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Diffstat (limited to 'arch/powerpc/include/asm/kprobes.h')
| -rw-r--r-- | arch/powerpc/include/asm/kprobes.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kprobes.h b/arch/powerpc/include/asm/kprobes.h new file mode 100644 index 000000000..039b583db --- /dev/null +++ b/arch/powerpc/include/asm/kprobes.h @@ -0,0 +1,133 @@ +#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> +#include <asm/code-patching.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 +#if defined(_CALL_ELF) && _CALL_ELF == 2 +/* PPC64 ABIv2 needs local entry point */ +#define kprobe_lookup_name(name, addr) \ +{ \ + addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ + if (addr) \ + addr = (kprobe_opcode_t *)ppc_function_entry(addr); \ +} +#else +/* + * 64bit powerpc ABIv1 uses function descriptors: + * - Check for the dot variant of the symbol first. + * - If that fails, try looking up the symbol provided. + * + * This ensures we always get to the actual symbol and not the descriptor. + * Also handle <module:symbol> format. + */ +#define kprobe_lookup_name(name, addr) \ +{ \ + char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN]; \ + char *modsym; \ + bool dot_appended = false; \ + if ((modsym = strchr(name, ':')) != NULL) { \ + modsym++; \ + if (*modsym != '\0' && *modsym != '.') { \ + /* Convert to <module:.symbol> */ \ + strncpy(dot_name, name, modsym - name); \ + dot_name[modsym - name] = '.'; \ + dot_name[modsym - name + 1] = '\0'; \ + strncat(dot_name, modsym, \ + sizeof(dot_name) - (modsym - name) - 2);\ + dot_appended = true; \ + } else { \ + dot_name[0] = '\0'; \ + strncat(dot_name, name, sizeof(dot_name) - 1); \ + } \ + } else if (name[0] != '.') { \ + dot_name[0] = '.'; \ + dot_name[1] = '\0'; \ + strncat(dot_name, name, KSYM_NAME_LEN - 2); \ + dot_appended = true; \ + } else { \ + dot_name[0] = '\0'; \ + strncat(dot_name, name, KSYM_NAME_LEN - 1); \ + } \ + addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \ + if (!addr && dot_appended) { \ + /* Let's try the original non-dot symbol lookup */ \ + addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ + } \ +} +#endif /* defined(_CALL_ELF) && _CALL_ELF == 2 */ +#endif /* CONFIG_PPC64 */ + +#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 */ |