Add big-endian ints

[xairy]

No description provided.

[dvyukov]

drop this

[xairy]

Done.

[dvyukov]

whenever I will see int8be in syscall description, I will say s/int8be/int8/
int8be is confusing, drop it

[xairy]

Done.

[dvyukov]

drop it along with int8be

[xairy]

Done.

[dvyukov]

Let's give proper size to all types, including syscall arguments.
I don't see why int32be should be prohibited in syscall aguments, but allowed everywhere else. Moreover, syscall arguments do have size -- they are intptr's effectively. Sysgen already makes assumptions about intptr size in sz := int64(64) // TODO: assume that pointer is 8 bytes for now. Add const ptrSize = 8 to sysgen.go and use to give size to all types where size is 0 currently.

[xairy]

Done.

[dvyukov]

lookupConst := ...
and drop the previous line

You may have seen this form with separate declaration and initialization in sys/prog, but it is necessary only when you have recursion (lookupConst would need to call lookupConst). Otherwise you just do f := func(.....

[xairy]

Done.

[dvyukov]

Please let's do just 'BigEndian bool'.
This Endianness Endianness causes too much clutter for no apparent benefit. There are only 2 options, which is naturally represented by a bool. There are multiple copies

    Endianness: LittleEndian,

    Endianness == LittleEndian

    endianness := "LittleEndian"
    if !littleEndian {
        endianness = "BigEndian"
    }

If we do the bool, we can drop:

    endianness := "LittleEndian"
    if !littleEndian {
        endianness = "BigEndian"
    }

entirely, as a bool is correctly printed with %v.

We can also drop Endianness: LittleEndian, initialization, as default value for bool represents our semantic default of having little endian (unless said otherwise).

[xairy]

Done.

[xairy]

PTAL

[dvyukov]

Much nicer now. Thanks!
One small nit.

[dvyukov]

s/value uintptr, size uintptr/value, size uintptr/

[xairy]

Done.

[xairy]

PTAL

[dvyukov]

LGTM