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Because the debug port uses instructions for most operations, the debug code
will clobber registers used by the running program. Save and restore these
to avoid corrupting application data.
If the ROM file is known, use that to return data instead of fetching it
from the target to improve performance.
Signed-off-by: Keith Packard <keithp@keithp.com>
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The DPL and ACC registers are used by the memory access code,
so they need to be saved and restored. Stuff them up high in ram for now;
this should probably be fixed to pull them back to the host instead.
Special SFR access is required as not all SFRs are visible in the unified
address space.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This makes it default to not being presented, which makes s51 much happier
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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