xref: /csrg-svn/sys/tahoe/align/align.h (revision 45699)

/*	align.h	1.2	90/12/04	*/

#ifndef	LOCORE
/*
 * Some special registers definitions.
 */

#ifndef	SLR
#define	SLR	1
#define	P0LR	3
#define	P1LR	5
#define	P2LR	7
#endif

#include	"defs.h"
/*
 * Definitions about the stack frame as seen by the routine
 * 'alignment' in the kernel. If you ever wondered what's the
 * meaning of 'machine dependent code', look here :-)
 * This structure is partly set up by locore.s, for 'alignment',
 * and partly by the allocation of local variables in 'alignment.c'
 * itself.
 *    All these things are passed between procedures on the
 * (current process' kernel) stack. The alternative (static
 * variables) is a little bit more elegant but it works fine
 * for one process only. Will not work for multiple processes
 * with alignment processing or for MP models of HW.
 *
 * WARNING : due to the intimate relationships involved, don't
 *	change the process_info structure unless you also
 *	change the alignment trap code in locore.s AND the
 *	allocation of local variables in 'alignment.c' !!
 */
typedef	struct {
	long		Saved_sp;		/* For exceptions */
	long		Saved_pc;
	long		Last_operand;		/* Last operand # processed */
	long		Opcode;			/* 'offending' opcode */
	struct	oprnd	Decoded[4];
	long		REG0;
	long		REG1;
	long		REG2;
	long		REG3;
	long		REG4;
	long		REG5;
	long		REG6;
	long		REG7;
	long		REG8;
	long		REG9;
	long		REG10;
	long		REG11;
	long		REG12;
	long		return_pc;	/* Points into locore.s */
	long		mask_restored;
	long		REG13;		/* Original, from the process */
	long		Sp;		/* Alias R14 */
	long		ret_code;
	long		ret_addr;
	long		ret_exception;	/* To tell locore.s about problems */
	long		Ach;
	long		Acl;
	unsigned	unused:30;
	unsigned	pcb_acc_pnt:1;
	unsigned	acc_dbl:1;
	long		Pc;		/* Alias R15 */
	long		Psl;
} process_info;

#define	saved_pc	(infop->Saved_pc)
#define	saved_sp	(infop->Saved_sp)
#define last_operand	(infop->Last_operand)
#define	opCODE		(infop->Opcode)
#define	decoded		(infop->Decoded)
#define	r0		(infop->REG0)
#define	r1		(infop->REG1)
#define	r2		(infop->REG2)
#define	r3		(infop->REG3)
#define	r4		(infop->REG4)
#define	r5		(infop->REG5)
#define	r6		(infop->REG6)
#define	r7		(infop->REG7)
#define	r8		(infop->REG8)
#define	r9		(infop->REG9)
#define	r10		(infop->REG10)
#define	r11		(infop->REG11)
#define	r12		(infop->REG12)
#define	r13		(infop->REG13)
#define	fp		(infop->REG13)
#define	sp		(infop->Sp)
#define	acc_high	(infop->Ach)
#define	acc_low		(infop->Acl)
#define	pc		(infop->Pc)
#define	psl		(infop->Psl)

#define	PCOUNTER		15
#define	SPOINTER		14


/*
 * Setting new condition codes for the process.
#define Set_psl(z)	asm("	movl	z,r6"); \
			asm("	andl2	$15,r6"); \
			asm("	mnegl	$1,r7"); \
			asm("	xorl2	r6,r7"); \
			asm("	andl2	$15,r7"); \
			asm("	bicpsw	r7"); \
			asm("	bispsw	r6")
 */
#define Set_psl(z)	asm("	andl2	$15,z"); \
			asm("	mnegl	$1,r6"); \
			asm("	xorl2	z,r6"); \
			asm("	andl2	$15,r6"); \
			asm("	bicpsw	r6"); \
			asm("	bispsw	z")
#define	New_cc(x)	(x) &= PSL_ALLCC; psl = psl & ~PSL_ALLCC | (x)

#endif

/*
 * Definitions for ret_code. NOTE : DON"T USE 0 !! locore.s knows that
 *	0 means OK, no problems !
 */

#define	ILL_ADDRMOD	1
#define	ILL_ACCESS	2
#define	ILL_OPRND	3
#define	ARITHMETIC	4
#define	ALIGNMENT	5

/*
 * For use in u.u_eosys as a flag.
 */
#define	EMULATEALIGN	0x80