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