1 files changed, 671 insertions, 0 deletions

diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
new file mode 100644
index 000000000000..ed590ad0acdc
--- /dev/null
+++ b/arch/tile/kernel/process.c
@@ -0,0 +1,671 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/preempt.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kprobes.h>
+#include <linux/elfcore.h>
+#include <linux/tick.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/compat.h>
+#include <linux/hardirq.h>
+#include <linux/syscalls.h>
+#include <linux/kernel.h>
+#include <asm/system.h>
+#include <asm/stack.h>
+#include <asm/homecache.h>
+#include <asm/syscalls.h>
+#ifdef CONFIG_HARDWALL
+#include <asm/hardwall.h>
+#endif
+#include <arch/chip.h>
+#include <arch/abi.h>
+
+
+/*
+ * Use the (x86) "idle=poll" option to prefer low latency when leaving the
+ * idle loop over low power while in the idle loop, e.g. if we have
+ * one thread per core and we want to get threads out of futex waits fast.
+ */
+static int no_idle_nap;
+static int __init idle_setup(char *str)
+{
+        if (!str)
+                return -EINVAL;
+
+        if (!strcmp(str, "poll")) {
+                pr_info("using polling idle threads.\n");
+                no_idle_nap = 1;
+        } else if (!strcmp(str, "halt"))
+                no_idle_nap = 0;
+        else
+                return -1;
+
+        return 0;
+}
+early_param("idle", idle_setup);
+
+/*
+ * The idle thread. There's no useful work to be
+ * done, so just try to conserve power and have a
+ * low exit latency (ie sit in a loop waiting for
+ * somebody to say that they'd like to reschedule)
+ */
+void cpu_idle(void)
+{
+        int cpu = smp_processor_id();
+
+
+        current_thread_info()->status |= TS_POLLING;
+
+        if (no_idle_nap) {
+                while (1) {
+                        while (!need_resched())
+                                cpu_relax();
+                        schedule();
+                }
+        }
+
+        /* endless idle loop with no priority at all */
+        while (1) {
+                tick_nohz_stop_sched_tick(1);
+                while (!need_resched()) {
+                        if (cpu_is_offline(cpu))
+                                BUG();  /* no HOTPLUG_CPU */
+
+                        local_irq_disable();
+                        __get_cpu_var(irq_stat).idle_timestamp = jiffies;
+                        current_thread_info()->status &= ~TS_POLLING;
+                        /*
+                         * TS_POLLING-cleared state must be visible before we
+                         * test NEED_RESCHED:
+                         */
+                        smp_mb();
+
+                        if (!need_resched())
+                                _cpu_idle();
+                        else
+                                local_irq_enable();
+                        current_thread_info()->status |= TS_POLLING;
+                }
+                tick_nohz_restart_sched_tick();
+                preempt_enable_no_resched();
+                schedule();
+                preempt_disable();
+        }
+}
+
+struct thread_info *alloc_thread_info(struct task_struct *task)
+{
+        struct page *page;
+        gfp_t flags = GFP_KERNEL;
+
+#ifdef CONFIG_DEBUG_STACK_USAGE
+        flags |= __GFP_ZERO;
+#endif
+
+        page = alloc_pages(flags, THREAD_SIZE_ORDER);
+        if (!page)
+                return NULL;
+
+        return (struct thread_info *)page_address(page);
+}
+
+/*
+ * Free a thread_info node, and all of its derivative
+ * data structures.
+ */
+void free_thread_info(struct thread_info *info)
+{
+        struct single_step_state *step_state = info->step_state;
+
+#ifdef CONFIG_HARDWALL
+        /*
+         * We free a thread_info from the context of the task that has
+         * been scheduled next, so the original task is already dead.
+         * Calling deactivate here just frees up the data structures.
+         * If the task we're freeing held the last reference to a
+         * hardwall fd, it would have been released prior to this point
+         * anyway via exit_files(), and "hardwall" would be NULL by now.
+         */
+        if (info->task->thread.hardwall)
+                hardwall_deactivate(info->task);
+#endif
+
+        if (step_state) {
+
+                /*
+                 * FIXME: we don't munmap step_state->buffer
+                 * because the mm_struct for this process (info->task->mm)
+                 * has already been zeroed in exit_mm().  Keeping a
+                 * reference to it here seems like a bad move, so this
+                 * means we can't munmap() the buffer, and therefore if we
+                 * ptrace multiple threads in a process, we will slowly
+                 * leak user memory.  (Note that as soon as the last
+                 * thread in a process dies, we will reclaim all user
+                 * memory including single-step buffers in the usual way.)
+                 * We should either assign a kernel VA to this buffer
+                 * somehow, or we should associate the buffer(s) with the
+                 * mm itself so we can clean them up that way.
+                 */
+                kfree(step_state);
+        }
+
+        free_page((unsigned long)info);
+}
+
+static void save_arch_state(struct thread_struct *t);
+
+int copy_thread(unsigned long clone_flags, unsigned long sp,
+                unsigned long stack_size,
+                struct task_struct *p, struct pt_regs *regs)
+{
+        struct pt_regs *childregs;
+        unsigned long ksp;
+
+        /*
+         * When creating a new kernel thread we pass sp as zero.
+         * Assign it to a reasonable value now that we have the stack.
+         */
+        if (sp == 0 && regs->ex1 == PL_ICS_EX1(KERNEL_PL, 0))
+                sp = KSTK_TOP(p);
+
+        /*
+         * Do not clone step state from the parent; each thread
+         * must make its own lazily.
+         */
+        task_thread_info(p)->step_state = NULL;
+
+        /*
+         * Start new thread in ret_from_fork so it schedules properly
+         * and then return from interrupt like the parent.
+         */
+        p->thread.pc = (unsigned long) ret_from_fork;
+
+        /* Save user stack top pointer so we can ID the stack vm area later. */
+        p->thread.usp0 = sp;
+
+        /* Record the pid of the process that created this one. */
+        p->thread.creator_pid = current->pid;
+
+        /*
+         * Copy the registers onto the kernel stack so the
+         * return-from-interrupt code will reload it into registers.
+         */
+        childregs = task_pt_regs(p);
+        *childregs = *regs;
+        childregs->regs[0] = 0;         /* return value is zero */
+        childregs->sp = sp;  /* override with new user stack pointer */
+
+        /*
+         * Copy the callee-saved registers from the passed pt_regs struct
+         * into the context-switch callee-saved registers area.
+         * We have to restore the callee-saved registers since we may
+         * be cloning a userspace task with userspace register state,
+         * and we won't be unwinding the same kernel frames to restore them.
+         * Zero out the C ABI save area to mark the top of the stack.
+         */
+        ksp = (unsigned long) childregs;
+        ksp -= C_ABI_SAVE_AREA_SIZE;   /* interrupt-entry save area */
+        ((long *)ksp)[0] = ((long *)ksp)[1] = 0;
+        ksp -= CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long);
+        memcpy((void *)ksp, &regs->regs[CALLEE_SAVED_FIRST_REG],
+               CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long));
+        ksp -= C_ABI_SAVE_AREA_SIZE;   /* __switch_to() save area */
+        ((long *)ksp)[0] = ((long *)ksp)[1] = 0;
+        p->thread.ksp = ksp;
+
+#if CHIP_HAS_TILE_DMA()
+        /*
+         * No DMA in the new thread.  We model this on the fact that
+         * fork() clears the pending signals, alarms, and aio for the child.
+         */
+        memset(&p->thread.tile_dma_state, 0, sizeof(struct tile_dma_state));
+        memset(&p->thread.dma_async_tlb, 0, sizeof(struct async_tlb));
+#endif
+
+#if CHIP_HAS_SN_PROC()
+        /* Likewise, the new thread is not running static processor code. */
+        p->thread.sn_proc_running = 0;
+        memset(&p->thread.sn_async_tlb, 0, sizeof(struct async_tlb));
+#endif
+
+#if CHIP_HAS_PROC_STATUS_SPR()
+        /* New thread has its miscellaneous processor state bits clear. */
+        p->thread.proc_status = 0;
+#endif
+
+#ifdef CONFIG_HARDWALL
+        /* New thread does not own any networks. */
+        p->thread.hardwall = NULL;
+#endif
+
+
+        /*
+         * Start the new thread with the current architecture state
+         * (user interrupt masks, etc.).
+         */
+        save_arch_state(&p->thread);
+
+        return 0;
+}
+
+/*
+ * Return "current" if it looks plausible, or else a pointer to a dummy.
+ * This can be helpful if we are just trying to emit a clean panic.
+ */
+struct task_struct *validate_current(void)
+{
+        static struct task_struct corrupt = { .comm = "<corrupt>" };
+        struct task_struct *tsk = current;
+        if (unlikely((unsigned long)tsk < PAGE_OFFSET ||
+                     (void *)tsk > high_memory ||
+                     ((unsigned long)tsk & (__alignof__(*tsk) - 1)) != 0)) {
+                pr_err("Corrupt 'current' %p (sp %#lx)\n", tsk, stack_pointer);
+                tsk = &corrupt;
+        }
+        return tsk;
+}
+
+/* Take and return the pointer to the previous task, for schedule_tail(). */
+struct task_struct *sim_notify_fork(struct task_struct *prev)
+{
+        struct task_struct *tsk = current;
+        __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_FORK_PARENT |
+                     (tsk->thread.creator_pid << _SIM_CONTROL_OPERATOR_BITS));
+        __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_FORK |
+                     (tsk->pid << _SIM_CONTROL_OPERATOR_BITS));
+        return prev;
+}
+
+int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
+{
+        struct pt_regs *ptregs = task_pt_regs(tsk);
+        elf_core_copy_regs(regs, ptregs);
+        return 1;
+}
+
+#if CHIP_HAS_TILE_DMA()
+
+/* Allow user processes to access the DMA SPRs */
+void grant_dma_mpls(void)
+{
+        __insn_mtspr(SPR_MPL_DMA_CPL_SET_0, 1);
+        __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_0, 1);
+}
+
+/* Forbid user processes from accessing the DMA SPRs */
+void restrict_dma_mpls(void)
+{
+        __insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1);
+        __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1);
+}
+
+/* Pause the DMA engine, then save off its state registers. */
+static void save_tile_dma_state(struct tile_dma_state *dma)
+{
+        unsigned long state = __insn_mfspr(SPR_DMA_USER_STATUS);
+        unsigned long post_suspend_state;
+
+        /* If we're running, suspend the engine. */
+        if ((state & DMA_STATUS_MASK) == SPR_DMA_STATUS__RUNNING_MASK)
+                __insn_mtspr(SPR_DMA_CTR, SPR_DMA_CTR__SUSPEND_MASK);
+
+        /*
+         * Wait for the engine to idle, then save regs.  Note that we
+         * want to record the "running" bit from before suspension,
+         * and the "done" bit from after, so that we can properly
+         * distinguish a case where the user suspended the engine from
+         * the case where the kernel suspended as part of the context
+         * swap.
+         */
+        do {
+                post_suspend_state = __insn_mfspr(SPR_DMA_USER_STATUS);
+        } while (post_suspend_state & SPR_DMA_STATUS__BUSY_MASK);
+
+        dma->src = __insn_mfspr(SPR_DMA_SRC_ADDR);
+        dma->src_chunk = __insn_mfspr(SPR_DMA_SRC_CHUNK_ADDR);
+        dma->dest = __insn_mfspr(SPR_DMA_DST_ADDR);
+        dma->dest_chunk = __insn_mfspr(SPR_DMA_DST_CHUNK_ADDR);
+        dma->strides = __insn_mfspr(SPR_DMA_STRIDE);
+        dma->chunk_size = __insn_mfspr(SPR_DMA_CHUNK_SIZE);
+        dma->byte = __insn_mfspr(SPR_DMA_BYTE);
+        dma->status = (state & SPR_DMA_STATUS__RUNNING_MASK) |
+                (post_suspend_state & SPR_DMA_STATUS__DONE_MASK);
+}
+
+/* Restart a DMA that was running before we were context-switched out. */
+static void restore_tile_dma_state(struct thread_struct *t)
+{
+        const struct tile_dma_state *dma = &t->tile_dma_state;
+
+        /*
+         * The only way to restore the done bit is to run a zero
+         * length transaction.
+         */
+        if ((dma->status & SPR_DMA_STATUS__DONE_MASK) &&
+            !(__insn_mfspr(SPR_DMA_USER_STATUS) & SPR_DMA_STATUS__DONE_MASK)) {
+                __insn_mtspr(SPR_DMA_BYTE, 0);
+                __insn_mtspr(SPR_DMA_CTR, SPR_DMA_CTR__REQUEST_MASK);
+                while (__insn_mfspr(SPR_DMA_USER_STATUS) &
+                       SPR_DMA_STATUS__BUSY_MASK)
+                        ;
+        }
+
+        __insn_mtspr(SPR_DMA_SRC_ADDR, dma->src);
+        __insn_mtspr(SPR_DMA_SRC_CHUNK_ADDR, dma->src_chunk);
+        __insn_mtspr(SPR_DMA_DST_ADDR, dma->dest);
+        __insn_mtspr(SPR_DMA_DST_CHUNK_ADDR, dma->dest_chunk);
+        __insn_mtspr(SPR_DMA_STRIDE, dma->strides);
+        __insn_mtspr(SPR_DMA_CHUNK_SIZE, dma->chunk_size);
+        __insn_mtspr(SPR_DMA_BYTE, dma->byte);
+
+        /*
+         * Restart the engine if we were running and not done.
+         * Clear a pending async DMA fault that we were waiting on return
+         * to user space to execute, since we expect the DMA engine
+         * to regenerate those faults for us now.  Note that we don't
+         * try to clear the TIF_ASYNC_TLB flag, since it's relatively
+         * harmless if set, and it covers both DMA and the SN processor.
+         */
+        if ((dma->status & DMA_STATUS_MASK) == SPR_DMA_STATUS__RUNNING_MASK) {
+                t->dma_async_tlb.fault_num = 0;
+                __insn_mtspr(SPR_DMA_CTR, SPR_DMA_CTR__REQUEST_MASK);
+        }
+}
+
+#endif
+
+static void save_arch_state(struct thread_struct *t)
+{
+#if CHIP_HAS_SPLIT_INTR_MASK()
+        t->interrupt_mask = __insn_mfspr(SPR_INTERRUPT_MASK_0_0) |
+                ((u64)__insn_mfspr(SPR_INTERRUPT_MASK_0_1) << 32);
+#else
+        t->interrupt_mask = __insn_mfspr(SPR_INTERRUPT_MASK_0);
+#endif
+        t->ex_context[0] = __insn_mfspr(SPR_EX_CONTEXT_0_0);
+        t->ex_context[1] = __insn_mfspr(SPR_EX_CONTEXT_0_1);
+        t->system_save[0] = __insn_mfspr(SPR_SYSTEM_SAVE_0_0);
+        t->system_save[1] = __insn_mfspr(SPR_SYSTEM_SAVE_0_1);
+        t->system_save[2] = __insn_mfspr(SPR_SYSTEM_SAVE_0_2);
+        t->system_save[3] = __insn_mfspr(SPR_SYSTEM_SAVE_0_3);
+        t->intctrl_0 = __insn_mfspr(SPR_INTCTRL_0_STATUS);
+#if CHIP_HAS_PROC_STATUS_SPR()
+        t->proc_status = __insn_mfspr(SPR_PROC_STATUS);
+#endif
+}
+
+static void restore_arch_state(const struct thread_struct *t)
+{
+#if CHIP_HAS_SPLIT_INTR_MASK()
+        __insn_mtspr(SPR_INTERRUPT_MASK_0_0, (u32) t->interrupt_mask);
+        __insn_mtspr(SPR_INTERRUPT_MASK_0_1, t->interrupt_mask >> 32);
+#else
+        __insn_mtspr(SPR_INTERRUPT_MASK_0, t->interrupt_mask);
+#endif
+        __insn_mtspr(SPR_EX_CONTEXT_0_0, t->ex_context[0]);
+        __insn_mtspr(SPR_EX_CONTEXT_0_1, t->ex_context[1]);
+        __insn_mtspr(SPR_SYSTEM_SAVE_0_0, t->system_save[0]);
+        __insn_mtspr(SPR_SYSTEM_SAVE_0_1, t->system_save[1]);
+        __insn_mtspr(SPR_SYSTEM_SAVE_0_2, t->system_save[2]);
+        __insn_mtspr(SPR_SYSTEM_SAVE_0_3, t->system_save[3]);
+        __insn_mtspr(SPR_INTCTRL_0_STATUS, t->intctrl_0);
+#if CHIP_HAS_PROC_STATUS_SPR()
+        __insn_mtspr(SPR_PROC_STATUS, t->proc_status);
+#endif
+#if CHIP_HAS_TILE_RTF_HWM()
+        /*
+         * Clear this whenever we switch back to a process in case
+         * the previous process was monkeying with it.  Even if enabled
+         * in CBOX_MSR1 via TILE_RTF_HWM_MIN, it's still just a
+         * performance hint, so isn't worth a full save/restore.
+         */
+        __insn_mtspr(SPR_TILE_RTF_HWM, 0);
+#endif
+}
+
+
+void _prepare_arch_switch(struct task_struct *next)
+{
+#if CHIP_HAS_SN_PROC()
+        int snctl;
+#endif
+#if CHIP_HAS_TILE_DMA()
+        struct tile_dma_state *dma = &current->thread.tile_dma_state;
+        if (dma->enabled)
+                save_tile_dma_state(dma);
+#endif
+#if CHIP_HAS_SN_PROC()
+        /*
+         * Suspend the static network processor if it was running.
+         * We do not suspend the fabric itself, just like we don't
+         * try to suspend the UDN.
+         */
+        snctl = __insn_mfspr(SPR_SNCTL);
+        current->thread.sn_proc_running =
+                (snctl & SPR_SNCTL__FRZPROC_MASK) == 0;
+        if (current->thread.sn_proc_running)
+                __insn_mtspr(SPR_SNCTL, snctl | SPR_SNCTL__FRZPROC_MASK);
+#endif
+}
+
+
+struct task_struct *__sched _switch_to(struct task_struct *prev,
+                                       struct task_struct *next)
+{
+        /* DMA state is already saved; save off other arch state. */
+        save_arch_state(&prev->thread);
+
+#if CHIP_HAS_TILE_DMA()
+        /*
+         * Restore DMA in new task if desired.
+         * Note that it is only safe to restart here since interrupts
+         * are disabled, so we can't take any DMATLB miss or access
+         * interrupts before we have finished switching stacks.
+         */
+        if (next->thread.tile_dma_state.enabled) {
+                restore_tile_dma_state(&next->thread);
+                grant_dma_mpls();
+        } else {
+                restrict_dma_mpls();
+        }
+#endif
+
+        /* Restore other arch state. */
+        restore_arch_state(&next->thread);
+
+#if CHIP_HAS_SN_PROC()
+        /*
+         * Restart static network processor in the new process
+         * if it was running before.
+         */
+        if (next->thread.sn_proc_running) {
+                int snctl = __insn_mfspr(SPR_SNCTL);
+                __insn_mtspr(SPR_SNCTL, snctl & ~SPR_SNCTL__FRZPROC_MASK);
+        }
+#endif
+
+#ifdef CONFIG_HARDWALL
+        /* Enable or disable access to the network registers appropriately. */
+        if (prev->thread.hardwall != NULL) {
+                if (next->thread.hardwall == NULL)
+                        restrict_network_mpls();
+        } else if (next->thread.hardwall != NULL) {
+                grant_network_mpls();
+        }
+#endif
+
+        /*
+         * Switch kernel SP, PC, and callee-saved registers.
+         * In the context of the new task, return the old task pointer
+         * (i.e. the task that actually called __switch_to).
+         * Pass the value to use for SYSTEM_SAVE_1_0 when we reset our sp.
+         */
+        return __switch_to(prev, next, next_current_ksp0(next));
+}
+
+long _sys_fork(struct pt_regs *regs)
+{
+        return do_fork(SIGCHLD, regs->sp, regs, 0, NULL, NULL);
+}
+
+long _sys_clone(unsigned long clone_flags, unsigned long newsp,
+                void __user *parent_tidptr, void __user *child_tidptr,
+                struct pt_regs *regs)
+{
+        if (!newsp)
+                newsp = regs->sp;
+        return do_fork(clone_flags, newsp, regs, 0,
+                       parent_tidptr, child_tidptr);
+}
+
+long _sys_vfork(struct pt_regs *regs)
+{
+        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->sp,
+                       regs, 0, NULL, NULL);
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+long _sys_execve(char __user *path, char __user *__user *argv,
+                 char __user *__user *envp, struct pt_regs *regs)
+{
+        long error;
+        char *filename;
+
+        filename = getname(path);
+        error = PTR_ERR(filename);
+        if (IS_ERR(filename))
+                goto out;
+        error = do_execve(filename, argv, envp, regs);
+        putname(filename);
+out:
+        return error;
+}
+
+#ifdef CONFIG_COMPAT
+long _compat_sys_execve(char __user *path, compat_uptr_t __user *argv,
+                        compat_uptr_t __user *envp, struct pt_regs *regs)
+{
+        long error;
+        char *filename;
+
+        filename = getname(path);
+        error = PTR_ERR(filename);
+        if (IS_ERR(filename))
+                goto out;
+        error = compat_do_execve(filename, argv, envp, regs);
+        putname(filename);
+out:
+        return error;
+}
+#endif
+
+unsigned long get_wchan(struct task_struct *p)
+{
+        struct KBacktraceIterator kbt;
+
+        if (!p || p == current || p->state == TASK_RUNNING)
+                return 0;
+
+        for (KBacktraceIterator_init(&kbt, p, NULL);
+             !KBacktraceIterator_end(&kbt);
+             KBacktraceIterator_next(&kbt)) {
+                if (!in_sched_functions(kbt.it.pc))
+                        return kbt.it.pc;
+        }
+
+        return 0;
+}
+
+/*
+ * We pass in lr as zero (cleared in kernel_thread) and the caller
+ * part of the backtrace ABI on the stack also zeroed (in copy_thread)
+ * so that backtraces will stop with this function.
+ * Note that we don't use r0, since copy_thread() clears it.
+ */
+static void start_kernel_thread(int dummy, int (*fn)(int), int arg)
+{
+        do_exit(fn(arg));
+}
+
+/*
+ * Create a kernel thread
+ */
+int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+{
+        struct pt_regs regs;
+
+        memset(&regs, 0, sizeof(regs));
+        regs.ex1 = PL_ICS_EX1(KERNEL_PL, 0);  /* run at kernel PL, no ICS */
+        regs.pc = (long) start_kernel_thread;
+        regs.flags = PT_FLAGS_CALLER_SAVES;   /* need to restore r1 and r2 */
+        regs.regs[1] = (long) fn;             /* function pointer */
+        regs.regs[2] = (long) arg;            /* parameter register */
+
+        /* Ok, create the new process.. */
+        return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs,
+                       0, NULL, NULL);
+}
+EXPORT_SYMBOL(kernel_thread);
+
+/* Flush thread state. */
+void flush_thread(void)
+{
+        /* Nothing */
+}
+
+/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+        /* Nothing */
+}
+
+void show_regs(struct pt_regs *regs)
+{
+        struct task_struct *tsk = validate_current();
+        int i;
+
+        pr_err("\n");
+        pr_err(" Pid: %d, comm: %20s, CPU: %d\n",
+               tsk->pid, tsk->comm, smp_processor_id());
+#ifdef __tilegx__
+        for (i = 0; i < 51; i += 3)
+                pr_err(" r%-2d: "REGFMT" r%-2d: "REGFMT" r%-2d: "REGFMT"\n",
+                       i, regs->regs[i], i+1, regs->regs[i+1],
+                       i+2, regs->regs[i+2]);
+        pr_err(" r51: "REGFMT" r52: "REGFMT" tp : "REGFMT"\n",
+               regs->regs[51], regs->regs[52], regs->tp);
+        pr_err(" sp : "REGFMT" lr : "REGFMT"\n", regs->sp, regs->lr);
+#else
+        for (i = 0; i < 52; i += 3)
+                pr_err(" r%-2d: "REGFMT" r%-2d: "REGFMT
+                       " r%-2d: "REGFMT" r%-2d: "REGFMT"\n",
+                       i, regs->regs[i], i+1, regs->regs[i+1],
+                       i+2, regs->regs[i+2], i+3, regs->regs[i+3]);
+        pr_err(" r52: "REGFMT" tp : "REGFMT" sp : "REGFMT" lr : "REGFMT"\n",
+               regs->regs[52], regs->tp, regs->sp, regs->lr);
+#endif
+        pr_err(" pc : "REGFMT" ex1: %ld     faultnum: %ld\n",
+               regs->pc, regs->ex1, regs->faultnum);
+
+        dump_stack_regs(regs);
+}