[Qemu-devel] [5956] linux-user: Introduce h2g_valid

[Aurelien Jarno]

Revision: 5956
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5956
Author:   aurel32
Date:     2008-12-08 18:12:18 +0000 (Mon, 08 Dec 2008)

Log Message:
-----------
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 <address@hidden>

Signed-off-by: Kirill A. Shutemov <address@hidden>
Signed-off-by: Aurelien Jarno <address@hidden>

Modified Paths:
--------------
    trunk/cpu-all.h

Modified: trunk/cpu-all.h
===================================================================
--- trunk/cpu-all.h     2008-12-08 18:12:11 UTC (rev 5955)
+++ trunk/cpu-all.h     2008-12-08 18:12:18 UTC (rev 5956)
@@ -638,6 +638,10 @@
     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)