linux-user: Introduce h2g_valid

Introduce h2g_valid to check if a given host address can be converted
into a valid guest address.

Based on a patch from  Jan Kiszka <jan.kiszka@web.de>

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5956 c046a42c-6fe2-441c-8c8c-71466251a162

diff --git a/cpu-all.h b/cpu-all.h
index 69b1f72..fadf89c 100644 (file)
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -638,6 +638,10 @@ static inline void stfq_be_p(void *ptr, float64 v)
     assert(__ret == (abi_ulong)__ret); \
     (abi_ulong)__ret; \
 })
+#define h2g_valid(x) ({ \
+    unsigned long __guest = (unsigned long)(x) - GUEST_BASE; \
+    (__guest == (abi_ulong)__guest); \
+})
 
 #define saddr(x) g2h(x)
 #define laddr(x) g2h(x)