/* src/vm/jit/i386/linux/md-os.c - machine dependent i386 Linux functions
- Copyright (C) 1996-2005, 2006 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, 2008
+ CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
This file is part of CACAO.
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- Contact: cacao@cacaojvm.org
-
- Authors: Christian Thalinger
-
- Changes:
-
- $Id: md-os.c 7480 2007-03-08 12:46:19Z michi $
-
*/
#include "config.h"
+#include <stdint.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 "vm/jit/i386/md.h"
+
+#include "threads/thread.h"
+#include "vm/builtin.h"
#include "vm/exceptions.h"
#include "vm/signallocal.h"
#include "vm/stringlocal.h"
+
#include "vm/jit/asmpart.h"
+#include "vm/jit/executionstate.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;
+ void *p;
+ java_object_t *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);
+
+ /* 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];
+
+ if (type == EXCEPTION_HARDWARE_COMPILER) {
+ /* The PV from the compiler stub is equal to the XPC. */
+
+ pv = xpc;
+
+ /* We use a framesize of zero here because the call pushed
+ the return addres onto the stack. */
+
+ ra = md_stacktrace_get_returnaddress(sp, 0);
+
+ /* Skip the RA on the stack. */
+
+ sp = sp + 1 * SIZEOF_VOID_P;
+
+ /* The XPC is the RA minus 2, because the RA points to the
+ instruction after the call. */
- _mc->gregs[REG_EAX] =
- (ptrint) stacktrace_hardware_nullpointerexception(NULL, sp, ra, xpc);
+ xpc = ra - 2;
+ }
+ }
+ else {
+ /* this was a normal NPE */
- _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
- _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
+ type = EXCEPTION_HARDWARE_NULLPOINTER;
+ val = 0;
+ }
+
+ /* Handle the type. */
+
+ p = signal_handle(type, val, pv, sp, ra, xpc, _p);
+
+ /* Set registers. */
+
+ if (type == EXCEPTION_HARDWARE_COMPILER) {
+ if (p == NULL) {
+ o = builtin_retrieve_exception();
+
+ _mc->gregs[REG_ESP] = (uintptr_t) sp; /* Remove RA from stack. */
+
+ _mc->gregs[REG_EAX] = (uintptr_t) o;
+ _mc->gregs[REG_ECX] = (uintptr_t) xpc; /* REG_ITMP2_XPC */
+ _mc->gregs[REG_EIP] = (uintptr_t) asm_handle_exception;
+ }
+ else {
+ _mc->gregs[REG_EIP] = (uintptr_t) p;
+ }
+ }
+ else {
+ _mc->gregs[REG_EAX] = (intptr_t) p;
+ _mc->gregs[REG_ECX] = (intptr_t) xpc; /* REG_ITMP2_XPC */
+ _mc->gregs[REG_EIP] = (intptr_t) 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;
+ void *p;
_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;
+
+ /* Handle the type. */
- _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
- _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
+ p = signal_handle(type, val, pv, sp, ra, xpc, _p);
+
+ /* set registers */
+
+ _mc->gregs[REG_EAX] = (intptr_t) p;
+ _mc->gregs[REG_ECX] = (intptr_t) xpc; /* REG_ITMP2_XPC */
+ _mc->gregs[REG_EIP] = (intptr_t) asm_handle_exception;
+}
+
+
+/* md_signal_handler_sigill ****************************************************
+
+ Signal handler for hardware patcher traps (ud2).
+
+*******************************************************************************/
+
+void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p)
+{
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *pv;
+ u1 *sp;
+ u1 *ra;
+ u1 *xpc;
+ s4 type;
+ ptrint val;
+ void *p;
+
+ _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 */
+
+ /* this is an ArithmeticException */
+
+ type = EXCEPTION_HARDWARE_PATCHER;
+ val = 0;
+
+ /* generate appropriate exception */
+
+ p = signal_handle(type, val, pv, sp, ra, xpc, _p);
+
+ /* set registers (only if exception object ready) */
+
+ if (p != NULL) {
+ _mc->gregs[REG_EAX] = (ptrint) p;
+ _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
+ _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
+ }
}
/* md_signal_handler_sigusr1 ***************************************************
- Signale handler the exact GC to suspend threads.
+ 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)
{
- threadobject *t;
- executionstate_t *es;
- ucontext_t *_uc;
- mcontext_t *_mc;
-
- t = THREADOBJECT;
- t->es = NEW(executionstate_t); /* TODO: this must be done before!!! */
- es = t->es;
+ 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);
-
- /* fill in the execution state of this thread */
- es->pc = (u1 *) _mc->gregs[REG_EIP];
- es->sp = (u1 *) _mc->gregs[REG_ESP];
- es->pv = (u1 *) NULL;
-
- /* TODO: int registers are missing */
+ /* 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 for GC */
- gc_suspend(t, _uc);
+ /* now suspend the current thread */
+ threads_suspend_ack(pc, sp);
}
#endif
#endif
+/* md_executionstate_read ******************************************************
+
+ Read the given context into an executionstate for Replacement.
+
+*******************************************************************************/
+
+void md_executionstate_read(executionstate_t *es, void *context)
+{
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ s4 i;
+
+ _uc = (ucontext_t *) context;
+ _mc = &_uc->uc_mcontext;
+
+ /* read special registers */
+ es->pc = (u1 *) _mc->gregs[REG_EIP];
+ es->sp = (u1 *) _mc->gregs[REG_ESP];
+ es->pv = NULL; /* pv must be looked up via AVL tree */
+
+ /* read integer registers */
+ for (i = 0; i < INT_REG_CNT; i++)
+ es->intregs[i] = _mc->gregs[REG_EAX - i];
+
+ /* read float registers */
+ for (i = 0; i < FLT_REG_CNT; i++)
+ es->fltregs[i] = 0xdeadbeefdeadbeefULL;
+}
+
+
+/* md_executionstate_write *****************************************************
+
+ Write the given executionstate back to the context for Replacement.
+
+*******************************************************************************/
+
+void md_executionstate_write(executionstate_t *es, void *context)
+{
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ s4 i;
+
+ _uc = (ucontext_t *) context;
+ _mc = &_uc->uc_mcontext;
+
+ /* write integer registers */
+ for (i = 0; i < INT_REG_CNT; i++)
+ _mc->gregs[REG_EAX - i] = es->intregs[i];
+
+ /* write special registers */
+ _mc->gregs[REG_EIP] = (ptrint) es->pc;
+ _mc->gregs[REG_ESP] = (ptrint) es->sp;
+}
+
+
+/* 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 thread_restartcriticalsection(ucontext_t *uc)
+void md_critical_section_restart(ucontext_t *_uc)
{
- void *critical;
+ mcontext_t *_mc;
+ u1 *pc;
+ u1 *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)
+ _mc->gregs[REG_EIP] = (ptrint) npc;
}
#endif
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