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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef _ASM_POWERPC_KPROBES_H
3#define _ASM_POWERPC_KPROBES_H
4
5#include <asm-generic/kprobes.h>
6
7#ifdef __KERNEL__
8/*
9 * Kernel Probes (KProbes)
10 *
11 * Copyright (C) IBM Corporation, 2002, 2004
12 *
13 * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
14 * Probes initial implementation ( includes suggestions from
15 * Rusty Russell).
16 * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
17 * <ananth@in.ibm.com>
18 */
19#include <linux/types.h>
20#include <linux/ptrace.h>
21#include <linux/percpu.h>
22#include <linux/module.h>
23#include <asm/probes.h>
24#include <asm/code-patching.h>
25
26#ifdef CONFIG_KPROBES
27#define __ARCH_WANT_KPROBES_INSN_SLOT
28
29struct pt_regs;
30struct kprobe;
31
32typedef u32 kprobe_opcode_t;
33
34extern kprobe_opcode_t optinsn_slot;
35
36/* Optinsn template address */
37extern kprobe_opcode_t optprobe_template_entry[];
38extern kprobe_opcode_t optprobe_template_op_address[];
39extern kprobe_opcode_t optprobe_template_call_handler[];
40extern kprobe_opcode_t optprobe_template_insn[];
41extern kprobe_opcode_t optprobe_template_call_emulate[];
42extern kprobe_opcode_t optprobe_template_ret[];
43extern kprobe_opcode_t optprobe_template_end[];
44
45/* Fixed instruction size for powerpc */
46#define MAX_INSN_SIZE 2
47#define MAX_OPTIMIZED_LENGTH sizeof(kprobe_opcode_t) /* 4 bytes */
48#define MAX_OPTINSN_SIZE (optprobe_template_end - optprobe_template_entry)
49#define RELATIVEJUMP_SIZE sizeof(kprobe_opcode_t) /* 4 bytes */
50
51#define flush_insn_slot(p) do { } while (0)
52#define kretprobe_blacklist_size 0
53
54void __kretprobe_trampoline(void);
55extern void arch_remove_kprobe(struct kprobe *p);
56
57/* Architecture specific copy of original instruction */
58struct arch_specific_insn {
59 /* copy of original instruction */
60 kprobe_opcode_t *insn;
61 /*
62 * Set in kprobes code, initially to 0. If the instruction can be
63 * eumulated, this is set to 1, if not, to -1.
64 */
65 int boostable;
66};
67
68struct prev_kprobe {
69 struct kprobe *kp;
70 unsigned long status;
71 unsigned long saved_msr;
72};
73
74/* per-cpu kprobe control block */
75struct kprobe_ctlblk {
76 unsigned long kprobe_status;
77 unsigned long kprobe_saved_msr;
78 struct prev_kprobe prev_kprobe;
79};
80
81struct arch_optimized_insn {
82 kprobe_opcode_t copied_insn[1];
83 /* detour buffer */
84 kprobe_opcode_t *insn;
85};
86
87extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
88extern int kprobe_handler(struct pt_regs *regs);
89extern int kprobe_post_handler(struct pt_regs *regs);
90#else
91static inline int kprobe_handler(struct pt_regs *regs) { return 0; }
92static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; }
93#endif /* CONFIG_KPROBES */
94#endif /* __KERNEL__ */
95#endif /* _ASM_POWERPC_KPROBES_H */
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#ifdef CONFIG_KPROBES
36#define __ARCH_WANT_KPROBES_INSN_SLOT
37
38struct pt_regs;
39struct kprobe;
40
41typedef ppc_opcode_t kprobe_opcode_t;
42#define MAX_INSN_SIZE 1
43
44#ifdef PPC64_ELF_ABI_v2
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#elif defined(PPC64_ELF_ABI_v1)
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
96
97#define flush_insn_slot(p) do { } while (0)
98#define kretprobe_blacklist_size 0
99
100void kretprobe_trampoline(void);
101extern void arch_remove_kprobe(struct kprobe *p);
102
103/* Architecture specific copy of original instruction */
104struct arch_specific_insn {
105 /* copy of original instruction */
106 kprobe_opcode_t *insn;
107 /*
108 * Set in kprobes code, initially to 0. If the instruction can be
109 * eumulated, this is set to 1, if not, to -1.
110 */
111 int boostable;
112};
113
114struct prev_kprobe {
115 struct kprobe *kp;
116 unsigned long status;
117 unsigned long saved_msr;
118};
119
120/* per-cpu kprobe control block */
121struct kprobe_ctlblk {
122 unsigned long kprobe_status;
123 unsigned long kprobe_saved_msr;
124 struct pt_regs jprobe_saved_regs;
125 struct prev_kprobe prev_kprobe;
126};
127
128extern int kprobe_exceptions_notify(struct notifier_block *self,
129 unsigned long val, void *data);
130extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
131extern int kprobe_handler(struct pt_regs *regs);
132extern int kprobe_post_handler(struct pt_regs *regs);
133#else
134static inline int kprobe_handler(struct pt_regs *regs) { return 0; }
135static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; }
136#endif /* CONFIG_KPROBES */
137#endif /* __KERNEL__ */
138#endif /* _ASM_POWERPC_KPROBES_H */