src/vm/jit/s390/patcher.c

   1 /* src/vm/jit/s390/patcher.c - s390 code patching functions
   2
   3    Copyright (C) 2006, 2007, 2008
   4    CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
   5
   6    This file is part of CACAO.
   7
   8    This program is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2, or (at
  11    your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22
  23 */
  24
  25
  26 #include "config.h"
  27
  28 #include <assert.h>
  29 #include <stdint.h>
  30
  31 #include "mm/memory.h"
  32 #include "native/native.h"
  33 #include "vm/builtin.h"
  34 #include "vm/exceptions.h"
  35 #include "vm/initialize.h"
  36 #include "vm/jit/patcher-common.h"
  37 #include "vm/jit/s390/codegen.h"
  38 #include "vm/jit/s390/md-abi.h"
  39 #include "vm/resolve.h"
  40 #include "vm/types.h"
  41 #include "vmcore/class.h"
  42 #include "vmcore/field.h"
  43 #include "vmcore/options.h"
  44 #include "vmcore/references.h"
  45
  46 #define PATCH_BACK_ORIGINAL_MCODE \
  47         *((u2 *) pr->mpc) = (u2) pr->mcode;
  48
  49 #define PATCHER_TRACE
  50
  51
  52 /* patcher_patch_code **********************************************************
  53
  54    Just patches back the original machine code.
  55
  56 *******************************************************************************/
  57
  58 void patcher_patch_code(patchref_t *pr)
  59 {
  60         PATCH_BACK_ORIGINAL_MCODE;
  61 }
  62
  63
  64 /* patcher_get_putstatic *******************************************************
  65
  66    Machine code:
  67
  68 *******************************************************************************/
  69
  70 bool patcher_get_putstatic(patchref_t *pr)
  71 {
  72         unresolved_field *uf;
  73         u1               *datap;
  74         fieldinfo        *fi;
  75
  76         PATCHER_TRACE;
  77
  78         /* get stuff from the stack */
  79
  80         uf    = (unresolved_field *) pr->ref;
  81         datap = (u1 *)               pr->datap;
  82
  83         /* get the fieldinfo */
  84
  85         if (!(fi = resolve_field_eager(uf)))
  86                 return false;
  87
  88         /* check if the field's class is initialized */
  89
  90         if (!(fi->clazz->state & CLASS_INITIALIZED))
  91                 if (!initialize_class(fi->clazz))
  92                         return false;
  93
  94         PATCH_BACK_ORIGINAL_MCODE;
  95
  96         /* patch the field value's address */
  97
  98         *((intptr_t *) datap) = (intptr_t) fi->value;
  99
 100         return true;
 101 }
 102
 103
 104 /* patcher_get_putfield ********************************************************
 105
 106    Machine code:
 107
 108 *******************************************************************************/
 109
 110 bool patcher_get_putfield(patchref_t *pr)
 111 {
 112         u1               *ra;
 113         unresolved_field *uf;
 114         fieldinfo        *fi;
 115         s4                disp;
 116
 117         PATCHER_TRACE;
 118
 119         /* get stuff from the stack */
 120
 121         ra    = (u1 *)               pr->mpc;
 122         uf    = (unresolved_field *) pr->ref;
 123         disp  =                      pr->disp;
 124
 125         /* get the fieldinfo */
 126
 127         if (!(fi = resolve_field_eager(uf)))
 128                 return false;
 129
 130         PATCH_BACK_ORIGINAL_MCODE;
 131
 132         /* If NOPs are generated, skip them */
 133
 134         if (opt_shownops)
 135                 ra += PATCHER_NOPS_SKIP;
 136
 137         /* If there is an operand load before, skip the load size passed in disp (see ICMD_PUTFIELD) */
 138
 139         ra += disp;
 140
 141         /* patch correct offset */
 142
 143         if (fi->type == TYPE_LNG) {
 144                 ASSERT_VALID_DISP(fi->offset + 4);
 145                 /* 2 RX operations, for 2 words; each already contains a 0 or 4 offset. */
 146                 N_RX_SET_DISP(ra, fi->offset + N_RX_GET_DISP(ra));
 147                 ra += SZ_RX;
 148                 N_RX_SET_DISP(ra, fi->offset + N_RX_GET_DISP(ra));
 149         } else {
 150                 ASSERT_VALID_DISP(fi->offset);
 151                 /* 1 RX operation */
 152                 N_RX_SET_DISP(ra, fi->offset);
 153         }
 154
 155         return true;
 156 }
 157
 158 /* patcher_invokestatic_special ************************************************
 159
 160    Machine code:
 161
 162 *******************************************************************************/
 163
 164 bool patcher_invokestatic_special(patchref_t *pr)
 165 {
 166         unresolved_method *um;
 167         u1                *datap;
 168         methodinfo        *m;
 169
 170         PATCHER_TRACE;
 171
 172         /* get stuff from the stack */
 173
 174         um    = (unresolved_method *) pr->ref;
 175         datap = (u1 *)                pr->datap;
 176
 177         /* get the fieldinfo */
 178
 179         if (!(m = resolve_method_eager(um)))
 180                 return false;
 181
 182         PATCH_BACK_ORIGINAL_MCODE;
 183
 184         /* patch stubroutine */
 185
 186         *((ptrint *) datap) = (ptrint) m->stubroutine;
 187
 188         return true;
 189 }
 190
 191 /* patcher_invokevirtual *******************************************************
 192
 193    Machine code:
 194
 195 *******************************************************************************/
 196
 197 bool patcher_invokevirtual(patchref_t *pr)
 198 {
 199         u1                *ra;
 200         unresolved_method *um;
 201         methodinfo        *m;
 202         s4                 off;
 203
 204         PATCHER_TRACE;
 205
 206         /* get stuff from the stack */
 207
 208         ra    = (u1 *)                pr->mpc;
 209         um    = (unresolved_method *) pr->ref;
 210
 211         /* get the fieldinfo */
 212
 213         if (!(m = resolve_method_eager(um)))
 214                 return false;
 215
 216         /* patch back original code */
 217
 218         PATCH_BACK_ORIGINAL_MCODE;
 219
 220         /* If NOPs are generated, skip them */
 221
 222         if (opt_shownops)
 223                 ra += PATCHER_NOPS_SKIP;
 224
 225         /* patch vftbl index */
 226
 227
 228         off = (s4) (OFFSET(vftbl_t, table[0]) +
 229                                                                    sizeof(methodptr) * m->vftblindex);
 230
 231         ASSERT_VALID_DISP(off);
 232
 233         N_RX_SET_DISP(ra + SZ_RX, off);
 234
 235         return true;
 236 }
 237
 238
 239 /* patcher_invokeinterface *****************************************************
 240
 241    Machine code:
 242
 243 *******************************************************************************/
 244
 245 bool patcher_invokeinterface(patchref_t *pr)
 246 {
 247         u1                *ra;
 248         unresolved_method *um;
 249         methodinfo        *m;
 250         s4                 idx, off;
 251
 252         PATCHER_TRACE;
 253
 254         /* get stuff from the stack */
 255
 256         ra    = (u1 *)                pr->mpc;
 257         um    = (unresolved_method *) pr->ref;
 258
 259         /* get the fieldinfo */
 260
 261         if (!(m = resolve_method_eager(um)))
 262                 return false;
 263
 264         /* patch back original code */
 265
 266         PATCH_BACK_ORIGINAL_MCODE;
 267
 268         /* If NOPs are generated, skip them */
 269
 270         if (opt_shownops)
 271                 ra += PATCHER_NOPS_SKIP;
 272
 273         /* get interfacetable index */
 274
 275         idx = (s4) (OFFSET(vftbl_t, interfacetable[0]) -
 276                 sizeof(methodptr) * m->clazz->index);
 277
 278         ASSERT_VALID_IMM(idx);
 279
 280         /* get method offset */
 281
 282         off =
 283                 (s4) (sizeof(methodptr) * (m - m->clazz->methods));
 284
 285         ASSERT_VALID_DISP(off);
 286
 287         /* patch them */
 288
 289         N_RI_SET_IMM(ra + SZ_L, idx);
 290         N_RX_SET_DISP(ra + SZ_L + SZ_LHI + SZ_L, off);
 291
 292         return true;
 293 }
 294
 295
 296 /* patcher_resolve_classref_to_flags *******************************************
 297
 298    CHECKCAST/INSTANCEOF:
 299
 300    <patched call position>
 301
 302 *******************************************************************************/
 303
 304 bool patcher_resolve_classref_to_flags(patchref_t *pr)
 305 {
 306         constant_classref *cr;
 307         u1                *datap;
 308         classinfo         *c;
 309
 310         PATCHER_TRACE;
 311
 312         /* get stuff from the stack */
 313
 314         cr    = (constant_classref *) pr->ref;
 315         datap = (u1 *)                pr->datap;
 316
 317         /* get the fieldinfo */
 318
 319         if (!(c = resolve_classref_eager(cr)))
 320                 return false;
 321
 322         PATCH_BACK_ORIGINAL_MCODE;
 323
 324         /* patch class flags */
 325
 326         *((s4 *) datap) = (s4) c->flags;
 327
 328         return true;
 329 }
 330
 331 /* patcher_resolve_classref_to_classinfo ***************************************
 332
 333    ACONST:
 334    MULTIANEWARRAY:
 335    ARRAYCHECKCAST:
 336
 337 *******************************************************************************/
 338
 339 bool patcher_resolve_classref_to_classinfo(patchref_t *pr)
 340 {
 341         constant_classref *cr;
 342         u1                *datap;
 343         classinfo         *c;
 344
 345         PATCHER_TRACE;
 346
 347         /* get stuff from the stack */
 348
 349         cr    = (constant_classref *) pr->ref;
 350         datap = (u1 *)                pr->datap;
 351
 352         /* get the classinfo */
 353
 354         if (!(c = resolve_classref_eager(cr)))
 355                 return false;
 356
 357         PATCH_BACK_ORIGINAL_MCODE;
 358
 359         /* patch the classinfo pointer */
 360
 361         *((ptrint *) datap) = (ptrint) c;
 362
 363         return true;
 364 }
 365
 366 /* patcher_resolve_classref_to_vftbl *******************************************
 367
 368    CHECKCAST (class):
 369    INSTANCEOF (class):
 370
 371 *******************************************************************************/
 372
 373 bool patcher_resolve_classref_to_vftbl(patchref_t *pr)
 374 {
 375         constant_classref *cr;
 376         u1                *datap;
 377         classinfo         *c;
 378
 379         PATCHER_TRACE;
 380
 381         /* get stuff from the stack */
 382
 383         cr    = (constant_classref *) pr->ref;
 384         datap = (u1 *)                pr->datap;
 385
 386         /* get the fieldinfo */
 387
 388         if (!(c = resolve_classref_eager(cr)))
 389                 return false;
 390
 391         PATCH_BACK_ORIGINAL_MCODE;
 392
 393         /* patch super class' vftbl */
 394
 395         *((ptrint *) datap) = (ptrint) c->vftbl;
 396
 397         return true;
 398 }
 399
 400 /* patcher_checkcast_instanceof_interface **************************************
 401
 402    Machine code:
 403
 404 *******************************************************************************/
 405
 406 bool patcher_checkcast_instanceof_interface(patchref_t *pr)
 407 {
 408
 409         u1                *ra;
 410         constant_classref *cr;
 411         classinfo         *c;
 412
 413         PATCHER_TRACE;
 414
 415         /* get stuff from the stack */
 416
 417         ra    = (u1 *)                pr->mpc;
 418         cr    = (constant_classref *) pr->ref;
 419
 420         /* get the fieldinfo */
 421
 422         if (!(c = resolve_classref_eager(cr)))
 423                 return false;
 424
 425         /* patch back original code */
 426
 427         PATCH_BACK_ORIGINAL_MCODE;
 428
 429         /* If NOPs are generated, skip them */
 430
 431         if (opt_shownops)
 432                 ra += PATCHER_NOPS_SKIP;
 433
 434         /* patch super class index */
 435
 436         /* From here, split your editor and open codegen.c */
 437
 438         switch (N_RX_GET_REG(ra)) {
 439                 case REG_ITMP1:
 440                         /* First M_ALD is into ITMP1 */
 441                         /* INSTANCEOF code */
 442
 443                         N_RI_SET_IMM(ra + SZ_L + SZ_L, - c->index);
 444                         N_RI_SET_IMM(
 445                                 ra + SZ_L + SZ_L + SZ_AHI + SZ_BRC,
 446                                 (int16_t)(OFFSET(vftbl_t, interfacetable[0]) - c->index * sizeof(methodptr*))
 447                         );
 448                         break;
 449
 450                 case REG_ITMP2:
 451                         /* First M_ALD is into ITMP2 */
 452                         /* CHECKCAST code */
 453
 454                         N_RI_SET_IMM(ra + SZ_L + SZ_L, - c->index);
 455                         N_RI_SET_IMM(
 456                                 ra + SZ_L + SZ_L + SZ_AHI + SZ_BRC + SZ_ILL,
 457                                 (int16_t)(OFFSET(vftbl_t, interfacetable[0]) - c->index * sizeof(methodptr*))
 458                         );
 459                         break;
 460
 461                 default:
 462                         assert(0);
 463                         break;
 464         }
 465
 466         return true;
 467 }
 468
 469
 470 /*
 471  * These are local overrides for various environment variables in Emacs.
 472  * Please do not remove this and leave it at the end of the file, where
 473  * Emacs will automagically detect them.
 474  * ---------------------------------------------------------------------
 475  * Local variables:
 476  * mode: c
 477  * indent-tabs-mode: t
 478  * c-basic-offset: 4
 479  * tab-width: 4
 480  * End:
 481  * vim:noexpandtab:sw=4:ts=4:
 482  */