Check for F extension when accessing FCSR

11 years ago · 5a3324644d
1 changed files with 6 additions and 0 deletions
--- 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: