[PATCH v5 3.1.0-rc4-tip 6/26] Uprobes: define fixups.

[Srikar Dronamraju]

During the first insertion of a probepoint, instruction is analyzed for
fixups and cached in the per-uprobe struct. On a probehit, the cached
fixup is used. Fixup analysis and caching is done in arch-specific
code.

Signed-off-by: Jim Keniston <jkenisto@xxxxxxxxxx>
Signed-off-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
---
 include/linux/uprobes.h |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 50a8c67..074c4e9 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -33,6 +33,17 @@ struct vm_area_struct;
 #define MAX_UINSN_BYTES 4
 #endif
 
+#define uprobe_opcode_sz sizeof(uprobe_opcode_t)
+
+/* Post-execution fixups.  Some architectures may define others. */
+
+/* No fixup needed */
+#define UPROBES_FIX_NONE	0x0
+/* Adjust IP back to vicinity of actual insn */
+#define UPROBES_FIX_IP	0x1
+/* Adjust the return address of a call insn */
+#define UPROBES_FIX_CALL	0x2
+
 struct uprobe_consumer {
 	int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
 	/*
@@ -53,6 +64,7 @@ struct uprobe {
 	struct inode		*inode;		/* Also hold a ref to inode */
 	loff_t			offset;
 	int			copy;
+	u16			fixups;
 	u8			insn[MAX_UINSN_BYTES];
 };
 
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