1 files changed, 0 insertions, 527 deletions

diff --git a/arch/tile/kernel/kprobes.c b/arch/tile/kernel/kprobes.c
deleted file mode 100644
index c68694bb1ad2..000000000000
--- a/arch/tile/kernel/kprobes.c
+++ /dev/null
@@ -1,527 +0,0 @@
-/*
- * arch/tile/kernel/kprobes.c
- * Kprobes on TILE-Gx
- *
- * Some portions copied from the MIPS version.
- *
- * Copyright (C) IBM Corporation, 2002, 2004
- * Copyright 2006 Sony Corp.
- * Copyright 2010 Cavium Networks
- *
- * Copyright 2012 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/kprobes.h>
-#include <linux/kdebug.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-#include <asm/cacheflush.h>
-
-#include <arch/opcode.h>
-
-DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
-DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
-
-tile_bundle_bits breakpoint_insn = TILEGX_BPT_BUNDLE;
-tile_bundle_bits breakpoint2_insn = TILEGX_BPT_BUNDLE | DIE_SSTEPBP;
-
-/*
- * Check whether instruction is branch or jump, or if executing it
- * has different results depending on where it is executed (e.g. lnk).
- */
-static int __kprobes insn_has_control(kprobe_opcode_t insn)
-{
-	if (get_Mode(insn) != 0) {   /* Y-format bundle */
-		if (get_Opcode_Y1(insn) != RRR_1_OPCODE_Y1 ||
-		    get_RRROpcodeExtension_Y1(insn) != UNARY_RRR_1_OPCODE_Y1)
-			return 0;
-
-		switch (get_UnaryOpcodeExtension_Y1(insn)) {
-		case JALRP_UNARY_OPCODE_Y1:
-		case JALR_UNARY_OPCODE_Y1:
-		case JRP_UNARY_OPCODE_Y1:
-		case JR_UNARY_OPCODE_Y1:
-		case LNK_UNARY_OPCODE_Y1:
-			return 1;
-		default:
-			return 0;
-		}
-	}
-
-	switch (get_Opcode_X1(insn)) {
-	case BRANCH_OPCODE_X1:	/* branch instructions */
-	case JUMP_OPCODE_X1:	/* jump instructions: j and jal */
-		return 1;
-
-	case RRR_0_OPCODE_X1:   /* other jump instructions */
-		if (get_RRROpcodeExtension_X1(insn) != UNARY_RRR_0_OPCODE_X1)
-			return 0;
-		switch (get_UnaryOpcodeExtension_X1(insn)) {
-		case JALRP_UNARY_OPCODE_X1:
-		case JALR_UNARY_OPCODE_X1:
-		case JRP_UNARY_OPCODE_X1:
-		case JR_UNARY_OPCODE_X1:
-		case LNK_UNARY_OPCODE_X1:
-			return 1;
-		default:
-			return 0;
-		}
-	default:
-		return 0;
-	}
-}
-
-int __kprobes arch_prepare_kprobe(struct kprobe *p)
-{
-	unsigned long addr = (unsigned long)p->addr;
-
-	if (addr & (sizeof(kprobe_opcode_t) - 1))
-		return -EINVAL;
-
-	if (insn_has_control(*p->addr)) {
-		pr_notice("Kprobes for control instructions are not supported\n");
-		return -EINVAL;
-	}
-
-	/* insn: must be on special executable page on tile. */
-	p->ainsn.insn = get_insn_slot();
-	if (!p->ainsn.insn)
-		return -ENOMEM;
-
-	/*
-	 * In the kprobe->ainsn.insn[] array we store the original
-	 * instruction at index zero and a break trap instruction at
-	 * index one.
-	 */
-	memcpy(&p->ainsn.insn[0], p->addr, sizeof(kprobe_opcode_t));
-	p->ainsn.insn[1] = breakpoint2_insn;
-	p->opcode = *p->addr;
-
-	return 0;
-}
-
-void __kprobes arch_arm_kprobe(struct kprobe *p)
-{
-	unsigned long addr_wr;
-
-	/* Operate on writable kernel text mapping. */
-	addr_wr = ktext_writable_addr(p->addr);
-
-	if (probe_kernel_write((void *)addr_wr, &breakpoint_insn,
-		sizeof(breakpoint_insn)))
-		pr_err("%s: failed to enable kprobe\n", __func__);
-
-	smp_wmb();
-	flush_insn_slot(p);
-}
-
-void __kprobes arch_disarm_kprobe(struct kprobe *kp)
-{
-	unsigned long addr_wr;
-
-	/* Operate on writable kernel text mapping. */
-	addr_wr = ktext_writable_addr(kp->addr);
-
-	if (probe_kernel_write((void *)addr_wr, &kp->opcode,
-		sizeof(kp->opcode)))
-		pr_err("%s: failed to enable kprobe\n", __func__);
-
-	smp_wmb();
-	flush_insn_slot(kp);
-}
-
-void __kprobes arch_remove_kprobe(struct kprobe *p)
-{
-	if (p->ainsn.insn) {
-		free_insn_slot(p->ainsn.insn, 0);
-		p->ainsn.insn = NULL;
-	}
-}
-
-static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
-{
-	kcb->prev_kprobe.kp = kprobe_running();
-	kcb->prev_kprobe.status = kcb->kprobe_status;
-	kcb->prev_kprobe.saved_pc = kcb->kprobe_saved_pc;
-}
-
-static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
-{
-	__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
-	kcb->kprobe_status = kcb->prev_kprobe.status;
-	kcb->kprobe_saved_pc = kcb->prev_kprobe.saved_pc;
-}
-
-static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
-			struct kprobe_ctlblk *kcb)
-{
-	__this_cpu_write(current_kprobe, p);
-	kcb->kprobe_saved_pc = regs->pc;
-}
-
-static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
-{
-	/* Single step inline if the instruction is a break. */
-	if (p->opcode == breakpoint_insn ||
-	    p->opcode == breakpoint2_insn)
-		regs->pc = (unsigned long)p->addr;
-	else
-		regs->pc = (unsigned long)&p->ainsn.insn[0];
-}
-
-static int __kprobes kprobe_handler(struct pt_regs *regs)
-{
-	struct kprobe *p;
-	int ret = 0;
-	kprobe_opcode_t *addr;
-	struct kprobe_ctlblk *kcb;
-
-	addr = (kprobe_opcode_t *)regs->pc;
-
-	/*
-	 * We don't want to be preempted for the entire
-	 * duration of kprobe processing.
-	 */
-	preempt_disable();
-	kcb = get_kprobe_ctlblk();
-
-	/* Check we're not actually recursing. */
-	if (kprobe_running()) {
-		p = get_kprobe(addr);
-		if (p) {
-			if (kcb->kprobe_status == KPROBE_HIT_SS &&
-			    p->ainsn.insn[0] == breakpoint_insn) {
-				goto no_kprobe;
-			}
-			/*
-			 * We have reentered the kprobe_handler(), since
-			 * another probe was hit while within the handler.
-			 * We here save the original kprobes variables and
-			 * just single step on the instruction of the new probe
-			 * without calling any user handlers.
-			 */
-			save_previous_kprobe(kcb);
-			set_current_kprobe(p, regs, kcb);
-			kprobes_inc_nmissed_count(p);
-			prepare_singlestep(p, regs);
-			kcb->kprobe_status = KPROBE_REENTER;
-			return 1;
-		} else {
-			if (*addr != breakpoint_insn) {
-				/*
-				 * The breakpoint instruction was removed by
-				 * another cpu right after we hit, no further
-				 * handling of this interrupt is appropriate.
-				 */
-				ret = 1;
-				goto no_kprobe;
-			}
-			p = __this_cpu_read(current_kprobe);
-			if (p->break_handler && p->break_handler(p, regs))
-				goto ss_probe;
-		}
-		goto no_kprobe;
-	}
-
-	p = get_kprobe(addr);
-	if (!p) {
-		if (*addr != breakpoint_insn) {
-			/*
-			 * The breakpoint instruction was removed right
-			 * after we hit it.  Another cpu has removed
-			 * either a probepoint or a debugger breakpoint
-			 * at this address.  In either case, no further
-			 * handling of this interrupt is appropriate.
-			 */
-			ret = 1;
-		}
-		/* Not one of ours: let kernel handle it. */
-		goto no_kprobe;
-	}
-
-	set_current_kprobe(p, regs, kcb);
-	kcb->kprobe_status = KPROBE_HIT_ACTIVE;
-
-	if (p->pre_handler && p->pre_handler(p, regs)) {
-		/* Handler has already set things up, so skip ss setup. */
-		return 1;
-	}
-
-ss_probe:
-	prepare_singlestep(p, regs);
-	kcb->kprobe_status = KPROBE_HIT_SS;
-	return 1;
-
-no_kprobe:
-	preempt_enable_no_resched();
-	return ret;
-}
-
-/*
- * Called after single-stepping.  p->addr is the address of the
- * instruction that has been replaced by the breakpoint. To avoid the
- * SMP problems that can occur when we temporarily put back the
- * original opcode to single-step, we single-stepped a copy of the
- * instruction.  The address of this copy is p->ainsn.insn.
- *
- * This function prepares to return from the post-single-step
- * breakpoint trap.
- */
-static void __kprobes resume_execution(struct kprobe *p,
-				       struct pt_regs *regs,
-				       struct kprobe_ctlblk *kcb)
-{
-	unsigned long orig_pc = kcb->kprobe_saved_pc;
-	regs->pc = orig_pc + 8;
-}
-
-static inline int post_kprobe_handler(struct pt_regs *regs)
-{
-	struct kprobe *cur = kprobe_running();
-	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
-
-	if (!cur)
-		return 0;
-
-	if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) {
-		kcb->kprobe_status = KPROBE_HIT_SSDONE;
-		cur->post_handler(cur, regs, 0);
-	}
-
-	resume_execution(cur, regs, kcb);
-
-	/* Restore back the original saved kprobes variables and continue. */
-	if (kcb->kprobe_status == KPROBE_REENTER) {
-		restore_previous_kprobe(kcb);
-		goto out;
-	}
-	reset_current_kprobe();
-out:
-	preempt_enable_no_resched();
-
-	return 1;
-}
-
-static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
-{
-	struct kprobe *cur = kprobe_running();
-	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
-
-	if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
-		return 1;
-
-	if (kcb->kprobe_status & KPROBE_HIT_SS) {
-		/*
-		 * We are here because the instruction being single
-		 * stepped caused a page fault. We reset the current
-		 * kprobe and the ip points back to the probe address
-		 * and allow the page fault handler to continue as a
-		 * normal page fault.
-		 */
-		resume_execution(cur, regs, kcb);
-		reset_current_kprobe();
-		preempt_enable_no_resched();
-	}
-	return 0;
-}
-
-/*
- * Wrapper routine for handling exceptions.
- */
-int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
-				       unsigned long val, void *data)
-{
-	struct die_args *args = (struct die_args *)data;
-	int ret = NOTIFY_DONE;
-
-	switch (val) {
-	case DIE_BREAK:
-		if (kprobe_handler(args->regs))
-			ret = NOTIFY_STOP;
-		break;
-	case DIE_SSTEPBP:
-		if (post_kprobe_handler(args->regs))
-			ret = NOTIFY_STOP;
-		break;
-	case DIE_PAGE_FAULT:
-		/* kprobe_running() needs smp_processor_id(). */
-		preempt_disable();
-
-		if (kprobe_running()
-		    && kprobe_fault_handler(args->regs, args->trapnr))
-			ret = NOTIFY_STOP;
-		preempt_enable();
-		break;
-	default:
-		break;
-	}
-	return ret;
-}
-
-int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
-{
-	struct jprobe *jp = container_of(p, struct jprobe, kp);
-	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
-
-	kcb->jprobe_saved_regs = *regs;
-	kcb->jprobe_saved_sp = regs->sp;
-
-	memcpy(kcb->jprobes_stack, (void *)kcb->jprobe_saved_sp,
-	       MIN_JPROBES_STACK_SIZE(kcb->jprobe_saved_sp));
-
-	regs->pc = (unsigned long)(jp->entry);
-
-	return 1;
-}
-
-/* Defined in the inline asm below. */
-void jprobe_return_end(void);
-
-void __kprobes jprobe_return(void)
-{
-	asm volatile(
-		"bpt\n\t"
-		".globl jprobe_return_end\n"
-		"jprobe_return_end:\n");
-}
-
-int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
-{
-	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
-
-	if (regs->pc >= (unsigned long)jprobe_return &&
-	    regs->pc <= (unsigned long)jprobe_return_end) {
-		*regs = kcb->jprobe_saved_regs;
-		memcpy((void *)kcb->jprobe_saved_sp, kcb->jprobes_stack,
-		       MIN_JPROBES_STACK_SIZE(kcb->jprobe_saved_sp));
-		preempt_enable_no_resched();
-
-		return 1;
-	}
-	return 0;
-}
-
-/*
- * Function return probe trampoline:
- * - init_kprobes() establishes a probepoint here
- * - When the probed function returns, this probe causes the
- *   handlers to fire
- */
-static void __used kretprobe_trampoline_holder(void)
-{
-	asm volatile(
-		"nop\n\t"
-		".global kretprobe_trampoline\n"
-		"kretprobe_trampoline:\n\t"
-		"nop\n\t"
-		: : : "memory");
-}
-
-void kretprobe_trampoline(void);
-
-void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
-				      struct pt_regs *regs)
-{
-	ri->ret_addr = (kprobe_opcode_t *) regs->lr;
-
-	/* Replace the return addr with trampoline addr */
-	regs->lr = (unsigned long)kretprobe_trampoline;
-}
-
-/*
- * Called when the probe at kretprobe trampoline is hit.
- */
-static int __kprobes trampoline_probe_handler(struct kprobe *p,
-						struct pt_regs *regs)
-{
-	struct kretprobe_instance *ri = NULL;
-	struct hlist_head *head, empty_rp;
-	struct hlist_node *tmp;
-	unsigned long flags, orig_ret_address = 0;
-	unsigned long trampoline_address = (unsigned long)kretprobe_trampoline;
-
-	INIT_HLIST_HEAD(&empty_rp);
-	kretprobe_hash_lock(current, &head, &flags);
-
-	/*
-	 * It is possible to have multiple instances associated with a given
-	 * task either because multiple functions in the call path have
-	 * a return probe installed on them, and/or more than one return
-	 * return probe was registered for a target function.
-	 *
-	 * We can handle this because:
-	 *     - instances are always inserted at the head of the list
-	 *     - when multiple return probes are registered for the same
-	 *       function, the first instance's ret_addr will point to the
-	 *       real return address, and all the rest will point to
-	 *       kretprobe_trampoline
-	 */
-	hlist_for_each_entry_safe(ri, tmp, head, hlist) {
-		if (ri->task != current)
-			/* another task is sharing our hash bucket */
-			continue;
-
-		if (ri->rp && ri->rp->handler)
-			ri->rp->handler(ri, regs);
-
-		orig_ret_address = (unsigned long)ri->ret_addr;
-		recycle_rp_inst(ri, &empty_rp);
-
-		if (orig_ret_address != trampoline_address) {
-			/*
-			 * This is the real return address. Any other
-			 * instances associated with this task are for
-			 * other calls deeper on the call stack
-			 */
-			break;
-		}
-	}
-
-	kretprobe_assert(ri, orig_ret_address, trampoline_address);
-	instruction_pointer(regs) = orig_ret_address;
-
-	reset_current_kprobe();
-	kretprobe_hash_unlock(current, &flags);
-	preempt_enable_no_resched();
-
-	hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) {
-		hlist_del(&ri->hlist);
-		kfree(ri);
-	}
-	/*
-	 * By returning a non-zero value, we are telling
-	 * kprobe_handler() that we don't want the post_handler
-	 * to run (and have re-enabled preemption)
-	 */
-	return 1;
-}
-
-int __kprobes arch_trampoline_kprobe(struct kprobe *p)
-{
-	if (p->addr == (kprobe_opcode_t *)kretprobe_trampoline)
-		return 1;
-
-	return 0;
-}
-
-static struct kprobe trampoline_p = {
-	.addr = (kprobe_opcode_t *)kretprobe_trampoline,
-	.pre_handler = trampoline_probe_handler
-};
-
-int __init arch_init_kprobes(void)
-{
-	register_kprobe(&trampoline_p);
-	return 0;
-}