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Subject[PATCH v7 3.2-rc2 6/30] uprobes: define fixups.

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@us.ibm.com>
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---
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 fa2b663..dd308fa 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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