Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- $Id: md.c 7249 2007-01-29 19:32:52Z twisti $
-
*/
#include "config.h"
#include <assert.h>
+#include <stdint.h>
#include <stdlib.h>
#include <ucontext.h>
+#include "vm/types.h"
+
+#include "vm/jit/x86_64/codegen.h"
+
#if defined(ENABLE_THREADS)
# include "threads/native/threads.h"
#endif
+#include "vm/exceptions.h"
#include "vm/signallocal.h"
#include "vm/jit/asmpart.h"
/* md_signal_handler_sigsegv ***************************************************
- NullPointerException signal handler for hardware null pointer
- check.
+ Signal handler for hardware exception.
*******************************************************************************/
void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
+ stackframeinfo sfi;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *sp;
+ u1 *ra;
+ u1 *xpc;
+ u1 opc;
+ u1 mod;
+ u1 rm;
+ s4 d;
+ s4 disp;
+ int type;
+ intptr_t val;
+ void *p;
_uc = (ucontext_t *) _p;
_mc = &_uc->uc_mcontext;
threads_check_stackoverflow(sp);
#endif
- _mc->gregs[REG_RAX] =
- (ptrint) stacktrace_hardware_nullpointerexception(NULL, sp, ra, xpc);
-
- _mc->gregs[REG_R10] = (ptrint) xpc; /* REG_ITMP2_XPC */
- _mc->gregs[REG_RIP] = (ptrint) asm_handle_exception;
+ /* 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 == 4)) {
+ /* 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;
+
+ /* XXX FIX ME! */
+
+ /* ATTENTION: The _mc->gregs layout is even worse than on
+ i386! See /usr/include/sys/ucontext.h. We need a
+ switch-case here... */
+
+ switch (d) {
+ case 0: /* REG_RAX == 13 */
+ d = REG_RAX;
+ break;
+ case 1: /* REG_RCX == 14 */
+ d = REG_RCX;
+ break;
+ case 2: /* REG_RDX == 12 */
+ d = REG_RDX;
+ break;
+ case 3: /* REG_RBX == 11 */
+ d = REG_RBX;
+ break;
+ case 4: /* REG_RSP == 15 */
+ d = REG_RSP;
+ break;
+ case 5: /* REG_RBP == 10 */
+ d = REG_RBP;
+ break;
+ case 6: /* REG_RSI == 9 */
+ d = REG_RSI;
+ break;
+ case 7: /* REG_RDI == 8 */
+ d = REG_RDI;
+ break;
+ case 8: /* REG_R8 == 0 */
+ case 9: /* REG_R9 == 1 */
+ case 10: /* REG_R10 == 2 */
+ case 11: /* REG_R11 == 3 */
+ case 12: /* REG_R12 == 4 */
+ case 13: /* REG_R13 == 5 */
+ case 14: /* REG_R14 == 6 */
+ case 15: /* REG_R15 == 7 */
+ d = d - 8;
+ break;
+ }
+
+ val = _mc->gregs[d];
+ }
+ else {
+ /* this was a normal NPE */
+
+ type = EXCEPTION_HARDWARE_NULLPOINTER;
+ val = 0;
+ }
+
+ /* create stackframeinfo */
+
+ stacktrace_create_extern_stackframeinfo(&sfi, NULL, sp, ra, xpc);
+
+ /* Handle the type. */
+
+ p = signal_handle(xpc, type, val);
+
+ /* remove stackframeinfo */
+
+ stacktrace_remove_stackframeinfo(&sfi);
+
+ /* set registers */
+
+ _mc->gregs[REG_RAX] = (intptr_t) p;
+ _mc->gregs[REG_R10] = (intptr_t) xpc; /* REG_ITMP2_XPC */
+ _mc->gregs[REG_RIP] = (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;
+ stackframeinfo sfi;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *pv;
+ u1 *sp;
+ u1 *ra;
+ u1 *xpc;
+ int type;
+ intptr_t val;
+ void *p;
_uc = (ucontext_t *) _p;
_mc = &_uc->uc_mcontext;
/* ATTENTION: Don't use CACAO's internal REG_* defines as they are
different to the ones in <ucontext.h>. */
+ pv = NULL;
sp = (u1 *) _mc->gregs[REG_RSP];
xpc = (u1 *) _mc->gregs[REG_RIP];
ra = xpc; /* return address is equal to xpc */
- _mc->gregs[REG_RAX] =
- (ptrint) stacktrace_hardware_arithmeticexception(NULL, sp, ra, xpc);
+ /* this is an ArithmeticException */
+
+ type = EXCEPTION_HARDWARE_ARITHMETIC;
+ val = 0;
+
+ /* create stackframeinfo */
+
+ stacktrace_create_extern_stackframeinfo(&sfi, pv, sp, ra, xpc);
+
+ /* Handle the type. */
+
+ p = signal_handle(xpc, type, val);
- _mc->gregs[REG_R10] = (ptrint) xpc; /* REG_ITMP2_XPC */
- _mc->gregs[REG_RIP] = (ptrint) asm_handle_exception;
+ /* remove stackframeinfo */
+
+ stacktrace_remove_stackframeinfo(&sfi);
+
+ /* set registers */
+
+ _mc->gregs[REG_RAX] = (intptr_t) p;
+ _mc->gregs[REG_R10] = (intptr_t) xpc; /* REG_ITMP2_XPC */
+ _mc->gregs[REG_RIP] = (intptr_t) asm_handle_exception;
}
#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 thread_restartcriticalsection(ucontext_t *_uc)
+void md_critical_section_restart(ucontext_t *_uc)
{
mcontext_t *_mc;
u1 *pc;
- void *critical;
+ u1 *npc;
_mc = &_uc->uc_mcontext;
- pc = _mc->gregs[REG_RIP];
+ /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
+ different to the ones in <ucontext.h>. */
+
+ pc = (u1 *) _mc->gregs[REG_RIP];
- critical = critical_find_restart_point();
+ npc = critical_find_restart_point(pc);
- if (critical != NULL)
- _mc->gregs[REG_RIP] = (ptrint) critical;
+ if (npc != NULL)
+ _mc->gregs[REG_RIP] = (ptrint) npc;
}
#endif