diff options
author | K.Prasad <prasad@linux.vnet.ibm.com> | 2010-06-15 02:05:19 -0400 |
---|---|---|
committer | Paul Mackerras <paulus@samba.org> | 2010-06-22 05:40:50 -0400 |
commit | 5aae8a53708025d4e718f0d2e7c2f766779ddc71 (patch) | |
tree | d151e2c29e78248cee620cf5094a15316abd17d2 /arch/powerpc/include/asm/hw_breakpoint.h | |
parent | f7136c5150c29846d7a1d09109449d96b2f63445 (diff) |
powerpc, hw_breakpoints: Implement hw_breakpoints for 64-bit server processors
Implement perf-events based hw-breakpoint interfaces for PowerPC
64-bit server (Book III S) processors. This allows access to a
given location to be used as an event that can be counted or
profiled by the perf_events subsystem.
This is done using the DABR (data breakpoint register), which can
also be used for process debugging via ptrace. When perf_event
hw_breakpoint support is configured in, the perf_event subsystem
manages the DABR and arbitrates access to it, and ptrace then
creates a perf_event when it is requested to set a data breakpoint.
[Adopted suggestions from Paul Mackerras <paulus@samba.org> to
- emulate_step() all system-wide breakpoints and single-step only the
per-task breakpoints
- perform arch-specific cleanup before unregistration through
arch_unregister_hw_breakpoint()
]
Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/include/asm/hw_breakpoint.h')
-rw-r--r-- | arch/powerpc/include/asm/hw_breakpoint.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/hw_breakpoint.h b/arch/powerpc/include/asm/hw_breakpoint.h new file mode 100644 index 000000000000..b111713b593e --- /dev/null +++ b/arch/powerpc/include/asm/hw_breakpoint.h | |||
@@ -0,0 +1,73 @@ | |||
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__ | ||
27 | #ifdef CONFIG_HAVE_HW_BREAKPOINT | ||
28 | |||
29 | struct arch_hw_breakpoint { | ||
30 | u8 len; /* length of the target data symbol */ | ||
31 | int type; | ||
32 | unsigned long address; | ||
33 | }; | ||
34 | |||
35 | #include <linux/kdebug.h> | ||
36 | #include <asm/reg.h> | ||
37 | #include <asm/system.h> | ||
38 | |||
39 | static inline int hw_breakpoint_slots(int type) | ||
40 | { | ||
41 | return HBP_NUM; | ||
42 | } | ||
43 | struct perf_event; | ||
44 | struct pmu; | ||
45 | struct perf_sample_data; | ||
46 | |||
47 | #define HW_BREAKPOINT_ALIGN 0x7 | ||
48 | /* Maximum permissible length of any HW Breakpoint */ | ||
49 | #define HW_BREAKPOINT_LEN 0x8 | ||
50 | |||
51 | extern int arch_bp_generic_fields(int type, int *gen_bp_type); | ||
52 | extern int arch_check_bp_in_kernelspace(struct perf_event *bp); | ||
53 | extern int arch_validate_hwbkpt_settings(struct perf_event *bp); | ||
54 | extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, | ||
55 | unsigned long val, void *data); | ||
56 | int arch_install_hw_breakpoint(struct perf_event *bp); | ||
57 | void arch_uninstall_hw_breakpoint(struct perf_event *bp); | ||
58 | void hw_breakpoint_pmu_read(struct perf_event *bp); | ||
59 | extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); | ||
60 | |||
61 | extern struct pmu perf_ops_bp; | ||
62 | extern void ptrace_triggered(struct perf_event *bp, int nmi, | ||
63 | struct perf_sample_data *data, struct pt_regs *regs); | ||
64 | static inline void hw_breakpoint_disable(void) | ||
65 | { | ||
66 | set_dabr(0); | ||
67 | } | ||
68 | |||
69 | #else /* CONFIG_HAVE_HW_BREAKPOINT */ | ||
70 | static inline void hw_breakpoint_disable(void) { } | ||
71 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ | ||
72 | #endif /* __KERNEL__ */ | ||
73 | #endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */ | ||