arch/um/sys-x86_64/syscalls.c

   1 /*
   2  * Copyright 2003 PathScale, Inc.
   3  *
   4  * Licensed under the GPL
   5  */
   6
   7 #include "linux/linkage.h"
   8 #include "linux/slab.h"
   9 #include "linux/shm.h"
  10 #include "linux/utsname.h"
  11 #include "linux/personality.h"
  12 #include "linux/vs_cvirt.h"
  13 #include "asm/uaccess.h"
  14 #define __FRAME_OFFSETS
  15 #include "asm/ptrace.h"
  16 #include "asm/unistd.h"
  17 #include "asm/prctl.h" /* XXX This should get the constants from libc */
  18 #include "choose-mode.h"
  19 #include "kern.h"
  20
  21 asmlinkage long sys_uname64(struct new_utsname __user * name)
  22 {
  23         int err;
  24         down_read(&uts_sem);
  25         err = copy_to_user(name, vx_new_utsname(), sizeof (*name));
  26         up_read(&uts_sem);
  27         if (personality(current->personality) == PER_LINUX32)
  28                 err |= copy_to_user(&name->machine, "i686", 5);
  29         return err ? -EFAULT : 0;
  30 }
  31
  32 #ifdef CONFIG_MODE_TT
  33 extern long arch_prctl(int code, unsigned long addr);
  34
  35 static long arch_prctl_tt(int code, unsigned long addr)
  36 {
  37         unsigned long tmp;
  38         long ret;
  39
  40         switch(code){
  41         case ARCH_SET_GS:
  42         case ARCH_SET_FS:
  43                 ret = arch_prctl(code, addr);
  44                 break;
  45         case ARCH_GET_FS:
  46         case ARCH_GET_GS:
  47                 ret = arch_prctl(code, (unsigned long) &tmp);
  48                 if(!ret)
  49                         ret = put_user(tmp, (long __user *)addr);
  50                 break;
  51         default:
  52                 ret = -EINVAL;
  53                 break;
  54         }
  55
  56         return(ret);
  57 }
  58 #endif
  59
  60 #ifdef CONFIG_MODE_SKAS
  61
  62 /* XXX: Must also call arch_prctl in the host, beside saving the segment bases! */
  63 static long arch_prctl_skas(int code, unsigned long addr)
  64 {
  65         long ret = 0;
  66
  67         switch(code){
  68         case ARCH_SET_FS:
  69                 current->thread.regs.regs.skas.regs[FS_BASE / sizeof(unsigned long)] = addr;
  70                 break;
  71         case ARCH_SET_GS:
  72                 current->thread.regs.regs.skas.regs[GS_BASE / sizeof(unsigned long)] = addr;
  73                 break;
  74         case ARCH_GET_FS:
  75                 ret = put_user(current->thread.regs.regs.skas.
  76                                 regs[FS_BASE / sizeof(unsigned long)],
  77                                 (unsigned long __user *)addr);
  78                 break;
  79         case ARCH_GET_GS:
  80                 ret = put_user(current->thread.regs.regs.skas.
  81                                 regs[GS_BASE / sizeof(unsigned long)],
  82                                 (unsigned long __user *)addr);
  83                 break;
  84         default:
  85                 ret = -EINVAL;
  86                 break;
  87         }
  88
  89         return(ret);
  90 }
  91 #endif
  92
  93 long sys_arch_prctl(int code, unsigned long addr)
  94 {
  95         return(CHOOSE_MODE_PROC(arch_prctl_tt, arch_prctl_skas, code, addr));
  96 }
  97
  98 long sys_clone(unsigned long clone_flags, unsigned long newsp,
  99                void __user *parent_tid, void __user *child_tid)
 100 {
 101         long ret;
 102
 103         if (!newsp)
 104                 newsp = UPT_SP(&current->thread.regs.regs);
 105         current->thread.forking = 1;
 106         ret = do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
 107                       child_tid);
 108         current->thread.forking = 0;
 109         return(ret);
 110 }