Added ppc64 _stp_stack_print

1 files changed, 17 insertions, 0 deletions

diff --git a/runtime/runtime.h b/runtime/runtime.h
index fba6f153..f226358f 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -71,6 +71,10 @@ static const char * (*_stp_kallsyms_lookup)(unsigned long addr,
 					    unsigned long *symbolsize,
 					    unsigned long *offset,
 					    char **modname, char *namebuf);
+#if defined (__powerpc64__)
+static int (*_stp_validate_sp)(unsigned long sp, struct task_struct *p,
+				unsigned long nbytes);
+#endif
 
 /* TEST_MODE is always defined by systemtap */
 #ifdef TEST_MODE
@@ -132,8 +136,21 @@ static const char * _stp_kallsyms_lookup_tabled (unsigned long addr,
 #endif
 int init_module (void)
 {
+/*
+ * In order for the kallsyms_lookup_name hack to work under ppc64, we need
+ * CONFIG_KALLSYMS_ALL=y.
+ * On ppc64 the kallsyms_lookup_name(.funcname) returns the function entry,
+ * but kallsyms_lookup_name(funcname) returns the function descriptor
+ * (func_descr_t). The latter is what we want, and those symbols are only
+ * available with CONFIG_KALLSYMS_ALL=y.
+ */
   _stp_kta = (int (*)(unsigned long))kallsyms_lookup_name("__kernel_text_address");
 
+#if defined (__powerpc64__)
+_stp_validate_sp = (int (*)(unsigned long, struct task_struct *,
+		unsigned long)) kallsyms_lookup_name("validate_sp");
+#endif
+
 #ifdef SYSTEMTAP
   if (stap_num_symbols > 0)
     _stp_kallsyms_lookup = & _stp_kallsyms_lookup_tabled;