wali-linux 0.2.0

Syscall definitions and ABI for the WebAssembly Linux Interface (WALI)

WebAssembly Linux Interface

Syscall definitions and ABI type system for the WebAssembly Linux Interface (WALI).

This package is the machine-readable source of truth for all syscalls and auxillary methods (with arguments types, names, and per-architecture Linux syscall numbers). It also contains the ABI with exact byte-level layouts of all relevant types.

This package is intended for building WALI spec-related tooling: code generators, bindings, validators, documentation, etc.

Install

pip install wali-linux

Usage

from wali.spec import SYSCALLS, AUX_SYSCALLS, TypeRegistry

# Syscall metadata
read = SYSCALLS["read"]
read.nr                 # 0  (x86_64 number)
read.nrs.arm64          # 63
read.args               # ['int', 'void*', 'size_t']
read.args_id            # ['fd', 'buf', 'count']
read.implemented        # True

# ABI type layout
TypeRegistry.resolve_size("struct stat")       # 144
TypeRegistry.resolve_primitive("off_t")         # Primitive(size=8, signed=True)

stat = TypeRegistry.struct_defs["struct stat"]
for f, off, sz in zip(stat.fields, stat.field_offsets, stat.field_sizes):
    print(f"+{off:>3}  {f.name:<12} {f.type_name:<16} ({sz} bytes)")

Public API

Specification-related information is available in the wali.spec namespace

Name	Description
SYSCALLS	dict[str, Syscall] of all defined Linux syscalls
AUX_SYSCALLS	dict[str, AuxSyscall] of WALI auxiliary calls
TypeRegistry	ABI type system: primitives, aliases, arrays, structs, and layout resolution
Primitive, ArrayType, StructField	type-system dataclasses