arch/um/sys-x86_64/syscall_table.c

   1 /* System call table for UML/x86-64, copied from arch/x86_64/kernel/syscall.c
   2  * with some changes for UML. */
   3
   4 #include <linux/linkage.h>
   5 #include <linux/sys.h>
   6 #include <linux/cache.h>
   7
   8 #define __NO_STUBS
   9
  10 /* Below you can see, in terms of #define's, the differences between the x86-64
  11  * and the UML syscall table. */
  12
  13 /* Not going to be implemented by UML, since we have no hardware. */
  14 #define stub_iopl sys_ni_syscall
  15 #define sys_ioperm sys_ni_syscall
  16
  17 /* The UML TLS problem. Note that x86_64 does not implement this, so the below
  18  * is needed only for the ia32 compatibility. */
  19 /*#define sys_set_thread_area sys_ni_syscall
  20 #define sys_get_thread_area sys_ni_syscall*/
  21
  22 /* On UML we call it this way ("old" means it's not mmap2) */
  23 #define sys_mmap old_mmap
  24 /* On x86-64 sys_uname is actually sys_newuname plus a compatibility trick.
  25  * See arch/x86_64/kernel/sys_x86_64.c */
  26 #define sys_uname sys_uname64
  27
  28 #define stub_clone sys_clone
  29 #define stub_fork sys_fork
  30 #define stub_vfork sys_vfork
  31 #define stub_execve sys_execve
  32 #define stub_rt_sigsuspend sys_rt_sigsuspend
  33 #define stub_sigaltstack sys_sigaltstack
  34 #define stub_rt_sigreturn sys_rt_sigreturn
  35
  36 #define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ;
  37 #undef _ASM_X86_64_UNISTD_H_
  38 #include <asm-x86_64/unistd.h>
  39
  40 #undef __SYSCALL
  41 #define __SYSCALL(nr, sym) [ nr ] = sym,
  42 #undef _ASM_X86_64_UNISTD_H_
  43
  44 typedef void (*sys_call_ptr_t)(void);
  45
  46 extern void sys_ni_syscall(void);
  47
  48 sys_call_ptr_t sys_call_table[__NR_syscall_max+1] __cacheline_aligned = {
  49         /* Smells like a like a compiler bug -- it doesn't work when the & below is removed. */
  50         [0 ... __NR_syscall_max] = &sys_ni_syscall,
  51 #include <asm-x86_64/unistd.h>
  52 };