misc changes

Cargo.toml

@@ -7,8 +7,6 @@ edition = "2018"
 [dependencies]
 gimli = { version = "0.25.0", default-features = false, features = ["read"] }
 libc = "0.2"
-fallible-iterator = "0.1"
-log = "0.4"
 once_cell = "1.8"
 
 [profile.release]

src/arch/x86_64.rs

@@ -11,6 +11,13 @@ pub struct Context {
     pub fcw: usize,
 }
 
+pub struct Arch;
+
+impl Arch {
+    pub const SP: Register = X86_64::RSP;
+    pub const RA: Register = X86_64::RA;
+}
+
 impl fmt::Debug for Context {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         let mut fmt = fmt.debug_struct("Context");
@@ -84,7 +91,6 @@ pub extern "C-unwind" fn save_context() -> Context {
 
 #[naked]
 pub unsafe extern "C" fn restore_context(ctx: &Context) -> ! {
-    // No need to save caller-saved registers here.
     asm!(
         "
         /* Restore stack */

src/find_fde/mod.rs

@@ -4,6 +4,7 @@ mod registry;
 use crate::util::*;
 use gimli::{BaseAddresses, EhFrame, FrameDescriptionEntry};
 
+#[derive(Debug)]
 pub struct FDESearchResult {
     pub fde: FrameDescriptionEntry<StaticSlice>,
     pub bases: BaseAddresses,

src/lib.rs

@@ -1,3 +1,8 @@
+#![feature(c_unwind)]
+#![feature(naked_functions)]
+#![feature(asm)]
+#![allow(unused_unsafe)]
+
 mod arch;
 mod find_fde;
 mod util;