sw check exception support was recently added. This patch further augments
sw check exception by providing support for additional code which is
provided in *tval. Adds `sw_check_code` field in cpuarchstate. Whenever
sw check exception is raised *tval gets the value deposited in
`sw_check_code`.

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/cpu.h        | 2 ++
 target/riscv/cpu_helper.c | 3 +++
 target/riscv/csr.c        | 1 +
 3 files changed, 6 insertions(+)

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index a7c970e70c..a0f14c759e 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -224,6 +224,8 @@ struct CPUArchState {
 
     /* elp state for zicfilp extension */
     bool      elp;
+    /* sw check code for sw check exception */
+    target_ulong sw_check_code;
 #ifdef CONFIG_USER_ONLY
     uint32_t elf_flags;
 #endif
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 5f38969aa6..fffd865cb4 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -1760,6 +1760,9 @@ void riscv_cpu_do_interrupt(CPUState *cs)
                 cs->watchpoint_hit = NULL;
             }
             break;
+        case RISCV_EXCP_SW_CHECK:
+            tval = env->sw_check_code;
+            break;
         default:
             break;
         }
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 5771a14848..a5a969a377 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -1179,6 +1179,7 @@ static const uint64_t all_ints = M_MODE_INTERRUPTS | S_MODE_INTERRUPTS |
                          (1ULL << (RISCV_EXCP_INST_PAGE_FAULT)) | \
                          (1ULL << (RISCV_EXCP_LOAD_PAGE_FAULT)) | \
                          (1ULL << (RISCV_EXCP_STORE_PAGE_FAULT)) | \
+                         (1ULL << (RISCV_EXCP_SW_CHECK)) | \
                          (1ULL << (RISCV_EXCP_INST_GUEST_PAGE_FAULT)) | \
                          (1ULL << (RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT)) | \
                          (1ULL << (RISCV_EXCP_VIRT_INSTRUCTION_FAULT)) | \
-- 
2.44.0