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Makefile
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1992-08-12
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3KB
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76 lines
#
# Simple makefile & doc for NullHandler & TestNull
#
# $VER: Makefile 37.1 (12.8.92) -- Makefile for NullHandler & TestNull
#
# Exception handler example
#
# Copyright (C) 1992 Compos Mentis Software Systems -- Jesper Kehlet
#
# May be freely redistributed and reused as long as archive is kept in it's
# entirety -- that includes:
#
# Makefile - This is what you're reading - 2672 bytes
# NullHandler - The division by zero exception handler - 216 bytes
# NullHandler.o - The exception handler object file - 232 bytes
# NullHandler.a - - - - source file - 3374 bytes
# TestNull - A small TRAP #5 test program - 44 bytes
# TestNull.o - TestNull object file - 52 bytes
# TestNull.a - - source - - 856 bytes
#
# NullHandler is an example of how easy it is to set up an exception
# handler that can be removed without doing an immense amount of work with
# setting up ports etc.
#
# It is, of course, not bullet-proof, but if you choose an IDENT string
# made up from something like your cat or something -- sure Dave would
# choose IGGY -- it should be fairly unique to any other exception handler,
# that may be installed after this one.
#
# It does not check whether or not we get the memory we want, but since
# it's only 58 bytes, it's not a healthy system if we don't get it, so who
# cares then?
#
# When this handler is installed, it saves the address of the original
# code, so everything is restored properly when run the second time.
#
# When run a second time, it removes itself (if possible), and returns
# WARN to tell you it's no longer there.
#
# So an installation script would be:
#
# NullHandler
# If WARN
# NullHandler
# EndIf
#
# And you can be fairly sure it's installed...
#
# So, if you decide to install some other exception handlers for the same
# vector after this one, you must remove those before this one can find
# itself. This ONLY looks at the currently installed one. That's a
# drawback, but then again, it's small and you don't really install that
# many exception handlers, do you?
#
# This was done with the SAS 5.10b assembler
#
# If you want to port to a68k or something:
# -----------------------------------------
# The assembler flag -m2 suppresses the 68020+ opcode warnings
# - - - -i specifies a path to your include files.
#
# The lvo/ directory I use is for my _LVO-files made by GetLVO.
#
AS = Asm
AFLAGS = -m2 -iAINCLUDE:
LN = BLink
ASRC = NullHandler.a TestNull.a
all: NullHandler.o TestNull.o
$(LN) NullHandler.o
$(LN) TestNull.o
.a.o: NullHandler.a TestNull.a
$(AS) $(AFLAGS) $*