[mirror_ubuntu-zesty-kernel.git] / arch / tile / kernel / process.c

/*
 * 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 <linux/tracehook.h>
#include <linux/signal.h>
#include <asm/stack.h>
#include <asm/switch_to.h>
#include <asm/homecache.h>
#include <asm/syscalls.h>
#include <asm/traps.h>
#include <asm/setup.h>
#include <asm/uaccess.h>
#ifdef CONFIG_HARDWALL
#include <asm/hardwall.h>
#endif
#include <arch/chip.h>
#include <arch/abi.h>
#include <arch/sim_def.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 __init idle_setup(char *str)
{
	if (!str)
		return -EINVAL;

	if (!strcmp(str, "poll")) {
		pr_info("using polling idle threads.\n");
		cpu_idle_poll_ctrl(true);
		return 0;
	} else if (!strcmp(str, "halt")) {
		return 0;
	}
	return -1;
}
early_param("idle", idle_setup);

void arch_cpu_idle(void)
{
	__get_cpu_var(irq_stat).idle_timestamp = jiffies;
	_cpu_idle();
}

/*
 * Release a thread_info structure
 */
void arch_release_thread_info(struct thread_info *info)
{
	struct single_step_state *step_state = info->step_state;

	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);
	}
}

static void save_arch_state(struct thread_struct *t);

int copy_thread(unsigned long clone_flags, unsigned long sp,
		unsigned long arg, struct task_struct *p)
{
	struct pt_regs *childregs = task_pt_regs(p);
	unsigned long ksp;
	unsigned long *callee_regs;

	/*
	 * Set up the stack and stack pointer appropriately for the
	 * new child to find itself woken up in __switch_to().
	 * The callee-saved registers must be on the stack to be read;
	 * the new task will then jump to assembly support to handle
	 * calling schedule_tail(), etc., and (for userspace tasks)
	 * returning to the context set up in the pt_regs.
	 */
	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);
	callee_regs = (unsigned long *)ksp;
	ksp -= C_ABI_SAVE_AREA_SIZE;   /* __switch_to() save area */
	((long *)ksp)[0] = ((long *)ksp)[1] = 0;
	p->thread.ksp = ksp;

	/* Record the pid of the task that created this one. */
	p->thread.creator_pid = current->pid;

	if (unlikely(p->flags & PF_KTHREAD)) {
		/* kernel thread */
		memset(childregs, 0, sizeof(struct pt_regs));
		memset(&callee_regs[2], 0,
		       (CALLEE_SAVED_REGS_COUNT - 2) * sizeof(unsigned long));
		callee_regs[0] = sp;   /* r30 = function */
		callee_regs[1] = arg;  /* r31 = arg */
		childregs->ex1 = PL_ICS_EX1(KERNEL_PL, 0);
		p->thread.pc = (unsigned long) ret_from_kernel_thread;
		return 0;
	}

	/*
	 * 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;

	/*
	 * Do not clone step state from the parent; each thread
	 * must make its own lazily.
	 */
	task_thread_info(p)->step_state = NULL;

#ifdef __tilegx__
	/*
	 * Do not clone unalign jit fixup from the parent; each thread
	 * must allocate its own on demand.
	 */
	task_thread_info(p)->unalign_jit_base = NULL;
#endif

	/*
	 * Copy the registers onto the kernel stack so the
	 * return-from-interrupt code will reload it into registers.
	 */
	*childregs = *current_pt_regs();
	childregs->regs[0] = 0;         /* return value is zero */
	if (sp)
		childregs->sp = sp;  /* override with new user stack pointer */
	memcpy(callee_regs, &childregs->regs[CALLEE_SAVED_FIRST_REG],
	       CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long));

	/* Save user stack top pointer so we can ID the stack vm area later. */
	p->thread.usp0 = childregs->sp;

	/*
	 * If CLONE_SETTLS is set, set "tp" in the new task to "r4",
	 * which is passed in as arg #5 to sys_clone().
	 */
	if (clone_flags & CLONE_SETTLS)
		childregs->tp = childregs->regs[4];


#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

	/* New thread has its miscellaneous processor state bits clear. */
	p->thread.proc_status = 0;

#ifdef CONFIG_HARDWALL
	/* New thread does not own any networks. */
	memset(&p->thread.hardwall[0], 0,
	       sizeof(struct hardwall_task) * HARDWALL_TYPES);
#endif


	/*
	 * Start the new thread with the current architecture state
	 * (user interrupt masks, etc.).
	 */
	save_arch_state(&p->thread);

	return 0;
}

int set_unalign_ctl(struct task_struct *tsk, unsigned int val)
{
	task_thread_info(tsk)->align_ctl = val;
	return 0;
}

int get_unalign_ctl(struct task_struct *tsk, unsigned long adr)
{
	return put_user(task_thread_info(tsk)->align_ctl,
			(unsigned int __user *)adr);
}

static struct task_struct corrupt_current = { .comm = "<corrupt>" };

/*
 * 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)
{
	struct task_struct *tsk = current;
	if (unlikely((unsigned long)tsk < PAGE_OFFSET ||
		     (high_memory && (void *)tsk > high_memory) ||
		     ((unsigned long)tsk & (__alignof__(*tsk) - 1)) != 0)) {
		pr_err("Corrupt 'current' %p (sp %#lx)\n", tsk, stack_pointer);
		tsk = &corrupt_current;
	}
	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)
{
#if CONFIG_KERNEL_PL == 2
	__insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1);
	__insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1);
#else
	__insn_mtspr(SPR_MPL_DMA_CPL_SET_0, 1);
	__insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_0, 1);
#endif
}

/* Forbid user processes from accessing the DMA SPRs */
void restrict_dma_mpls(void)
{
#if CONFIG_KERNEL_PL == 2
	__insn_mtspr(SPR_MPL_DMA_CPL_SET_2, 1);
	__insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_2, 1);
#else
	__insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1);
	__insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1);
#endif
}

/* 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);
	t->proc_status = __insn_mfspr(SPR_PROC_STATUS);
#if !CHIP_HAS_FIXED_INTVEC_BASE()
	t->interrupt_vector_base = __insn_mfspr(SPR_INTERRUPT_VECTOR_BASE_0);
#endif
	t->tile_rtf_hwm = __insn_mfspr(SPR_TILE_RTF_HWM);
#if CHIP_HAS_DSTREAM_PF()
	t->dstream_pf = __insn_mfspr(SPR_DSTREAM_PF);
#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);
	__insn_mtspr(SPR_PROC_STATUS, t->proc_status);
#if !CHIP_HAS_FIXED_INTVEC_BASE()
	__insn_mtspr(SPR_INTERRUPT_VECTOR_BASE_0, t->interrupt_vector_base);
#endif
	__insn_mtspr(SPR_TILE_RTF_HWM, t->tile_rtf_hwm);
#if CHIP_HAS_DSTREAM_PF()
	__insn_mtspr(SPR_DSTREAM_PF, t->dstream_pf);
#endif
}


void _prepare_arch_switch(struct task_struct *next)
{
#if CHIP_HAS_TILE_DMA()
	struct tile_dma_state *dma = &current->thread.tile_dma_state;
	if (dma->enabled)
		save_tile_dma_state(dma);
#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);

#ifdef CONFIG_HARDWALL
	/* Enable or disable access to the network registers appropriately. */
	hardwall_switch_tasks(prev, next);
#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_K_0 when we reset our sp.
	 */
	return __switch_to(prev, next, next_current_ksp0(next));
}

/*
 * This routine is called on return from interrupt if any of the
 * TIF_WORK_MASK flags are set in thread_info->flags.  It is
 * entered with interrupts disabled so we don't miss an event
 * that modified the thread_info flags.  If any flag is set, we
 * handle it and return, and the calling assembly code will
 * re-disable interrupts, reload the thread flags, and call back
 * if more flags need to be handled.
 *
 * We return whether we need to check the thread_info flags again
 * or not.  Note that we don't clear TIF_SINGLESTEP here, so it's
 * important that it be tested last, and then claim that we don't
 * need to recheck the flags.
 */
int do_work_pending(struct pt_regs *regs, u32 thread_info_flags)
{
	/* If we enter in kernel mode, do nothing and exit the caller loop. */
	if (!user_mode(regs))
		return 0;

	/* Enable interrupts; they are disabled again on return to caller. */
	local_irq_enable();

	if (thread_info_flags & _TIF_NEED_RESCHED) {
		schedule();
		return 1;
	}
#if CHIP_HAS_TILE_DMA()
	if (thread_info_flags & _TIF_ASYNC_TLB) {
		do_async_page_fault(regs);
		return 1;
	}
#endif
	if (thread_info_flags & _TIF_SIGPENDING) {
		do_signal(regs);
		return 1;
	}
	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
		clear_thread_flag(TIF_NOTIFY_RESUME);
		tracehook_notify_resume(regs);
		return 1;
	}
	if (thread_info_flags & _TIF_SINGLESTEP) {
		single_step_once(regs);
		return 0;
	}
	panic("work_pending: bad flags %#x\n", thread_info_flags);
}

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;
}

/* Flush thread state. */
void flush_thread(void)
{
	/* Nothing */
}

/*
 * Free current thread data structures etc..
 */
void exit_thread(void)
{
#ifdef CONFIG_HARDWALL
	/*
	 * Remove the task from the list of tasks that are associated
	 * with any live hardwalls.  (If the task that is exiting held
	 * the last reference to a hardwall fd, it would already have
	 * been released and deactivated at this point.)
	 */
	hardwall_deactivate_all(current);
#endif
}

void show_regs(struct pt_regs *regs)
{
	struct task_struct *tsk = validate_current();
	int i;

	pr_err("\n");
	if (tsk != &corrupt_current)
		show_regs_print_info(KERN_ERR);
#ifdef __tilegx__
	for (i = 0; i < 17; i++)
		pr_err(" r%-2d: "REGFMT" r%-2d: "REGFMT" r%-2d: "REGFMT"\n",
		       i, regs->regs[i], i+18, regs->regs[i+18],
		       i+36, regs->regs[i+36]);
	pr_err(" r17: "REGFMT" r35: "REGFMT" tp : "REGFMT"\n",
	       regs->regs[17], regs->regs[35], regs->tp);
	pr_err(" sp : "REGFMT" lr : "REGFMT"\n", regs->sp, regs->lr);
#else
	for (i = 0; i < 13; i++)
		pr_err(" r%-2d: "REGFMT" r%-2d: "REGFMT
		       " r%-2d: "REGFMT" r%-2d: "REGFMT"\n",
		       i, regs->regs[i], i+14, regs->regs[i+14],
		       i+27, regs->regs[i+27], i+40, regs->regs[i+40]);
	pr_err(" r13: "REGFMT" tp : "REGFMT" sp : "REGFMT" lr : "REGFMT"\n",
	       regs->regs[13], 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);
}
Commit	Line	Data
867e359b CM	1	/*
	2	* Copyright 2010 Tilera Corporation. All Rights Reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation, version 2.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	11	* NON INFRINGEMENT. See the GNU General Public License for
	12	* more details.
	13	*/
	14
	15	#include <linux/sched.h>
	16	#include <linux/preempt.h>
	17	#include <linux/module.h>
	18	#include <linux/fs.h>
	19	#include <linux/kprobes.h>
	20	#include <linux/elfcore.h>
	21	#include <linux/tick.h>
	22	#include <linux/init.h>
	23	#include <linux/mm.h>
	24	#include <linux/compat.h>
	25	#include <linux/hardirq.h>
	26	#include <linux/syscalls.h>
0707ad30	27	#include <linux/kernel.h>
313ce674 CM	28	#include <linux/tracehook.h>
313ce674 CM	29	#include <linux/signal.h>
867e359b	30	#include <asm/stack.h>
34f2c0ac	31	#include <asm/switch_to.h>
867e359b	32	#include <asm/homecache.h>
0707ad30	33	#include <asm/syscalls.h>
313ce674	34	#include <asm/traps.h>
bd119c69	35	#include <asm/setup.h>
2f9ac29e	36	#include <asm/uaccess.h>
0707ad30 CM	37	#ifdef CONFIG_HARDWALL
	38	#include <asm/hardwall.h>
	39	#endif
867e359b CM	40	#include <arch/chip.h>
867e359b CM	41	#include <arch/abi.h>
bd119c69	42	#include <arch/sim_def.h>
867e359b	43
867e359b CM	44	/*
	45	* Use the (x86) "idle=poll" option to prefer low latency when leaving the
	46	* idle loop over low power while in the idle loop, e.g. if we have
	47	* one thread per core and we want to get threads out of futex waits fast.
	48	*/
867e359b CM	49	static int __init idle_setup(char *str)
	50	{
	51	if (!str)
	52	return -EINVAL;
	53
	54	if (!strcmp(str, "poll")) {
0707ad30	55	pr_info("using polling idle threads.\n");
0dc8153c TG	56	cpu_idle_poll_ctrl(true);
	57	return 0;
	58	} else if (!strcmp(str, "halt")) {
	59	return 0;
	60	}
	61	return -1;
867e359b CM	62	}
	63	early_param("idle", idle_setup);
	64
0dc8153c	65	void arch_cpu_idle(void)
867e359b	66	{
0dc8153c TG	67	__get_cpu_var(irq_stat).idle_timestamp = jiffies;
0dc8153c TG	68	_cpu_idle();
867e359b CM	69	}
867e359b CM	70
867e359b	71	/*
d909a81b	72	* Release a thread_info structure
867e359b	73	*/
d909a81b	74	void arch_release_thread_info(struct thread_info *info)
867e359b CM	75	{
	76	struct single_step_state *step_state = info->step_state;
	77
867e359b CM	78	if (step_state) {
	79
	80	/*
	81	* FIXME: we don't munmap step_state->buffer
	82	* because the mm_struct for this process (info->task->mm)
	83	* has already been zeroed in exit_mm(). Keeping a
	84	* reference to it here seems like a bad move, so this
	85	* means we can't munmap() the buffer, and therefore if we
	86	* ptrace multiple threads in a process, we will slowly
	87	* leak user memory. (Note that as soon as the last
	88	* thread in a process dies, we will reclaim all user
	89	* memory including single-step buffers in the usual way.)
	90	* We should either assign a kernel VA to this buffer
	91	* somehow, or we should associate the buffer(s) with the
	92	* mm itself so we can clean them up that way.
	93	*/
	94	kfree(step_state);
	95	}
867e359b CM	96	}
	97
	98	static void save_arch_state(struct thread_struct *t);
	99
867e359b	100	int copy_thread(unsigned long clone_flags, unsigned long sp,
afa86fc4	101	unsigned long arg, struct task_struct *p)
867e359b	102	{
e69ddd33	103	struct pt_regs *childregs = task_pt_regs(p);
867e359b	104	unsigned long ksp;
0f8b9838	105	unsigned long *callee_regs;
867e359b CM	106
867e359b CM	107	/*
0f8b9838 CM	108	* Set up the stack and stack pointer appropriately for the
	109	* new child to find itself woken up in __switch_to().
	110	* The callee-saved registers must be on the stack to be read;
	111	* the new task will then jump to assembly support to handle
	112	* calling schedule_tail(), etc., and (for userspace tasks)
	113	* returning to the context set up in the pt_regs.
867e359b	114	*/
0f8b9838 CM	115	ksp = (unsigned long) childregs;
	116	ksp -= C_ABI_SAVE_AREA_SIZE; /* interrupt-entry save area */
	117	((long )ksp)[0] = ((long )ksp)[1] = 0;
	118	ksp -= CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long);
	119	callee_regs = (unsigned long *)ksp;
	120	ksp -= C_ABI_SAVE_AREA_SIZE; /* __switch_to() save area */
	121	((long )ksp)[0] = ((long )ksp)[1] = 0;
	122	p->thread.ksp = ksp;
867e359b	123
0f8b9838 CM	124	/* Record the pid of the task that created this one. */
	125	p->thread.creator_pid = current->pid;
	126
008f1794	127	if (unlikely(p->flags & PF_KTHREAD)) {
0f8b9838 CM	128	/* kernel thread */
	129	memset(childregs, 0, sizeof(struct pt_regs));
	130	memset(&callee_regs[2], 0,
	131	(CALLEE_SAVED_REGS_COUNT - 2) * sizeof(unsigned long));
	132	callee_regs[0] = sp; /* r30 = function */
	133	callee_regs[1] = arg; /* r31 = arg */
	134	childregs->ex1 = PL_ICS_EX1(KERNEL_PL, 0);
	135	p->thread.pc = (unsigned long) ret_from_kernel_thread;
	136	return 0;
	137	}
867e359b CM	138
	139	/*
	140	* Start new thread in ret_from_fork so it schedules properly
	141	* and then return from interrupt like the parent.
	142	*/
	143	p->thread.pc = (unsigned long) ret_from_fork;
	144
0f8b9838 CM	145	/*
	146	* Do not clone step state from the parent; each thread
	147	* must make its own lazily.
	148	*/
	149	task_thread_info(p)->step_state = NULL;
	150
2f9ac29e CM	151	#ifdef __tilegx__
	152	/*
	153	* Do not clone unalign jit fixup from the parent; each thread
	154	* must allocate its own on demand.
	155	*/
	156	task_thread_info(p)->unalign_jit_base = NULL;
	157	#endif
	158
867e359b CM	159	/*
	160	* Copy the registers onto the kernel stack so the
	161	* return-from-interrupt code will reload it into registers.
	162	*/
008f1794	163	childregs = current_pt_regs();
867e359b	164	childregs->regs[0] = 0; /* return value is zero */
008f1794 AV	165	if (sp)
	166	childregs->sp = sp; /* override with new user stack pointer */
	167	memcpy(callee_regs, &childregs->regs[CALLEE_SAVED_FIRST_REG],
0f8b9838	168	CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long));
867e359b	169
008f1794 AV	170	/* Save user stack top pointer so we can ID the stack vm area later. */
	171	p->thread.usp0 = childregs->sp;
	172
bc4cf2bb CM	173	/*
	174	* If CLONE_SETTLS is set, set "tp" in the new task to "r4",
	175	* which is passed in as arg #5 to sys_clone().
	176	*/
	177	if (clone_flags & CLONE_SETTLS)
008f1794	178	childregs->tp = childregs->regs[4];
bc4cf2bb	179
867e359b CM	180
	181	#if CHIP_HAS_TILE_DMA()
	182	/*
	183	* No DMA in the new thread. We model this on the fact that
	184	* fork() clears the pending signals, alarms, and aio for the child.
	185	*/
	186	memset(&p->thread.tile_dma_state, 0, sizeof(struct tile_dma_state));
	187	memset(&p->thread.dma_async_tlb, 0, sizeof(struct async_tlb));
	188	#endif
	189
867e359b CM	190	/* New thread has its miscellaneous processor state bits clear. */
867e359b CM	191	p->thread.proc_status = 0;
867e359b	192
0707ad30 CM	193	#ifdef CONFIG_HARDWALL
0707ad30 CM	194	/* New thread does not own any networks. */
b8ace083 CM	195	memset(&p->thread.hardwall[0], 0,
b8ace083 CM	196	sizeof(struct hardwall_task) * HARDWALL_TYPES);
0707ad30	197	#endif
867e359b CM	198
	199
	200	/*
	201	* Start the new thread with the current architecture state
	202	* (user interrupt masks, etc.).
	203	*/
	204	save_arch_state(&p->thread);
	205
	206	return 0;
	207	}
	208
2f9ac29e CM	209	int set_unalign_ctl(struct task_struct *tsk, unsigned int val)
	210	{
	211	task_thread_info(tsk)->align_ctl = val;
	212	return 0;
	213	}
	214
	215	int get_unalign_ctl(struct task_struct *tsk, unsigned long adr)
	216	{
	217	return put_user(task_thread_info(tsk)->align_ctl,
	218	(unsigned int __user *)adr);
	219	}
	220
4036c7d3 CM	221	static struct task_struct corrupt_current = { .comm = "<corrupt>" };
4036c7d3 CM	222
867e359b CM	223	/*
	224	* Return "current" if it looks plausible, or else a pointer to a dummy.
	225	* This can be helpful if we are just trying to emit a clean panic.
	226	*/
	227	struct task_struct *validate_current(void)
	228	{
867e359b CM	229	struct task_struct *tsk = current;
867e359b CM	230	if (unlikely((unsigned long)tsk < PAGE_OFFSET \|\|
b287f696	231	(high_memory && (void *)tsk > high_memory) \|\|
867e359b	232	((unsigned long)tsk & (__alignof__(*tsk) - 1)) != 0)) {
0707ad30	233	pr_err("Corrupt 'current' %p (sp %#lx)\n", tsk, stack_pointer);
4036c7d3	234	tsk = &corrupt_current;
867e359b CM	235	}
	236	return tsk;
	237	}
	238
	239	/* Take and return the pointer to the previous task, for schedule_tail(). */
	240	struct task_struct sim_notify_fork(struct task_struct prev)
	241	{
	242	struct task_struct *tsk = current;
	243	__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_FORK_PARENT \|
	244	(tsk->thread.creator_pid << _SIM_CONTROL_OPERATOR_BITS));
	245	__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_FORK \|
	246	(tsk->pid << _SIM_CONTROL_OPERATOR_BITS));
	247	return prev;
	248	}
	249
	250	int dump_task_regs(struct task_struct tsk, elf_gregset_t regs)
	251	{
	252	struct pt_regs *ptregs = task_pt_regs(tsk);
	253	elf_core_copy_regs(regs, ptregs);
	254	return 1;
	255	}
	256
	257	#if CHIP_HAS_TILE_DMA()
	258
	259	/* Allow user processes to access the DMA SPRs */
	260	void grant_dma_mpls(void)
	261	{
a78c942d CM	262	#if CONFIG_KERNEL_PL == 2
	263	__insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1);
	264	__insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1);
	265	#else
867e359b CM	266	__insn_mtspr(SPR_MPL_DMA_CPL_SET_0, 1);
867e359b CM	267	__insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_0, 1);
a78c942d	268	#endif
867e359b CM	269	}
	270
	271	/* Forbid user processes from accessing the DMA SPRs */
	272	void restrict_dma_mpls(void)
	273	{
a78c942d CM	274	#if CONFIG_KERNEL_PL == 2
	275	__insn_mtspr(SPR_MPL_DMA_CPL_SET_2, 1);
	276	__insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_2, 1);
	277	#else
867e359b CM	278	__insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1);
867e359b CM	279	__insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1);
a78c942d	280	#endif
867e359b CM	281	}
	282
	283	/* Pause the DMA engine, then save off its state registers. */
	284	static void save_tile_dma_state(struct tile_dma_state *dma)
	285	{
	286	unsigned long state = __insn_mfspr(SPR_DMA_USER_STATUS);
	287	unsigned long post_suspend_state;
	288
	289	/* If we're running, suspend the engine. */
	290	if ((state & DMA_STATUS_MASK) == SPR_DMA_STATUS__RUNNING_MASK)
	291	__insn_mtspr(SPR_DMA_CTR, SPR_DMA_CTR__SUSPEND_MASK);
	292
	293	/*
	294	* Wait for the engine to idle, then save regs. Note that we
	295	* want to record the "running" bit from before suspension,
	296	* and the "done" bit from after, so that we can properly
	297	* distinguish a case where the user suspended the engine from
	298	* the case where the kernel suspended as part of the context
	299	* swap.
	300	*/
	301	do {
	302	post_suspend_state = __insn_mfspr(SPR_DMA_USER_STATUS);
	303	} while (post_suspend_state & SPR_DMA_STATUS__BUSY_MASK);
	304
	305	dma->src = __insn_mfspr(SPR_DMA_SRC_ADDR);
	306	dma->src_chunk = __insn_mfspr(SPR_DMA_SRC_CHUNK_ADDR);
	307	dma->dest = __insn_mfspr(SPR_DMA_DST_ADDR);
	308	dma->dest_chunk = __insn_mfspr(SPR_DMA_DST_CHUNK_ADDR);
	309	dma->strides = __insn_mfspr(SPR_DMA_STRIDE);
	310	dma->chunk_size = __insn_mfspr(SPR_DMA_CHUNK_SIZE);
	311	dma->byte = __insn_mfspr(SPR_DMA_BYTE);
	312	dma->status = (state & SPR_DMA_STATUS__RUNNING_MASK) \|
	313	(post_suspend_state & SPR_DMA_STATUS__DONE_MASK);
	314	}
	315
	316	/* Restart a DMA that was running before we were context-switched out. */
	317	static void restore_tile_dma_state(struct thread_struct *t)
	318	{
	319	const struct tile_dma_state *dma = &t->tile_dma_state;
	320
	321	/*
	322	* The only way to restore the done bit is to run a zero
	323	* length transaction.
	324	*/
	325	if ((dma->status & SPR_DMA_STATUS__DONE_MASK) &&
	326	!(__insn_mfspr(SPR_DMA_USER_STATUS) & SPR_DMA_STATUS__DONE_MASK)) {
	327	__insn_mtspr(SPR_DMA_BYTE, 0);
	328	__insn_mtspr(SPR_DMA_CTR, SPR_DMA_CTR__REQUEST_MASK);
	329	while (__insn_mfspr(SPR_DMA_USER_STATUS) &
	330	SPR_DMA_STATUS__BUSY_MASK)
	331	;
	332	}
	333
	334	__insn_mtspr(SPR_DMA_SRC_ADDR, dma->src);
	335	__insn_mtspr(SPR_DMA_SRC_CHUNK_ADDR, dma->src_chunk);
	336	__insn_mtspr(SPR_DMA_DST_ADDR, dma->dest);
	337	__insn_mtspr(SPR_DMA_DST_CHUNK_ADDR, dma->dest_chunk);
	338	__insn_mtspr(SPR_DMA_STRIDE, dma->strides);
	339	__insn_mtspr(SPR_DMA_CHUNK_SIZE, dma->chunk_size);
	340	__insn_mtspr(SPR_DMA_BYTE, dma->byte);
	341
	342	/*
	343	* Restart the engine if we were running and not done.
	344	* Clear a pending async DMA fault that we were waiting on return
345	* to user space to execute, since we expect the DMA engine
346	* to regenerate those faults for us now. Note that we don't
347	* try to clear the TIF_ASYNC_TLB flag, since it's relatively
348	* harmless if set, and it covers both DMA and the SN processor.
349	*/
350	if ((dma->status & DMA_STATUS_MASK) == SPR_DMA_STATUS__RUNNING_MASK) {
351	t->dma_async_tlb.fault_num = 0;
352	__insn_mtspr(SPR_DMA_CTR, SPR_DMA_CTR__REQUEST_MASK);
353	}
354	}
355
356	#endif
357
358	static void save_arch_state(struct thread_struct *t)
359	{
360	#if CHIP_HAS_SPLIT_INTR_MASK()
361	t->interrupt_mask = __insn_mfspr(SPR_INTERRUPT_MASK_0_0) \|
362	((u64)__insn_mfspr(SPR_INTERRUPT_MASK_0_1) << 32);
363	#else
364	t->interrupt_mask = __insn_mfspr(SPR_INTERRUPT_MASK_0);
365	#endif
366	t->ex_context[0] = __insn_mfspr(SPR_EX_CONTEXT_0_0);
367	t->ex_context[1] = __insn_mfspr(SPR_EX_CONTEXT_0_1);
368	t->system_save[0] = __insn_mfspr(SPR_SYSTEM_SAVE_0_0);
369	t->system_save[1] = __insn_mfspr(SPR_SYSTEM_SAVE_0_1);
370	t->system_save[2] = __insn_mfspr(SPR_SYSTEM_SAVE_0_2);
371	t->system_save[3] = __insn_mfspr(SPR_SYSTEM_SAVE_0_3);
372	t->intctrl_0 = __insn_mfspr(SPR_INTCTRL_0_STATUS);
867e359b	373	t->proc_status = __insn_mfspr(SPR_PROC_STATUS);
a802fc68 CM	374	#if !CHIP_HAS_FIXED_INTVEC_BASE()
	375	t->interrupt_vector_base = __insn_mfspr(SPR_INTERRUPT_VECTOR_BASE_0);
	376	#endif
a802fc68	377	t->tile_rtf_hwm = __insn_mfspr(SPR_TILE_RTF_HWM);
a802fc68 CM	378	#if CHIP_HAS_DSTREAM_PF()
	379	t->dstream_pf = __insn_mfspr(SPR_DSTREAM_PF);
	380	#endif
867e359b CM	381	}
	382
	383	static void restore_arch_state(const struct thread_struct *t)
	384	{
	385	#if CHIP_HAS_SPLIT_INTR_MASK()
	386	__insn_mtspr(SPR_INTERRUPT_MASK_0_0, (u32) t->interrupt_mask);
	387	__insn_mtspr(SPR_INTERRUPT_MASK_0_1, t->interrupt_mask >> 32);
	388	#else
	389	__insn_mtspr(SPR_INTERRUPT_MASK_0, t->interrupt_mask);
	390	#endif
	391	__insn_mtspr(SPR_EX_CONTEXT_0_0, t->ex_context[0]);
	392	__insn_mtspr(SPR_EX_CONTEXT_0_1, t->ex_context[1]);
	393	__insn_mtspr(SPR_SYSTEM_SAVE_0_0, t->system_save[0]);
	394	__insn_mtspr(SPR_SYSTEM_SAVE_0_1, t->system_save[1]);
	395	__insn_mtspr(SPR_SYSTEM_SAVE_0_2, t->system_save[2]);
	396	__insn_mtspr(SPR_SYSTEM_SAVE_0_3, t->system_save[3]);
	397	__insn_mtspr(SPR_INTCTRL_0_STATUS, t->intctrl_0);
867e359b	398	__insn_mtspr(SPR_PROC_STATUS, t->proc_status);
a802fc68 CM	399	#if !CHIP_HAS_FIXED_INTVEC_BASE()
	400	__insn_mtspr(SPR_INTERRUPT_VECTOR_BASE_0, t->interrupt_vector_base);
	401	#endif
a802fc68	402	__insn_mtspr(SPR_TILE_RTF_HWM, t->tile_rtf_hwm);
a802fc68 CM	403	#if CHIP_HAS_DSTREAM_PF()
a802fc68 CM	404	__insn_mtspr(SPR_DSTREAM_PF, t->dstream_pf);
867e359b CM	405	#endif
	406	}
	407
	408
	409	void _prepare_arch_switch(struct task_struct *next)
	410	{
867e359b CM	411	#if CHIP_HAS_TILE_DMA()
	412	struct tile_dma_state *dma = &current->thread.tile_dma_state;
	413	if (dma->enabled)
	414	save_tile_dma_state(dma);
	415	#endif
867e359b CM	416	}
	417
	418
867e359b CM	419	struct task_struct __sched _switch_to(struct task_struct prev,
	420	struct task_struct *next)
	421	{
	422	/* DMA state is already saved; save off other arch state. */
	423	save_arch_state(&prev->thread);
	424
	425	#if CHIP_HAS_TILE_DMA()
	426	/*
	427	* Restore DMA in new task if desired.
	428	* Note that it is only safe to restart here since interrupts
	429	* are disabled, so we can't take any DMATLB miss or access
	430	* interrupts before we have finished switching stacks.
	431	*/
	432	if (next->thread.tile_dma_state.enabled) {
	433	restore_tile_dma_state(&next->thread);
	434	grant_dma_mpls();
	435	} else {
	436	restrict_dma_mpls();
	437	}
	438	#endif
	439
	440	/* Restore other arch state. */
	441	restore_arch_state(&next->thread);
	442
0707ad30 CM	443	#ifdef CONFIG_HARDWALL
0707ad30 CM	444	/* Enable or disable access to the network registers appropriately. */
b8ace083	445	hardwall_switch_tasks(prev, next);
0707ad30	446	#endif
867e359b CM	447
	448	/*
	449	* Switch kernel SP, PC, and callee-saved registers.
	450	* In the context of the new task, return the old task pointer
	451	* (i.e. the task that actually called __switch_to).
a78c942d	452	* Pass the value to use for SYSTEM_SAVE_K_0 when we reset our sp.
867e359b CM	453	*/
	454	return __switch_to(prev, next, next_current_ksp0(next));
	455	}
	456
313ce674 CM	457	/*
	458	* This routine is called on return from interrupt if any of the
	459	* TIF_WORK_MASK flags are set in thread_info->flags. It is
	460	* entered with interrupts disabled so we don't miss an event
	461	* that modified the thread_info flags. If any flag is set, we
	462	* handle it and return, and the calling assembly code will
	463	* re-disable interrupts, reload the thread flags, and call back
	464	* if more flags need to be handled.
	465	*
	466	* We return whether we need to check the thread_info flags again
	467	* or not. Note that we don't clear TIF_SINGLESTEP here, so it's
	468	* important that it be tested last, and then claim that we don't
	469	* need to recheck the flags.
	470	*/
	471	int do_work_pending(struct pt_regs *regs, u32 thread_info_flags)
	472	{
fc327e26 CM	473	/* If we enter in kernel mode, do nothing and exit the caller loop. */
	474	if (!user_mode(regs))
	475	return 0;
	476
c19c6c95 CM	477	/* Enable interrupts; they are disabled again on return to caller. */
	478	local_irq_enable();
	479
313ce674 CM	480	if (thread_info_flags & _TIF_NEED_RESCHED) {
	481	schedule();
	482	return 1;
	483	}
d7c96611	484	#if CHIP_HAS_TILE_DMA()
313ce674 CM	485	if (thread_info_flags & _TIF_ASYNC_TLB) {
	486	do_async_page_fault(regs);
	487	return 1;
	488	}
	489	#endif
	490	if (thread_info_flags & _TIF_SIGPENDING) {
	491	do_signal(regs);
	492	return 1;
	493	}
	494	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	495	clear_thread_flag(TIF_NOTIFY_RESUME);
	496	tracehook_notify_resume(regs);
313ce674 CM	497	return 1;
	498	}
	499	if (thread_info_flags & _TIF_SINGLESTEP) {
fc327e26	500	single_step_once(regs);
313ce674 CM	501	return 0;
	502	}
	503	panic("work_pending: bad flags %#x\n", thread_info_flags);
	504	}
	505
867e359b CM	506	unsigned long get_wchan(struct task_struct *p)
	507	{
	508	struct KBacktraceIterator kbt;
	509
	510	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	511	return 0;
	512
	513	for (KBacktraceIterator_init(&kbt, p, NULL);
	514	!KBacktraceIterator_end(&kbt);
	515	KBacktraceIterator_next(&kbt)) {
	516	if (!in_sched_functions(kbt.it.pc))
	517	return kbt.it.pc;
	518	}
	519
	520	return 0;
	521	}
	522
867e359b CM	523	/* Flush thread state. */
	524	void flush_thread(void)
	525	{
	526	/* Nothing */
	527	}
	528
	529	/*
	530	* Free current thread data structures etc..
	531	*/
	532	void exit_thread(void)
	533	{
7d937719 CM	534	#ifdef CONFIG_HARDWALL
	535	/*
	536	* Remove the task from the list of tasks that are associated
	537	* with any live hardwalls. (If the task that is exiting held
	538	* the last reference to a hardwall fd, it would already have
	539	* been released and deactivated at this point.)
	540	*/
	541	hardwall_deactivate_all(current);
	542	#endif
867e359b CM	543	}
867e359b CM	544
867e359b CM	545	void show_regs(struct pt_regs *regs)
	546	{
	547	struct task_struct *tsk = validate_current();
0707ad30 CM	548	int i;
	549
	550	pr_err("\n");
4036c7d3 CM	551	if (tsk != &corrupt_current)
4036c7d3 CM	552	show_regs_print_info(KERN_ERR);
0707ad30	553	#ifdef __tilegx__
dadf78bf	554	for (i = 0; i < 17; i++)
0707ad30	555	pr_err(" r%-2d: "REGFMT" r%-2d: "REGFMT" r%-2d: "REGFMT"\n",
dadf78bf CM	556	i, regs->regs[i], i+18, regs->regs[i+18],
	557	i+36, regs->regs[i+36]);
	558	pr_err(" r17: "REGFMT" r35: "REGFMT" tp : "REGFMT"\n",
	559	regs->regs[17], regs->regs[35], regs->tp);
0707ad30 CM	560	pr_err(" sp : "REGFMT" lr : "REGFMT"\n", regs->sp, regs->lr);
0707ad30 CM	561	#else
dadf78bf	562	for (i = 0; i < 13; i++)
0707ad30 CM	563	pr_err(" r%-2d: "REGFMT" r%-2d: "REGFMT
0707ad30 CM	564	" r%-2d: "REGFMT" r%-2d: "REGFMT"\n",
dadf78bf CM	565	i, regs->regs[i], i+14, regs->regs[i+14],
	566	i+27, regs->regs[i+27], i+40, regs->regs[i+40]);
	567	pr_err(" r13: "REGFMT" tp : "REGFMT" sp : "REGFMT" lr : "REGFMT"\n",
	568	regs->regs[13], regs->tp, regs->sp, regs->lr);
0707ad30 CM	569	#endif
0707ad30 CM	570	pr_err(" pc : "REGFMT" ex1: %ld faultnum: %ld\n",
867e359b CM	571	regs->pc, regs->ex1, regs->faultnum);
	572
	573	dump_stack_regs(regs);
	574	}