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annotate lwasm/insn_indexed.c @ 232:1009f302ac11
Documented the "Flags" term for object files
| author | lost |
|---|---|
| date | Fri, 12 Jun 2009 04:17:22 +0000 |
| parents | 0df2a39a268c |
| children |
| rev | line source |
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| 32 | 1 /* |
| 2 insn_indexed.c | |
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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 | |
| 212 | 27 #include <config.h> |
| 28 | |
| 32 | 29 #include <ctype.h> |
| 30 #include <string.h> | |
| 31 | |
| 32 #include "lwasm.h" | |
| 33 #include "instab.h" | |
| 34 #include "expr.h" | |
| 35 | |
| 36 void insn_indexed_aux(asmstate_t *as, lwasm_line_t *l, const char **p, int *b1, int *b2, int *b3) | |
| 37 { | |
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38 struct opvals { char *opstr; int pb; }; |
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39 |
| 32 | 40 static const char *regs = "X Y U S W PCRPC "; |
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41 static const struct opvals simpleindex[] = |
| 32 | 42 { |
| 43 {",x", 0x84}, {",y", 0xa4}, {",u", 0xc4}, {",s", 0xe4}, | |
| 44 {",x+", 0x80}, {",y+", 0xa0}, {",u+", 0xc0}, {",s+", 0xe0}, | |
| 45 {",x++", 0x81}, {",y++", 0xa1}, {",u++", 0xc1}, {",s++", 0xe1}, | |
| 46 {",-x", 0x82}, {",-y", 0xa2}, {",-u", 0xc2}, {",-s", 0xe2}, | |
| 47 {",--x", 0x83}, {",--y", 0xa3}, {",--u", 0xc3}, {",--s", 0xe3}, | |
| 48 {"a,x", 0x86}, {"a,y", 0xa6}, {"a,u", 0xc6}, {"a,s", 0xe6}, | |
| 49 {"b,x", 0x85}, {"b,y", 0xa5}, {"b,u", 0xc5}, {"b,s", 0xe5}, | |
| 50 {"e,x", 0x87}, {"e,y", 0xa7}, {"e,u", 0xc7}, {"e,s", 0xe7}, | |
| 51 {"f,x", 0x8a}, {"f,y", 0xaa}, {"f,u", 0xca}, {"f,s", 0xea}, | |
| 52 {"d,x", 0x8b}, {"d,y", 0xab}, {"d,u", 0xcb}, {"d,s", 0xed}, | |
| 53 {"w,x", 0x8e}, {"w,y", 0xae}, {"w,u", 0xce}, {"w,s", 0xee}, | |
| 54 {",w", 0x8f}, {",w++", 0xcf}, {",--w", 0xef}, | |
| 55 | |
| 56 {"[,x]", 0x94}, {"[,y]", 0xb4}, {"[,u", 0xd4}, {"[,s]", 0xf4}, | |
| 57 {"[,x++]", 0x91}, {"[,y++]", 0xb1}, {"[,u++]", 0xd1}, {"[,s++]", 0xf1}, | |
| 58 {"[,--x]", 0x93}, {"[,--y]", 0xb3}, {"[,--u]", 0xd3}, {"[,--s]", 0xf3}, | |
| 59 {"[a,x]", 0x96}, {"[a,y]", 0xb6}, {"[a,u]", 0xd6}, {"[a,s]", 0xf6}, | |
| 60 {"[b,x]", 0x95}, {"[b,y]", 0xb5}, {"[b,u]", 0xd5}, {"[b,s]", 0xf5}, | |
| 61 {"[e,x]", 0x97}, {"[e,y]", 0xb7}, {"[e,u]", 0xd7}, {"[e,s]", 0xf7}, | |
| 62 {"[f,x]", 0x9a}, {"[f,y]", 0xba}, {"[f,u]", 0xda}, {"[f,s]", 0xfa}, | |
| 63 {"[d,x]", 0x9b}, {"[d,y]", 0xbb}, {"[d,u]", 0xdb}, {"[d,s]", 0xfd}, | |
| 64 {"[w,x]", 0x9e}, {"[w,y]", 0xbe}, {"[w,u]", 0xde}, {"[w,s]", 0xfe}, | |
| 65 {"[,w]", 0x90}, {"[,w++]", 0xd0}, {"[,--w]", 0xf0}, | |
| 66 | |
| 67 { "", -1 } | |
| 68 }; | |
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69 |
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70 static const char *regs9 = "X Y U S PCRPC "; |
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71 static const struct opvals simpleindex9[] = |
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72 { |
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73 {",x", 0x84}, {",y", 0xa4}, {",u", 0xc4}, {",s", 0xe4}, |
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74 {",x+", 0x80}, {",y+", 0xa0}, {",u+", 0xc0}, {",s+", 0xe0}, |
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75 {",x++", 0x81}, {",y++", 0xa1}, {",u++", 0xc1}, {",s++", 0xe1}, |
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76 {",-x", 0x82}, {",-y", 0xa2}, {",-u", 0xc2}, {",-s", 0xe2}, |
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77 {",--x", 0x83}, {",--y", 0xa3}, {",--u", 0xc3}, {",--s", 0xe3}, |
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78 {"a,x", 0x86}, {"a,y", 0xa6}, {"a,u", 0xc6}, {"a,s", 0xe6}, |
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79 {"b,x", 0x85}, {"b,y", 0xa5}, {"b,u", 0xc5}, {"b,s", 0xe5}, |
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80 {"d,x", 0x8b}, {"d,y", 0xab}, {"d,u", 0xcb}, {"d,s", 0xed}, |
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81 |
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82 {"[,x]", 0x94}, {"[,y]", 0xb4}, {"[,u", 0xd4}, {"[,s]", 0xf4}, |
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83 {"[,x++]", 0x91}, {"[,y++]", 0xb1}, {"[,u++]", 0xd1}, {"[,s++]", 0xf1}, |
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84 {"[,--x]", 0x93}, {"[,--y]", 0xb3}, {"[,--u]", 0xd3}, {"[,--s]", 0xf3}, |
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85 {"[a,x]", 0x96}, {"[a,y]", 0xb6}, {"[a,u]", 0xd6}, {"[a,s]", 0xf6}, |
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86 {"[b,x]", 0x95}, {"[b,y]", 0xb5}, {"[b,u]", 0xd5}, {"[b,s]", 0xf5}, |
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87 {"[d,x]", 0x9b}, {"[d,y]", 0xbb}, {"[d,u]", 0xdb}, {"[d,s]", 0xfd}, |
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88 |
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89 { "", -1 } |
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90 }; |
| 32 | 91 char stbuf[25]; |
| 81 | 92 int i, j, rn; |
| 93 int f8 = 0, f16 = 0, f0 = 0; | |
| 94 int r, v; | |
| 32 | 95 int indir = 0; |
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96 int fs8 = 0, fs16 = 0; |
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97 const struct opvals *simples; |
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98 const char *reglist; |
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99 |
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100 if (as -> no6309) |
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101 { |
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102 simples = simpleindex9; |
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103 reglist = regs9; |
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104 } |
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105 else |
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106 { |
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107 simples = simpleindex; |
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108 reglist = regs; |
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109 } |
| 81 | 110 |
| 111 // initialize output bytes | |
| 32 | 112 *b1 = *b2 = *b3 = -1; |
| 113 | |
| 81 | 114 // fetch out operand for lookup |
| 32 | 115 for (i = 0; i < 24; i++) |
| 116 { | |
| 117 if (*((*p) + i) && !isspace(*((*p) + i))) | |
| 118 stbuf[i] = *((*p) + i); | |
| 119 else | |
| 120 break; | |
| 121 } | |
| 122 stbuf[i] = '\0'; | |
| 81 | 123 |
| 124 // now look up operand in "simple" table | |
| 32 | 125 if (!*((*p) + i) || isspace(*((*p) + i))) |
| 126 { | |
| 127 // do simple lookup | |
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128 for (j = 0; simples[j].opstr[0]; j++) |
| 32 | 129 { |
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130 if (!strcasecmp(stbuf, simples[j].opstr)) |
| 32 | 131 break; |
| 132 } | |
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133 if (simples[j].opstr[0]) |
| 32 | 134 { |
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135 *b1 = simples[j].pb; |
| 32 | 136 (*p) += i; |
| 137 return; | |
| 138 } | |
| 139 } | |
| 81 | 140 |
| 141 // now do the "hard" ones | |
| 142 | |
| 143 // is it indirect? | |
| 32 | 144 if (**p == '[') |
| 145 { | |
| 146 indir = 1; | |
| 147 (*p)++; | |
| 148 } | |
| 149 | |
| 81 | 150 // look for a "," - all indexed modes have a "," except extended indir |
| 32 | 151 rn = 0; |
| 152 for (i = 0; (*p)[i] && !isspace((*p)[i]); i++) | |
| 153 { | |
| 154 if ((*p)[i] == ',') | |
| 155 { | |
| 156 rn = 1; | |
| 157 break; | |
| 158 } | |
| 159 } | |
| 81 | 160 |
| 161 // if no "," and indirect, do extended indir | |
| 32 | 162 if (!rn && indir) |
| 163 { | |
| 164 // extended indir | |
| 165 *b1 = 0x9f; | |
| 166 *b2 = 0; | |
| 167 *b3 = 0; | |
| 81 | 168 r = lwasm_expr_result2(as, l, (char **)p, 0, &v, 0); |
| 169 if (r < 0) | |
| 32 | 170 { |
| 171 return; | |
| 172 } | |
| 173 if (**p != ']') | |
| 174 { | |
| 175 register_error(as, l, 1, "Bad operand"); | |
| 176 return; | |
| 177 } | |
| 81 | 178 |
| 32 | 179 (*p)++; |
| 81 | 180 |
| 181 if (r == 1 && as -> passnum == 2) | |
| 32 | 182 { |
| 81 | 183 l -> relocoff = as -> addr - l -> codeaddr + 1; |
| 32 | 184 } |
| 81 | 185 |
| 186 *b2 = (v >> 8) & 0xff; | |
| 187 *b3 = v & 0xff; | |
| 32 | 188 return; |
| 189 } | |
| 190 | |
| 81 | 191 // if we've previously forced the offset size, make a note of it |
| 192 if (l -> fsize == 1) | |
| 193 f8 = 1; | |
| 194 else if (l -> fsize == 2) | |
| 195 f16 = 1; | |
| 196 | |
| 32 | 197 if (**p == '<') |
| 198 { | |
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199 fs8 = 1; |
| 32 | 200 (*p)++; |
| 201 } | |
| 202 else if (**p == '>') | |
| 203 { | |
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204 fs16 = 1; |
| 32 | 205 (*p)++; |
| 206 } | |
| 207 | |
| 208 if (**p == '0' && *(*p+1) == ',') | |
| 209 { | |
| 210 f0 = 1; | |
| 211 } | |
| 212 | |
| 213 // now we have to evaluate the expression | |
| 81 | 214 r = lwasm_expr_result2(as, l, (char **)p, 0, &v, 0); |
| 215 if (r < 0) | |
| 32 | 216 { |
| 217 return; | |
| 218 } | |
| 219 // now look for a comma; if not present, explode | |
| 220 if (*(*p)++ != ',') | |
| 221 { | |
| 222 // syntax error; force 0 bit | |
| 223 *b1 = 00; | |
| 81 | 224 l -> fsize = 0; |
| 32 | 225 return; |
| 226 } | |
| 227 | |
| 228 // now get the register | |
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229 rn = lwasm_lookupreg3(reglist, p); |
| 32 | 230 if (rn < 0) |
| 81 | 231 { |
| 232 *b1 = 0; | |
| 233 l -> fsize = 0; | |
| 234 register_error(as, l, 1, "Bad register"); | |
| 235 return; | |
| 236 } | |
| 237 | |
| 32 | 238 if (indir) |
| 239 { | |
| 240 if (**p != ']') | |
| 81 | 241 { |
| 242 register_error(as, l, 1, "Bad operand"); | |
| 243 l -> fsize = 0; | |
| 244 *b1 = 0; | |
| 245 return; | |
| 246 } | |
| 32 | 247 else |
| 248 (*p)++; | |
| 249 } | |
| 250 | |
| 81 | 251 // incomplete reference on pass 1 forces 16 bit |
| 252 if (r == 1 && as -> passnum == 1) | |
| 253 { | |
| 254 f16 = 1; | |
| 255 l -> fsize = 2; | |
| 256 } | |
| 257 | |
| 258 // incomplete reference on pass 2 needs relocoff set | |
| 259 if (r == 1 && as -> passnum == 2) | |
| 260 { | |
| 261 l -> relocoff = as -> addr - l -> codeaddr + 1; | |
| 262 } | |
| 263 | |
| 264 // nnnn,W is only 16 bit (or 0 bit) | |
| 32 | 265 if (rn == 4) |
| 266 { | |
| 267 if (f8) | |
| 81 | 268 { |
| 269 register_error(as, l, 1, "n,W cannot be 8 bit"); | |
| 270 l -> fsize = 0; | |
| 271 *b1 = 0; | |
| 272 return; | |
| 273 } | |
| 274 // note: set f16 above for incomplete references | |
| 275 // also set reloc offset | |
| 276 if (!f16 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE) && v == 0) | |
| 32 | 277 { |
| 278 if (indir) | |
| 279 *b1 = 0x90; | |
| 280 else | |
| 281 *b1 = 0x8f; | |
| 282 return; | |
| 283 } | |
| 81 | 284 |
| 32 | 285 if (indir) |
| 286 *b1 = 0xb0; | |
| 287 else | |
| 288 *b1 = 0xcf; | |
| 81 | 289 *b2 = (v >> 8) & 0xff; |
| 290 *b3 = v & 0xff; | |
| 32 | 291 return; |
| 292 } | |
| 293 | |
| 81 | 294 // set indir to correct bit value |
| 32 | 295 if (indir) indir = 0x10; |
| 296 | |
| 81 | 297 // PCR? then we have PC relative addressing (like B??, LB??) |
| 32 | 298 if (rn == 5) |
| 299 { | |
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300 lwasm_expr_term_t *t; |
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301 // external references are handled exactly the same as for |
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302 // relative addressing modes |
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303 // on pass 1, adjust the expression for a subtraction of the |
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304 // current address |
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305 |
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306 // need to re-evaluate the expression with "SECTCONST"... |
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307 r = lwasm_expr_result2(as, l, (char **)p, EXPR_SECTCONST | EXPR_REEVAL, &v, 0); |
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308 if (r != 0) |
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309 v = 0; |
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310 if (as -> passnum == 1) |
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311 { |
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312 l -> fsize = 0; |
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313 } |
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314 f8 = f16 = 0; |
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315 if (r == 1 && as -> passnum == 1 && !fs8) |
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316 { |
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317 l -> fsize = 2; |
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318 f16 = 1; |
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319 } |
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320 if (fs8) |
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321 f8 = 1; |
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322 if (fs16) |
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323 f16 = 1; |
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324 if (l -> fsize == 2) |
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325 f16 = 1; |
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326 else if (l -> fsize == 1) |
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327 f8 = 1; |
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328 if (as -> passnum == 1) |
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329 v -= as -> addr; |
| 32 | 330 |
| 331 // we have a slight problem here | |
| 332 // PCR based on current insn loc is really | |
| 333 // -125 <= offset <= +130 (8 bit offset) | |
| 334 // NOTE: when we are called, we already have the opcode emitted | |
| 335 // so we only need to worry about the size of the operand | |
| 336 // hence the 2 and 3 magic numbers below instead of 3 and 4 | |
| 337 // (and that also avoids errors with two byte opcodes, etc) | |
| 81 | 338 if (f8 || (!f16 && v >= -125 && v <= 130)) |
| 32 | 339 { |
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340 f8 = 1; |
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341 l -> fsize = 1; |
| 32 | 342 *b1 = indir | 0x8C; |
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343 if (as -> passnum == 1) |
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344 v -= 2; |
| 81 | 345 if (v < -128 || v > 127) |
| 32 | 346 register_error(as, l, 2, "Byte overflow"); |
| 81 | 347 *b2 = v & 0xff; |
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348 if (r != 0 && as -> passnum == 2) |
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349 { |
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350 register_error(as, l, 2, "Illegal incomplete reference"); |
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351 } |
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352 goto finpcr; |
| 32 | 353 } |
| 354 | |
| 355 // anything else is 16 bit offset | |
| 356 // need 16 bit | |
|
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357 |
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358 l -> fsize = 2; |
| 32 | 359 *b1 = indir | 0x8D; |
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360 if (as -> passnum == 1) |
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361 v -= 3; |
| 81 | 362 *b2 = (v >> 8) & 0xff; |
| 363 *b3 = v & 0xff; | |
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364 if (as -> passnum == 2 && r == 1) |
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365 { |
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366 t = lwasm_expr_term_create_secbase(); |
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367 lwasm_expr_stack_push(l -> exprs[0], t); |
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368 lwasm_expr_term_free(t); |
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369 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS); |
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370 lwasm_expr_stack_push(l -> exprs[0], t); |
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371 lwasm_expr_term_free(t); |
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372 } |
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373 |
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374 finpcr: |
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375 if (as -> passnum == 1) |
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376 { |
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377 // need to adjust the expression |
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378 if (l -> exprs[0]) |
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379 { |
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380 t = lwasm_expr_term_create_int(as -> addr + (f8 ? 2 : 3)); |
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381 lwasm_expr_stack_push(l -> exprs[0], t); |
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382 lwasm_expr_term_free(t); |
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383 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS); |
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384 lwasm_expr_stack_push(l -> exprs[0], t); |
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385 lwasm_expr_term_free(t); |
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386 } |
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387 else |
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388 { |
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389 l -> exprvals[0] -= as -> addr + (f8 ? 2 : 3); |
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390 } |
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391 } |
| 32 | 392 return; |
| 393 } | |
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394 if (fs16) |
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395 f16 = 1; |
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396 if (fs8) |
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397 f8 = 1; |
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398 |
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399 if (f8 && r != 0) |
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400 { |
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401 register_error(as, l, 2, "Illegal external or inter-section reference"); |
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402 r = 0; |
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403 v = 0; |
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404 } |
| 32 | 405 |
| 81 | 406 // constant offset from PC (using PC as regular register :) ) |
| 407 // FIXME: handle external references intelligently | |
| 32 | 408 if (rn == 6) |
| 409 { | |
| 81 | 410 if (f8 || (!f16 && v >= -128 && v <= 127)) |
| 32 | 411 { |
| 412 *b1 = indir | 0x8C; | |
| 81 | 413 if (v < -128 || v > 127) |
| 32 | 414 register_error(as, l, 2, "Byte overflow"); |
| 81 | 415 *b2 = v & 0xff; |
| 32 | 416 return; |
| 417 } | |
| 418 | |
| 419 // everything else must be 16 bit | |
| 420 // need 16 bit | |
| 421 *b1 = indir | 0x8D; | |
| 81 | 422 *b2 = (v >> 8) & 0xff; |
| 423 *b3 = v & 0xff; | |
| 32 | 424 return; |
| 425 } | |
| 426 | |
| 427 // we only have to deal with x,y,u,s here | |
| 81 | 428 if (!f8 && !f16 && v >= -16 && v <= 15) |
| 32 | 429 { |
| 81 | 430 // zero offset going to ,R? |
| 431 if (v == 0 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE)) | |
| 32 | 432 { |
| 433 *b1 = rn << 5 | indir | 0x80 | 0x04; | |
| 434 return; | |
| 435 } | |
| 81 | 436 |
| 437 // no 5 bit on indirect | |
| 32 | 438 if (indir) |
| 439 { | |
| 440 f8 = 1; | |
| 81 | 441 l -> fsize = 1; |
| 32 | 442 goto no5bit; |
| 443 } | |
| 81 | 444 |
| 445 // 5 bit addressing | |
| 446 *b1 = rn << 5 | (v & 0x1F); | |
| 32 | 447 return; |
| 448 } | |
| 81 | 449 |
| 32 | 450 no5bit: |
| 81 | 451 if (f16 || (!f8 && (v < -128 || v > 127))) |
| 32 | 452 { |
| 453 // must be a 16 bit offset here | |
| 454 *b1 = rn << 5 | indir | 0x80 | 0x09; | |
| 81 | 455 *b2 = (v >> 8) & 0xff; |
| 456 *b3 = v & 0xff; | |
| 32 | 457 return; |
| 458 } | |
| 459 | |
| 460 // if we're here, we have an 8 bit offset | |
| 81 | 461 // note: cannot get here if incomplete reference detected above |
| 32 | 462 *b1 = rn << 5 | indir | 0x80 | 0x08; |
| 81 | 463 if (v < -128 || v > 127) |
| 32 | 464 register_error(as, l, 2, "Byte overflow"); |
| 81 | 465 *b2 = v & 0xff; |
| 32 | 466 return; |
| 467 } | |
| 468 | |
| 469 OPFUNC(insn_indexed) | |
| 470 { | |
| 471 int b1, b2, b3; | |
| 472 | |
| 473 lwasm_emitop(as, l, instab[opnum].ops[0]); | |
| 474 | |
| 475 insn_indexed_aux(as, l, (const char **)p, &b1, &b2, &b3); | |
| 476 if (b1 != -1) | |
| 477 lwasm_emit(as, l, b1); | |
| 478 if (b2 != -1) | |
| 479 lwasm_emit(as, l, b2); | |
| 480 if (b3 != -1) | |
| 481 lwasm_emit(as, l, b3); | |
| 482 } |