Run elf files

src/emulator/cart.rs

@@ -18,6 +18,7 @@ pub struct Cart {
 impl Cart {
     pub fn load(file_path: &Path, sim_id: SimId) -> Result<Self> {
         let rom = fs::read(file_path)?;
+        let rom = try_parse_elf(&rom).unwrap_or(rom);
 
         let mut sram_file = File::options()
             .read(true)
@@ -55,6 +56,23 @@ impl Cart {
     }
 }
 
+fn try_parse_elf(data: &[u8]) -> Option<Vec<u8>> {
+    let parsed = elf::ElfBytes::<elf::endian::AnyEndian>::minimal_parse(data).ok()?;
+    let mut bytes = vec![];
+    let mut pstart = None;
+    for phdr in parsed.segments()? {
+        if phdr.p_filesz == 0 {
+            continue;
+        }
+        let start = pstart.unwrap_or(phdr.p_paddr);
+        pstart = Some(start);
+        bytes.resize((phdr.p_paddr - start) as usize, 0);
+        let data = parsed.segment_data(&phdr).ok()?;
+        bytes.extend_from_slice(data);
+    }
+    Some(bytes)
+}
+
 fn sram_path(file_path: &Path, sim_id: SimId) -> PathBuf {
     match sim_id {
         SimId::Player1 => file_path.with_extension("p1.sram"),