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-rw-r--r--kernel/extable.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/kernel/extable.c b/kernel/extable.c
index a26cb2e17023..e136ed8d82ba 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -17,6 +17,7 @@
17*/ 17*/
18#include <linux/module.h> 18#include <linux/module.h>
19#include <linux/init.h> 19#include <linux/init.h>
20#include <linux/ftrace.h>
20#include <asm/uaccess.h> 21#include <asm/uaccess.h>
21#include <asm/sections.h> 22#include <asm/sections.h>
22 23
@@ -40,7 +41,7 @@ const struct exception_table_entry *search_exception_tables(unsigned long addr)
40 return e; 41 return e;
41} 42}
42 43
43int core_kernel_text(unsigned long addr) 44__notrace_funcgraph int core_kernel_text(unsigned long addr)
44{ 45{
45 if (addr >= (unsigned long)_stext && 46 if (addr >= (unsigned long)_stext &&
46 addr <= (unsigned long)_etext) 47 addr <= (unsigned long)_etext)
@@ -53,7 +54,7 @@ int core_kernel_text(unsigned long addr)
53 return 0; 54 return 0;
54} 55}
55 56
56int __kernel_text_address(unsigned long addr) 57__notrace_funcgraph int __kernel_text_address(unsigned long addr)
57{ 58{
58 if (core_kernel_text(addr)) 59 if (core_kernel_text(addr))
59 return 1; 60 return 1;
@@ -66,3 +67,19 @@ int kernel_text_address(unsigned long addr)
66 return 1; 67 return 1;
67 return module_text_address(addr) != NULL; 68 return module_text_address(addr) != NULL;
68} 69}
70
71/*
72 * On some architectures (PPC64, IA64) function pointers
73 * are actually only tokens to some data that then holds the
74 * real function address. As a result, to find if a function
75 * pointer is part of the kernel text, we need to do some
76 * special dereferencing first.
77 */
78int func_ptr_is_kernel_text(void *ptr)
79{
80 unsigned long addr;
81 addr = (unsigned long) dereference_function_descriptor(ptr);
82 if (core_kernel_text(addr))
83 return 1;
84 return module_text_address(addr) != NULL;
85}