moves to-/fromhost declaration into platform

env/iss/link.lds

@@ -178,7 +178,7 @@ SECTIONS
     PROVIDE( _sp = . );
   } >ram AT>ram :ram
 
-  PROVIDE( tohost = 0xfffffff0 );
+  PROVIDE( tohost = . );
-  PROVIDE( fromhost = 0xfffffff8 );
+  PROVIDE( fromhost = . + 8 );
 }
 

env/iss/platform.h

@@ -22,6 +22,9 @@
 
 #include <stdint.h>
 
+extern volatile uintptr_t tohost;
+extern volatile uintptr_t fromhost;
+
 void init_pll(void);
 unsigned long get_cpu_freq(void);
 unsigned long get_timer_freq(void);

libwrap/sys/_exit.c

@@ -3,6 +3,7 @@
 #include "weak_under_alias.h"
 //#include <stdint.h>
 #include <unistd.h>
+#include <stdint.h>
 #if defined(SEMIHOSTING)
 #include "semihosting.h"
 #endif