291248fd6e
This patch removes a variable which was not used in two functions. Yet another code cleanup, nothing really significant. Please note that I could not test this on x86_64. I don't have the hardware for it. [ jdike - Bits of tidying around the affected code. Also, it's fine on x86_64 ] Signed-off-by: Karol Swietlicki <magotari@gmail.com> Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/*
|
|
* Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
* Copyright 2003 PathScale, Inc.
|
|
*
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include "linux/linkage.h"
|
|
#include "linux/personality.h"
|
|
#include "linux/utsname.h"
|
|
#include "asm/prctl.h" /* XXX This should get the constants from libc */
|
|
#include "asm/uaccess.h"
|
|
#include "os.h"
|
|
|
|
asmlinkage long sys_uname64(struct new_utsname __user * name)
|
|
{
|
|
int err;
|
|
|
|
down_read(&uts_sem);
|
|
err = copy_to_user(name, utsname(), sizeof (*name));
|
|
up_read(&uts_sem);
|
|
|
|
if (personality(current->personality) == PER_LINUX32)
|
|
err |= copy_to_user(&name->machine, "i686", 5);
|
|
|
|
return err ? -EFAULT : 0;
|
|
}
|
|
|
|
long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
|
|
{
|
|
unsigned long *ptr = addr, tmp;
|
|
long ret;
|
|
int pid = task->mm->context.id.u.pid;
|
|
|
|
/*
|
|
* With ARCH_SET_FS (and ARCH_SET_GS is treated similarly to
|
|
* be safe), we need to call arch_prctl on the host because
|
|
* setting %fs may result in something else happening (like a
|
|
* GDT or thread.fs being set instead). So, we let the host
|
|
* fiddle the registers and thread struct and restore the
|
|
* registers afterwards.
|
|
*
|
|
* So, the saved registers are stored to the process (this
|
|
* needed because a stub may have been the last thing to run),
|
|
* arch_prctl is run on the host, then the registers are read
|
|
* back.
|
|
*/
|
|
switch (code) {
|
|
case ARCH_SET_FS:
|
|
case ARCH_SET_GS:
|
|
restore_registers(pid, ¤t->thread.regs.regs);
|
|
break;
|
|
case ARCH_GET_FS:
|
|
case ARCH_GET_GS:
|
|
/*
|
|
* With these two, we read to a local pointer and
|
|
* put_user it to the userspace pointer that we were
|
|
* given. If addr isn't valid (because it hasn't been
|
|
* faulted in or is just bogus), we want put_user to
|
|
* fault it in (or return -EFAULT) instead of having
|
|
* the host return -EFAULT.
|
|
*/
|
|
ptr = &tmp;
|
|
}
|
|
|
|
ret = os_arch_prctl(pid, code, ptr);
|
|
if (ret)
|
|
return ret;
|
|
|
|
switch (code) {
|
|
case ARCH_SET_FS:
|
|
current->thread.arch.fs = (unsigned long) ptr;
|
|
save_registers(pid, ¤t->thread.regs.regs);
|
|
break;
|
|
case ARCH_SET_GS:
|
|
save_registers(pid, ¤t->thread.regs.regs);
|
|
break;
|
|
case ARCH_GET_FS:
|
|
ret = put_user(tmp, addr);
|
|
break;
|
|
case ARCH_GET_GS:
|
|
ret = put_user(tmp, addr);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
long sys_arch_prctl(int code, unsigned long addr)
|
|
{
|
|
return arch_prctl(current, code, (unsigned long __user *) addr);
|
|
}
|
|
|
|
long sys_clone(unsigned long clone_flags, unsigned long newsp,
|
|
void __user *parent_tid, void __user *child_tid)
|
|
{
|
|
long ret;
|
|
|
|
if (!newsp)
|
|
newsp = UPT_SP(¤t->thread.regs.regs);
|
|
current->thread.forking = 1;
|
|
ret = do_fork(clone_flags, newsp, ¤t->thread.regs, 0, parent_tid,
|
|
child_tid);
|
|
current->thread.forking = 0;
|
|
return ret;
|
|
}
|
|
|
|
void arch_switch_to(struct task_struct *to)
|
|
{
|
|
if ((to->thread.arch.fs == 0) || (to->mm == NULL))
|
|
return;
|
|
|
|
arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs);
|
|
}
|