diff options
| author | Roland McGrath <roland@redhat.com> | 2008-01-30 13:30:54 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:54 +0100 |
| commit | 10faa81e102e2b7695f386812055cd2ef9e44b4c (patch) | |
| tree | bd21d2094eacca5b07d5ee5977cb0ad57ebc5c02 /arch/x86/kernel/traps_64.c | |
| parent | 7e9916040b3020d0f36d68bb7512e3b80b623097 (diff) | |
x86: debugctlmsr arch_has_block_step
This implements user-mode step-until-branch on x86 using the BTF bit
in MSR_IA32_DEBUGCTLMSR. It's just like single-step, only less so.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/traps_64.c')
| -rw-r--r-- | arch/x86/kernel/traps_64.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c index 874aca397b0..610a64d6bdf 100644 --- a/arch/x86/kernel/traps_64.c +++ b/arch/x86/kernel/traps_64.c @@ -850,6 +850,12 @@ asmlinkage void __kprobes do_debug(struct pt_regs * regs, get_debugreg(condition, 6); + /* + * The processor cleared BTF, so don't mark that we need it set. + */ + clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR); + tsk->thread.debugctlmsr = 0; + if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, SIGTRAP) == NOTIFY_STOP) return; |