13 lines
404 B
ArmAsm
13 lines
404 B
ArmAsm
// assembler trampoline to let printf (compiled -mpcrel) indirectly reference __MBAR
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.global 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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