On Mon, Jul 10, 2023 at 2:58 PM Will Hawkins <hawkinsw@xxxxxx> wrote: > > In the documentation of the eBPF ISA it is unspecified how integers are > represented. Specify that twos complement is used. > > Signed-off-by: Will Hawkins <hawkinsw@xxxxxx> > --- > Documentation/bpf/instruction-set.rst | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/Documentation/bpf/instruction-set.rst b/Documentation/bpf/instruction-set.rst > index 751e657973f0..63dfcba5eb9a 100644 > --- a/Documentation/bpf/instruction-set.rst > +++ b/Documentation/bpf/instruction-set.rst > @@ -173,6 +173,11 @@ BPF_ARSH 0xc0 sign extending dst >>= (src & mask) > BPF_END 0xd0 byte swap operations (see `Byte swap instructions`_ below) > ======== ===== ========================================================== > > +eBPF supports 32- and 64-bit signed and unsigned integers. It does > +not support floating-point data types. All signed integers are represented in > +twos-complement format where the sign bit is stored in the most-significant > +bit. Could you point to another ISA document (like x86, arm, ...) that talks about signed and unsigned integers? -- Bpf mailing list Bpf@xxxxxxxx https://www.ietf.org/mailman/listinfo/bpf
