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authoraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2008-12-08 18:12:11 +0000
committeraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2008-12-08 18:12:11 +0000
commit0e62fd795726640dfe89538a45a8bd18d149fa50 (patch)
tree603405110e2886b4a64c8e3fecfc884d893e9254 /cpu-all.h
parent1609cd444b7d3a759cd09342140464576d0e96e2 (diff)
linux-user: Safety belt for h2g
h2g can only work on 64-bit hosts if the provided address is mappable to the guest range. Neglecting this was already the source for several bugs. Instrument the macro so that it will trigger earlier in the future (at least as long as we have this kind of mapping mechanism). Based on a patch from Jan Kiszka <jan.kiszka@web.de> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name> Acked-by: Edgar E. Iglesias <edgar.iglesias@gmail.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5955 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'cpu-all.h')
-rw-r--r--cpu-all.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/cpu-all.h b/cpu-all.h
index bd65061b4a..69b1f725c8 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -621,6 +621,9 @@ static inline void stfq_be_p(void *ptr, float64 v)
/* MMU memory access macros */
#if defined(CONFIG_USER_ONLY)
+#include <assert.h>
+#include "qemu-types.h"
+
/* On some host systems the guest address space is reserved on the host.
* This allows the guest address space to be offset to a convenient location.
*/
@@ -629,7 +632,12 @@ static inline void stfq_be_p(void *ptr, float64 v)
/* All direct uses of g2h and h2g need to go away for usermode softmmu. */
#define g2h(x) ((void *)((unsigned long)(x) + GUEST_BASE))
-#define h2g(x) ((target_ulong)((unsigned long)(x) - GUEST_BASE))
+#define h2g(x) ({ \
+ unsigned long __ret = (unsigned long)(x) - GUEST_BASE; \
+ /* Check if given address fits target address space */ \
+ assert(__ret == (abi_ulong)__ret); \
+ (abi_ulong)__ret; \
+})
#define saddr(x) g2h(x)
#define laddr(x) g2h(x)