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