| Michael Grundy | 4ba069b | 2006-09-20 15:58:39 +0200 | [diff] [blame] | 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 | * |
| 20 | * Copyright (C) IBM Corporation, 2002, 2006 |
| 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 | */ |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/ptrace.h> |
| 32 | #include <linux/percpu.h> |
| 33 | |
| 34 | #define __ARCH_WANT_KPROBES_INSN_SLOT |
| 35 | struct pt_regs; |
| 36 | struct kprobe; |
| 37 | |
| 38 | typedef u16 kprobe_opcode_t; |
| 39 | #define BREAKPOINT_INSTRUCTION 0x0002 |
| 40 | |
| 41 | /* Maximum instruction size is 3 (16bit) halfwords: */ |
| 42 | #define MAX_INSN_SIZE 0x0003 |
| 43 | #define MAX_STACK_SIZE 64 |
| 44 | #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ |
| 45 | (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \ |
| 46 | ? (MAX_STACK_SIZE) \ |
| 47 | : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) |
| 48 | |
| 49 | #define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)(pentry) |
| 50 | |
| 51 | #define ARCH_SUPPORTS_KRETPROBES |
| 52 | #define ARCH_INACTIVE_KPROBE_COUNT 0 |
| 53 | |
| 54 | #define KPROBE_SWAP_INST 0x10 |
| 55 | |
| 56 | #define FIXUP_PSW_NORMAL 0x08 |
| 57 | #define FIXUP_BRANCH_NOT_TAKEN 0x04 |
| 58 | #define FIXUP_RETURN_REGISTER 0x02 |
| 59 | #define FIXUP_NOT_REQUIRED 0x01 |
| 60 | |
| 61 | /* Architecture specific copy of original instruction */ |
| 62 | struct arch_specific_insn { |
| 63 | /* copy of original instruction */ |
| 64 | kprobe_opcode_t *insn; |
| 65 | int fixup; |
| 66 | int ilen; |
| 67 | int reg; |
| 68 | }; |
| 69 | |
| 70 | struct ins_replace_args { |
| 71 | kprobe_opcode_t *ptr; |
| 72 | kprobe_opcode_t old; |
| 73 | kprobe_opcode_t new; |
| 74 | }; |
| 75 | struct prev_kprobe { |
| 76 | struct kprobe *kp; |
| 77 | unsigned long status; |
| 78 | unsigned long saved_psw; |
| 79 | unsigned long kprobe_saved_imask; |
| 80 | unsigned long kprobe_saved_ctl[3]; |
| 81 | }; |
| 82 | |
| 83 | /* per-cpu kprobe control block */ |
| 84 | struct kprobe_ctlblk { |
| 85 | unsigned long kprobe_status; |
| 86 | unsigned long kprobe_saved_imask; |
| 87 | unsigned long kprobe_saved_ctl[3]; |
| 88 | struct pt_regs jprobe_saved_regs; |
| 89 | unsigned long jprobe_saved_r14; |
| 90 | unsigned long jprobe_saved_r15; |
| 91 | struct prev_kprobe prev_kprobe; |
| 92 | kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; |
| 93 | }; |
| 94 | |
| 95 | void arch_remove_kprobe(struct kprobe *p); |
| 96 | void kretprobe_trampoline(void); |
| 97 | int is_prohibited_opcode(kprobe_opcode_t *instruction); |
| 98 | void get_instruction_type(struct arch_specific_insn *ainsn); |
| 99 | |
| 100 | #define flush_insn_slot(p) do { } while (0) |
| 101 | |
| 102 | #endif /* _ASM_S390_KPROBES_H */ |
| 103 | |
| 104 | #ifdef CONFIG_KPROBES |
| 105 | |
| 106 | extern int kprobe_exceptions_notify(struct notifier_block *self, |
| 107 | unsigned long val, void *data); |
| 108 | #else /* !CONFIG_KPROBES */ |
| 109 | static inline int kprobe_exceptions_notify(struct notifier_block *self, |
| 110 | unsigned long val, void *data) |
| 111 | { |
| 112 | return 0; |
| 113 | } |
| 114 | #endif |