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annotate lwasm/lwasm.c @ 447:00924eeb2ec8 3.0
Fixed segfault with output outside of a section
| author | lost@l-w.ca |
|---|---|
| date | Thu, 04 Nov 2010 23:25:18 -0600 |
| parents | 4b137a8cf32a |
| children |
| rev | line source |
|---|---|
| 337 | 1 /* |
| 2 lwasm.c | |
| 3 | |
| 4 Copyright © 2010 William Astle | |
| 5 | |
| 6 This file is part of LWTOOLS. | |
| 7 | |
| 8 LWTOOLS is free software: you can redistribute it and/or modify it under the | |
| 9 terms of the GNU General Public License as published by the Free Software | |
| 10 Foundation, either version 3 of the License, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 16 more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License along with | |
| 19 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 20 */ | |
| 21 | |
|
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22 #define ___lwasm_c_seen___ |
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23 |
| 337 | 24 #include <config.h> |
| 25 | |
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26 #include <stdio.h> |
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27 #include <stdarg.h> |
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28 #include <string.h> |
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29 |
| 337 | 30 #include <lw_expr.h> |
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31 #include <lw_alloc.h> |
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32 #include <lw_string.h> |
| 337 | 33 |
| 34 #include "lwasm.h" | |
| 35 | |
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36 void lwasm_register_error(asmstate_t *as, line_t *l, const char *msg, ...); |
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37 |
| 375 | 38 int lwasm_expr_exportable(asmstate_t *as, lw_expr_t expr) |
| 39 { | |
| 40 return 0; | |
| 41 } | |
| 42 | |
| 43 int lwasm_expr_exportval(asmstate_t *as, lw_expr_t expr) | |
| 44 { | |
| 45 return 0; | |
| 46 } | |
| 47 | |
|
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48 lw_expr_t lwasm_evaluate_var(char *var, void *priv) |
| 337 | 49 { |
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50 asmstate_t *as = (asmstate_t *)priv; |
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51 lw_expr_t e; |
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52 importlist_t *im; |
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53 struct symtabe *s; |
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54 |
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55 s = lookup_symbol(as, as -> cl, var); |
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56 if (s) |
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57 { |
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58 e = lw_expr_build(lw_expr_type_special, lwasm_expr_syment, s); |
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59 return e; |
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60 } |
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61 |
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62 // undefined here is undefied unless output is object |
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63 if (as -> output_format != OUTPUT_OBJ) |
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64 goto nomatch; |
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65 |
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66 // check for import |
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67 for (im = as -> importlist; im; im = im -> next) |
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68 { |
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69 if (!strcmp(im -> symbol, var)) |
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70 break; |
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71 } |
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72 |
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73 // check for "undefined" to import automatically |
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74 if (!im && CURPRAGMA(as -> cl, PRAGMA_UNDEFEXTERN)) |
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75 { |
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76 im = lw_alloc(sizeof(importlist_t)); |
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77 im -> symbol = lw_strdup(var); |
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78 im -> next = as -> importlist; |
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79 as -> importlist = im; |
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80 } |
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81 |
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82 if (!im) |
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83 goto nomatch; |
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84 |
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85 e = lw_expr_build(lw_expr_type_special, lwasm_expr_import, im); |
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86 return e; |
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87 |
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88 nomatch: |
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89 if (as -> badsymerr) |
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90 { |
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91 lwasm_register_error(as, as -> cl, "Undefined symbol %s", var); |
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92 } |
| 337 | 93 return NULL; |
| 94 } | |
| 95 | |
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96 lw_expr_t lwasm_evaluate_special(int t, void *ptr, void *priv) |
| 337 | 97 { |
| 98 switch (t) | |
| 99 { | |
| 375 | 100 case lwasm_expr_secbase: |
| 101 { | |
| 385 | 102 // sectiontab_t *s = priv; |
| 103 asmstate_t *as = priv; | |
| 104 if (as -> exportcheck && ptr == as -> csect) | |
| 375 | 105 return lw_expr_build(lw_expr_type_int, 0); |
| 106 return NULL; | |
| 107 } | |
| 108 | |
| 337 | 109 case lwasm_expr_linelen: |
| 110 { | |
| 111 line_t *cl = ptr; | |
| 112 if (cl -> len == -1) | |
| 113 return NULL; | |
| 114 return lw_expr_build(lw_expr_type_int, cl -> len); | |
| 115 } | |
| 116 break; | |
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117 |
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118 case lwasm_expr_lineaddr: |
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119 { |
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120 line_t *cl = ptr; |
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121 if (cl -> addr) |
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122 return lw_expr_copy(cl -> addr); |
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123 else |
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124 return NULL; |
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125 } |
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126 |
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127 case lwasm_expr_syment: |
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128 { |
| 371 | 129 struct symtabe *sym = ptr; |
| 130 return lw_expr_copy(sym -> value); | |
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131 } |
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132 |
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133 case lwasm_expr_import: |
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134 { |
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135 return NULL; |
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136 } |
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137 |
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138 case lwasm_expr_nextbp: |
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139 { |
| 418 | 140 line_t *cl = ptr; |
| 141 for (cl = cl -> next; cl; cl = cl -> next) | |
| 142 { | |
| 143 if (cl -> isbrpt) | |
| 144 break; | |
| 145 } | |
| 146 if (cl) | |
| 147 { | |
| 148 return lw_expr_copy(cl -> addr); | |
| 149 } | |
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150 return NULL; |
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151 } |
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152 |
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153 case lwasm_expr_prevbp: |
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154 { |
| 418 | 155 line_t *cl = ptr; |
| 156 for (cl = cl -> prev; cl; cl = cl -> prev) | |
| 157 { | |
| 158 if (cl -> isbrpt) | |
| 159 break; | |
| 160 } | |
| 161 if (cl) | |
| 162 { | |
| 163 return lw_expr_copy(cl -> addr); | |
| 164 } | |
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165 return NULL; |
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166 } |
| 337 | 167 } |
| 168 return NULL; | |
| 169 } | |
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170 |
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171 void lwasm_register_error(asmstate_t *as, line_t *l, const char *msg, ...) |
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172 { |
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173 lwasm_error_t *e; |
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174 va_list args; |
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175 char errbuff[1024]; |
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176 int r; |
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177 |
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178 if (!l) |
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179 return; |
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180 |
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181 va_start(args, msg); |
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182 |
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183 e = lw_alloc(sizeof(lwasm_error_t)); |
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184 |
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185 e -> next = l -> err; |
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186 l -> err = e; |
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187 |
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188 as -> errorcount++; |
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189 |
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190 r = vsnprintf(errbuff, 1024, msg, args); |
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191 e -> mess = lw_strdup(errbuff); |
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192 |
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193 va_end(args); |
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194 } |
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195 |
| 351 | 196 void lwasm_register_warning(asmstate_t *as, line_t *l, const char *msg, ...) |
| 197 { | |
| 198 lwasm_error_t *e; | |
| 199 va_list args; | |
| 200 char errbuff[1024]; | |
| 201 int r; | |
| 202 | |
| 203 if (!l) | |
| 204 return; | |
| 205 | |
| 206 va_start(args, msg); | |
| 207 | |
| 208 e = lw_alloc(sizeof(lwasm_error_t)); | |
| 209 | |
| 210 e -> next = l -> err; | |
| 211 l -> err = e; | |
| 212 | |
| 213 as -> errorcount++; | |
| 214 | |
| 215 r = vsnprintf(errbuff, 1024, msg, args); | |
| 216 e -> mess = lw_strdup(errbuff); | |
| 217 | |
| 218 va_end(args); | |
| 219 } | |
| 220 | |
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221 int lwasm_next_context(asmstate_t *as) |
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222 { |
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223 int r; |
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224 r = as -> nextcontext; |
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225 as -> nextcontext++; |
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226 return r; |
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227 } |
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346
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228 |
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229 void lwasm_emit(line_t *cl, int byte) |
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230 { |
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447
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231 if (cl -> as -> output_format == OUTPUT_OBJ && cl -> csect == NULL) |
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232 { |
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233 lwasm_register_error(cl -> as, cl, "Instruction generating output outside of a section"); |
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234 return; |
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235 } |
| 374 | 236 if (cl -> outputl < 0) |
| 237 cl -> outputl = 0; | |
| 238 | |
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346
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239 if (cl -> outputl == cl -> outputbl) |
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240 { |
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241 cl -> output = lw_realloc(cl -> output, cl -> outputbl + 8); |
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242 cl -> outputbl += 8; |
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243 } |
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244 cl -> output[cl -> outputl++] = byte & 0xff; |
| 354 | 245 |
| 246 if (cl -> inmod) | |
| 247 { | |
| 248 asmstate_t *as = cl -> as; | |
| 249 // update module CRC | |
| 250 // this is a direct transliteration from the nitros9 asm source | |
| 251 // to C; it can, no doubt, be optimized for 32 bit processing | |
| 252 byte &= 0xff; | |
| 253 | |
| 254 byte ^= (as -> crc)[0]; | |
| 255 (as -> crc)[0] = (as -> crc)[1]; | |
| 256 (as -> crc)[1] = (as -> crc)[2]; | |
| 257 (as -> crc)[1] ^= (byte >> 7); | |
| 258 (as -> crc)[2] = (byte << 1); | |
| 259 (as -> crc)[1] ^= (byte >> 2); | |
| 260 (as -> crc)[2] ^= (byte << 6); | |
| 261 byte ^= (byte << 1); | |
| 262 byte ^= (byte << 2); | |
| 263 byte ^= (byte << 4); | |
| 264 if (byte & 0x80) | |
| 265 { | |
| 266 (as -> crc)[0] ^= 0x80; | |
| 267 (as -> crc)[2] ^= 0x21; | |
| 268 } | |
| 269 } | |
|
346
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270 } |
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271 |
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272 void lwasm_emitop(line_t *cl, int opc) |
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273 { |
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274 if (opc > 0x100) |
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275 lwasm_emit(cl, opc >> 8); |
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276 lwasm_emit(cl, opc); |
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277 } |
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278 |
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279 lw_expr_t lwasm_parse_term(char **p, void *priv) |
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280 { |
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281 asmstate_t *as = priv; |
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282 int val; |
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283 |
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284 if (!**p) |
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285 return NULL; |
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286 |
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287 if (**p == '*' || ( |
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288 **p == '.' |
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289 && !((*p)[1] >= 'A' && (*p)[1] <= 'Z') |
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290 && !((*p)[1] >= 'a' && (*p)[1] <= 'z') |
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291 && !((*p)[1] >= '0' && (*p)[1] <= '9') |
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292 )) |
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293 { |
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294 // special "symbol" for current line addr (*, .) |
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295 (*p)++; |
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296 return lw_expr_build(lw_expr_type_special, lwasm_expr_lineaddr, as -> cl); |
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297 } |
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298 |
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299 // branch points |
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300 if (**p == '<') |
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301 { |
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302 (*p)++; |
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303 return lw_expr_build(lw_expr_type_special, lwasm_expr_prevbp, as -> cl); |
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304 } |
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305 if (**p == '>') |
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306 { |
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307 (*p)++; |
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308 return lw_expr_build(lw_expr_type_special, lwasm_expr_nextbp, as -> cl); |
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309 } |
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310 |
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311 // double ascii constant |
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312 if (**p == '"') |
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313 { |
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314 int v; |
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315 (*p)++; |
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316 if (!**p) |
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317 return NULL; |
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318 if (!*((*p)+1)) |
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319 return NULL; |
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320 v = (unsigned char)**p << 8 | (unsigned char)*((*p)+1); |
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321 (*p) += 2; |
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322 return lw_expr_build(lw_expr_type_int, v); |
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323 } |
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324 |
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325 if (**p == '\'') |
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326 { |
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327 int v; |
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328 |
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329 (*p)++; |
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330 if (!**p) |
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331 return NULL; |
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332 |
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333 v = (unsigned char)**p; |
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334 (*p)++; |
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335 return lw_expr_build(lw_expr_type_int, v); |
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336 } |
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337 |
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338 if (**p == '&') |
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339 { |
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340 // decimal constant |
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341 int v = 0; |
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342 (*p)++; |
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343 |
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344 if (!strchr("0123456789", **p)) |
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345 return NULL; |
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346 |
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347 while (**p && strchr("0123456789", **p)) |
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348 { |
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349 val = val * 10 + (**p - '0'); |
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350 (*p)++; |
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351 } |
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352 return lw_expr_build(lw_expr_type_int, v); |
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353 } |
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354 |
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355 if (**p == '%') |
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356 { |
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357 // binary constant |
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358 int v = 0; |
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359 (*p)++; |
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360 |
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361 if (**p != '0' && **p != '1') |
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362 return NULL; |
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363 |
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364 while (**p && (**p == '0' || **p == '1')) |
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365 { |
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366 val = val * 2 + (**p - '0'); |
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367 (*p)++; |
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368 } |
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369 return lw_expr_build(lw_expr_type_int, v); |
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370 } |
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371 |
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372 if (**p == '$') |
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373 { |
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374 // hexadecimal constant |
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375 int v = 0, v2; |
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376 (*p)++; |
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377 if (!strchr("0123456789abcdefABCDEF", **p)) |
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378 return NULL; |
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379 |
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380 while (**p && strchr("0123456789abcdefABCDEF", **p)) |
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381 { |
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382 v2 = toupper(**p) - '0'; |
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383 if (v2 > 9) |
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384 v2 -= 7; |
| 382 | 385 v = v * 16 + v2; |
|
346
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386 (*p)++; |
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387 } |
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388 return lw_expr_build(lw_expr_type_int, v); |
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389 } |
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390 |
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391 if (**p == '0' && (*((*p)+1) == 'x' || *((*p)+1) == 'X')) |
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392 { |
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393 // hexadecimal constant, C style |
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394 int v = 0, v2; |
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395 (*p)+=2; |
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396 |
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397 if (!strchr("0123456789abcdefABCDEF", **p)) |
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398 return NULL; |
|
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Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
399 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
400 while (**p && strchr("0123456789abcdefABCDEF", **p)) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
401 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
402 v2 = toupper(**p) - '0'; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
403 if (v2 > 9) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
404 v2 -= 7; |
| 382 | 405 v = v * 16 + v2; |
|
346
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
406 (*p)++; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
407 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
408 return lw_expr_build(lw_expr_type_int, v); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
409 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
410 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
411 if (**p == '@' && (*((*p)+1) >= '0' && *((*p)+1) <= '7')) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
412 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
413 // octal constant |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
414 int v = 0; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
415 (*p)++; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
416 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
417 if (!strchr("01234567", **p)) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
418 return NULL; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
419 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
420 while (**p && strchr("01234567", **p)) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
421 { |
| 382 | 422 v = v * 8 + (**p - '0'); |
|
346
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
423 (*p)++; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
424 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
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diff
changeset
|
425 return lw_expr_build(lw_expr_type_int, v); |
|
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Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
426 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
427 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
428 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
429 // symbol or bare decimal or suffix constant here |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
430 do |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
431 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
432 int havedol = 0; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
433 int l = 0; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
434 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
435 while ((*p)[l] && strchr(SYMCHARS, (*p)[l])) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
436 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
437 if ((*p)[l] == '$') |
|
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Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
438 havedol = 1; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
439 l++; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
440 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
441 if (l == 0) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
442 return NULL; |
|
391
c1d83336e1d1
Fixed problem with structure member registration and fixed detection of operator{} type symbols in expression evaluation
lost@l-w.ca
parents:
387
diff
changeset
|
443 |
|
c1d83336e1d1
Fixed problem with structure member registration and fixed detection of operator{} type symbols in expression evaluation
lost@l-w.ca
parents:
387
diff
changeset
|
444 if ((*p)[l] == '{') |
|
c1d83336e1d1
Fixed problem with structure member registration and fixed detection of operator{} type symbols in expression evaluation
lost@l-w.ca
parents:
387
diff
changeset
|
445 { |
|
c1d83336e1d1
Fixed problem with structure member registration and fixed detection of operator{} type symbols in expression evaluation
lost@l-w.ca
parents:
387
diff
changeset
|
446 while ((*p)[l] && (*p)[l] != '}') |
|
c1d83336e1d1
Fixed problem with structure member registration and fixed detection of operator{} type symbols in expression evaluation
lost@l-w.ca
parents:
387
diff
changeset
|
447 l++; |
|
c1d83336e1d1
Fixed problem with structure member registration and fixed detection of operator{} type symbols in expression evaluation
lost@l-w.ca
parents:
387
diff
changeset
|
448 l++; |
|
c1d83336e1d1
Fixed problem with structure member registration and fixed detection of operator{} type symbols in expression evaluation
lost@l-w.ca
parents:
387
diff
changeset
|
449 } |
|
346
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
450 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
451 if (havedol || **p < '0' || **p > '9') |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
452 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
453 // have a symbol here |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
454 char *sym; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
455 lw_expr_t term; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
456 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
457 sym = lw_strndup(*p, l); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
458 (*p) += l; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
459 term = lw_expr_build(lw_expr_type_var, sym); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
460 lw_free(sym); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
461 return term; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
462 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
463 } while (0); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
464 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
465 if (!**p) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
466 return NULL; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
467 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
468 // we have a numeric constant here, either decimal or postfix base notation |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
469 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
470 int decval = 0, binval = 0, hexval = 0, octval = 0; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
471 int valtype = 15; // 1 = bin, 2 = oct, 4 = dec, 8 = hex |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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parents:
345
diff
changeset
|
472 int bindone = 0; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
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345
diff
changeset
|
473 int val; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
474 int dval; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
475 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
476 while (1) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
477 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
478 if (!**p || !strchr("0123456789ABCDEFabcdefqhoQHO", **p)) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
479 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
480 // we can legally be bin or decimal here |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
481 if (bindone) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
482 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
483 // just finished a binary value |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
484 val = binval; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
485 break; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
486 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
487 else if (valtype & 4) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
488 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
489 val = decval; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
490 break; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
491 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
492 else |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
493 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
494 // bad value |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
495 return NULL; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
496 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
497 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
498 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
499 dval = toupper(**p); |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
500 (*p)++; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
501 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
502 if (bindone) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
503 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
504 // any characters past "B" means it is not binary |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
505 bindone = 0; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
506 valtype &= 14; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
507 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
508 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
509 switch (dval) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
510 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
511 case 'Q': |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
512 case 'O': |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
513 if (valtype & 2) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
514 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
515 val = octval; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
516 valtype = -1; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
517 break; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
518 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
519 else |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
520 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
521 return NULL; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
522 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
523 /* can't get here */ |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
524 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
525 case 'H': |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
526 if (valtype & 8) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
527 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
528 val = hexval; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
529 valtype = -1; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
530 break; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
531 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
532 else |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
533 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
534 return NULL; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
535 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
536 /* can't get here */ |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
537 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
538 case 'B': |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
539 // this is a bit of a sticky one since B may be a |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
540 // hex number instead of the end of a binary number |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
541 // so it falls through to the digit case |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
542 if (valtype & 1) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
543 { |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
544 // could still be binary of hex |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
545 bindone = 1; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
546 valtype = 9; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
547 } |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
548 /* fall through intented */ |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
549 |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
550 default: |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
551 // digit |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
552 dval -= '0'; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
553 if (dval > 9) |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
|
554 dval -= 7; |
|
a82c55070624
Added expression parsing infrastructure and misc fixes
lost@starbug
parents:
345
diff
changeset
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555 if (valtype & 8) |
|
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556 hexval = hexval * 16 + dval; |
|
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557 if (valtype & 4) |
|
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|
558 { |
|
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559 if (dval > 9) |
|
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560 valtype &= 11; |
|
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|
561 else |
|
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|
562 decval = decval * 10 + dval; |
|
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|
563 } |
|
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564 if (valtype & 2) |
|
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565 { |
|
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|
566 if (dval > 7) |
|
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567 valtype &= 13; |
|
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568 else |
|
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|
569 octval = octval * 8 + dval; |
|
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|
570 } |
|
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571 if (valtype & 1) |
|
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572 { |
|
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573 if (dval > 1) |
|
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574 valtype &= 14; |
|
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575 else |
|
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576 binval = binval * 2 + dval; |
|
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577 } |
|
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578 } |
|
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579 if (valtype == -1) |
|
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580 break; |
|
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581 |
|
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582 // return if no more valid types |
|
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583 if (valtype == 0) |
|
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584 return NULL; |
|
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585 |
|
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586 val = decval; // in case we fall through |
|
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587 } |
|
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588 |
|
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589 // get here if we have a value |
|
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590 return lw_expr_build(lw_expr_type_int, val); |
|
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591 } |
|
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592 // can't get here |
|
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|
593 } |
|
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|
594 |
|
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595 lw_expr_t lwasm_parse_expr(asmstate_t *as, char **p) |
|
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|
596 { |
|
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597 lw_expr_t e; |
|
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598 |
|
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599 e = lw_expr_parse(p, as); |
|
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600 |
|
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601 return e; |
|
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|
602 } |
| 347 | 603 |
|
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604 int lwasm_reduce_expr(asmstate_t *as, lw_expr_t expr) |
|
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605 { |
|
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|
606 lw_expr_simplify(expr, as); |
|
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607 } |
|
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608 |
| 347 | 609 void lwasm_save_expr(line_t *cl, int id, lw_expr_t expr) |
| 610 { | |
| 611 struct line_expr_s *e; | |
| 612 | |
| 613 for (e = cl -> exprs; e; e = e -> next) | |
| 614 { | |
| 615 if (e -> id == id) | |
| 616 { | |
| 617 lw_expr_destroy(e -> expr); | |
| 618 e -> expr = expr; | |
| 619 return; | |
| 620 } | |
| 621 } | |
| 622 | |
| 623 e = lw_alloc(sizeof(struct line_expr_s)); | |
| 624 e -> expr = expr; | |
| 625 e -> id = id; | |
| 626 e -> next = cl -> exprs; | |
| 627 cl -> exprs = e; | |
| 628 } | |
| 629 | |
| 630 lw_expr_t lwasm_fetch_expr(line_t *cl, int id) | |
| 631 { | |
| 632 struct line_expr_s *e; | |
| 633 | |
| 634 for (e = cl -> exprs; e; e = e -> next) | |
| 635 { | |
| 636 if (e -> id == id) | |
| 637 { | |
| 638 return e -> expr; | |
| 639 } | |
| 640 } | |
| 641 return NULL; | |
| 642 } | |
| 643 | |
| 644 void skip_operand(char **p) | |
| 645 { | |
| 646 for (; **p && !isspace(**p); (*p)++) | |
| 647 /* do nothing */ ; | |
| 648 } | |
| 649 | |
| 650 int lwasm_emitexpr(line_t *l, lw_expr_t expr, int size) | |
| 651 { | |
|
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652 int v = 0; |
|
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653 int ol; |
| 347 | 654 |
|
416
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655 ol = l -> outputl; |
|
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656 if (ol == -1) |
|
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657 ol = 0; |
|
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658 |
| 347 | 659 if (lw_expr_istype(expr, lw_expr_type_int)) |
| 660 { | |
| 661 v = lw_expr_intval(expr); | |
| 662 } | |
|
348
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663 // handle external/cross-section/incomplete references here |
| 347 | 664 else |
| 665 { | |
| 374 | 666 if (l -> as -> output_format == OUTPUT_OBJ) |
| 667 { | |
| 668 reloctab_t *re; | |
| 376 | 669 lw_expr_t te; |
|
447
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670 |
|
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671 if (l->csect == NULL) |
|
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672 { |
|
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673 lwasm_register_error(l -> as, l, "Instruction generating output outside of a section"); |
|
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674 return -1; |
|
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675 } |
| 374 | 676 |
| 381 | 677 if (size == 4) |
| 678 { | |
| 679 // create a two part reference because lwlink doesn't | |
| 680 // support 32 bit references | |
| 681 lw_expr_t te2; | |
| 682 te = lw_expr_build(lw_expr_type_int, 0x10000); | |
| 683 te2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_divide, expr, te); | |
| 684 lw_expr_destroy(te); | |
| 685 | |
| 686 re = lw_alloc(sizeof(reloctab_t)); | |
| 687 re -> next = l -> csect -> reloctab; | |
| 688 l -> csect -> reloctab = re; | |
|
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689 te = lw_expr_build(lw_expr_type_int, ol); |
| 381 | 690 re -> offset = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, l -> addr, te); |
| 691 lw_expr_destroy(te); | |
| 692 lwasm_reduce_expr(l -> as, re -> offset); | |
| 693 re -> expr = te2; | |
| 694 re -> size = 2; | |
| 695 | |
| 696 te = lw_expr_build(lw_expr_type_int, 0xFFFF); | |
| 697 te2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_bwand, expr, te); | |
| 698 lw_expr_destroy(te); | |
| 699 | |
| 700 re = lw_alloc(sizeof(reloctab_t)); | |
| 701 re -> next = l -> csect -> reloctab; | |
| 702 l -> csect -> reloctab = re; | |
|
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703 te = lw_expr_build(lw_expr_type_int, ol + 2); |
| 381 | 704 re -> offset = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, l -> addr, te); |
| 705 lw_expr_destroy(te); | |
| 706 lwasm_reduce_expr(l -> as, re -> offset); | |
| 707 re -> expr = te2; | |
| 708 re -> size = 2; | |
| 709 } | |
| 710 else | |
| 711 { | |
| 712 // add "expression" record to section table | |
| 713 re = lw_alloc(sizeof(reloctab_t)); | |
| 714 re -> next = l -> csect -> reloctab; | |
| 715 l -> csect -> reloctab = re; | |
|
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716 te = lw_expr_build(lw_expr_type_int, ol); |
| 381 | 717 re -> offset = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, l -> addr, te); |
| 718 lw_expr_destroy(te); | |
| 719 lwasm_reduce_expr(l -> as, re -> offset); | |
| 720 re -> size = size; | |
| 721 re -> expr = lw_expr_copy(expr); | |
| 722 } | |
| 374 | 723 for (v = 0; v < size; v++) |
| 724 lwasm_emit(l, 0); | |
| 725 return 0; | |
| 726 } | |
| 347 | 727 lwasm_register_error(l -> as, l, "Expression not fully resolved"); |
| 728 return -1; | |
| 729 } | |
| 730 | |
| 731 switch (size) | |
| 732 { | |
| 733 case 4: | |
| 734 lwasm_emit(l, v >> 24); | |
| 735 lwasm_emit(l, v >> 16); | |
| 736 /* fallthrough intended */ | |
| 737 | |
| 738 case 2: | |
| 739 lwasm_emit(l, v >> 8); | |
| 740 /* fallthrough intended */ | |
| 741 | |
| 742 case 1: | |
| 743 lwasm_emit(l, v); | |
| 744 } | |
| 745 | |
| 746 return 0; | |
| 747 } | |
| 357 | 748 |
| 749 int lwasm_lookupreg2(const char *regs, char **p) | |
| 750 { | |
| 751 int rval = 0; | |
| 752 | |
| 753 while (*regs) | |
| 754 { | |
| 755 if (toupper(**p) == *regs) | |
| 756 { | |
| 757 if (regs[1] == ' ' && !isalpha(*(*p + 1))) | |
| 758 break; | |
| 759 if (toupper(*(*p + 1)) == regs[1]) | |
| 760 break; | |
| 761 } | |
| 762 regs += 2; | |
| 763 rval++; | |
| 764 } | |
| 765 if (!*regs) | |
| 766 return -1; | |
| 767 if (regs[1] == ' ') | |
| 768 (*p)++; | |
| 769 else | |
| 770 (*p) += 2; | |
| 771 return rval; | |
| 772 } | |
| 359 | 773 |
| 774 int lwasm_lookupreg3(const char *regs, char **p) | |
| 775 { | |
| 776 int rval = 0; | |
| 777 | |
| 778 while (*regs) | |
| 779 { | |
| 780 if (toupper(**p) == *regs) | |
| 781 { | |
| 782 if (regs[1] == ' ' && !isalpha(*(*p + 1))) | |
| 783 break; | |
| 784 if (toupper(*(*p + 1)) == regs[1]) | |
| 785 { | |
| 786 if (regs[2] == ' ' && !isalpha(*(*p + 2))) | |
| 787 break; | |
| 788 if (toupper(*(*p + 2)) == regs[2]) | |
| 789 break; | |
| 790 } | |
| 791 } | |
| 792 regs += 3; | |
| 793 rval++; | |
| 794 } | |
| 795 if (!*regs) | |
| 796 return -1; | |
| 797 if (regs[1] == ' ') | |
| 798 (*p)++; | |
| 799 else if (regs[2] == ' ') | |
| 800 (*p) += 2; | |
| 801 else | |
| 802 (*p) += 3; | |
| 803 return rval; | |
| 804 } | |
|
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|
805 |
|
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|
806 void lwasm_show_errors(asmstate_t *as) |
|
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|
807 { |
| 382 | 808 line_t *cl; |
| 809 lwasm_error_t *e; | |
| 810 | |
| 811 for (cl = as -> line_head; cl; cl = cl -> next) | |
| 812 { | |
| 813 if (!(cl -> err) && !(cl -> warn)) | |
| 814 continue; | |
| 815 for (e = cl -> err; e; e = e -> next) | |
| 816 { | |
| 817 fprintf(stderr, "ERROR: %s\n", e -> mess); | |
| 818 } | |
| 819 for (e = cl -> warn; e; e = e -> next) | |
| 820 { | |
| 821 fprintf(stderr, "WARNING: %s\n", e -> mess); | |
| 822 } | |
|
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|
823 fprintf(stderr, "%s:%05d %s\n\n", cl -> linespec, cl -> lineno, cl -> ltext); |
| 382 | 824 } |
|
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|
825 } |
|
387
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|
826 |
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|
827 /* |
|
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|
828 this does any passes and other gymnastics that might be useful |
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|
829 to see if an expression reduces early |
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|
830 */ |
|
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|
831 extern void do_pass3(asmstate_t *as); |
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|
832 extern void do_pass4_aux(asmstate_t *as, int force); |
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|
833 |
|
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834 void lwasm_interim_reduce(asmstate_t *as) |
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835 { |
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|
836 do_pass3(as); |
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837 // do_pass4_aux(as, 0); |
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838 } |
|
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839 |
|
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840 lw_expr_t lwasm_parse_cond(asmstate_t *as, char **p) |
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841 { |
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842 lw_expr_t e; |
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843 |
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844 debug_message(as, 250, "Parsing condition"); |
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845 e = lwasm_parse_expr(as, p); |
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846 debug_message(as, 250, "COND EXPR: %s", lw_expr_print(e)); |
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847 |
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848 if (!e) |
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849 { |
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850 lwasm_register_error(as, as -> cl, "Bad expression"); |
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851 return NULL; |
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852 } |
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853 |
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854 /* we need to simplify the expression here */ |
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855 debug_message(as, 250, "Doing interim reductions"); |
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856 lwasm_interim_reduce(as); |
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857 debug_message(as, 250, "COND EXPR: %s", lw_expr_print(e)); |
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858 debug_message(as, 250, "Reducing expression"); |
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859 lwasm_reduce_expr(as, e); |
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860 debug_message(as, 250, "COND EXPR: %s", lw_expr_print(e)); |
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861 /* lwasm_reduce_expr(as, e); |
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862 debug_message(as, 250, "COND EXPR: %s", lw_expr_print(e)); |
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863 lwasm_reduce_expr(as, e); |
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864 debug_message(as, 250, "COND EXPR: %s", lw_expr_print(e)); |
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865 lwasm_reduce_expr(as, e); |
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866 debug_message(as, 250, "COND EXPR: %s", lw_expr_print(e)); |
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867 */ |
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868 |
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869 lwasm_save_expr(as -> cl, 4242, e); |
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870 |
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871 if (!lw_expr_istype(e, lw_expr_type_int)) |
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872 { |
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873 debug_message(as, 250, "Non-constant expression"); |
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874 lwasm_register_error(as, as -> cl, "Conditions must be constant on pass 1"); |
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875 return NULL; |
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876 } |
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877 debug_message(as, 250, "Returning expression"); |
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878 return e; |
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879 } |