2008-03-25 07:42:49 how to compile assembler file into a module
sj tian (CHINA)
Message: 53009
I write a char driver, there are two source files, sample_module.c and isr.s , in this driver moudle. But I can not compile this isr.s file.
error message : no rule to creat this object.
the content in my makefile file as following:
obj-m := sample_module.o
sample_module-objs := isr.o
these two files are saved in the same directory. and sample_module.h file announced the fonctions in the isr.s file.
If I did not add isr.s in this driver, and cut "sample_module-objs := isr.o" in makefile, sample_module.c and sample_module.h can compile. but add isr.s flie , this driver module can not compile.
why? there is any question in my makefile? and I need modify other file in kernel? pls give me a hint.
Thanks alot!
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2008-03-25 23:30:01 Re: how to compile assembler file into a module
Mike Frysinger (UNITED STATES)
Message: 53025 try using isr.S
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2008-03-26 04:15:23 Re: how to compile assembler file into a module
sj tian (CHINA)
Message: 53032
Thanks！ That's ok.
There is another problem. I used a globle variable in a function of isr.S,. I defined this globle variable in sample_module.h file. and I anounced this globle variable with ".extern _Data_Offset;" at the start of isr.S. but when compling,
the compilier show a warning: _Data_Offset is undefined.
why?
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2008-03-26 10:08:16 Re: how to compile assembler file into a module
Mike Frysinger (UNITED STATES)
Message: 53057 post a build log rather than just a snippet
putting ".extern" in .S files doesnt really do anything as all symbols not defined are automatically assumed to be external