#define MDATA_CONCAT_(a,b) a##b
#define MDATA_CONCAT(a,b) MDATA_CONCAT_(a,b)
#define BE32(x) 0,0,0,0
#define BE16(x) 0,0

.header = {
	0,0,0,0,
	BE32(offsetof(struct M_NAME, data)),
	BE16(M_BASE & M_MASK),
	BE16(sizeof(MDATA_CONCAT(M_NAME,_offsets))/2-1),
},
.offsets = {
#define M(n, s) \
	[2*((n)-M_BASE)] = \
	(offsetof(struct MDATA_CONCAT(M_NAME,_data), m_##n)+1)/256,\
	(offsetof(struct MDATA_CONCAT(M_NAME,_data), m_##n)+1)%256,
#include M_SOURCE
#undef M
},
.data = {
#define M(n, s) .m_##n = s,
#include M_SOURCE
#undef M
},

#undef MDATA_CONCAT
#undef MDATA_CONCAT_