39a67d49ba
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>
29 lines
1.2 KiB
C
29 lines
1.2 KiB
C
/*
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* arch/arm64/kernel/probes/simulate-insn.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_KERNEL_KPROBES_SIMULATE_INSN_H
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#define _ARM_KERNEL_KPROBES_SIMULATE_INSN_H
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void simulate_adr_adrp(u32 opcode, long addr, struct pt_regs *regs);
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void simulate_b_bl(u32 opcode, long addr, struct pt_regs *regs);
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void simulate_b_cond(u32 opcode, long addr, struct pt_regs *regs);
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void simulate_br_blr_ret(u32 opcode, long addr, struct pt_regs *regs);
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void simulate_cbz_cbnz(u32 opcode, long addr, struct pt_regs *regs);
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void simulate_tbz_tbnz(u32 opcode, long addr, struct pt_regs *regs);
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void simulate_ldr_literal(u32 opcode, long addr, struct pt_regs *regs);
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void simulate_ldrsw_literal(u32 opcode, long addr, struct pt_regs *regs);
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#endif /* _ARM_KERNEL_KPROBES_SIMULATE_INSN_H */
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