[sdcc-devel] [ sdcc-Bugs-1961866 ] pic16: data pointers instead of code pointers

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Bugs item #1961866, was opened at 2008-05-11 15:02
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Category: pic16 target
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Andreas Czechanowski (acz)
Assigned to: Nobody/Anonymous (nobody)
Summary: pic16: data pointers instead of code pointers

Initial Comment:
sdcc incorrectly writes pointers to data (bits 23:22 = "10") in arrays pointing to other arrays which definitely reside in code space.

A stripped-down example is attached, compile with:
sdcc -mpic16 -p18f2550 -c ptr_code_ptr.c

the produced ptr_code_ptr.lst shows:

000A           00034 _boot_ep_fail:
000A 0000 0080 00035         DB      LOW(_boot_ep_init_cfg1), HIGH(_boot_ep_init_cfg1), 0x80, LOW(_boot_ep_init_cfg1), HIGH(_boot_ep_init_cfg1), 0x80
000E 8000

The only solution found is to include a __code directive in the array definition. This gives:

0010           00037 _boot_ep_pass:
0010 0000 0000 00038         DB      LOW(_boot_ep_init_cfg1), HIGH(_boot_ep_init_cfg1), UPPER(_boot_ep_init_cfg1), LOW(_boot_ep_init_cfg1), HIGH(_boot_ep_init_cfg1), UPPER(_boot_ep_init_cfg1)
0014 0000

The problem showed when trying to build the PIC USB Framework (see http://vasco.gforge.enseeiht.fr/).
It failed with sdcc-2.8.0 (SDCC : mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08 2.8.0 #5117 (May  1 2008) (UNIX)),
succeeded with sdcc-2.7.0 and older versions.

Regards,
Andreas.


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