[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>
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index 46b7593..7fdca87 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -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 @@
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 @@
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 @@
} 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;
