/* src/vm/jit/i386/linux/md-os.c - machine dependent i386 Linux functions
- Copyright (C) 1996-2005, 2006 R. Grafl, A. Krall, C. Kruegel,
+ 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
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- Contact: cacao@cacaojvm.org
-
- Authors: Christian Thalinger
-
- Changes:
-
- $Id: md-os.c 4908 2006-05-12 16:49:50Z edwin $
+ $Id: md-os.c 7918 2007-05-20 20:42:18Z michi $
*/
#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/signallocal.h"
#include "vm/stringlocal.h"
+
#include "vm/jit/asmpart.h"
#include "vm/jit/stacktrace.h"
/* md_signal_handler_sigsegv ***************************************************
- NullPointerException signal handler for hardware null pointer
- check.
+ Signal handler for hardware exceptions.
*******************************************************************************/
void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
+ 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;
+ 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 */
+ ra = xpc; /* return address is equal to XPC */
+
+ /* get exception-throwing instruction */
+
+ opc = M_ALD_MEM_GET_OPC(xpc);
+ mod = M_ALD_MEM_GET_MOD(xpc);
+ rm = M_ALD_MEM_GET_RM(xpc);
+
+ /* 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);
- _mc->gregs[REG_EAX] =
- (ptrint) stacktrace_hardware_nullpointerexception(NULL, sp, ra, xpc);
+ /* we use the exception type as load displacement */
+ type = disp;
+
+ /* 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. */
+
+ val = _mc->gregs[REG_EAX - d];
+ }
+ else {
+ /* this was a normal NPE */
+
+ type = EXCEPTION_HARDWARE_NULLPOINTER;
+ }
+
+ /* 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;
}
void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
+ 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;
+ 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 */
- _mc->gregs[REG_EAX] =
- (ptrint) stacktrace_hardware_arithmeticexception(NULL, sp, ra, xpc);
+ /* this is an ArithmeticException */
+
+ type = EXCEPTION_HARDWARE_ARITHMETIC;
+ val = 0;
+
+ /* 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;
}
-#if defined(USE_THREADS) && defined(NATIVE_THREADS)
-void thread_restartcriticalsection(ucontext_t *uc)
+/* 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)
{
- void *critical;
+ 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];
+
+ /* now suspend the current thread */
+ threads_suspend_ack(pc, sp);
+}
+#endif
+
+
+/* md_signal_handler_sigusr2 ***************************************************
+
+ Signal handler for profiling sampling.
+
+*******************************************************************************/
+
+#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 *************************************************
+
+ 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)
+{
+ mcontext_t *_mc;
+ u1 *pc;
+ void *npc;
+
+ _mc = &_uc->uc_mcontext;
+
+ pc = (u1 *) _mc->gregs[REG_EIP];
- critical = critical_find_restart_point((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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