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, 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 #define _GNU_SOURCE
  27
  28 #include "config.h"
  29
  30 #include <assert.h>
  31 #include <stdint.h>
  32 #include <stdlib.h>
  33 #include <ucontext.h>
  34
  35 #include "vm/types.h"
  36
  37 #include "vm/jit/x86_64/codegen.h"
  38 #include "vm/jit/x86_64/md.h"
  39
  40 #include "threads/thread.hpp"
  41
  42 #include "vm/jit/builtin.hpp"
  43 #include "vm/signallocal.h"
  44
  45 #include "vm/jit/asmpart.h"
  46 #include "vm/jit/executionstate.h"
  47 #include "vm/jit/trap.h"
  48 #include "vm/jit/stacktrace.hpp"
  49
  50
  51 /* md_signal_handler_sigsegv ***************************************************
  52
  53    Signal handler for hardware exception.
  54
  55 *******************************************************************************/
  56
  57 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
  58 {
  59         ucontext_t     *_uc;
  60         mcontext_t     *_mc;
  61         void           *pv;
  62         u1             *sp;
  63         u1             *ra;
  64         u1             *xpc;
  65         u1              opc;
  66         u1              mod;
  67         u1              rm;
  68         s4              d;
  69         s4              disp;
  70         int             type;
  71         intptr_t        val;
  72         void           *p;
  73
  74         _uc = (ucontext_t *) _p;
  75         _mc = &_uc->uc_mcontext;
  76
  77         /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
  78            different to the ones in <ucontext.h>. */
  79
  80         pv  = NULL;                 /* is resolved during stackframeinfo creation */
  81         sp  = (u1 *) _mc->gregs[REG_RSP];
  82         xpc = (u1 *) _mc->gregs[REG_RIP];
  83         ra  = xpc;                              /* return address is equal to XPC */
  84
  85 #if 0
  86         /* check for StackOverflowException */
  87
  88         threads_check_stackoverflow(sp);
  89 #endif
  90
  91         /* get exception-throwing instruction */
  92
  93         opc = M_ALD_MEM_GET_OPC(xpc);
  94         mod = M_ALD_MEM_GET_MOD(xpc);
  95         rm  = M_ALD_MEM_GET_RM(xpc);
  96
  97         /* for values see emit_mov_mem_reg and emit_mem */
  98
  99         if ((opc == 0x8b) && (mod == 0) && (rm == 4)) {
 100                 /* this was a hardware-exception */
 101
 102                 d    = M_ALD_MEM_GET_REG(xpc);
 103                 disp = M_ALD_MEM_GET_DISP(xpc);
 104
 105                 /* we use the exception type as load displacement */
 106
 107                 type = disp;
 108
 109                 /* XXX FIX ME! */
 110
 111                 /* ATTENTION: The _mc->gregs layout is even worse than on
 112                    i386! See /usr/include/sys/ucontext.h.  We need a
 113                    switch-case here... */
 114
 115                 switch (d) {
 116                 case 0:  /* REG_RAX == 13 */
 117                         d = REG_RAX;
 118                         break;
 119                 case 1:  /* REG_RCX == 14 */
 120                         d = REG_RCX;
 121                         break;
 122                 case 2:  /* REG_RDX == 12 */
 123                         d = REG_RDX;
 124                         break;
 125                 case 3:  /* REG_RBX == 11 */
 126                         d = REG_RBX;
 127                         break;
 128                 case 4:  /* REG_RSP == 15 */
 129                         d = REG_RSP;
 130                         break;
 131                 case 5:  /* REG_RBP == 10 */
 132                         d = REG_RBP;
 133                         break;
 134                 case 6:  /* REG_RSI == 9  */
 135                         d = REG_RSI;
 136                         break;
 137                 case 7:  /* REG_RDI == 8  */
 138                         d = REG_RDI;
 139                         break;
 140                 case 8:  /* REG_R8  == 0  */
 141                 case 9:  /* REG_R9  == 1  */
 142                 case 10: /* REG_R10 == 2  */
 143                 case 11: /* REG_R11 == 3  */
 144                 case 12: /* REG_R12 == 4  */
 145                 case 13: /* REG_R13 == 5  */
 146                 case 14: /* REG_R14 == 6  */
 147                 case 15: /* REG_R15 == 7  */
 148                         d = d - 8;
 149                         break;
 150                 }
 151
 152                 val = _mc->gregs[d];
 153
 154                 if (type == TRAP_COMPILER) {
 155                         /* The PV from the compiler stub is equal to the XPC. */
 156
 157                         pv = xpc;
 158
 159                         /* We use a framesize of zero here because the call pushed
 160                            the return addres onto the stack. */
 161
 162                         ra = md_stacktrace_get_returnaddress(sp, 0);
 163
 164                         /* Skip the RA on the stack. */
 165
 166                         sp = sp + 1 * SIZEOF_VOID_P;
 167
 168                         /* The XPC is the RA minus 1, because the RA points to the
 169                            instruction after the call. */
 170
 171                         xpc = ra - 3;
 172                 }
 173         }
 174         else {
 175                 /* this was a normal NPE */
 176
 177                 type = TRAP_NullPointerException;
 178                 val  = 0;
 179         }
 180
 181         /* Handle the trap. */
 182
 183         p = trap_handle(type, val, pv, sp, ra, xpc, _p);
 184
 185         /* Set registers. */
 186
 187         if (type == TRAP_COMPILER) {
 188                 if (p == NULL) {
 189                         _mc->gregs[REG_RSP] = (uintptr_t) sp;    /* Remove RA from stack. */
 190                 }
 191         }
 192 }
 193
 194
 195 /* md_signal_handler_sigfpe ****************************************************
 196
 197    ArithmeticException signal handler for hardware divide by zero
 198    check.
 199
 200 *******************************************************************************/
 201
 202 void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
 203 {
 204         ucontext_t     *_uc;
 205         mcontext_t     *_mc;
 206         u1             *pv;
 207         u1             *sp;
 208         u1             *ra;
 209         u1             *xpc;
 210         int             type;
 211         intptr_t        val;
 212
 213         _uc = (ucontext_t *) _p;
 214         _mc = &_uc->uc_mcontext;
 215
 216         /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
 217            different to the ones in <ucontext.h>. */
 218
 219         pv  = NULL;
 220         sp  = (u1 *) _mc->gregs[REG_RSP];
 221         xpc = (u1 *) _mc->gregs[REG_RIP];
 222         ra  = xpc;                          /* return address is equal to xpc     */
 223
 224         /* This is an ArithmeticException. */
 225
 226         type = TRAP_ArithmeticException;
 227         val  = 0;
 228
 229         /* Handle the trap. */
 230
 231         trap_handle(type, val, pv, sp, ra, xpc, _p);
 232 }
 233
 234
 235 /* md_signal_handler_sigill ****************************************************
 236
 237    Signal handler for patchers.
 238
 239 *******************************************************************************/
 240
 241 void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p)
 242 {
 243         ucontext_t     *_uc;
 244         mcontext_t     *_mc;
 245         u1             *pv;
 246         u1             *sp;
 247         u1             *ra;
 248         u1             *xpc;
 249         int             type;
 250         intptr_t        val;
 251
 252         _uc = (ucontext_t *) _p;
 253         _mc = &_uc->uc_mcontext;
 254
 255         /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
 256            different to the ones in <ucontext.h>. */
 257
 258         pv  = NULL;
 259         sp  = (u1 *) _mc->gregs[REG_RSP];
 260         xpc = (u1 *) _mc->gregs[REG_RIP];
 261         ra  = xpc;                          /* return address is equal to xpc     */
 262
 263         /* This is a patcher. */
 264
 265         type = TRAP_PATCHER;
 266         val  = 0;
 267
 268         /* Handle the trap. */
 269
 270         trap_handle(type, val, pv, sp, ra, xpc, _p);
 271 }
 272
 273
 274 /* md_signal_handler_sigusr1 ***************************************************
 275
 276    Signal handler for suspending threads.
 277
 278 *******************************************************************************/
 279
 280 #if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
 281 void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
 282 {
 283         ucontext_t *_uc;
 284         mcontext_t *_mc;
 285         u1         *pc;
 286         u1         *sp;
 287
 288         _uc = (ucontext_t *) _p;
 289         _mc = &_uc->uc_mcontext;
 290
 291         /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
 292            different to the ones in <ucontext.h>. */
 293
 294         /* get the PC and SP for this thread */
 295         pc = (u1 *) _mc->gregs[REG_RIP];
 296         sp = (u1 *) _mc->gregs[REG_RSP];
 297
 298         /* now suspend the current thread */
 299         threads_suspend_ack(pc, sp);
 300 }
 301 #endif
 302
 303
 304 /* md_signal_handler_sigusr2 ***************************************************
 305
 306    Signal handler for profiling sampling.
 307
 308 *******************************************************************************/
 309
 310 #if defined(ENABLE_THREADS)
 311 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
 312 {
 313         threadobject *t;
 314         ucontext_t   *_uc;
 315         mcontext_t   *_mc;
 316         u1           *pc;
 317
 318         t = THREADOBJECT;
 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         pc = (u1 *) _mc->gregs[REG_RIP];
 327
 328         t->pc = pc;
 329 }
 330 #endif
 331
 332
 333 /* md_executionstate_read ******************************************************
 334
 335    Read the given context into an executionstate.
 336
 337 *******************************************************************************/
 338
 339 void md_executionstate_read(executionstate_t *es, void *context)
 340 {
 341         ucontext_t *_uc;
 342         mcontext_t *_mc;
 343         s4          i;
 344         s4          d;
 345
 346         _uc = (ucontext_t *) context;
 347         _mc = &_uc->uc_mcontext;
 348
 349         /* read special registers */
 350         es->pc = (u1 *) _mc->gregs[REG_RIP];
 351         es->sp = (u1 *) _mc->gregs[REG_RSP];
 352         es->pv = NULL;
 353
 354         /* read integer registers */
 355         for (i = 0; i < INT_REG_CNT; i++) {
 356                 /* XXX FIX ME! */
 357
 358                 switch (i) {
 359                 case 0:  /* REG_RAX == 13 */
 360                         d = REG_RAX;
 361                         break;
 362                 case 1:  /* REG_RCX == 14 */
 363                         d = REG_RCX;
 364                         break;
 365                 case 2:  /* REG_RDX == 12 */
 366                         d = REG_RDX;
 367                         break;
 368                 case 3:  /* REG_RBX == 11 */
 369                         d = REG_RBX;
 370                         break;
 371                 case 4:  /* REG_RSP == 15 */
 372                         d = REG_RSP;
 373                         break;
 374                 case 5:  /* REG_RBP == 10 */
 375                         d = REG_RBP;
 376                         break;
 377                 case 6:  /* REG_RSI == 9  */
 378                         d = REG_RSI;
 379                         break;
 380                 case 7:  /* REG_RDI == 8  */
 381                         d = REG_RDI;
 382                         break;
 383                 case 8:  /* REG_R8  == 0  */
 384                 case 9:  /* REG_R9  == 1  */
 385                 case 10: /* REG_R10 == 2  */
 386                 case 11: /* REG_R11 == 3  */
 387                 case 12: /* REG_R12 == 4  */
 388                 case 13: /* REG_R13 == 5  */
 389                 case 14: /* REG_R14 == 6  */
 390                 case 15: /* REG_R15 == 7  */
 391                         d = i - 8;
 392                         break;
 393                 }
 394
 395                 es->intregs[i] = _mc->gregs[d];
 396         }
 397
 398         /* read float registers */
 399         for (i = 0; i < FLT_REG_CNT; i++)
 400                 es->fltregs[i] = 0xdeadbeefdeadbeefL;
 401 }
 402
 403
 404 /* md_executionstate_write *****************************************************
 405
 406    Write the given executionstate back to the context.
 407
 408 *******************************************************************************/
 409
 410 void md_executionstate_write(executionstate_t *es, void *context)
 411 {
 412         ucontext_t *_uc;
 413         mcontext_t *_mc;
 414         s4          i;
 415         s4          d;
 416
 417         _uc = (ucontext_t *) context;
 418         _mc = &_uc->uc_mcontext;
 419
 420         /* write integer registers */
 421         for (i = 0; i < INT_REG_CNT; i++) {
 422                 /* XXX FIX ME! */
 423
 424                 switch (i) {
 425                 case 0:  /* REG_RAX == 13 */
 426                         d = REG_RAX;
 427                         break;
 428                 case 1:  /* REG_RCX == 14 */
 429                         d = REG_RCX;
 430                         break;
 431                 case 2:  /* REG_RDX == 12 */
 432                         d = REG_RDX;
 433                         break;
 434                 case 3:  /* REG_RBX == 11 */
 435                         d = REG_RBX;
 436                         break;
 437                 case 4:  /* REG_RSP == 15 */
 438                         d = REG_RSP;
 439                         break;
 440                 case 5:  /* REG_RBP == 10 */
 441                         d = REG_RBP;
 442                         break;
 443                 case 6:  /* REG_RSI == 9  */
 444                         d = REG_RSI;
 445                         break;
 446                 case 7:  /* REG_RDI == 8  */
 447                         d = REG_RDI;
 448                         break;
 449                 case 8:  /* REG_R8  == 0  */
 450                 case 9:  /* REG_R9  == 1  */
 451                 case 10: /* REG_R10 == 2  */
 452                 case 11: /* REG_R11 == 3  */
 453                 case 12: /* REG_R12 == 4  */
 454                 case 13: /* REG_R13 == 5  */
 455                 case 14: /* REG_R14 == 6  */
 456                 case 15: /* REG_R15 == 7  */
 457                         d = i - 8;
 458                         break;
 459                 }
 460
 461                 _mc->gregs[d] = es->intregs[i];
 462         }
 463
 464         /* write special registers */
 465         _mc->gregs[REG_RIP] = (ptrint) es->pc;
 466         _mc->gregs[REG_RSP] = (ptrint) es->sp;
 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  */