util/cpu: enable SPARC misalignment emulation at startup

Call a SPARC-specific helper during pre-init so the kernel emulates unaligned accesses for this process instead of terminating on alignment faults. This matches the Solaris/SPARC portability fix that motivated the original patch.

src/suricata.c

@@ -3089,6 +3089,8 @@ int InitGlobal(void)
 
 void SuricataPreInit(const char *progname)
 {
+    UtilCpuEnableSparcMisalignEmulation();
+
     SCInstanceInit(&suricata, progname);
 
     if (InitGlobal() != 0) {

src/util-cpu.c

@@ -204,3 +204,16 @@ uint64_t UtilCpuGetTicks(void)
 #endif
     return val;
 }
+
+/**
+ * \brief Handle memory access miss align on SPARC processors
+ */
+void UtilCpuEnableSparcMisalignEmulation(void)
+{
+/* 'ta 6' tells the kernel to synthesize any unaligned accesses this process
+ * makes, instead of just signalling an error and terminating the process.
+ */
+#ifdef __sparc
+    __asm("ta 6");
+#endif /* __sparc */
+}

src/util-cpu.h

@@ -33,4 +33,6 @@ void UtilCpuPrintSummary(void);
 
 uint64_t UtilCpuGetTicks(void);
 
+void UtilCpuEnableSparcMisalignEmulation(void);
+
 #endif /* SURICATA_UTIL_CPU_H */