This is the mail archive of the crossgcc@sourceware.org mailing list for the crossgcc project.
See the CrossGCC FAQ for lots more information.
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |
Other format: | [Raw text] |
Hello! Sorry if this has been asked before, but I didn't find it when using Google. I'm trying to set up a m68k-elf toolchain to produce non-libc images. My goal is to have a GNU toolchain for really small systems which can produce binary images from C++ code which can be flashed to a target system. I would like to be able to generate images for the 68hc11 some day. (Another target, I know.) I want to minimize bytecount so I don't want any extra libraries, just the bare mininum for setting up before calling main and destruction of static/global objects after exit of main. I do not need heap allocation and I might skip exceptions also. I have a Makefile which produces a 'hello world', or 'blink the led' in my case. Here it is: --------------------------------------------------------------------------------------------------------------- ATH=/usr/local/m68k TARGET = m68k-elf CC = g++ LD = ld CFLAGS = -c -O3 -m68000 -fno-exceptions TLD = $(PATH)/bin/$(TARGET)-$(LD) TCC = $(PATH)/bin/$(TARGET)-$(CC) TOBJCPY = $(PATH)/bin/$(TARGET)-objcopy CRTP = $(PATH)/lib/gcc/m68k-elf/4.0.1 CRTNP =$(PATH)/m68k-elf/lib all: $(TCC) $(CFLAGS) ambase.cc $(TLD) -T memory.x -L$(PATH)/lib/gcc/m68k-elf/4.0.1 -o a.out ambase.o -liberty $(TOBJCPY) --output-target=binary -j .text a.out a.bin ./mkamigarom --------------------------------------------------------------------------------------------------------------- As you can see I use a separate link step with a memory.x linker script. This has been set up using trial and error and is probably riddled with bugs. Are there any good location to find a good linker script? It should work with gcc-4.0.1, be able to produce a ROM image without using a fullblown libc installation and make sure all neccessary sections are handled. Also, I have problem with atexit(). I'm currently supplying that as an empty function but is there some source I could use instead? Any feedback is appreciated. --- Mikael R PS. For the curious, mkamigarom produce a binary image suitable for loading into the Universal Amiga Emulator uae as a kickstart file. An excellent tool if you do not have an evaluation board. .DS ------ Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ Want to unsubscribe? Send a note to crossgcc-unsubscribe@sources.redhat.com
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |