Support running/profiling ISX files

src/emulator/game_info.rs

@@ -14,7 +14,7 @@ pub struct GameInfo {
 }
 
 impl GameInfo {
-    pub fn new(file_path: &Path, input: &[u8]) -> Result<Self> {
+    pub fn from_elf(file_path: &Path, input: &[u8]) -> Result<Self> {
         let file = object::File::parse(input)?;
 
         let (name, path) = name_and_path(file_path);
@@ -52,6 +52,26 @@ impl GameInfo {
         })
     }
 
+    pub fn from_isx(file_path: &Path, input: &[u8]) -> Self {
+        let (name, path) = name_and_path(file_path);
+        let symbols = extract_isx_symbols(input);
+        let library_info = LibraryInfo {
+            name: name.clone(),
+            debug_name: name,
+            path: path.clone(),
+            debug_path: path,
+            debug_id: DebugId::default(),
+            code_id: None,
+            arch: None,
+            symbol_table: symbols.map(|syms| Arc::new(SymbolTable::new(syms))),
+        };
+        let inline_stack_map = InlineStackMap::empty();
+        Self {
+            library_info,
+            inline_stack_map,
+        }
+    }
+
     pub fn empty(file_path: &Path) -> Self {
         let (name, path) = name_and_path(file_path);
         let library_info = LibraryInfo {
@@ -115,6 +135,66 @@ fn build_inline_stack_map(file: object::File) -> Result<InlineStackMap> {
     Ok(frames.build())
 }
 
+fn extract_isx_symbols(input: &[u8]) -> Option<Vec<Symbol>> {
+    let mut syms = vec![];
+    let (_, mut buf) = input.split_at_checked(32)?;
+    while !buf.is_empty() {
+        let typ;
+        (typ, buf) = buf.split_first()?;
+        match typ {
+            0x11 => {
+                // Code (Virtual Boy)
+                (_, buf) = buf.split_at_checked(4)?;
+                let len_bytes;
+                (len_bytes, buf) = buf.split_first_chunk()?;
+                let len = u32::from_le_bytes(*len_bytes);
+                (_, buf) = buf.split_at_checked(len as usize)?;
+            }
+            0x13 => {
+                // Range (Virtual Boy)
+                let count_bytes;
+                (count_bytes, buf) = buf.split_first_chunk()?;
+                let count = u16::from_le_bytes(*count_bytes) + 1;
+                (_, buf) = buf.split_at_checked(count as usize * 9)?;
+            }
+            0x14 => {
+                // Symbol (Virtual Boy)
+                let count_bytes;
+                (count_bytes, buf) = buf.split_first_chunk()?;
+                let count = u16::from_le_bytes(*count_bytes) + 1;
+                for _ in 0..count {
+                    let name_len;
+                    (name_len, buf) = buf.split_first()?;
+                    let name_bytes;
+                    (name_bytes, buf) = buf.split_at_checked(*name_len as usize)?;
+                    (_, buf) = buf.split_at_checked(2)?;
+                    let address_bytes;
+                    (address_bytes, buf) = buf.split_first_chunk()?;
+
+                    let name_str = String::from_utf8_lossy(name_bytes);
+                    let address = u32::from_le_bytes(*address_bytes);
+                    syms.push(Symbol {
+                        address,
+                        size: Some(4),
+                        name: demangle_any(&name_str),
+                    });
+                }
+            }
+            0x20 | 0x21 | 0x22 => {
+                // System (undocumented)
+                let length_bytes;
+                (length_bytes, buf) = buf.split_first_chunk()?;
+                let length = u32::from_le_bytes(*length_bytes);
+                (_, buf) = buf.split_at_checked(length as usize)?;
+            }
+            _ => {
+                return None;
+            }
+        }
+    }
+    Some(syms)
+}
+
 type Reader<'a> = gimli::EndianSlice<'a, gimli::RunTimeEndian>;
 
 struct ParseContext<'a> {