On 19/02/15 00:52, Chris Johns wrote:
On 19/02/2015 7:25 am, Joel Sherrill wrote:
Yep. But if all we have is writeable vector tables at 0x0, then it
MIGHT be
ok. GCC may not be able to detect. But on the m68k's without a VBR
register the table is always at 0x0.
Yeap ...
https://git.rtems.org/rtems/commit/?id=dd309b10544bfceda968ac847ad34c3d90ca8281
I hit this one when testing on the mc5235.
This is not a GCC bug. Read/write from/to the 0 address is undefined in
C. I think the only reliable solution for these kind of operations is to
write assembly code or do some tricks that may fail with newer GCC
version or link-time optimization.
See also:
https://git.rtems.org/rtems/commit/?id=95d0c98cac5000da7f4f1fdd52299224b2f94235
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