[sdcc-devel] [ sdcc-Bugs-3606633 ] TBLPTRx not saved in interrupt

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Bugs item #3606633, was opened at 2013-03-02 11:37
Message generated for change (Tracker Item Submitted) made by hpoetzl
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Category: pic16 target
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Herbert Pötzl (hpoetzl)
Assigned to: Nobody/Anonymous (nobody)
Summary: TBLPTRx not saved in interrupt

Initial Comment:
using const arrays/tables like

  const unsigned char tbl_a[] = { 0, 1, 2, 3 };

on pic16 taget (e.g. pic18f2455) will result in code using the TBLPTRx
registers, but those are not saved in interrupt context, so in case both, the
main code and the interrupt handler use such an array, the TBLPTRx will get
messed up leading to all kind of unexpected behaviour.
(see tblptr.lst for details)

$ sdcc --std-sdcc99 --use-non-free -mpic16 -p18f2455 tblptr.c
$ sdcc --version
SDCC : mcs51/gbz80/z80/z180/r2k/r3ka/ds390/pic16/pic14/TININative/ds400/hc08/s08 3.2.1 #8246 (Dec 17 2012) (Linux)

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=3606633&group_id=599