src/vm/jit/x86_64/linux/md-os.c

   1 /* src/vm/jit/x86_64/linux/md-os.c - machine dependent x86_64 Linux functions
   2
   3    Copyright (C) 2007 R. Grafl, A. Krall, C. Kruegel,
   4    C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
   5    E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
   6    J. Wenninger, Institut f. Computersprachen - TU Wien
   7
   8    This file is part of CACAO.
   9
  10    This program is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU General Public License as
  12    published by the Free Software Foundation; either version 2, or (at
  13    your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful, but
  16    WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  23    02110-1301, USA.
  24
  25 */
  26
  27
  28 #define _GNU_SOURCE
  29
  30 #include "config.h"
  31
  32 #include <assert.h>
  33 #include <stdint.h>
  34 #include <stdlib.h>
  35 #include <ucontext.h>
  36
  37 #include "vm/types.h"
  38
  39 #include "vm/jit/x86_64/codegen.h"
  40 #include "vm/jit/x86_64/md.h"
  41
  42 #if defined(ENABLE_THREADS)
  43 # include "threads/native/threads.h"
  44 #endif
  45
  46 #include "vm/builtin.h"
  47 #include "vm/exceptions.h"
  48 #include "vm/signallocal.h"
  49
  50 #include "vm/jit/asmpart.h"
  51 #include "vm/jit/stacktrace.h"
  52
  53
  54 /* md_signal_handler_sigsegv ***************************************************
  55
  56    Signal handler for hardware exception.
  57
  58 *******************************************************************************/
  59
  60 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
  61 {
  62         ucontext_t     *_uc;
  63         mcontext_t     *_mc;
  64         void           *pv;
  65         u1             *sp;
  66         u1             *ra;
  67         u1             *xpc;
  68         u1              opc;
  69         u1              mod;
  70         u1              rm;
  71         s4              d;
  72         s4              disp;
  73         int             type;
  74         intptr_t        val;
  75         void           *p;
  76         java_object_t  *o;
  77
  78         _uc = (ucontext_t *) _p;
  79         _mc = &_uc->uc_mcontext;
  80
  81         /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
  82            different to the ones in <ucontext.h>. */
  83
  84         pv  = NULL;                 /* is resolved during stackframeinfo creation */
  85         sp  = (u1 *) _mc->gregs[REG_RSP];
  86         xpc = (u1 *) _mc->gregs[REG_RIP];
  87         ra  = xpc;                              /* return address is equal to XPC */
  88
  89 #if 0
  90         /* check for StackOverflowException */
  91
  92         threads_check_stackoverflow(sp);
  93 #endif
  94
  95         /* get exception-throwing instruction */
  96
  97         opc = M_ALD_MEM_GET_OPC(xpc);
  98         mod = M_ALD_MEM_GET_MOD(xpc);
  99         rm  = M_ALD_MEM_GET_RM(xpc);
 100
 101         /* for values see emit_mov_mem_reg and emit_mem */
 102
 103         if ((opc == 0x8b) && (mod == 0) && (rm == 4)) {
 104                 /* this was a hardware-exception */
 105
 106                 d    = M_ALD_MEM_GET_REG(xpc);
 107                 disp = M_ALD_MEM_GET_DISP(xpc);
 108
 109                 /* we use the exception type as load displacement */
 110
 111                 type = disp;
 112
 113                 /* XXX FIX ME! */
 114
 115                 /* ATTENTION: The _mc->gregs layout is even worse than on
 116                    i386! See /usr/include/sys/ucontext.h.  We need a
 117                    switch-case here... */
 118
 119                 switch (d) {
 120                 case 0:  /* REG_RAX == 13 */
 121                         d = REG_RAX;
 122                         break;
 123                 case 1:  /* REG_RCX == 14 */
 124                         d = REG_RCX;
 125                         break;
 126                 case 2:  /* REG_RDX == 12 */
 127                         d = REG_RDX;
 128                         break;
 129                 case 3:  /* REG_RBX == 11 */
 130                         d = REG_RBX;
 131                         break;
 132                 case 4:  /* REG_RSP == 15 */
 133                         d = REG_RSP;
 134                         break;
 135                 case 5:  /* REG_RBP == 10 */
 136                         d = REG_RBP;
 137                         break;
 138                 case 6:  /* REG_RSI == 9  */
 139                         d = REG_RSI;
 140                         break;
 141                 case 7:  /* REG_RDI == 8  */
 142                         d = REG_RDI;
 143                         break;
 144                 case 8:  /* REG_R8  == 0  */
 145                 case 9:  /* REG_R9  == 1  */
 146                 case 10: /* REG_R10 == 2  */
 147                 case 11: /* REG_R11 == 3  */
 148                 case 12: /* REG_R12 == 4  */
 149                 case 13: /* REG_R13 == 5  */
 150                 case 14: /* REG_R14 == 6  */
 151                 case 15: /* REG_R15 == 7  */
 152                         d = d - 8;
 153                         break;
 154                 }
 155
 156                 val = _mc->gregs[d];
 157
 158                 if (type == EXCEPTION_HARDWARE_COMPILER) {
 159                         /* The PV from the compiler stub is equal to the XPC. */
 160
 161                         pv = xpc;
 162
 163                         /* We use a framesize of zero here because the call pushed
 164                            the return addres onto the stack. */
 165
 166                         ra = md_stacktrace_get_returnaddress(sp, 0);
 167
 168                         /* Skip the RA on the stack. */
 169
 170                         sp = sp + 1 * SIZEOF_VOID_P;
 171
 172                         /* The XPC is the RA minus 1, because the RA points to the
 173                            instruction after the call. */
 174
 175                         xpc = ra - 3;
 176                 }
 177         }
 178         else {
 179                 /* this was a normal NPE */
 180
 181                 type = EXCEPTION_HARDWARE_NULLPOINTER;
 182                 val  = 0;
 183         }
 184
 185         /* Handle the type. */
 186
 187         p = signal_handle(type, val, pv, sp, ra, xpc, _p);
 188
 189         /* Set registers. */
 190
 191         if (type == EXCEPTION_HARDWARE_COMPILER) {
 192                 if (p == NULL) {
 193                         o = builtin_retrieve_exception();
 194
 195                         _mc->gregs[REG_RSP] = (uintptr_t) sp;    /* Remove RA from stack. */
 196
 197                         _mc->gregs[REG_RAX] = (uintptr_t) o;
 198                         _mc->gregs[REG_R10] = (uintptr_t) xpc;           /* REG_ITMP2_XPC */
 199                         _mc->gregs[REG_RIP] = (uintptr_t) asm_handle_exception;
 200                 }
 201                 else {
 202                         _mc->gregs[REG_RIP] = (uintptr_t) p;
 203                 }
 204         }
 205         else {
 206                 _mc->gregs[REG_RAX] = (uintptr_t) p;
 207                 _mc->gregs[REG_R10] = (uintptr_t) xpc;               /* REG_ITMP2_XPC */
 208                 _mc->gregs[REG_RIP] = (uintptr_t) asm_handle_exception;
 209         }
 210 }
 211
 212
 213 /* md_signal_handler_sigfpe ****************************************************
 214
 215    ArithmeticException signal handler for hardware divide by zero
 216    check.
 217
 218 *******************************************************************************/
 219
 220 void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
 221 {
 222         ucontext_t     *_uc;
 223         mcontext_t     *_mc;
 224         u1             *pv;
 225         u1             *sp;
 226         u1             *ra;
 227         u1             *xpc;
 228         int             type;
 229         intptr_t        val;
 230         void           *p;
 231
 232         _uc = (ucontext_t *) _p;
 233         _mc = &_uc->uc_mcontext;
 234
 235         /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
 236            different to the ones in <ucontext.h>. */
 237
 238         pv  = NULL;
 239         sp  = (u1 *) _mc->gregs[REG_RSP];
 240         xpc = (u1 *) _mc->gregs[REG_RIP];
 241         ra  = xpc;                          /* return address is equal to xpc     */
 242
 243         /* this is an ArithmeticException */
 244
 245         type = EXCEPTION_HARDWARE_ARITHMETIC;
 246         val  = 0;
 247
 248         /* Handle the type. */
 249
 250         p = signal_handle(type, val, pv, sp, ra, xpc, _p);
 251
 252         /* set registers */
 253
 254         _mc->gregs[REG_RAX] = (intptr_t) p;
 255         _mc->gregs[REG_R10] = (intptr_t) xpc;                    /* REG_ITMP2_XPC */
 256         _mc->gregs[REG_RIP] = (intptr_t) asm_handle_exception;
 257 }
 258
 259
 260 /* md_signal_handler_sigill ****************************************************
 261
 262    Signal handler for patchers.
 263
 264 *******************************************************************************/
 265
 266 void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p)
 267 {
 268         ucontext_t     *_uc;
 269         mcontext_t     *_mc;
 270         u1             *pv;
 271         u1             *sp;
 272         u1             *ra;
 273         u1             *xpc;
 274         int             type;
 275         intptr_t        val;
 276         void           *p;
 277
 278         _uc = (ucontext_t *) _p;
 279         _mc = &_uc->uc_mcontext;
 280
 281         /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
 282            different to the ones in <ucontext.h>. */
 283
 284         pv  = NULL;
 285         sp  = (u1 *) _mc->gregs[REG_RSP];
 286         xpc = (u1 *) _mc->gregs[REG_RIP];
 287         ra  = xpc;                          /* return address is equal to xpc     */
 288
 289         /* This is a patcher. */
 290
 291         type = EXCEPTION_HARDWARE_PATCHER;
 292         val  = 0;
 293
 294         /* Handle the type. */
 295
 296         p = signal_handle(type, val, pv, sp, ra, xpc, _p);
 297
 298         /* set registers */
 299
 300         if (p != NULL) {
 301                 _mc->gregs[REG_RAX] = (intptr_t) p;
 302                 _mc->gregs[REG_R10] = (intptr_t) xpc;                /* REG_ITMP2_XPC */
 303                 _mc->gregs[REG_RIP] = (intptr_t) asm_handle_exception;
 304         }
 305 }
 306
 307
 308 /* md_signal_handler_sigusr1 ***************************************************
 309
 310    Signal handler for suspending threads.
 311
 312 *******************************************************************************/
 313
 314 #if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
 315 void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
 316 {
 317         ucontext_t *_uc;
 318         mcontext_t *_mc;
 319         u1         *pc;
 320         u1         *sp;
 321
 322         _uc = (ucontext_t *) _p;
 323         _mc = &_uc->uc_mcontext;
 324
 325         /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
 326            different to the ones in <ucontext.h>. */
 327
 328         /* get the PC and SP for this thread */
 329         pc = (u1 *) _mc->gregs[REG_RIP];
 330         sp = (u1 *) _mc->gregs[REG_RSP];
 331
 332         /* now suspend the current thread */
 333         threads_suspend_ack(pc, sp);
 334 }
 335 #endif
 336
 337
 338 /* md_signal_handler_sigusr2 ***************************************************
 339
 340    Signal handler for profiling sampling.
 341
 342 *******************************************************************************/
 343
 344 #if defined(ENABLE_THREADS)
 345 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
 346 {
 347         threadobject *t;
 348         ucontext_t   *_uc;
 349         mcontext_t   *_mc;
 350         u1           *pc;
 351
 352         t = THREADOBJECT;
 353
 354         _uc = (ucontext_t *) _p;
 355         _mc = &_uc->uc_mcontext;
 356
 357         /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
 358            different to the ones in <ucontext.h>. */
 359
 360         pc = (u1 *) _mc->gregs[REG_RIP];
 361
 362         t->pc = pc;
 363 }
 364 #endif
 365
 366
 367 /* md_replace_executionstate_read **********************************************
 368
 369    Read the given context into an executionstate for Replacement.
 370
 371 *******************************************************************************/
 372
 373 #if defined(ENABLE_REPLACEMENT)
 374 void md_replace_executionstate_read(executionstate_t *es, void *context)
 375 {
 376         ucontext_t *_uc;
 377         mcontext_t *_mc;
 378         s4          i;
 379         s4          d;
 380
 381         _uc = (ucontext_t *) context;
 382         _mc = &_uc->uc_mcontext;
 383
 384         /* read special registers */
 385         es->pc = (u1 *) _mc->gregs[REG_RSP];
 386         es->sp = (u1 *) _mc->gregs[REG_RSP];
 387         es->pv = NULL;
 388
 389         /* read integer registers */
 390         for (i = 0; i < INT_REG_CNT; i++) {
 391                 /* XXX FIX ME! */
 392
 393                 switch (i) {
 394                 case 0:  /* REG_RAX == 13 */
 395                         d = REG_RAX;
 396                         break;
 397                 case 1:  /* REG_RCX == 14 */
 398                         d = REG_RCX;
 399                         break;
 400                 case 2:  /* REG_RDX == 12 */
 401                         d = REG_RDX;
 402                         break;
 403                 case 3:  /* REG_RBX == 11 */
 404                         d = REG_RBX;
 405                         break;
 406                 case 4:  /* REG_RSP == 15 */
 407                         d = REG_RSP;
 408                         break;
 409                 case 5:  /* REG_RBP == 10 */
 410                         d = REG_RBP;
 411                         break;
 412                 case 6:  /* REG_RSI == 9  */
 413                         d = REG_RSI;
 414                         break;
 415                 case 7:  /* REG_RDI == 8  */
 416                         d = REG_RDI;
 417                         break;
 418                 case 8:  /* REG_R8  == 0  */
 419                 case 9:  /* REG_R9  == 1  */
 420                 case 10: /* REG_R10 == 2  */
 421                 case 11: /* REG_R11 == 3  */
 422                 case 12: /* REG_R12 == 4  */
 423                 case 13: /* REG_R13 == 5  */
 424                 case 14: /* REG_R14 == 6  */
 425                 case 15: /* REG_R15 == 7  */
 426                         d = i - 8;
 427                         break;
 428                 }
 429
 430                 es->intregs[i] = _mc->gregs[d];
 431         }
 432
 433         /* read float registers */
 434         for (i = 0; i < FLT_REG_CNT; i++)
 435                 es->fltregs[i] = 0xdeadbeefdeadbeefL;
 436 }
 437 #endif
 438
 439
 440 /* md_replace_executionstate_write *********************************************
 441
 442    Write the given executionstate back to the context for Replacement.
 443
 444 *******************************************************************************/
 445
 446 #if defined(ENABLE_REPLACEMENT)
 447 void md_replace_executionstate_write(executionstate_t *es, void *context)
 448 {
 449         ucontext_t *_uc;
 450         mcontext_t *_mc;
 451         s4          i;
 452         s4          d;
 453
 454         _uc = (ucontext_t *) context;
 455         _mc = &_uc->uc_mcontext;
 456
 457         /* write integer registers */
 458         for (i = 0; i < INT_REG_CNT; i++) {
 459                 /* XXX FIX ME! */
 460
 461                 switch (i) {
 462                 case 0:  /* REG_RAX == 13 */
 463                         d = REG_RAX;
 464                         break;
 465                 case 1:  /* REG_RCX == 14 */
 466                         d = REG_RCX;
 467                         break;
 468                 case 2:  /* REG_RDX == 12 */
 469                         d = REG_RDX;
 470                         break;
 471                 case 3:  /* REG_RBX == 11 */
 472                         d = REG_RBX;
 473                         break;
 474                 case 4:  /* REG_RSP == 15 */
 475                         d = REG_RSP;
 476                         break;
 477                 case 5:  /* REG_RBP == 10 */
 478                         d = REG_RBP;
 479                         break;
 480                 case 6:  /* REG_RSI == 9  */
 481                         d = REG_RSI;
 482                         break;
 483                 case 7:  /* REG_RDI == 8  */
 484                         d = REG_RDI;
 485                         break;
 486                 case 8:  /* REG_R8  == 0  */
 487                 case 9:  /* REG_R9  == 1  */
 488                 case 10: /* REG_R10 == 2  */
 489                 case 11: /* REG_R11 == 3  */
 490                 case 12: /* REG_R12 == 4  */
 491                 case 13: /* REG_R13 == 5  */
 492                 case 14: /* REG_R14 == 6  */
 493                 case 15: /* REG_R15 == 7  */
 494                         d = i - 8;
 495                         break;
 496                 }
 497
 498                 _mc->gregs[d] = es->intregs[i];
 499         }
 500
 501         /* write special registers */
 502         _mc->gregs[REG_RIP] = (ptrint) es->pc;
 503         _mc->gregs[REG_RSP] = (ptrint) es->sp;
 504 }
 505 #endif
 506
 507
 508 /* md_critical_section_restart *************************************************
 509
 510    Search the critical sections tree for a matching section and set
 511    the PC to the restart point, if necessary.
 512
 513 *******************************************************************************/
 514
 515 #if defined(ENABLE_THREADS)
 516 void md_critical_section_restart(ucontext_t *_uc)
 517 {
 518         mcontext_t *_mc;
 519         u1         *pc;
 520         u1         *npc;
 521
 522         _mc = &_uc->uc_mcontext;
 523
 524         /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
 525            different to the ones in <ucontext.h>. */
 526
 527         pc = (u1 *) _mc->gregs[REG_RIP];
 528
 529         npc = critical_find_restart_point(pc);
 530
 531         if (npc != NULL)
 532                 _mc->gregs[REG_RIP] = (ptrint) npc;
 533 }
 534 #endif
 535
 536
 537 /*
 538  * These are local overrides for various environment variables in Emacs.
 539  * Please do not remove this and leave it at the end of the file, where
 540  * Emacs will automagically detect them.
 541  * ---------------------------------------------------------------------
 542  * Local variables:
 543  * mode: c
 544  * indent-tabs-mode: t
 545  * c-basic-offset: 4
 546  * tab-width: 4
 547  * End:
 548  * vim:noexpandtab:sw=4:ts=4:
 549  */