LXR linux/arch/um/sys-x86_64/syscall

   1/*
   2 * System call table for UML/x86-64, copied from arch/x86_64/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 <kern_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 * On x86-64 sys_uname is actually sys_newuname plus a compatibility trick.
  31 * See arch/x86_64/kernel/sys_x86_64.c
  32 */
  33#define sys_uname sys_uname64
  34
  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
  42
  43#define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ;
  44#undef _ASM_X86_UNISTD_64_H
  45#include "../../x86/include/asm/unistd_64.h"
  46
  47#undef __SYSCALL
  48#define __SYSCALL(nr, sym) [ nr ] = sym,
  49#undef _ASM_X86_UNISTD_64_H
  50
  51typedef void (*sys_call_ptr_t)(void);
  52
  53extern void sys_ni_syscall(void);
  54
  55/*
  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
  59 * removed.
  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.
  64 */
  65
  66sys_call_ptr_t sys_call_table[] __cacheline_aligned = {
  67#include "../../x86/include/asm/unistd_64.h"
  68};
  69
  70int syscall_table_size = sizeof(sys_call_table);
  71