From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 18 Oct 2023 21:03:38 +0000 (+0100)
Subject: annoying - call the TRAP() function in system.mdwn "sc" instruction.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c91aa3eedd5e6652cc4f4f3c86b8621ce711287e;p=openpower-isa.git

annoying - call the TRAP() function in system.mdwn "sc" instruction.
setting NIA and MSR is tricky, it involves reading some english text
that is very unclear (Book III section 4.3.1 which then in turn says
"go to section 7.5 page 1076").
given that we are not implementing hypervisor or LEV=1/2/3 it is just
simpler to call TRAP(0xc00)
---

diff --git a/openpower/isa/system.mdwn b/openpower/isa/system.mdwn
index 74f06c50..958502d3 100644
--- a/openpower/isa/system.mdwn
+++ b/openpower/isa/system.mdwn
@@ -18,8 +18,7 @@ Pseudo-code:
     SRR1[0:32]  <- MSR[0:32]
     SRR1[37:41] <- MSR[37:41]
     SRR1[48:63] <- MSR[48:63]
-    MSR <- new_value
-    NIA <- 0x0000_0000_0000_0C00
+    TRAP(0xC00)
 
 Special Registers Altered:
 
diff --git a/src/openpower/decoder/isa/caller.py b/src/openpower/decoder/isa/caller.py
index ce5a80ac..0e3296ba 100644
--- a/src/openpower/decoder/isa/caller.py
+++ b/src/openpower/decoder/isa/caller.py
@@ -1322,6 +1322,8 @@ class ISACaller(ISACallerHelper, ISAFPHelpers, StepLoop):
         hence the default arguments.  when calling from inside ISACaller
         it is best to use call_trap()
         """
+        if isinstance(trap_addr, SelectableInt):
+            trap_addr = trap_addr.value
         # https://bugs.libre-soc.org/show_bug.cgi?id=859
         kaivb = self.spr['KAIVB'].value
         msr = self.namespace['MSR'].value