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[for-5.2,v3,3/4] hw/net/can/ctucan_core: Handle big-endian hosts

Message ID 61096a9130b50e74e03914fcbfbb7bc759f5b6b5.1605044619.git.pisa@cmp.felk.cvut.cz
State New
Headers show
Series [for-5.2,v3,1/4] hw/net/can/ctucan: Don't allow guest to write off end of tx_buffer | expand

Commit Message

Pavel Pisa Nov. 10, 2020, 9:52 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>

---
 hw/net/can/ctucan_core.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

-- 
2.20.1
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Patch

diff --git a/hw/net/can/ctucan_core.h b/hw/net/can/ctucan_core.h
index f21cb1c5ec..bbc09ae067 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