[migrated to blacksky.co.uk] on Nostr: Caleb James DeLisle you know what :scholar: x86 is not fucked up enough ...

Caleb James DeLisle (nprofile…mj4q)
you know what

x86 is not fucked up enough

quoting nevent1q…kntw

The problem with most 32 bit is it's a compatibility layer for old binaries, so it's an older / trashier instruction set.

What I want is 64 bit registers, 64 bit syscalls, entire system is 64 bit, but, you know that you're never going to have a pointer above 2**32 so you can encode pointers as 32 bit values.

It looks like this is possible already, and it's just ABI/compiler/loader shit to make it work.

mmap() already has a flag MAP_32BIT to require that the mapping goes in the lower 32 bits.

It's probably possible to compile libc/linker/loader with like __INTPTR_WIDTH__ 32 and so on, but telling the compiler to make 64 bit assembly 😈 , and then just patch in a syscall shim so that syscalls are done correctly with 64 bit words.