From b9763ce33fff6b37e1f2e2effb14fb25e67a68f2 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 21 Oct 2012 16:40:35 -0400
Subject: [PATCH] frv: switch to generic fork/vfork/clone
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/frv/include/asm/unistd.h | 3 +++
arch/frv/kernel/process.c | 45 ++++-------------------------------
2 files changed, 8 insertions(+), 40 deletions(-)
diff --git a/arch/frv/include/asm/unistd.h b/arch/frv/include/asm/unistd.h
index 2358634caccaa..1807d8ea8cb55 100644
--- a/arch/frv/include/asm/unistd.h
+++ b/arch/frv/include/asm/unistd.h
@@ -30,6 +30,9 @@
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_SYS_FORK
+#define __ARCH_WANT_SYS_VFORK
+#define __ARCH_WANT_SYS_CLONE
/*
* "Conditional" syscalls
diff --git a/arch/frv/kernel/process.c b/arch/frv/kernel/process.c
index 7e33215f1d8fa..0039bf77b1926 100644
--- a/arch/frv/kernel/process.c
+++ b/arch/frv/kernel/process.c
@@ -139,42 +139,12 @@ inline unsigned long user_stack(const struct pt_regs *regs)
return user_mode(regs) ? regs->sp : 0;
}
-asmlinkage int sys_fork(void)
-{
-#ifndef CONFIG_MMU
- /* fork almost works, enough to trick you into looking elsewhere:-( */
- return -EINVAL;
-#else
- return do_fork(SIGCHLD, user_stack(__frame), __frame, 0, NULL, NULL);
-#endif
-}
-
-asmlinkage int sys_vfork(void)
-{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, user_stack(__frame), __frame, 0,
- NULL, NULL);
-}
-
-/*****************************************************************************/
-/*
- * clone a process
- * - tlsptr is retrieved by copy_thread()
- */
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
- int __user *parent_tidptr, int __user *child_tidptr,
- int __user *tlsptr)
-{
- if (!newsp)
- newsp = user_stack(__frame);
- return do_fork(clone_flags, newsp, __frame, 0, parent_tidptr, child_tidptr);
-} /* end sys_clone() */
-
/*
* set up the kernel stack and exception frames for a new process
*/
int copy_thread(unsigned long clone_flags,
unsigned long usp, unsigned long arg,
- struct task_struct *p, struct pt_regs *regs)
+ struct task_struct *p, struct pt_regs *unused)
{
struct pt_regs *childregs;
@@ -182,9 +152,7 @@ int copy_thread(unsigned long clone_flags,
(task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
/* set up the userspace frame (the only place that the USP is stored) */
- *childregs = *__kernel_frame0_ptr;
-
- p->set_child_tid = p->clear_child_tid = NULL;
+ *childregs = *current_pt_regs();
p->thread.frame = childregs;
p->thread.curr = p;
@@ -193,18 +161,15 @@ int copy_thread(unsigned long clone_flags,
p->thread.lr = 0;
p->thread.frame0 = childregs;
- if (unlikely(!regs)) {
+ if (unlikely(p->flags & PF_KTHREAD)) {
childregs->gr9 = usp; /* function */
childregs->gr8 = arg;
p->thread.pc = (unsigned long) ret_from_kernel_thread;
save_user_regs(p->thread.user);
return 0;
}
-
- /* set up the userspace frame (the only place that the USP is stored) */
- *childregs = *regs;
-
- childregs->sp = usp;
+ if (usp)
+ childregs->sp = usp;
childregs->next_frame = NULL;
p->thread.pc = (unsigned long) ret_from_fork;
--
2.30.2