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authoriximeow <me@iximeow.net>2021-03-13 14:19:55 -0800
committeriximeow <me@iximeow.net>2021-03-13 14:54:47 -0800
commit93c53657c2289e979672ee6c4612af7e9eac109c (patch)
treea0acdc143595f64a796827bc849a122dd49cc4e3 /ffi/multiarch/src/long_mode.rs
parent6232e8b1daf7067cb2e8065687530d5f88ecb46d (diff)
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!
Diffstat (limited to 'ffi/multiarch/src/long_mode.rs')
-rw-r--r--ffi/multiarch/src/long_mode.rs43
1 files changed, 43 insertions, 0 deletions
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();
+ }
+}