From bdc1e47217315be14ba04881b0a4c8ecb3ff320c Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Mon, 20 Aug 2012 12:47:34 +0200 Subject: uprobes/x86: Implement x86 specific arch_uprobe_*_step The arch specific implementation behaves like user_enable_single_step() except that it does not disable single stepping if it was already enabled by ptrace. This allows the debugger to single step over an uprobe. The state of block stepping is not restored. It makes only sense together with TF and if that was enabled then the debugger is notified. Note: this is still not correct. For example, TIF_SINGLESTEP check is not right, the application itself can set X86_EFLAGS_TF. And otoh we leak TIF_SINGLESTEP (set by enable) if the probed insn is "popf". See the next patches, we need the changes in arch/x86/kernel/step.c first. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Oleg Nesterov Acked-by: Srikar Dronamraju --- arch/x86/include/asm/uprobes.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/x86/include/asm/uprobes.h') diff --git a/arch/x86/include/asm/uprobes.h b/arch/x86/include/asm/uprobes.h index f3971bbcd1de..cee58624cb30 100644 --- a/arch/x86/include/asm/uprobes.h +++ b/arch/x86/include/asm/uprobes.h @@ -46,6 +46,8 @@ struct arch_uprobe_task { #ifdef CONFIG_X86_64 unsigned long saved_scratch_register; #endif +#define UPROBE_CLEAR_TF (1 << 0) + unsigned int restore_flags; }; extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long addr); -- cgit v1.2.3