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_HW_BREAKPOINT_H
17#define __ASM_HW_BREAKPOINT_H
18
19#ifdef __KERNEL__
20
21struct arch_hw_breakpoint_ctrl {
22 u32 __reserved : 19,
23 len : 8,
24 type : 2,
25 privilege : 2,
26 enabled : 1;
27};
28
29struct arch_hw_breakpoint {
30 u64 address;
31 u64 trigger;
32 struct arch_hw_breakpoint_ctrl ctrl;
33};
34
35static inline u32 encode_ctrl_reg(struct arch_hw_breakpoint_ctrl ctrl)
36{
37 return (ctrl.len << 5) | (ctrl.type << 3) | (ctrl.privilege << 1) |
38 ctrl.enabled;
39}
40
41static inline void decode_ctrl_reg(u32 reg,
42 struct arch_hw_breakpoint_ctrl *ctrl)
43{
44 ctrl->enabled = reg & 0x1;
45 reg >>= 1;
46 ctrl->privilege = reg & 0x3;
47 reg >>= 2;
48 ctrl->type = reg & 0x3;
49 reg >>= 2;
50 ctrl->len = reg & 0xff;
51}
52
53/* Breakpoint */
54#define ARM_BREAKPOINT_EXECUTE 0
55
56/* Watchpoints */
57#define ARM_BREAKPOINT_LOAD 1
58#define ARM_BREAKPOINT_STORE 2
59#define AARCH64_ESR_ACCESS_MASK (1 << 6)
60
61/* Privilege Levels */
62#define AARCH64_BREAKPOINT_EL1 1
63#define AARCH64_BREAKPOINT_EL0 2
64
65/* Lengths */
66#define ARM_BREAKPOINT_LEN_1 0x1
67#define ARM_BREAKPOINT_LEN_2 0x3
68#define ARM_BREAKPOINT_LEN_4 0xf
69#define ARM_BREAKPOINT_LEN_8 0xff
70
71/* Kernel stepping */
72#define ARM_KERNEL_STEP_NONE 0
73#define ARM_KERNEL_STEP_ACTIVE 1
74#define ARM_KERNEL_STEP_SUSPEND 2
75
76/*
77 * Limits.
78 * Changing these will require modifications to the register accessors.
79 */
80#define ARM_MAX_BRP 16
81#define ARM_MAX_WRP 16
82#define ARM_MAX_HBP_SLOTS (ARM_MAX_BRP + ARM_MAX_WRP)
83
84/* Virtual debug register bases. */
85#define AARCH64_DBG_REG_BVR 0
86#define AARCH64_DBG_REG_BCR (AARCH64_DBG_REG_BVR + ARM_MAX_BRP)
87#define AARCH64_DBG_REG_WVR (AARCH64_DBG_REG_BCR + ARM_MAX_BRP)
88#define AARCH64_DBG_REG_WCR (AARCH64_DBG_REG_WVR + ARM_MAX_WRP)
89
90/* Debug register names. */
91#define AARCH64_DBG_REG_NAME_BVR "bvr"
92#define AARCH64_DBG_REG_NAME_BCR "bcr"
93#define AARCH64_DBG_REG_NAME_WVR "wvr"
94#define AARCH64_DBG_REG_NAME_WCR "wcr"
95
96/* Accessor macros for the debug registers. */
97#define AARCH64_DBG_READ(N, REG, VAL) do {\
98 asm volatile("mrs %0, dbg" REG #N "_el1" : "=r" (VAL));\
99} while (0)
100
101#define AARCH64_DBG_WRITE(N, REG, VAL) do {\
102 asm volatile("msr dbg" REG #N "_el1, %0" :: "r" (VAL));\
103} while (0)
104
105struct task_struct;
106struct notifier_block;
107struct perf_event;
108struct pmu;
109
110extern int arch_bp_generic_fields(struct arch_hw_breakpoint_ctrl ctrl,
111 int *gen_len, int *gen_type);
112extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
113extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
114extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
115 unsigned long val, void *data);
116
117extern int arch_install_hw_breakpoint(struct perf_event *bp);
118extern void arch_uninstall_hw_breakpoint(struct perf_event *bp);
119extern void hw_breakpoint_pmu_read(struct perf_event *bp);
120extern int hw_breakpoint_slots(int type);
121
122#ifdef CONFIG_HAVE_HW_BREAKPOINT
123extern void hw_breakpoint_thread_switch(struct task_struct *next);
124extern void ptrace_hw_copy_thread(struct task_struct *task);
125#else
126static inline void hw_breakpoint_thread_switch(struct task_struct *next)
127{
128}
129static inline void ptrace_hw_copy_thread(struct task_struct *task)
130{
131}
132#endif
133
134extern struct pmu perf_ops_bp;
135
136#endif /* __KERNEL__ */
137#endif /* __ASM_BREAKPOINT_H */