Loading...
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * PowerPC BookIII S hardware breakpoint definitions
4 *
5 * Copyright 2010, IBM Corporation.
6 * Author: K.Prasad <prasad@linux.vnet.ibm.com>
7 */
8
9#ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
10#define _PPC_BOOK3S_64_HW_BREAKPOINT_H
11
12#include <asm/cpu_has_feature.h>
13
14#ifdef __KERNEL__
15struct arch_hw_breakpoint {
16 unsigned long address;
17 u16 type;
18 u16 len; /* length of the target data symbol */
19 u16 hw_len; /* length programmed in hw */
20 u8 flags;
21 bool perf_single_step; /* temporarily uninstalled for a perf single step */
22};
23
24/* Note: Don't change the first 6 bits below as they are in the same order
25 * as the dabr and dabrx.
26 */
27#define HW_BRK_TYPE_READ 0x01
28#define HW_BRK_TYPE_WRITE 0x02
29#define HW_BRK_TYPE_TRANSLATE 0x04
30#define HW_BRK_TYPE_USER 0x08
31#define HW_BRK_TYPE_KERNEL 0x10
32#define HW_BRK_TYPE_HYP 0x20
33#define HW_BRK_TYPE_EXTRANEOUS_IRQ 0x80
34
35/* bits that overlap with the bottom 3 bits of the dabr */
36#define HW_BRK_TYPE_RDWR (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
37#define HW_BRK_TYPE_DABR (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
38#define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
39 HW_BRK_TYPE_HYP)
40
41#define HW_BRK_FLAG_DISABLED 0x1
42
43/* Minimum granularity */
44#ifdef CONFIG_PPC_8xx
45#define HW_BREAKPOINT_SIZE 0x4
46#else
47#define HW_BREAKPOINT_SIZE 0x8
48#endif
49#define HW_BREAKPOINT_SIZE_QUADWORD 0x10
50
51#define DABR_MAX_LEN 8
52#define DAWR_MAX_LEN 512
53
54static inline int nr_wp_slots(void)
55{
56 return cpu_has_feature(CPU_FTR_DAWR1) ? 2 : 1;
57}
58
59bool wp_check_constraints(struct pt_regs *regs, ppc_inst_t instr,
60 unsigned long ea, int type, int size,
61 struct arch_hw_breakpoint *info);
62
63void wp_get_instr_detail(struct pt_regs *regs, ppc_inst_t *instr,
64 int *type, int *size, unsigned long *ea);
65
66#ifdef CONFIG_HAVE_HW_BREAKPOINT
67#include <linux/kdebug.h>
68#include <asm/reg.h>
69#include <asm/debug.h>
70
71struct perf_event_attr;
72struct perf_event;
73struct pmu;
74struct perf_sample_data;
75struct task_struct;
76
77extern int hw_breakpoint_slots(int type);
78extern int arch_bp_generic_fields(int type, int *gen_bp_type);
79extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
80extern int hw_breakpoint_arch_parse(struct perf_event *bp,
81 const struct perf_event_attr *attr,
82 struct arch_hw_breakpoint *hw);
83extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
84 unsigned long val, void *data);
85int arch_install_hw_breakpoint(struct perf_event *bp);
86void arch_uninstall_hw_breakpoint(struct perf_event *bp);
87void hw_breakpoint_pmu_read(struct perf_event *bp);
88extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
89
90extern struct pmu perf_ops_bp;
91extern void ptrace_triggered(struct perf_event *bp,
92 struct perf_sample_data *data, struct pt_regs *regs);
93static inline void hw_breakpoint_disable(void)
94{
95 int i;
96 struct arch_hw_breakpoint null_brk = {0};
97
98 if (!ppc_breakpoint_available())
99 return;
100
101 for (i = 0; i < nr_wp_slots(); i++)
102 __set_breakpoint(i, &null_brk);
103}
104extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
105int hw_breakpoint_handler(struct die_args *args);
106
107#else /* CONFIG_HAVE_HW_BREAKPOINT */
108static inline void hw_breakpoint_disable(void) { }
109static inline void thread_change_pc(struct task_struct *tsk,
110 struct pt_regs *regs) { }
111
112#endif /* CONFIG_HAVE_HW_BREAKPOINT */
113
114
115#ifdef CONFIG_PPC_DAWR
116extern bool dawr_force_enable;
117static inline bool dawr_enabled(void)
118{
119 return dawr_force_enable;
120}
121int set_dawr(int nr, struct arch_hw_breakpoint *brk);
122#else
123static inline bool dawr_enabled(void) { return false; }
124static inline int set_dawr(int nr, struct arch_hw_breakpoint *brk) { return -1; }
125#endif
126
127#endif /* __KERNEL__ */
128#endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */
1/*
2 * PowerPC BookIII S hardware breakpoint definitions
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 as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * Copyright 2010, IBM Corporation.
19 * Author: K.Prasad <prasad@linux.vnet.ibm.com>
20 *
21 */
22
23#ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
24#define _PPC_BOOK3S_64_HW_BREAKPOINT_H
25
26#ifdef __KERNEL__
27struct arch_hw_breakpoint {
28 unsigned long address;
29 u16 type;
30 u16 len; /* length of the target data symbol */
31};
32
33/* Note: Don't change the the first 6 bits below as they are in the same order
34 * as the dabr and dabrx.
35 */
36#define HW_BRK_TYPE_READ 0x01
37#define HW_BRK_TYPE_WRITE 0x02
38#define HW_BRK_TYPE_TRANSLATE 0x04
39#define HW_BRK_TYPE_USER 0x08
40#define HW_BRK_TYPE_KERNEL 0x10
41#define HW_BRK_TYPE_HYP 0x20
42#define HW_BRK_TYPE_EXTRANEOUS_IRQ 0x80
43
44/* bits that overlap with the bottom 3 bits of the dabr */
45#define HW_BRK_TYPE_RDWR (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
46#define HW_BRK_TYPE_DABR (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
47#define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
48 HW_BRK_TYPE_HYP)
49
50#ifdef CONFIG_HAVE_HW_BREAKPOINT
51#include <linux/kdebug.h>
52#include <asm/reg.h>
53#include <asm/debug.h>
54
55struct perf_event;
56struct pmu;
57struct perf_sample_data;
58
59#define HW_BREAKPOINT_ALIGN 0x7
60
61extern int hw_breakpoint_slots(int type);
62extern int arch_bp_generic_fields(int type, int *gen_bp_type);
63extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
64extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
65extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
66 unsigned long val, void *data);
67int arch_install_hw_breakpoint(struct perf_event *bp);
68void arch_uninstall_hw_breakpoint(struct perf_event *bp);
69void hw_breakpoint_pmu_read(struct perf_event *bp);
70extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
71
72extern struct pmu perf_ops_bp;
73extern void ptrace_triggered(struct perf_event *bp,
74 struct perf_sample_data *data, struct pt_regs *regs);
75static inline void hw_breakpoint_disable(void)
76{
77 struct arch_hw_breakpoint brk;
78
79 brk.address = 0;
80 brk.type = 0;
81 brk.len = 0;
82 __set_breakpoint(&brk);
83}
84extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
85
86#else /* CONFIG_HAVE_HW_BREAKPOINT */
87static inline void hw_breakpoint_disable(void) { }
88static inline void thread_change_pc(struct task_struct *tsk,
89 struct pt_regs *regs) { }
90#endif /* CONFIG_HAVE_HW_BREAKPOINT */
91#endif /* __KERNEL__ */
92#endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */