28 Sep
2004
28 Sep
'04
3:53 p.m.
On Sat, Feb 11, 2006 at 11:39:25PM -0500, Sean 'Captain Napalm' Conner wrote:
Okay, figured out why my code didn't work, and
it's not due to writing to
the wrong location (although I suspect that still is a problem) but that
under Unix the code pages are marked read-only so of course it core dumped.
-spc (Another reason why self-modifying code is hard to do in C 8-P
But there are C compilers for the 68000, 6502, etc., for OSes that do _not_
require an MMU or other enforcement hardware (like AmigaDOS), let alone for
standalone programs for embedded environments (we had a C compiler for the
68000 for our COMBOARDs - 100% of the code was our own - no OS).
Some variant of your technique would work in any of those environments; the
'restriction' in this case is a UNIX one, not a C one.
-ethan
--
Ethan Dicks, A-130-S Current South Pole Weather at 29-Sep-2004 03:50 Z
South Pole Station
PSC 468 Box 400 Temp -55.2 F (-48.5 C) Windchill -99 F (-72.8 C)
APO AP 96598 Wind 23.1 kts Grid 011 Barometer 683.1 mb (10508. ft)
Ethan.Dicks(a)amanda.spole.gov http://penguincentral.com/penguincentral.html