5.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

/*
 * arm definition
 */
#include <u.h>
#include <bio.h>
#include "/arm/include/ureg.h"
#include <mach.h>


#define	REGOFF(x)	(ulong) (&((struct Ureg *) 0)->x)

#define SP		REGOFF(r13)
#define PC		REGOFF(pc)

#define	REGSIZE		sizeof(struct Ureg)

Reglist armreglist[] =
{
	{"TYPE",	REGOFF(type),		RINT|RRDONLY, 'X'},
	{"PSR",		REGOFF(psr),		RINT|RRDONLY, 'X'},
	{"PC",		PC,			RINT, 'X'},
	{"SP",		SP,			RINT, 'X'},
	{"R15",		PC,			RINT, 'X'},
	{"R14",		REGOFF(r14),		RINT, 'X'},
	{"R13",		REGOFF(r13),		RINT, 'X'},
	{"R12",		REGOFF(r12),		RINT, 'X'},
	{"R11",		REGOFF(r11),		RINT, 'X'},
	{"R10",		REGOFF(r10),		RINT, 'X'},
	{"R9",		REGOFF(r9),		RINT, 'X'},
	{"R8",		REGOFF(r8),		RINT, 'X'},
	{"R7",		REGOFF(r7),		RINT, 'X'},
	{"R6",		REGOFF(r6),		RINT, 'X'},
	{"R5",		REGOFF(r5),		RINT, 'X'},
	{"R4",		REGOFF(r4),		RINT, 'X'},
	{"R3",		REGOFF(r3),		RINT, 'X'},
	{"R2",		REGOFF(r2),		RINT, 'X'},
	{"R1",		REGOFF(r1),		RINT, 'X'},
	{"R0",		REGOFF(r0),		RINT, 'X'},
	{  0 }
};

	/* the machine description */
Mach marm =
{
	"arm",
	MARM,		/* machine type */
	armreglist,	/* register set */
	REGSIZE,	/* register set size */
	0,		/* fp register set size */
	"PC",		/* name of PC */
	"SP",		/* name of SP */
	"R14",		/* name of link register */
	"setR12",	/* static base register name */
	0,		/* static base register value */
	0x1000,		/* page size */
	0xC0000000ULL,	/* kernel base */
	0xC0000000ULL,	/* kernel text mask */
	0x7FFFFFFFULL,	/* user stack top */
	4,		/* quantization of pc */
	4,		/* szaddr */
	4,		/* szreg */
	4,		/* szfloat */
	8,		/* szdouble */
};