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authorDavid S. Miller <davem@davemloft.net>2010-03-29 13:08:52 -0700
committerDavid S. Miller <davem@davemloft.net>2010-03-29 13:08:52 -0700
commit9e8307ecaf9f8c8b5b3b22145021204c4e73114a (patch)
treed0361a2e093120880adecbd87c1f0f26a57541e9
parentd2566af8c4860a03ca685ef0910de406679c3e4e (diff)
sparc64: Properly truncate pt_regs framepointer in perf callback.
For 32-bit processes, we save the full 64-bits of the regs in pt_regs. But unlike when the userspace actually does load and store instructions, the top 32-bits don't get automatically truncated by the cpu in kernel mode (because the kernel doesn't execute with PSTATE_AM address masking enabled). So we have to do it by hand. Reported-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--arch/sparc/kernel/perf_event.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index 9f2b2bac8b2..610112ec518 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -1337,7 +1337,7 @@ static void perf_callchain_user_32(struct pt_regs *regs,
callchain_store(entry, PERF_CONTEXT_USER);
callchain_store(entry, regs->tpc);
- ufp = regs->u_regs[UREG_I6];
+ ufp = regs->u_regs[UREG_I6] & 0xffffffffUL;
do {
struct sparc_stackf32 *usf, sf;
unsigned long pc;