From f71937d4bb74ad0ba8937da94643ddfe403ea346 Mon Sep 17 00:00:00 2001
From: David Li <li.davidm96@gmail.com>
Date: Mon, 4 Jan 2016 13:43:41 -0700
Subject: Load ELF directly

---
 src/lib.rs                    | 55 ++++++++++++++++++-------------------------
 src/rust-elfloader/src/lib.rs |  4 ++++
 src/simulator.rs              |  8 ++-----
 3 files changed, 29 insertions(+), 38 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 1a176fd..c3fa51b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -20,30 +20,12 @@ pub mod binary;
 pub mod memory;
 pub mod simulator;
 
-#[test]
-fn it_works() {
-    use std::rc::Rc;
-    use std::cell::RefCell;
-
-    use std::path::Path;
-    match binary::Binary::new_from_hex_file(Path::new("../riscv/kernel.hex")) {
-        Ok(b) => {
-            let mmu = memory::IdentityMmu::new();
-            let memory = memory::Memory::new_from_binary(0x2000, b);
-            let memory_ref = Rc::new(RefCell::new(Box::new(memory) as Box<memory::MemoryInterface>));
-            let cache = Rc::new( RefCell::new( Box::new( memory::DirectMappedCache::new(4, 4, memory_ref.clone())) as Box<memory::MemoryInterface>) );
-            let core = simulator::Core::new(cache.clone(), Box::new(mmu));
-            let mut simulator = simulator::Simulator::new(vec![core], memory_ref.clone());
-            simulator.run();
-        },
-        Err(err) => println!("Error: {:?}", err),
-    }
-}
-
 #[test]
 fn test_elfloader() {
     use std::io::prelude::*;
     use std::fs::File;
+    use std::rc::Rc;
+    use std::cell::RefCell;
     extern crate elfloader;
 
     let mut f = File::open("../riscv/kernel").unwrap();
@@ -52,23 +34,32 @@ fn test_elfloader() {
     f.read_to_end(&mut buffer).unwrap();
 
     let elf = elfloader::ElfBinary::new("test", &buffer).unwrap();
-    println!("HEADERS");
-    for p in elf.program_headers() {
-        println!("{}", p);
-    }
+    let start = elf.file_header().entry as isa::Address;
+
+    let mut text = None;
+    let mut data = None;
     for p in elf.section_headers() {
-        println!("{}", p);
         if p.name.0 == 0x1b {
-            let data = elf.section_data(p);
-            print!("\t");
-            for x in data[0..8].iter() {
-                print!("{:02x}", x);
-            }
-            println!("");
+            text = Some((elf.section_data(p), p.addr));
+        }
+        else if p.name.0 == 0x33 {
+            data = Some((elf.section_data(p), p.addr));
         }
     }
 
-    println!("{:?}", elf);
+    let (text, text_offset) = text.unwrap();
+    let (data, data_offset) = data.unwrap();
+
+    let mmu = memory::IdentityMmu::new();
+    let memory = memory::Memory::new_from_text_and_data(
+        0x8000,
+        text, text_offset as usize,
+        data, data_offset as usize);
+    let memory_ref = Rc::new(RefCell::new(Box::new(memory) as Box<memory::MemoryInterface>));
+    let cache = Rc::new( RefCell::new( Box::new( memory::DirectMappedCache::new(4, 4, memory_ref.clone())) as Box<memory::MemoryInterface>) );
+    let core = simulator::Core::new(start, cache.clone(), Box::new(mmu));
+    let mut simulator = simulator::Simulator::new(vec![core], memory_ref.clone());
+    simulator.run();
 }
 
 #[cfg(test)]
diff --git a/src/rust-elfloader/src/lib.rs b/src/rust-elfloader/src/lib.rs
index e344bcb..92cae24 100644
--- a/src/rust-elfloader/src/lib.rs
+++ b/src/rust-elfloader/src/lib.rs
@@ -58,6 +58,10 @@ impl<'s> ElfBinary<'s> {
         None
     }
 
+    pub fn file_header(&self) -> &'s elf::FileHeader {
+        self.header
+    }
+
     /// Print the program headers.
     pub fn print_program_headers(&self) {
         for p in self.program_headers() {
diff --git a/src/simulator.rs b/src/simulator.rs
index f92d3d2..571fafe 100644
--- a/src/simulator.rs
+++ b/src/simulator.rs
@@ -75,9 +75,9 @@ impl RegisterFile {
 
 impl<'a> Core<'a> {
     // TODO: take Rc<RefCell<>> to Memory as well?
-    pub fn new(cache: SharedMemory<'a>, mmu: Box<Mmu + 'a>) -> Core<'a> {
+    pub fn new(entry: isa::Address, cache: SharedMemory<'a>, mmu: Box<Mmu + 'a>) -> Core<'a> {
         Core {
-            pc: 0x1002c, // TODO: hardcoded: fix later
+            pc: entry,
             registers: RegisterFile::new(),
             stall: 0,
             running: true,
@@ -361,10 +361,6 @@ impl<'a> Simulator<'a> {
     }
 
     pub fn run(&mut self) {
-        // hardcode _start
-        self.cores[0].pc = 0x1002C;
-        // hardcode GP
-        self.cores[0].registers.write_word(isa::Register::X3, 0x108D0);
         // hardcode SP
         self.cores[0].registers.write_word(isa::Register::X2, 0x7FFC);
         let mut total_cycles = 0;
-- 
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