From 0e9db4d0020415a0db1b8aecbd86009a45b35668 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Tue, 7 Feb 2017 21:01:01 +1100 Subject: [PATCH] powerpc/powernv: Fix opal_exit tracepoint opcode Currently the opal_exit tracepoint usually shows the opcode as 0: -0 [047] d.h. 635.654292: opal_entry: opcode=63 -0 [047] d.h. 635.654296: opal_exit: opcode=0 retval=0 kopald-1209 [019] d... 636.420943: opal_entry: opcode=10 kopald-1209 [019] d... 636.420959: opal_exit: opcode=0 retval=0 This is because we incorrectly load the opcode into r0 before calling __trace_opal_exit(), whereas it expects the opcode in r3 (first function parameter). In fact we are leaving the retval in r3, so opcode and retval will always show the same value. Instead load the opcode into r3, resulting in: -0 [040] d.h. 636.618625: opal_entry: opcode=63 -0 [040] d.h. 636.618627: opal_exit: opcode=63 retval=0 Fixes: 9b92db512268 ("powernv: Add OPAL tracepoints") Signed-off-by: Michael Ellerman --- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S index f7c19c9c57ed9..63fe1b2b11755 100644 --- a/arch/powerpc/platforms/powernv/opal-wrappers.S +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S @@ -146,7 +146,7 @@ opal_tracepoint_entry: opal_tracepoint_return: std r3,STK_REG(R31)(r1) mr r4,r3 - ld r0,STK_REG(R23)(r1) + ld r3,STK_REG(R23)(r1) bl __trace_opal_exit ld r3,STK_REG(R31)(r1) addi r1,r1,STACKFRAMESIZE -- 2.39.5