path: root/include
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authorArturo Borrero Gonzalez <>2014-04-12 10:40:08 +0200
committerPatrick McHardy <>2014-04-12 10:40:08 +0200
commit5259feeb7cda089523a2196248baa5395bce4b50 (patch)
tree852618a136d08c5ea37f1183aee5861d37af221e /include
parent062cea3bbeabd616acc8c44eab6fd1165320cfd1 (diff)
expression: fix constant expression allocation on big endian
When allocating a constant expression, a pointer to the data is passed to the allocation function. When the variable used to store the data is larger than the size of the data type, this fails on big endian since the most significant bytes (being zero) come first. Add a helper function to calculate the proper address for the cases where this is needed. This currently affects symbolic tables for values < u64 and payload dependency generation for protocol values < u32. Signed-off-by: Patrick McHardy <>
Diffstat (limited to 'include')
1 files changed, 14 insertions, 0 deletions
diff --git a/include/utils.h b/include/utils.h
index 88ee0c9c..cc5948c1 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -1,6 +1,7 @@
+#include <asm/byteorder.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdarg.h>
@@ -46,6 +47,19 @@
typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (void *)__mptr - offsetof(type,member) );})
+ * Return a pointer to a constant variable of a size smaller than the variable.
+ */
+#define constant_data_ptr(val, len) \
+ ((void *)&(val))
+#elif defined(__BIG_ENDIAN_BITFIELD)
+#define constant_data_ptr(val, len) \
+ ((void *)&(val) + sizeof(val) - (len) / BITS_PER_BYTE)
+#error "byteorder undefined"
#define field_sizeof(t, f) (sizeof(((t *)NULL)->f))
#define array_size(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
#define div_round_up(n, d) (((n) + (d) - 1) / (d))