39 lines
1.2 KiB
ArmAsm
39 lines
1.2 KiB
ArmAsm
/*
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* printf_helper.S
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*
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* assembler trampoline to let printf (compiled -mpcrel) indirectly reference __MBAR
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*
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* This file is part of BaS_gcc.
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*
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* BaS_gcc is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* BaS_gcc is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with BaS_gcc. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010 - 2012 F. Aschwanden
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* Copyright 2011 - 2012 V. Riviere
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* Copyright 2012 - 2025 M. Froeschle
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*/
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.globl printf_helper
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printf_helper:
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.extern __MBAR
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.wait_txready:
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move.w __MBAR+0x8604,d2 // PSCSCR0 status register
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btst #10,d2 // space left in TX fifo?
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beq.s .wait_txready // no, loop
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lea __MBAR+0x860C,a0 // PSCSTB0 transmitter buffer register
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move.b d0,(a0) // send byte
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rts
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