| 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 | |
| 35 | struct pt_regs; |
| 36 | struct kprobe; |
| 37 | |
| 38 | typedef 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 ARCH_SUPPORTS_KRETPROBES |
| 84 | #define flush_insn_slot(p) do { } while (0) |
| 85 | #define kretprobe_blacklist_size 0 |
| 86 | |
| 87 | void kretprobe_trampoline(void); |
| 88 | extern void arch_remove_kprobe(struct kprobe *p); |
| 89 | |
| 90 | /* Architecture specific copy of original instruction */ |
| 91 | struct arch_specific_insn { |
| 92 | /* copy of original instruction */ |
| 93 | kprobe_opcode_t *insn; |
| 94 | /* |
| 95 | * Set in kprobes code, initially to 0. If the instruction can be |
| 96 | * eumulated, this is set to 1, if not, to -1. |
| 97 | */ |
| 98 | int boostable; |
| 99 | }; |
| 100 | |
| 101 | struct prev_kprobe { |
| 102 | struct kprobe *kp; |
| 103 | unsigned long status; |
| 104 | unsigned long saved_msr; |
| 105 | }; |
| 106 | |
| 107 | /* per-cpu kprobe control block */ |
| 108 | struct kprobe_ctlblk { |
| 109 | unsigned long kprobe_status; |
| 110 | unsigned long kprobe_saved_msr; |
| 111 | struct pt_regs jprobe_saved_regs; |
| 112 | struct prev_kprobe prev_kprobe; |
| 113 | }; |
| 114 | |
| 115 | extern int kprobe_exceptions_notify(struct notifier_block *self, |
| 116 | unsigned long val, void *data); |
| 117 | extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); |
| 118 | #endif /* __KERNEL__ */ |
| 119 | #endif /* _ASM_POWERPC_KPROBES_H */ |