sparc: Add some missing M5_FALLTHROUGHs and breaks.

These fix what I believe are some bugs, and also some gcc warnings.

Change-Id: I5fb2a1b2f0ef3643b25aaf0c29c096996ef98ec0
Reviewed-on: https://gem5-review.googlesource.com/9402
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/arch/sparc/isa.cc

@@ -480,6 +480,7 @@ ISA::setMiscRegNoEffect(int miscReg, MiscReg val)
         break;
       case MISCREG_HINTP:
         hintp = val;
+        break;
       case MISCREG_HTBA:
         htba = val;
         break;

src/arch/sparc/tlb.cc

@@ -36,6 +36,7 @@
 #include "arch/sparc/faults.hh"
 #include "arch/sparc/registers.hh"
 #include "base/bitfield.hh"
+#include "base/compiler.hh"
 #include "base/trace.hh"
 #include "cpu/base.hh"
 #include "cpu/thread_context.hh"
@@ -1155,6 +1156,7 @@ TLB::doMmuRegWrite(ThreadContext *tc, Packet *pkt)
         break;
       case ASI_ITLB_DATA_ACCESS_REG:
         entry_insert = bits(va, 8,3);
+        M5_FALLTHROUGH;
       case ASI_ITLB_DATA_IN_REG:
         assert(entry_insert != -1 || mbits(va,10,9) == va);
         ta_insert = itb->tag_access;
@@ -1169,6 +1171,7 @@ TLB::doMmuRegWrite(ThreadContext *tc, Packet *pkt)
         break;
       case ASI_DTLB_DATA_ACCESS_REG:
         entry_insert = bits(va, 8,3);
+        M5_FALLTHROUGH;
       case ASI_DTLB_DATA_IN_REG:
         assert(entry_insert != -1 || mbits(va,10,9) == va);
         ta_insert = tag_access;

src/arch/sparc/ua2005.cc

@@ -137,6 +137,7 @@ ISA::setFSReg(int miscReg, const MiscReg &val, ThreadContext *tc)
 
       case MISCREG_PSTATE:
         setMiscRegNoEffect(miscReg, val);
+        break;
 
       case MISCREG_PIL:
         setMiscRegNoEffect(miscReg, val);