arch: Remove Itanium (IA-64) architecture

The Itanium architecture is obsolete, and an informal survey [0] reveals
that any residual use of Itanium hardware in production is mostly HP-UX
or OpenVMS based. The use of Linux on Itanium appears to be limited to
enthusiasts that occasionally boot a fresh Linux kernel to see whether
things are still working as intended, and perhaps to churn out some
distro packages that are rarely used in practice.

None of the original companies behind Itanium still produce or support
any hardware or software for the architecture, and it is listed as
'Orphaned' in the MAINTAINERS file, as apparently, none of the engineers
that contributed on behalf of those companies (nor anyone else, for that
matter) have been willing to support or maintain the architecture
upstream or even be responsible for applying the odd fix. The Intel
firmware team removed all IA-64 support from the Tianocore/EDK2
reference implementation of EFI in 2018. (Itanium is the original
architecture for which EFI was developed, and the way Linux supports it
deviates significantly from other architectures.) Some distros, such as
Debian and Gentoo, still maintain [unofficial] ia64 ports, but many have
dropped support years ago.

While the argument is being made [1] that there is a 'for the common
good' angle to being able to build and run existing projects such as the
Grid Community Toolkit [2] on Itanium for interoperability testing, the
fact remains that none of those projects are known to be deployed on
Linux/ia64, and very few people actually have access to such a system in
the first place. Even if there were ways imaginable in which Linux/ia64
could be put to good use today, what matters is whether anyone is
actually doing that, and this does not appear to be the case.

There are no emulators widely available, and so boot testing Itanium is
generally infeasible for ordinary contributors. GCC still supports IA-64
but its compile farm [3] no longer has any IA-64 machines. GLIBC would
like to get rid of IA-64 [4] too because it would permit some overdue
code cleanups. In summary, the benefits to the ecosystem of having IA-64
be part of it are mostly theoretical, whereas the maintenance overhead
of keeping it supported is real.

So let's rip off the band aid, and remove the IA-64 arch code entirely.
This follows the timeline proposed by the Debian/ia64 maintainer [5],
which removes support in a controlled manner, leaving IA-64 in a known
good state in the most recent LTS release. Other projects will follow
once the kernel support is removed.

[0] https://lore.kernel.org/all/CAMj1kXFCMh_578jniKpUtx_j8ByHnt=s7S+yQ+vGbKt9ud7+kQ@mail.gmail.com/
[1] https://lore.kernel.org/all/0075883c-7c51-00f5-2c2d-5119c1820410@web.de/
[2] https://gridcf.org/gct-docs/latest/index.html
[3] https://cfarm.tetaneutral.net/machines/list/
[4] https://lore.kernel.org/all/87bkiilpc4.fsf@mid.deneb.enyo.de/
[5] https://lore.kernel.org/all/ff58a3e76e5102c94bb5946d99187b358def688a.camel@physik.fu-berlin.de/

Acked-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

1 files changed, 0 insertions, 911 deletions

diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
deleted file mode 100644
index ca34e51e84b4..000000000000
--- a/arch/ia64/kernel/kprobes.c
+++ /dev/null
@@ -1,911 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- *  Kernel Probes (KProbes)
- *  arch/ia64/kernel/kprobes.c
- *
- * Copyright (C) IBM Corporation, 2002, 2004
- * Copyright (C) Intel Corporation, 2005
- *
- * 2005-Apr     Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
- *              <anil.s.keshavamurthy@intel.com> adapted from i386
- */
-
-#include <linux/kprobes.h>
-#include <linux/ptrace.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/preempt.h>
-#include <linux/extable.h>
-#include <linux/kdebug.h>
-#include <linux/pgtable.h>
-
-#include <asm/sections.h>
-#include <asm/exception.h>
-
-DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
-DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
-
-struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}};
-
-enum instruction_type {A, I, M, F, B, L, X, u};
-static enum instruction_type bundle_encoding[32][3] = {
-	[0x00] = { M, I, I },
-	[0x01] = { M, I, I },
-	[0x02] = { M, I, I },
-	[0x03] = { M, I, I },
-	[0x04] = { M, L, X },
-	[0x05] = { M, L, X },
-	[0x06] = { u, u, u },
-	[0x07] = { u, u, u },
-	[0x08] = { M, M, I },
-	[0x09] = { M, M, I },
-	[0x0A] = { M, M, I },
-	[0x0B] = { M, M, I },
-	[0x0C] = { M, F, I },
-	[0x0D] = { M, F, I },
-	[0x0E] = { M, M, F },
-	[0x0F] = { M, M, F },
-	[0x10] = { M, I, B },
-	[0x11] = { M, I, B },
-	[0x12] = { M, B, B },
-	[0x13] = { M, B, B },
-	[0x14] = { u, u, u },
-	[0x15] = { u, u, u },
-	[0x16] = { B, B, B },
-	[0x17] = { B, B, B },
-	[0x18] = { M, M, B },
-	[0x19] = { M, M, B },
-	[0x1A] = { u, u, u },
-	[0x1B] = { u, u, u },
-	[0x1C] = { M, F, B },
-	[0x1D] = { M, F, B },
-	[0x1E] = { u, u, u },
-	[0x1F] = { u, u, u },
-};
-
-/* Insert a long branch code */
-static void __kprobes set_brl_inst(void *from, void *to)
-{
-	s64 rel = ((s64) to - (s64) from) >> 4;
-	bundle_t *brl;
-	brl = (bundle_t *) ((u64) from & ~0xf);
-	brl->quad0.template = 0x05;	/* [MLX](stop) */
-	brl->quad0.slot0 = NOP_M_INST;	/* nop.m 0x0 */
-	brl->quad0.slot1_p0 = ((rel >> 20) & 0x7fffffffff) << 2;
-	brl->quad1.slot1_p1 = (((rel >> 20) & 0x7fffffffff) << 2) >> (64 - 46);
-	/* brl.cond.sptk.many.clr rel<<4 (qp=0) */
-	brl->quad1.slot2 = BRL_INST(rel >> 59, rel & 0xfffff);
-}
-
-/*
- * In this function we check to see if the instruction
- * is IP relative instruction and update the kprobe
- * inst flag accordingly
- */
-static void __kprobes update_kprobe_inst_flag(uint template, uint  slot,
-					      uint major_opcode,
-					      unsigned long kprobe_inst,
-					      struct kprobe *p)
-{
-	p->ainsn.inst_flag = 0;
-	p->ainsn.target_br_reg = 0;
-	p->ainsn.slot = slot;
-
-	/* Check for Break instruction
-	 * Bits 37:40 Major opcode to be zero
-	 * Bits 27:32 X6 to be zero
-	 * Bits 32:35 X3 to be zero
-	 */
-	if ((!major_opcode) && (!((kprobe_inst >> 27) & 0x1FF)) ) {
-		/* is a break instruction */
-	 	p->ainsn.inst_flag |= INST_FLAG_BREAK_INST;
-		return;
-	}
-
-	if (bundle_encoding[template][slot] == B) {
-		switch (major_opcode) {
-		  case INDIRECT_CALL_OPCODE:
-	 		p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG;
-			p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7);
-			break;
-		  case IP_RELATIVE_PREDICT_OPCODE:
-		  case IP_RELATIVE_BRANCH_OPCODE:
-			p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR;
-			break;
-		  case IP_RELATIVE_CALL_OPCODE:
-			p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR;
-			p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG;
-			p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7);
-			break;
-		}
-	} else if (bundle_encoding[template][slot] == X) {
-		switch (major_opcode) {
-		  case LONG_CALL_OPCODE:
-			p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG;
-			p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7);
-		  break;
-		}
-	}
-	return;
-}
-
-/*
- * In this function we check to see if the instruction
- * (qp) cmpx.crel.ctype p1,p2=r2,r3
- * on which we are inserting kprobe is cmp instruction
- * with ctype as unc.
- */
-static uint __kprobes is_cmp_ctype_unc_inst(uint template, uint slot,
-					    uint major_opcode,
-					    unsigned long kprobe_inst)
-{
-	cmp_inst_t cmp_inst;
-	uint ctype_unc = 0;
-
-	if (!((bundle_encoding[template][slot] == I) ||
-		(bundle_encoding[template][slot] == M)))
-		goto out;
-
-	if (!((major_opcode == 0xC) || (major_opcode == 0xD) ||
-		(major_opcode == 0xE)))
-		goto out;
-
-	cmp_inst.l = kprobe_inst;
-	if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) {
-		/* Integer compare - Register Register (A6 type)*/
-		if ((cmp_inst.f.tb == 0) && (cmp_inst.f.ta == 0)
-				&&(cmp_inst.f.c == 1))
-			ctype_unc = 1;
-	} else if ((cmp_inst.f.x2 == 2)||(cmp_inst.f.x2 == 3)) {
-		/* Integer compare - Immediate Register (A8 type)*/
-		if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1))
-			ctype_unc = 1;
-	}
-out:
-	return ctype_unc;
-}
-
-/*
- * In this function we check to see if the instruction
- * on which we are inserting kprobe is supported.
- * Returns qp value if supported
- * Returns -EINVAL if unsupported
- */
-static int __kprobes unsupported_inst(uint template, uint  slot,
-				      uint major_opcode,
-				      unsigned long kprobe_inst,
-				      unsigned long addr)
-{
-	int qp;
-
-	qp = kprobe_inst & 0x3f;
-	if (is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst)) {
-		if (slot == 1 && qp)  {
-			printk(KERN_WARNING "Kprobes on cmp unc "
-					"instruction on slot 1 at <0x%lx> "
-					"is not supported\n", addr);
-			return -EINVAL;
-
-		}
-		qp = 0;
-	}
-	else if (bundle_encoding[template][slot] == I) {
-		if (major_opcode == 0) {
-			/*
-			 * Check for Integer speculation instruction
-			 * - Bit 33-35 to be equal to 0x1
-			 */
-			if (((kprobe_inst >> 33) & 0x7) == 1) {
-				printk(KERN_WARNING
-					"Kprobes on speculation inst at <0x%lx> not supported\n",
-						addr);
-				return -EINVAL;
-			}
-			/*
-			 * IP relative mov instruction
-			 *  - Bit 27-35 to be equal to 0x30
-			 */
-			if (((kprobe_inst >> 27) & 0x1FF) == 0x30) {
-				printk(KERN_WARNING
-					"Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n",
-						addr);
-				return -EINVAL;
-
-			}
-		}
-		else if ((major_opcode == 5) &&	!(kprobe_inst & (0xFUl << 33)) &&
-				(kprobe_inst & (0x1UL << 12))) {
-			/* test bit instructions, tbit,tnat,tf
-			 * bit 33-36 to be equal to 0
-			 * bit 12 to be equal to 1
-			 */
-			if (slot == 1 && qp) {
-				printk(KERN_WARNING "Kprobes on test bit "
-						"instruction on slot at <0x%lx> "
-						"is not supported\n", addr);
-				return -EINVAL;
-			}
-			qp = 0;
-		}
-	}
-	else if (bundle_encoding[template][slot] == B) {
-		if (major_opcode == 7) {
-			/* IP-Relative Predict major code is 7 */
-			printk(KERN_WARNING "Kprobes on IP-Relative"
-					"Predict is not supported\n");
-			return -EINVAL;
-		}
-		else if (major_opcode == 2) {
-			/* Indirect Predict, major code is 2
-			 * bit 27-32 to be equal to 10 or 11
-			 */
-			int x6=(kprobe_inst >> 27) & 0x3F;
-			if ((x6 == 0x10) || (x6 == 0x11)) {
-				printk(KERN_WARNING "Kprobes on "
-					"Indirect Predict is not supported\n");
-				return -EINVAL;
-			}
-		}
-	}
-	/* kernel does not use float instruction, here for safety kprobe
-	 * will judge whether it is fcmp/flass/float approximation instruction
-	 */
-	else if (unlikely(bundle_encoding[template][slot] == F)) {
-		if ((major_opcode == 4 || major_opcode == 5) &&
-				(kprobe_inst  & (0x1 << 12))) {
-			/* fcmp/fclass unc instruction */
-			if (slot == 1 && qp) {
-				printk(KERN_WARNING "Kprobes on fcmp/fclass "
-					"instruction on slot at <0x%lx> "
-					"is not supported\n", addr);
-				return -EINVAL;
-
-			}
-			qp = 0;
-		}
-		if ((major_opcode == 0 || major_opcode == 1) &&
-			(kprobe_inst & (0x1UL << 33))) {
-			/* float Approximation instruction */
-			if (slot == 1 && qp) {
-				printk(KERN_WARNING "Kprobes on float Approx "
-					"instr at <0x%lx> is not supported\n",
-						addr);
-				return -EINVAL;
-			}
-			qp = 0;
-		}
-	}
-	return qp;
-}
-
-/*
- * In this function we override the bundle with
- * the break instruction at the given slot.
- */
-static void __kprobes prepare_break_inst(uint template, uint  slot,
-					 uint major_opcode,
-					 unsigned long kprobe_inst,
-					 struct kprobe *p,
-					 int qp)
-{
-	unsigned long break_inst = BREAK_INST;
-	bundle_t *bundle = &p->opcode.bundle;
-
-	/*
-	 * Copy the original kprobe_inst qualifying predicate(qp)
-	 * to the break instruction
-	 */
-	break_inst |= qp;
-
-	switch (slot) {
-	  case 0:
-		bundle->quad0.slot0 = break_inst;
-		break;
-	  case 1:
-		bundle->quad0.slot1_p0 = break_inst;
-		bundle->quad1.slot1_p1 = break_inst >> (64-46);
-		break;
-	  case 2:
-		bundle->quad1.slot2 = break_inst;
-		break;
-	}
-
-	/*
-	 * Update the instruction flag, so that we can
-	 * emulate the instruction properly after we
-	 * single step on original instruction
-	 */
-	update_kprobe_inst_flag(template, slot, major_opcode, kprobe_inst, p);
-}
-
-static void __kprobes get_kprobe_inst(bundle_t *bundle, uint slot,
-	       	unsigned long *kprobe_inst, uint *major_opcode)
-{
-	unsigned long kprobe_inst_p0, kprobe_inst_p1;
-	unsigned int template;
-
-	template = bundle->quad0.template;
-
-	switch (slot) {
-	  case 0:
-		*major_opcode = (bundle->quad0.slot0 >> SLOT0_OPCODE_SHIFT);
-		*kprobe_inst = bundle->quad0.slot0;
-		  break;
-	  case 1:
-		*major_opcode = (bundle->quad1.slot1_p1 >> SLOT1_p1_OPCODE_SHIFT);
-		kprobe_inst_p0 = bundle->quad0.slot1_p0;
-		kprobe_inst_p1 = bundle->quad1.slot1_p1;
-		*kprobe_inst = kprobe_inst_p0 | (kprobe_inst_p1 << (64-46));
-		break;
-	  case 2:
-		*major_opcode = (bundle->quad1.slot2 >> SLOT2_OPCODE_SHIFT);
-		*kprobe_inst = bundle->quad1.slot2;
-		break;
-	}
-}
-
-/* Returns non-zero if the addr is in the Interrupt Vector Table */
-static int __kprobes in_ivt_functions(unsigned long addr)
-{
-	return (addr >= (unsigned long)__start_ivt_text
-		&& addr < (unsigned long)__end_ivt_text);
-}
-
-static int __kprobes valid_kprobe_addr(int template, int slot,
-				       unsigned long addr)
-{
-	if ((slot > 2) || ((bundle_encoding[template][1] == L) && slot > 1)) {
-		printk(KERN_WARNING "Attempting to insert unaligned kprobe "
-				"at 0x%lx\n", addr);
-		return -EINVAL;
-	}
-
-	if (in_ivt_functions(addr)) {
-		printk(KERN_WARNING "Kprobes can't be inserted inside "
-				"IVT functions at 0x%lx\n", addr);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
-{
-	unsigned int i;
-	i = atomic_add_return(1, &kcb->prev_kprobe_index);
-	kcb->prev_kprobe[i-1].kp = kprobe_running();
-	kcb->prev_kprobe[i-1].status = kcb->kprobe_status;
-}
-
-static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
-{
-	unsigned int i;
-	i = atomic_read(&kcb->prev_kprobe_index);
-	__this_cpu_write(current_kprobe, kcb->prev_kprobe[i-1].kp);
-	kcb->kprobe_status = kcb->prev_kprobe[i-1].status;
-	atomic_sub(1, &kcb->prev_kprobe_index);
-}
-
-static void __kprobes set_current_kprobe(struct kprobe *p,
-			struct kprobe_ctlblk *kcb)
-{
-	__this_cpu_write(current_kprobe, p);
-}
-
-void __kretprobe_trampoline(void)
-{
-}
-
-int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
-{
-	regs->cr_iip = __kretprobe_trampoline_handler(regs, NULL);
-	/*
-	 * 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;
-}
-
-void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
-				      struct pt_regs *regs)
-{
-	ri->ret_addr = (kprobe_opcode_t *)regs->b0;
-	ri->fp = NULL;
-
-	/* Replace the return addr with trampoline addr */
-	regs->b0 = (unsigned long)dereference_function_descriptor(__kretprobe_trampoline);
-}
-
-/* Check the instruction in the slot is break */
-static int __kprobes __is_ia64_break_inst(bundle_t *bundle, uint slot)
-{
-	unsigned int major_opcode;
-	unsigned int template = bundle->quad0.template;
-	unsigned long kprobe_inst;
-
-	/* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */
-	if (slot == 1 && bundle_encoding[template][1] == L)
-		slot++;
-
-	/* Get Kprobe probe instruction at given slot*/
-	get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode);
-
-	/* For break instruction,
-	 * Bits 37:40 Major opcode to be zero
-	 * Bits 27:32 X6 to be zero
-	 * Bits 32:35 X3 to be zero
-	 */
-	if (major_opcode || ((kprobe_inst >> 27) & 0x1FF)) {
-		/* Not a break instruction */
-		return 0;
-	}
-
-	/* Is a break instruction */
-	return 1;
-}
-
-/*
- * In this function, we check whether the target bundle modifies IP or
- * it triggers an exception. If so, it cannot be boostable.
- */
-static int __kprobes can_boost(bundle_t *bundle, uint slot,
-			       unsigned long bundle_addr)
-{
-	unsigned int template = bundle->quad0.template;
-
-	do {
-		if (search_exception_tables(bundle_addr + slot) ||
-		    __is_ia64_break_inst(bundle, slot))
-			return 0;	/* exception may occur in this bundle*/
-	} while ((++slot) < 3);
-	template &= 0x1e;
-	if (template >= 0x10 /* including B unit */ ||
-	    template == 0x04 /* including X unit */ ||
-	    template == 0x06) /* undefined */
-		return 0;
-
-	return 1;
-}
-
-/* Prepare long jump bundle and disables other boosters if need */
-static void __kprobes prepare_booster(struct kprobe *p)
-{
-	unsigned long addr = (unsigned long)p->addr & ~0xFULL;
-	unsigned int slot = (unsigned long)p->addr & 0xf;
-	struct kprobe *other_kp;
-
-	if (can_boost(&p->ainsn.insn[0].bundle, slot, addr)) {
-		set_brl_inst(&p->ainsn.insn[1].bundle, (bundle_t *)addr + 1);
-		p->ainsn.inst_flag |= INST_FLAG_BOOSTABLE;
-	}
-
-	/* disables boosters in previous slots */
-	for (; addr < (unsigned long)p->addr; addr++) {
-		other_kp = get_kprobe((void *)addr);
-		if (other_kp)
-			other_kp->ainsn.inst_flag &= ~INST_FLAG_BOOSTABLE;
-	}
-}
-
-int __kprobes arch_prepare_kprobe(struct kprobe *p)
-{
-	unsigned long addr = (unsigned long) p->addr;
-	unsigned long *kprobe_addr = (unsigned long *)(addr & ~0xFULL);
-	unsigned long kprobe_inst=0;
-	unsigned int slot = addr & 0xf, template, major_opcode = 0;
-	bundle_t *bundle;
-	int qp;
-
-	bundle = &((kprobe_opcode_t *)kprobe_addr)->bundle;
-	template = bundle->quad0.template;
-
-	if(valid_kprobe_addr(template, slot, addr))
-		return -EINVAL;
-
-	/* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */
-	if (slot == 1 && bundle_encoding[template][1] == L)
-		slot++;
-
-	/* Get kprobe_inst and major_opcode from the bundle */
-	get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode);
-
-	qp = unsupported_inst(template, slot, major_opcode, kprobe_inst, addr);
-	if (qp < 0)
-		return -EINVAL;
-
-	p->ainsn.insn = get_insn_slot();
-	if (!p->ainsn.insn)
-		return -ENOMEM;
-	memcpy(&p->opcode, kprobe_addr, sizeof(kprobe_opcode_t));
-	memcpy(p->ainsn.insn, kprobe_addr, sizeof(kprobe_opcode_t));
-
-	prepare_break_inst(template, slot, major_opcode, kprobe_inst, p, qp);
-
-	prepare_booster(p);
-
-	return 0;
-}
-
-void __kprobes arch_arm_kprobe(struct kprobe *p)
-{
-	unsigned long arm_addr;
-	bundle_t *src, *dest;
-
-	arm_addr = ((unsigned long)p->addr) & ~0xFUL;
-	dest = &((kprobe_opcode_t *)arm_addr)->bundle;
-	src = &p->opcode.bundle;
-
-	flush_icache_range((unsigned long)p->ainsn.insn,
-			   (unsigned long)p->ainsn.insn +
-			   sizeof(kprobe_opcode_t) * MAX_INSN_SIZE);
-
-	switch (p->ainsn.slot) {
-		case 0:
-			dest->quad0.slot0 = src->quad0.slot0;
-			break;
-		case 1:
-			dest->quad1.slot1_p1 = src->quad1.slot1_p1;
-			break;
-		case 2:
-			dest->quad1.slot2 = src->quad1.slot2;
-			break;
-	}
-	flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t));
-}
-
-void __kprobes arch_disarm_kprobe(struct kprobe *p)
-{
-	unsigned long arm_addr;
-	bundle_t *src, *dest;
-
-	arm_addr = ((unsigned long)p->addr) & ~0xFUL;
-	dest = &((kprobe_opcode_t *)arm_addr)->bundle;
-	/* p->ainsn.insn contains the original unaltered kprobe_opcode_t */
-	src = &p->ainsn.insn->bundle;
-	switch (p->ainsn.slot) {
-		case 0:
-			dest->quad0.slot0 = src->quad0.slot0;
-			break;
-		case 1:
-			dest->quad1.slot1_p1 = src->quad1.slot1_p1;
-			break;
-		case 2:
-			dest->quad1.slot2 = src->quad1.slot2;
-			break;
-	}
-	flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t));
-}
-
-void __kprobes arch_remove_kprobe(struct kprobe *p)
-{
-	if (p->ainsn.insn) {
-		free_insn_slot(p->ainsn.insn,
-			       p->ainsn.inst_flag & INST_FLAG_BOOSTABLE);
-		p->ainsn.insn = NULL;
-	}
-}
-/*
- * We are resuming execution after a single step fault, so the pt_regs
- * structure reflects the register state after we executed the instruction
- * located in the kprobe (p->ainsn.insn->bundle).  We still need to adjust
- * the ip to point back to the original stack address. To set the IP address
- * to original stack address, handle the case where we need to fixup the
- * relative IP address and/or fixup branch register.
- */
-static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
-{
-	unsigned long bundle_addr = (unsigned long) (&p->ainsn.insn->bundle);
-	unsigned long resume_addr = (unsigned long)p->addr & ~0xFULL;
-	unsigned long template;
-	int slot = ((unsigned long)p->addr & 0xf);
-
-	template = p->ainsn.insn->bundle.quad0.template;
-
-	if (slot == 1 && bundle_encoding[template][1] == L)
-		slot = 2;
-
-	if (p->ainsn.inst_flag & ~INST_FLAG_BOOSTABLE) {
-
-		if (p->ainsn.inst_flag & INST_FLAG_FIX_RELATIVE_IP_ADDR) {
-			/* Fix relative IP address */
-			regs->cr_iip = (regs->cr_iip - bundle_addr) +
-					resume_addr;
-		}
-
-		if (p->ainsn.inst_flag & INST_FLAG_FIX_BRANCH_REG) {
-		/*
-		 * Fix target branch register, software convention is
-		 * to use either b0 or b6 or b7, so just checking
-		 * only those registers
-		 */
-			switch (p->ainsn.target_br_reg) {
-			case 0:
-				if ((regs->b0 == bundle_addr) ||
-					(regs->b0 == bundle_addr + 0x10)) {
-					regs->b0 = (regs->b0 - bundle_addr) +
-						resume_addr;
-				}
-				break;
-			case 6:
-				if ((regs->b6 == bundle_addr) ||
-					(regs->b6 == bundle_addr + 0x10)) {
-					regs->b6 = (regs->b6 - bundle_addr) +
-						resume_addr;
-				}
-				break;
-			case 7:
-				if ((regs->b7 == bundle_addr) ||
-					(regs->b7 == bundle_addr + 0x10)) {
-					regs->b7 = (regs->b7 - bundle_addr) +
-						resume_addr;
-				}
-				break;
-			} /* end switch */
-		}
-		goto turn_ss_off;
-	}
-
-	if (slot == 2) {
-		if (regs->cr_iip == bundle_addr + 0x10) {
-			regs->cr_iip = resume_addr + 0x10;
-		}
-	} else {
-		if (regs->cr_iip == bundle_addr) {
-			regs->cr_iip = resume_addr;
-		}
-	}
-
-turn_ss_off:
-	/* Turn off Single Step bit */
-	ia64_psr(regs)->ss = 0;
-}
-
-static void __kprobes prepare_ss(struct kprobe *p, struct pt_regs *regs)
-{
-	unsigned long bundle_addr = (unsigned long) &p->ainsn.insn->bundle;
-	unsigned long slot = (unsigned long)p->addr & 0xf;
-
-	/* single step inline if break instruction */
-	if (p->ainsn.inst_flag == INST_FLAG_BREAK_INST)
-		regs->cr_iip = (unsigned long)p->addr & ~0xFULL;
-	else
-		regs->cr_iip = bundle_addr & ~0xFULL;
-
-	if (slot > 2)
-		slot = 0;
-
-	ia64_psr(regs)->ri = slot;
-
-	/* turn on single stepping */
-	ia64_psr(regs)->ss = 1;
-}
-
-static int __kprobes is_ia64_break_inst(struct pt_regs *regs)
-{
-	unsigned int slot = ia64_psr(regs)->ri;
-	unsigned long *kprobe_addr = (unsigned long *)regs->cr_iip;
-	bundle_t bundle;
-
-	memcpy(&bundle, kprobe_addr, sizeof(bundle_t));
-
-	return __is_ia64_break_inst(&bundle, slot);
-}
-
-static int __kprobes pre_kprobes_handler(struct die_args *args)
-{
-	struct kprobe *p;
-	int ret = 0;
-	struct pt_regs *regs = args->regs;
-	kprobe_opcode_t *addr = (kprobe_opcode_t *)instruction_pointer(regs);
-	struct kprobe_ctlblk *kcb;
-
-	/*
-	 * We don't want to be preempted for the entire
-	 * duration of kprobe processing
-	 */
-	preempt_disable();
-	kcb = get_kprobe_ctlblk();
-
-	/* Handle recursion cases */
-	if (kprobe_running()) {
-		p = get_kprobe(addr);
-		if (p) {
-			if ((kcb->kprobe_status == KPROBE_HIT_SS) &&
-	 		     (p->ainsn.inst_flag == INST_FLAG_BREAK_INST)) {
-				ia64_psr(regs)->ss = 0;
-				goto no_kprobe;
-			}
-			/* We have reentered the pre_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, kcb);
-			kprobes_inc_nmissed_count(p);
-			prepare_ss(p, regs);
-			kcb->kprobe_status = KPROBE_REENTER;
-			return 1;
-		} else if (!is_ia64_break_inst(regs)) {
-			/* 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;
-		} else {
-			/* Not our break */
-			goto no_kprobe;
-		}
-	}
-
-	p = get_kprobe(addr);
-	if (!p) {
-		if (!is_ia64_break_inst(regs)) {
-			/*
-			 * 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 our break, let kernel handle it */
-		goto no_kprobe;
-	}
-
-	set_current_kprobe(p, kcb);
-	kcb->kprobe_status = KPROBE_HIT_ACTIVE;
-
-	if (p->pre_handler && p->pre_handler(p, regs)) {
-		reset_current_kprobe();
-		preempt_enable_no_resched();
-		return 1;
-	}
-
-#if !defined(CONFIG_PREEMPTION)
-	if (p->ainsn.inst_flag == INST_FLAG_BOOSTABLE && !p->post_handler) {
-		/* Boost up -- we can execute copied instructions directly */
-		ia64_psr(regs)->ri = p->ainsn.slot;
-		regs->cr_iip = (unsigned long)&p->ainsn.insn->bundle & ~0xFULL;
-		/* turn single stepping off */
-		ia64_psr(regs)->ss = 0;
-
-		reset_current_kprobe();
-		preempt_enable_no_resched();
-		return 1;
-	}
-#endif
-	prepare_ss(p, regs);
-	kcb->kprobe_status = KPROBE_HIT_SS;
-	return 1;
-
-no_kprobe:
-	preempt_enable_no_resched();
-	return ret;
-}
-
-static int __kprobes post_kprobes_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);
-
-	/*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;
-}
-
-int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
-{
-	struct kprobe *cur = kprobe_running();
-	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
-
-
-	switch(kcb->kprobe_status) {
-	case KPROBE_HIT_SS:
-	case KPROBE_REENTER:
-		/*
-		 * We are here because the instruction being single
-		 * stepped caused a page fault. We reset the current
-		 * kprobe and the instruction pointer points back to
-		 * the probe address and allow the page fault handler
-		 * to continue as a normal page fault.
-		 */
-		regs->cr_iip = ((unsigned long)cur->addr) & ~0xFULL;
-		ia64_psr(regs)->ri = ((unsigned long)cur->addr) & 0xf;
-		if (kcb->kprobe_status == KPROBE_REENTER)
-			restore_previous_kprobe(kcb);
-		else
-			reset_current_kprobe();
-		preempt_enable_no_resched();
-		break;
-	case KPROBE_HIT_ACTIVE:
-	case KPROBE_HIT_SSDONE:
-		/*
-		 * In case the user-specified fault handler returned
-		 * zero, try to fix up.
-		 */
-		if (ia64_done_with_exception(regs))
-			return 1;
-
-		/*
-		 * Let ia64_do_page_fault() fix it.
-		 */
-		break;
-	default:
-		break;
-	}
-
-	return 0;
-}
-
-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;
-
-	if (args->regs && user_mode(args->regs))
-		return ret;
-
-	switch(val) {
-	case DIE_BREAK:
-		/* err is break number from ia64_bad_break() */
-		if ((args->err >> 12) == (__IA64_BREAK_KPROBE >> 12)
-			|| args->err == 0)
-			if (pre_kprobes_handler(args))
-				ret = NOTIFY_STOP;
-		break;
-	case DIE_FAULT:
-		/* err is vector number from ia64_fault() */
-		if (args->err == 36)
-			if (post_kprobes_handler(args->regs))
-				ret = NOTIFY_STOP;
-		break;
-	default:
-		break;
-	}
-	return ret;
-}
-
-static struct kprobe trampoline_p = {
-	.pre_handler = trampoline_probe_handler
-};
-
-int __init arch_init_kprobes(void)
-{
-	trampoline_p.addr =
-		dereference_function_descriptor(__kretprobe_trampoline);
-	return register_kprobe(&trampoline_p);
-}
-
-int __kprobes arch_trampoline_kprobe(struct kprobe *p)
-{
-	if (p->addr ==
-		dereference_function_descriptor(__kretprobe_trampoline))
-		return 1;
-
-	return 0;
-}