From c2abd82b7dad7dd4a69018f098c54316c2b4a5a1 Mon Sep 17 00:00:00 2001
From: SharzyL <me@sharzy.in>
Date: Sun, 14 Apr 2024 18:59:51 +0800
Subject: [PATCH] [cosim] feat: write mcycle on spike_step

---
 ipemu/csrc/vbridge_impl.cc | 1 +
 tests/asm/smoke/smoke.asm  | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/ipemu/csrc/vbridge_impl.cc b/ipemu/csrc/vbridge_impl.cc
index 2c16f377f..b949fbc12 100644
--- a/ipemu/csrc/vbridge_impl.cc
+++ b/ipemu/csrc/vbridge_impl.cc
@@ -361,6 +361,7 @@ void VBridgeImpl::getCoverage() { return ctx->coveragep()->write(); }
 
 std::optional<SpikeEvent> VBridgeImpl::spike_step() {
   auto state = proc.get_state();
+  state->csrmap.at(CSR_MCYCLE)->write(get_t());
   auto fetch = proc.get_mmu()->load_insn(state->pc);
   auto event = create_spike_event(fetch);
 
diff --git a/tests/asm/smoke/smoke.asm b/tests/asm/smoke/smoke.asm
index 7c458acf7..57e517f83 100644
--- a/tests/asm/smoke/smoke.asm
+++ b/tests/asm/smoke/smoke.asm
@@ -27,6 +27,9 @@ loop:
     addi a2, a2, -1
     bnez a2, add_test
 
+    # read cycles
+    csrr t0, mcycle
+
     ret
 
 will_not_be_executed: