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Diffstat (limited to '')
| -rw-r--r-- | arch/x86/include/asm/kprobes.h | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kprobes.h b/arch/x86/include/asm/kprobes.h new file mode 100644 index 000000000..c8cec1b39 --- /dev/null +++ b/arch/x86/include/asm/kprobes.h @@ -0,0 +1,124 @@ +#ifndef _ASM_X86_KPROBES_H +#define _ASM_X86_KPROBES_H +/* + * 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 + * + * See arch/x86/kernel/kprobes.c for x86 kprobes history. + */ + +#include <asm-generic/kprobes.h> + +#define BREAKPOINT_INSTRUCTION 0xcc + +#ifdef CONFIG_KPROBES +#include <linux/types.h> +#include <linux/ptrace.h> +#include <linux/percpu.h> +#include <asm/insn.h> + +#define __ARCH_WANT_KPROBES_INSN_SLOT + +struct pt_regs; +struct kprobe; + +typedef u8 kprobe_opcode_t; +#define RELATIVEJUMP_OPCODE 0xe9 +#define RELATIVEJUMP_SIZE 5 +#define RELATIVECALL_OPCODE 0xe8 +#define RELATIVE_ADDR_SIZE 4 +#define MAX_STACK_SIZE 64 +#define CUR_STACK_SIZE(ADDR) \ + (current_top_of_stack() - (unsigned long)(ADDR)) +#define MIN_STACK_SIZE(ADDR) \ + (MAX_STACK_SIZE < CUR_STACK_SIZE(ADDR) ? \ + MAX_STACK_SIZE : CUR_STACK_SIZE(ADDR)) + +#define flush_insn_slot(p) do { } while (0) + +/* optinsn template addresses */ +extern __visible kprobe_opcode_t optprobe_template_entry[]; +extern __visible kprobe_opcode_t optprobe_template_val[]; +extern __visible kprobe_opcode_t optprobe_template_call[]; +extern __visible kprobe_opcode_t optprobe_template_end[]; +#define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE) +#define MAX_OPTINSN_SIZE \ + (((unsigned long)optprobe_template_end - \ + (unsigned long)optprobe_template_entry) + \ + MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE) + +extern const int kretprobe_blacklist_size; + +void arch_remove_kprobe(struct kprobe *p); +asmlinkage void kretprobe_trampoline(void); + +extern void arch_kprobe_override_function(struct pt_regs *regs); + +/* Architecture specific copy of original instruction*/ +struct arch_specific_insn { + /* copy of the original instruction */ + kprobe_opcode_t *insn; + /* + * boostable = false: This instruction type is not boostable. + * boostable = true: This instruction has been boosted: we have + * added a relative jump after the instruction copy in insn, + * so no single-step and fixup are needed (unless there's + * a post_handler). + */ + bool boostable; + bool if_modifier; +}; + +struct arch_optimized_insn { + /* copy of the original instructions */ + kprobe_opcode_t copied_insn[RELATIVE_ADDR_SIZE]; + /* detour code buffer */ + kprobe_opcode_t *insn; + /* the size of instructions copied to detour code buffer */ + size_t size; +}; + +/* Return true (!0) if optinsn is prepared for optimization. */ +static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn) +{ + return optinsn->size; +} + +struct prev_kprobe { + struct kprobe *kp; + unsigned long status; + unsigned long old_flags; + unsigned long saved_flags; +}; + +/* per-cpu kprobe control block */ +struct kprobe_ctlblk { + unsigned long kprobe_status; + unsigned long kprobe_old_flags; + unsigned long kprobe_saved_flags; + struct prev_kprobe prev_kprobe; +}; + +extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); +extern int kprobe_exceptions_notify(struct notifier_block *self, + unsigned long val, void *data); +extern int kprobe_int3_handler(struct pt_regs *regs); +extern int kprobe_debug_handler(struct pt_regs *regs); + +#endif /* CONFIG_KPROBES */ +#endif /* _ASM_X86_KPROBES_H */ |