arch/x86/um/sys_call_table_64.c

   1 /*
   2  * System call table for UML/x86-64, copied from arch/x86/kernel/syscall_*.c
   3  * with some changes for UML.
   4  */
   5
   6 #include <linux/linkage.h>
   7 #include <linux/sys.h>
   8 #include <linux/cache.h>
   9 #include <generated/user_constants.h>
  10
  11 #define __NO_STUBS
  12
  13 /*
  14  * Below you can see, in terms of #define's, the differences between the x86-64
  15  * and the UML syscall table.
  16  */
  17
  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
  21
  22 /*
  23  * The UML TLS problem. Note that x86_64 does not implement this, so the below
  24  * is needed only for the ia32 compatibility.
  25  */
  26
  27 /* On UML we call it this way ("old" means it's not mmap2) */
  28 #define sys_mmap old_mmap
  29
  30 #define stub_clone sys_clone
  31 #define stub_fork sys_fork
  32 #define stub_vfork sys_vfork
  33 #define stub_execve sys_execve
  34 #define stub_rt_sigreturn sys_rt_sigreturn
  35
  36 #define __SYSCALL_COMMON(nr, sym, compat) __SYSCALL_64(nr, sym, compat)
  37 #define __SYSCALL_X32(nr, sym, compat) /* Not supported */
  38
  39 #define __SYSCALL_64(nr, sym, compat) extern asmlinkage void sym(void) ;
  40 #include <asm/syscalls_64.h>
  41
  42 #undef __SYSCALL_64
  43 #define __SYSCALL_64(nr, sym, compat) [ nr ] = sym,
  44
  45 typedef void (*sys_call_ptr_t)(void);
  46
  47 extern void sys_ni_syscall(void);
  48
  49 const sys_call_ptr_t sys_call_table[] __cacheline_aligned = {
  50         /*
  51          * Smells like a compiler bug -- it doesn't work
  52          * when the & below is removed.
  53          */
  54         [0 ... __NR_syscall_max] = &sys_ni_syscall,
  55 #include <asm/syscalls_64.h>
  56 };
  57
  58 int syscall_table_size = sizeof(sys_call_table);