To be used by userspace emulation to verify that the memory
range defined by [start, start+len) is valid for the guest,
taking into account TARGET_VIRT_ADDR_SPACE_BITS.
Signed-off-by: Richard Henderson <r...@twiddle.net>
---
cpu-all.h | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/cpu-all.h b/cpu-all.h
index 927445c..7d31b16 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -637,11 +637,21 @@ extern int have_guest_base;
#if HOST_LONG_BITS <= TARGET_VIRT_ADDR_SPACE_BITS
#define h2g_valid(x) 1
+#define guest_start_len_valid(s,l) ({ \
+ unsigned long __s = (unsigned long)(s); \
+ unsigned long __e = __s + (l) - 1; \
+ __e >= __s; \
+})
#else
#define h2g_valid(x) ({ \
unsigned long __guest = (unsigned long)(x) - GUEST_BASE; \
__guest < (1ul << TARGET_VIRT_ADDR_SPACE_BITS); \
})
+#define guest_start_len_valid(s,l) ({ \
+ unsigned long __s = (unsigned long)(s); \
+ unsigned long __e = __s + (l) - 1; \
+ __e >= __s && __e < (1ul << TARGET_VIRT_ADDR_SPACE_BITS); \
+})
#endif
#define h2g(x) ({ \
--
1.6.6.1
