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-rw-r--r--include/asm-powerpc/kprobes.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-powerpc/kprobes.h b/include/asm-powerpc/kprobes.h
index 34e1f89..1ef54be 100644
--- a/include/asm-powerpc/kprobes.h
+++ b/include/asm-powerpc/kprobes.h
@@ -44,6 +44,21 @@ typedef unsigned int kprobe_opcode_t;
#define IS_TDI(instr) (((instr) & 0xfc000000) == 0x08000000)
#define IS_TWI(instr) (((instr) & 0xfc000000) == 0x0c000000)
+/*
+ * 64bit powerpc uses function descriptors.
+ * Handle cases where:
+ * - User passes a <.symbol>
+ * - User passes a <symbol>
+ * - User passes a non-existant symbol, kallsyms_lookup_name
+ * returns 0. Don't deref the NULL pointer in that case
+ */
+#define kprobe_lookup_name(name, addr) \
+{ \
+ addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
+ if (!(name[0] == '.') && addr) \
+ addr = *(kprobe_opcode_t **)addr; \
+}
+
#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)((func_descr_t *)pentry)
#define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \
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