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 int modify_ldt(int func, void *ptr, unsigned long bytecount);
  33
  34 long sys_modify_ldt_tt(int func, void *ptr, unsigned long bytecount)
  35 {
  36         /* XXX This should check VERIFY_WRITE depending on func, check this
  37          * in i386 as well.
  38          */
  39         if (!access_ok(VERIFY_READ, ptr, bytecount))
  40                 return -EFAULT;
  41         return(modify_ldt(func, ptr, bytecount));
  42 }
  43 #endif
  44
  45 #ifdef CONFIG_MODE_SKAS
  46 extern int userspace_pid[];
  47
  48 #include "skas_ptrace.h"
  49
  50 long sys_modify_ldt_skas(int func, void *ptr, unsigned long bytecount)
  51 {
  52         struct ptrace_ldt ldt;
  53         void *buf;
  54         int res, n;
  55
  56         buf = kmalloc(bytecount, GFP_KERNEL);
  57         if(buf == NULL)
  58                 return(-ENOMEM);
  59
  60         res = 0;
  61
  62         switch(func){
  63         case 1:
  64         case 0x11:
  65                 res = copy_from_user(buf, ptr, bytecount);
  66                 break;
  67         }
  68
  69         if(res != 0){
  70                 res = -EFAULT;
  71                 goto out;
  72         }
  73
  74         ldt = ((struct ptrace_ldt) { .func      = func,
  75                                      .ptr       = buf,
  76                                      .bytecount = bytecount });
  77 #warning Need to look up userspace_pid by cpu
  78         res = ptrace(PTRACE_LDT, userspace_pid[0], 0, (unsigned long) &ldt);
  79         if(res < 0)
  80                 goto out;
  81
  82         switch(func){
  83         case 0:
  84         case 2:
  85                 n = res;
  86                 res = copy_to_user(ptr, buf, n);
  87                 if(res != 0)
  88                         res = -EFAULT;
  89                 else
  90                         res = n;
  91                 break;
  92         }
  93
  94  out:
  95         kfree(buf);
  96         return(res);
  97 }
  98 #endif
  99
 100 long sys_modify_ldt(int func, void *ptr, unsigned long bytecount)
 101 {
 102         return(CHOOSE_MODE_PROC(sys_modify_ldt_tt, sys_modify_ldt_skas, func,
 103                                 ptr, bytecount));
 104 }
 105
 106 #ifdef CONFIG_MODE_TT
 107 extern long arch_prctl(int code, unsigned long addr);
 108
 109 static long arch_prctl_tt(int code, unsigned long addr)
 110 {
 111         unsigned long tmp;
 112         long ret;
 113
 114         switch(code){
 115         case ARCH_SET_GS:
 116         case ARCH_SET_FS:
 117                 ret = arch_prctl(code, addr);
 118                 break;
 119         case ARCH_GET_FS:
 120         case ARCH_GET_GS:
 121                 ret = arch_prctl(code, (unsigned long) &tmp);
 122                 if(!ret)
 123                         ret = put_user(tmp, &addr);
 124                 break;
 125         default:
 126                 ret = -EINVAL;
 127                 break;
 128         }
 129
 130         return(ret);
 131 }
 132 #endif
 133
 134 #ifdef CONFIG_MODE_SKAS
 135
 136 /* XXX: Must also call arch_prctl in the host, beside saving the segment bases! */
 137 static long arch_prctl_skas(int code, unsigned long addr)
 138 {
 139         long ret = 0;
 140
 141         switch(code){
 142         case ARCH_SET_FS:
 143                 current->thread.regs.regs.skas.regs[FS_BASE / sizeof(unsigned long)] = addr;
 144                 break;
 145         case ARCH_SET_GS:
 146                 current->thread.regs.regs.skas.regs[GS_BASE / sizeof(unsigned long)] = addr;
 147                 break;
 148         case ARCH_GET_FS:
 149                 ret = put_user(current->thread.regs.regs.skas.
 150                                 regs[FS_BASE / sizeof(unsigned long)],
 151                                 (unsigned long __user *)addr);
 152                 break;
 153         case ARCH_GET_GS:
 154                 ret = put_user(current->thread.regs.regs.skas.
 155                                 regs[GS_BASE / sizeof(unsigned long)],
 156                                 (unsigned long __user *)addr);
 157                 break;
 158         default:
 159                 ret = -EINVAL;
 160                 break;
 161         }
 162
 163         return(ret);
 164 }
 165 #endif
 166
 167 long sys_arch_prctl(int code, unsigned long addr)
 168 {
 169         return(CHOOSE_MODE_PROC(arch_prctl_tt, arch_prctl_skas, code, addr));
 170 }
 171
 172 long sys_clone(unsigned long clone_flags, unsigned long newsp,
 173                void __user *parent_tid, void __user *child_tid)
 174 {
 175         long ret;
 176
 177         if (!newsp)
 178                 newsp = UPT_SP(&current->thread.regs.regs);
 179         current->thread.forking = 1;
 180         ret = do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
 181                       child_tid);
 182         current->thread.forking = 0;
 183         return(ret);
 184 }