From 940a5ae77a1efc8f89fe5b56fe4a4ae34a0e480d Mon Sep 17 00:00:00 2001
From: David Li <li.davidm96@gmail.com>
Date: Thu, 7 Jan 2016 11:12:49 -0700
Subject: Implement print system call

---
 src/main.rs | 59 +++++++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 43 insertions(+), 16 deletions(-)

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index e91db5f..722efdb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,7 +14,10 @@ use rustv::isa;
 use rustv::memory;
 use rustv::memory::MemoryInterface;
 use rustv::memory::Mmu;
+use rustv::register_file;
 use rustv::simulator;
+use rustv::syscall;
+use rustv::trap;
 
 const USAGE: &'static str = "
 cacheracer - A F/OSS implementation of the CS 3410 CacheRacer
@@ -96,6 +99,40 @@ impl memory::MemoryInterface for MemoryTracker {
     }
 }
 
+struct SyscallHandler<'a> {
+    memory: memory::SharedMemory<'a>,
+}
+
+impl<'a> syscall::SyscallHandler for SyscallHandler<'a> {
+    fn syscall(&mut self, registers: &mut register_file::RegisterFile) -> Option<trap::Trap> {
+        println!("Syscall number {}", registers.read_word(isa::Register::X10));
+        let mut base = registers.read_word(isa::Register::X11);
+        let mut string = vec![];
+
+        loop {
+            let c = self.memory.borrow_mut().read_byte(base);
+
+            if let Ok(0x00) = c {
+                break;
+            }
+            else if let Ok(c) = c {
+                string.push(c);
+            }
+
+            base += 1;
+        }
+
+        let result = std::str::from_utf8(&string);
+        if let Ok(string) = result {
+            println!("{}", string);
+        }
+        else {
+            println!("Error printing string: {:?}", result);
+        }
+        None
+    }
+}
+
 fn load_program<T: memory::Mmu>(memory: &mut memory::Memory,
                                 mmu: &T, path: &str) -> isa::Address {
     let mut f = File::open(path).unwrap();
@@ -106,23 +143,13 @@ fn load_program<T: memory::Mmu>(memory: &mut memory::Memory,
     let elf = elfloader::ElfBinary::new("test", &buffer).unwrap();
     let start = elf.file_header().entry as isa::Address;
 
-    let mut text = None;
-    let mut data = None;
     for p in elf.section_headers() {
-        if p.name.0 == 0x1b {
-            text = Some((elf.section_data(p), p.addr));
-        }
-        else if p.name.0 == 0x33 {
-            data = Some((elf.section_data(p), p.addr));
+        let name = elf.section_name(p);
+        if name == ".text" || name == ".sdata" || name == ".rodata" {
+            memory.write_segment(mmu, elf.section_data(p), p.addr as usize);
         }
     }
 
-    let (text, text_offset) = text.unwrap();
-    let (data, data_offset) = data.unwrap();
-
-    memory.write_segment(mmu, text, text_offset as usize);
-    memory.write_segment(mmu, data, data_offset as usize);
-
     start
 }
 
@@ -156,9 +183,9 @@ fn main() {
         start2, 0x1000,
         cache_ref.clone(), Box::new(mmu2));
     let cores = vec![core, core2];
-    let mut simulator = simulator::Simulator::new(cores, memory_ref.clone());
-
-    println!("{:?}", memory_ref.borrow_mut().read_instruction((start1)));
+    let system = SyscallHandler { memory: memory_ref.clone(), };
+    let mut simulator = simulator::Simulator::new(
+        cores, memory_ref.clone(), system);
 
     simulator.run();
 
-- 
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