Commit 71f6e58e authored by Naveen N. Rao's avatar Naveen N. Rao Committed by Michael Ellerman
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powerpc/kprobes: Convert __kprobes to NOKPROBE_SYMBOL() 



Along similar lines as commit 9326638c ("kprobes, x86: Use NOKPROBE_SYMBOL()
instead of __kprobes annotation"), convert __kprobes annotation to either
NOKPROBE_SYMBOL() or nokprobe_inline. The latter forces inlining, in which case
the caller needs to be added to NOKPROBE_SYMBOL().

Also:
 - blacklist arch_deref_entry_point(), and
 - convert a few regular inlines to nokprobe_inline in lib/sstep.c

A key benefit is the ability to detect such symbols as being
blacklisted. Before this patch:

  $ cat /sys/kernel/debug/kprobes/blacklist | grep read_mem
  $ perf probe read_mem
  Failed to write event: Invalid argument
    Error: Failed to add events.
  $ dmesg | tail -1
  [ 3736.112815] Could not insert probe at _text+10014968: -22

After patch:
  $ cat /sys/kernel/debug/kprobes/blacklist | grep read_mem
  0xc000000000072b50-0xc000000000072d20	read_mem
  $ perf probe read_mem
  read_mem is blacklisted function, skip it.
  Added new events:
    (null):(null)        (on read_mem)
    probe:read_mem       (on read_mem)

  You can now use it in all perf tools, such as:

	  perf record -e probe:read_mem -aR sleep 1

  $ grep " read_mem" /proc/kallsyms
  c000000000072b50 t read_mem
  c0000000005f3b40 t read_mem
  $ cat /sys/kernel/debug/kprobes/list
  c0000000005f3b48  k  read_mem+0x8    [DISABLED]

Acked-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
[mpe: Minor change log formatting, fix up some conflicts]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 700e6437

arch/powerpc/kernel/kprobes.c

+34 −21
Original line number Diff line number Diff line
@@ -42,7 +42,7 @@ DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); 


struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}};



int __kprobes arch_prepare_kprobe(struct kprobe *p)

int arch_prepare_kprobe(struct kprobe *p)

{

	int ret = 0;

	kprobe_opcode_t insn = *p->addr;
@@ -74,30 +74,34 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p) 
	p->ainsn.boostable = 0;

	return ret;

}

NOKPROBE_SYMBOL(arch_prepare_kprobe);



void __kprobes arch_arm_kprobe(struct kprobe *p)

void 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));

}

NOKPROBE_SYMBOL(arch_arm_kprobe);



void __kprobes arch_disarm_kprobe(struct kprobe *p)

void 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));

}

NOKPROBE_SYMBOL(arch_disarm_kprobe);



void __kprobes arch_remove_kprobe(struct kprobe *p)

void arch_remove_kprobe(struct kprobe *p)

{

	if (p->ainsn.insn) {

		free_insn_slot(p->ainsn.insn, 0);

		p->ainsn.insn = NULL;

	}

}

NOKPROBE_SYMBOL(arch_remove_kprobe);



static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)

static nokprobe_inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)

{

	enable_single_step(regs);
@@ -110,37 +114,37 @@ static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs) 
	regs->nip = (unsigned long)p->ainsn.insn;

}



static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)

static nokprobe_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 void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)

static nokprobe_inline void 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_msr = kcb->prev_kprobe.saved_msr;

}



static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,

static nokprobe_inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs,

				struct kprobe_ctlblk *kcb)

{

	__this_cpu_write(current_kprobe, p);

	kcb->kprobe_saved_msr = regs->msr;

}



void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,

				      struct pt_regs *regs)

void arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs)

{

	ri->ret_addr = (kprobe_opcode_t *)regs->link;



	/* Replace the return addr with trampoline addr */

	regs->link = (unsigned long)kretprobe_trampoline;

}

NOKPROBE_SYMBOL(arch_prepare_kretprobe);



int __kprobes kprobe_handler(struct pt_regs *regs)

int kprobe_handler(struct pt_regs *regs)

{

	struct kprobe *p;

	int ret = 0;
@@ -273,6 +277,7 @@ no_kprobe: 
	preempt_enable_no_resched();

	return ret;

}

NOKPROBE_SYMBOL(kprobe_handler);



/*

 * Function return probe trampoline:
@@ -290,8 +295,7 @@ asm(".global kretprobe_trampoline\n" 
/*

 * Called when the probe at kretprobe trampoline is hit

 */

static int __kprobes trampoline_probe_handler(struct kprobe *p,

						struct pt_regs *regs)

static int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)

{

	struct kretprobe_instance *ri = NULL;

	struct hlist_head *head, empty_rp;
@@ -360,6 +364,7 @@ static int __kprobes trampoline_probe_handler(struct kprobe *p, 
	 */

	return 1;

}

NOKPROBE_SYMBOL(trampoline_probe_handler);



/*

 * Called after single-stepping.  p->addr is the address of the
@@ -369,7 +374,7 @@ static int __kprobes trampoline_probe_handler(struct kprobe *p, 
 * single-stepped a copy of the instruction.  The address of this

 * copy is p->ainsn.insn.

 */

int __kprobes kprobe_post_handler(struct pt_regs *regs)

int kprobe_post_handler(struct pt_regs *regs)

{

	struct kprobe *cur = kprobe_running();

	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
@@ -409,8 +414,9 @@ out: 


	return 1;

}

NOKPROBE_SYMBOL(kprobe_post_handler);



int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)

int kprobe_fault_handler(struct pt_regs *regs, int trapnr)

{

	struct kprobe *cur = kprobe_running();

	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
@@ -473,13 +479,15 @@ int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr) 
	}

	return 0;

}

NOKPROBE_SYMBOL(kprobe_fault_handler);



unsigned long arch_deref_entry_point(void *entry)

{

	return ppc_global_function_entry(entry);

}

NOKPROBE_SYMBOL(arch_deref_entry_point);



int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)

int 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();
@@ -496,17 +504,20 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs) 


	return 1;

}

NOKPROBE_SYMBOL(setjmp_pre_handler);



void __used __kprobes jprobe_return(void)

void __used jprobe_return(void)

{

	asm volatile("trap" ::: "memory");

}

NOKPROBE_SYMBOL(jprobe_return);



static void __used __kprobes jprobe_return_end(void)

static void __used jprobe_return_end(void)

{

};

}

NOKPROBE_SYMBOL(jprobe_return_end);



int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)

int longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)

{

	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
@@ -519,6 +530,7 @@ int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs) 
	preempt_enable_no_resched();

	return 1;

}

NOKPROBE_SYMBOL(longjmp_break_handler);



static struct kprobe trampoline_p = {

	.addr = (kprobe_opcode_t *) &kretprobe_trampoline,
@@ -530,10 +542,11 @@ int __init arch_init_kprobes(void) 
	return register_kprobe(&trampoline_p);

}



int __kprobes arch_trampoline_kprobe(struct kprobe *p)

int arch_trampoline_kprobe(struct kprobe *p)

{

	if (p->addr == (kprobe_opcode_t *)&kretprobe_trampoline)

		return 1;



	return 0;

}

NOKPROBE_SYMBOL(arch_trampoline_kprobe);

arch/powerpc/lib/code-patching.c

+3 −1
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
 */



#include <linux/kernel.h>

#include <linux/kprobes.h>

#include <linux/vmalloc.h>

#include <linux/init.h>

#include <linux/mm.h>
@@ -59,7 +60,7 @@ bool is_offset_in_branch_range(long offset) 
 * Helper to check if a given instruction is a conditional branch

 * Derived from the conditional checks in analyse_instr()

 */

bool __kprobes is_conditional_branch(unsigned int instr)

bool is_conditional_branch(unsigned int instr)

{

	unsigned int opcode = instr >> 26;
@@ -75,6 +76,7 @@ bool __kprobes is_conditional_branch(unsigned int instr) 
	}

	return false;

}

NOKPROBE_SYMBOL(is_conditional_branch);



unsigned int create_branch(const unsigned int *addr,

			   unsigned long target, int flags)

arch/powerpc/lib/sstep.c

+44 −38
Original line number Diff line number Diff line
@@ -49,7 +49,8 @@ extern int do_stxvd2x(int rn, unsigned long ea); 
/*

 * Emulate the truncation of 64 bit values in 32-bit mode.

 */

static unsigned long truncate_if_32bit(unsigned long msr, unsigned long val)

static nokprobe_inline unsigned long truncate_if_32bit(unsigned long msr,

							unsigned long val)

{

#ifdef __powerpc64__

	if ((msr & MSR_64BIT) == 0)
@@ -61,7 +62,7 @@ static unsigned long truncate_if_32bit(unsigned long msr, unsigned long val) 
/*

 * Determine whether a conditional branch instruction would branch.

 */

static int __kprobes branch_taken(unsigned int instr, struct pt_regs *regs)

static nokprobe_inline int branch_taken(unsigned int instr, struct pt_regs *regs)

{

	unsigned int bo = (instr >> 21) & 0x1f;

	unsigned int bi;
@@ -81,8 +82,7 @@ static int __kprobes branch_taken(unsigned int instr, struct pt_regs *regs) 
	return 1;

}





static long __kprobes address_ok(struct pt_regs *regs, unsigned long ea, int nb)

static nokprobe_inline long address_ok(struct pt_regs *regs, unsigned long ea, int nb)

{

	if (!user_mode(regs))

		return 1;
@@ -92,7 +92,7 @@ static long __kprobes address_ok(struct pt_regs *regs, unsigned long ea, int nb) 
/*

 * Calculate effective address for a D-form instruction

 */

static unsigned long __kprobes dform_ea(unsigned int instr, struct pt_regs *regs)

static nokprobe_inline unsigned long dform_ea(unsigned int instr, struct pt_regs *regs)

{

	int ra;

	unsigned long ea;
@@ -109,7 +109,7 @@ static unsigned long __kprobes dform_ea(unsigned int instr, struct pt_regs *regs 
/*

 * Calculate effective address for a DS-form instruction

 */

static unsigned long __kprobes dsform_ea(unsigned int instr, struct pt_regs *regs)

static nokprobe_inline unsigned long dsform_ea(unsigned int instr, struct pt_regs *regs)

{

	int ra;

	unsigned long ea;
@@ -126,7 +126,7 @@ static unsigned long __kprobes dsform_ea(unsigned int instr, struct pt_regs *reg 
/*

 * Calculate effective address for an X-form instruction

 */

static unsigned long __kprobes xform_ea(unsigned int instr,

static nokprobe_inline unsigned long xform_ea(unsigned int instr,

						struct pt_regs *regs)

{

	int ra, rb;
@@ -145,33 +145,33 @@ static unsigned long __kprobes xform_ea(unsigned int instr, 
 * Return the largest power of 2, not greater than sizeof(unsigned long),

 * such that x is a multiple of it.

 */

static inline unsigned long max_align(unsigned long x)

static nokprobe_inline unsigned long max_align(unsigned long x)

{

	x |= sizeof(unsigned long);

	return x & -x;		/* isolates rightmost bit */

}





static inline unsigned long byterev_2(unsigned long x)

static nokprobe_inline unsigned long byterev_2(unsigned long x)

{

	return ((x >> 8) & 0xff) | ((x & 0xff) << 8);

}



static inline unsigned long byterev_4(unsigned long x)

static nokprobe_inline unsigned long byterev_4(unsigned long x)

{

	return ((x >> 24) & 0xff) | ((x >> 8) & 0xff00) |

		((x & 0xff00) << 8) | ((x & 0xff) << 24);

}



#ifdef __powerpc64__

static inline unsigned long byterev_8(unsigned long x)

static nokprobe_inline unsigned long byterev_8(unsigned long x)

{

	return (byterev_4(x) << 32) | byterev_4(x >> 32);

}

#endif



static int __kprobes read_mem_aligned(unsigned long *dest, unsigned long ea,

				      int nb)

static nokprobe_inline int read_mem_aligned(unsigned long *dest,

					unsigned long ea, int nb)

{

	int err = 0;

	unsigned long x = 0;
@@ -197,8 +197,8 @@ static int __kprobes read_mem_aligned(unsigned long *dest, unsigned long ea, 
	return err;

}



static int __kprobes read_mem_unaligned(unsigned long *dest, unsigned long ea,

					int nb, struct pt_regs *regs)

static nokprobe_inline int read_mem_unaligned(unsigned long *dest,

				unsigned long ea, int nb, struct pt_regs *regs)

{

	int err;

	unsigned long x, b, c;
@@ -248,7 +248,7 @@ static int __kprobes read_mem_unaligned(unsigned long *dest, unsigned long ea, 
 * Read memory at address ea for nb bytes, return 0 for success

 * or -EFAULT if an error occurred.

 */

static int __kprobes read_mem(unsigned long *dest, unsigned long ea, int nb,

static int read_mem(unsigned long *dest, unsigned long ea, int nb,

			      struct pt_regs *regs)

{

	if (!address_ok(regs, ea, nb))
@@ -257,9 +257,10 @@ static int __kprobes read_mem(unsigned long *dest, unsigned long ea, int nb, 
		return read_mem_aligned(dest, ea, nb);

	return read_mem_unaligned(dest, ea, nb, regs);

}

NOKPROBE_SYMBOL(read_mem);



static int __kprobes write_mem_aligned(unsigned long val, unsigned long ea,

				       int nb)

static nokprobe_inline int write_mem_aligned(unsigned long val,

					unsigned long ea, int nb)

{

	int err = 0;
@@ -282,8 +283,8 @@ static int __kprobes write_mem_aligned(unsigned long val, unsigned long ea, 
	return err;

}



static int __kprobes write_mem_unaligned(unsigned long val, unsigned long ea,

					 int nb, struct pt_regs *regs)

static nokprobe_inline int write_mem_unaligned(unsigned long val,

				unsigned long ea, int nb, struct pt_regs *regs)

{

	int err;

	unsigned long c;
@@ -325,7 +326,7 @@ static int __kprobes write_mem_unaligned(unsigned long val, unsigned long ea, 
 * Write memory at address ea for nb bytes, return 0 for success

 * or -EFAULT if an error occurred.

 */

static int __kprobes write_mem(unsigned long val, unsigned long ea, int nb,

static int write_mem(unsigned long val, unsigned long ea, int nb,

			       struct pt_regs *regs)

{

	if (!address_ok(regs, ea, nb))
@@ -334,13 +335,14 @@ static int __kprobes write_mem(unsigned long val, unsigned long ea, int nb, 
		return write_mem_aligned(val, ea, nb);

	return write_mem_unaligned(val, ea, nb, regs);

}

NOKPROBE_SYMBOL(write_mem);



#ifdef CONFIG_PPC_FPU

/*

 * Check the address and alignment, and call func to do the actual

 * load or store.

 */

static int __kprobes do_fp_load(int rn, int (*func)(int, unsigned long),

static int do_fp_load(int rn, int (*func)(int, unsigned long),

				unsigned long ea, int nb,

				struct pt_regs *regs)

{
@@ -380,8 +382,9 @@ static int __kprobes do_fp_load(int rn, int (*func)(int, unsigned long), 
		return err;

	return (*func)(rn, ptr);

}

NOKPROBE_SYMBOL(do_fp_load);



static int __kprobes do_fp_store(int rn, int (*func)(int, unsigned long),

static int do_fp_store(int rn, int (*func)(int, unsigned long),

				 unsigned long ea, int nb,

				 struct pt_regs *regs)

{
@@ -425,11 +428,12 @@ static int __kprobes do_fp_store(int rn, int (*func)(int, unsigned long), 
	}

	return err;

}

NOKPROBE_SYMBOL(do_fp_store);

#endif



#ifdef CONFIG_ALTIVEC

/* For Altivec/VMX, no need to worry about alignment */

static int __kprobes do_vec_load(int rn, int (*func)(int, unsigned long),

static nokprobe_inline int do_vec_load(int rn, int (*func)(int, unsigned long),

				 unsigned long ea, struct pt_regs *regs)

{

	if (!address_ok(regs, ea & ~0xfUL, 16))
@@ -437,7 +441,7 @@ static int __kprobes do_vec_load(int rn, int (*func)(int, unsigned long), 
	return (*func)(rn, ea);

}



static int __kprobes do_vec_store(int rn, int (*func)(int, unsigned long),

static nokprobe_inline int do_vec_store(int rn, int (*func)(int, unsigned long),

				  unsigned long ea, struct pt_regs *regs)

{

	if (!address_ok(regs, ea & ~0xfUL, 16))
@@ -447,7 +451,7 @@ static int __kprobes do_vec_store(int rn, int (*func)(int, unsigned long), 
#endif /* CONFIG_ALTIVEC */



#ifdef CONFIG_VSX

static int __kprobes do_vsx_load(int rn, int (*func)(int, unsigned long),

static nokprobe_inline int do_vsx_load(int rn, int (*func)(int, unsigned long),

				 unsigned long ea, struct pt_regs *regs)

{

	int err;
@@ -465,7 +469,7 @@ static int __kprobes do_vsx_load(int rn, int (*func)(int, unsigned long), 
	return err;

}



static int __kprobes do_vsx_store(int rn, int (*func)(int, unsigned long),

static nokprobe_inline int do_vsx_store(int rn, int (*func)(int, unsigned long),

				 unsigned long ea, struct pt_regs *regs)

{

	int err;
@@ -522,7 +526,7 @@ static int __kprobes do_vsx_store(int rn, int (*func)(int, unsigned long), 
		: "=r" (err)				\

		: "r" (addr), "i" (-EFAULT), "0" (err))



static void __kprobes set_cr0(struct pt_regs *regs, int rd)

static nokprobe_inline void set_cr0(struct pt_regs *regs, int rd)

{

	long val = regs->gpr[rd];
@@ -539,7 +543,7 @@ static void __kprobes set_cr0(struct pt_regs *regs, int rd) 
		regs->ccr |= 0x20000000;

}



static void __kprobes add_with_carry(struct pt_regs *regs, int rd,

static nokprobe_inline void add_with_carry(struct pt_regs *regs, int rd,

				     unsigned long val1, unsigned long val2,

				     unsigned long carry_in)

{
@@ -560,7 +564,7 @@ static void __kprobes add_with_carry(struct pt_regs *regs, int rd, 
		regs->xer &= ~XER_CA;

}



static void __kprobes do_cmp_signed(struct pt_regs *regs, long v1, long v2,

static nokprobe_inline void do_cmp_signed(struct pt_regs *regs, long v1, long v2,

				    int crfld)

{

	unsigned int crval, shift;
@@ -576,7 +580,7 @@ static void __kprobes do_cmp_signed(struct pt_regs *regs, long v1, long v2, 
	regs->ccr = (regs->ccr & ~(0xf << shift)) | (crval << shift);

}



static void __kprobes do_cmp_unsigned(struct pt_regs *regs, unsigned long v1,

static nokprobe_inline void do_cmp_unsigned(struct pt_regs *regs, unsigned long v1,

				      unsigned long v2, int crfld)

{

	unsigned int crval, shift;
@@ -592,7 +596,7 @@ static void __kprobes do_cmp_unsigned(struct pt_regs *regs, unsigned long v1, 
	regs->ccr = (regs->ccr & ~(0xf << shift)) | (crval << shift);

}



static int __kprobes trap_compare(long v1, long v2)

static nokprobe_inline int trap_compare(long v1, long v2)

{

	int ret = 0;
@@ -631,7 +635,7 @@ static int __kprobes trap_compare(long v1, long v2) 
 * Returns 1 if the instruction has been executed, or 0 if not.

 * Sets *op to indicate what the instruction does.

 */

int __kprobes analyse_instr(struct instruction_op *op, struct pt_regs *regs,

int analyse_instr(struct instruction_op *op, struct pt_regs *regs,

			    unsigned int instr)

{

	unsigned int opcode, ra, rb, rd, spr, u;
@@ -1692,6 +1696,7 @@ int __kprobes analyse_instr(struct instruction_op *op, struct pt_regs *regs, 
#endif

}

EXPORT_SYMBOL_GPL(analyse_instr);

NOKPROBE_SYMBOL(analyse_instr);



/*

 * For PPC32 we always use stwu with r1 to change the stack pointer.
@@ -1701,7 +1706,7 @@ EXPORT_SYMBOL_GPL(analyse_instr); 
 * don't emulate the real store operation. We will do real store

 * operation safely in exception return code by checking this flag.

 */

static __kprobes int handle_stack_update(unsigned long ea, struct pt_regs *regs)

static nokprobe_inline int handle_stack_update(unsigned long ea, struct pt_regs *regs)

{

#ifdef CONFIG_PPC32

	/*
@@ -1721,7 +1726,7 @@ static __kprobes int handle_stack_update(unsigned long ea, struct pt_regs *regs) 
	return 0;

}



static __kprobes void do_signext(unsigned long *valp, int size)

static nokprobe_inline void do_signext(unsigned long *valp, int size)

{

	switch (size) {

	case 2:
@@ -1733,7 +1738,7 @@ static __kprobes void do_signext(unsigned long *valp, int size) 
	}

}



static __kprobes void do_byterev(unsigned long *valp, int size)

static nokprobe_inline void do_byterev(unsigned long *valp, int size)

{

	switch (size) {

	case 2:
@@ -1757,7 +1762,7 @@ static __kprobes void do_byterev(unsigned long *valp, int size) 
 * or -1 if the instruction is one that should not be stepped,

 * such as an rfid, or a mtmsrd that would clear MSR_RI.

 */

int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)

int emulate_step(struct pt_regs *regs, unsigned int instr)

{

	struct instruction_op op;

	int r, err, size;
@@ -1988,3 +1993,4 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr) 
	regs->nip = truncate_if_32bit(regs->msr, regs->nip + 4);

	return 1;

}

NOKPROBE_SYMBOL(emulate_step);

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