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