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4ba069b8 MG |
1 | #ifndef _ASM_S390_KPROBES_H |
2 | #define _ASM_S390_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 | * | |
a53c8fab | 20 | * Copyright IBM Corp. 2002, 2006 |
4ba069b8 MG |
21 | * |
22 | * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel | |
23 | * Probes initial implementation ( includes suggestions from | |
24 | * Rusty Russell). | |
25 | * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli | |
26 | * <ananth@in.ibm.com> | |
27 | * 2005-Dec Used as a template for s390 by Mike Grundy | |
28 | * <grundym@us.ibm.com> | |
29 | */ | |
db55947d | 30 | #include <linux/types.h> |
7d134b2c LR |
31 | #include <asm-generic/kprobes.h> |
32 | ||
33 | #define BREAKPOINT_INSTRUCTION 0x0002 | |
34 | ||
db55947d HC |
35 | #define FIXUP_PSW_NORMAL 0x08 |
36 | #define FIXUP_BRANCH_NOT_TAKEN 0x04 | |
37 | #define FIXUP_RETURN_REGISTER 0x02 | |
38 | #define FIXUP_NOT_REQUIRED 0x01 | |
39 | ||
40 | int probe_is_prohibited_opcode(u16 *insn); | |
41 | int probe_get_fixup_type(u16 *insn); | |
42 | int probe_is_insn_relative_long(u16 *insn); | |
43 | ||
7d134b2c | 44 | #ifdef CONFIG_KPROBES |
4ba069b8 MG |
45 | #include <linux/ptrace.h> |
46 | #include <linux/percpu.h> | |
68db0cf1 | 47 | #include <linux/sched/task_stack.h> |
4ba069b8 | 48 | |
63c40436 HC |
49 | #define __ARCH_WANT_KPROBES_INSN_SLOT |
50 | ||
4ba069b8 MG |
51 | struct pt_regs; |
52 | struct kprobe; | |
53 | ||
54 | typedef u16 kprobe_opcode_t; | |
4ba069b8 MG |
55 | |
56 | /* Maximum instruction size is 3 (16bit) halfwords: */ | |
57 | #define MAX_INSN_SIZE 0x0003 | |
58 | #define MAX_STACK_SIZE 64 | |
59 | #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ | |
c3bdf2e1 | 60 | (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \ |
4ba069b8 | 61 | ? (MAX_STACK_SIZE) \ |
c3bdf2e1 | 62 | : (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) |
4ba069b8 | 63 | |
f438d914 | 64 | #define kretprobe_blacklist_size 0 |
4ba069b8 MG |
65 | |
66 | #define KPROBE_SWAP_INST 0x10 | |
67 | ||
4ba069b8 MG |
68 | /* Architecture specific copy of original instruction */ |
69 | struct arch_specific_insn { | |
70 | /* copy of original instruction */ | |
63c40436 | 71 | kprobe_opcode_t *insn; |
c933146a | 72 | unsigned int is_ftrace_insn : 1; |
4ba069b8 MG |
73 | }; |
74 | ||
4ba069b8 MG |
75 | struct prev_kprobe { |
76 | struct kprobe *kp; | |
77 | unsigned long status; | |
4ba069b8 MG |
78 | }; |
79 | ||
80 | /* per-cpu kprobe control block */ | |
81 | struct kprobe_ctlblk { | |
82 | unsigned long kprobe_status; | |
83 | unsigned long kprobe_saved_imask; | |
84 | unsigned long kprobe_saved_ctl[3]; | |
4ba069b8 | 85 | struct prev_kprobe prev_kprobe; |
92b8cbf1 | 86 | struct pt_regs jprobe_saved_regs; |
4ba069b8 MG |
87 | kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; |
88 | }; | |
89 | ||
90 | void arch_remove_kprobe(struct kprobe *p); | |
91 | void kretprobe_trampoline(void); | |
4ba069b8 | 92 | |
33464e3b CH |
93 | int kprobe_fault_handler(struct pt_regs *regs, int trapnr); |
94 | int kprobe_exceptions_notify(struct notifier_block *self, | |
95 | unsigned long val, void *data); | |
96 | ||
4ba069b8 MG |
97 | #define flush_insn_slot(p) do { } while (0) |
98 | ||
7d134b2c | 99 | #endif /* CONFIG_KPROBES */ |
4ba069b8 | 100 | #endif /* _ASM_S390_KPROBES_H */ |