From: Andrew Waterman <waterman@cs.berkeley.edu>
Date: Sat, 4 Apr 2015 22:17:13 +0000 (-0700)
Subject: Check for F extension when accessing FCSR
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5a3324644dfd0ab1da6f3d3dd306f31dd902a55a;p=riscv-isa-sim.git

Check for F extension when accessing FCSR
---

diff --git a/riscv/processor.cc b/riscv/processor.cc
index 1187265..1fe0a9c 100644
--- a/riscv/processor.cc
+++ b/riscv/processor.cc
@@ -460,12 +460,18 @@ reg_t processor_t::get_csr(int which)
   {
     case CSR_FFLAGS:
       require_fp;
+      if (!supports_extension('F'))
+        break;
       return state.fflags;
     case CSR_FRM:
       require_fp;
+      if (!supports_extension('F'))
+        break;
       return state.frm;
     case CSR_FCSR:
       require_fp;
+      if (!supports_extension('F'))
+        break;
       return (state.fflags << FSR_AEXC_SHIFT) | (state.frm << FSR_RD_SHIFT);
     case CSR_CYCLE:
     case CSR_TIME: