Sudo Code for kernel module compilation using KBUILD
SYSTEM.
If module versioing is enabled.
step1.
create a .tmp_<moudule name>.o file from <module
name>.c using gcc.
step2.
if objdump -h .tmp_<module name>.o | grep -q
__ksymtab; then
gcc -D GENKSYMS
..............|scripts/genksyms/genksyms >
.tmp_<module name>.ver
ld -m elf_i386 -r -o <module name>.o .tmp_<module
name>.o .tmp_<module name>.ver
else
mv -f .tmp_<module name>.o <module name>.o
Step 3.
LINUXDIR/scripts/mod/modpost .............. vmlinux
<module name>.o
#the above command create file <module name>.mod.c
Step 4.
gcc ....................... - o <module name>.mod.o
<module name>.mod.c
Step 5.
ld -m elf_i386 -r -o <module name>.ko <module name>.o
<module name>.mod.o
In step 2 it is checking for
__ksymtab on .tmp_<module name>.o header.
Can anybody tell me when __ksymtab in included in
module object header.
Is it only added when we have EXPORT_SYMBOL Macro in
kernel module code or any other reason.
And what is .tmp_<module name>.ver file.
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