1#ifndef _ASM_KPROBES_H
2#define _ASM_KPROBES_H
3/*
4 *  Kernel Probes (KProbes)
5 *  include/asm-ia64/kprobes.h
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 *
21 * Copyright (C) IBM Corporation, 2002, 2004
22 * Copyright (C) Intel Corporation, 2005
23 *
24 * 2005-Apr     Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
25 *              <anil.s.keshavamurthy@intel.com> adapted from i386
26 */
27#include <linux/types.h>
28#include <linux/ptrace.h>
29#include <linux/percpu.h>
30#include <asm/break.h>
31
32#define __ARCH_WANT_KPROBES_INSN_SLOT
33#define MAX_INSN_SIZE   1
34#define BREAK_INST	(long)(__IA64_BREAK_KPROBE << 6)
35
36typedef union cmp_inst {
37	struct {
38	unsigned long long qp : 6;
39	unsigned long long p1 : 6;
40	unsigned long long c  : 1;
41	unsigned long long r2 : 7;
42	unsigned long long r3 : 7;
43	unsigned long long p2 : 6;
44	unsigned long long ta : 1;
45	unsigned long long x2 : 2;
46	unsigned long long tb : 1;
47	unsigned long long opcode : 4;
48	unsigned long long reserved : 23;
49	}f;
50	unsigned long long l;
51} cmp_inst_t;
52
53struct kprobe;
54
55typedef struct _bundle {
56	struct {
57		unsigned long long template : 5;
58		unsigned long long slot0 : 41;
59		unsigned long long slot1_p0 : 64-46;
60	} quad0;
61	struct {
62		unsigned long long slot1_p1 : 41 - (64-46);
63		unsigned long long slot2 : 41;
64	} quad1;
65} __attribute__((__aligned__(16)))  bundle_t;
66
67struct prev_kprobe {
68	struct kprobe *kp;
69	unsigned long status;
70};
71
72#define	MAX_PARAM_RSE_SIZE	(0x60+0x60/0x3f)
73/* per-cpu kprobe control block */
74#define ARCH_PREV_KPROBE_SZ 2
75struct kprobe_ctlblk {
76	unsigned long kprobe_status;
77	struct pt_regs jprobe_saved_regs;
78	unsigned long jprobes_saved_stacked_regs[MAX_PARAM_RSE_SIZE];
79	unsigned long *bsp;
80	unsigned long cfm;
81	atomic_t prev_kprobe_index;
82	struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
83};
84
85#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)pentry
86
87#define ARCH_SUPPORTS_KRETPROBES
88#define  ARCH_INACTIVE_KPROBE_COUNT 1
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
106struct fnptr {
107	unsigned long ip;
108	unsigned long gp;
109};
110
111/* Architecture specific copy of original instruction*/
112struct arch_specific_insn {
113	/* copy of the instruction to be emulated */
114	kprobe_opcode_t *insn;
115 #define INST_FLAG_FIX_RELATIVE_IP_ADDR		1
116 #define INST_FLAG_FIX_BRANCH_REG		2
117 #define INST_FLAG_BREAK_INST			4
118 	unsigned long inst_flag;
119 	unsigned short target_br_reg;
120	unsigned short slot;
121};
122
123extern int kprobes_fault_handler(struct pt_regs *regs, int trapnr);
124extern int kprobe_exceptions_notify(struct notifier_block *self,
125				    unsigned long val, void *data);
126
127/* ia64 does not need this */
128static inline void jprobe_return(void)
129{
130}
131extern void invalidate_stacked_regs(void);
132extern void flush_register_stack(void);
133extern void arch_remove_kprobe(struct kprobe *p);
134
135#endif				/* _ASM_KPROBES_H */
136