/*
 * printf_helper.S
 *
 * assembler trampoline to let printf (compiled -mpcrel) indirectly reference __MBAR
 *
 * This file is part of BaS_gcc.
 *
 * BaS_gcc is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * BaS_gcc is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with BaS_gcc.  If not, see <http://www.gnu.org/licenses/>.
 */


			.global printf_helper
printf_helper:
			.extern		__MBAR
.wait_txready:
			move.w		__MBAR+0x8604,d2	// PSCSCR0 status register
			btst		#10,d2				// space left in TX fifo?
			beq.s		.wait_txready		// no, loop
			lea			__MBAR+0x860C,a0	// PSCSTB0 transmitter buffer register
			move.b		d0,(a0)				// send byte
			rts