uprobes.h

 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2#ifndef _ASM_UPROBES_H
 3#define _ASM_UPROBES_H
 4/*
 5 * User-space Probes (UProbes) for x86
 6 *
 7 * Copyright (C) IBM Corporation, 2008-2011
 8 * Authors:
 9 *	Srikar Dronamraju
10 *	Jim Keniston
11 */
12
13#include <linux/notifier.h>
14
15typedef u8 uprobe_opcode_t;
16
17#define MAX_UINSN_BYTES			  16
18#define UPROBE_XOL_SLOT_BYTES		 128	/* to keep it cache aligned */
19
20#define UPROBE_SWBP_INSN		0xcc
21#define UPROBE_SWBP_INSN_SIZE		   1
22
23enum {
24	ARCH_UPROBE_FLAG_CAN_OPTIMIZE   = 0,
25	ARCH_UPROBE_FLAG_OPTIMIZE_FAIL  = 1,
26};
27
28struct uprobe_xol_ops;
29
30struct arch_uprobe {
31	union {
32		u8			insn[MAX_UINSN_BYTES];
33		u8			ixol[MAX_UINSN_BYTES];
34	};
35
36	const struct uprobe_xol_ops	*ops;
37
38	union {
39		struct {
40			s32	offs;
41			u8	ilen;
42			u8	opc1;
43		}			branch;
44		struct {
45			u8	fixups;
46			u8	ilen;
47		} 			defparam;
48		struct {
49			u8	reg_offset;	/* to the start of pt_regs */
50			u8	ilen;
51		}			push;
52	};
53
54	unsigned long flags;
55};
56
57struct arch_uprobe_task {
58#ifdef CONFIG_X86_64
59	unsigned long			saved_scratch_register;
60#endif
61	unsigned int			saved_trap_nr;
62	unsigned int			saved_tf;
63};
64
65#ifdef CONFIG_UPROBES
66extern bool is_uprobe_at_func_entry(struct pt_regs *regs);
67#else
68static bool is_uprobe_at_func_entry(struct pt_regs *regs)
69{
70	return false;
71}
72#endif /* CONFIG_UPROBES */
73
74#endif	/* _ASM_UPROBES_H */