sparc,sparc64: unify kernel/

o Move all files from sparc64/kernel/ to sparc/kernel
  - rename as appropriate
o Update sparc/Makefile to the changes
o Update sparc/kernel/Makefile to include the sparc64 files

NOTE: This commit changes link order on sparc64!

Link order had to change for either of sparc32 and sparc64.
And assuming sparc64 see more testing than sparc32 change link
order on sparc64 where issues will be caught faster.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 812 insertions, 0 deletions

diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
new file mode 100644
index 00000000000..d5e2acef987
--- /dev/null
+++ b/arch/sparc/kernel/process_64.c
@@ -0,0 +1,812 @@
+/*  arch/sparc64/kernel/process.c
+ *
+ *  Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net)
+ *  Copyright (C) 1996       Eddie C. Dost   (ecd@skynet.be)
+ *  Copyright (C) 1997, 1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#include <stdarg.h>
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/delay.h>
+#include <linux/compat.h>
+#include <linux/tick.h>
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <linux/elfcore.h>
+#include <linux/sysrq.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/pstate.h>
+#include <asm/elf.h>
+#include <asm/fpumacro.h>
+#include <asm/head.h>
+#include <asm/cpudata.h>
+#include <asm/mmu_context.h>
+#include <asm/unistd.h>
+#include <asm/hypervisor.h>
+#include <asm/syscalls.h>
+#include <asm/irq_regs.h>
+#include <asm/smp.h>
+
+#include "kstack.h"
+
+static void sparc64_yield(int cpu)
+{
+	if (tlb_type != hypervisor)
+		return;
+
+	clear_thread_flag(TIF_POLLING_NRFLAG);
+	smp_mb__after_clear_bit();
+
+	while (!need_resched() && !cpu_is_offline(cpu)) {
+		unsigned long pstate;
+
+		/* Disable interrupts. */
+		__asm__ __volatile__(
+			"rdpr %%pstate, %0\n\t"
+			"andn %0, %1, %0\n\t"
+			"wrpr %0, %%g0, %%pstate"
+			: "=&r" (pstate)
+			: "i" (PSTATE_IE));
+
+		if (!need_resched() && !cpu_is_offline(cpu))
+			sun4v_cpu_yield();
+
+		/* Re-enable interrupts. */
+		__asm__ __volatile__(
+			"rdpr %%pstate, %0\n\t"
+			"or %0, %1, %0\n\t"
+			"wrpr %0, %%g0, %%pstate"
+			: "=&r" (pstate)
+			: "i" (PSTATE_IE));
+	}
+
+	set_thread_flag(TIF_POLLING_NRFLAG);
+}
+
+/* The idle loop on sparc64. */
+void cpu_idle(void)
+{
+	int cpu = smp_processor_id();
+
+	set_thread_flag(TIF_POLLING_NRFLAG);
+
+	while(1) {
+		tick_nohz_stop_sched_tick(1);
+
+		while (!need_resched() && !cpu_is_offline(cpu))
+			sparc64_yield(cpu);
+
+		tick_nohz_restart_sched_tick();
+
+		preempt_enable_no_resched();
+
+#ifdef CONFIG_HOTPLUG_CPU
+		if (cpu_is_offline(cpu))
+			cpu_play_dead();
+#endif
+
+		schedule();
+		preempt_disable();
+	}
+}
+
+#ifdef CONFIG_COMPAT
+static void show_regwindow32(struct pt_regs *regs)
+{
+	struct reg_window32 __user *rw;
+	struct reg_window32 r_w;
+	mm_segment_t old_fs;
+	
+	__asm__ __volatile__ ("flushw");
+	rw = compat_ptr((unsigned)regs->u_regs[14]);
+	old_fs = get_fs();
+	set_fs (USER_DS);
+	if (copy_from_user (&r_w, rw, sizeof(r_w))) {
+		set_fs (old_fs);
+		return;
+	}
+
+	set_fs (old_fs);			
+	printk("l0: %08x l1: %08x l2: %08x l3: %08x "
+	       "l4: %08x l5: %08x l6: %08x l7: %08x\n",
+	       r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
+	       r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
+	printk("i0: %08x i1: %08x i2: %08x i3: %08x "
+	       "i4: %08x i5: %08x i6: %08x i7: %08x\n",
+	       r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
+	       r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
+}
+#else
+#define show_regwindow32(regs)	do { } while (0)
+#endif
+
+static void show_regwindow(struct pt_regs *regs)
+{
+	struct reg_window __user *rw;
+	struct reg_window *rwk;
+	struct reg_window r_w;
+	mm_segment_t old_fs;
+
+	if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
+		__asm__ __volatile__ ("flushw");
+		rw = (struct reg_window __user *)
+			(regs->u_regs[14] + STACK_BIAS);
+		rwk = (struct reg_window *)
+			(regs->u_regs[14] + STACK_BIAS);
+		if (!(regs->tstate & TSTATE_PRIV)) {
+			old_fs = get_fs();
+			set_fs (USER_DS);
+			if (copy_from_user (&r_w, rw, sizeof(r_w))) {
+				set_fs (old_fs);
+				return;
+			}
+			rwk = &r_w;
+			set_fs (old_fs);			
+		}
+	} else {
+		show_regwindow32(regs);
+		return;
+	}
+	printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
+	       rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
+	printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
+	       rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
+	printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
+	       rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
+	printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
+	       rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
+	if (regs->tstate & TSTATE_PRIV)
+		printk("I7: <%pS>\n", (void *) rwk->ins[7]);
+}
+
+void show_regs(struct pt_regs *regs)
+{
+	printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x    %s\n", regs->tstate,
+	       regs->tpc, regs->tnpc, regs->y, print_tainted());
+	printk("TPC: <%pS>\n", (void *) regs->tpc);
+	printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
+	       regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
+	       regs->u_regs[3]);
+	printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
+	       regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
+	       regs->u_regs[7]);
+	printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
+	       regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
+	       regs->u_regs[11]);
+	printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
+	       regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
+	       regs->u_regs[15]);
+	printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
+	show_regwindow(regs);
+}
+
+struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
+static DEFINE_SPINLOCK(global_reg_snapshot_lock);
+
+static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
+			      int this_cpu)
+{
+	flushw_all();
+
+	global_reg_snapshot[this_cpu].tstate = regs->tstate;
+	global_reg_snapshot[this_cpu].tpc = regs->tpc;
+	global_reg_snapshot[this_cpu].tnpc = regs->tnpc;
+	global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
+
+	if (regs->tstate & TSTATE_PRIV) {
+		struct reg_window *rw;
+
+		rw = (struct reg_window *)
+			(regs->u_regs[UREG_FP] + STACK_BIAS);
+		if (kstack_valid(tp, (unsigned long) rw)) {
+			global_reg_snapshot[this_cpu].i7 = rw->ins[7];
+			rw = (struct reg_window *)
+				(rw->ins[6] + STACK_BIAS);
+			if (kstack_valid(tp, (unsigned long) rw))
+				global_reg_snapshot[this_cpu].rpc = rw->ins[7];
+		}
+	} else {
+		global_reg_snapshot[this_cpu].i7 = 0;
+		global_reg_snapshot[this_cpu].rpc = 0;
+	}
+	global_reg_snapshot[this_cpu].thread = tp;
+}
+
+/* In order to avoid hangs we do not try to synchronize with the
+ * global register dump client cpus.  The last store they make is to
+ * the thread pointer, so do a short poll waiting for that to become
+ * non-NULL.
+ */
+static void __global_reg_poll(struct global_reg_snapshot *gp)
+{
+	int limit = 0;
+
+	while (!gp->thread && ++limit < 100) {
+		barrier();
+		udelay(1);
+	}
+}
+
+void __trigger_all_cpu_backtrace(void)
+{
+	struct thread_info *tp = current_thread_info();
+	struct pt_regs *regs = get_irq_regs();
+	unsigned long flags;
+	int this_cpu, cpu;
+
+	if (!regs)
+		regs = tp->kregs;
+
+	spin_lock_irqsave(&global_reg_snapshot_lock, flags);
+
+	memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
+
+	this_cpu = raw_smp_processor_id();
+
+	__global_reg_self(tp, regs, this_cpu);
+
+	smp_fetch_global_regs();
+
+	for_each_online_cpu(cpu) {
+		struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
+
+		__global_reg_poll(gp);
+
+		tp = gp->thread;
+		printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
+		       (cpu == this_cpu ? '*' : ' '), cpu,
+		       gp->tstate, gp->tpc, gp->tnpc,
+		       ((tp && tp->task) ? tp->task->comm : "NULL"),
+		       ((tp && tp->task) ? tp->task->pid : -1));
+
+		if (gp->tstate & TSTATE_PRIV) {
+			printk("             TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
+			       (void *) gp->tpc,
+			       (void *) gp->o7,
+			       (void *) gp->i7,
+			       (void *) gp->rpc);
+		} else {
+			printk("             TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
+			       gp->tpc, gp->o7, gp->i7, gp->rpc);
+		}
+	}
+
+	memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
+
+	spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
+}
+
+#ifdef CONFIG_MAGIC_SYSRQ
+
+static void sysrq_handle_globreg(int key, struct tty_struct *tty)
+{
+	__trigger_all_cpu_backtrace();
+}
+
+static struct sysrq_key_op sparc_globalreg_op = {
+	.handler	= sysrq_handle_globreg,
+	.help_msg	= "Globalregs",
+	.action_msg	= "Show Global CPU Regs",
+};
+
+static int __init sparc_globreg_init(void)
+{
+	return register_sysrq_key('y', &sparc_globalreg_op);
+}
+
+core_initcall(sparc_globreg_init);
+
+#endif
+
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+	struct thread_info *ti = task_thread_info(tsk);
+	unsigned long ret = 0xdeadbeefUL;
+	
+	if (ti && ti->ksp) {
+		unsigned long *sp;
+		sp = (unsigned long *)(ti->ksp + STACK_BIAS);
+		if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
+		    sp[14]) {
+			unsigned long *fp;
+			fp = (unsigned long *)(sp[14] + STACK_BIAS);
+			if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
+				ret = fp[15];
+		}
+	}
+	return ret;
+}
+
+/* Free current thread data structures etc.. */
+void exit_thread(void)
+{
+	struct thread_info *t = current_thread_info();
+
+	if (t->utraps) {
+		if (t->utraps[0] < 2)
+			kfree (t->utraps);
+		else
+			t->utraps[0]--;
+	}
+
+	if (test_and_clear_thread_flag(TIF_PERFCTR)) {
+		t->user_cntd0 = t->user_cntd1 = NULL;
+		t->pcr_reg = 0;
+		write_pcr(0);
+	}
+}
+
+void flush_thread(void)
+{
+	struct thread_info *t = current_thread_info();
+	struct mm_struct *mm;
+
+	if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
+		clear_ti_thread_flag(t, TIF_ABI_PENDING);
+		if (test_ti_thread_flag(t, TIF_32BIT))
+			clear_ti_thread_flag(t, TIF_32BIT);
+		else
+			set_ti_thread_flag(t, TIF_32BIT);
+	}
+
+	mm = t->task->mm;
+	if (mm)
+		tsb_context_switch(mm);
+
+	set_thread_wsaved(0);
+
+	/* Turn off performance counters if on. */
+	if (test_and_clear_thread_flag(TIF_PERFCTR)) {
+		t->user_cntd0 = t->user_cntd1 = NULL;
+		t->pcr_reg = 0;
+		write_pcr(0);
+	}
+
+	/* Clear FPU register state. */
+	t->fpsaved[0] = 0;
+	
+	if (get_thread_current_ds() != ASI_AIUS)
+		set_fs(USER_DS);
+}
+
+/* It's a bit more tricky when 64-bit tasks are involved... */
+static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
+{
+	unsigned long fp, distance, rval;
+
+	if (!(test_thread_flag(TIF_32BIT))) {
+		csp += STACK_BIAS;
+		psp += STACK_BIAS;
+		__get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
+		fp += STACK_BIAS;
+	} else
+		__get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
+
+	/* Now 8-byte align the stack as this is mandatory in the
+	 * Sparc ABI due to how register windows work.  This hides
+	 * the restriction from thread libraries etc.  -DaveM
+	 */
+	csp &= ~7UL;
+
+	distance = fp - psp;
+	rval = (csp - distance);
+	if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
+		rval = 0;
+	else if (test_thread_flag(TIF_32BIT)) {
+		if (put_user(((u32)csp),
+			     &(((struct reg_window32 __user *)rval)->ins[6])))
+			rval = 0;
+	} else {
+		if (put_user(((u64)csp - STACK_BIAS),
+			     &(((struct reg_window __user *)rval)->ins[6])))
+			rval = 0;
+		else
+			rval = rval - STACK_BIAS;
+	}
+
+	return rval;
+}
+
+/* Standard stuff. */
+static inline void shift_window_buffer(int first_win, int last_win,
+				       struct thread_info *t)
+{
+	int i;
+
+	for (i = first_win; i < last_win; i++) {
+		t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
+		memcpy(&t->reg_window[i], &t->reg_window[i+1],
+		       sizeof(struct reg_window));
+	}
+}
+
+void synchronize_user_stack(void)
+{
+	struct thread_info *t = current_thread_info();
+	unsigned long window;
+
+	flush_user_windows();
+	if ((window = get_thread_wsaved()) != 0) {
+		int winsize = sizeof(struct reg_window);
+		int bias = 0;
+
+		if (test_thread_flag(TIF_32BIT))
+			winsize = sizeof(struct reg_window32);
+		else
+			bias = STACK_BIAS;
+
+		window -= 1;
+		do {
+			unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
+			struct reg_window *rwin = &t->reg_window[window];
+
+			if (!copy_to_user((char __user *)sp, rwin, winsize)) {
+				shift_window_buffer(window, get_thread_wsaved() - 1, t);
+				set_thread_wsaved(get_thread_wsaved() - 1);
+			}
+		} while (window--);
+	}
+}
+
+static void stack_unaligned(unsigned long sp)
+{
+	siginfo_t info;
+
+	info.si_signo = SIGBUS;
+	info.si_errno = 0;
+	info.si_code = BUS_ADRALN;
+	info.si_addr = (void __user *) sp;
+	info.si_trapno = 0;
+	force_sig_info(SIGBUS, &info, current);
+}
+
+void fault_in_user_windows(void)
+{
+	struct thread_info *t = current_thread_info();
+	unsigned long window;
+	int winsize = sizeof(struct reg_window);
+	int bias = 0;
+
+	if (test_thread_flag(TIF_32BIT))
+		winsize = sizeof(struct reg_window32);
+	else
+		bias = STACK_BIAS;
+
+	flush_user_windows();
+	window = get_thread_wsaved();
+
+	if (likely(window != 0)) {
+		window -= 1;
+		do {
+			unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
+			struct reg_window *rwin = &t->reg_window[window];
+
+			if (unlikely(sp & 0x7UL))
+				stack_unaligned(sp);
+
+			if (unlikely(copy_to_user((char __user *)sp,
+						  rwin, winsize)))
+				goto barf;
+		} while (window--);
+	}
+	set_thread_wsaved(0);
+	return;
+
+barf:
+	set_thread_wsaved(window + 1);
+	do_exit(SIGILL);
+}
+
+asmlinkage long sparc_do_fork(unsigned long clone_flags,
+			      unsigned long stack_start,
+			      struct pt_regs *regs,
+			      unsigned long stack_size)
+{
+	int __user *parent_tid_ptr, *child_tid_ptr;
+	unsigned long orig_i1 = regs->u_regs[UREG_I1];
+	long ret;
+
+#ifdef CONFIG_COMPAT
+	if (test_thread_flag(TIF_32BIT)) {
+		parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
+		child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
+	} else
+#endif
+	{
+		parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
+		child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
+	}
+
+	ret = do_fork(clone_flags, stack_start,
+		      regs, stack_size,
+		      parent_tid_ptr, child_tid_ptr);
+
+	/* If we get an error and potentially restart the system
+	 * call, we're screwed because copy_thread() clobbered
+	 * the parent's %o1.  So detect that case and restore it
+	 * here.
+	 */
+	if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
+		regs->u_regs[UREG_I1] = orig_i1;
+
+	return ret;
+}
+
+/* Copy a Sparc thread.  The fork() return value conventions
+ * under SunOS are nothing short of bletcherous:
+ * Parent -->  %o0 == childs  pid, %o1 == 0
+ * Child  -->  %o0 == parents pid, %o1 == 1
+ */
+int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
+		unsigned long unused,
+		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_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;
+
+		/* Special case, if we are spawning a kernel thread from
+		 * a userspace task (usermode helper, NFS or similar), we
+		 * must disable performance counters in the child because
+		 * the address space and protection realm are changing.
+		 */
+		if (t->flags & _TIF_PERFCTR) {
+			t->user_cntd0 = t->user_cntd1 = NULL;
+			t->pcr_reg = 0;
+			t->flags &= ~_TIF_PERFCTR;
+		}
+		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]++;
+	}
+
+	/* Set the return value for the child. */
+	t->kregs->u_regs[UREG_I0] = current->pid;
+	t->kregs->u_regs[UREG_I1] = 1;
+
+	/* Set the second return value for the parent. */
+	regs->u_regs[UREG_I1] = 0;
+
+	if (clone_flags & CLONE_SETTLS)
+		t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
+
+	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;
+}
+
+typedef struct {
+	union {
+		unsigned int	pr_regs[32];
+		unsigned long	pr_dregs[16];
+	} pr_fr;
+	unsigned int __unused;
+	unsigned int	pr_fsr;
+	unsigned char	pr_qcnt;
+	unsigned char	pr_q_entrysize;
+	unsigned char	pr_en;
+	unsigned int	pr_q[64];
+} elf_fpregset_t32;
+
+/*
+ * fill in the fpu structure for a core dump.
+ */
+int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
+{
+	unsigned long *kfpregs = current_thread_info()->fpregs;
+	unsigned long fprs = current_thread_info()->fpsaved[0];
+
+	if (test_thread_flag(TIF_32BIT)) {
+		elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
+
+		if (fprs & FPRS_DL)
+			memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
+			       sizeof(unsigned int) * 32);
+		else
+			memset(&fpregs32->pr_fr.pr_regs[0], 0,
+			       sizeof(unsigned int) * 32);
+		fpregs32->pr_qcnt = 0;
+		fpregs32->pr_q_entrysize = 8;
+		memset(&fpregs32->pr_q[0], 0,
+		       (sizeof(unsigned int) * 64));
+		if (fprs & FPRS_FEF) {
+			fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
+			fpregs32->pr_en = 1;
+		} else {
+			fpregs32->pr_fsr = 0;
+			fpregs32->pr_en = 0;
+		}
+	} else {
+		if(fprs & FPRS_DL)
+			memcpy(&fpregs->pr_regs[0], kfpregs,
+			       sizeof(unsigned int) * 32);
+		else
+			memset(&fpregs->pr_regs[0], 0,
+			       sizeof(unsigned int) * 32);
+		if(fprs & FPRS_DU)
+			memcpy(&fpregs->pr_regs[16], kfpregs+16,
+			       sizeof(unsigned int) * 32);
+		else
+			memset(&fpregs->pr_regs[16], 0,
+			       sizeof(unsigned int) * 32);
+		if(fprs & FPRS_FEF) {
+			fpregs->pr_fsr = current_thread_info()->xfsr[0];
+			fpregs->pr_gsr = current_thread_info()->gsr[0];
+		} else {
+			fpregs->pr_fsr = fpregs->pr_gsr = 0;
+		}
+		fpregs->pr_fprs = fprs;
+	}
+	return 1;
+}
+
+/*
+ * 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;
+	char *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,
+			  (char __user * __user *)
+			  regs->u_regs[base + UREG_I1],
+			  (char __user * __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;
+	struct thread_info *tp;
+	struct reg_window *rw;
+        unsigned long ret = 0;
+	int count = 0; 
+
+	if (!task || task == current ||
+            task->state == TASK_RUNNING)
+		goto out;
+
+	tp = task_thread_info(task);
+	bias = STACK_BIAS;
+	fp = task_thread_info(task)->ksp + bias;
+
+	do {
+		if (!kstack_valid(tp, fp))
+			break;
+		rw = (struct reg_window *) fp;
+		pc = rw->ins[7];
+		if (!in_sched_functions(pc)) {
+			ret = pc;
+			goto out;
+		}
+		fp = rw->ins[6] + bias;
+	} while (++count < 16);
+
+out:
+	return ret;
+}