Colin Cross | 7bb052a | 2015-02-03 12:59:37 -0800 | [diff] [blame^] | 1 | // Derived from Inferno utils/6l/obj.c and utils/6l/span.c |
| 2 | // http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.c |
| 3 | // http://code.google.com/p/inferno-os/source/browse/utils/6l/span.c |
| 4 | // |
| 5 | // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. |
| 6 | // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) |
| 7 | // Portions Copyright © 1997-1999 Vita Nuova Limited |
| 8 | // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) |
| 9 | // Portions Copyright © 2004,2006 Bruce Ellis |
| 10 | // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) |
| 11 | // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others |
| 12 | // Portions Copyright © 2009 The Go Authors. All rights reserved. |
| 13 | // |
| 14 | // Permission is hereby granted, free of charge, to any person obtaining a copy |
| 15 | // of this software and associated documentation files (the "Software"), to deal |
| 16 | // in the Software without restriction, including without limitation the rights |
| 17 | // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 18 | // copies of the Software, and to permit persons to whom the Software is |
| 19 | // furnished to do so, subject to the following conditions: |
| 20 | // |
| 21 | // The above copyright notice and this permission notice shall be included in |
| 22 | // all copies or substantial portions of the Software. |
| 23 | // |
| 24 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 25 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 26 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 27 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 28 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 29 | // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 30 | // THE SOFTWARE. |
| 31 | |
| 32 | #include <u.h> |
| 33 | #include <libc.h> |
| 34 | #include <bio.h> |
| 35 | #include <link.h> |
| 36 | |
| 37 | void |
| 38 | mangle(char *file) |
| 39 | { |
| 40 | sysfatal("%s: mangled input file", file); |
| 41 | } |
| 42 | |
| 43 | void |
| 44 | symgrow(Link *ctxt, LSym *s, vlong lsiz) |
| 45 | { |
| 46 | int32 siz; |
| 47 | |
| 48 | USED(ctxt); |
| 49 | |
| 50 | siz = (int32)lsiz; |
| 51 | if((vlong)siz != lsiz) |
| 52 | sysfatal("symgrow size %lld too long", lsiz); |
| 53 | |
| 54 | if(s->np >= siz) |
| 55 | return; |
| 56 | |
| 57 | if(s->np > s->maxp) { |
| 58 | ctxt->cursym = s; |
| 59 | sysfatal("corrupt symbol data: np=%lld > maxp=%lld", (vlong)s->np, (vlong)s->maxp); |
| 60 | } |
| 61 | |
| 62 | if(s->maxp < siz) { |
| 63 | if(s->maxp == 0) |
| 64 | s->maxp = 8; |
| 65 | while(s->maxp < siz) |
| 66 | s->maxp <<= 1; |
| 67 | s->p = erealloc(s->p, s->maxp); |
| 68 | memset(s->p+s->np, 0, s->maxp-s->np); |
| 69 | } |
| 70 | s->np = siz; |
| 71 | } |
| 72 | |
| 73 | void |
| 74 | savedata(Link *ctxt, LSym *s, Prog *p, char *pn) |
| 75 | { |
| 76 | int32 off, siz, i, fl; |
| 77 | float32 flt; |
| 78 | uchar *cast; |
| 79 | vlong o; |
| 80 | Reloc *r; |
| 81 | |
| 82 | off = p->from.offset; |
| 83 | siz = ctxt->arch->datasize(p); |
| 84 | if(off < 0 || siz < 0 || off >= 1<<30 || siz >= 100) |
| 85 | mangle(pn); |
| 86 | if(ctxt->enforce_data_order && off < s->np) |
| 87 | ctxt->diag("data out of order (already have %d)\n%P", p); |
| 88 | symgrow(ctxt, s, off+siz); |
| 89 | |
| 90 | if(p->to.type == ctxt->arch->D_FCONST) { |
| 91 | switch(siz) { |
| 92 | default: |
| 93 | case 4: |
| 94 | flt = p->to.u.dval; |
| 95 | cast = (uchar*)&flt; |
| 96 | for(i=0; i<4; i++) |
| 97 | s->p[off+i] = cast[fnuxi4[i]]; |
| 98 | break; |
| 99 | case 8: |
| 100 | cast = (uchar*)&p->to.u.dval; |
| 101 | for(i=0; i<8; i++) |
| 102 | s->p[off+i] = cast[fnuxi8[i]]; |
| 103 | break; |
| 104 | } |
| 105 | } else if(p->to.type == ctxt->arch->D_SCONST) { |
| 106 | for(i=0; i<siz; i++) |
| 107 | s->p[off+i] = p->to.u.sval[i]; |
| 108 | } else if(p->to.type == ctxt->arch->D_CONST) { |
| 109 | if(p->to.sym) |
| 110 | goto addr; |
| 111 | o = p->to.offset; |
| 112 | fl = o; |
| 113 | cast = (uchar*)&fl; |
| 114 | switch(siz) { |
| 115 | default: |
| 116 | ctxt->diag("bad nuxi %d\n%P", siz, p); |
| 117 | break; |
| 118 | case 1: |
| 119 | s->p[off] = cast[inuxi1[0]]; |
| 120 | break; |
| 121 | case 2: |
| 122 | for(i=0; i<2; i++) |
| 123 | s->p[off+i] = cast[inuxi2[i]]; |
| 124 | break; |
| 125 | case 4: |
| 126 | for(i=0; i<4; i++) |
| 127 | s->p[off+i] = cast[inuxi4[i]]; |
| 128 | break; |
| 129 | case 8: |
| 130 | cast = (uchar*)&o; |
| 131 | for(i=0; i<8; i++) |
| 132 | s->p[off+i] = cast[inuxi8[i]]; |
| 133 | break; |
| 134 | } |
| 135 | } else if(p->to.type == ctxt->arch->D_ADDR) { |
| 136 | addr: |
| 137 | r = addrel(s); |
| 138 | r->off = off; |
| 139 | r->siz = siz; |
| 140 | r->sym = p->to.sym; |
| 141 | r->type = R_ADDR; |
| 142 | r->add = p->to.offset; |
| 143 | } else { |
| 144 | ctxt->diag("bad data: %P", p); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | Reloc* |
| 149 | addrel(LSym *s) |
| 150 | { |
| 151 | if(s->nr >= s->maxr) { |
| 152 | if(s->maxr == 0) |
| 153 | s->maxr = 4; |
| 154 | else |
| 155 | s->maxr <<= 1; |
| 156 | s->r = erealloc(s->r, s->maxr*sizeof s->r[0]); |
| 157 | memset(s->r+s->nr, 0, (s->maxr-s->nr)*sizeof s->r[0]); |
| 158 | } |
| 159 | return &s->r[s->nr++]; |
| 160 | } |
| 161 | |
| 162 | vlong |
| 163 | setuintxx(Link *ctxt, LSym *s, vlong off, uint64 v, vlong wid) |
| 164 | { |
| 165 | int32 i, fl; |
| 166 | vlong o; |
| 167 | uchar *cast; |
| 168 | |
| 169 | if(s->type == 0) |
| 170 | s->type = SDATA; |
| 171 | s->reachable = 1; |
| 172 | if(s->size < off+wid) { |
| 173 | s->size = off+wid; |
| 174 | symgrow(ctxt, s, s->size); |
| 175 | } |
| 176 | fl = v; |
| 177 | cast = (uchar*)&fl; |
| 178 | switch(wid) { |
| 179 | case 1: |
| 180 | s->p[off] = cast[inuxi1[0]]; |
| 181 | break; |
| 182 | case 2: |
| 183 | for(i=0; i<2; i++) |
| 184 | s->p[off+i] = cast[inuxi2[i]]; |
| 185 | break; |
| 186 | case 4: |
| 187 | for(i=0; i<4; i++) |
| 188 | s->p[off+i] = cast[inuxi4[i]]; |
| 189 | break; |
| 190 | case 8: |
| 191 | o = v; |
| 192 | cast = (uchar*)&o; |
| 193 | for(i=0; i<8; i++) |
| 194 | s->p[off+i] = cast[inuxi8[i]]; |
| 195 | break; |
| 196 | } |
| 197 | return off+wid; |
| 198 | } |
| 199 | |
| 200 | vlong |
| 201 | adduintxx(Link *ctxt, LSym *s, uint64 v, int wid) |
| 202 | { |
| 203 | vlong off; |
| 204 | |
| 205 | off = s->size; |
| 206 | setuintxx(ctxt, s, off, v, wid); |
| 207 | return off; |
| 208 | } |
| 209 | |
| 210 | vlong |
| 211 | adduint8(Link *ctxt, LSym *s, uint8 v) |
| 212 | { |
| 213 | return adduintxx(ctxt, s, v, 1); |
| 214 | } |
| 215 | |
| 216 | vlong |
| 217 | adduint16(Link *ctxt, LSym *s, uint16 v) |
| 218 | { |
| 219 | return adduintxx(ctxt, s, v, 2); |
| 220 | } |
| 221 | |
| 222 | vlong |
| 223 | adduint32(Link *ctxt, LSym *s, uint32 v) |
| 224 | { |
| 225 | return adduintxx(ctxt, s, v, 4); |
| 226 | } |
| 227 | |
| 228 | vlong |
| 229 | adduint64(Link *ctxt, LSym *s, uint64 v) |
| 230 | { |
| 231 | return adduintxx(ctxt, s, v, 8); |
| 232 | } |
| 233 | |
| 234 | vlong |
| 235 | setuint8(Link *ctxt, LSym *s, vlong r, uint8 v) |
| 236 | { |
| 237 | return setuintxx(ctxt, s, r, v, 1); |
| 238 | } |
| 239 | |
| 240 | vlong |
| 241 | setuint16(Link *ctxt, LSym *s, vlong r, uint16 v) |
| 242 | { |
| 243 | return setuintxx(ctxt, s, r, v, 2); |
| 244 | } |
| 245 | |
| 246 | vlong |
| 247 | setuint32(Link *ctxt, LSym *s, vlong r, uint32 v) |
| 248 | { |
| 249 | return setuintxx(ctxt, s, r, v, 4); |
| 250 | } |
| 251 | |
| 252 | vlong |
| 253 | setuint64(Link *ctxt, LSym *s, vlong r, uint64 v) |
| 254 | { |
| 255 | return setuintxx(ctxt, s, r, v, 8); |
| 256 | } |
| 257 | |
| 258 | vlong |
| 259 | addaddrplus(Link *ctxt, LSym *s, LSym *t, vlong add) |
| 260 | { |
| 261 | vlong i; |
| 262 | Reloc *r; |
| 263 | |
| 264 | if(s->type == 0) |
| 265 | s->type = SDATA; |
| 266 | s->reachable = 1; |
| 267 | i = s->size; |
| 268 | s->size += ctxt->arch->ptrsize; |
| 269 | symgrow(ctxt, s, s->size); |
| 270 | r = addrel(s); |
| 271 | r->sym = t; |
| 272 | r->off = i; |
| 273 | r->siz = ctxt->arch->ptrsize; |
| 274 | r->type = R_ADDR; |
| 275 | r->add = add; |
| 276 | return i + r->siz; |
| 277 | } |
| 278 | |
| 279 | vlong |
| 280 | addpcrelplus(Link *ctxt, LSym *s, LSym *t, vlong add) |
| 281 | { |
| 282 | vlong i; |
| 283 | Reloc *r; |
| 284 | |
| 285 | if(s->type == 0) |
| 286 | s->type = SDATA; |
| 287 | s->reachable = 1; |
| 288 | i = s->size; |
| 289 | s->size += 4; |
| 290 | symgrow(ctxt, s, s->size); |
| 291 | r = addrel(s); |
| 292 | r->sym = t; |
| 293 | r->off = i; |
| 294 | r->add = add; |
| 295 | r->type = R_PCREL; |
| 296 | r->siz = 4; |
| 297 | return i + r->siz; |
| 298 | } |
| 299 | |
| 300 | vlong |
| 301 | addaddr(Link *ctxt, LSym *s, LSym *t) |
| 302 | { |
| 303 | return addaddrplus(ctxt, s, t, 0); |
| 304 | } |
| 305 | |
| 306 | vlong |
| 307 | setaddrplus(Link *ctxt, LSym *s, vlong off, LSym *t, vlong add) |
| 308 | { |
| 309 | Reloc *r; |
| 310 | |
| 311 | if(s->type == 0) |
| 312 | s->type = SDATA; |
| 313 | s->reachable = 1; |
| 314 | if(off+ctxt->arch->ptrsize > s->size) { |
| 315 | s->size = off + ctxt->arch->ptrsize; |
| 316 | symgrow(ctxt, s, s->size); |
| 317 | } |
| 318 | r = addrel(s); |
| 319 | r->sym = t; |
| 320 | r->off = off; |
| 321 | r->siz = ctxt->arch->ptrsize; |
| 322 | r->type = R_ADDR; |
| 323 | r->add = add; |
| 324 | return off + r->siz; |
| 325 | } |
| 326 | |
| 327 | vlong |
| 328 | setaddr(Link *ctxt, LSym *s, vlong off, LSym *t) |
| 329 | { |
| 330 | return setaddrplus(ctxt, s, off, t, 0); |
| 331 | } |
| 332 | |
| 333 | vlong |
| 334 | addsize(Link *ctxt, LSym *s, LSym *t) |
| 335 | { |
| 336 | vlong i; |
| 337 | Reloc *r; |
| 338 | |
| 339 | if(s->type == 0) |
| 340 | s->type = SDATA; |
| 341 | s->reachable = 1; |
| 342 | i = s->size; |
| 343 | s->size += ctxt->arch->ptrsize; |
| 344 | symgrow(ctxt, s, s->size); |
| 345 | r = addrel(s); |
| 346 | r->sym = t; |
| 347 | r->off = i; |
| 348 | r->siz = ctxt->arch->ptrsize; |
| 349 | r->type = R_SIZE; |
| 350 | return i + r->siz; |
| 351 | } |
| 352 | |
| 353 | vlong |
| 354 | addaddrplus4(Link *ctxt, LSym *s, LSym *t, vlong add) |
| 355 | { |
| 356 | vlong i; |
| 357 | Reloc *r; |
| 358 | |
| 359 | if(s->type == 0) |
| 360 | s->type = SDATA; |
| 361 | s->reachable = 1; |
| 362 | i = s->size; |
| 363 | s->size += 4; |
| 364 | symgrow(ctxt, s, s->size); |
| 365 | r = addrel(s); |
| 366 | r->sym = t; |
| 367 | r->off = i; |
| 368 | r->siz = 4; |
| 369 | r->type = R_ADDR; |
| 370 | r->add = add; |
| 371 | return i + r->siz; |
| 372 | } |