helloworld module
Flynn, Neill
Neill.Flynn at itg.com
Wed Oct 26 22:04:44 UTC 2011
Hi all,
Not strictly a redhat issue as such.....but I'm really stuck, tried to
google the issue and just got more and more confused (after 3 days going
in circles).
I need to compile a kernel with a new helloworld module.....
I have done the following...
me at linux1a:/usr/src/linux-3.0.4/kernel$ sudo vi helloworld.c
#include <linux/linkage.h>
#include <linux/kernel.h>
asmlinkage int sys_helloworld() {
printk(KERN_EMERG "hello_world!");
return 1;
}
me at linux1a:/usr/src/linux-3.0.4/kernel$ sudo vi Makefile
obj-y += helloworld.o
melinux1a:/usr/src/linux-3.0.4/arch/x86/kernel$ sudo vi
/usr/src/linux-3.0.4/arch/x86/kernel/syscall_table_32.S
.long sys_sendmmsg /* 345 */
.long sys_setns
.long sys_helloworld
me at linux1a:/usr/src/linux-3.0.4$ sudo vi
/usr/src/linux-3.0.4/arch/x86/include/asm/unistd_32.h
changed:
#define __NR_open_by_handle_at 342
#define __NR_clock_adjtime 343
#define __NR_syncfs 344
#define __NR_sendmmsg 345
#define __NR_setns 346
#ifdef __KERNEL__
#define NR_syscalls 347
to:
#define __NR_open_by_handle_at 342
#define __NR_clock_adjtime 343
#define __NR_syncfs 344
#define __NR_sendmmsg 345
#define __NR_setns 346
#define __NR_helloworld 347
#ifdef __KERNEL__
#define NR_syscalls 348
Note the two changes in the above file....
1)added: #define
__NR_helloworld 347
2) changed: #define NR_syscalls 347
to: #define NR_syscalls 348
me at linux1a:/usr/src/linux-3.0.4$ sudo vi
/usr/src/linux-3.0.4/arch/x86/include/asm/syscalls.h
changed:
/* X86_32 only */
#ifdef CONFIG_X86_32
to:
/* X86_32 only */
#ifdef CONFIG_X86_32
asmlinkage int sys_helloworld();
when I go to make the kernel, I get:
me at linux1a:/usr/src/linux-3.0.4$ date; sudo make; date
Wed Oct 26 23:35:26 IST 2011
CHK include/linux/version.h
CHK include/generated/utsrelease.h
CALL scripts/checksyscalls.sh
CHK include/generated/compile.h
VDSOSYM arch/x86/vdso/vdso32-int80-syms.lds
VDSOSYM arch/x86/vdso/vdso32-sysenter-syms.lds
VDSOSYM arch/x86/vdso/vdso32-syms.lds
LD arch/x86/vdso/built-in.o
LD arch/x86/built-in.o
LD kernel/built-in.o
CC [M] kernel/helloworld.o
kernel/helloworld.c:3:16: warning: function declaration isn't a
prototype
LD vmlinux.o
MODPOST vmlinux.o
WARNING: modpost: Found 3 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/x86/built-in.o: In function `sys_call_table':
(.rodata+0x58c): undefined reference to `sys_helloworld'
make: *** [.tmp_vmlinux1] Error 1
Wed Oct 26 23:41:07 IST 2011
As I've said, I'm stuck, if this is the wrong list, please ignore with
my apologies.
If anyone can help, thanks in advance.
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