- abort() body: use signal::sys::SIGABRT (the platform-independent name
the signal module uses for both linux and redox submodules)
- call sites: wrap abort() in unsafe { } blocks (Rust 2024 edition's
unsafe_op_in_unsafe_fn lint makes this mandatory inside unsafe fns)
- stdlib/mod.rs, start.rs: drop now-unused 'intrinsics' import
Previously abort() called core::intrinsics::abort() which compiles to
the ud2 instruction, generating an Invalid Opcode fault. The kernel
logs this as 'UNHANDLED EXCEPTION' and kills the process, but the
fault message is alarming and doesn't reflect the actual intent
(SIGABRT from process self-termination).
This change uses the POSIX-compliant abort sequence: raise(SIGABRT)
first (default handler terminates the process), then _Exit(134) as
fallback if the signal handler returns. Six sites updated:
stdlib abort, assert __assert_fail, lib.rs relibc_panic/oom/_Unwind_Resume,
start.rs relibc_verify_host.
The proc-manager-fallback in redox-rt/src/sys.rs retains
core::intrinsics::abort() — that path is a true 'system unreachable'
last resort where raise/_Exit cannot succeed.
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