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hw-breakpoints: reset bits in dr6 after the corresponding exception is handled

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This patch resets the bit in dr6 after the corresponding exception is
handled in code, so that we keep a clean track of the current virtual debug
status register.

[ Impact: keep track of breakpoints triggering completion ]

Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
K.Prasad
2009-06-01 23:47:06 +05:30
committed by Frederic Weisbecker
parent 0722db015c
commit 62edab9056
5 changed files with 34 additions and 6 deletions
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9
arch/x86/kernel/kprobes.c
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@@ -54,6 +54,7 @@
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/alternative.h>
#include <asm/debugreg.h>
void jprobe_return_end(void);
@@ -967,8 +968,14 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
ret = NOTIFY_STOP;
break;
case DIE_DEBUG:
if (post_kprobe_handler(args->regs))
if (post_kprobe_handler(args->regs)) {
/*
* Reset the BS bit in dr6 (pointed by args->err) to
* denote completion of processing
*/
(*(unsigned long *)ERR_PTR(args->err)) &= ~DR_STEP;
ret = NOTIFY_STOP;
}
break;
case DIE_GPF:
/*