From: will.deacon@arm•com (Will Deacon)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 1/4] ARM: hw-breakpoint: add mechanism for hooking into prefetch aborts
Date: Thu, 10 Jun 2010 15:59:54 +0100 [thread overview]
Message-ID: <1276181997-20677-2-git-send-email-will.deacon@arm.com> (raw)
In-Reply-To: <1276181997-20677-1-git-send-email-will.deacon@arm.com>
On ARM processors with hardware breakpoint and watchpoint support,
triggering these events results in a debug exception. These manifest
as prefetch and data aborts respectively.
arch/arm/mm/fault.c already provides hook_fault_code for hooking
into data aborts dependent on the DFSR. This patch adds a new function,
hook_ifault_code for hooking into prefetch aborts in the same manner.
Cc: Frederic Weisbecker <fweisbec@gmail•com>
Cc: S. Karthikeyan <informkarthik@gmail•com>
Signed-off-by: Will Deacon <will.deacon@arm•com>
---
arch/arm/include/asm/system.h | 3 +++
arch/arm/mm/fault.c | 11 +++++++++++
2 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 5f4f480..42da2f8 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -84,6 +84,9 @@ void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
struct pt_regs *),
int sig, const char *name);
+void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
+ struct pt_regs *),
+ int sig, const char *name);
#define xchg(ptr,x) \
((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 92f5801..a71b410 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -572,6 +572,17 @@ static struct fsr_info ifsr_info[] = {
{ do_bad, SIGBUS, 0, "unknown 31" },
};
+void __init
+hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *),
+ int sig, const char *name)
+{
+ if (nr >= 0 && nr < ARRAY_SIZE(ifsr_info)) {
+ ifsr_info[nr].fn = fn;
+ ifsr_info[nr].sig = sig;
+ ifsr_info[nr].name = name;
+ }
+}
+
asmlinkage void __exception
do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
{
--
1.6.3.3
next prev parent reply other threads:[~2010-06-10 14:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-10 14:59 [RFC PATCH 0/4] ARM: add support for hw-breakpoints [v3] Will Deacon
2010-06-10 14:59 ` Will Deacon [this message]
2010-06-10 14:59 ` [PATCH 2/4] ARM: hw-breakpoint: add ARM backend for the hw-breakpoint framework Will Deacon
2010-06-10 14:59 ` [PATCH 3/4] ARM: hw-breakpoint: add new ptrace requests for hw-breakpoint interaction Will Deacon
2010-06-10 14:59 ` [PATCH 4/4] ARM: hw-breakpoint: add HAVE_HW_BREAKPOINT to Kconfig Will Deacon
2010-06-16 9:12 ` [RFC PATCH 0/4] ARM: add support for hw-breakpoints [v3] Will Deacon
-- strict thread matches above, loose matches on Subject: below --
2010-07-07 16:22 [PATCH 0/4] ARM: add support for hw-breakpoints [v4] Will Deacon
2010-07-07 16:22 ` [PATCH 1/4] ARM: hw-breakpoint: add mechanism for hooking into prefetch aborts Will Deacon
2010-08-10 13:10 [PATCH 0/4] ARM: add support for hw-breakpoints [v5] Will Deacon
2010-08-10 13:10 ` [PATCH 1/4] ARM: hw-breakpoint: add mechanism for hooking into prefetch aborts Will Deacon
2010-08-23 15:54 [PATCH 0/4] ARM: add support for hw-breakpoints [v6] Will Deacon
2010-08-23 15:54 ` [PATCH 1/4] ARM: hw-breakpoint: add mechanism for hooking into prefetch aborts Will Deacon
2010-09-02 10:55 ` Russell King - ARM Linux
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