sim: Remove the syscall gem5 op.

This is now handled by the workload "event" gem5 op.

Change-Id: Ibc195fde14a6174d1978bf280c349ca895e7fda3
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/34164
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/sim/pseudo_inst.cc

@@ -471,17 +471,6 @@ switchcpu(ThreadContext *tc)
     exitSimLoop("switchcpu");
 }
 
-/*
- * This function is executed when the simulation is executing the syscall
- * handler in System Emulation mode.
- */
-void
-m5Syscall(ThreadContext *tc)
-{
-    DPRINTF(PseudoInst, "PseudoInst::m5Syscall()\n");
-    tc->getSystemPtr()->workload->syscall(tc);
-}
-
 void
 togglesync(ThreadContext *tc)
 {

src/sim/pseudo_inst.hh

@@ -242,10 +242,6 @@ pseudoInstWork(ThreadContext *tc, uint8_t func, uint64_t &result)
         return false;
 
       /* SE mode functions */
-      case M5OP_SE_SYSCALL:
-        invokeSimcall<ABI>(tc, m5Syscall);
-        return true;
-
       case M5OP_SE_PAGE_FAULT:
         invokeSimcall<ABI>(tc, TheISA::m5PageFault);
         return true;