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