add mips-build job, remove dead coe in elf_loader

.github/workflows/mips-build.yml

@@ -0,0 +1,55 @@
+name: MIPS Build and Package
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - 'o1vm/resources/programs/mips/**'
+      - 'Makefile'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust_toolchain_version: ["1.74"]
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: 'recursive'
+
+    - name: Cache apt packages
+      id: apt-cache
+      uses: actions/cache@v4
+      with:
+        path: |
+          /var/cache/apt/archives/*.deb
+        key: ${{ runner.os }}-apt-${{ hashFiles('.github/workflows/mips-build.yml') }}
+
+    - name: Install MIPS tools
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y binutils-mips-linux-gnu
+
+    - name: Build MIPS programs
+      run: make build-mips-programs
+
+    - name: Use shared Rust toolchain setting up steps
+      uses: ./.github/actions/toolchain-shared
+      with:
+        rust_toolchain_version: ${{ matrix.rust_toolchain_version }}
+
+    - name: Test elf_loader against mips programs
+      run: ./o1vm/test-gen-state-json.sh
+
+    - name: Create tar archive
+      run: |
+        cd o1vm/resources/programs/mips
+        tar -czf mips-binaries.tar.gz bin/
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: mips-binaries
+        path: o1vm/resources/programs/mips/mips-binaries.tar.gz

o1vm/src/elf_loader.rs

@@ -84,22 +84,16 @@ pub fn make_state<T: EndianParse>(file: ElfBytes<T>) -> Result<State, String> {
                 .copy_from_slice(&text_section_data[0..data_length]);
             data_offset += data_length;
         } else {
+            let data_length = if page_index == last_page_index {
+                code_section_end_address - end_page_address
+            } else {
+                page_size_usize
+            };
             let page_offset = if page_index == first_page_index {
                 code_section_starting_address - start_page_address
             } else {
                 0
             };
-            let data_length = if page_index == last_page_index {
-                let data_length = code_section_end_address - end_page_address;
-                // for the last page, we might need to pad with zeros if the text_section_data is not
-                // a multiple of the page size.
-                if page_size_usize > data_length {
-                    data[page_offset + data_length..page_offset + page_size_usize].fill(0);
-                }
-                data_length
-            } else {
-                page_size_usize
-            };
             data[page_offset..page_offset + data_length]
                 .copy_from_slice(&text_section_data[data_offset..data_offset + data_length]);