[sdcc-devel] [ sdcc-Feature Requests-1600296 ] #pragma xdataseg <name>, #pragma (x|i|o|p|)dataseg <name> ()

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Feature Requests item #1600296, was opened at 2006-11-21 11:38
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Category: None
Group: None
Status: Open
Priority: 5
Private: No
Submitted By: Frieder Ferlemann (frief)
Assigned to: Nobody/Anonymous (nobody)
Summary: #pragma xdataseg <name>, #pragma (x|i|o|p|)dataseg <name> ()

Initial Comment:
while it is possible to specify the name of code
and const segments (#pragma constseg <name>
and #pragma codeseg <name>)
there is no way to set the segment names for xdata, 
data, idata, pdata, or the data overlay segment.

This would allow to address at least three rationales:

a) easy use of noncontiguous xdata memory 
   (as found f.e. in some USB devices)

b) allowing to overlay data/xdata memory 'by hand'
   (addressing SDCC's shortcomings in handling 
   the sparse data memory)
   "#pragma dataseg MY_SEGMENT (OVR,DATA)"
   with the optional bracketed argument passed to
   the linker
   (or "#pragma dataseg OSEG" which would map
   the data segment to the segment OSEG)

c) allowing for a low overhead solution for 
   "How to point to end of used memory?" as proposed 
   by Russ in:
   http://www.8052.com/forum/read.phtml?id=128332


Ideally these pragmas would be compatible with #pragma save and #pragma restore, so existing source files 
wouldn't have to be ripped apart to be able to 
overlay specific functions (or to have their xdata
located at specific segments).

Greetings,
Frieder

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