+ /* 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;
+ }
+
+ /* generate appropriate exception */
+
+ o = exceptions_new_hardware_exception(NULL, sp, ra, xpc, type, val);
+
+ /* set registers */
+
+ _mc->gregs[REG_RAX] = (ptrint) o;