raise_exception2: cause=2, tval=0x10401073

README.md

@@ -10,6 +10,39 @@
 
 See https://github.com/lupyuen/nuttx-tinyemu
 
+# TODO
+
+```text
+TinyEMU Emulator for Ox64 BL808 RISC-V SBC
+virtio_console_init
+csr_write: csr=0x341 val=0x0000000050200000
+raise_exception2: cause=2, tval=0x10401073
+pc =0000000050200074 ra =0000000000000000 sp =0000000050407c00 gp =0000000000000000
+tp =0000000000000000 t0 =0000000050200000 t1 =0000000000000000 t2 =0000000000000000
+s0 =0000000000000000 s1 =0000000000000000 a0 =0000000000000000 a1 =0000000000001040
+a2 =0000000000000000 a3 =0000000000000000 a4 =0000000000000000 a5 =0000000000000000
+a6 =0000000000000000 a7 =0000000000000000 s2 =0000000000000000 s3 =0000000000000000
+s4 =fffffffffffffff3 s5 =0000000000000000 s6 =0000000000000000 s7 =0000000000000000
+s8 =0000000000000000 s9 =0000000000000000 s10=0000000000000000 s11=0000000000000000
+t3 =0000000000000000 t4 =0000000000000000 t5 =0000000000000000 t6 =0000000000000000
+priv=U mstatus=0000000a00000080 cycles=13
+ mideleg=0000000000000000 mie=0000000000000000 mip=0000000000000080
+raise_exception2: cause=2, tval=0x0
+pc =0000000000000000 ra =0000000000000000 sp =0000000050407c00 gp = 
+```
+
+Source:
+
+```text
+/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl808_head.S:124
+2:
+  /* Disable all interrupts (i.e. timer, external) in sie */
+  csrw	sie, zero
+    50200074:	10401073          	csrw	sie,zero
+```
+
+Why is `csrw sie,zero` invalid? Are we in Supervisor Mode?
+
 # TinyEMU
 
 [![Build](https://github.com/lupyuen/TinyEMU/workflows/Build/badge.svg)][GitHub Actions]

riscv_cpu.c

@@ -1087,7 +1087,8 @@ static void raise_exception2(RISCVCPUState *s, uint32_t cause,
 #ifdef DUMP_EXCEPTIONS
         flag = 1;
         flag = (cause & CAUSE_INTERRUPT) == 0;
-        if (cause == CAUSE_SUPERVISOR_ECALL || cause == CAUSE_ILLEGAL_INSTRUCTION)
+        //// Previously: if (cause == CAUSE_SUPERVISOR_ECALL || cause == CAUSE_ILLEGAL_INSTRUCTION)
+        if (cause == CAUSE_SUPERVISOR_ECALL) ////
             flag = 0;
 #endif
         if (flag) {