1 files changed, 0 insertions, 459 deletions

diff --git a/arch/ppc64/kernel/kprobes.c b/arch/ppc64/kernel/kprobes.c
deleted file mode 100644
index 511af54e623..00000000000
--- a/arch/ppc64/kernel/kprobes.c
+++ /dev/null
@@ -1,459 +0,0 @@
-/*
- *  Kernel Probes (KProbes)
- *  arch/ppc64/kernel/kprobes.c
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (C) IBM Corporation, 2002, 2004
- *
- * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
- *		Probes initial implementation ( includes contributions from
- *		Rusty Russell).
- * 2004-July	Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
- *		interface to access function arguments.
- * 2004-Nov	Ananth N Mavinakayanahalli <ananth@in.ibm.com> kprobes port
- *		for PPC64
- */
-
-#include <linux/config.h>
-#include <linux/kprobes.h>
-#include <linux/ptrace.h>
-#include <linux/preempt.h>
-#include <asm/cacheflush.h>
-#include <asm/kdebug.h>
-#include <asm/sstep.h>
-
-static DECLARE_MUTEX(kprobe_mutex);
-DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
-DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
-
-int __kprobes arch_prepare_kprobe(struct kprobe *p)
-{
-	int ret = 0;
-	kprobe_opcode_t insn = *p->addr;
-
-	if ((unsigned long)p->addr & 0x03) {
-		printk("Attempt to register kprobe at an unaligned address\n");
-		ret = -EINVAL;
-	} else if (IS_MTMSRD(insn) || IS_RFID(insn)) {
-		printk("Cannot register a kprobe on rfid or mtmsrd\n");
-		ret = -EINVAL;
-	}
-
-	/* insn must be on a special executable page on ppc64 */
-	if (!ret) {
-		down(&kprobe_mutex);
-		p->ainsn.insn = get_insn_slot();
-		up(&kprobe_mutex);
-		if (!p->ainsn.insn)
-			ret = -ENOMEM;
-	}
-	return ret;
-}
-
-void __kprobes arch_copy_kprobe(struct kprobe *p)
-{
-	memcpy(p->ainsn.insn, p->addr, MAX_INSN_SIZE * sizeof(kprobe_opcode_t));
-	p->opcode = *p->addr;
-}
-
-void __kprobes arch_arm_kprobe(struct kprobe *p)
-{
-	*p->addr = BREAKPOINT_INSTRUCTION;
-	flush_icache_range((unsigned long) p->addr,
-			   (unsigned long) p->addr + sizeof(kprobe_opcode_t));
-}
-
-void __kprobes arch_disarm_kprobe(struct kprobe *p)
-{
-	*p->addr = p->opcode;
-	flush_icache_range((unsigned long) p->addr,
-			   (unsigned long) p->addr + sizeof(kprobe_opcode_t));
-}
-
-void __kprobes arch_remove_kprobe(struct kprobe *p)
-{
-	down(&kprobe_mutex);
-	free_insn_slot(p->ainsn.insn);
-	up(&kprobe_mutex);
-}
-
-static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
-{
-	kprobe_opcode_t insn = *p->ainsn.insn;
-
-	regs->msr |= MSR_SE;
-
-	/* single step inline if it is a trap variant */
-	if (is_trap(insn))
-		regs->nip = (unsigned long)p->addr;
-	else
-		regs->nip = (unsigned long)p->ainsn.insn;
-}
-
-static inline void save_previous_kprobe(struct kprobe_ctlblk *kcb)
-{
-	kcb->prev_kprobe.kp = kprobe_running();
-	kcb->prev_kprobe.status = kcb->kprobe_status;
-	kcb->prev_kprobe.saved_msr = kcb->kprobe_saved_msr;
-}
-
-static inline void restore_previous_kprobe(struct kprobe_ctlblk *kcb)
-{
-	__get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
-	kcb->kprobe_status = kcb->prev_kprobe.status;
-	kcb->kprobe_saved_msr = kcb->prev_kprobe.saved_msr;
-}
-
-static inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
-				struct kprobe_ctlblk *kcb)
-{
-	__get_cpu_var(current_kprobe) = p;
-	kcb->kprobe_saved_msr = regs->msr;
-}
-
-/* Called with kretprobe_lock held */
-void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
-				      struct pt_regs *regs)
-{
-	struct kretprobe_instance *ri;
-
-	if ((ri = get_free_rp_inst(rp)) != NULL) {
-		ri->rp = rp;
-		ri->task = current;
-		ri->ret_addr = (kprobe_opcode_t *)regs->link;
-
-		/* Replace the return addr with trampoline addr */
-		regs->link = (unsigned long)kretprobe_trampoline;
-		add_rp_inst(ri);
-	} else {
-		rp->nmissed++;
-	}
-}
-
-static inline int kprobe_handler(struct pt_regs *regs)
-{
-	struct kprobe *p;
-	int ret = 0;
-	unsigned int *addr = (unsigned int *)regs->nip;
-	struct kprobe_ctlblk *kcb;
-
-	/*
-	 * 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) {
-			kprobe_opcode_t insn = *p->ainsn.insn;
-			if (kcb->kprobe_status == KPROBE_HIT_SS &&
-					is_trap(insn)) {
-				regs->msr &= ~MSR_SE;
-				regs->msr |= kcb->kprobe_saved_msr;
-				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);
-			kcb->kprobe_saved_msr = regs->msr;
-			p->nmissed++;
-			prepare_singlestep(p, regs);
-			kcb->kprobe_status = KPROBE_REENTER;
-			return 1;
-		} else {
-			p = __get_cpu_var(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_INSTRUCTION) {
-			/*
-			 * PowerPC has multiple variants of the "trap"
-			 * instruction. If the current instruction is a
-			 * trap variant, it could belong to someone else
-			 */
-			kprobe_opcode_t cur_insn = *addr;
-			if (is_trap(cur_insn))
-		       		goto no_kprobe;
-			/*
-			 * 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;
-	}
-
-	kcb->kprobe_status = KPROBE_HIT_ACTIVE;
-	set_current_kprobe(p, regs, kcb);
-	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;
-}
-
-/*
- * Function return probe trampoline:
- * 	- init_kprobes() establishes a probepoint here
- * 	- When the probed function returns, this probe
- * 		causes the handlers to fire
- */
-void kretprobe_trampoline_holder(void)
-{
-	asm volatile(".global kretprobe_trampoline\n"
-			"kretprobe_trampoline:\n"
-			"nop\n");
-}
-
-/*
- * Called when the probe at kretprobe trampoline is hit
- */
-int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
-{
-        struct kretprobe_instance *ri = NULL;
-        struct hlist_head *head;
-        struct hlist_node *node, *tmp;
-	unsigned long flags, orig_ret_address = 0;
-	unsigned long trampoline_address =(unsigned long)&kretprobe_trampoline;
-
-	spin_lock_irqsave(&kretprobe_lock, flags);
-        head = kretprobe_inst_table_head(current);
-
-	/*
-	 * It is possible to have multiple instances associated with a given
-	 * task either because an multiple functions in the call path
-	 * have a return probe installed on them, and/or more then 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, node, 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);
-
-		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;
-	}
-
-	BUG_ON(!orig_ret_address || (orig_ret_address == trampoline_address));
-	regs->nip = orig_ret_address;
-
-	reset_current_kprobe();
-	spin_unlock_irqrestore(&kretprobe_lock, flags);
-	preempt_enable_no_resched();
-
-        /*
-         * 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;
-}
-
-/*
- * Called after single-stepping.  p->addr is the address of the
- * instruction whose first byte has been replaced by the "breakpoint"
- * instruction.  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.
- */
-static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
-{
-	int ret;
-	unsigned int insn = *p->ainsn.insn;
-
-	regs->nip = (unsigned long)p->addr;
-	ret = emulate_step(regs, insn);
-	if (ret == 0)
-		regs->nip = (unsigned long)p->addr + 4;
-}
-
-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);
-	regs->msr |= kcb->kprobe_saved_msr;
-
-	/*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();
-
-	/*
-	 * if somebody else is singlestepping across a probe point, msr
-	 * will have SE set, in which case, continue the remaining processing
-	 * of do_debug, as if this is not a probe hit.
-	 */
-	if (regs->msr & MSR_SE)
-		return 0;
-
-	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) {
-		resume_execution(cur, regs);
-		regs->msr &= ~MSR_SE;
-		regs->msr |= kcb->kprobe_saved_msr;
-
-		reset_current_kprobe();
-		preempt_enable_no_resched();
-	}
-	return 0;
-}
-
-/*
- * Wrapper routine to 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_BPT:
-		if (kprobe_handler(args->regs))
-			ret = NOTIFY_STOP;
-		break;
-	case DIE_SSTEP:
-		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();
-
-	memcpy(&kcb->jprobe_saved_regs, regs, sizeof(struct pt_regs));
-
-	/* setup return addr to the jprobe handler routine */
-	regs->nip = (unsigned long)(((func_descr_t *)jp->entry)->entry);
-	regs->gpr[2] = (unsigned long)(((func_descr_t *)jp->entry)->toc);
-
-	return 1;
-}
-
-void __kprobes jprobe_return(void)
-{
-	asm volatile("trap" ::: "memory");
-}
-
-void __kprobes jprobe_return_end(void)
-{
-};
-
-int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
-{
-	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
-
-	/*
-	 * FIXME - we should ideally be validating that we got here 'cos
-	 * of the "trap" in jprobe_return() above, before restoring the
-	 * saved regs...
-	 */
-	memcpy(regs, &kcb->jprobe_saved_regs, sizeof(struct pt_regs));
-	preempt_enable_no_resched();
-	return 1;
-}
-
-static struct kprobe trampoline_p = {
-	.addr = (kprobe_opcode_t *) &kretprobe_trampoline,
-	.pre_handler = trampoline_probe_handler
-};
-
-int __init arch_init_kprobes(void)
-{
-	return register_kprobe(&trampoline_p);
-}