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K.Prasad 5aae8a5370 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>

2010-06-22 19:40:50 +10:00

alloc.c

[POWERPC] Limit range of __init_ref_ok somewhat

2007-10-03 11:48:44 +10:00

checksum_32.S

powerpc: Rename files to have consistent _32/_64 suffixes

2005-10-10 21:52:43 +10:00

checksum_64.S

powerpc: Rename files to have consistent _32/_64 suffixes

2005-10-10 21:52:43 +10:00

code-patching.c

PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures