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
  19 asmlinkage long sys_uname64(struct new_utsname __user * name)
  20 {
  21         int err;
  22         down_read(&uts_sem);
  23         err = copy_to_user(name, &system_utsname, sizeof (*name));
  24         up_read(&uts_sem);
  25         if (personality(current->personality) == PER_LINUX32)
  26                 err |= copy_to_user(&name->machine, "i686", 5);
  27         return err ? -EFAULT : 0;
  28 }
  29
  30 #ifdef CONFIG_MODE_TT
  31 extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
  32
  33 long sys_modify_ldt_tt(int func, void *ptr, unsigned long bytecount)
  34 {
  35         /* XXX This should check VERIFY_WRITE depending on func, check this
  36          * in i386 as well.
  37          */
  38         if (!access_ok(VERIFY_READ, ptr, bytecount))
  39                 return -EFAULT;
  40         return(modify_ldt(func, ptr, bytecount));
  41 }
  42 #endif
  43
  44 #ifdef CONFIG_MODE_SKAS
  45 extern int userspace_pid[];
  46
  47 #include "skas_ptrace.h"
  48
  49 long sys_modify_ldt_skas(int func, void *ptr, unsigned long bytecount)
  50 {
  51         struct ptrace_ldt ldt;
  52         void *buf;
  53         int res, n;
  54
  55         buf = kmalloc(bytecount, GFP_KERNEL);
  56         if(buf == NULL)
  57                 return(-ENOMEM);
  58
  59         res = 0;
  60
  61         switch(func){
  62         case 1:
  63         case 0x11:
  64                 res = copy_from_user(buf, ptr, bytecount);
  65                 break;
  66         }
  67
  68         if(res != 0){
  69                 res = -EFAULT;
  70                 goto out;
  71         }
  72
  73         ldt = ((struct ptrace_ldt) { .func      = func,
  74                                      .ptr       = buf,
  75                                      .bytecount = bytecount });
  76 #warning Need to look up userspace_pid by cpu
  77         res = ptrace(PTRACE_LDT, userspace_pid[0], 0, (unsigned long) &ldt);
  78         if(res < 0)
  79                 goto out;
  80
  81         switch(func){
  82         case 0:
  83         case 2:
  84                 n = res;
  85                 res = copy_to_user(ptr, buf, n);
  86                 if(res != 0)
  87                         res = -EFAULT;
  88                 else
  89                         res = n;
  90                 break;
  91         }
  92
  93  out:
  94         kfree(buf);
  95         return(res);
  96 }
  97 #endif
  98
  99 long sys_modify_ldt(int func, void *ptr, unsigned long bytecount)
 100 {
 101         return(CHOOSE_MODE_PROC(sys_modify_ldt_tt, sys_modify_ldt_skas, func,
 102                                 ptr, bytecount));
 103 }
 104
 105 #ifdef CONFIG_MODE_TT
 106 extern long arch_prctl(int code, unsigned long addr);
 107
 108 static long arch_prctl_tt(int code, unsigned long addr)
 109 {
 110         unsigned long tmp;
 111         long ret;
 112
 113         switch(code){
 114         case ARCH_SET_GS:
 115         case ARCH_SET_FS:
 116                 ret = arch_prctl(code, addr);
 117                 break;
 118         case ARCH_GET_FS:
 119         case ARCH_GET_GS:
 120                 ret = arch_prctl(code, (unsigned long) &tmp);
 121                 if(!ret)
 122                         ret = put_user(tmp, &addr);
 123                 break;
 124         default:
 125                 ret = -EINVAL;
 126                 break;
 127         }
 128
 129         return(ret);
 130 }
 131 #endif
 132
 133 #ifdef CONFIG_MODE_SKAS
 134
 135 static long arch_prctl_skas(int code, unsigned long addr)
 136 {
 137         long ret = 0;
 138
 139         switch(code){
 140         case ARCH_SET_GS:
 141                 current->thread.regs.regs.skas.regs[GS_BASE / sizeof(unsigned long)] = addr;
 142                 break;
 143         case ARCH_SET_FS:
 144                 current->thread.regs.regs.skas.regs[FS_BASE / sizeof(unsigned long)] = addr;
 145                 break;
 146         case ARCH_GET_FS:
 147                 ret = put_user(current->thread.regs.regs.skas.regs[GS / sizeof(unsigned long)], &addr);
 148                 break;
 149         case ARCH_GET_GS:
 150                 ret = put_user(current->thread.regs.regs.skas.regs[FS / sizeof(unsigned \
 151 long)], &addr);
 152                 break;
 153         default:
 154                 ret = -EINVAL;
 155                 break;
 156         }
 157
 158         return(ret);
 159 }
 160 #endif
 161
 162 long sys_arch_prctl(int code, unsigned long addr)
 163 {
 164         return(CHOOSE_MODE_PROC(arch_prctl_tt, arch_prctl_skas, code, addr));
 165 }
 166
 167 long sys_clone(unsigned long clone_flags, unsigned long newsp,
 168                void __user *parent_tid, void __user *child_tid)
 169 {
 170         long ret;
 171
 172         /* XXX: normal arch do here this pass, and also pass the regs to
 173          * do_fork, instead of NULL. Currently the arch-independent code
 174          * ignores these values, while the UML code (actually it's
 175          * copy_thread) does the right thing. But this should change,
 176          probably. */
 177         /*if (!newsp)
 178                 newsp = UPT_SP(current->thread.regs);*/
 179         current->thread.forking = 1;
 180         ret = do_fork(clone_flags, newsp, NULL, 0, parent_tid, child_tid);
 181         current->thread.forking = 0;
 182         return(ret);
 183 }
 184
 185 /*
 186  * Overrides for Emacs so that we follow Linus's tabbing style.
 187  * Emacs will notice this stuff at the end of the file and automatically
 188  * adjust the settings for this buffer only.  This must remain at the end
 189  * of the file.
 190  * ---------------------------------------------------------------------------
 191  * Local variables:
 192  * c-file-style: "linux"
 193  * End:
 194  */