tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2012 ARM Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16#ifndef __ASM_DEBUG_MONITORS_H
17#define __ASM_DEBUG_MONITORS_H
18
19#ifdef __KERNEL__
20
21#define DBG_ESR_EVT(x) (((x) >> 27) & 0x7)
22
23/* AArch64 */
24#define DBG_ESR_EVT_HWBP 0x0
25#define DBG_ESR_EVT_HWSS 0x1
26#define DBG_ESR_EVT_HWWP 0x2
27#define DBG_ESR_EVT_BRK 0x6
28
29/*
30 * Break point instruction encoding
31 */
32#define BREAK_INSTR_SIZE 4
33
34/*
35 * ESR values expected for dynamic and compile time BRK instruction
36 */
37#define DBG_ESR_VAL_BRK(x) (0xf2000000 | ((x) & 0xfffff))
38
39/*
40 * #imm16 values used for BRK instruction generation
41 * Allowed values for kgbd are 0x400 - 0x7ff
42 * 0x400: for dynamic BRK instruction
43 * 0x401: for compile time BRK instruction
44 */
45#define KGDB_DYN_DGB_BRK_IMM 0x400
46#define KDBG_COMPILED_DBG_BRK_IMM 0x401
47
48/*
49 * BRK instruction encoding
50 * The #imm16 value should be placed at bits[20:5] within BRK ins
51 */
52#define AARCH64_BREAK_MON 0xd4200000
53
54/*
55 * Extract byte from BRK instruction
56 */
57#define KGDB_DYN_DGB_BRK_INS_BYTE(x) \
58 ((((AARCH64_BREAK_MON) & 0xffe0001f) >> (x * 8)) & 0xff)
59
60/*
61 * Extract byte from BRK #imm16
62 */
63#define KGBD_DYN_DGB_BRK_IMM_BYTE(x) \
64 (((((KGDB_DYN_DGB_BRK_IMM) & 0xffff) << 5) >> (x * 8)) & 0xff)
65
66#define KGDB_DYN_DGB_BRK_BYTE(x) \
67 (KGDB_DYN_DGB_BRK_INS_BYTE(x) | KGBD_DYN_DGB_BRK_IMM_BYTE(x))
68
69#define KGDB_DYN_BRK_INS_BYTE0 KGDB_DYN_DGB_BRK_BYTE(0)
70#define KGDB_DYN_BRK_INS_BYTE1 KGDB_DYN_DGB_BRK_BYTE(1)
71#define KGDB_DYN_BRK_INS_BYTE2 KGDB_DYN_DGB_BRK_BYTE(2)
72#define KGDB_DYN_BRK_INS_BYTE3 KGDB_DYN_DGB_BRK_BYTE(3)
73
74#define CACHE_FLUSH_IS_SAFE 1
75
76enum debug_el {
77 DBG_ACTIVE_EL0 = 0,
78 DBG_ACTIVE_EL1,
79};
80
81/* AArch32 */
82#define DBG_ESR_EVT_BKPT 0x4
83#define DBG_ESR_EVT_VECC 0x5
84
85#define AARCH32_BREAK_ARM 0x07f001f0
86#define AARCH32_BREAK_THUMB 0xde01
87#define AARCH32_BREAK_THUMB2_LO 0xf7f0
88#define AARCH32_BREAK_THUMB2_HI 0xa000
89
90#ifndef __ASSEMBLY__
91struct task_struct;
92
93#define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */
94
95#define DBG_HOOK_HANDLED 0
96#define DBG_HOOK_ERROR 1
97
98struct step_hook {
99 struct list_head node;
100 int (*fn)(struct pt_regs *regs, unsigned int esr);
101};
102
103void register_step_hook(struct step_hook *hook);
104void unregister_step_hook(struct step_hook *hook);
105
106struct break_hook {
107 struct list_head node;
108 u32 esr_val;
109 u32 esr_mask;
110 int (*fn)(struct pt_regs *regs, unsigned int esr);
111};
112
113void register_break_hook(struct break_hook *hook);
114void unregister_break_hook(struct break_hook *hook);
115
116u8 debug_monitors_arch(void);
117
118void enable_debug_monitors(enum debug_el el);
119void disable_debug_monitors(enum debug_el el);
120
121void user_rewind_single_step(struct task_struct *task);
122void user_fastforward_single_step(struct task_struct *task);
123
124void kernel_enable_single_step(struct pt_regs *regs);
125void kernel_disable_single_step(void);
126int kernel_active_single_step(void);
127
128#ifdef CONFIG_HAVE_HW_BREAKPOINT
129int reinstall_suspended_bps(struct pt_regs *regs);
130#else
131static inline int reinstall_suspended_bps(struct pt_regs *regs)
132{
133 return -ENODEV;
134}
135#endif
136
137int aarch32_break_handler(struct pt_regs *regs);
138
139#endif /* __ASSEMBLY */
140#endif /* __KERNEL__ */
141#endif /* __ASM_DEBUG_MONITORS_H */