1 files changed, 0 insertions, 443 deletions

diff --git a/arch/sparc64/kernel/kprobes.c b/arch/sparc64/kernel/kprobes.c
deleted file mode 100644
index b9a9ce70e55..00000000000
--- a/arch/sparc64/kernel/kprobes.c
+++ /dev/null
@@ -1,443 +0,0 @@
-/* arch/sparc64/kernel/kprobes.c
- *
- * Copyright (C) 2004 David S. Miller <davem@davemloft.net>
- */
-
-#include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/kprobes.h>
-#include <asm/kdebug.h>
-#include <asm/signal.h>
-#include <asm/cacheflush.h>
-
-/* We do not have hardware single-stepping on sparc64.
- * So we implement software single-stepping with breakpoint
- * traps.  The top-level scheme is similar to that used
- * in the x86 kprobes implementation.
- *
- * In the kprobe->ainsn.insn[] array we store the original
- * instruction at index zero and a break instruction at
- * index one.
- *
- * When we hit a kprobe we:
- * - Run the pre-handler
- * - Remember "regs->tnpc" and interrupt level stored in
- *   "regs->tstate" so we can restore them later
- * - Disable PIL interrupts
- * - Set regs->tpc to point to kprobe->ainsn.insn[0]
- * - Set regs->tnpc to point to kprobe->ainsn.insn[1]
- * - Mark that we are actively in a kprobe
- *
- * At this point we wait for the second breakpoint at
- * kprobe->ainsn.insn[1] to hit.  When it does we:
- * - Run the post-handler
- * - Set regs->tpc to "remembered" regs->tnpc stored above,
- *   restore the PIL interrupt level in "regs->tstate" as well
- * - Make any adjustments necessary to regs->tnpc in order
- *   to handle relative branches correctly.  See below.
- * - Mark that we are no longer actively in a kprobe.
- */
-
-DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
-DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
-
-int __kprobes arch_prepare_kprobe(struct kprobe *p)
-{
-	p->ainsn.insn[0] = *p->addr;
-	p->ainsn.insn[1] = BREAKPOINT_INSTRUCTION_2;
-	p->opcode = *p->addr;
-	return 0;
-}
-
-void __kprobes arch_arm_kprobe(struct kprobe *p)
-{
-	*p->addr = BREAKPOINT_INSTRUCTION;
-	flushi(p->addr);
-}
-
-void __kprobes arch_disarm_kprobe(struct kprobe *p)
-{
-	*p->addr = p->opcode;
-	flushi(p->addr);
-}
-
-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.orig_tnpc = kcb->kprobe_orig_tnpc;
-	kcb->prev_kprobe.orig_tstate_pil = kcb->kprobe_orig_tstate_pil;
-}
-
-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_orig_tnpc = kcb->prev_kprobe.orig_tnpc;
-	kcb->kprobe_orig_tstate_pil = kcb->prev_kprobe.orig_tstate_pil;
-}
-
-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_orig_tnpc = regs->tnpc;
-	kcb->kprobe_orig_tstate_pil = (regs->tstate & TSTATE_PIL);
-}
-
-static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs,
-			struct kprobe_ctlblk *kcb)
-{
-	regs->tstate |= TSTATE_PIL;
-
-	/*single step inline, if it a breakpoint instruction*/
-	if (p->opcode == BREAKPOINT_INSTRUCTION) {
-		regs->tpc = (unsigned long) p->addr;
-		regs->tnpc = kcb->kprobe_orig_tnpc;
-	} else {
-		regs->tpc = (unsigned long) &p->ainsn.insn[0];
-		regs->tnpc = (unsigned long) &p->ainsn.insn[1];
-	}
-}
-
-static int __kprobes kprobe_handler(struct pt_regs *regs)
-{
-	struct kprobe *p;
-	void *addr = (void *) regs->tpc;
-	int ret = 0;
-	struct kprobe_ctlblk *kcb;
-
-	/*
-	 * We don't want to be preempted for the entire
-	 * duration of kprobe processing
-	 */
-	preempt_disable();
-	kcb = get_kprobe_ctlblk();
-
-	if (kprobe_running()) {
-		p = get_kprobe(addr);
-		if (p) {
-			if (kcb->kprobe_status == KPROBE_HIT_SS) {
-				regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
-					kcb->kprobe_orig_tstate_pil);
-				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);
-			kcb->kprobe_status = KPROBE_REENTER;
-			prepare_singlestep(p, regs, kcb);
-			return 1;
-		} else {
-			if (*(u32 *)addr != BREAKPOINT_INSTRUCTION) {
-			/* 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 = __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 (*(u32 *)addr != BREAKPOINT_INSTRUCTION) {
-			/*
-			 * 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))
-		return 1;
-
-ss_probe:
-	prepare_singlestep(p, regs, kcb);
-	kcb->kprobe_status = KPROBE_HIT_SS;
-	return 1;
-
-no_kprobe:
-	preempt_enable_no_resched();
-	return ret;
-}
-
-/* If INSN is a relative control transfer instruction,
- * return the corrected branch destination value.
- *
- * The original INSN location was REAL_PC, it actually
- * executed at PC and produced destination address NPC.
- */
-static unsigned long __kprobes relbranch_fixup(u32 insn, unsigned long real_pc,
-					       unsigned long pc,
-					       unsigned long npc)
-{
-	/* Branch not taken, no mods necessary.  */
-	if (npc == pc + 0x4UL)
-		return real_pc + 0x4UL;
-
-	/* The three cases are call, branch w/prediction,
-	 * and traditional branch.
-	 */
-	if ((insn & 0xc0000000) == 0x40000000 ||
-	    (insn & 0xc1c00000) == 0x00400000 ||
-	    (insn & 0xc1c00000) == 0x00800000) {
-		/* The instruction did all the work for us
-		 * already, just apply the offset to the correct
-		 * instruction location.
-		 */
-		return (real_pc + (npc - pc));
-	}
-
-	return real_pc + 0x4UL;
-}
-
-/* If INSN is an instruction which writes it's PC location
- * into a destination register, fix that up.
- */
-static void __kprobes retpc_fixup(struct pt_regs *regs, u32 insn,
-				  unsigned long real_pc)
-{
-	unsigned long *slot = NULL;
-
-	/* Simplest cast is call, which always uses %o7 */
-	if ((insn & 0xc0000000) == 0x40000000) {
-		slot = &regs->u_regs[UREG_I7];
-	}
-
-	/* Jmpl encodes the register inside of the opcode */
-	if ((insn & 0xc1f80000) == 0x81c00000) {
-		unsigned long rd = ((insn >> 25) & 0x1f);
-
-		if (rd <= 15) {
-			slot = &regs->u_regs[rd];
-		} else {
-			/* Hard case, it goes onto the stack. */
-			flushw_all();
-
-			rd -= 16;
-			slot = (unsigned long *)
-				(regs->u_regs[UREG_FP] + STACK_BIAS);
-			slot += rd;
-		}
-	}
-	if (slot != NULL)
-		*slot = real_pc;
-}
-
-/*
- * 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.
- *
- * 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)
-{
-	u32 insn = p->ainsn.insn[0];
-
-	regs->tpc = kcb->kprobe_orig_tnpc;
-	regs->tnpc = relbranch_fixup(insn,
-				     (unsigned long) p->addr,
-				     (unsigned long) &p->ainsn.insn[0],
-				     regs->tnpc);
-	retpc_fixup(regs, insn, (unsigned long) p->addr);
-
-	regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
-			kcb->kprobe_orig_tstate_pil);
-}
-
-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) {
-		resume_execution(cur, regs, kcb);
-
-		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_DEBUG:
-		if (kprobe_handler(args->regs))
-			ret = NOTIFY_STOP;
-		break;
-	case DIE_DEBUG_2:
-		if (post_kprobe_handler(args->regs))
-			ret = NOTIFY_STOP;
-		break;
-	case DIE_GPF:
-	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;
-}
-
-asmlinkage void __kprobes kprobe_trap(unsigned long trap_level,
-				      struct pt_regs *regs)
-{
-	BUG_ON(trap_level != 0x170 && trap_level != 0x171);
-
-	if (user_mode(regs)) {
-		local_irq_enable();
-		bad_trap(regs, trap_level);
-		return;
-	}
-
-	/* trap_level == 0x170 --> ta 0x70
-	 * trap_level == 0x171 --> ta 0x71
-	 */
-	if (notify_die((trap_level == 0x170) ? DIE_DEBUG : DIE_DEBUG_2,
-		       (trap_level == 0x170) ? "debug" : "debug_2",
-		       regs, 0, trap_level, SIGTRAP) != NOTIFY_STOP)
-		bad_trap(regs, trap_level);
-}
-
-/* Jprobes support.  */
-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_location = regs;
-	memcpy(&(kcb->jprobe_saved_regs), regs, sizeof(*regs));
-
-	/* Save a whole stack frame, this gets arguments
-	 * pushed onto the stack after using up all the
-	 * arg registers.
-	 */
-	memcpy(&(kcb->jprobe_saved_stack),
-	       (char *) (regs->u_regs[UREG_FP] + STACK_BIAS),
-	       sizeof(kcb->jprobe_saved_stack));
-
-	regs->tpc  = (unsigned long) jp->entry;
-	regs->tnpc = ((unsigned long) jp->entry) + 0x4UL;
-	regs->tstate |= TSTATE_PIL;
-
-	return 1;
-}
-
-void __kprobes jprobe_return(void)
-{
-	__asm__ __volatile__(
-		".globl	jprobe_return_trap_instruction\n"
-"jprobe_return_trap_instruction:\n\t"
-		"ta 0x70");
-}
-
-extern void jprobe_return_trap_instruction(void);
-
-extern void __show_regs(struct pt_regs * regs);
-
-int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
-{
-	u32 *addr = (u32 *) regs->tpc;
-	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
-
-	if (addr == (u32 *) jprobe_return_trap_instruction) {
-		if (kcb->jprobe_saved_regs_location != regs) {
-			printk("JPROBE: Current regs (%p) does not match "
-			       "saved regs (%p).\n",
-			       regs, kcb->jprobe_saved_regs_location);
-			printk("JPROBE: Saved registers\n");
-			__show_regs(kcb->jprobe_saved_regs_location);
-			printk("JPROBE: Current registers\n");
-			__show_regs(regs);
-			BUG();
-		}
-		/* Restore old register state.  Do pt_regs
-		 * first so that UREG_FP is the original one for
-		 * the stack frame restore.
-		 */
-		memcpy(regs, &(kcb->jprobe_saved_regs), sizeof(*regs));
-
-		memcpy((char *) (regs->u_regs[UREG_FP] + STACK_BIAS),
-		       &(kcb->jprobe_saved_stack),
-		       sizeof(kcb->jprobe_saved_stack));
-
-		preempt_enable_no_resched();
-		return 1;
-	}
-	return 0;
-}
-
-/* architecture specific initialization */
-int arch_init_kprobes(void)
-{
-	return 0;
-}