From 93c53657c2289e979672ee6c4612af7e9eac109c Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
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/Cargo.toml       | 14 ++++++++++++++
 ffi/multiarch/src/lib.rs       |  0
 ffi/multiarch/src/long_mode.rs | 43 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+)
 create mode 100644 ffi/multiarch/Cargo.toml
 create mode 100644 ffi/multiarch/src/lib.rs
 create mode 100644 ffi/multiarch/src/long_mode.rs

(limited to 'ffi/multiarch')

diff --git a/ffi/multiarch/Cargo.toml b/ffi/multiarch/Cargo.toml
new file mode 100644
index 0000000..c6609d2
--- /dev/null
+++ b/ffi/multiarch/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "yaxpeax_x86_ffi_multiarch"
+version = "0.0.2"
+authors = ["iximeow <me@iximeow.net>"]
+edition = "2018"
+
+[dependencies]
+yaxpeax-x86 = { path = "../../", default-features = false }
+yaxpeax-arch = { version = "0.0.4", default-features = false }
+
+[lib]
+name = "yaxpeax_x86_ffi_multiarch"
+path = "src/lib.rs"
+crate-type = ["staticlib"]
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);
+    <amd64::Arch as Arch>::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();
+    }
+}
-- 
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