2 * Copyright 2003 PathScale, Inc.
4 * Licensed under the GPL
7 #include "linux/linkage.h"
8 #include "linux/slab.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 */
20 asmlinkage long sys_uname64(struct new_utsname __user * name)
24 err = copy_to_user(name, utsname(), sizeof (*name));
26 if (personality(current->personality) == PER_LINUX32)
27 err |= copy_to_user(&name->machine, "i686", 5);
28 return err ? -EFAULT : 0;
31 long arch_prctl_skas(struct task_struct *task, int code,
32 unsigned long __user *addr)
34 unsigned long *ptr = addr, tmp;
36 int pid = task->mm->context.skas.id.u.pid;
39 * With ARCH_SET_FS (and ARCH_SET_GS is treated similarly to
40 * be safe), we need to call arch_prctl on the host because
41 * setting %fs may result in something else happening (like a
42 * GDT or thread.fs being set instead). So, we let the host
43 * fiddle the registers and thread struct and restore the
44 * registers afterwards.
46 * So, the saved registers are stored to the process (this
47 * needed because a stub may have been the last thing to run),
48 * arch_prctl is run on the host, then the registers are read
54 restore_registers(pid, ¤t->thread.regs.regs);
59 * With these two, we read to a local pointer and
60 * put_user it to the userspace pointer that we were
61 * given. If addr isn't valid (because it hasn't been
62 * faulted in or is just bogus), we want put_user to
63 * fault it in (or return -EFAULT) instead of having
64 * the host return -EFAULT.
69 ret = os_arch_prctl(pid, code, ptr);
75 current->thread.arch.fs = (unsigned long) ptr;
76 save_registers(pid, ¤t->thread.regs.regs);
79 save_registers(pid, ¤t->thread.regs.regs);
82 ret = put_user(tmp, addr);
85 ret = put_user(tmp, addr);
92 long sys_arch_prctl(int code, unsigned long addr)
94 return arch_prctl_skas(current, code, (unsigned long __user *) addr);
97 long sys_clone(unsigned long clone_flags, unsigned long newsp,
98 void __user *parent_tid, void __user *child_tid)
103 newsp = UPT_SP(¤t->thread.regs.regs);
104 current->thread.forking = 1;
105 ret = do_fork(clone_flags, newsp, ¤t->thread.regs, 0, parent_tid,
107 current->thread.forking = 0;
111 void arch_switch_to_skas(struct task_struct *from, struct task_struct *to)
113 if((to->thread.arch.fs == 0) || (to->mm == NULL))
116 arch_prctl_skas(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs);