From 0b5de90fb1f3418470204b1e25139e1325ec28da Mon Sep 17 00:00:00 2001
From: Eyck Jentzsch <eyck@minres.com>
Date: Sun, 11 Jun 2023 18:29:48 +0200
Subject: [PATCH] changes [m|u]cause rd/wr handling

---
 src/iss/arch/riscv_hart_m_p.h  | 5 ++---
 src/iss/arch/riscv_hart_mu_p.h | 4 ++--
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/src/iss/arch/riscv_hart_m_p.h b/src/iss/arch/riscv_hart_m_p.h
index 1111146..beb0cc2 100644
--- a/src/iss/arch/riscv_hart_m_p.h
+++ b/src/iss/arch/riscv_hart_m_p.h
@@ -419,7 +419,7 @@ protected:
     std::vector<std::function<mem_write_f>> memfn_write;
     void insert_mem_range(uint64_t, uint64_t, std::function<mem_read_f>, std::function<mem_write_f>);
     feature_config cfg;
-    unsigned mcause_max_irq{(FEAT&features_e::FEAT_CLIC)?4096:16};
+    uint64_t mcause_max_irq{(FEAT&features_e::FEAT_CLIC)?4096:16};
     inline bool debug_mode_active() {return this->reg.PRIV&0x4;}
     std::pair<std::function<mem_read_f>, std::function<mem_write_f>>
     replace_mem_access(std::function<mem_read_f> rd, std::function<mem_write_f> wr){
@@ -966,12 +966,11 @@ template <typename BASE, features_e FEAT> iss::status riscv_hart_m_p<BASE, FEAT>
         val |= state.mstatus.MPIE<<27;
         val |= state.mstatus.MPP<<28;
     } else
-        val = csr[addr] & ((1UL<<(traits<BASE>::XLEN-1)) | (mcause_max_irq-1));
+        val = csr[addr]; // & ((1UL<<(traits<BASE>::XLEN-1)) | (mcause_max_irq-1));
     return iss::Ok;
 }
 
 template <typename BASE, features_e FEAT> iss::status riscv_hart_m_p<BASE, FEAT>::write_cause(unsigned addr, reg_t val) {
-    csr[addr] = val & ((1UL<<(traits<BASE>::XLEN-1)) | (mcause_max_irq-1));
     if((FEAT & features_e::FEAT_CLIC) && (csr[mtvec]&0x3)==3) {
         auto mask = ((1UL<<(traits<BASE>::XLEN-1)) | (mcause_max_irq-1) | (0xfUL<<16));
         csr[addr] = (val & mask) | (csr[addr] & ~mask);
diff --git a/src/iss/arch/riscv_hart_mu_p.h b/src/iss/arch/riscv_hart_mu_p.h
index 513ca20..0dc0de7 100644
--- a/src/iss/arch/riscv_hart_mu_p.h
+++ b/src/iss/arch/riscv_hart_mu_p.h
@@ -446,7 +446,7 @@ protected:
     std::vector<std::function<mem_write_f>> memfn_write;
     void insert_mem_range(uint64_t, uint64_t, std::function<mem_read_f>, std::function<mem_write_f>);
     feature_config cfg;
-    unsigned mcause_max_irq{(FEAT&features_e::FEAT_CLIC)?4096:16};
+    uint64_t mcause_max_irq{(FEAT&features_e::FEAT_CLIC)?4096:16};
     inline bool debug_mode_active() {return this->reg.PRIV&0x4;}
 
     std::pair<std::function<mem_read_f>, std::function<mem_write_f>>
@@ -1148,7 +1148,7 @@ template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT
             break;
         }
     } else
-        val = csr[addr] & ((1UL<<(traits<BASE>::XLEN-1)) | (mcause_max_irq-1));
+        val = csr[addr];// & ((1UL<<(traits<BASE>::XLEN-1)) | (mcause_max_irq-1));
     return iss::Ok;
 }