1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 ARM Ltd.
4 */
5#ifndef __ASM_DEBUG_MONITORS_H
6#define __ASM_DEBUG_MONITORS_H
7
8#include <linux/errno.h>
9#include <linux/types.h>
10#include <asm/brk-imm.h>
11#include <asm/esr.h>
12#include <asm/insn.h>
13#include <asm/ptrace.h>
14
15/* Low-level stepping controls. */
16#define DBG_MDSCR_SS		(1 << 0)
17#define DBG_SPSR_SS		(1 << 21)
18
19/* MDSCR_EL1 enabling bits */
20#define DBG_MDSCR_KDE		(1 << 13)
21#define DBG_MDSCR_MDE		(1 << 15)
22#define DBG_MDSCR_MASK		~(DBG_MDSCR_KDE | DBG_MDSCR_MDE)
23
24#define	DBG_ESR_EVT(x)		(((x) >> 27) & 0x7)
25
26/* AArch64 */
27#define DBG_ESR_EVT_HWBP	0x0
28#define DBG_ESR_EVT_HWSS	0x1
29#define DBG_ESR_EVT_HWWP	0x2
30#define DBG_ESR_EVT_BRK		0x6
31
32/*
33 * Break point instruction encoding
34 */
35#define BREAK_INSTR_SIZE		AARCH64_INSN_SIZE
36
37#define AARCH64_BREAK_KGDB_DYN_DBG	\
38	(AARCH64_BREAK_MON | (KGDB_DYN_DBG_BRK_IMM << 5))
39
40#define CACHE_FLUSH_IS_SAFE		1
41
42/* kprobes BRK opcodes with ESR encoding  */
43#define BRK64_OPCODE_KPROBES	(AARCH64_BREAK_MON | (KPROBES_BRK_IMM << 5))
44#define BRK64_OPCODE_KPROBES_SS	(AARCH64_BREAK_MON | (KPROBES_BRK_SS_IMM << 5))
45/* uprobes BRK opcodes with ESR encoding  */
46#define BRK64_OPCODE_UPROBES	(AARCH64_BREAK_MON | (UPROBES_BRK_IMM << 5))
47
48/* AArch32 */
49#define DBG_ESR_EVT_BKPT	0x4
50#define DBG_ESR_EVT_VECC	0x5
51
52#define AARCH32_BREAK_ARM	0x07f001f0
53#define AARCH32_BREAK_THUMB	0xde01
54#define AARCH32_BREAK_THUMB2_LO	0xf7f0
55#define AARCH32_BREAK_THUMB2_HI	0xa000
56
57#ifndef __ASSEMBLY__
58struct task_struct;
59
60#define DBG_ARCH_ID_RESERVED	0	/* In case of ptrace ABI updates. */
61
62#define DBG_HOOK_HANDLED	0
63#define DBG_HOOK_ERROR		1
64
65struct step_hook {
66	struct list_head node;
67	int (*fn)(struct pt_regs *regs, unsigned long esr);
68};
69
70void register_user_step_hook(struct step_hook *hook);
71void unregister_user_step_hook(struct step_hook *hook);
72
73void register_kernel_step_hook(struct step_hook *hook);
74void unregister_kernel_step_hook(struct step_hook *hook);
75
76struct break_hook {
77	struct list_head node;
78	int (*fn)(struct pt_regs *regs, unsigned long esr);
79	u16 imm;
80	u16 mask; /* These bits are ignored when comparing with imm */
81};
82
83void register_user_break_hook(struct break_hook *hook);
84void unregister_user_break_hook(struct break_hook *hook);
85
86void register_kernel_break_hook(struct break_hook *hook);
87void unregister_kernel_break_hook(struct break_hook *hook);
88
89u8 debug_monitors_arch(void);
90
91enum dbg_active_el {
92	DBG_ACTIVE_EL0 = 0,
93	DBG_ACTIVE_EL1,
94};
95
96void enable_debug_monitors(enum dbg_active_el el);
97void disable_debug_monitors(enum dbg_active_el el);
98
99void user_rewind_single_step(struct task_struct *task);
100void user_fastforward_single_step(struct task_struct *task);
101void user_regs_reset_single_step(struct user_pt_regs *regs,
102				 struct task_struct *task);
103
104void kernel_enable_single_step(struct pt_regs *regs);
105void kernel_disable_single_step(void);
106int kernel_active_single_step(void);
107void kernel_rewind_single_step(struct pt_regs *regs);
108
109#ifdef CONFIG_HAVE_HW_BREAKPOINT
110int reinstall_suspended_bps(struct pt_regs *regs);
111#else
112static inline int reinstall_suspended_bps(struct pt_regs *regs)
113{
114	return -ENODEV;
115}
116#endif
117
118int aarch32_break_handler(struct pt_regs *regs);
119
120void debug_traps_init(void);
121
122#endif	/* __ASSEMBLY */
123#endif	/* __ASM_DEBUG_MONITORS_H */
124