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authorDavid S. Miller <davem@davemloft.net>2010-04-21 03:08:11 -0700
committerDavid S. Miller <davem@davemloft.net>2010-04-21 03:08:11 -0700
commit667f0cee3e0321151aa7a1a5222afe67ca4be0ea (patch)
tree5f4a7a5c228a21e893f95774ca95f9925abf4b1f /arch/sparc/kernel/perf_event.c
parent87e8f0e3e6d0b720a2462ebc5667eaa462752f74 (diff)
sparc64: Fix stack dumping and tracing when function graph is enabled.
Like x86, when the function graph tracer is enabled, emit the ftrace stub as well as the program counter it will be transformed back into. We duplicate a lot of similar stack walking logic in 3 or 4 spots, so eventually we should consolidate things like x86 does. Thanks to Frederic Weisbecker for pointing this out. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/perf_event.c')
-rw-r--r--arch/sparc/kernel/perf_event.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index e2771939341d..34ce49f80eac 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -14,6 +14,7 @@
#include <linux/perf_event.h>
#include <linux/kprobes.h>
+#include <linux/ftrace.h>
#include <linux/kernel.h>
#include <linux/kdebug.h>
#include <linux/mutex.h>
@@ -1276,6 +1277,9 @@ static void perf_callchain_kernel(struct pt_regs *regs,
struct perf_callchain_entry *entry)
{
unsigned long ksp, fp;
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ int graph = 0;
+#endif
callchain_store(entry, PERF_CONTEXT_KERNEL);
callchain_store(entry, regs->tpc);
@@ -1303,6 +1307,16 @@ static void perf_callchain_kernel(struct pt_regs *regs,
fp = (unsigned long)sf->fp + STACK_BIAS;
}
callchain_store(entry, pc);
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ if ((pc + 8UL) == (unsigned long) &return_to_handler) {
+ int index = current->curr_ret_stack;
+ if (current->ret_stack && index >= graph) {
+ pc = current->ret_stack[index - graph].ret;
+ callchain_store(entry, pc);
+ graph++;
+ }
+ }
+#endif
} while (entry->nr < PERF_MAX_STACK_DEPTH);
}