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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>
This commit is contained in:
Oleg Nesterov 2013-11-19 17:20:21 +01:00
parent c912dae60a
commit ad439356ae
1 changed files with 15 additions and 0 deletions
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15
kernel/events/uprobes.c
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@ -73,6 +73,17 @@ struct uprobe {
struct inode *inode; /* Also hold a ref to inode */
loff_t offset;
unsigned long flags;
/*
* The generic code assumes that it has two members of unknown type
* owned by the arch-specific code:
*
* insn - copy_insn() saves the original instruction here for
* arch_uprobe_analyze_insn().
*
* ixol - potentially modified instruction to execute out of
* line, copied to xol_area by xol_get_insn_slot().
*/
struct arch_uprobe arch;
};
@ -86,6 +97,10 @@ struct return_instance {
};
/*
* Execute out of line area: anonymous executable mapping installed
* by the probed task to execute the copy of the original instruction
* mangled by set_swbp().
*
* On a breakpoint hit, thread contests for a slot. It frees the
* slot after singlestep. Currently a fixed number of slots are
* allocated.