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