forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

powerpc: Hardware breakpoints rewrite to handle non DABR breakpoint registers

Browse source 
This is a rewrite so that we don't assume we are using the DABR throughout the
code.  We now use the arch_hw_breakpoint to store the breakpoint in a generic
manner in the thread_struct, rather than storing the raw DABR value.

The ptrace GET/SET_DEBUGREG interface currently passes the raw DABR in from
userspace.  We keep this functionality, so that future changes (like the POWER8
DAWR), will still fake the DABR to userspace.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2012-12-20 14:06:44 +00:00 • committed by Benjamin Herrenschmidt
parent a8190a59e7
commit 9422de3e95
14 changed files with 187 additions and 129 deletions
Download patch file Download diff file Expand all files Collapse all files

4
arch/powerpc/include/asm/processor.h
View file

@ -33,6 +33,7 @@
#include <linux/cache.h>
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/hw_breakpoint.h>
/* We do _not_ want to define new machine types at all, those must die
* in favor of using the device-tree
@ -225,8 +226,7 @@ struct thread_struct {
struct perf_event *last_hit_ubp;
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
#endif
unsigned long dabr; /* Data address breakpoint register */
unsigned long dabrx; /* ... extension */
struct arch_hw_breakpoint hw_brk; /* info on the hardware breakpoint */
unsigned long trap_nr; /* last trap # on this thread */
#ifdef CONFIG_ALTIVEC
/* Complete AltiVec register set */