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x86/hw-breakpoints: Don't lose GE flag while disabling a breakpoint

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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>
This commit is contained in:
Frederic Weisbecker 2009-11-26 06:04:38 +01:00 committed by Ingo Molnar
parent 605bfaee90
commit 2c31b7958f
1 changed files with 14 additions and 8 deletions
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22
arch/x86/kernel/hw_breakpoint.c
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@ -59,19 +59,25 @@ static DEFINE_PER_CPU(unsigned long, cpu_debugreg[HBP_NUM]);
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 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
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);
}