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0b73214f | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
4ba069b8 MG |
2 | #ifndef _ASM_S390_KPROBES_H |
3 | #define _ASM_S390_KPROBES_H | |
4 | /* | |
5 | * Kernel Probes (KProbes) | |
6 | * | |
a53c8fab | 7 | * Copyright IBM Corp. 2002, 2006 |
4ba069b8 MG |
8 | * |
9 | * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel | |
10 | * Probes initial implementation ( includes suggestions from | |
11 | * Rusty Russell). | |
12 | * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli | |
13 | * <ananth@in.ibm.com> | |
14 | * 2005-Dec Used as a template for s390 by Mike Grundy | |
15 | * <grundym@us.ibm.com> | |
16 | */ | |
db55947d | 17 | #include <linux/types.h> |
7d134b2c LR |
18 | #include <asm-generic/kprobes.h> |
19 | ||
20 | #define BREAKPOINT_INSTRUCTION 0x0002 | |
21 | ||
db55947d HC |
22 | #define FIXUP_PSW_NORMAL 0x08 |
23 | #define FIXUP_BRANCH_NOT_TAKEN 0x04 | |
24 | #define FIXUP_RETURN_REGISTER 0x02 | |
25 | #define FIXUP_NOT_REQUIRED 0x01 | |
26 | ||
27 | int probe_is_prohibited_opcode(u16 *insn); | |
28 | int probe_get_fixup_type(u16 *insn); | |
29 | int probe_is_insn_relative_long(u16 *insn); | |
30 | ||
7d134b2c | 31 | #ifdef CONFIG_KPROBES |
4ba069b8 MG |
32 | #include <linux/ptrace.h> |
33 | #include <linux/percpu.h> | |
68db0cf1 | 34 | #include <linux/sched/task_stack.h> |
4ba069b8 | 35 | |
63c40436 HC |
36 | #define __ARCH_WANT_KPROBES_INSN_SLOT |
37 | ||
4ba069b8 MG |
38 | struct pt_regs; |
39 | struct kprobe; | |
40 | ||
41 | typedef u16 kprobe_opcode_t; | |
4ba069b8 MG |
42 | |
43 | /* Maximum instruction size is 3 (16bit) halfwords: */ | |
44 | #define MAX_INSN_SIZE 0x0003 | |
45 | #define MAX_STACK_SIZE 64 | |
46 | #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ | |
c3bdf2e1 | 47 | (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \ |
4ba069b8 | 48 | ? (MAX_STACK_SIZE) \ |
c3bdf2e1 | 49 | : (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) |
4ba069b8 | 50 | |
f438d914 | 51 | #define kretprobe_blacklist_size 0 |
4ba069b8 | 52 | |
4ba069b8 MG |
53 | /* Architecture specific copy of original instruction */ |
54 | struct arch_specific_insn { | |
55 | /* copy of original instruction */ | |
63c40436 | 56 | kprobe_opcode_t *insn; |
c933146a | 57 | unsigned int is_ftrace_insn : 1; |
4ba069b8 MG |
58 | }; |
59 | ||
4ba069b8 MG |
60 | struct prev_kprobe { |
61 | struct kprobe *kp; | |
62 | unsigned long status; | |
4ba069b8 MG |
63 | }; |
64 | ||
65 | /* per-cpu kprobe control block */ | |
66 | struct kprobe_ctlblk { | |
67 | unsigned long kprobe_status; | |
68 | unsigned long kprobe_saved_imask; | |
69 | unsigned long kprobe_saved_ctl[3]; | |
4ba069b8 | 70 | struct prev_kprobe prev_kprobe; |
92b8cbf1 | 71 | struct pt_regs jprobe_saved_regs; |
4ba069b8 MG |
72 | kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; |
73 | }; | |
74 | ||
75 | void arch_remove_kprobe(struct kprobe *p); | |
76 | void kretprobe_trampoline(void); | |
4ba069b8 | 77 | |
33464e3b CH |
78 | int kprobe_fault_handler(struct pt_regs *regs, int trapnr); |
79 | int kprobe_exceptions_notify(struct notifier_block *self, | |
80 | unsigned long val, void *data); | |
81 | ||
4ba069b8 MG |
82 | #define flush_insn_slot(p) do { } while (0) |
83 | ||
7d134b2c | 84 | #endif /* CONFIG_KPROBES */ |
4ba069b8 | 85 | #endif /* _ASM_S390_KPROBES_H */ |