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