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authorK.Prasad <prasad@linux.vnet.ibm.com>2010-06-15 02:05:19 -0400
committerPaul Mackerras <paulus@samba.org>2010-06-22 05:40:50 -0400
commit5aae8a53708025d4e718f0d2e7c2f766779ddc71 (patch)
treed151e2c29e78248cee620cf5094a15316abd17d2 /arch/powerpc/include/asm/hw_breakpoint.h
parentf7136c5150c29846d7a1d09109449d96b2f63445 (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.h73
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
29struct 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
39static inline int hw_breakpoint_slots(int type)
40{
41 return HBP_NUM;
42}
43struct perf_event;
44struct pmu;
45struct 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
51extern int arch_bp_generic_fields(int type, int *gen_bp_type);
52extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
53extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
54extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
55 unsigned long val, void *data);
56int arch_install_hw_breakpoint(struct perf_event *bp);
57void arch_uninstall_hw_breakpoint(struct perf_event *bp);
58void hw_breakpoint_pmu_read(struct perf_event *bp);
59extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
60
61extern struct pmu perf_ops_bp;
62extern void ptrace_triggered(struct perf_event *bp, int nmi,
63 struct perf_sample_data *data, struct pt_regs *regs);
64static inline void hw_breakpoint_disable(void)
65{
66 set_dabr(0);
67}
68
69#else /* CONFIG_HAVE_HW_BREAKPOINT */
70static inline void hw_breakpoint_disable(void) { }
71#endif /* CONFIG_HAVE_HW_BREAKPOINT */
72#endif /* __KERNEL__ */
73#endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */