Hi all,
I am trying to add a new system call to android kernel, but met the
following errors during compilation:
MODPOST vmlinux.o
WARNING: modpost: Found 10 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
GEN .version
CHK include/generated/compile.h
UPD include/generated/compile.h
CC init/version.o
LD init/built-in.o
LD .tmp_vmlinux1
arch/arm/kernel/built-in.o: In function `__sys_trace_return':
/home/lwan1/WORKING_DIRECTORY/kernel/arch/arm/kernel/entry-common.S:323:
undefined reference to `sys_myservice'
arch/arm/kernel/built-in.o: In function `sys_oabi_readahead':
/home/lwan1/WORKING_DIRECTORY/kernel/arch/arm/kernel/entry-common.S:468:
undefined reference to `sys_myservice'
make[1]: *** [.tmp_vmlinux1] Error 1
make: *** [sub-make] Error 2
make: Leaving directory `/home/lwan1/WORKING_DIRECTORY/kernel'
The following is what I did:
1. Add the following line into "arch/arm/include/asm/inistd.h":
#define __NR_myservice (__NR_SYSCALL_BASE+366)
2. Add the following line into "arch/arm/kernel/call.S":
/* 366 */ CALL(sys_myservice)
3. Create "myservice.h" in folder "include/linux/":
#ifndef __LINUX_MYSERVICE_H
#define __LINUX_MYSERVICE_H
#include <linux/unistd.h>
#include <linux/linkage.h>
#include <linux/errno.h>
_syscall2(int, myservice, int, arg1, char*, arg2);
#endif
4. Create "myservice.c" in folder "ipc/":
#include <include/myservice.h>
asmlinkage int sys_myservice (int arg1, char* arg2) {
//kernel messages logged to /var/log/kernel/warning
printk(KERN_EMERG “my service is running”);
return(1);
}
5. Add the following line into makefile in folder "ipc/":
obj -y += myservice.o
May I ask what have I done wrong or miss?
Any hint would be warmly welcomed.
Thank you very much.
Yours
Sincerely
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