excp: support hardware_error_exception delegation

enable M -> S and HS -> VU/VS  delegation

riscv/csrs.cc

@@ -930,6 +930,7 @@ bool medeleg_csr_t::unlogged_write(const reg_t val) noexcept {
     | (1 << CAUSE_STORE_PAGE_FAULT)
     | (proc->extension_enabled('H') ? hypervisor_exceptions : 0)
     | (1 << CAUSE_SOFTWARE_CHECK_FAULT)
+    | (1 << CAUSE_HARDWARE_ERROR_FAULT)
     ;
   return basic_csr_t::unlogged_write((read() & ~mask) | (val & mask));
 }

riscv/processor.cc

@@ -318,7 +318,8 @@ void state_t::reset(processor_t* const proc, reg_t max_isa)
     (1 << CAUSE_FETCH_PAGE_FAULT) |
     (1 << CAUSE_LOAD_PAGE_FAULT) |
     (1 << CAUSE_STORE_PAGE_FAULT) |
-    (1 << CAUSE_SOFTWARE_CHECK_FAULT);
+    (1 << CAUSE_SOFTWARE_CHECK_FAULT) |
+    (1 << CAUSE_HARDWARE_ERROR_FAULT);
   csrmap[CSR_HEDELEG] = hedeleg = std::make_shared<masked_csr_t>(proc, CSR_HEDELEG, hedeleg_mask, 0);
   csrmap[CSR_HCOUNTEREN] = hcounteren = std::make_shared<masked_csr_t>(proc, CSR_HCOUNTEREN, counteren_mask, 0);
   htimedelta = std::make_shared<basic_csr_t>(proc, CSR_HTIMEDELTA, 0);