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-rw-r--r--arch/alpha/kernel/process.c62
1 files changed, 14 insertions, 48 deletions
diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index 51987dcf79b8..b5d0d0923699 100644
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -235,51 +235,28 @@ release_thread(struct task_struct *dead_task)
}
/*
- * "alpha_clone()".. By the time we get here, the
- * non-volatile registers have also been saved on the
- * stack. We do some ugly pointer stuff here.. (see
- * also copy_thread)
- *
- * Notice that "fork()" is implemented in terms of clone,
- * with parameters (SIGCHLD, 0).
- */
-int
-alpha_clone(unsigned long clone_flags, unsigned long usp,
- int __user *parent_tid, int __user *child_tid,
- unsigned long tls_value, struct pt_regs *regs)
-{
- if (!usp)
- usp = rdusp();
-
- return do_fork(clone_flags, usp, regs, 0, parent_tid, child_tid);
-}
-
-int
-alpha_vfork(struct pt_regs *regs)
-{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(),
- regs, 0, NULL, NULL);
-}
-
-/*
* Copy an alpha thread..
*/
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)
{
extern void ret_from_fork(void);
extern void ret_from_kernel_thread(void);
struct thread_info *childti = task_thread_info(p);
struct pt_regs *childregs = task_pt_regs(p);
+ struct pt_regs *regs = current_pt_regs();
struct switch_stack *childstack, *stack;
unsigned long settls;
childstack = ((struct switch_stack *) childregs) - 1;
- if (unlikely(!regs)) {
+ childti->pcb.ksp = (unsigned long) childstack;
+ childti->pcb.flags = 1; /* set FEN, clear everything else */
+
+ if (unlikely(p->flags & PF_KTHREAD)) {
/* kernel thread */
memset(childstack, 0,
sizeof(struct switch_stack) + sizeof(struct pt_regs));
@@ -288,12 +265,17 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
childstack->r10 = arg;
childregs->hae = alpha_mv.hae_cache,
childti->pcb.usp = 0;
- childti->pcb.ksp = (unsigned long) childstack;
- childti->pcb.flags = 1; /* set FEN, clear everything else */
return 0;
}
+ /* Note: if CLONE_SETTLS is not set, then we must inherit the
+ value from the parent, which will have been set by the block
+ copy in dup_task_struct. This is non-intuitive, but is
+ required for proper operation in the case of a threaded
+ application calling fork. */
+ if (clone_flags & CLONE_SETTLS)
+ childti->pcb.unique = regs->r20;
+ childti->pcb.usp = usp ?: rdusp();
*childregs = *regs;
- settls = regs->r20;
childregs->r0 = 0;
childregs->r19 = 0;
childregs->r20 = 1; /* OSF/1 has some strange fork() semantics. */
@@ -301,22 +283,6 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
stack = ((struct switch_stack *) regs) - 1;
*childstack = *stack;
childstack->r26 = (unsigned long) ret_from_fork;
- childti->pcb.usp = usp;
- childti->pcb.ksp = (unsigned long) childstack;
- childti->pcb.flags = 1; /* set FEN, clear everything else */
-
- /* Set a new TLS for the child thread? Peek back into the
- syscall arguments that we saved on syscall entry. Oops,
- except we'd have clobbered it with the parent/child set
- of r20. Read the saved copy. */
- /* Note: if CLONE_SETTLS is not set, then we must inherit the
- value from the parent, which will have been set by the block
- copy in dup_task_struct. This is non-intuitive, but is
- required for proper operation in the case of a threaded
- application calling fork. */
- if (clone_flags & CLONE_SETTLS)
- childti->pcb.unique = settls;
-
return 0;
}