uprobes: allow ignoring of probe hits
Allow arches to decided to ignore a probe hit. ARM will use this to only call handlers if the conditions to execute a conditionally executed instruction are satisfied. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Oleg Nesterov <oleg@redhat.com>
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@ -126,6 +126,7 @@ extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
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extern int arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
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extern int arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
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extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
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extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
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extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs);
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extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs);
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extern bool __weak arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs);
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#else /* !CONFIG_UPROBES */
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#else /* !CONFIG_UPROBES */
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struct uprobes_state {
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struct uprobes_state {
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};
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};
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@ -1804,6 +1804,11 @@ static bool handle_trampoline(struct pt_regs *regs)
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return true;
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return true;
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}
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}
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bool __weak arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs)
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{
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return false;
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}
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/*
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/*
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* Run handler and ask thread to singlestep.
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* Run handler and ask thread to singlestep.
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* Ensure all non-fatal signals cannot interrupt thread while it singlesteps.
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* Ensure all non-fatal signals cannot interrupt thread while it singlesteps.
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@ -1858,7 +1863,11 @@ static void handle_swbp(struct pt_regs *regs)
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if (!get_utask())
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if (!get_utask())
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goto out;
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goto out;
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if (arch_uprobe_ignore(&uprobe->arch, regs))
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goto out;
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handler_chain(uprobe, regs);
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handler_chain(uprobe, regs);
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if (can_skip_sstep(uprobe, regs))
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if (can_skip_sstep(uprobe, regs))
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goto out;
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goto out;
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