1 #ifndef _ASM_POWERPC_KPROBES_H 2 #define _ASM_POWERPC_KPROBES_H 3 4 #include <asm-generic/kprobes.h> 5 6 #ifdef __KERNEL__ 7 /* 8 * Kernel Probes (KProbes) 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23 * 24 * Copyright (C) IBM Corporation, 2002, 2004 25 * 26 * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel 27 * Probes initial implementation ( includes suggestions from 28 * Rusty Russell). 29 * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli 30 * <ananth@in.ibm.com> 31 */ 32 #include <linux/types.h> 33 #include <linux/ptrace.h> 34 #include <linux/percpu.h> 35 #include <linux/module.h> 36 #include <asm/probes.h> 37 #include <asm/code-patching.h> 38 39 #ifdef CONFIG_KPROBES 40 #define __ARCH_WANT_KPROBES_INSN_SLOT 41 42 struct pt_regs; 43 struct kprobe; 44 45 typedef ppc_opcode_t kprobe_opcode_t; 46 47 extern kprobe_opcode_t optinsn_slot; 48 49 /* Optinsn template address */ 50 extern kprobe_opcode_t optprobe_template_entry[]; 51 extern kprobe_opcode_t optprobe_template_op_address[]; 52 extern kprobe_opcode_t optprobe_template_call_handler[]; 53 extern kprobe_opcode_t optprobe_template_insn[]; 54 extern kprobe_opcode_t optprobe_template_call_emulate[]; 55 extern kprobe_opcode_t optprobe_template_ret[]; 56 extern kprobe_opcode_t optprobe_template_end[]; 57 58 /* Fixed instruction size for powerpc */ 59 #define MAX_INSN_SIZE 1 60 #define MAX_OPTIMIZED_LENGTH sizeof(kprobe_opcode_t) /* 4 bytes */ 61 #define MAX_OPTINSN_SIZE (optprobe_template_end - optprobe_template_entry) 62 #define RELATIVEJUMP_SIZE sizeof(kprobe_opcode_t) /* 4 bytes */ 63 64 #define flush_insn_slot(p) do { } while (0) 65 #define kretprobe_blacklist_size 0 66 67 void kretprobe_trampoline(void); 68 extern void arch_remove_kprobe(struct kprobe *p); 69 70 /* Architecture specific copy of original instruction */ 71 struct arch_specific_insn { 72 /* copy of original instruction */ 73 kprobe_opcode_t *insn; 74 /* 75 * Set in kprobes code, initially to 0. If the instruction can be 76 * eumulated, this is set to 1, if not, to -1. 77 */ 78 int boostable; 79 }; 80 81 struct prev_kprobe { 82 struct kprobe *kp; 83 unsigned long status; 84 unsigned long saved_msr; 85 }; 86 87 /* per-cpu kprobe control block */ 88 struct kprobe_ctlblk { 89 unsigned long kprobe_status; 90 unsigned long kprobe_saved_msr; 91 struct prev_kprobe prev_kprobe; 92 }; 93 94 struct arch_optimized_insn { 95 kprobe_opcode_t copied_insn[1]; 96 /* detour buffer */ 97 kprobe_opcode_t *insn; 98 }; 99 100 extern int kprobe_exceptions_notify(struct notifier_block *self, 101 unsigned long val, void *data); 102 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 103 extern int kprobe_handler(struct pt_regs *regs); 104 extern int kprobe_post_handler(struct pt_regs *regs); 105 #ifdef CONFIG_KPROBES_ON_FTRACE 106 extern int skip_singlestep(struct kprobe *p, struct pt_regs *regs, 107 struct kprobe_ctlblk *kcb); 108 #else 109 static inline int skip_singlestep(struct kprobe *p, struct pt_regs *regs, 110 struct kprobe_ctlblk *kcb) 111 { 112 return 0; 113 } 114 #endif 115 #else 116 static inline int kprobe_handler(struct pt_regs *regs) { return 0; } 117 static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; } 118 #endif /* CONFIG_KPROBES */ 119 #endif /* __KERNEL__ */ 120 #endif /* _ASM_POWERPC_KPROBES_H */ 121