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authorWu Zhangjin <wuzhangjin@gmail.com>2009-11-20 20:34:36 +0800
committerRalf Baechle <ralf@linux-mips.org>2009-12-17 01:57:25 +0000
commit046199cae714a7f9e88f5a7940b077f4515f48cb (patch)
tree8fb3a93a80fc2f719daa0ac905b610de68cf6693 /arch/mips/kernel/ftrace.c
parente17ff5fec65a0213416efbe7ceae5f2f9887dda2 (diff)
MIPS: Tracing: Make ftrace for MIPS work without -fno-omit-frame-pointer
When remove the -fno-omit-frame-pointer, gcc will not save the frame pointer for us, we need to save one ourselves. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Nicholas Mc Guire <der.herr@hofr.at> Cc: zhangfx@lemote.com Cc: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/679/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/ftrace.c')
-rw-r--r--arch/mips/kernel/ftrace.c56
1 files changed, 41 insertions, 15 deletions
diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c
index e981a497c98..e363fc69aab 100644
--- a/arch/mips/kernel/ftrace.c
+++ b/arch/mips/kernel/ftrace.c
@@ -27,7 +27,13 @@ static unsigned int ftrace_nop = 0x00000000;
static int ftrace_modify_code(unsigned long ip, unsigned int new_code)
{
- *(unsigned int *)ip = new_code;
+ int faulted;
+
+ /* *(unsigned int *)ip = new_code; */
+ safe_store_code(new_code, ip, faulted);
+
+ if (unlikely(faulted))
+ return -EFAULT;
flush_icache_range(ip, ip + 8);
@@ -41,14 +47,20 @@ int ftrace_make_nop(struct module *mod,
struct dyn_ftrace *rec, unsigned long addr)
{
unsigned int new;
+ int faulted;
unsigned long ip = rec->ip;
/* We have compiled module with -mlong-calls, but compiled the kernel
* without it, we need to cope with them respectively. */
if (ip & 0x40000000) {
/* record it for ftrace_make_call */
- if (lui_v1 == 0)
- lui_v1 = *(unsigned int *)ip;
+ if (lui_v1 == 0) {
+ /* lui_v1 = *(unsigned int *)ip; */
+ safe_load_code(lui_v1, ip, faulted);
+
+ if (unlikely(faulted))
+ return -EFAULT;
+ }
/* lui v1, hi_16bit_of_mcount --> b 1f (0x10000004)
* addiu v1, v1, low_16bit_of_mcount
@@ -147,6 +159,7 @@ unsigned long ftrace_get_parent_addr(unsigned long self_addr,
{
unsigned long sp, ip, ra;
unsigned int code;
+ int faulted;
/* in module or kernel? */
if (self_addr & 0x40000000) {
@@ -162,8 +175,11 @@ unsigned long ftrace_get_parent_addr(unsigned long self_addr,
do {
ip -= 4;
- /* get the code at "ip" */
- code = *(unsigned int *)ip;
+ /* get the code at "ip": code = *(unsigned int *)ip; */
+ safe_load_code(code, ip, faulted);
+
+ if (unlikely(faulted))
+ return 0;
/* If we hit the non-store instruction before finding where the
* ra is stored, then this is a leaf function and it does not
@@ -174,11 +190,14 @@ unsigned long ftrace_get_parent_addr(unsigned long self_addr,
} while (((code & S_RA_SP) != S_RA_SP));
sp = fp + (code & OFFSET_MASK);
- ra = *(unsigned long *)sp;
+
+ /* ra = *(unsigned long *)sp; */
+ safe_load_stack(ra, sp, faulted);
+ if (unlikely(faulted))
+ return 0;
if (ra == parent)
return sp;
-
return 0;
}
@@ -193,6 +212,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
struct ftrace_graph_ent trace;
unsigned long return_hooker = (unsigned long)
&return_to_handler;
+ int faulted;
if (unlikely(atomic_read(&current->tracing_graph_pause)))
return;
@@ -206,21 +226,23 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
* ftrace_get_parent_addr() does it!
*/
- old = *parent;
+ /* old = *parent; */
+ safe_load_stack(old, parent, faulted);
+ if (unlikely(faulted))
+ goto out;
parent = (unsigned long *)ftrace_get_parent_addr(self_addr, old,
(unsigned long)parent,
fp);
-
/* If fails when getting the stack address of the non-leaf function's
* ra, stop function graph tracer and return */
- if (parent == 0) {
- ftrace_graph_stop();
- WARN_ON(1);
- return;
- }
+ if (parent == 0)
+ goto out;
- *parent = return_hooker;
+ /* *parent = return_hooker; */
+ safe_store_stack(return_hooker, parent, faulted);
+ if (unlikely(faulted))
+ goto out;
if (ftrace_push_return_trace(old, self_addr, &trace.depth, fp) ==
-EBUSY) {
@@ -235,5 +257,9 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
current->curr_ret_stack--;
*parent = old;
}
+ return;
+out:
+ ftrace_graph_stop();
+ WARN_ON(1);
}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */