From 93c53657c2289e979672ee6c4612af7e9eac109c Mon Sep 17 00:00:00 2001 From: iximeow Date: Sat, 13 Mar 2021 14:19:55 -0800 Subject: split ffi crate to support distinct 16, 32, and 64-bit builds initial work to optionally discard any instruction printing support when using `-Z build-std` to fully remove .eh_frame, a stripped long_mode_no_fmt .so is 61kb! --- ffi/multiarch/src/lib.rs | 0 ffi/multiarch/src/long_mode.rs | 43 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+) create mode 100644 ffi/multiarch/src/lib.rs create mode 100644 ffi/multiarch/src/long_mode.rs (limited to 'ffi/multiarch/src') diff --git a/ffi/multiarch/src/lib.rs b/ffi/multiarch/src/lib.rs new file mode 100644 index 0000000..e69de29 diff --git a/ffi/multiarch/src/long_mode.rs b/ffi/multiarch/src/long_mode.rs new file mode 100644 index 0000000..c0d422b --- /dev/null +++ b/ffi/multiarch/src/long_mode.rs @@ -0,0 +1,43 @@ +#![no_std] +#![feature(lang_items)] + +#[panic_handler] +#[cold] +fn panic(_panic: &core::panic::PanicInfo) -> ! { + loop {} +} + +#[lang = "eh_personality"] extern fn eh_personality() {} + +use yaxpeax_arch::{Arch, Decoder, LengthedInstruction, AddressBase}; +use yaxpeax_x86::long_mode as amd64; + +#[no_mangle] +pub unsafe extern "C" fn yaxpeax_decode_x86_64_optimistic(data: *const u8, length: u64, inst: *mut amd64::Instruction) -> bool { + let inst: &mut amd64::Instruction = core::mem::transmute(inst); + ::Decoder::default().decode_into(inst, core::slice::from_raw_parts(data as *const u8, length as usize).iter().cloned()).is_err() +} + +#[no_mangle] +pub unsafe extern "C" fn yaxpeax_instr_length_x86_64(inst: *mut amd64::Instruction) -> usize { + let inst: &mut amd64::Instruction = core::mem::transmute(inst); + 0.wrapping_offset(inst.len()).to_linear() +} + +#[cfg(fmt)] +mod write_sink; + +#[cfg(fmt)] +mod fmt { + use write_sink::InstructionSink; + + use core::fmt::Write; + + #[no_mangle] + pub unsafe extern "C" fn yaxpeax_instr_fmt(inst: *mut amd64::Instruction, text: *mut u8, len: usize) { + let inst: &mut amd64::Instruction = core::mem::transmute(inst); + let res = core::slice::from_raw_parts_mut(text, len); + + write!(InstructionSink { buf: res, offs: 0 }, "{}", inst).unwrap(); + } +} -- cgit v1.1