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