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| author | Will Deacon <will.deacon@arm.com> | 2010-09-03 10:39:59 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-09-08 10:04:59 +0100 |
| commit | 3a4b5dca53aecb16db9e007d782b2d1e757e941a (patch) | |
| tree | 2aae51c15a249882f656972929bf830b8e8a8b63 | |
| parent | d56557af19867edb8c0e96f8e26399698a08857f (diff) | |
| download | talos-op-linux-3a4b5dca53aecb16db9e007d782b2d1e757e941a.tar.gz talos-op-linux-3a4b5dca53aecb16db9e007d782b2d1e757e941a.zip | |
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.
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>
| -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 8ba1ccf82a02..b516cdea5ae2 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) { |
