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Kprobes needs simulation of instructions that cannot be stepped from a different memory location, e.g.: those instructions that uses PC-relative addressing. In simulation, the behaviour of the instruction is implemented using a copy of pt_regs. The following instruction categories are simulated: - All branching instructions(conditional, register, and immediate) - Literal access instructions(load-literal, adr/adrp) Conditional execution is limited to branching instructions in ARM v8. If conditions at PSTATE do not match the condition fields of opcode, the instruction is effectively NOP. Thanks to Will Cohen for assorted suggested changes. Signed-off-by: Sandeepa Prabhu <sandeepa.s.prabhu@gmail.com> Signed-off-by: William Cohen <wcohen@redhat.com> Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> [catalin.marinas@arm.com: removed linux/module.h include] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
36 lines
980 B
C
36 lines
980 B
C
/*
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* arch/arm64/include/asm/probes.h
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*
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* Copyright (C) 2013 Linaro Limited
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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_PROBES_H
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#define _ARM_PROBES_H
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#include <asm/opcodes.h>
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struct kprobe;
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struct arch_specific_insn;
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typedef u32 kprobe_opcode_t;
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typedef void (kprobes_handler_t) (u32 opcode, long addr, struct pt_regs *);
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/* architecture specific copy of original instruction */
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struct arch_specific_insn {
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kprobe_opcode_t *insn;
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pstate_check_t *pstate_cc;
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kprobes_handler_t *handler;
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/* restore address after step xol */
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unsigned long restore;
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};
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#endif
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