Dump machine registers in OpenSBI

JOURNAL.md

@@ -3531,3 +3531,59 @@ address:
 
 Let's revert the stvec to its original value and try again and see if we can see
 the delegation properly being handed to the supervisor handler.
+
+It continues to do the same trap in machine mode, rather than handing the
+interrupt over to supervisor.
+
+    Boot HART MIDELEG         : 0x0000000000000222
+    Boot HART MEDELEG         : 0x000000000000b109
+    ><E
+    ><E<><Ed><Ee><Eb><Eu><Eg><E_><Eu><Ea><Er><Et><E>><E
+    ><E><E>Core:  11 devices, 8 uclasses, devicetree: board
+    Loading Environment from nowhere... OK
+    In:    serial,usbkbd
+    Out:   serial,vidconsole
+    Err:   serial,vidconsole
+    No working controllers found
+    Net:   No ethernet found.
+    Working FDT set to c0000000
+    Hit any key to stop autoboot:  0
+    => exception sregs
+    stvec   : 0x00000000af6f4400
+    sie     : 0x0000000000000000
+    sip     : 0x0000000000000000
+    sstatus : 0x8000000200006000
+    => exception enable
+    => exception sregs
+    stvec   : 0x00000000af6f4400 <-------- now stvec is left as-is
+    sie     : 0x0000000000000222
+    sip     : 0x0000000000000000
+    sstatus : 0x8000000200006002
+    => mw 0x40014000 0xffffffff # Disable clock interrupt
+    => md 0x40801000 1 # Show pending interrupts (should be 0x10)
+    40801000: 00000010                             ....
+    => mw 0x40802000 0x10 # Enable interrupt for source 4 (timer)
+    => mw 0x40800010 0xff # Make source 4 priority large
+    <i
+    sbi_trap_error: hart0: trap0: unhandled local interrupt (error -1000)
+
+    sbi_trap_error: hart0: trap0: mcause=0x800000000000000b mtval=0x0000000000000000
+    sbi_trap_error: hart0: trap0: mepc=0x00000000af71df40 mstatus=0x8000000a00006802
+    sbi_trap_error: hart0: trap0: ra=0x00000000af71df24 sp=0x00000000aeed2b00
+    sbi_trap_error: hart0: trap0: gp=0x00000000aeed2dd0 tp=0x0000000000000000
+    sbi_trap_error: hart0: trap0: s0=0x00000000af7cca38 s1=0x0000000000000000
+    sbi_trap_error: hart0: trap0: a0=0x0000000000000000 a1=0x0000000000000002
+    sbi_trap_error: hart0: trap0: a2=0x0000000000000008 a3=0x0000000000000004
+    sbi_trap_error: hart0: trap0: a4=0x0000000000000001 a5=0x0000000000000001
+    sbi_trap_error: hart0: trap0: a6=0x0000000000000008 a7=0x00000000af794b08
+    sbi_trap_error: hart0: trap0: s2=0x0000000000000000 s3=0x00000000aeed4b90
+    sbi_trap_error: hart0: trap0: s4=0x0000000000000003 s5=0x00000000af7f7754
+    sbi_trap_error: hart0: trap0: s6=0x0000000000000000 s7=0x0000000000000000
+    sbi_trap_error: hart0: trap0: s8=0x0000000000000000 s9=0x0000000000000000
+    sbi_trap_error: hart0: trap0: s10=0x00000000aeed4bc0 s11=0x0000000000000000
+    sbi_trap_error: hart0: trap0: t0=0x00000000aeed2ac0 t1=0x0000000000000039
+    sbi_trap_error: hart0: trap0: t2=0x3b3d74696e695f64 t3=0x0000000000000010
+    sbi_trap_error: hart0: trap0: t4=0x0000000000000000 t5=0x61745f746f6f627b
+    sbi_trap_error: hart0: trap0: t6=0x00000000aeed2aa0
+
+Let's dump the machine registers too.

lagarto-ox.nix

@@ -333,6 +333,7 @@
       patches = [
         ./opensbi-timer-debug.patch
         ./opensbi-enable-meip.patch
+        ./opensbi-dump-mregs.patch
         #./opensbi-dont-delegate.patch
         #./ox-alveo-platform-plic.patch
       ];

opensbi-dump-mregs.patch

@@ -0,0 +1,19 @@
+diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
+index c366701..1ef6145 100644
+--- a/lib/sbi/sbi_hart.c
++++ b/lib/sbi/sbi_hart.c
+@@ -241,6 +241,14 @@ void sbi_hart_delegation_dump(struct sbi_scratch *scratch,
+ 		   prefix, suffix, csr_read(CSR_MIDELEG));
+ 	sbi_printf("%sMEDELEG%s: 0x%" PRILX "\n",
+ 		   prefix, suffix, csr_read(CSR_MEDELEG));
++	sbi_printf("%sMTVEC%s  : 0x%" PRILX "\n",
++		   prefix, suffix, csr_read(CSR_MTVEC));
++	sbi_printf("%sMIE%s    : 0x%" PRILX "\n",
++		   prefix, suffix, csr_read(CSR_MIE));
++	sbi_printf("%sMIP%s    : 0x%" PRILX "\n",
++		   prefix, suffix, csr_read(CSR_MIP));
++	sbi_printf("%sMSTATUS%s: 0x%" PRILX "\n",
++		   prefix, suffix, csr_read(CSR_MSTATUS));
+ }
+ 
+ unsigned int sbi_hart_mhpm_mask(struct sbi_scratch *scratch)