add floating point error CSRHEADmaster

2 files changed, 8 insertions, 3 deletions

diff --git a/src/core.rs b/src/core.rs
index 2746d1b..24c6a8f 100644
--- a/src/core.rs
+++ b/src/core.rs
@@ -388,8 +388,12 @@ pub fn fdiv_s(state: &mut CpuState, rd: usize, rs1: usize, rs2: usize) {
     let b = state.f_registers[rs2];
 
     state.f_registers[rd] = if b == 0.0 {
-        f32::NAN
-        // todo: raise division by zero in csr
+        state.csr[0x001 /*fflags*/] |= 0b100;
+        if a.is_sign_positive() {
+            f32::INFINITY
+        } else {
+            f32::NEG_INFINITY
+        }
     } else {
         a / b
     }
diff --git a/src/main.rs b/src/main.rs
index 74515b1..814dfeb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -420,7 +420,8 @@ fn return_to_userspace(state: &mut CpuState) {
 }
 
 fn exit(state: &mut CpuState) {
-    let data = read_all(&state.memory, RINGBUF_ADDR as u32, RINGBUF_SIZE as u32);
+    let mut data = read_all(&state.memory, RINGBUF_ADDR as u32, RINGBUF_SIZE as u32);
+    data.retain(|&x| x != 0);
     std::fs::write("core_dump.txt", data).unwrap();
     std::process::exit(0);
 }