Commit-ID: ad439356ae5ae7688b39f1107fd5b874850fec18
Gitweb: http://git.kernel.org/tip/ad439356ae5ae7688b39f1107fd5b874850fec18
Author: Oleg Nesterov <oleg@xxxxxxxxxx>
AuthorDate: Tue, 19 Nov 2013 17:20:21 +0100
Committer: Oleg Nesterov <oleg@xxxxxxxxxx>
CommitDate: Wed, 20 Nov 2013 16:31:07 +0100
uprobes: Document xol_area and arch_uprobe->insn/ixol
Document xol_area and arch_uprobe.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Acked-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
---
kernel/events/uprobes.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 51a7f53..b886a5e 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -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.
--
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