tool: add support for split program image

Signed-off-by: Nick Spinale <nick@nickspinale.com>

Author: nspin

tool/microkit/src/elf.rs

@@ -4,6 +4,7 @@
 // SPDX-License-Identifier: BSD-2-Clause
 //
 
+use std::borrow::Cow;
 use std::fs;
 use std::path::Path;
 use std::collections::HashMap;
@@ -144,9 +145,21 @@ pub struct ElfFile {
 
 impl ElfFile {
     pub fn from_path(path: &Path) -> Result<ElfFile, String> {
+        Self::from_split_paths(path, None)
+    }
+
+    pub fn from_split_paths(path: &Path, path_for_symbols: Option<&Path>) -> Result<ElfFile, String> {
         let reader = ElfFileReader::from_path(path)?;
+        let reader_for_symbols = match path_for_symbols {
+            Some(path_for_symbols) => {
+                Cow::Owned(ElfFileReader::from_path(path_for_symbols)?)
+            }
+            None => {
+                Cow::Borrowed(&reader)
+            }
+        };
         let segments = reader.segments();
-        let symbols = reader.symbols()?;
+        let symbols = reader_for_symbols.symbols()?;
         Ok(ElfFile {
             word_size: reader.word_size(),
             entry: reader.file_header().entry,
@@ -193,6 +206,7 @@ impl ElfFile {
     }
 }
 
+#[derive(Clone)]
 struct ElfFileReader<'a> {
     path: &'a Path,
     bytes: Vec<u8>,

tool/microkit/src/main.rs

@@ -700,7 +700,12 @@ fn build_system(kernel_config: &Config,
     for pd in &system.protection_domains {
         match get_full_path(&pd.program_image, search_paths) {
             Some(path) => {
-                let elf = ElfFile::from_path(&path).unwrap();
+                let path_for_symbols = pd.program_image_for_symbols.as_ref().map(|path_suffix| {
+                    get_full_path(path_suffix, search_paths).ok_or_else(|| {
+                        format!("unable to find program image for symbols: '{}'", path_suffix.display())
+                    })
+                }).transpose()?;
+                let elf = ElfFile::from_split_paths(&path, path_for_symbols.as_deref()).unwrap();
                 pd_elf_files.push(elf);
             },
             None => return Err(format!("unable to find program image: '{}'", pd.program_image.display()))

tool/microkit/src/sysxml.rs

@@ -152,6 +152,7 @@ pub struct ProtectionDomain {
     pub pp: bool,
     pub passive: bool,
     pub program_image: PathBuf,
+    pub program_image_for_symbols: Option<PathBuf>,
     pub maps: Vec<SysMap>,
     pub irqs: Vec<SysIrq>,
     pub setvars: Vec<SysSetVar>,
@@ -303,6 +304,7 @@ impl ProtectionDomain {
         let mut child_pds = Vec::new();
 
         let mut program_image = None;
+        let mut program_image_for_symbols = None;
         let mut virtual_machine = None;
 
         // Default to minimum priority
@@ -323,13 +325,15 @@ impl ProtectionDomain {
 
             match child.tag_name().name() {
                 "program_image" => {
-                    check_attributes(xml_sdf, &child, &["path"])?;
+                    check_attributes(xml_sdf, &child, &["path", "path_for_symbols"])?;
                     if program_image.is_some() {
                         return Err(value_error(xml_sdf, node, "program_image must only be specified once".to_string()));
                     }
 
                     let program_image_path = checked_lookup(xml_sdf, &child, "path")?;
                     program_image = Some(Path::new(program_image_path).to_path_buf());
+
+                    program_image_for_symbols = child.attribute("path_for_symbols").map(PathBuf::from);
                 },
                 "map" => {
                     let map = SysMap::from_xml(xml_sdf, &child, true)?;
@@ -415,6 +419,7 @@ impl ProtectionDomain {
             pp,
             passive,
             program_image: program_image.unwrap(),
+            program_image_for_symbols,
             maps,
             irqs,
             setvars,