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authorAl Viro <viro@zeniv.linux.org.uk>2012-10-26 19:59:16 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-11-28 22:36:46 -0500
commit415bfae9e9dbc2232f1797a3ac78a22049a75e06 (patch)
treed5cd2e445270a1ffc6f1f5a860d458cbf321066b /arch/parisc/kernel/process.c
parent92bbe6cdfdeeaf9ac2a240b1829bab219e7e91d0 (diff)
parisc: switch to generic fork/vfork/clone
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/parisc/kernel/process.c')
-rw-r--r--arch/parisc/kernel/process.c49
1 files changed, 10 insertions, 39 deletions
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index 38db36f64307..9753ecf49a06 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -202,46 +202,10 @@ int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r)
return 1;
}
-/* Note that "fork()" is implemented in terms of clone, with
- parameters (SIGCHLD, regs->gr[30], regs). */
-int
-sys_clone(unsigned long clone_flags, unsigned long usp,
- struct pt_regs *regs)
-{
- /* 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 *parent_tidptr = (int __user *)regs->gr[24];
- int __user *child_tidptr = (int __user *)regs->gr[22];
-
- /* usp must be word aligned. This also prevents users from
- * passing in the value 1 (which is the signal for a special
- * return for a kernel thread) */
- usp = ALIGN(usp, 4);
-
- /* A zero value for usp means use the current stack */
- if (usp == 0)
- usp = regs->gr[30];
-
- return do_fork(clone_flags, usp, regs, 0, parent_tidptr, child_tidptr);
-}
-
-int
-sys_vfork(struct pt_regs *regs)
-{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gr[30], regs, 0, NULL, NULL);
-}
-
int
copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long arg,
- struct task_struct *p, struct pt_regs *pregs)
+ struct task_struct *p, struct pt_regs *unused)
{
struct pt_regs * cregs = &(p->thread.regs);
void *stack = task_stack_page(p);
@@ -278,7 +242,14 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
cregs->gr[25] = arg;
} else {
/* user thread */
- cregs->gr[30] = usp;
+ /* usp must be word aligned. This also prevents users from
+ * passing in the value 1 (which is the signal for a special
+ * return for a kernel thread) */
+ if (usp) {
+ usp = ALIGN(usp, 4);
+ if (likely(usp))
+ cregs->gr[30] = usp;
+ }
cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
if (personality(p->personality) == PER_HPUX) {
#ifdef CONFIG_HPUX
@@ -291,7 +262,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
}
/* Setup thread TLS area from the 4th parameter in clone */
if (clone_flags & CLONE_SETTLS)
- cregs->cr27 = pregs->gr[23];
+ cregs->cr27 = cregs->gr[23];
}
return 0;