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