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x86, ptrace: Fix block-step

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Implement ptrace-block-step using TIF_BLOCKSTEP which will set
DEBUGCTLMSR_BTF when set for a task while preserving any other
DEBUGCTLMSR bits.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100325135414.017536066@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-03-25 14:51:51 +01:00 • committed by Ingo Molnar
commit ea8e61b7bb
6 changed files with 53 additions and 9 deletions
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4
arch/x86/include/asm/processor.h
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@ -799,7 +799,7 @@ extern void cpu_init(void);
static inline unsigned long get_debugctlmsr(void)
{
unsigned long debugctlmsr = 0;
unsigned long debugctlmsr = 0;
#ifndef CONFIG_X86_DEBUGCTLMSR
if (boot_cpu_data.x86 < 6)
@ -807,7 +807,7 @@ static inline unsigned long get_debugctlmsr(void)
#endif
rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
return debugctlmsr;
return debugctlmsr;
}
static inline void update_debugctlmsr(unsigned long debugctlmsr)