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 <linux/module.h> 33 #include <asm/probes.h> 34 #include <asm/code-patching.h> 35 36 #ifdef CONFIG_KPROBES 37 #define __ARCH_WANT_KPROBES_INSN_SLOT 38 39 struct pt_regs; 40 struct kprobe; 41 42 typedef ppc_opcode_t kprobe_opcode_t; 43 #define MAX_INSN_SIZE 1 44 45 #ifdef PPC64_ELF_ABI_v2 46 /* PPC64 ABIv2 needs local entry point */ 47 #define kprobe_lookup_name(name, addr) \ 48 { \ 49 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ 50 if (addr) \ 51 addr = (kprobe_opcode_t *)ppc_function_entry(addr); \ 52 } 53 #elif defined(PPC64_ELF_ABI_v1) 54 /* 55 * 64bit powerpc ABIv1 uses function descriptors: 56 * - Check for the dot variant of the symbol first. 57 * - If that fails, try looking up the symbol provided. 58 * 59 * This ensures we always get to the actual symbol and not the descriptor. 60 * Also handle <module:symbol> format. 61 */ 62 #define kprobe_lookup_name(name, addr) \ 63 { \ 64 char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN]; \ 65 const char *modsym; \ 66 bool dot_appended = false; \ 67 if ((modsym = strchr(name, ':')) != NULL) { \ 68 modsym++; \ 69 if (*modsym != '\0' && *modsym != '.') { \ 70 /* Convert to <module:.symbol> */ \ 71 strncpy(dot_name, name, modsym - name); \ 72 dot_name[modsym - name] = '.'; \ 73 dot_name[modsym - name + 1] = '\0'; \ 74 strncat(dot_name, modsym, \ 75 sizeof(dot_name) - (modsym - name) - 2);\ 76 dot_appended = true; \ 77 } else { \ 78 dot_name[0] = '\0'; \ 79 strncat(dot_name, name, sizeof(dot_name) - 1); \ 80 } \ 81 } else if (name[0] != '.') { \ 82 dot_name[0] = '.'; \ 83 dot_name[1] = '\0'; \ 84 strncat(dot_name, name, KSYM_NAME_LEN - 2); \ 85 dot_appended = true; \ 86 } else { \ 87 dot_name[0] = '\0'; \ 88 strncat(dot_name, name, KSYM_NAME_LEN - 1); \ 89 } \ 90 addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \ 91 if (!addr && dot_appended) { \ 92 /* Let's try the original non-dot symbol lookup */ \ 93 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ 94 } \ 95 } 96 #endif 97 98 #define flush_insn_slot(p) do { } while (0) 99 #define kretprobe_blacklist_size 0 100 101 void kretprobe_trampoline(void); 102 extern void arch_remove_kprobe(struct kprobe *p); 103 104 /* Architecture specific copy of original instruction */ 105 struct arch_specific_insn { 106 /* copy of original instruction */ 107 kprobe_opcode_t *insn; 108 /* 109 * Set in kprobes code, initially to 0. If the instruction can be 110 * eumulated, this is set to 1, if not, to -1. 111 */ 112 int boostable; 113 }; 114 115 struct prev_kprobe { 116 struct kprobe *kp; 117 unsigned long status; 118 unsigned long saved_msr; 119 }; 120 121 /* per-cpu kprobe control block */ 122 struct kprobe_ctlblk { 123 unsigned long kprobe_status; 124 unsigned long kprobe_saved_msr; 125 struct pt_regs jprobe_saved_regs; 126 struct prev_kprobe prev_kprobe; 127 }; 128 129 extern int kprobe_exceptions_notify(struct notifier_block *self, 130 unsigned long val, void *data); 131 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 132 extern int kprobe_handler(struct pt_regs *regs); 133 extern int kprobe_post_handler(struct pt_regs *regs); 134 #else 135 static inline int kprobe_handler(struct pt_regs *regs) { return 0; } 136 static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; } 137 #endif /* CONFIG_KPROBES */ 138 #endif /* __KERNEL__ */ 139 #endif /* _ASM_POWERPC_KPROBES_H */ 140