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

   1 /* src/vm/jit/powerpc/linux/md-os.c - machine dependent PowerPC Linux functions
   2
   3    Copyright (C) 1996-2005, 2006, 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 #include "config.h"
  27
  28 #include <assert.h>
  29 #include <stdint.h>
  30 #include <ucontext.h>
  31
  32 #include "vm/types.h"
  33
  34 #include "vm/jit/powerpc/codegen.h"
  35 #include "vm/jit/powerpc/md.h"
  36 #include "vm/jit/powerpc/linux/md-abi.h"
  37
  38 #if defined(ENABLE_THREADS)
  39 # include "threads/native/threads.h"
  40 #endif
  41
  42 #include "vm/builtin.h"
  43 #include "vm/exceptions.h"
  44 #include "vm/signallocal.h"
  45 #include "vm/stringlocal.h"
  46
  47 #include "vm/jit/asmpart.h"
  48 #include "vm/jit/executionstate.h"
  49
  50 #if defined(ENABLE_PROFILING)
  51 # include "vm/jit/optimizing/profile.h"
  52 #endif
  53
  54 #include "vm/jit/stacktrace.h"
  55
  56 #include "vmcore/system.h"
  57
  58
  59 /* md_signal_handler_sigsegv ***************************************************
  60
  61    Signal handler for hardware-exceptions.
  62
  63 *******************************************************************************/
  64
  65 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
  66 {
  67         ucontext_t     *_uc;
  68         mcontext_t     *_mc;
  69         unsigned long  *_gregs;
  70         u1             *pv;
  71         u1             *sp;
  72         u1             *ra;
  73         u1             *xpc;
  74         u4              mcode;
  75         int             s1;
  76         int16_t         disp;
  77         int             d;
  78         intptr_t        addr;
  79         intptr_t        val;
  80         int             type;
  81         void           *p;
  82
  83         _uc = (ucontext_t *) _p;
  84
  85 #if defined(__UCLIBC__)
  86         _mc    = &(_uc->uc_mcontext);
  87         _gregs = _mc->regs->gpr;
  88 #else
  89         _mc    = _uc->uc_mcontext.uc_regs;
  90         _gregs = _mc->gregs;
  91 #endif
  92
  93         pv  = (u1 *) _gregs[REG_PV];
  94         sp  = (u1 *) _gregs[REG_SP];
  95         ra  = (u1 *) _gregs[PT_LNK];                 /* this is correct for leafs */
  96         xpc = (u1 *) _gregs[PT_NIP];
  97
  98         /* get exception-throwing instruction */
  99
 100         mcode = *((u4 *) xpc);
 101
 102         s1   = M_INSTR_OP2_IMM_A(mcode);
 103         disp = M_INSTR_OP2_IMM_I(mcode);
 104         d    = M_INSTR_OP2_IMM_D(mcode);
 105
 106         val  = _gregs[d];
 107
 108         /* check for special-load */
 109
 110         if (s1 == REG_ZERO) {
 111                 /* we use the exception type as load displacement */
 112
 113                 type = disp;
 114
 115                 if (type == EXCEPTION_HARDWARE_COMPILER) {
 116                         /* The XPC is the RA minus 4, because the RA points to the
 117                            instruction after the call. */
 118
 119                         xpc = ra - 4;
 120                 }
 121         }
 122         else {
 123                 /* This is a normal NPE: addr must be NULL and the NPE-type
 124                    define is 0. */
 125
 126                 addr = _gregs[s1];
 127                 type = EXCEPTION_HARDWARE_NULLPOINTER;
 128
 129                 if (addr != 0)
 130                         vm_abort("md_signal_handler_sigsegv: faulting address is not NULL: addr=%p", addr);
 131         }
 132
 133         /* Handle the type. */
 134
 135         p = signal_handle(type, val, pv, sp, ra, xpc, _p);
 136
 137         /* Set registers. */
 138
 139         switch (type) {
 140         case EXCEPTION_HARDWARE_COMPILER:
 141                 if (p != NULL) {
 142                         _gregs[REG_PV] = (uintptr_t) p;
 143                         _gregs[PT_NIP] = (uintptr_t) p;
 144                         break;
 145                 }
 146
 147                 /* Get and set the PV from the parent Java method. */
 148
 149                 pv = md_codegen_get_pv_from_pc(ra);
 150
 151                 _gregs[REG_PV] = (uintptr_t) pv;
 152
 153                 /* Get the exception object. */
 154
 155                 p = builtin_retrieve_exception();
 156
 157                 assert(p != NULL);
 158
 159                 /* fall-through */
 160
 161         case EXCEPTION_HARDWARE_PATCHER:
 162                 if (p == NULL)
 163                         break;
 164
 165                 /* fall-through */
 166
 167         default:
 168                 _gregs[REG_ITMP1_XPTR] = (uintptr_t) p;
 169                 _gregs[REG_ITMP2_XPC]  = (uintptr_t) xpc;
 170                 _gregs[PT_NIP]         = (uintptr_t) asm_handle_exception;
 171         }
 172 }
 173
 174
 175 /* md_signal_handler_sigtrap ***************************************************
 176
 177    Signal handler for hardware-traps.
 178
 179 *******************************************************************************/
 180
 181 void md_signal_handler_sigtrap(int sig, siginfo_t *siginfo, void *_p)
 182 {
 183         ucontext_t     *_uc;
 184         mcontext_t     *_mc;
 185         unsigned long  *_gregs;
 186         u1             *pv;
 187         u1             *sp;
 188         u1             *ra;
 189         u1             *xpc;
 190         u4              mcode;
 191         int             s1;
 192         intptr_t        val;
 193         int             type;
 194         void           *p;
 195
 196         _uc = (ucontext_t *) _p;
 197
 198 #if defined(__UCLIBC__)
 199         _mc    = &(_uc->uc_mcontext);
 200         _gregs = _mc->regs->gpr;
 201 #else
 202         _mc    = _uc->uc_mcontext.uc_regs;
 203         _gregs = _mc->gregs;
 204 #endif
 205
 206         pv  = (u1 *) _gregs[REG_PV];
 207         sp  = (u1 *) _gregs[REG_SP];
 208         ra  = (u1 *) _gregs[PT_LNK];                 /* this is correct for leafs */
 209         xpc = (u1 *) _gregs[PT_NIP];
 210
 211         /* get exception-throwing instruction */
 212
 213         mcode = *((u4 *) xpc);
 214
 215         s1 = M_OP3_GET_A(mcode);
 216
 217         /* for now we only handle ArrayIndexOutOfBoundsException */
 218
 219         type = EXCEPTION_HARDWARE_ARRAYINDEXOUTOFBOUNDS;
 220         val  = _gregs[s1];
 221
 222         /* Handle the type. */
 223
 224         p = signal_handle(type, val, pv, sp, ra, xpc, _p);
 225
 226         /* set registers */
 227
 228         _gregs[REG_ITMP1_XPTR] = (intptr_t) p;
 229         _gregs[REG_ITMP2_XPC]  = (intptr_t) xpc;
 230         _gregs[PT_NIP]         = (intptr_t) asm_handle_exception;
 231 }
 232
 233
 234 /* md_signal_handler_sigusr1 ***************************************************
 235
 236    Signal handler for suspending threads.
 237
 238 *******************************************************************************/
 239
 240 #if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
 241 void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
 242 {
 243         ucontext_t    *_uc;
 244         mcontext_t    *_mc;
 245         unsigned long *_gregs;
 246         u1            *pc;
 247         u1            *sp;
 248
 249         _uc = (ucontext_t *) _p;
 250
 251 #if defined(__UCLIBC__)
 252         _mc    = &(_uc->uc_mcontext);
 253         _gregs = _mc->regs->gpr;
 254 #else
 255         _mc    = _uc->uc_mcontext.uc_regs;
 256         _gregs = _mc->gregs;
 257 #endif
 258
 259         /* get the PC and SP for this thread */
 260
 261         pc = (u1 *) _gregs[PT_NIP];
 262         sp = (u1 *) _gregs[REG_SP];
 263
 264         /* now suspend the current thread */
 265
 266         threads_suspend_ack(pc, sp);
 267 }
 268 #endif
 269
 270
 271 /* md_signal_handler_sigusr2 ***************************************************
 272
 273    Signal handler for profiling sampling.
 274
 275 *******************************************************************************/
 276
 277 #if defined(ENABLE_THREADS)
 278 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
 279 {
 280         threadobject  *tobj;
 281         ucontext_t    *_uc;
 282         mcontext_t    *_mc;
 283         unsigned long *_gregs;
 284         u1            *pc;
 285
 286         tobj = THREADOBJECT;
 287
 288         _uc = (ucontext_t *) _p;
 289
 290 #if defined(__UCLIBC__)
 291         _mc    = &(_uc->uc_mcontext);
 292         _gregs = _mc->regs->gpr;
 293 #else
 294         _mc    = _uc->uc_mcontext.uc_regs;
 295         _gregs = _mc->gregs;
 296 #endif
 297
 298         pc = (u1 *) _gregs[PT_NIP];
 299
 300         tobj->pc = pc;
 301 }
 302 #endif
 303
 304
 305 /* md_executionstate_read ******************************************************
 306
 307    Read the given context into an executionstate.
 308
 309 *******************************************************************************/
 310
 311 void md_executionstate_read(executionstate_t *es, void *context)
 312 {
 313         ucontext_t    *_uc;
 314         mcontext_t    *_mc;
 315         unsigned long *_gregs;
 316         s4              i;
 317
 318         _uc = (ucontext_t *) context;
 319
 320 #if defined(__UCLIBC__)
 321 #error Please port md_executionstate_read to __UCLIBC__
 322 #else
 323         _mc    = _uc->uc_mcontext.uc_regs;
 324         _gregs = _mc->gregs;
 325 #endif
 326
 327         /* read special registers */
 328         es->pc = (u1 *) _gregs[PT_NIP];
 329         es->sp = (u1 *) _gregs[REG_SP];
 330         es->pv = (u1 *) _gregs[REG_PV];
 331         es->ra = (u1 *) _gregs[PT_LNK];
 332
 333         /* read integer registers */
 334         for (i = 0; i < INT_REG_CNT; i++)
 335                 es->intregs[i] = _gregs[i];
 336
 337         /* read float registers */
 338         /* Do not use the assignment operator '=', as the type of
 339          * the _mc->fpregs[i] can cause invalid conversions. */
 340
 341         assert(sizeof(_mc->fpregs.fpregs) == sizeof(es->fltregs));
 342         system_memcpy(&es->fltregs, &_mc->fpregs.fpregs, sizeof(_mc->fpregs.fpregs));
 343 }
 344
 345
 346 /* md_executionstate_write *****************************************************
 347
 348    Write the given executionstate back to the context.
 349
 350 *******************************************************************************/
 351
 352 void md_executionstate_write(executionstate_t *es, void *context)
 353 {
 354         ucontext_t    *_uc;
 355         mcontext_t    *_mc;
 356         unsigned long *_gregs;
 357         s4              i;
 358
 359         _uc = (ucontext_t *) context;
 360
 361 #if defined(__UCLIBC__)
 362 #error Please port md_executionstate_write to __UCLIBC__
 363 #else
 364         _mc    = _uc->uc_mcontext.uc_regs;
 365         _gregs = _mc->gregs;
 366 #endif
 367
 368         /* write integer registers */
 369         for (i = 0; i < INT_REG_CNT; i++)
 370                 _gregs[i] = es->intregs[i];
 371
 372         /* write float registers */
 373         /* Do not use the assignment operator '=', as the type of
 374          * the _mc->fpregs[i] can cause invalid conversions. */
 375
 376         assert(sizeof(_mc->fpregs.fpregs) == sizeof(es->fltregs));
 377         system_memcpy(&_mc->fpregs.fpregs, &es->fltregs, sizeof(_mc->fpregs.fpregs));
 378
 379         /* write special registers */
 380         _gregs[PT_NIP] = (ptrint) es->pc;
 381         _gregs[REG_SP] = (ptrint) es->sp;
 382         _gregs[REG_PV] = (ptrint) es->pv;
 383         _gregs[PT_LNK] = (ptrint) es->ra;
 384 }
 385
 386
 387 /* md_critical_section_restart *************************************************
 388
 389    Search the critical sections tree for a matching section and set
 390    the PC to the restart point, if necessary.
 391
 392 *******************************************************************************/
 393
 394 #if defined(ENABLE_THREADS)
 395 void md_critical_section_restart(ucontext_t *_uc)
 396 {
 397         mcontext_t    *_mc;
 398         unsigned long *_gregs;
 399         u1            *pc;
 400         u1            *npc;
 401
 402 #if defined(__UCLIBC__)
 403         _mc    = &(_uc->uc_mcontext);
 404         _gregs = _mc->regs->gpr;
 405 #else
 406         _mc    = _uc->uc_mcontext.uc_regs;
 407         _gregs = _mc->gregs;
 408 #endif
 409
 410         pc = (u1 *) _gregs[PT_NIP];
 411
 412         npc = critical_find_restart_point(pc);
 413
 414         if (npc != NULL)
 415                 _gregs[PT_NIP] = (ptrint) npc;
 416 }
 417 #endif
 418
 419
 420 /*
 421  * These are local overrides for various environment variables in Emacs.
 422  * Please do not remove this and leave it at the end of the file, where
 423  * Emacs will automagically detect them.
 424  * ---------------------------------------------------------------------
 425  * Local variables:
 426  * mode: c
 427  * indent-tabs-mode: t
 428  * c-basic-offset: 4
 429  * tab-width: 4
 430  * End:
 431  */