X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=include%2Fasm-powerpc%2Fkprobes.h;h=3a5dd492588fed5560206c2e850825e79ce3ab64;hb=2b588224d1b2369dd6d9882a777380225b324006;hp=34e1f89a5fa02eda188e2654e47dda3555066686;hpb=a205729e2cd8e51257cd0ea738524c64da99b9e0;p=linux-2.6-omap-h63xx.git

diff --git a/include/asm-powerpc/kprobes.h b/include/asm-powerpc/kprobes.h
index 34e1f89a5fa..3a5dd492588 100644
--- a/include/asm-powerpc/kprobes.h
+++ b/include/asm-powerpc/kprobes.h
@@ -44,10 +44,37 @@ typedef unsigned int kprobe_opcode_t;
 #define IS_TDI(instr)		(((instr) & 0xfc000000) == 0x08000000)
 #define IS_TWI(instr)		(((instr) & 0xfc000000) == 0x0c000000)
 
-#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)((func_descr_t *)pentry)
+#ifdef CONFIG_PPC64
+/*
+ * 64bit powerpc uses function descriptors.
+ * Handle cases where:
+ * 		- User passes a <.symbol> or <module:.symbol>
+ * 		- User passes a <symbol> or <module: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 (addr) {							\
+		char *colon;						\
+		if ((colon = strchr(name, ':')) != NULL) {		\
+			colon++;					\
+			if (*colon != '\0' && *colon != '.')		\
+				addr = *(kprobe_opcode_t **)addr;	\
+		} else if (name[0] != '.')				\
+			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) || \
 			IS_TWI(instr) || IS_TDI(instr))
+#else
+/* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */
+#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)(pentry)
+#define is_trap(instr)	(IS_TW(instr) || IS_TWI(instr))
+#endif
 
 #define ARCH_SUPPORTS_KRETPROBES
 #define  ARCH_INACTIVE_KPROBE_COUNT 1