src/vm/jit/i386/solaris/md-os.c

   1 /* src/vm/jit/i386/solaris/md-os.c - machine dependent i386 Solaris functions
   2
   3    Copyright (C) 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 <stdint.h>
  29 #include <ucontext.h>
  30
  31 #include "vm/types.h"
  32
  33 #include "vm/jit/i386/codegen.h"
  34 #include "vm/jit/i386/md.h"
  35
  36 #include "threads/thread.h"
  37
  38 #include "vm/builtin.h"
  39 #include "vm/signallocal.h"
  40 #include "vm/stringlocal.h"
  41
  42 #include "vm/jit/asmpart.h"
  43 #include "vm/jit/executionstate.h"
  44 #include "vm/jit/stacktrace.hpp"
  45 #include "vm/jit/trap.h"
  46
  47
  48 /* md_signal_handler_sigsegv ***************************************************
  49
  50    Signal handler for hardware exceptions.
  51
  52 *******************************************************************************/
  53
  54 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
  55 {
  56         ucontext_t     *_uc;
  57         mcontext_t     *_mc;
  58         u1             *pv;
  59         u1             *sp;
  60         u1             *ra;
  61         u1             *xpc;
  62         u1              opc;
  63         u1              mod;
  64         u1              rm;
  65         s4              d;
  66         s4              disp;
  67         ptrint          val;
  68         s4              type;
  69         void           *p;
  70         java_object_t  *o;
  71
  72         _uc = (ucontext_t *) _p;
  73         _mc = &_uc->uc_mcontext;
  74
  75         pv  = NULL;                 /* is resolved during stackframeinfo creation */
  76         sp  = (u1 *) _mc->gregs[ESP];
  77         xpc = (u1 *) _mc->gregs[EIP];
  78         ra  = xpc;                              /* return address is equal to XPC */
  79
  80         /* get exception-throwing instruction */
  81
  82         opc = M_ALD_MEM_GET_OPC(xpc);
  83         mod = M_ALD_MEM_GET_MOD(xpc);
  84         rm  = M_ALD_MEM_GET_RM(xpc);
  85
  86         /* for values see emit_mov_mem_reg and emit_mem */
  87
  88         if ((opc == 0x8b) && (mod == 0) && (rm == 5)) {
  89                 /* this was a hardware-exception */
  90
  91                 d    = M_ALD_MEM_GET_REG(xpc);
  92                 disp = M_ALD_MEM_GET_DISP(xpc);
  93
  94                 /* we use the exception type as load displacement */
  95
  96                 type = disp;
  97
  98                 /* ATTENTION: The _mc->gregs layout is completely crazy!  The
  99                    registers are reversed starting with number 4 for REG_EDI
 100                    (see /usr/include/sys/ucontext.h).  We have to convert that
 101                    here. */
 102
 103                 val = _mc->gregs[EAX - d];
 104
 105                 if (type == TRAP_COMPILER) {
 106                         /* The PV from the compiler stub is equal to the XPC. */
 107
 108                         pv = xpc;
 109
 110                         /* We use a framesize of zero here because the call pushed
 111                            the return addres onto the stack. */
 112
 113                         ra = md_stacktrace_get_returnaddress(sp, 0);
 114
 115                         /* Skip the RA on the stack. */
 116
 117                         sp = sp + 1 * SIZEOF_VOID_P;
 118
 119                         /* The XPC is the RA minus 2, because the RA points to the
 120                            instruction after the call. */
 121
 122                         xpc = ra - 2;
 123                 }
 124         }
 125         else {
 126                 /* this was a normal NPE */
 127
 128                 type = TRAP_NullPointerException;
 129                 val  = 0;
 130         }
 131
 132         /* Handle the trap. */
 133
 134         p = trap_handle(type, val, pv, sp, ra, xpc, _p);
 135
 136         /* Set registers. */
 137
 138         if (type == TRAP_COMPILER) {
 139                 if (p == NULL) {
 140                         o = builtin_retrieve_exception();
 141
 142                         _mc->gregs[ESP] = (uintptr_t) sp;    /* Remove RA from stack. */
 143
 144                         _mc->gregs[EAX] = (uintptr_t) o;
 145                         _mc->gregs[ECX] = (uintptr_t) xpc;           /* REG_ITMP2_XPC */
 146                         _mc->gregs[EIP] = (uintptr_t) asm_handle_exception;
 147                 }
 148                 else {
 149                         _mc->gregs[EIP] = (uintptr_t) p;
 150                 }
 151         }
 152         else {
 153                 _mc->gregs[EAX] = (uintptr_t) p;
 154                 _mc->gregs[ECX] = (uintptr_t) xpc;               /* REG_ITMP2_XPC */
 155                 _mc->gregs[EIP] = (uintptr_t) asm_handle_exception;
 156         }
 157 }
 158
 159
 160 /* md_signal_handler_sigfpe ****************************************************
 161
 162    ArithmeticException signal handler for hardware divide by zero
 163    check.
 164
 165 *******************************************************************************/
 166
 167 void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
 168 {
 169         ucontext_t *_uc;
 170         mcontext_t *_mc;
 171         u1         *pv;
 172         u1         *sp;
 173         u1         *ra;
 174         u1         *xpc;
 175         s4          type;
 176         ptrint      val;
 177         void       *p;
 178
 179         _uc = (ucontext_t *) _p;
 180         _mc = &_uc->uc_mcontext;
 181
 182         pv  = NULL;                 /* is resolved during stackframeinfo creation */
 183         sp  = (u1 *) _mc->gregs[ESP];
 184         xpc = (u1 *) _mc->gregs[EIP];
 185         ra  = xpc;                          /* return address is equal to xpc     */
 186
 187         /* This is an ArithmeticException. */
 188
 189         type = TRAP_ArithmeticException;
 190         val  = 0;
 191
 192         /* Handle the trap. */
 193
 194         p = trap_handle(type, val, pv, sp, ra, xpc, _p);
 195
 196         /* Set registers. */
 197
 198         _mc->gregs[EAX] = (uintptr_t) p;
 199         _mc->gregs[ECX] = (uintptr_t) xpc;                   /* REG_ITMP2_XPC */
 200         _mc->gregs[EIP] = (uintptr_t) asm_handle_exception;
 201 }
 202
 203
 204 /* md_signal_handler_sigill ****************************************************
 205
 206    Signal handler for hardware patcher traps (ud2).
 207
 208 *******************************************************************************/
 209
 210 void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p)
 211 {
 212         ucontext_t *_uc;
 213         mcontext_t *_mc;
 214         u1         *pv;
 215         u1         *sp;
 216         u1         *ra;
 217         u1         *xpc;
 218         s4          type;
 219         ptrint      val;
 220         void       *p;
 221
 222         _uc = (ucontext_t *) _p;
 223         _mc = &_uc->uc_mcontext;
 224
 225         pv  = NULL;                 /* is resolved during stackframeinfo creation */
 226         sp  = (u1 *) _mc->gregs[ESP];
 227         xpc = (u1 *) _mc->gregs[EIP];
 228         ra  = xpc;                            /* return address is equal to xpc   */
 229
 230         type = TRAP_PATCHER;
 231         val  = 0;
 232
 233         /* Handle the trap. */
 234
 235         p = trap_handle(type, val, pv, sp, ra, xpc, _p);
 236
 237         /* Set registers. */
 238
 239         if (p != NULL) {
 240                 _mc->gregs[EAX] = (uintptr_t) p;
 241                 _mc->gregs[ECX] = (uintptr_t) xpc;               /* REG_ITMP2_XPC */
 242                 _mc->gregs[EIP] = (uintptr_t) asm_handle_exception;
 243         }
 244 }
 245
 246
 247 /* md_signal_handler_sigusr1 ***************************************************
 248
 249    Signal handler for suspending threads.
 250
 251 *******************************************************************************/
 252
 253 #if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
 254 void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
 255 {
 256         ucontext_t *_uc;
 257         mcontext_t *_mc;
 258         u1         *pc;
 259         u1         *sp;
 260
 261         _uc = (ucontext_t *) _p;
 262         _mc = &_uc->uc_mcontext;
 263
 264         /* get the PC and SP for this thread */
 265         pc = (u1 *) _mc->gregs[EIP];
 266         sp = (u1 *) _mc->gregs[ESP];
 267
 268         /* now suspend the current thread */
 269         threads_suspend_ack(pc, sp);
 270 }
 271 #endif
 272
 273
 274 /* md_signal_handler_sigusr2 ***************************************************
 275
 276    Signal handler for profiling sampling.
 277
 278 *******************************************************************************/
 279
 280 #if defined(ENABLE_THREADS)
 281 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
 282 {
 283         threadobject *t;
 284         ucontext_t   *_uc;
 285         mcontext_t   *_mc;
 286         u1           *pc;
 287
 288         t = THREADOBJECT;
 289
 290         _uc = (ucontext_t *) _p;
 291         _mc = &_uc->uc_mcontext;
 292
 293         pc = (u1 *) _mc->gregs[EIP];
 294
 295         t->pc = pc;
 296 }
 297 #endif
 298
 299
 300 /* md_executionstate_read ******************************************************
 301
 302    Read the given context into an executionstate for Replacement.
 303
 304 *******************************************************************************/
 305
 306 void md_executionstate_read(executionstate_t *es, void *context)
 307 {
 308         ucontext_t *_uc;
 309         mcontext_t *_mc;
 310         s4          i;
 311
 312         _uc = (ucontext_t *) context;
 313         _mc = &_uc->uc_mcontext;
 314
 315         /* read special registers */
 316         es->pc = (u1 *) _mc->gregs[EIP];
 317         es->sp = (u1 *) _mc->gregs[ESP];
 318         es->pv = NULL;                   /* pv must be looked up via AVL tree */
 319
 320         /* read integer registers */
 321         for (i = 0; i < INT_REG_CNT; i++)
 322                 es->intregs[i] = _mc->gregs[EAX - i];
 323
 324         /* read float registers */
 325         for (i = 0; i < FLT_REG_CNT; i++)
 326                 es->fltregs[i] = 0xdeadbeefdeadbeefULL;
 327 }
 328
 329
 330 /* md_executionstate_write *****************************************************
 331
 332    Write the given executionstate back to the context for Replacement.
 333
 334 *******************************************************************************/
 335
 336 void md_executionstate_write(executionstate_t *es, void *context)
 337 {
 338         ucontext_t *_uc;
 339         mcontext_t *_mc;
 340         s4          i;
 341
 342         _uc = (ucontext_t *) context;
 343         _mc = &_uc->uc_mcontext;
 344
 345         /* write integer registers */
 346         for (i = 0; i < INT_REG_CNT; i++)
 347                 _mc->gregs[EAX - i] = es->intregs[i];
 348
 349         /* write special registers */
 350         _mc->gregs[EIP] = (ptrint) es->pc;
 351         _mc->gregs[ESP] = (ptrint) es->sp;
 352 }
 353
 354
 355 /*
 356  * These are local overrides for various environment variables in Emacs.
 357  * Please do not remove this and leave it at the end of the file, where
 358  * Emacs will automagically detect them.
 359  * ---------------------------------------------------------------------
 360  * Local variables:
 361  * mode: c
 362  * indent-tabs-mode: t
 363  * c-basic-offset: 4
 364  * tab-width: 4
 365  * End:
 366  */