#ifndef _ASM_POWERPC_KPROBES_H #define _ASM_POWERPC_KPROBES_H #ifdef __KERNEL__ /* * Kernel Probes (KProbes) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Copyright (C) IBM Corporation, 2002, 2004 * * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel * Probes initial implementation ( includes suggestions from * Rusty Russell). * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli * <ananth@in.ibm.com> */ #include <linux/types.h> #include <linux/ptrace.h> #include <linux/percpu.h> #include <asm/probes.h> #define __ARCH_WANT_KPROBES_INSN_SLOT struct pt_regs; struct kprobe; typedef ppc_opcode_t kprobe_opcode_t; #define MAX_INSN_SIZE 1 #ifdef CONFIG_PPC64 /* * 64bit powerpc uses function descriptors. * Handle cases where: * - User passes a <.symbol> or <module:.symbol> * - User passes a <symbol> or <module:symbol> * - User passes a non-existent symbol, kallsyms_lookup_name * returns 0. Don't deref the NULL pointer in that case */ #define kprobe_lookup_name(name, addr) \ { \ addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ if (addr) { \ char *colon; \ if ((colon = strchr(name, ':')) != NULL) { \ colon++; \ if (*colon != '\0' && *colon != '.') \ addr = *(kprobe_opcode_t **)addr; \ } else if (name[0] != '.') \ addr = *(kprobe_opcode_t **)addr; \ } else { \ char dot_name[KSYM_NAME_LEN]; \ dot_name[0] = '.'; \ dot_name[1] = '\0'; \ strncat(dot_name, name, KSYM_NAME_LEN - 2); \ addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \ } \ } #endif #define flush_insn_slot(p) do { } while (0) #define kretprobe_blacklist_size 0 void kretprobe_trampoline(void); extern void arch_remove_kprobe(struct kprobe *p); /* Architecture specific copy of original instruction */ struct arch_specific_insn { /* copy of original instruction */ kprobe_opcode_t *insn; /* * Set in kprobes code, initially to 0. If the instruction can be * eumulated, this is set to 1, if not, to -1. */ int boostable; }; struct prev_kprobe { struct kprobe *kp; unsigned long status; unsigned long saved_msr; }; /* per-cpu kprobe control block */ struct kprobe_ctlblk { unsigned long kprobe_status; unsigned long kprobe_saved_msr; struct pt_regs jprobe_saved_regs; struct prev_kprobe prev_kprobe; }; extern int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, void *data); extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_KPROBES_H */