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 R. Grafl, A. Krall, C. Kruegel,
   4    C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
   5    E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
   6    J. Wenninger, Institut f. Computersprachen - TU Wien
   7
   8    This file is part of CACAO.
   9
  10    This program is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU General Public License as
  12    published by the Free Software Foundation; either version 2, or (at
  13    your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful, but
  16    WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  23    02110-1301, USA.
  24
  25 */
  26
  27
  28 #include "config.h"
  29
  30 #include <assert.h>
  31 #include <stdint.h>
  32 #include <ucontext.h>
  33
  34 #include "vm/types.h"
  35
  36 #include "vm/jit/powerpc/codegen.h"
  37 #include "vm/jit/powerpc/linux/md-abi.h"
  38
  39 #if defined(ENABLE_THREADS)
  40 # include "threads/native/threads.h"
  41 #endif
  42
  43 #include "vm/exceptions.h"
  44 #include "vm/signallocal.h"
  45 #include "vm/stringlocal.h"
  46 #include "vm/jit/asmpart.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
  55 /* md_signal_handler_sigsegv ***************************************************
  56
  57    Signal handler for hardware-exceptions.
  58
  59 *******************************************************************************/
  60
  61 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
  62 {
  63         ucontext_t     *_uc;
  64         mcontext_t     *_mc;
  65         unsigned long  *_gregs;
  66         u1             *pv;
  67         u1             *sp;
  68         u1             *ra;
  69         u1             *xpc;
  70         u4              mcode;
  71         int             s1;
  72         int16_t         disp;
  73         int             d;
  74         intptr_t        addr;
  75         intptr_t        val;
  76         int             type;
  77         void           *p;
  78
  79         _uc = (ucontext_t *) _p;
  80
  81 #if defined(__UCLIBC__)
  82         _mc    = &(_uc->uc_mcontext);
  83         _gregs = _mc->regs->gpr;
  84 #else
  85         _mc    = _uc->uc_mcontext.uc_regs;
  86         _gregs = _mc->gregs;
  87 #endif
  88
  89         pv  = (u1 *) _gregs[REG_PV];
  90         sp  = (u1 *) _gregs[REG_SP];
  91         ra  = (u1 *) _gregs[PT_LNK];                 /* this is correct for leafs */
  92         xpc = (u1 *) _gregs[PT_NIP];
  93
  94         /* get exception-throwing instruction */
  95
  96         mcode = *((u4 *) xpc);
  97
  98         s1   = M_INSTR_OP2_IMM_A(mcode);
  99         disp = M_INSTR_OP2_IMM_I(mcode);
 100         d    = M_INSTR_OP2_IMM_D(mcode);
 101
 102         val  = _gregs[d];
 103
 104         /* check for special-load */
 105
 106         if (s1 == REG_ZERO) {
 107                 /* we use the exception type as load displacement */
 108
 109                 type = disp;
 110
 111                 if (type == EXCEPTION_HARDWARE_COMPILER) {
 112                         /* The XPC is the RA minus 4, because the RA points to the
 113                            instruction after the call. */
 114
 115                         xpc = ra - 4;
 116                 }
 117         }
 118         else {
 119                 /* This is a normal NPE: addr must be NULL and the NPE-type
 120                    define is 0. */
 121
 122                 addr = _gregs[s1];
 123                 type = EXCEPTION_HARDWARE_NULLPOINTER;
 124
 125                 if (addr != 0)
 126                         vm_abort("md_signal_handler_sigsegv: faulting address is not NULL: addr=%p", addr);
 127         }
 128
 129         /* Handle the type. */
 130
 131         p = signal_handle(type, val, pv, sp, ra, xpc, _p);
 132
 133         /* Set registers. */
 134
 135         switch (type) {
 136         case EXCEPTION_HARDWARE_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 = exceptions_get_and_clear_exception();
 152
 153                 assert(p != NULL);
 154
 155                 /* fall-through */
 156
 157         case EXCEPTION_HARDWARE_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 = EXCEPTION_HARDWARE_ARRAYINDEXOUTOFBOUNDS;
 216         val  = _gregs[s1];
 217
 218         /* Handle the type. */
 219
 220         p = signal_handle(type, val, pv, sp, ra, xpc, _p);
 221
 222         /* set registers */
 223
 224         _gregs[REG_ITMP1_XPTR] = (intptr_t) p;
 225         _gregs[REG_ITMP2_XPC]  = (intptr_t) xpc;
 226         _gregs[PT_NIP]         = (intptr_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_critical_section_restart *************************************************
 302
 303    Search the critical sections tree for a matching section and set
 304    the PC to the restart point, if necessary.
 305
 306 *******************************************************************************/
 307
 308 #if defined(ENABLE_THREADS)
 309 void md_critical_section_restart(ucontext_t *_uc)
 310 {
 311         mcontext_t    *_mc;
 312         unsigned long *_gregs;
 313         u1            *pc;
 314         u1            *npc;
 315
 316 #if defined(__UCLIBC__)
 317         _mc    = &(_uc->uc_mcontext);
 318         _gregs = _mc->regs->gpr;
 319 #else
 320         _mc    = _uc->uc_mcontext.uc_regs;
 321         _gregs = _mc->gregs;
 322 #endif
 323
 324         pc = (u1 *) _gregs[PT_NIP];
 325
 326         npc = critical_find_restart_point(pc);
 327
 328         if (npc != NULL)
 329                 _gregs[PT_NIP] = (ptrint) npc;
 330 }
 331 #endif
 332
 333
 334 /*
 335  * These are local overrides for various environment variables in Emacs.
 336  * Please do not remove this and leave it at the end of the file, where
 337  * Emacs will automagically detect them.
 338  * ---------------------------------------------------------------------
 339  * Local variables:
 340  * mode: c
 341  * indent-tabs-mode: t
 342  * c-basic-offset: 4
 343  * tab-width: 4
 344  * End:
 345  */