x86/hw-breakpoints: Don't lose GE flag while disabling a breakpoint
When we schedule out a breakpoint from the cpu, we also
incidentally remove the "Global exact breakpoint" flag from the
breakpoint control register. It makes us losing the fine grained
precision about the origin of the instructions that may trigger
breakpoint exceptions for the other breakpoints running in this
cpu.
Reported-by: Prasad <prasad@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1259211878-6013-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index 92ea5aa..d42f65a 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -59,19 +59,25 @@
static DEFINE_PER_CPU(struct perf_event *, bp_per_reg[HBP_NUM]);
+static inline unsigned long
+__encode_dr7(int drnum, unsigned int len, unsigned int type)
+{
+ unsigned long bp_info;
+
+ bp_info = (len | type) & 0xf;
+ bp_info <<= (DR_CONTROL_SHIFT + drnum * DR_CONTROL_SIZE);
+ bp_info |= (DR_GLOBAL_ENABLE << (drnum * DR_ENABLE_SIZE));
+
+ return bp_info;
+}
+
/*
* Encode the length, type, Exact, and Enable bits for a particular breakpoint
* as stored in debug register 7.
*/
unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type)
{
- unsigned long bp_info;
-
- bp_info = (len | type) & 0xf;
- bp_info <<= (DR_CONTROL_SHIFT + drnum * DR_CONTROL_SIZE);
- bp_info |= (DR_GLOBAL_ENABLE << (drnum * DR_ENABLE_SIZE)) |
- DR_GLOBAL_SLOWDOWN;
- return bp_info;
+ return __encode_dr7(drnum, len, type) | DR_GLOBAL_SLOWDOWN;
}
/*
@@ -154,7 +160,7 @@
return;
dr7 = &__get_cpu_var(cpu_dr7);
- *dr7 &= ~encode_dr7(i, info->len, info->type);
+ *dr7 &= ~__encode_dr7(i, info->len, info->type);
set_debugreg(*dr7, 7);
}