[unix-history] / usr / src / sys / tahoe / align / Awrite_byte.c

/*	Awrite_byte.c	1.2	90/12/04	*/

#include	"align.h"

write_byte (infop,byte, where)
process_info	*infop;
long		byte; 
struct oprnd 	*where;
/*
/*	Put the 'byte' at the given address in
/*	tahoe's memory.
/*	
/*	1. Only the least significant byte is written.
/*
/**************************************************/
{
	register struct operand_des *look_at;

	look_at = &Table[opCODE].operand[last_operand];
	if (! (look_at->add_modes & NOVF))
		if (byte > 0x7f || byte < -0x80) overflow_1;	
	if (!(where->mode & W)) exception(infop, ILL_ADDRMOD);
	switch (where->mode & ADDFIELD)	/* Mask out R/W bits */
	{
	case Add:
		put_byte(infop, byte, where->address);
		break;
	case Dir:
		Replace (infop, where->reg_number, byte);
		break;
	case SPmode:
		where->mode = where->mode & ~SPmode | Add;
		write_longword (infop, byte, where);
		break;
	default:
		printf("Unknown destination in write_byte (alignment code)\n");
	};
}
Commit	Line	Data
6499767c	1	/* Awrite_byte.c 1.2 90/12/04 */
84114849	2
6499767c	3	#include "align.h"
84114849 SL	4
	5	write_byte (infop,byte, where)
	6	process_info *infop;
	7	long byte;
	8	struct oprnd *where;
	9	/*
	10	/* Put the 'byte' at the given address in
	11	/* tahoe's memory.
	12	/*
	13	/* 1. Only the least significant byte is written.
	14	/*
	15	/**************************************************/
	16	{
	17	register struct operand_des *look_at;
	18
	19	look_at = &Table[opCODE].operand[last_operand];
	20	if (! (look_at->add_modes & NOVF))
	21	if (byte > 0x7f \|\| byte < -0x80) overflow_1;
	22	if (!(where->mode & W)) exception(infop, ILL_ADDRMOD);
	23	switch (where->mode & ADDFIELD) /* Mask out R/W bits */
	24	{
	25	case Add:
	26	put_byte(infop, byte, where->address);
	27	break;
	28	case Dir:
	29	Replace (infop, where->reg_number, byte);
	30	break;
	31	case SPmode:
	32	where->mode = where->mode & ~SPmode \| Add;
	33	write_longword (infop, byte, where);
	34	break;
	35	default:
	36	printf("Unknown destination in write_byte (alignment code)\n");
	37	};
	38	}