Firebee/BaS_gcc
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Markus Fröschle
2012-11-16 18:57:09 +00:00
parent b57301ca8c
commit 4dafbc7894
81 changed files with 0 additions and 0 deletions
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BaS_gcc/sources/printf_helper.S Normal file
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// assembler trampoline to let printf (compiled -mpcrel) indirectly reference __MBAR
.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