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 33#define __ARCH_WANT_KPROBES_INSN_SLOT 34 35struct pt_regs; 36struct kprobe; 37 38typedef unsigned int kprobe_opcode_t; 39#define BREAKPOINT_INSTRUCTION 0x7fe00008 /* trap */ 40#define MAX_INSN_SIZE 1 41 42#define IS_TW(instr) (((instr) & 0xfc0007fe) == 0x7c000008) 43#define IS_TD(instr) (((instr) & 0xfc0007fe) == 0x7c000088) 44#define IS_TDI(instr) (((instr) & 0xfc000000) == 0x08000000) 45#define IS_TWI(instr) (((instr) & 0xfc000000) == 0x0c000000) 46 47#ifdef CONFIG_PPC64 48/* 49 * 64bit powerpc uses function descriptors. 50 * Handle cases where: 51 * - User passes a <.symbol> or <module:.symbol> 52 * - User passes a <symbol> or <module:symbol> 53 * - User passes a non-existant symbol, kallsyms_lookup_name 54 * returns 0. Don't deref the NULL pointer in that case 55 */ 56#define kprobe_lookup_name(name, addr) \ 57{ \ 58 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ 59 if (addr) { \ 60 char *colon; \ 61 if ((colon = strchr(name, ':')) != NULL) { \ 62 colon++; \ 63 if (*colon != '\0' && *colon != '.') \ 64 addr = *(kprobe_opcode_t **)addr; \ 65 } else if (name[0] != '.') \ 66 addr = *(kprobe_opcode_t **)addr; \ 67 } else { \ 68 char dot_name[KSYM_NAME_LEN]; \ 69 dot_name[0] = '.'; \ 70 dot_name[1] = '\0'; \ 71 strncat(dot_name, name, KSYM_NAME_LEN - 2); \ 72 addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \ 73 } \ 74} 75 76#define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \ 77 IS_TWI(instr) || IS_TDI(instr)) 78#else 79/* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */ 80#define is_trap(instr) (IS_TW(instr) || IS_TWI(instr)) 81#endif 82 83#define flush_insn_slot(p) do { } while (0) 84#define kretprobe_blacklist_size 0 85 86void kretprobe_trampoline(void); 87extern void arch_remove_kprobe(struct kprobe *p); 88 89/* Architecture specific copy of original instruction */ 90struct arch_specific_insn { 91 /* copy of original instruction */ 92 kprobe_opcode_t *insn; 93 /* 94 * Set in kprobes code, initially to 0. If the instruction can be 95 * eumulated, this is set to 1, if not, to -1. 96 */ 97 int boostable; 98}; 99 100struct prev_kprobe { 101 struct kprobe *kp; 102 unsigned long status; 103 unsigned long saved_msr; 104}; 105 106/* per-cpu kprobe control block */ 107struct kprobe_ctlblk { 108 unsigned long kprobe_status; 109 unsigned long kprobe_saved_msr; 110 struct pt_regs jprobe_saved_regs; 111 struct prev_kprobe prev_kprobe; 112}; 113 114extern int kprobe_exceptions_notify(struct notifier_block *self, 115 unsigned long val, void *data); 116extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 117#endif /* __KERNEL__ */ 118#endif /* _ASM_POWERPC_KPROBES_H */ 119