uprobes: Document xol_area and arch_uprobe->insn/ixol
Document xol_area and arch_uprobe. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
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@ -73,6 +73,17 @@ struct uprobe {
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struct inode *inode; /* Also hold a ref to inode */
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loff_t offset;
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unsigned long flags;
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/*
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* The generic code assumes that it has two members of unknown type
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* owned by the arch-specific code:
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*
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* insn - copy_insn() saves the original instruction here for
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* arch_uprobe_analyze_insn().
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*
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* ixol - potentially modified instruction to execute out of
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* line, copied to xol_area by xol_get_insn_slot().
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*/
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struct arch_uprobe arch;
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};
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@ -86,6 +97,10 @@ struct return_instance {
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};
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/*
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* Execute out of line area: anonymous executable mapping installed
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* by the probed task to execute the copy of the original instruction
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* mangled by set_swbp().
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*
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* On a breakpoint hit, thread contests for a slot. It frees the
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* slot after singlestep. Currently a fixed number of slots are
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* allocated.
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