1#ifndef _ASM_KPROBES_H
  2#define _ASM_KPROBES_H
  3/*
  4 *  Kernel Probes (KProbes)
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License as published by
  8 * the Free Software Foundation; either version 2 of the License, or
  9 * (at your option) any later version.
 10 *
 11 * This program is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 * GNU General Public License for more details.
 15 *
 16 * You should have received a copy of the GNU General Public License
 17 * along with this program; if not, write to the Free Software
 18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 19 *
 20 * Copyright (C) IBM Corporation, 2002, 2004
 21 * Copyright (C) Intel Corporation, 2005
 22 *
 23 * 2005-Apr     Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
 24 *              <anil.s.keshavamurthy@intel.com> adapted from i386
 25 */
 26#include <linux/types.h>
 27#include <linux/ptrace.h>
 28#include <linux/percpu.h>
 29#include <asm/break.h>
 30
 31#define __ARCH_WANT_KPROBES_INSN_SLOT
 32#define MAX_INSN_SIZE   2	/* last half is for kprobe-booster */
 33#define BREAK_INST	(long)(__IA64_BREAK_KPROBE << 6)
 34#define NOP_M_INST	(long)(1<<27)
 35#define BRL_INST(i1, i2) ((long)((0xcL << 37) |	/* brl */ \
 36				(0x1L << 12) |	/* many */ \
 37				(((i1) & 1) << 36) | ((i2) << 13))) /* imm */
 38
 39typedef union cmp_inst {
 40	struct {
 41	unsigned long long qp : 6;
 42	unsigned long long p1 : 6;
 43	unsigned long long c  : 1;
 44	unsigned long long r2 : 7;
 45	unsigned long long r3 : 7;
 46	unsigned long long p2 : 6;
 47	unsigned long long ta : 1;
 48	unsigned long long x2 : 2;
 49	unsigned long long tb : 1;
 50	unsigned long long opcode : 4;
 51	unsigned long long reserved : 23;
 52	}f;
 53	unsigned long long l;
 54} cmp_inst_t;
 55
 56struct kprobe;
 57
 58typedef struct _bundle {
 59	struct {
 60		unsigned long long template : 5;
 61		unsigned long long slot0 : 41;
 62		unsigned long long slot1_p0 : 64-46;
 63	} quad0;
 64	struct {
 65		unsigned long long slot1_p1 : 41 - (64-46);
 66		unsigned long long slot2 : 41;
 67	} quad1;
 68} __attribute__((__aligned__(16)))  bundle_t;
 69
 70struct prev_kprobe {
 71	struct kprobe *kp;
 72	unsigned long status;
 73};
 74
 75#define	MAX_PARAM_RSE_SIZE	(0x60+0x60/0x3f)
 76/* per-cpu kprobe control block */
 77#define ARCH_PREV_KPROBE_SZ 2
 78struct kprobe_ctlblk {
 79	unsigned long kprobe_status;
 80	struct pt_regs jprobe_saved_regs;
 81	unsigned long jprobes_saved_stacked_regs[MAX_PARAM_RSE_SIZE];
 82	unsigned long *bsp;
 83	unsigned long cfm;
 84	atomic_t prev_kprobe_index;
 85	struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
 86};
 87
 88#define kretprobe_blacklist_size 0
 89
 90#define SLOT0_OPCODE_SHIFT	(37)
 91#define SLOT1_p1_OPCODE_SHIFT	(37 - (64-46))
 92#define SLOT2_OPCODE_SHIFT 	(37)
 93
 94#define INDIRECT_CALL_OPCODE		(1)
 95#define IP_RELATIVE_CALL_OPCODE		(5)
 96#define IP_RELATIVE_BRANCH_OPCODE	(4)
 97#define IP_RELATIVE_PREDICT_OPCODE	(7)
 98#define LONG_BRANCH_OPCODE		(0xC)
 99#define LONG_CALL_OPCODE		(0xD)
100#define flush_insn_slot(p)		do { } while (0)
101
102typedef struct kprobe_opcode {
103	bundle_t bundle;
104} kprobe_opcode_t;
105
106/* Architecture specific copy of original instruction*/
107struct arch_specific_insn {
108	/* copy of the instruction to be emulated */
109	kprobe_opcode_t *insn;
110 #define INST_FLAG_FIX_RELATIVE_IP_ADDR		1
111 #define INST_FLAG_FIX_BRANCH_REG		2
112 #define INST_FLAG_BREAK_INST			4
113 #define INST_FLAG_BOOSTABLE			8
114 	unsigned long inst_flag;
115 	unsigned short target_br_reg;
116	unsigned short slot;
117};
118
119extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
120extern int kprobe_exceptions_notify(struct notifier_block *self,
121				    unsigned long val, void *data);
122
123extern void invalidate_stacked_regs(void);
124extern void flush_register_stack(void);
125extern void arch_remove_kprobe(struct kprobe *p);
126
127#endif				/* _ASM_KPROBES_H */