+ unsigned int dst, cnt;
+ unsigned char flags;
+
+ /* ASR, dest, count
+ while (count != 0)
+ C = dest.0; dest >>= 1;
+ this is a confusing one...
+ */
+
+ flags = get_psw();
+ flags &= ~BIT_ALL; /* clear these bits */
+
+ switch(operands) {
+ case REG_REG :
+ cnt = reg1(RI_0F) & 0x1f;
+ switch (code & 0xc00) {
+ case 0: // byte
+ dst = reg1(RI_F0);
+ if ((cnt != 0) && (dst & (0x00000001 << (cnt-1))))
+ flags |= BIT_C;
+ if (dst & 0x01)
+ flags |= BIT_C;
+ dst >>= cnt;
+ set_reg1(RI_F0,dst);
+ if ((dst & 0xff) == 0)
+ flags |= BIT_Z;
+ break;
+ case 1: // word
+ dst = reg2(RI_F0);
+ if ((cnt != 0) && (dst & (0x00000001 << (cnt-1))))
+ flags |= BIT_C;
+ dst >>= cnt;
+ set_reg2(RI_F0,dst);
+ if ((dst & 0xffff) == 0)
+ flags |= BIT_Z;
+ break;
+ case 2: // ?
+ // not really sure about the encoding here..
+ NOTDONE_ASSERT;
+ break;
+ case 3: // dword
+ dst = reg2(RI_F0) | (reg2(RI_F0 + 2) << 16);
+ if ((cnt != 0) && (dst & (0x00000001 << (cnt-1))))
+ flags |= BIT_C;
+ dst >>= cnt;
+ set_reg2(RI_F0,dst & 0xffff);
+ set_reg2(RI_F0+2, (dst>>16) & 0xffff);
+ if (dst == 0)
+ flags |= BIT_Z;
+ break;
+ }
+ break;
+
+ case REG_DATA4 :
+ case REG_DATA5 :
+ switch (code & 0xc00) {
+ case 0: // byte
+ dst = reg1(RI_F0);
+ cnt = operands & 0x0f;
+ if ((cnt != 0) && (dst & (0x00000001 << (cnt-1))))
+ flags |= BIT_C;
+ dst >>= cnt;
+ set_reg1(RI_F0,dst);
+ if ((dst & 0xff) == 0)
+ flags |= BIT_Z;
+ break;
+ case 1: // word
+ dst = reg2(RI_F0);
+ cnt = operands & 0x0f;
+ if ((cnt != 0) && (dst & (0x00000001 << (cnt-1))))
+ flags |= BIT_C;
+ dst >>= cnt;
+ set_reg2(RI_F0,dst);
+ if ((dst & 0xffff) == 0)
+ flags |= BIT_Z;
+ break;
+ case 2: // ?
+ // not really sure about the encoding here..
+ NOTDONE_ASSERT;
+ break;
+ case 3: // dword
+ dst = reg1(RI_F0 & 0xe);
+ cnt = operands & 0x1f;
+ if ((cnt != 0) && (dst & (0x00000001 << (cnt-1))))
+ flags |= BIT_C;
+ dst >>= cnt;
+ set_reg2(RI_F0,dst & 0xffff);
+ set_reg2(RI_F0+2, (dst>>16) & 0xffff);
+ if (dst == 0)
+ flags |= BIT_Z;
+ break;
+ }
+ break;
+ }
+ set_psw(flags);
+