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