score: switch to generic fork/vfork/clone

[sfrench/cifs-2.6.git] / arch / score / kernel / process.c

diff --git a/arch/score/kernel/process.c b/arch/score/kernel/process.c
index 637970cfd3f41454f33af2eaa3f2255541dd21b5..f96379a5aee032cdd03e0d5194148d45a9ffd6ee 100644 (file)
--- a/arch/score/kernel/process.c
+++ b/arch/score/kernel/process.c
@@ -60,6 +60,7 @@ void __noreturn cpu_idle(void)
 }
 
 void ret_from_fork(void);
+void ret_from_kernel_thread(void);
 
 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
 {
@@ -86,29 +87,27 @@ void flush_thread(void) {}
  * set up the kernel stack and exception frames for a new process
  */
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-               unsigned long unused,
+               unsigned long arg,
                struct task_struct *p, struct pt_regs *regs)
 {
        struct thread_info *ti = task_thread_info(p);
        struct pt_regs *childregs = task_pt_regs(p);
 
-       p->set_child_tid = NULL;
-       p->clear_child_tid = NULL;
-
-       *childregs = *regs;
-       childregs->regs[7] = 0;         /* Clear error flag */
-       childregs->regs[4] = 0;         /* Child gets zero as return value */
-       regs->regs[4] = p->pid;
-
-       if (childregs->cp0_psr & 0x8) { /* test kernel fork or user fork */
-               childregs->regs[0] = usp;               /* user fork */
+       p->thread.reg0 = (unsigned long) childregs;
+       if (unlikely(p->flags & PF_KTHREAD)) {
+               memset(childregs, 0, sizeof(struct pt_regs));
+               p->thread->reg12 = usp;
+               p->thread->reg13 = arg;
+               p->thread.reg3 = (unsigned long) ret_from_kernel_thread;
        } else {
-               childregs->regs[28] = (unsigned long) ti; /* kernel fork */
-               childregs->regs[0] = (unsigned long) childregs;
+               *childregs = *current_pt_regs();
+               childregs->regs[7] = 0;         /* Clear error flag */
+               childregs->regs[4] = 0;         /* Child gets zero as return value */
+               if (usp)
+                       childregs->regs[0] = usp;       /* user fork */
+               p->thread.reg3 = (unsigned long) ret_from_fork;
        }
 
-       p->thread.reg0 = (unsigned long) childregs;
-       p->thread.reg3 = (unsigned long) ret_from_fork;
        p->thread.cp0_psr = 0;
 
        return 0;
@@ -120,32 +119,6 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
        return 1;
 }
 
-static void __noreturn
-kernel_thread_helper(void *unused0, int (*fn)(void *),
-                void *arg, void *unused1)
-{
-       do_exit(fn(arg));
-}
-
-/*
- * Create a kernel thread.
- */
-long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
-       struct pt_regs regs;
-
-       memset(&regs, 0, sizeof(regs));
-
-       regs.regs[6] = (unsigned long) arg;
-       regs.regs[5] = (unsigned long) fn;
-       regs.cp0_epc = (unsigned long) kernel_thread_helper;
-       regs.cp0_psr = (regs.cp0_psr & ~(0x1|0x4|0x8)) | \
-                       ((regs.cp0_psr & 0x3) << 2);
-
-       return do_fork(flags | CLONE_VM | CLONE_UNTRACED, \
-                       0, &regs, 0, NULL, NULL);
-}
-
 unsigned long thread_saved_pc(struct task_struct *tsk)
 {
        return task_pt_regs(tsk)->cp0_epc;