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 PPC64_ELF_ABI_v2 44 /* PPC64 ABIv2 needs local entry point */ 45 #define kprobe_lookup_name(name, addr) \ 46 { \ 47 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ 48 if (addr) \ 49 addr = (kprobe_opcode_t *)ppc_function_entry(addr); \ 50 } 51 #elif defined(PPC64_ELF_ABI_v1) 52 /* 53 * 64bit powerpc ABIv1 uses function descriptors: 54 * - Check for the dot variant of the symbol first. 55 * - If that fails, try looking up the symbol provided. 56 * 57 * This ensures we always get to the actual symbol and not the descriptor. 58 * Also handle <module:symbol> format. 59 */ 60 #define kprobe_lookup_name(name, addr) \ 61 { \ 62 char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN]; \ 63 char *modsym; \ 64 bool dot_appended = false; \ 65 if ((modsym = strchr(name, ':')) != NULL) { \ 66 modsym++; \ 67 if (*modsym != '\0' && *modsym != '.') { \ 68 /* Convert to <module:.symbol> */ \ 69 strncpy(dot_name, name, modsym - name); \ 70 dot_name[modsym - name] = '.'; \ 71 dot_name[modsym - name + 1] = '\0'; \ 72 strncat(dot_name, modsym, \ 73 sizeof(dot_name) - (modsym - name) - 2);\ 74 dot_appended = true; \ 75 } else { \ 76 dot_name[0] = '\0'; \ 77 strncat(dot_name, name, sizeof(dot_name) - 1); \ 78 } \ 79 } else if (name[0] != '.') { \ 80 dot_name[0] = '.'; \ 81 dot_name[1] = '\0'; \ 82 strncat(dot_name, name, KSYM_NAME_LEN - 2); \ 83 dot_appended = true; \ 84 } else { \ 85 dot_name[0] = '\0'; \ 86 strncat(dot_name, name, KSYM_NAME_LEN - 1); \ 87 } \ 88 addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \ 89 if (!addr && dot_appended) { \ 90 /* Let's try the original non-dot symbol lookup */ \ 91 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ 92 } \ 93 } 94 #endif 95 96 #define flush_insn_slot(p) do { } while (0) 97 #define kretprobe_blacklist_size 0 98 99 void kretprobe_trampoline(void); 100 extern void arch_remove_kprobe(struct kprobe *p); 101 102 /* Architecture specific copy of original instruction */ 103 struct arch_specific_insn { 104 /* copy of original instruction */ 105 kprobe_opcode_t *insn; 106 /* 107 * Set in kprobes code, initially to 0. If the instruction can be 108 * eumulated, this is set to 1, if not, to -1. 109 */ 110 int boostable; 111 }; 112 113 struct prev_kprobe { 114 struct kprobe *kp; 115 unsigned long status; 116 unsigned long saved_msr; 117 }; 118 119 /* per-cpu kprobe control block */ 120 struct kprobe_ctlblk { 121 unsigned long kprobe_status; 122 unsigned long kprobe_saved_msr; 123 struct pt_regs jprobe_saved_regs; 124 struct prev_kprobe prev_kprobe; 125 }; 126 127 extern int kprobe_exceptions_notify(struct notifier_block *self, 128 unsigned long val, void *data); 129 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 130 #endif /* __KERNEL__ */ 131 #endif /* _ASM_POWERPC_KPROBES_H */ 132