#define UNIX64_RET_VOID		0
#define UNIX64_RET_UINT8	1
#define UNIX64_RET_UINT16	2
#define UNIX64_RET_UINT32	3
#define UNIX64_RET_SINT8	4
#define UNIX64_RET_SINT16	5
#define UNIX64_RET_SINT32	6
#define UNIX64_RET_INT64	7
#define UNIX64_RET_XMM32	8
#define UNIX64_RET_XMM64	9
#define UNIX64_RET_X87		10
#define UNIX64_RET_X87_2	11
#define UNIX64_RET_ST_XMM0_RAX	12
#define UNIX64_RET_ST_RAX_XMM0	13
#define UNIX64_RET_ST_XMM0_XMM1	14
#define UNIX64_RET_ST_RAX_RDX	15

#define UNIX64_RET_LAST		15

#define UNIX64_FLAG_RET_IN_MEM	(1 << 10)
#define UNIX64_FLAG_XMM_ARGS	(1 << 11)
#define UNIX64_SIZE_SHIFT	12