From: "K.Prasad" <prasad@linux.vnet.ibm.com>
To: David Gibson <dwg@au1.ibm.com>, linuxppc-dev@ozlabs.org
Cc: Michael Neuling <mikey@neuling.org>,
Benjamin Herrenschmidt <benh@au1.ibm.com>,
paulus@samba.org, Alan Stern <stern@rowland.harvard.edu>,
"K.Prasad" <prasad@linux.vnet.ibm.com>,
Roland McGrath <roland@redhat.com>
Subject: [Patch 5/6] PPC64-HWBKPT: Modify Data storage exception code to recognise DABR match first
Date: Fri, 4 Sep 2009 00:10:43 +0530 [thread overview]
Message-ID: <20090903184043.GF4590@in.ibm.com> (raw)
In-Reply-To: 20090903183306.875398457@xyz
Modify Data storage exception code to first lookout for a DABR match before
recognising a kprobe or xmon exception.
Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
---
arch/powerpc/mm/fault.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
Index: linux-2.6-tip.hbkpt/arch/powerpc/mm/fault.c
===================================================================
--- linux-2.6-tip.hbkpt.orig/arch/powerpc/mm/fault.c
+++ linux-2.6-tip.hbkpt/arch/powerpc/mm/fault.c
@@ -137,6 +137,12 @@ int __kprobes do_page_fault(struct pt_re
error_code &= 0x48200000;
else
is_write = error_code & DSISR_ISSTORE;
+
+ if (error_code & DSISR_DABRMATCH) {
+ /* DABR match */
+ do_dabr(regs, address, error_code);
+ return 0;
+ }
#else
is_write = error_code & ESR_DST;
#endif /* CONFIG_4xx || CONFIG_BOOKE */
@@ -151,14 +157,6 @@ int __kprobes do_page_fault(struct pt_re
if (!user_mode(regs) && (address >= TASK_SIZE))
return SIGSEGV;
-#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
- if (error_code & DSISR_DABRMATCH) {
- /* DABR match */
- do_dabr(regs, address, error_code);
- return 0;
- }
-#endif /* !(CONFIG_4xx || CONFIG_BOOKE)*/
-
if (in_atomic() || mm == NULL) {
if (!user_mode(regs))
return SIGSEGV;
next prev parent reply other threads:[~2009-09-03 18:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090903183306.875398457@xyz>
2009-09-03 18:40 ` [Patch 1/6] PPC64-HWBKPT: Prepare the PowerPC platform for HW Breakpoint infrastructure K.Prasad
2009-09-03 18:40 ` [Patch 2/6] PPC64-HWBKPT: Introduce PPC64 specific Hardware Breakpoint interfaces K.Prasad
2009-09-03 18:40 ` [Patch 3/6] PPC64-HWBKPT: Modify ptrace code to use " K.Prasad
2009-09-03 18:40 ` [Patch 4/6] PPC64-HWBKPT: Modify process/processor code to recognise hardware debug registers K.Prasad
2009-09-03 18:40 ` K.Prasad [this message]
2009-09-03 18:41 ` [Patch 6/6] PPC64-HWBKPT: Adapt kexec and samples code to recognise PPC64 hw-breakpoint K.Prasad
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