1#ifndef _ASM_POWERPC_KPROBES_H
2#define _ASM_POWERPC_KPROBES_H
3#ifdef __KERNEL__
4/*
5 *  Kernel Probes (KProbes)
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 *
23 * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
24 *		Probes initial implementation ( includes suggestions from
25 *		Rusty Russell).
26 * 2004-Nov	Modified for PPC64 by Ananth N Mavinakayanahalli
27 *		<ananth@in.ibm.com>
28 */
29#include <linux/types.h>
30#include <linux/ptrace.h>
31#include <linux/percpu.h>
32#include <asm/probes.h>
33#include <asm/code-patching.h>
34
35#define  __ARCH_WANT_KPROBES_INSN_SLOT
36
37struct pt_regs;
38struct kprobe;
39
40typedef ppc_opcode_t kprobe_opcode_t;
41#define MAX_INSN_SIZE 1
42
43#ifdef CONFIG_PPC64
44#if defined(_CALL_ELF) && _CALL_ELF == 2
45/* PPC64 ABIv2 needs local entry point */
46#define kprobe_lookup_name(name, addr)					\
47{									\
48	addr = (kprobe_opcode_t *)kallsyms_lookup_name(name);		\
49	if (addr)							\
50		addr = (kprobe_opcode_t *)ppc_function_entry(addr);	\
51}
52#else
53/*
54 * 64bit powerpc ABIv1 uses function descriptors:
55 * - Check for the dot variant of the symbol first.
56 * - If that fails, try looking up the symbol provided.
57 *
58 * This ensures we always get to the actual symbol and not the descriptor.
59 * Also handle <module:symbol> format.
60 */
61#define kprobe_lookup_name(name, addr)					\
62{									\
63	char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN];		\
64	char *modsym;							\
65	bool dot_appended = false;					\
66	if ((modsym = strchr(name, ':')) != NULL) {			\
67		modsym++;						\
68		if (*modsym != '\0' && *modsym != '.') {		\
69			/* Convert to <module:.symbol> */		\
70			strncpy(dot_name, name, modsym - name);		\
71			dot_name[modsym - name] = '.';			\
72			dot_name[modsym - name + 1] = '\0';		\
73			strncat(dot_name, modsym,			\
74				sizeof(dot_name) - (modsym - name) - 2);\
75			dot_appended = true;				\
76		} else {						\
77			dot_name[0] = '\0';				\
78			strncat(dot_name, name, sizeof(dot_name) - 1);	\
79		}							\
80	} else if (name[0] != '.') {					\
81		dot_name[0] = '.';					\
82		dot_name[1] = '\0';					\
83		strncat(dot_name, name, KSYM_NAME_LEN - 2);		\
84		dot_appended = true;					\
85	} else {							\
86		dot_name[0] = '\0';					\
87		strncat(dot_name, name, KSYM_NAME_LEN - 1);		\
88	}								\
89	addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name);	\
90	if (!addr && dot_appended) {					\
91		/* Let's try the original non-dot symbol lookup	*/	\
92		addr = (kprobe_opcode_t *)kallsyms_lookup_name(name);	\
93	}								\
94}
95#endif /* defined(_CALL_ELF) && _CALL_ELF == 2 */
96#endif /* CONFIG_PPC64 */
97
98#define flush_insn_slot(p)	do { } while (0)
99#define kretprobe_blacklist_size 0
100
101void kretprobe_trampoline(void);
102extern void arch_remove_kprobe(struct kprobe *p);
103
104/* Architecture specific copy of original instruction */
105struct arch_specific_insn {
106	/* copy of original instruction */
107	kprobe_opcode_t *insn;
108	/*
109	 * Set in kprobes code, initially to 0. If the instruction can be
110	 * eumulated, this is set to 1, if not, to -1.
111	 */
112	int boostable;
113};
114
115struct prev_kprobe {
116	struct kprobe *kp;
117	unsigned long status;
118	unsigned long saved_msr;
119};
120
121/* per-cpu kprobe control block */
122struct kprobe_ctlblk {
123	unsigned long kprobe_status;
124	unsigned long kprobe_saved_msr;
125	struct pt_regs jprobe_saved_regs;
126	struct prev_kprobe prev_kprobe;
127};
128
129extern int kprobe_exceptions_notify(struct notifier_block *self,
130					unsigned long val, void *data);
131extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
132#endif /* __KERNEL__ */
133#endif	/* _ASM_POWERPC_KPROBES_H */
134