Finish 2-pass (#223)

.github/workflows/ci.yml

@@ -54,3 +54,4 @@ jobs:
         run: rustup target add riscv32i-unknown-none-elf
 
       - run: cargo test -r --all --all-features
+        timeout-minutes: 30

common/src/constants/constants.rs

@@ -0,0 +1,2 @@
+pub const MEMORY_TOP: u32 = 0x80400000;
+pub const WORD_SIZE: usize = 4;

common/src/constants/mod.rs

@@ -0,0 +1,2 @@
+pub mod constants;
+pub use constants::*;

common/src/lib.rs

@@ -1,3 +1,4 @@
+pub mod constants;
 pub mod cpu;
 pub mod error;
 pub mod memory;

common/src/memory/alignment.rs

@@ -0,0 +1,34 @@
+// use crate::constants::WORD_SIZE;
+
+#[macro_export]
+macro_rules! word_align {
+    ($len:expr) => {
+        ($len + $crate::constants::WORD_SIZE - 1) & !($crate::constants::WORD_SIZE - 1)
+    };
+}
+
+#[macro_export]
+macro_rules! bytes_to_words {
+    ($bytes:expr) => {{
+        // Convert the associated data to word representation.
+        let mut bytes = $bytes.to_vec();
+        let padded_len = $crate::word_align!(bytes.len());
+        bytes.resize(padded_len, 0);
+        // Convert to u32 chunks.
+        bytes
+            .chunks($crate::constants::WORD_SIZE)
+            .map(|chunk| u32::from_le_bytes([chunk[0], chunk[1], chunk[2], chunk[3]]))
+            .collect::<Vec<u32>>()
+    }};
+}
+
+#[macro_export]
+macro_rules! words_to_bytes {
+    ($words:expr) => {{
+        let mut bytes: Vec<u8> = Vec::with_capacity($words.len() * $crate::constants::WORD_SIZE);
+        for word in $words {
+            bytes.extend_from_slice(&word.to_le_bytes());
+        }
+        bytes
+    }};
+}

common/src/memory/mod.rs

@@ -1,2 +1,4 @@
+pub mod alignment;
+pub use alignment::*;
 pub mod traits;
 pub use traits::*;