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