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https://github.com/torvalds/linux
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bfc9657d75
This patch removes software emulation or simulation for most of probed
instructions. If the instruction doesn't use PC relative addressing,
it will be translated into following instructions in the restore code
in code template:
ldmia {r0 - r14} // restore all instruction except PC
<instruction> // direct execute the probed instruction
b next_insn // branch to next instruction.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/*
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* arch/arm/include/asm/kprobes.h
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*
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* Copyright (C) 2006, 2007 Motorola Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#ifndef _ARM_KPROBES_H
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#define _ARM_KPROBES_H
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/notifier.h>
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#define __ARCH_WANT_KPROBES_INSN_SLOT
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#define MAX_INSN_SIZE 2
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#define flush_insn_slot(p) do { } while (0)
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#define kretprobe_blacklist_size 0
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typedef u32 kprobe_opcode_t;
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struct kprobe;
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#include <asm/probes.h>
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#define arch_specific_insn arch_probes_insn
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struct prev_kprobe {
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struct kprobe *kp;
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unsigned int status;
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};
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/* per-cpu kprobe control block */
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struct kprobe_ctlblk {
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unsigned int kprobe_status;
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struct prev_kprobe prev_kprobe;
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struct pt_regs jprobe_saved_regs;
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char jprobes_stack[MAX_STACK_SIZE];
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};
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void arch_remove_kprobe(struct kprobe *);
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int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
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int kprobe_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data);
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/* optinsn template addresses */
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extern __visible kprobe_opcode_t optprobe_template_entry;
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extern __visible kprobe_opcode_t optprobe_template_val;
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extern __visible kprobe_opcode_t optprobe_template_call;
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extern __visible kprobe_opcode_t optprobe_template_end;
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extern __visible kprobe_opcode_t optprobe_template_sub_sp;
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extern __visible kprobe_opcode_t optprobe_template_add_sp;
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extern __visible kprobe_opcode_t optprobe_template_restore_begin;
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extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn;
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extern __visible kprobe_opcode_t optprobe_template_restore_end;
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#define MAX_OPTIMIZED_LENGTH 4
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#define MAX_OPTINSN_SIZE \
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((unsigned long)&optprobe_template_end - \
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(unsigned long)&optprobe_template_entry)
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#define RELATIVEJUMP_SIZE 4
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struct arch_optimized_insn {
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/*
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* copy of the original instructions.
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* Different from x86, ARM kprobe_opcode_t is u32.
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*/
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#define MAX_COPIED_INSN DIV_ROUND_UP(RELATIVEJUMP_SIZE, sizeof(kprobe_opcode_t))
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kprobe_opcode_t copied_insn[MAX_COPIED_INSN];
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/* detour code buffer */
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kprobe_opcode_t *insn;
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/*
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* We always copy one instruction on ARM,
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* so size will always be 4, and unlike x86, there is no
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* need for a size field.
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*/
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};
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#endif /* _ARM_KPROBES_H */
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