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[PARISC] Implement 5 argument clone. 

* arch/parisc/kernel/process.c (sys_clone): Use 5 args, and process
  CLONE_PARENT_SETTID, CLONE_CHILD_SETTID, CLONE_CHILD_CLEARTID.
  (copy_thread): First cut at CLONE_SETTLS.

Signed-off-by: Carlos O'Donell <carlos@parisc-linux.org>

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Carlos O'Donell 2005-10-21 22:53:04 -04:00 committed by Kyle McMartin
parent 8b631342dd
commit b2450cc1b7
1 changed files with 29 additions and 5 deletions
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34
arch/parisc/kernel/process.c
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@ -9,7 +9,7 @@
* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
* Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org>
* Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com>
* Copyright (C) 2000 Richard Hirst <rhirst with parisc-lixux.org>
* Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org>
* Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org>
* Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org>
* Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
@ -245,7 +245,17 @@ int
sys_clone(unsigned long clone_flags, unsigned long usp,
struct pt_regs *regs)
{
int __user *user_tid = (int __user *)regs->gr[26];
/* Arugments from userspace are:
r26 = Clone flags.
r25 = Child stack.
r24 = parent_tidptr.
r23 = Is the TLS storage descriptor
r22 = child_tidptr
However, these last 3 args are only examined
if the proper flags are set. */
int __user *child_tidptr;
int __user *parent_tidptr;
/* usp must be word aligned. This also prevents users from
* passing in the value 1 (which is the signal for a special
@ -253,10 +263,20 @@ sys_clone(unsigned long clone_flags, unsigned long usp,
usp = ALIGN(usp, 4);
/* A zero value for usp means use the current stack */
if(usp == 0)
usp = regs->gr[30];
if (usp == 0)
usp = regs->gr[30];
return do_fork(clone_flags, usp, regs, 0, user_tid, NULL);
if (clone_flags & CLONE_PARENT_SETTID)
parent_tidptr = (int __user *)regs->gr[24];
else
parent_tidptr = NULL;
if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID))
child_tidptr = (int __user *)regs->gr[22];
else
child_tidptr = NULL;
return do_fork(clone_flags, usp, regs, 0, parent_tidptr, child_tidptr);
}
int
@ -332,6 +352,10 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
} else {
cregs->kpc = (unsigned long) &child_return;
}
/* Setup thread TLS area from the 4th parameter in clone */
if (clone_flags & CLONE_SETTLS)
cregs->cr27 = pregs->gr[23];
}
return 0;