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[PULL,16/17] hw/net/can/ctucan_core: Handle big-endian hosts

Message ID 1605100301-11317-17-git-send-email-jasowang@redhat.com
State New
Headers show
Series [PULL,01/17] virtio-net: Set mac address to hardware if the peer is vdpa | expand

Commit Message

Jason Wang Nov. 11, 2020, 1:11 p.m. UTC
From: Peter Maydell <peter.maydell@linaro.org>

The ctucan driver defines types for its registers which are a union
of a uint32_t with a struct with bitfields for the individual
fields within that register. This is a bad idea, because bitfields
aren't portable. The ctu_can_fd_regs.h header works around the
most glaring of the portability issues by defining the
fields in two different orders depending on the setting of the
__LITTLE_ENDIAN_BITFIELD define. However, in ctucan_core.h this
is unconditionally set to 1, which is wrong for big-endian hosts.

Set it only if HOST_WORDS_BIGENDIAN is not set. There is no need
for a "have we defined it already" guard, because the only place
that should set it is ctucan_core.h, which has the usual
double-inclusion guard.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Acked-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Tested-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/can/ctucan_core.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
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Patch

diff --git a/hw/net/can/ctucan_core.h b/hw/net/can/ctucan_core.h
index f21cb1c..bbc09ae 100644
--- a/hw/net/can/ctucan_core.h
+++ b/hw/net/can/ctucan_core.h
@@ -31,8 +31,7 @@ 
 #include "exec/hwaddr.h"
 #include "net/can_emu.h"
 
-
-#ifndef __LITTLE_ENDIAN_BITFIELD
+#ifndef HOST_WORDS_BIGENDIAN
 #define __LITTLE_ENDIAN_BITFIELD 1
 #endif