Re: I can not build a new kernel image with a assembly module

["linux-os \(Dick Johnson\)" <linux-os@analogic.com>]

On Mon, 8 Aug 2005, mhb wrote:

> Hi
>
> I had added an assembly program to the networking
> section of kernel linux 2.2.16 without any problem.
> But when I add it to kerenel 2.4.1 I could build that
> kernel, but I faced with kernel panic error when I
> boot
> system with new builded image. I use the following
> Make file to build It in the 2.4.1 kernel.
>
> /*--------------------------------*/
> L_TARGET := libtest.a
>
> obj-$(CONFIG_TEST)		+= test.o
>
> override CFLAGS += -Wpointer-arith
> override CFLAGS += -Wbad-function-cast
> override CFLAGS += -DTERMIO
>
>
> #-----------------------------------------------------------------------------
> # Section 3 - Conversion routines from new style to
> old style for Rules.make
>
> #-----------------------------------------------------------------------------
> # Section 4 - Rules.make section
> include $(TOPDIR)/Rules.make
> #-----------------------------------------------------------------------------
> # Section 5
>
> $(obj-y):  $(TOPDIR)/include/linux/config.h\
>
> $(TOPDIR)/include/linux/autoconf.h
>
> clean:
> 	-rm -f *.o
> tags:
> 	ctags libtest.a
>
> tar:
> 	tar -cvf /dev/f1 .
>
> test.o: test1.o test2.o test3.o
> 	$(LD) -r -o $@ test1.o test2.o test3.o
>
> test3.o: test3.s
> 	$(AS) -o $@ $<
> #-----------------------------------------------------------------------------
> As you can see test3.s is an assembly file.
> I guess this problem is related to this Makefile.
> Is this Make file true?
> How can I win over this problem?
>
> thanks
>

The newer kernels may pass parameters in registers instead of
on the stack. If you haven't done this in the past, you need
to declare your assembly-language modules as:

extern asmlinkage int function(params,...);
        |_________ Parameters on the stack.


To prevent experimental kernels from redefining asmlinkage, I
suggest:

#define OnStack __attribute__((regparm(0)))  // Some header somewhere

extern OnStack int function(params,...);


Here is a typical Makefile to build a module outside the source-code
tree. It has many assembly-language source files.

#
#    This program may be distributed under the GNU Public License
#    version 2, as published by the Free Software Foundation, Inc.,
#    59 Temple Place, Suite 330 Boston, MA, 02111.
#
#    Project Makefile for kernel versions over 6
#    Created 05-OCT-2004    Richard B. Johnson
#
#    Note that macro "obj" refers to this directory when
#    make is executing from the kernel directory.
#

%.o:%.S
 		as -o $@ $<

VERS := $(shell uname -r)
CDIR := $(shell pwd)
MKNOD = /usr/bin/mknodp
FNAM = HeavyLink
EXTRA_CFLAGS += -DKVER6 -DMAJOR_NR=178 -DMODNAME="\"$(FNAM)"\"

OBJS =	datalink.o	min_size_t.o	license.o	ram_test.o\
 	rwcheck.o	seeprom.o	rwreg.o		rnd.o\
 	rdtsc.o		dma_buffer.o	ioctltxt.o

all:		chkhdrs
 		@./chkhdrs
 		@make V=1 -C /usr/src/linux-$(VERS) SUBDIRS=$(CDIR) modules
 		strip -x -R .note -R .comment $(FNAM).ko

obj-m		:= 	$(FNAM).o
$(FNAM)-objs	:=	$(OBJS)
$(obj)/min_size_t.o:	$(obj)/min_size_t.S	$(obj)/Makefile
$(obj)/license.o:	$(obj)/license.c	$(obj)/Makefile
$(obj)/ram_test.o:	$(obj)/ram_test.c	$(obj)/Makefile
$(obj)/rwcheck.o:	$(obj)/rwcheck.S	$(obj)/Makefile
$(obj)/rwreg.o:		$(obj)/rwreg.S		$(obj)/Makefile
$(obj)/rnd.o:		$(obj)/rnd.S		$(obj)/Makefile
$(obj)/rdtsc.o:		$(obj)/rdtsc.S		$(obj)/Makefile
$(obj)/ioctltxt.o:	$(obj)/ioctltxt.s
$(obj)/datalink.o:	$(obj)/datalink.c	$(obj)/datalink.h\
 			$(obj)/config.h		$(obj)/types.h\
 			$(obj)/plx.h		$(obj)/dlb.h\
 			$(obj)/ver.h		$(obj)/Makefile\
 			$(SUBDIRS)/bool.h	$(SUBDIRS)/kver.h
$(obj)/dma_buffer.o:	$(obj)/dma_buffer.c	$(obj)/datalink.h\
 			$(obj)/config.h		$(obj)/Makefile\
 			$(SUBDIRS)/bool.h
$(obj)/seeprom.o:	$(obj)/seeprom.c	$(obj)/plx.h\
 			$(obj)/types.h		$(obj)/Makefile

chkhdrs:	../tools/chkhdrs.c
 	gcc -O2 -Wall -o chkhdrs ../tools/chkhdrs.c

$(SUBDIRS)/chktrue:	$(SUBDIRS)/../tools/chktrue.c
 	gcc -O2 -Wall -o $(SUBDIRS)/chktrue $(SUBDIRS)/../tools/chktrue.c

$(SUBDIRS)/bool.h:	$(SUBDIRS)/chktrue
 	cd $(SUBDIRS) ; $(SUBDIRS)/chktrue

$(SUBDIRS)/mkioctltxt:	$(SUBDIRS)/mkioctltxt.c
 	gcc -O2 -Wall -o $(SUBDIRS)/mkioctltxt $(SUBDIRS)/mkioctltxt.c

$(SUBDIRS)/ioctltxt.s:	$(SUBDIRS)/mkioctltxt $(SUBDIRS)/datalink.h
 	cd $(SUBDIRS) ; $(SUBDIRS)/mkioctltxt

$(SUBDIRS)/chkver:	$(SUBDIRS)/../tools/chkver.c
 	gcc -O2 -Wall -o $(SUBDIRS)/chkver $(SUBDIRS)/../tools/chkver.c

$(SUBDIRS)/kver.h:	$(SUBDIRS)/chkver
 	cd $(SUBDIRS) ; $(SUBDIRS)/chkver $(VERS)


install:	install.sh $(MKNOD)
 	@sh install.sh install


$(MKNOD):	../tools/mknodp.c
 	make -C ../tools

clean:
 	rm -rf $(OBJS) $(FNAM).ko $(FNAM).mod.c $(FNAM)*.o \.*.cmd \
chkhdrs \.tmp_versions chktrue bool.h kver.h *.s mkioctltxt chkver
 		@sh install.sh clean



Cheers,
Dick Johnson
Penguin : Linux version 2.6.12 on an i686 machine (5537.79 BogoMips).
Warning : 98.36% of all statistics are fiction.
.
I apologize for the following. I tried to kill it with the above dot :

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