1// SPDX-License-Identifier: GPL-2.0
2/*
3 * System call table for UML/x86-64, copied from arch/x86/kernel/syscall_*.c
4 * with some changes for UML.
5 */
6
7#include <linux/linkage.h>
8#include <linux/sys.h>
9#include <linux/cache.h>
10#include <asm/unistd.h>
11#include <asm/syscall.h>
12
13#define __NO_STUBS
14
15/*
16 * Below you can see, in terms of #define's, the differences between the x86-64
17 * and the UML syscall table.
18 */
19
20/* Not going to be implemented by UML, since we have no hardware. */
21#define sys_iopl sys_ni_syscall
22#define sys_ioperm sys_ni_syscall
23
24/*
25 * The UML TLS problem. Note that x86_64 does not implement this, so the below
26 * is needed only for the ia32 compatibility.
27 */
28
29/* On UML we call it this way ("old" means it's not mmap2) */
30#define sys_mmap old_mmap
31
32#define stub_clone sys_clone
33#define stub_fork sys_fork
34#define stub_vfork sys_vfork
35#define stub_execve sys_execve
36#define stub_execveat sys_execveat
37#define stub_rt_sigreturn sys_rt_sigreturn
38
39#define __SYSCALL_X32(nr, sym)
40#define __SYSCALL_COMMON(nr, sym) __SYSCALL_64(nr, sym)
41
42#define __SYSCALL_64(nr, sym) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
43#include <asm/syscalls_64.h>
44
45#undef __SYSCALL_64
46#define __SYSCALL_64(nr, sym) [ nr ] = sym,
47
48extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);
49
50const sys_call_ptr_t sys_call_table[] ____cacheline_aligned = {
51	/*
52	 * Smells like a compiler bug -- it doesn't work
53	 * when the & below is removed.
54	 */
55	[0 ... __NR_syscall_max] = &sys_ni_syscall,
56#include <asm/syscalls_64.h>
57};
58
59int syscall_table_size = sizeof(sys_call_table);
60