsize = 0; | |
| 232 *b1 = 0; | |
| 233 return; | |
| 234 } | |
| 235 // note: set f16 above for incomplete references | |
| 236 // also set reloc offset | |
| 237 if (!f16 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE) && v == 0) | |
| 32 | 238 { |
| 239 if (indir) | |
| 240 *b1 = 0x90; | |
| 241 else | |
| 242 *b1 = 0x8f; | |
| 243 return; | |
| 244 } | |
| 81 | 245 |
| 32 | 246 if (indir) |
| 247 *b1 = 0xb0; | |
| 248 else | |
| 249 *b1 = 0xcf; | |
| 81 | 250 *b2 = (v >> 8) & 0xff; |
| 251 *b3 = v & 0xff; | |
| 32 | 252 return; |
| 253 } | |
| 254 | |
| 81 | 255 // set indir to correct bit value |
| 32 | 256 if (indir) indir = 0x10; |
| 257 | |
| 81 | 258 // PCR? then we have PC relative addressing (like B??, LB??) |
| 32 | 259 if (rn == 5) |
| 260 { | |
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261 lwasm_expr_term_t *t; |
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262 // external references are handled exactly the same as for |
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263 // relative addressing modes |
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264 // on pass 1, adjust the expression for a subtraction of the |
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265 // current address |
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266 |
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267 // need to re-evaluate the expression with "SECTCONST"... |
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268 r = lwasm_expr_result2(as, l, (char **)p, EXPR_SECTCONST | EXPR_REEVAL, &v, 0); |
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269 if (r != 0) |
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270 v = 0; |
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271 if (as -> passnum == 1) |
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272 { |
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273 l -> fsize = 0; |
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274 } |
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275 f8 = f16 = 0; |
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276 if (r == 1 && as -> passnum == 1 && !fs8) |
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277 { |
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278 l -> fsize = 2; |
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279 f16 = 1; |
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280 } |
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281 if (fs8) |
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282 f8 = 1; |
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283 if (fs16) |
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284 f16 = 1; |
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285 if (l -> fsize == 2) |
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286 f16 = 1; |
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287 else if (l -> fsize == 1) |
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288 f8 = 1; |
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289 if (as -> passnum == 1) |
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290 v -= as -> addr; |
| 32 | 291 |
| 292 // we have a slight problem here | |
| 293 // PCR based on current insn loc is really | |
| 294 // -125 <= offset <= +130 (8 bit offset) | |
| 295 // NOTE: when we are called, we already have the opcode emitted | |
| 296 // so we only need to worry about the size of the operand | |
| 297 // hence the 2 and 3 magic numbers below instead of 3 and 4 | |
| 298 // (and that also avoids errors with two byte opcodes, etc) | |
| 81 | 299 if (f8 || (!f16 && v >= -125 && v <= 130)) |
| 32 | 300 { |
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301 f8 = 1; |
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302 l -> fsize = 1; |
| 32 | 303 *b1 = indir | 0x8C; |
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304 if (as -> passnum == 1) |
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305 v -= 2; |
| 81 | 306 if (v < -128 || v > 127) |
| 32 | 307 register_error(as, l, 2, "Byte overflow"); |
| 81 | 308 *b2 = v & 0xff; |
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309 if (r != 0 && as -> passnum == 2) |
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310 { |
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311 register_error(as, l, 2, "Illegal incomplete reference"); |
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312 } |
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313 goto finpcr; |
| 32 | 314 } |
| 315 | |
| 316 // anything else is 16 bit offset | |
| 317 // need 16 bit | |
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318 |
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319 l -> fsize = 2; |
| 32 | 320 *b1 = indir | 0x8D; |
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321 if (as -> passnum == 1) |
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322 v -= 3; |
| 81 | 323 *b2 = (v >> 8) & 0xff; |
| 324 *b3 = v & 0xff; | |
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325 if (as -> passnum == 2 && r == 1) |
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326 { |
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327 t = lwasm_expr_term_create_secbase(); |
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328 lwasm_expr_stack_push(l -> exprs[0], t); |
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329 lwasm_expr_term_free(t); |
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330 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS); |
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331 lwasm_expr_stack_push(l -> exprs[0], t); |
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332 lwasm_expr_term_free(t); |
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333 } |
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334 |
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335 finpcr: |
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336 if (as -> passnum == 1) |
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337 { |
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338 // need to adjust the expression |
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339 if (l -> exprs[0]) |
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340 { |
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341 t = lwasm_expr_term_create_int(as -> addr + (f8 ? 2 : 3)); |
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342 lwasm_expr_stack_push(l -> exprs[0], t); |
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343 lwasm_expr_term_free(t); |
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344 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS); |
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345 lwasm_expr_stack_push(l -> exprs[0], t); |
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346 lwasm_expr_term_free(t); |
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347 } |
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348 else |
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349 { |
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350 l -> exprvals[0] -= as -> addr + (f8 ? 2 : 3); |
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351 } |
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352 } |
| 32 | 353 return; |
| 354 } | |
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355 if (fs16) |
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356 f16 = 1; |
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357 if (fs8) |
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358 f8 = 1; |
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359 |
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360 if (f8 && r != 0) |
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361 { |
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362 register_error(as, l, 2, "Illegal external or inter-section reference"); |
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363 r = 0; |
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364 v = 0; |
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365 } |
| 32 | 366 |
| 81 | 367 // constant offset from PC (using PC as regular register :) ) |
| 368 // FIXME: handle external references intelligently | |
| 32 | 369 if (rn == 6) |
| 370 { | |
| 81 | 371 if (f8 || (!f16 && v >= -128 && v <= 127)) |
| 32 | 372 { |
| 373 *b1 = indir | 0x8C; | |
| 81 | 374 if (v < -128 || v > 127) |
| 32 | 375 register_error(as, l, 2, "Byte overflow"); |
| 81 | 376 *b2 = v & 0xff; |
| 32 | 377 return; |
| 378 } | |
| 379 | |
| 380 // everything else must be 16 bit | |
| 381 // need 16 bit | |
| 382 *b1 = indir | 0x8D; | |
| 81 | 383 *b2 = (v >> 8) & 0xff; |
| 384 *b3 = v & 0xff; | |
| 32 | 385 return; |
| 386 } | |
| 387 | |
| 388 // we only have to deal with x,y,u,s here | |
| 81 | 389 if (!f8 && !f16 && v >= -16 && v <= 15) |
| 32 | 390 { |
| 81 | 391 // zero offset going to ,R? |
| 392 if (v == 0 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE)) | |
| 32 | 393 { |
| 394 *b1 = rn << 5 | indir | 0x80 | 0x04; | |
| 395 return; | |
| 396 } | |
| 81 | 397 |
| 398 // no 5 bit on indirect | |
| 32 | 399 if (indir) |
| 400 { | |
| 401 f8 = 1; | |
| 81 | 402 l -> fsize = 1; |
| 32 | 403 goto no5bit; |
| 404 } | |
| 81 | 405 |
| 406 // 5 bit addressing | |
| 407 *b1 = rn << 5 | (v & 0x1F); | |
| 32 | 408 return; |
| 409 } | |
| 81 | 410 |
| 32 | 411 no5bit: |
| 81 | 412 if (f16 || (!f8 && (v < -128 || v > 127))) |
| 32 | 413 { |
| 414 // must be a 16 bit offset here | |
| 415 *b1 = rn << 5 | indir | 0x80 | 0x09; | |
| 81 | 416 *b2 = (v >> 8) & 0xff; |
| 417 *b3 = v & 0xff; | |
| 32 | 418 return; |
| 419 } | |
| 420 | |
| 421 // if we're here, we have an 8 bit offset | |
| 81 | 422 // note: cannot get here if incomplete reference detected above |
| 32 | 423 *b1 = rn << 5 | indir | 0x80 | 0x08; |
| 81 | 424 if (v < -128 || v > 127) |
| 32 | 425 register_error(as, l, 2, "Byte overflow"); |
| 81 | 426 *b2 = v & 0xff; |
| 32 | 427 return; |
| 428 } | |
| 429 | |
| 430 OPFUNC(insn_indexed) | |
| 431 { | |
| 432 int b1, b2, b3; | |
| 433 | |
| 434 lwasm_emitop(as, l, instab[opnum].ops[0]); | |
| 435 | |
| 436 insn_indexed_aux(as, l, (const char **)p, &b1, &b2, &b3); | |
| 437 if (b1 != -1) | |
| 438 lwasm_emit(as, l, b1); | |
| 439 if (b2 != -1) | |
| 440 lwasm_emit(as, l, b2); | |
| 441 if (b3 != -1) | |
| 442 lwasm_emit(as, l, b3); | |
| 443 } |