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authorRoland McGrath <roland@redhat.com>2008-01-30 07:30:54 -0500
committerIngo Molnar <mingo@elte.hu>2008-01-30 07:30:54 -0500
commit10faa81e102e2b7695f386812055cd2ef9e44b4c (patch)
treebd21d2094eacca5b07d5ee5977cb0ad57ebc5c02 /arch/x86/kernel/traps_32.c
parent7e9916040b3020d0f36d68bb7512e3b80b623097 (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_32.c')
-rw-r--r--arch/x86/kernel/traps_32.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
index 02d1e1e58e81..9b0bbd508cd5 100644
--- a/arch/x86/kernel/traps_32.c
+++ b/arch/x86/kernel/traps_32.c
@@ -837,6 +837,12 @@ fastcall void __kprobes do_debug(struct pt_regs * regs, long error_code)
837 837
838 get_debugreg(condition, 6); 838 get_debugreg(condition, 6);
839 839
840 /*
841 * The processor cleared BTF, so don't mark that we need it set.
842 */
843 clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR);
844 tsk->thread.debugctlmsr = 0;
845
840 if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, 846 if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
841 SIGTRAP) == NOTIFY_STOP) 847 SIGTRAP) == NOTIFY_STOP)
842 return; 848 return;