diff options
| author | Will Deacon <will.deacon@arm.com> | 2010-09-03 10:39:59 +0100 |
|---|---|---|
| committer | Varun Colbert <vcolbert@nvidia.com> | 2011-05-17 11:52:24 -0700 |
| commit | 8f12346fe6c4fbfe3a883a22b62b12ad14ffc30d (patch) | |
| tree | 116bdd5dbb70d23e2fdd61bbe91d83957325cd42 /arch/arm | |
| parent | 4e53747f2a937963c3f54f0519451c91cc478d33 (diff) | |
ARM: 6355/1: hw-breakpoint: add mechanism for hooking into prefetch aborts
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.
This is picked from following git repository:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.38.y.git
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: S. Karthikeyan <informkarthik@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
(cherry picked from commit 3a4b5dca53aecb16db9e007d782b2d1e757e941a)
Change-Id: Ic278bad0e3bb95f504e46b216a8d14fd61fbc4a5
Reviewed-on: http://git-master/r/31574
Reviewed-by: Bo Yan <byan@nvidia.com>
Tested-by: Bo Yan <byan@nvidia.com>
Reviewed-by: Daniel Willemsen <dwillemsen@nvidia.com>
Reviewed-by: Scott Williams <scwilliams@nvidia.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/system.h | 4 | ||||
| -rw-r--r-- | arch/arm/mm/fault.c | 13 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 549c9786e0f9..bc2beafb41df 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -85,6 +85,10 @@ void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), int sig, int code, const char *name); +void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, + struct pt_regs *), + int sig, int code, 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 23b0b03af5ea..1e21e125fe3a 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -581,6 +581,19 @@ 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, int code, const char *name) +{ + if (nr < 0 || nr >= ARRAY_SIZE(ifsr_info)) + BUG(); + + ifsr_info[nr].fn = fn; + ifsr_info[nr].sig = sig; + ifsr_info[nr].code = code; + ifsr_info[nr].name = name; +} + asmlinkage void __exception do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs) { |