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
29 struct pt_regs;
30 struct kprobe;
31
32 typedef u32 kprobe_opcode_t;
33
34 extern kprobe_opcode_t optinsn_slot;
35
36 /* Optinsn template address */
37 extern kprobe_opcode_t optprobe_template_entry[];
38 extern kprobe_opcode_t optprobe_template_op_address[];
39 extern kprobe_opcode_t optprobe_template_call_handler[];
40 extern kprobe_opcode_t optprobe_template_insn[];
41 extern kprobe_opcode_t optprobe_template_call_emulate[];
42 extern kprobe_opcode_t optprobe_template_ret[];
43 extern 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
54 void __kretprobe_trampoline(void);
55 extern void arch_remove_kprobe(struct kprobe *p);
56
57 /* Architecture specific copy of original instruction */
58 struct 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
68 struct prev_kprobe {
69 struct kprobe *kp;
70 unsigned long status;
71 unsigned long saved_msr;
72 };
73
74 /* per-cpu kprobe control block */
75 struct kprobe_ctlblk {
76 unsigned long kprobe_status;
77 unsigned long kprobe_saved_msr;
78 struct prev_kprobe prev_kprobe;
79 };
80
81 struct arch_optimized_insn {
82 kprobe_opcode_t copied_insn[1];
83 /* detour buffer */
84 kprobe_opcode_t *insn;
85 };
86
87 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
88 extern int kprobe_handler(struct pt_regs *regs);
89 extern int kprobe_post_handler(struct pt_regs *regs);
90 #else
91 static inline int kprobe_handler(struct pt_regs *regs) { return 0; }
92 static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; }
93 #endif /* CONFIG_KPROBES */
94 #endif /* __KERNEL__ */
95 #endif /* _ASM_POWERPC_KPROBES_H */
96
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