ARM: Add minimal ARM_SE support for m5threads.

Updated some of the assembly code sequences to use armv7 instructions and
coprocessor 15 for storing the TLS pointer.

src/sim/syscall_emul.cc

@@ -97,6 +97,18 @@ ignoreFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 }
 
 
+SyscallReturn
+ignoreWarnOnceFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+           ThreadContext *tc)
+{
+    int index = 0;
+    warn_once("ignoring syscall %s(%d, %d, ...)", desc->name,
+         process->getSyscallArg(tc, index), process->getSyscallArg(tc, index));
+
+    return 0;
+}
+
+
 SyscallReturn
 exitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
          ThreadContext *tc)
@@ -802,6 +814,8 @@ cloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 
             for (int y = 8; y < 32; y++)
                 ctc->setIntReg(y, tc->readIntReg(y));
+        #elif THE_ISA == ARM_ISA
+            TheISA::copyRegs(tc, ctc);
         #else
             fatal("sys_clone is not implemented for this ISA\n");
         #endif

src/sim/syscall_emul.hh

@@ -187,6 +187,8 @@ SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
 /// trace flag is enabled.  Return success to the target program.
 SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
                          LiveProcess *p, ThreadContext *tc);
+SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
+                         LiveProcess *p, ThreadContext *tc);
 
 /// Target exit() handler: terminate current context.
 SyscallReturn exitFunc(SyscallDesc *desc, int num,