Where is the system call table in linux kernel?

From linux kernel 4.2, the system call table has been moved from arch/x86/syscalls/syscall_64.tbl to arch/x86/entry/syscalls/syscall_64.tbl

Here is the corresponding commit:

commit 1f57d5d85ba7f1f467173ff33f51d01a91f9aaf1 Author: Ingo Molnar <[email protected]> Date: Wed Jun 3 18:36:41 2015 +0200 x86/asm/entry: Move the arch/x86/syscalls/ definitions to arch/x86/entry/syscalls/ The build time generated syscall definitions are entry code related, move them into the arch/x86/entry/ directory. 

Create a testing folder in src root: src/linux-3.4/testing/, then put inside this folder:
- a file that contains syscall code: strcpy.c

#include <linux/linkage.h> #include <linux/kernel.h> asmlinkage long sys_strcpy(char *dest, char *src) { int i=0; while(src[i]!='\0') { dest[i]=src[i++]; } dest[i]='\0'; printk(" Done it "); return 0; } 

and the Makefile that contains just the following line:

obj-y:=strcpy.o 

Add an entry to the syscall table and the prototype of the function:
- edit the file src/linux-3.4/arch/x86/syscalls/syscall_32.tbl by adding this line to the entry 223 that is free

 223 i386 strcpy sys_strcpy 

Edit the file src/linux-3.4/include/linux/syscalls.h by adding the prototype of the function

asmlinkage long sys_strcpy(char *dest, char *src); 

Edit the main Makefile in the src root (src/linux-3.4/Makefile) by adding the testing folder created before, as follow:

core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ testing/ 

For systems where audit is enabled, a table of the syscalls may be easily retrieved with:

ausyscall --dump 

For example:

$ ausyscall --dump Using x86_64 syscall table: 0 read 1 write 2 open 3 close 4 stat 5 fstat 6 lstat 7 poll 8 lseek 9 mmap 10 mprotect ...SNIP... 

A similar question on SO where the OP seems to have solved it:

New syscall not found (linux kernel 3.0.0) where should I start looking?

The file seems to be arch/x86/kernel/syscall_table_32.c.