parisc: fix frame pointer in ftrace_regs_caller()

The current code in ftrace_regs_caller() doesn't assign
%r3 to contain the address of the current frame. This
is hidden if the kernel is compiled with FRAME_POINTER,
but without it just crashes because it tries to dereference
an arbitrary address. Fix this by always setting %r3 to the
current stack frame.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 1d1d748c227f075685f79dc327bfc52a029885d1..b96d7449697791260fdf2a28985ba7174f412668 100644 (file)
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -2125,7 +2125,7 @@ ftrace_regs_caller:
        copy    %rp, %r26
        LDREG   -FTRACE_FRAME_SIZE-PT_SZ_ALGN(%sp), %r25
        ldo     -8(%r25), %r25
-       copy    %r3, %arg2
+       ldo     -FTRACE_FRAME_SIZE(%r1), %arg2
        b,l     ftrace_function_trampoline, %rp
        copy    %r1, %arg3 /* struct pt_regs */