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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 enum debug_el {
30         DBG_ACTIVE_EL0 = 0,
31         DBG_ACTIVE_EL1,
32 };
33
34 /* AArch32 */
35 #define DBG_ESR_EVT_BKPT        0x4
36 #define DBG_ESR_EVT_VECC        0x5
37
38 #define AARCH32_BREAK_ARM       0x07f001f0
39 #define AARCH32_BREAK_THUMB     0xde01
40 #define AARCH32_BREAK_THUMB2_LO 0xf7f0
41 #define AARCH32_BREAK_THUMB2_HI 0xa000
42
43 #ifndef __ASSEMBLY__
44 struct task_struct;
45
46 #define local_dbg_save(flags)                                                   \
47         do {                                                                    \
48                 typecheck(unsigned long, flags);                                \
49                 asm volatile(                                                   \
50                 "mrs    %0, daif                        // local_dbg_save\n"    \
51                 "msr    daifset, #8"                                            \
52                 : "=r" (flags) : : "memory");                                   \
53         } while (0)
54
55 #define local_dbg_restore(flags)                                                \
56         do {                                                                    \
57                 typecheck(unsigned long, flags);                                \
58                 asm volatile(                                                   \
59                 "msr    daif, %0                        // local_dbg_restore\n" \
60                 : : "r" (flags) : "memory");                                    \
61         } while (0)
62
63 #define DBG_ARCH_ID_RESERVED    0       /* In case of ptrace ABI updates. */
64
65 u8 debug_monitors_arch(void);
66
67 void enable_debug_monitors(enum debug_el el);
68 void disable_debug_monitors(enum debug_el el);
69
70 void user_rewind_single_step(struct task_struct *task);
71 void user_fastforward_single_step(struct task_struct *task);
72
73 void kernel_enable_single_step(struct pt_regs *regs);
74 void kernel_disable_single_step(void);
75 int kernel_active_single_step(void);
76
77 #ifdef CONFIG_HAVE_HW_BREAKPOINT
78 int reinstall_suspended_bps(struct pt_regs *regs);
79 #else
80 static inline int reinstall_suspended_bps(struct pt_regs *regs)
81 {
82         return -ENODEV;
83 }
84 #endif
85
86 #endif  /* __ASSEMBLY */
87 #endif  /* __KERNEL__ */
88 #endif  /* __ASM_DEBUG_MONITORS_H */