aea490299f
The str_pc_offset value is architecturally defined on ARMv7 onwards so we can make it a compile time constant. This means on Thumb kernels the runtime checking code isn't needed, which saves us from having to fix it to work for Thumb. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
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* arch/arm/kernel/kprobes.h
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*
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* Contents moved from arch/arm/include/asm/kprobes.h which is
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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_KERNEL_KPROBES_H
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#define _ARM_KERNEL_KPROBES_H
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/*
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* This undefined instruction must be unique and
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* reserved solely for kprobes' use.
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*/
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#define KPROBE_BREAKPOINT_INSTRUCTION 0xe7f001f8
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enum kprobe_insn {
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INSN_REJECTED,
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INSN_GOOD,
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INSN_GOOD_NO_SLOT
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};
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enum kprobe_insn arm_kprobe_decode_insn(kprobe_opcode_t,
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struct arch_specific_insn *);
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void __init arm_kprobe_decode_init(void);
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extern kprobe_check_cc * const kprobe_condition_checks[16];
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#if __LINUX_ARM_ARCH__ >= 7
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/* str_pc_offset is architecturally defined from ARMv7 onwards */
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#define str_pc_offset 8
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#define find_str_pc_offset()
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#else /* __LINUX_ARM_ARCH__ < 7 */
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/* We need a run-time check to determine str_pc_offset */
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extern int str_pc_offset;
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void __init find_str_pc_offset(void);
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#endif
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/*
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* Test if load/store instructions writeback the address register.
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* if P (bit 24) == 0 or W (bit 21) == 1
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*/
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#define is_writeback(insn) ((insn ^ 0x01000000) & 0x01200000)
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#endif /* _ARM_KERNEL_KPROBES_H */
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