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 <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
  48 extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);
  49
  50 const 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
  59 int syscall_table_size = sizeof(sys_call_table);