How to add a system call in linux kernel11/27/2023 ![]() The kernel version is 3.6 of raspberrypi. The Linux kernel maintains a system call table, which is simply a set of pointers to functions that implement the system calls. i put the source of sys_defclose in arch/arm/kernel and i have modified the makefile in the same directory with the new line obj-y +=sys_defclose.o arch/arm/kernel/calls.S : where i put: CALL(sys_defclose) ![]() ![]() Processes running in user space also don't have access to the kernel space. arch/arm/include/asm/unistd.h : where i put the new raw of the syscall table: #define _NR_sys_defclose (_NR_SYSCALL_BASE+380) Table of contents User Space and Kernel Space System Calls Example Exercise Linux User-space, Kernel-space, and System Calls A module runs in kernel space, whereas applications run in user space. The first thing to consider when adding a new system call is whether one of the alternatives might be suitable instead. include/linux/syscalls.h : where i put the prototype of my syscall :(.text+0xd50): undefined reference to `sys_defclose' I have been trying to write a new system call(called sys_defclose) in the raspberry's kernel, but upon compiling i get this error: arch/arm/kernel/built-in.o: In function `_sys_trace_return':
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |