diff options
| author | K.Prasad <prasad@linux.vnet.ibm.com> | 2010-06-15 10:05:19 +0400 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2010-06-22 13:40:50 +0400 |
| commit | 5aae8a53708025d4e718f0d2e7c2f766779ddc71 (patch) | |
| tree | d151e2c29e78248cee620cf5094a15316abd17d2 /arch/powerpc/include/asm/processor.h | |
| parent | f7136c5150c29846d7a1d09109449d96b2f63445 (diff) | |
| download | linux-5aae8a53708025d4e718f0d2e7c2f766779ddc71.tar.xz | |
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/processor.h')
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index 7492fe8ad6e4..19c05b0f74be 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -209,6 +209,14 @@ struct thread_struct { #ifdef CONFIG_PPC64 unsigned long start_tb; /* Start purr when proc switched in */ unsigned long accum_tb; /* Total accumilated purr for process */ +#ifdef CONFIG_HAVE_HW_BREAKPOINT + struct perf_event *ptrace_bps[HBP_NUM]; + /* + * Helps identify source of single-step exception and subsequent + * hw-breakpoint enablement + */ + struct perf_event *last_hit_ubp; +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ #endif unsigned long dabr; /* Data address breakpoint register */ #ifdef CONFIG_ALTIVEC |