64bit: Fix addends > 32 bits

If a symbolic reference is offsetted by a constant > 32bit
the backends can't deal with that, so don't construct such
values.

tccgen.c

@@ -1775,8 +1775,13 @@ static void gen_opic(int op)
             /* symbol + constant case */
             if (op == '-')
                 l2 = -l2;
+	    l2 += vtop[-1].c.i;
+	    /* The backends can't always deal with addends to symbols
+	       larger than +-1<<31.  Don't construct such.  */
+	    if ((int)l2 != l2)
+	        goto general_case;
             vtop--;
-            vtop->c.i += l2;
+            vtop->c.i = l2;
         } else {
         general_case:
             if (!nocode_wanted) {

tests/tcctest.c

@@ -2429,6 +2429,19 @@ void getmyaddress(void)
 {
     printf("in getmyaddress\n");
 }
+
+#ifdef __LP64__
+long __pa_symbol(void)
+{
+    /* This 64bit constant was handled incorrectly, it was used as addend
+       (which can hold 64bit just fine) in connection with a symbol,
+       and TCC generates wrong code for that (displacements are 32bit only).
+       This effectively is "+ 0x80000000", and if addresses of globals
+       are below 2GB the result should be a number without high 32 bits set.  */
+       return ((long)(((unsigned long)(&rel1))) - (0xffffffff80000000UL));
+}
+#endif
+
 unsigned long theaddress = (unsigned long)getmyaddress;
 void relocation_test(void)
 {
@@ -2436,6 +2449,9 @@ void relocation_test(void)
     printf("*rel1=%d\n", *rel1);
     printf("*rel2=%d\n", *rel2);
     fptr();
+#ifdef __LP64__
+    printf("pa_symbol=0x%lx\n", __pa_symbol() >> 63);
+#endif
 }
 
 void old_style_f(a,b,c)

x86_64-gen.c

@@ -349,6 +349,8 @@ void load(int r, SValue *sv)
     fr = sv->r;
     ft = sv->type.t & ~VT_DEFSIGN;
     fc = sv->c.i;
+    if (fc != sv->c.i && (fr & VT_SYM))
+      tcc_error("64 bit addend in load");
 
     ft &= ~(VT_VOLATILE | VT_CONSTANT);
 
@@ -528,9 +530,11 @@ void store(int r, SValue *v)
     v = pe_getimport(v, &v2);
 #endif
 
+    fr = v->r & VT_VALMASK;
     ft = v->type.t;
     fc = v->c.i;
-    fr = v->r & VT_VALMASK;
+    if (fc != v->c.i && (fr & VT_SYM))
+      tcc_error("64 bit addend in store");
     ft &= ~(VT_VOLATILE | VT_CONSTANT);
     bt = ft & VT_BTYPE;