Heiko Carstens 3af57f78c3 s390/bpf,jit: fix 32 bit divisions, use unsigned divide instructions ... The s390 bpf jit compiler emits the signed divide instructions "dr" and "d" for unsigned divisions. This can cause problems: the dividend will be zero extended to a 64 bit value and the divisor is the 32 bit signed value as specified A or X accumulator, even though A and X are supposed to be treated as unsigned values. The divide instrunctions will generate an exception if the result cannot be expressed with a 32 bit signed value. This is the case if e.g. the dividend is 0xffffffff and the divisor either 1 or also 0xffffffff (signed: -1). To avoid all these issues simply use unsigned divide instructions. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-01-17 18:54:49 -08:00
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bpf_jit_comp.c	s390/bpf,jit: fix 32 bit divisions, use unsigned divide instructions	2014-01-17 18:54:49 -08:00
bpf_jit.S
Makefile