From fb1b5a48ad81e5218bd38f2d55ed8aeb9d94237d Mon Sep 17 00:00:00 2001
From: Dmitry Selyutin <ghostmansd@gmail.com>
Date: Fri, 22 Sep 2023 22:08:10 +0300
Subject: [PATCH] isa/caller: provide sc and scv instructions wrapper

---
 src/openpower/decoder/isa/caller.py | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/openpower/decoder/isa/caller.py b/src/openpower/decoder/isa/caller.py
index 0e3296ba..1099bbb7 100644
--- a/src/openpower/decoder/isa/caller.py
+++ b/src/openpower/decoder/isa/caller.py
@@ -18,6 +18,8 @@ from copy import deepcopy
 from functools import wraps
 
 from nmigen.sim import Settle
+from os import uname
+import openpower.syscalls
 from openpower.consts import (MSRb, PIb,  # big-endian (PowerISA versions)
                               SVP64CROffs, SVP64MODEb)
 from openpower.decoder.helpers import (ISACallerHelper, ISAFPHelpers, exts,
@@ -1131,6 +1133,22 @@ class StepLoop:
         log("    new dststep", dststep)
 
 
+class SyscallEmulator(openpower.syscalls.Dispatcher):
+    def __init__(self, isacaller):
+        machine = uname().machine
+        host = {
+            "x86_64": "amd64",
+        }.get(machine, machine)
+
+        self.__isacaller = isacaller
+
+        return super().__init__(guest="ppc64", host=host)
+
+    def __call__(self, identifier, *arguments):
+        (identifier, *arguments) = map(int, (identifier, *arguments))
+        return super().__call__(identifier, *arguments)
+
+
 class ISACaller(ISACallerHelper, ISAFPHelpers, StepLoop):
     # decoder2 - an instance of power_decoder2
     # regfile - a list of initial values for the registers
@@ -1152,6 +1170,7 @@ class ISACaller(ISACallerHelper, ISAFPHelpers, StepLoop):
                  use_mmap_mem=False):
 
         # trace log file for model output. if None do nothing
+        self.syscall = SyscallEmulator(isacaller=self)
         self.insnlog = insnlog
         self.insnlog_is_file = hasattr(insnlog, "write")
         if not self.insnlog_is_file and self.insnlog:
@@ -1931,6 +1950,14 @@ class ISACaller(ISACallerHelper, ISAFPHelpers, StepLoop):
         log("call", ins_name, asmop,
             kind=LogKind.InstrInOuts)
 
+        if not self.is_svp64_mode and asmop in ("sc", "scv"):
+            identifier = self.gpr(0)
+            arguments = map(self.gpr, range(3, 9))
+            result = self.syscall(identifier, *arguments)
+            self.gpr.write(3, result, False, self.namespace["XLEN"])
+            self.update_pc_next()
+            return
+
         # sv.setvl is *not* a loop-function. sigh
         log("is_svp64_mode", self.is_svp64_mode, asmop)
 
-- 
2.30.2