Re: [Mingw-users] Re: How to build kernel level .sys file?

[Casper H. <ch...@us...>]

On Sunday 20 January 2002 00:01, you wrote:
> Just an update -- I managed to add the definitions that were failing
> back into the file.def to recreate the import library and so I got the
> final '.dll' to compile.. its just I'm not sure if its really identical to
> a '.sys' because
> when I installed the driver it shows up as disabled and is listed as
> corrupted
> or missing in the device manager.
>
> I'm getting closer but could still use some more clarification on making
> .sys files ;) These are the ones that go into \windows\system32\drivers

Windows NT will not load drivers that do not have a correct checksum.
You can apply this patch to binutils to solve the problem:

http://sources.redhat.com/ml/binutils/2002-01/msg00395.html

It writes a checksum to a PE image.

Alternatively you can search for a tool that will do the same and use it on 
an image generated with MinGW.

Here is an example of a makefile that will generate a .sys file that Windows 
NT will load (if ld has the checksum patch applied).


TOOLBASE = /usr/local/cross-tools/bin

GCC = $(TOOLBASE)/i386-mingw32msv-gcc
DLLTOOL = $(TOOLBASE)/i386-mingw32msv-dlltool

BASENAME = null

FULLNAME = $(BASENAME).sys
CFLAGS = -I../

OBJECTS = $(BASENAME).o

DDKLIBS = ntoskrnl.a

all: $(FULLNAME)

$(FULLNAME): $(OBJECTS)
	$(GCC) -Wl,--base-file,base.tmp \
		-Wl,--entry,_DriverEntry \
		-nostartfiles -nostdlib \
		-o junk.tmp \
		$(OBJECTS) $(DDKLIBS)
	$(DLLTOOL) --dllname $(FULLNAME) \
		--base-file base.tmp \
		--output-exp temp.exp
	$(GCC) $(TARGET_LFLAGS) \
                	-Wl,--subsystem,native \
		-Wl,--image-base,0x10000 \
		-Wl,--file-alignment,0x1000 \
		-Wl,--section-alignment,0x1000 \
		-Wl,--entry,_DriverEntry \
		-Wl,temp.exp \
		-mdll -nostartfiles -nostdlib \
		-o $(FULLNAME) \
	  	$(OBJECTS) $(DDKLIBS)

%.o: %.c
	$(GCC) $(CFLAGS) -c $< -o $@
 
Casper Hornstrup