target-hppa: Implement basic arithmetic

Signed-off-by: NRichard Henderson <rth@twiddle.net>

target/hppa/helper.h

 DEF_HELPER_2(excp, noreturn, env, int)
+DEF_HELPER_FLAGS_2(tsv, TCG_CALL_NO_WG, void, env, tl)
+DEF_HELPER_FLAGS_2(tcond, TCG_CALL_NO_WG, void, env, tl)
 
 DEF_HELPER_FLAGS_1(loaded_fr0, TCG_CALL_NO_RWG, void, env)

target/hppa/op_helper.c

@@ -31,6 +31,29 @@ void QEMU_NORETURN HELPER(excp)(CPUHPPAState *env, int excp)
     cpu_loop_exit(cs);
 }
 
+static void QEMU_NORETURN dynexcp(CPUHPPAState *env, int excp, uintptr_t ra)
+{
+    HPPACPU *cpu = hppa_env_get_cpu(env);
+    CPUState *cs = CPU(cpu);
+
+    cs->exception_index = excp;
+    cpu_loop_exit_restore(cs, ra);
+}
+
+void HELPER(tsv)(CPUHPPAState *env, target_ulong cond)
+{
+    if (unlikely((target_long)cond < 0)) {
+        dynexcp(env, EXCP_SIGFPE, GETPC());
+    }
+}
+
+void HELPER(tcond)(CPUHPPAState *env, target_ulong cond)
+{
+    if (unlikely(cond)) {
+        dynexcp(env, EXCP_SIGFPE, GETPC());
+    }
+}
+
 void HELPER(loaded_fr0)(CPUHPPAState *env)
 {
     uint32_t shadow = env->fr[0] >> 32;