1 files changed, 30 insertions, 113 deletions

diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index c6e0c2910043..dff54f46728d 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -622,64 +622,55 @@ asmlinkage long sparc_do_fork(unsigned long clone_flags,
  * Child  -->  %o0 == parents pid, %o1 == 1
  */
 int copy_thread(unsigned long clone_flags, unsigned long sp,
-                unsigned long unused,
+                unsigned long arg,
                 struct task_struct *p, struct pt_regs *regs)
 {
         struct thread_info *t = task_thread_info(p);
         struct sparc_stackf *parent_sf;
         unsigned long child_stack_sz;
         char *child_trap_frame;
-        int kernel_thread;
-
-        kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0;
-        parent_sf = ((struct sparc_stackf *) regs) - 1;
 
         /* Calculate offset to stack_frame & pt_regs */
-        child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) +
-                          (kernel_thread ? STACKFRAME_SZ : 0));
+        child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
         child_trap_frame = (task_stack_page(p) +
                             (THREAD_SIZE - child_stack_sz));
-        memcpy(child_trap_frame, parent_sf, child_stack_sz);
 
-        t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) |
-                                 (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
-                (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
         t->new_child = 1;
         t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
         t->kregs = (struct pt_regs *) (child_trap_frame +
                                        sizeof(struct sparc_stackf));
         t->fpsaved[0] = 0;
 
-        if (kernel_thread) {
-                struct sparc_stackf *child_sf = (struct sparc_stackf *)
-                        (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ));
-
-                /* Zero terminate the stack backtrace.  */
-                child_sf->fp = NULL;
-                t->kregs->u_regs[UREG_FP] =
-                  ((unsigned long) child_sf) - STACK_BIAS;
+        if (unlikely(p->flags & PF_KTHREAD)) {
+                memset(child_trap_frame, 0, child_stack_sz);
+                __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = 
+                        (current_pt_regs()->tstate + 1) & TSTATE_CWP;
+                t->current_ds = ASI_P;
+                t->kregs->u_regs[UREG_G1] = sp; /* function */
+                t->kregs->u_regs[UREG_G2] = arg;
+                return 0;
+        }
 
-                t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
-                t->kregs->u_regs[UREG_G6] = (unsigned long) t;
-                t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
-        } else {
-                if (t->flags & _TIF_32BIT) {
-                        sp &= 0x00000000ffffffffUL;
-                        regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
-                }
-                t->kregs->u_regs[UREG_FP] = sp;
-                t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
-                if (sp != regs->u_regs[UREG_FP]) {
-                        unsigned long csp;
-
-                        csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
-                        if (!csp)
-                                return -EFAULT;
-                        t->kregs->u_regs[UREG_FP] = csp;
-                }
-                if (t->utraps)
-                        t->utraps[0]++;
+        parent_sf = ((struct sparc_stackf *) regs) - 1;
+        memcpy(child_trap_frame, parent_sf, child_stack_sz);
+        if (t->flags & _TIF_32BIT) {
+                sp &= 0x00000000ffffffffUL;
+                regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
         }
+        t->kregs->u_regs[UREG_FP] = sp;
+        __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = 
+                (regs->tstate + 1) & TSTATE_CWP;
+        t->current_ds = ASI_AIUS;
+        if (sp != regs->u_regs[UREG_FP]) {
+                unsigned long csp;
+
+                csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
+                if (!csp)
+                        return -EFAULT;
+                t->kregs->u_regs[UREG_FP] = csp;
+        }
+        if (t->utraps)
+                t->utraps[0]++;
 
         /* Set the return value for the child. */
         t->kregs->u_regs[UREG_I0] = current->pid;
@@ -694,45 +685,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
         return 0;
 }
 
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- * NOTE! Only a kernel-only process(ie the swapper or direct descendants
- * who haven't done an "execve()") should use this: it will work within
- * a system call from a "real" process, but the process memory space will
- * not be freed until both the parent and the child have exited.
- */
-pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
-        long retval;
-
-        /* If the parent runs before fn(arg) is called by the child,
-         * the input registers of this function can be clobbered.
-         * So we stash 'fn' and 'arg' into global registers which
-         * will not be modified by the parent.
-         */
-        __asm__ __volatile__("mov %4, %%g2\n\t"    /* Save FN into global */
-                             "mov %5, %%g3\n\t"    /* Save ARG into global */
-                             "mov %1, %%g1\n\t"    /* Clone syscall nr. */
-                             "mov %2, %%o0\n\t"    /* Clone flags. */
-                             "mov 0, %%o1\n\t"     /* usp arg == 0 */
-                             "t 0x6d\n\t"          /* Linux/Sparc clone(). */
-                             "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
-                             " mov %%o0, %0\n\t"
-                             "jmpl %%g2, %%o7\n\t"   /* Call the function. */
-                             " mov %%g3, %%o0\n\t"   /* Set arg in delay. */
-                             "mov %3, %%g1\n\t"
-                             "t 0x6d\n\t"          /* Linux/Sparc exit(). */
-                             /* Notreached by child. */
-                             "1:" :
-                             "=r" (retval) :
-                             "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
-                             "i" (__NR_exit),  "r" (fn), "r" (arg) :
-                             "g1", "g2", "g3", "o0", "o1", "memory", "cc");
-        return retval;
-}
-EXPORT_SYMBOL(kernel_thread);
-
 typedef struct {
         union {
                 unsigned int    pr_regs[32];
@@ -799,41 +751,6 @@ int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
 }
 EXPORT_SYMBOL(dump_fpu);
 
-/*
- * sparc_execve() executes a new program after the asm stub has set
- * things up for us.  This should basically do what I want it to.
- */
-asmlinkage int sparc_execve(struct pt_regs *regs)
-{
-        int error, base = 0;
-        struct filename *filename;
-
-        /* User register window flush is done by entry.S */
-
-        /* Check for indirect call. */
-        if (regs->u_regs[UREG_G1] == 0)
-                base = 1;
-
-        filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
-        error = PTR_ERR(filename);
-        if (IS_ERR(filename))
-                goto out;
-        error = do_execve(filename->name,
-                          (const char __user *const __user *)
-                          regs->u_regs[base + UREG_I1],
-                          (const char __user *const __user *)
-                          regs->u_regs[base + UREG_I2], regs);
-        putname(filename);
-        if (!error) {
-                fprs_write(0);
-                current_thread_info()->xfsr[0] = 0;
-                current_thread_info()->fpsaved[0] = 0;
-                regs->tstate &= ~TSTATE_PEF;
-        }
-out:
-        return error;
-}
-
 unsigned long get_wchan(struct task_struct *task)
 {
         unsigned long pc, fp, bias = 0;