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 <asm-generic/kprobes.h>
27 #include <asm/break.h>
28 
29 #define BREAK_INST	(long)(__IA64_BREAK_KPROBE << 6)
30 
31 #ifdef CONFIG_KPROBES
32 
33 #include <linux/types.h>
34 #include <linux/ptrace.h>
35 #include <linux/percpu.h>
36 
37 #define __ARCH_WANT_KPROBES_INSN_SLOT
38 #define MAX_INSN_SIZE   2	/* last half is for kprobe-booster */
39 #define NOP_M_INST	(long)(1<<27)
40 #define BRL_INST(i1, i2) ((long)((0xcL << 37) |	/* brl */ \
41 				(0x1L << 12) |	/* many */ \
42 				(((i1) & 1) << 36) | ((i2) << 13))) /* imm */
43 
44 typedef union cmp_inst {
45 	struct {
46 	unsigned long long qp : 6;
47 	unsigned long long p1 : 6;
48 	unsigned long long c  : 1;
49 	unsigned long long r2 : 7;
50 	unsigned long long r3 : 7;
51 	unsigned long long p2 : 6;
52 	unsigned long long ta : 1;
53 	unsigned long long x2 : 2;
54 	unsigned long long tb : 1;
55 	unsigned long long opcode : 4;
56 	unsigned long long reserved : 23;
57 	}f;
58 	unsigned long long l;
59 } cmp_inst_t;
60 
61 struct kprobe;
62 
63 typedef struct _bundle {
64 	struct {
65 		unsigned long long template : 5;
66 		unsigned long long slot0 : 41;
67 		unsigned long long slot1_p0 : 64-46;
68 	} quad0;
69 	struct {
70 		unsigned long long slot1_p1 : 41 - (64-46);
71 		unsigned long long slot2 : 41;
72 	} quad1;
73 } __attribute__((__aligned__(16)))  bundle_t;
74 
75 struct prev_kprobe {
76 	struct kprobe *kp;
77 	unsigned long status;
78 };
79 
80 #define	MAX_PARAM_RSE_SIZE	(0x60+0x60/0x3f)
81 /* per-cpu kprobe control block */
82 #define ARCH_PREV_KPROBE_SZ 2
83 struct kprobe_ctlblk {
84 	unsigned long kprobe_status;
85 	unsigned long *bsp;
86 	unsigned long cfm;
87 	atomic_t prev_kprobe_index;
88 	struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
89 };
90 
91 #define kretprobe_blacklist_size 0
92 
93 #define SLOT0_OPCODE_SHIFT	(37)
94 #define SLOT1_p1_OPCODE_SHIFT	(37 - (64-46))
95 #define SLOT2_OPCODE_SHIFT 	(37)
96 
97 #define INDIRECT_CALL_OPCODE		(1)
98 #define IP_RELATIVE_CALL_OPCODE		(5)
99 #define IP_RELATIVE_BRANCH_OPCODE	(4)
100 #define IP_RELATIVE_PREDICT_OPCODE	(7)
101 #define LONG_BRANCH_OPCODE		(0xC)
102 #define LONG_CALL_OPCODE		(0xD)
103 #define flush_insn_slot(p)		do { } while (0)
104 
105 typedef struct kprobe_opcode {
106 	bundle_t bundle;
107 } kprobe_opcode_t;
108 
109 /* Architecture specific copy of original instruction*/
110 struct arch_specific_insn {
111 	/* copy of the instruction to be emulated */
112 	kprobe_opcode_t *insn;
113  #define INST_FLAG_FIX_RELATIVE_IP_ADDR		1
114  #define INST_FLAG_FIX_BRANCH_REG		2
115  #define INST_FLAG_BREAK_INST			4
116  #define INST_FLAG_BOOSTABLE			8
117  	unsigned long inst_flag;
118  	unsigned short target_br_reg;
119 	unsigned short slot;
120 };
121 
122 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
123 extern int kprobe_exceptions_notify(struct notifier_block *self,
124 				    unsigned long val, void *data);
125 
126 extern void invalidate_stacked_regs(void);
127 extern void flush_register_stack(void);
128 extern void arch_remove_kprobe(struct kprobe *p);
129 
130 #endif /* CONFIG_KPROBES */
131 #endif /* _ASM_KPROBES_H */
132