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/jit/stacktrace.h"
  40 #include "vm/resolve.h"
  41 #include "vm/types.h"
  42 #include "vmcore/class.h"
  43 #include "vmcore/field.h"
  44 #include "vmcore/options.h"
  45 #include "vmcore/references.h"
  46
  47 #define PATCH_BACK_ORIGINAL_MCODE \
  48         *((u2 *) pr->mpc) = (u2) pr->mcode;
  49
  50 #define PATCHER_TRACE
  51
  52
  53 /* patcher_patch_code **********************************************************
  54
  55    Just patches back the original machine code.
  56
  57 *******************************************************************************/
  58
  59 void patcher_patch_code(patchref_t *pr)
  60 {
  61         PATCH_BACK_ORIGINAL_MCODE;
  62 }
  63
  64
  65 /* patcher_get_putstatic *******************************************************
  66
  67    Machine code:
  68
  69 *******************************************************************************/
  70
  71 bool patcher_get_putstatic(patchref_t *pr)
  72 {
  73         unresolved_field *uf;
  74         u1               *datap;
  75         fieldinfo        *fi;
  76
  77         PATCHER_TRACE;
  78
  79         /* get stuff from the stack */
  80
  81         uf    = (unresolved_field *) pr->ref;
  82         datap = (u1 *)               pr->datap;
  83
  84         /* get the fieldinfo */
  85
  86         if (!(fi = resolve_field_eager(uf)))
  87                 return false;
  88
  89         /* check if the field's class is initialized */
  90
  91         if (!(fi->class->state & CLASS_INITIALIZED))
  92                 if (!initialize_class(fi->class))
  93                         return false;
  94
  95         PATCH_BACK_ORIGINAL_MCODE;
  96
  97         /* patch the field value's address */
  98
  99         *((intptr_t *) datap) = (intptr_t) fi->value;
 100
 101         return true;
 102 }
 103
 104
 105 /* patcher_get_putfield ********************************************************
 106
 107    Machine code:
 108
 109 *******************************************************************************/
 110
 111 bool patcher_get_putfield(patchref_t *pr)
 112 {
 113         u1               *ra;
 114         unresolved_field *uf;
 115         fieldinfo        *fi;
 116         s4                disp;
 117
 118         PATCHER_TRACE;
 119
 120         /* get stuff from the stack */
 121
 122         ra    = (u1 *)               pr->mpc;
 123         uf    = (unresolved_field *) pr->ref;
 124         disp  =                      pr->disp;
 125
 126         /* get the fieldinfo */
 127
 128         if (!(fi = resolve_field_eager(uf)))
 129                 return false;
 130
 131         PATCH_BACK_ORIGINAL_MCODE;
 132
 133         /* If NOPs are generated, skip them */
 134
 135         if (opt_shownops)
 136                 ra += PATCHER_NOPS_SKIP;
 137
 138         /* If there is an operand load before, skip the load size passed in disp (see ICMD_PUTFIELD) */
 139
 140         ra += disp;
 141
 142         /* patch correct offset */
 143
 144         if (fi->type == TYPE_LNG) {
 145                 ASSERT_VALID_DISP(fi->offset + 4);
 146                 /* 2 RX operations, for 2 words; each already contains a 0 or 4 offset. */
 147                 N_RX_SET_DISP(ra, fi->offset + N_RX_GET_DISP(ra));
 148                 ra += SZ_RX;
 149                 N_RX_SET_DISP(ra, fi->offset + N_RX_GET_DISP(ra));
 150         } else {
 151                 ASSERT_VALID_DISP(fi->offset);
 152                 /* 1 RX operation */
 153                 N_RX_SET_DISP(ra, fi->offset);
 154         }
 155
 156         return true;
 157 }
 158
 159 /* patcher_invokestatic_special ************************************************
 160
 161    Machine code:
 162
 163 *******************************************************************************/
 164
 165 bool patcher_invokestatic_special(patchref_t *pr)
 166 {
 167         unresolved_method *um;
 168         u1                *datap;
 169         methodinfo        *m;
 170
 171         PATCHER_TRACE;
 172
 173         /* get stuff from the stack */
 174
 175         um    = (unresolved_method *) pr->ref;
 176         datap = (u1 *)                pr->datap;
 177
 178         /* get the fieldinfo */
 179
 180         if (!(m = resolve_method_eager(um)))
 181                 return false;
 182
 183         PATCH_BACK_ORIGINAL_MCODE;
 184
 185         /* patch stubroutine */
 186
 187         *((ptrint *) datap) = (ptrint) m->stubroutine;
 188
 189         return true;
 190 }
 191
 192 /* patcher_invokevirtual *******************************************************
 193
 194    Machine code:
 195
 196 *******************************************************************************/
 197
 198 bool patcher_invokevirtual(patchref_t *pr)
 199 {
 200         u1                *ra;
 201         unresolved_method *um;
 202         methodinfo        *m;
 203         s4                 off;
 204
 205         PATCHER_TRACE;
 206
 207         /* get stuff from the stack */
 208
 209         ra    = (u1 *)                pr->mpc;
 210         um    = (unresolved_method *) pr->ref;
 211
 212         /* get the fieldinfo */
 213
 214         if (!(m = resolve_method_eager(um)))
 215                 return false;
 216
 217         /* patch back original code */
 218
 219         PATCH_BACK_ORIGINAL_MCODE;
 220
 221         /* If NOPs are generated, skip them */
 222
 223         if (opt_shownops)
 224                 ra += PATCHER_NOPS_SKIP;
 225
 226         /* patch vftbl index */
 227
 228
 229         off = (s4) (OFFSET(vftbl_t, table[0]) +
 230                                                                    sizeof(methodptr) * m->vftblindex);
 231
 232         ASSERT_VALID_DISP(off);
 233
 234         N_RX_SET_DISP(ra + SZ_RX, off);
 235
 236         return true;
 237 }
 238
 239
 240 /* patcher_invokeinterface *****************************************************
 241
 242    Machine code:
 243
 244 *******************************************************************************/
 245
 246 bool patcher_invokeinterface(patchref_t *pr)
 247 {
 248         u1                *ra;
 249         unresolved_method *um;
 250         methodinfo        *m;
 251         s4                 idx, off;
 252
 253         PATCHER_TRACE;
 254
 255         /* get stuff from the stack */
 256
 257         ra    = (u1 *)                pr->mpc;
 258         um    = (unresolved_method *) pr->ref;
 259
 260         /* get the fieldinfo */
 261
 262         if (!(m = resolve_method_eager(um)))
 263                 return false;
 264
 265         /* patch back original code */
 266
 267         PATCH_BACK_ORIGINAL_MCODE;
 268
 269         /* If NOPs are generated, skip them */
 270
 271         if (opt_shownops)
 272                 ra += PATCHER_NOPS_SKIP;
 273
 274         /* get interfacetable index */
 275
 276         idx = (s4) (OFFSET(vftbl_t, interfacetable[0]) -
 277                 sizeof(methodptr) * m->clazz->index);
 278
 279         ASSERT_VALID_IMM(idx);
 280
 281         /* get method offset */
 282
 283         off =
 284                 (s4) (sizeof(methodptr) * (m - m->clazz->methods));
 285
 286         ASSERT_VALID_DISP(off);
 287
 288         /* patch them */
 289
 290         N_RI_SET_IMM(ra + SZ_L, idx);
 291         N_RX_SET_DISP(ra + SZ_L + SZ_LHI + SZ_L, off);
 292
 293         return true;
 294 }
 295
 296
 297 /* patcher_resolve_classref_to_flags *******************************************
 298
 299    CHECKCAST/INSTANCEOF:
 300
 301    <patched call position>
 302
 303 *******************************************************************************/
 304
 305 bool patcher_resolve_classref_to_flags(patchref_t *pr)
 306 {
 307         constant_classref *cr;
 308         u1                *datap;
 309         classinfo         *c;
 310
 311         PATCHER_TRACE;
 312
 313         /* get stuff from the stack */
 314
 315         cr    = (constant_classref *) pr->ref;
 316         datap = (u1 *)                pr->datap;
 317
 318         /* get the fieldinfo */
 319
 320         if (!(c = resolve_classref_eager(cr)))
 321                 return false;
 322
 323         PATCH_BACK_ORIGINAL_MCODE;
 324
 325         /* patch class flags */
 326
 327         *((s4 *) datap) = (s4) c->flags;
 328
 329         return true;
 330 }
 331
 332 /* patcher_resolve_classref_to_classinfo ***************************************
 333
 334    ACONST:
 335    MULTIANEWARRAY:
 336    ARRAYCHECKCAST:
 337
 338 *******************************************************************************/
 339
 340 bool patcher_resolve_classref_to_classinfo(patchref_t *pr)
 341 {
 342         constant_classref *cr;
 343         u1                *datap;
 344         classinfo         *c;
 345
 346         PATCHER_TRACE;
 347
 348         /* get stuff from the stack */
 349
 350         cr    = (constant_classref *) pr->ref;
 351         datap = (u1 *)                pr->datap;
 352
 353         /* get the classinfo */
 354
 355         if (!(c = resolve_classref_eager(cr)))
 356                 return false;
 357
 358         PATCH_BACK_ORIGINAL_MCODE;
 359
 360         /* patch the classinfo pointer */
 361
 362         *((ptrint *) datap) = (ptrint) c;
 363
 364         return true;
 365 }
 366
 367 /* patcher_resolve_classref_to_vftbl *******************************************
 368
 369    CHECKCAST (class):
 370    INSTANCEOF (class):
 371
 372 *******************************************************************************/
 373
 374 bool patcher_resolve_classref_to_vftbl(patchref_t *pr)
 375 {
 376         constant_classref *cr;
 377         u1                *datap;
 378         classinfo         *c;
 379
 380         PATCHER_TRACE;
 381
 382         /* get stuff from the stack */
 383
 384         cr    = (constant_classref *) pr->ref;
 385         datap = (u1 *)                pr->datap;
 386
 387         /* get the fieldinfo */
 388
 389         if (!(c = resolve_classref_eager(cr)))
 390                 return false;
 391
 392         PATCH_BACK_ORIGINAL_MCODE;
 393
 394         /* patch super class' vftbl */
 395
 396         *((ptrint *) datap) = (ptrint) c->vftbl;
 397
 398         return true;
 399 }
 400
 401 /* patcher_checkcast_instanceof_interface **************************************
 402
 403    Machine code:
 404
 405 *******************************************************************************/
 406
 407 bool patcher_checkcast_instanceof_interface(patchref_t *pr)
 408 {
 409
 410         u1                *ra;
 411         constant_classref *cr;
 412         classinfo         *c;
 413
 414         PATCHER_TRACE;
 415
 416         /* get stuff from the stack */
 417
 418         ra    = (u1 *)                pr->mpc;
 419         cr    = (constant_classref *) pr->ref;
 420
 421         /* get the fieldinfo */
 422
 423         if (!(c = resolve_classref_eager(cr)))
 424                 return false;
 425
 426         /* patch back original code */
 427
 428         PATCH_BACK_ORIGINAL_MCODE;
 429
 430         /* If NOPs are generated, skip them */
 431
 432         if (opt_shownops)
 433                 ra += PATCHER_NOPS_SKIP;
 434
 435         /* patch super class index */
 436
 437         /* From here, split your editor and open codegen.c */
 438
 439         switch (N_RX_GET_REG(ra)) {
 440                 case REG_ITMP1:
 441                         /* First M_ALD is into ITMP1 */
 442                         /* INSTANCEOF code */
 443
 444                         N_RI_SET_IMM(ra + SZ_L + SZ_L, - c->index);
 445                         N_RI_SET_IMM(
 446                                 ra + SZ_L + SZ_L + SZ_AHI + SZ_BRC,
 447                                 (int16_t)(OFFSET(vftbl_t, interfacetable[0]) - c->index * sizeof(methodptr*))
 448                         );
 449                         break;
 450
 451                 case REG_ITMP2:
 452                         /* First M_ALD is into ITMP2 */
 453                         /* CHECKCAST code */
 454
 455                         N_RI_SET_IMM(ra + SZ_L + SZ_L, - c->index);
 456                         N_RI_SET_IMM(
 457                                 ra + SZ_L + SZ_L + SZ_AHI + SZ_BRC + SZ_ILL,
 458                                 (int16_t)(OFFSET(vftbl_t, interfacetable[0]) - c->index * sizeof(methodptr*))
 459                         );
 460                         break;
 461
 462                 default:
 463                         assert(0);
 464                         break;
 465         }
 466
 467         return true;
 468 }
 469
 470
 471 /*
 472  * These are local overrides for various environment variables in Emacs.
 473  * Please do not remove this and leave it at the end of the file, where
 474  * Emacs will automagically detect them.
 475  * ---------------------------------------------------------------------
 476  * Local variables:
 477  * mode: c
 478  * indent-tabs-mode: t
 479  * c-basic-offset: 4
 480  * tab-width: 4
 481  * End:
 482  * vim:noexpandtab:sw=4:ts=4:
 483  */