root/arch/x86/um/sys_call_table_64.c

   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 <generated/user_constants.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_64(nr, sym, qual) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
  40 #include <asm/syscalls_64.h>
  41 
  42 #undef __SYSCALL_64
  43 #define __SYSCALL_64(nr, sym, qual) [ nr ] = sym,
  44 
  45 extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);
  46 
  47 const sys_call_ptr_t sys_call_table[] ____cacheline_aligned = {
  48         /*
  49          * Smells like a compiler bug -- it doesn't work
  50          * when the & below is removed.
  51          */
  52         [0 ... __NR_syscall_max] = &sys_ni_syscall,
  53 #include <asm/syscalls_64.h>
  54 };
  55 
  56 int syscall_table_size = sizeof(sys_call_table);