2 * System call table for UML/x86-64, copied from arch/x86_64/kernel/syscall.c
3 * with some changes for UML.
6 #include <linux/linkage.h>
8 #include <linux/cache.h>
9 #include <kern_constants.h>
14 * Below you can see, in terms of #define's, the differences between the x86-64
15 * and the UML syscall table.
18 /* Not going to be implemented by UML, since we have no hardware. */
19 #define stub_iopl sys_ni_syscall
20 #define sys_ioperm sys_ni_syscall
23 * The UML TLS problem. Note that x86_64 does not implement this, so the below
24 * is needed only for the ia32 compatibility.
27 /* On UML we call it this way ("old" means it's not mmap2) */
28 #define sys_mmap old_mmap
30 * On x86-64 sys_uname is actually sys_newuname plus a compatibility trick.
31 * See arch/x86_64/kernel/sys_x86_64.c
33 #define sys_uname sys_uname64
35 #define stub_clone sys_clone
36 #define stub_fork sys_fork
37 #define stub_vfork sys_vfork
38 #define stub_execve sys_execve
39 #define stub_rt_sigsuspend sys_rt_sigsuspend
40 #define stub_sigaltstack sys_sigaltstack
41 #define stub_rt_sigreturn sys_rt_sigreturn
43 #define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ;
44 #undef ASM_X86__UNISTD_64_H
45 #include <asm-x86/unistd_64.h>
48 #define __SYSCALL(nr, sym) [ nr ] = sym,
49 #undef ASM_X86__UNISTD_64_H
51 typedef void (*sys_call_ptr_t)(void);
53 extern void sys_ni_syscall(void);
56 * We used to have a trick here which made sure that holes in the
57 * x86_64 table were filled in with sys_ni_syscall, but a comment in
58 * unistd_64.h says that holes aren't allowed, so the trick was
60 * The trick looked like this
61 * [0 ... UM_NR_syscall_max] = &sys_ni_syscall
62 * before including unistd_64.h - the later initializations overwrote
63 * the sys_ni_syscall filler.
66 sys_call_ptr_t sys_call_table[] __cacheline_aligned = {
67 #include <asm-x86/unistd_64.h>
70 int syscall_table_size = sizeof(sys_call_table);