/* src/vm/jit/i386/linux/md-os.c - machine dependent i386 Linux functions
- Copyright (C) 1996-2005 R. Grafl, A. Krall, C. Kruegel, C. Oates,
- R. Obermaisser, M. Platter, M. Probst, S. Ring, E. Steiner,
- C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich, J. Wenninger,
- Institut f. Computersprachen - TU Wien
+ Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
+ C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
+ E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
+ J. Wenninger, Institut f. Computersprachen - TU Wien
This file is part of CACAO.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA.
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA.
- Contact: cacao@complang.tuwien.ac.at
-
- Authors: Christian Thalinger
-
- Changes:
-
- $Id: md-os.c 2971 2005-07-10 15:33:54Z twisti $
+ $Id: md-os.c 7918 2007-05-20 20:42:18Z michi $
*/
#define _GNU_SOURCE /* include REG_ defines from ucontext.h */
+#include "config.h"
+
#include <ucontext.h>
+#include "vm/types.h"
+
+#if defined(ENABLE_GC_CACAO)
+# include "mm/cacao-gc/gc.h"
+#endif
+
+#include "vm/jit/i386/codegen.h"
+
+#include "threads/threads-common.h"
+
#include "vm/exceptions.h"
-#include "vm/options.h"
+#include "vm/signallocal.h"
#include "vm/stringlocal.h"
+
#include "vm/jit/asmpart.h"
#include "vm/jit/stacktrace.h"
-/* signal_handler_sigsegv ******************************************************
+/* md_signal_handler_sigsegv ***************************************************
- NullPointerException signal handler for hardware null pointer check.
+ Signal handler for hardware exceptions.
*******************************************************************************/
-void signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
+void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- stackframeinfo *sfi;
- u1 *sp;
- functionptr ra;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *pv;
+ u1 *sp;
+ u1 *ra;
+ u1 *xpc;
+ u1 opc;
+ u1 mod;
+ u1 rm;
+ s4 d;
+ s4 disp;
+ ptrint val;
+ s4 type;
+ java_objectheader *o;
_uc = (ucontext_t *) _p;
_mc = &_uc->uc_mcontext;
- /* allocate stackframeinfo on heap */
+ pv = NULL; /* is resolved during stackframeinfo creation */
+ sp = (u1 *) _mc->gregs[REG_ESP];
+ xpc = (u1 *) _mc->gregs[REG_EIP];
+ ra = xpc; /* return address is equal to XPC */
- sfi = NEW(stackframeinfo);
+ /* get exception-throwing instruction */
- /* create exception */
+ opc = M_ALD_MEM_GET_OPC(xpc);
+ mod = M_ALD_MEM_GET_MOD(xpc);
+ rm = M_ALD_MEM_GET_RM(xpc);
- sp = (u1 *) _mc->gregs[REG_ESP];
- ra = (functionptr) _mc->gregs[REG_EIP];
+ /* for values see emit_mov_mem_reg and emit_mem */
+
+ if ((opc == 0x8b) && (mod == 0) && (rm == 5)) {
+ /* this was a hardware-exception */
+
+ d = M_ALD_MEM_GET_REG(xpc);
+ disp = M_ALD_MEM_GET_DISP(xpc);
+
+ /* we use the exception type as load displacement */
- stacktrace_create_inline_stackframeinfo(sfi, NULL, sp, ra);
+ type = disp;
- _mc->gregs[REG_EAX] = (ptrint) new_nullpointerexception();
+ /* ATTENTION: The _mc->gregs layout is completely crazy! The
+ registers are reversed starting with number 4 for REG_EDI
+ (see /usr/include/sys/ucontext.h). We have to convert that
+ here. */
- stacktrace_remove_stackframeinfo(sfi);
+ val = _mc->gregs[REG_EAX - d];
+ }
+ else {
+ /* this was a normal NPE */
- FREE(sfi, stackframeinfo);
+ type = EXCEPTION_HARDWARE_NULLPOINTER;
+ }
- _mc->gregs[REG_ECX] = _mc->gregs[REG_EIP]; /* REG_ITMP2_XPC */
+ /* generate appropriate exception */
+
+ o = exceptions_new_hardware_exception(pv, sp, ra, xpc, type, val);
+
+ /* set registers */
+
+ _mc->gregs[REG_EAX] = (ptrint) o;
+ _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
_mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
}
-/* signal_handler_sigfpe *******************************************************
+/* md_signal_handler_sigfpe ****************************************************
- ArithmeticException signal handler for hardware divide by zero check.
+ ArithmeticException signal handler for hardware divide by zero
+ check.
*******************************************************************************/
-void signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
+void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- stackframeinfo *sfi;
- u1 *sp;
- functionptr ra;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *pv;
+ u1 *sp;
+ u1 *ra;
+ u1 *xpc;
+ s4 type;
+ ptrint val;
+ java_objectheader *o;
_uc = (ucontext_t *) _p;
_mc = &_uc->uc_mcontext;
- /* allocate stackframeinfo on heap */
+ pv = NULL; /* is resolved during stackframeinfo creation */
+ sp = (u1 *) _mc->gregs[REG_ESP];
+ xpc = (u1 *) _mc->gregs[REG_EIP];
+ ra = xpc; /* return address is equal to xpc */
+
+ /* this is an ArithmeticException */
- sfi = NEW(stackframeinfo);
+ type = EXCEPTION_HARDWARE_ARITHMETIC;
+ val = 0;
- /* create exception */
+ /* generate appropriate exception */
+
+ o = exceptions_new_hardware_exception(pv, sp, ra, xpc, type, val);
+
+ _mc->gregs[REG_EAX] = (ptrint) o;
+ _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
+ _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
+}
+
+
+/* md_signal_handler_sigusr1 ***************************************************
+
+ Signal handler for suspending threads.
+
+*******************************************************************************/
+#if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
+void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
+{
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *pc;
+ u1 *sp;
+
+ _uc = (ucontext_t *) _p;
+ _mc = &_uc->uc_mcontext;
+
+ /* assume there is a GC pending */
+ assert(gc_pending);
+
+ /* get the PC and SP for this thread */
+ pc = (u1 *) _mc->gregs[REG_EIP];
sp = (u1 *) _mc->gregs[REG_ESP];
- ra = (functionptr) _mc->gregs[REG_EIP];
- stacktrace_create_inline_stackframeinfo(sfi, NULL, sp, ra);
+ /* now suspend the current thread */
+ threads_suspend_ack(pc, sp);
+}
+#endif
- _mc->gregs[REG_EAX] = (ptrint) new_arithmeticexception();
- stacktrace_remove_stackframeinfo(sfi);
+/* md_signal_handler_sigusr2 ***************************************************
- FREE(sfi, stackframeinfo);
+ Signal handler for profiling sampling.
- _mc->gregs[REG_ECX] = _mc->gregs[REG_EIP]; /* REG_ITMP2_XPC */
- _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
+*******************************************************************************/
+
+#if defined(ENABLE_THREADS)
+void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
+{
+ threadobject *t;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *pc;
+
+ t = THREADOBJECT;
+
+ _uc = (ucontext_t *) _p;
+ _mc = &_uc->uc_mcontext;
+
+ pc = (u1 *) _mc->gregs[REG_EIP];
+
+ t->pc = pc;
}
+#endif
+
+/* md_critical_section_restart *************************************************
-#if defined(USE_THREADS) && defined(NATIVE_THREADS)
-void thread_restartcriticalsection(ucontext_t *uc)
+ Search the critical sections tree for a matching section and set
+ the PC to the restart point, if necessary.
+
+*******************************************************************************/
+
+#if defined(ENABLE_THREADS)
+void md_critical_section_restart(ucontext_t *_uc)
{
- void *critical;
+ mcontext_t *_mc;
+ u1 *pc;
+ void *npc;
+
+ _mc = &_uc->uc_mcontext;
+
+ pc = (u1 *) _mc->gregs[REG_EIP];
- critical = thread_checkcritical((void *) uc->uc_mcontext.gregs[REG_EIP]);
+ npc = critical_find_restart_point(pc);
- if (critical)
- uc->uc_mcontext.gregs[REG_EIP] = (ptrint) critical;
+ if (npc != NULL) {
+ log_println("md_critical_section_restart: pc=%p, npc=%p", pc, npc);
+ _mc->gregs[REG_EIP] = (ptrint) npc;
+ }
}
#endif
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