mac2defs

unix v7是最后一个广泛发布的研究型UNIX版本

/*	PDP11 Registers */

	/* scratch registers */
# define R0 0
# define R1 1

	/* register variables */
# define R2 2
# define R3 3
# define R4 4

	/* special purpose */
# define R5 5	/* frame pointer */
# define SP 6	/* stack pointer */
# define PC 7	/* program counter */

	/* floating registers */

# define FR0 8
# define FR1 9
# define FR2 10
# define FR3 11
# define FR4 12
# define FR5 13

# define SAVEREGION 8 /* number of bytes for save area */

# define BYTEOFF(x) ((x)&01)
# define wdal(k) (BYTEOFF(k)==0)
# define BITOOR(x) ((x)>>3)  /* bit offset to oreg offset */

# define REGSZ 14

# define TMPREG R5


# define STOARG(p)     /* just evaluate the arguments, and be done with it... */
# define STOFARG(p)
# define STOSTARG(p)
# define genfcall(a,b) gencall(a,b)


	/* shape for constants between -128 and 127 */
# define SCCON (SPECIAL+100)
	/* shape for constants between 0 and 32767 */
# define SICON (SPECIAL+101)

# define MYREADER(p) myreader(p)
extern int fltused;
	/* calls can be nested on the PDP-11 */
# define NESTCALLS