ifpsp060/src/isp.S

24 so long as this entire notice is retained without alteration in any modified and/or
26 No licenses are granted by implication, estoppel or otherwise under any patents
27 or trademarks of Motorola, Inc.
370 # _compandset2(), or _chk2_cmp2() as appropriate.			#
376 # _real_divbyzero() or _real_chk() as appropriate. In addition, all	#
380 #	Meanwhile, if any read or write to memory using the		#
404 	btst		&0x5,EXC_ISR(%a6)	# from s or u mode?
466 	btst		&0x1e,%d0		# group1 or group2
581 	btst		&0x5,EXC_ISR(%a6)	# user or supervisor?
802 # this is the exit point if a data read or write fails.
839 	btst		&0x5,(%sp)		# user or supervisor?
845 # if the addressing mode was (an)+ or -(an), the address register must
1334 	beq.b		addr_ind_index_8bit	# for ext word or not?
1352 	btst		&0xb,%d0		# is it word or long?
1374 #	plus the number of bytes in the data type(2 or 4).		#
1451 # word or long
1468 	btst		&0xb,%d0		# is index word or long?
1502 	btst		&0xb,%d5		# is index word or long?
1570 	btst		&0x2,%d5		# pre or post indexing?
1637 # either read or write the required bytes from/to memory. Use the	#
1661 	btst		&0x7,%d1		# (reg 2 mem) or (mem 2 reg)
1672 	btst		&0x6,%d1		# word or long operation?
1746 	btst		&0x6,%d1		# word or long operation?
1876 # word, or longword sized operands. Then, in the interest of		#
1878 # operation is byte, word, or long. The bounds are sign extended	#
1894 # either predecrement, postincrement, or immediate.
1990 	or.b		%d4, %d3		# combine w/ earlier ccodes
1995 	or.b		%d3, %d4		# insert new ccodes
2046 #	isp_restore() - restore An on access error w/ -() or ()+	#
2063 # Send failures to isp_dacc() or isp_iacc() as appropriate.		#
2066 # or 32-bit divides if possible. Else, use a special math algorithm	#
2090 	bne.w		dcontrolmodel_s		# %dn dest or control mode?
2112 	btst		&0x3, EXC_EXTWORD(%a6)	# signed or unsigned?
2243 # the first two quotient words must be zero, or overflow would occur.
2464 # (an)+ or -(an) in which case the previous "an" value must be restored.
2484 #	isp_restore() - restore An on access error w/ -() or ()+	#
2501 # Send failures to isp_dacc() or isp_iacc() as appropriate.		#
2516 	cmpi.b		%d0, &0x7		# is src mode Dn or other?
2546 	btst		&0x3, EXC_EXTWORD(%a6)	# signed or unsigned?
2554 # the result sign is the exclusive or of the operand sign bits.
2645 	or.b		%d7, %d6		# group 'X' and 'N'
2650 # one or both of the operands is zero so the result is also zero.
2699 # (an)+ or -(an) in which case the previous "an" value must be restored.
2737 #	None (register file or memroy changed as appropriate)		#
2801 	btst		&0x1,EXC_OPWORD(%a6)	# word or long?
2804 	btst		&0x5,EXC_ISR(%a6)	# user or supervisor?
2951 #	d7 = word or longword flag					#
2969 # that actually emulates cas can be supplied by the external os or	#
3005 	btst		&0x1,EXC_OPWORD(%a6)	# word or long operation?
3101 	cmpi.b		EXC_OPWORD+1(%a6),&0xfc	# cas or cas2?
3105 	btst		&0x1,EXC_OPWORD(%a6)	# word or long operation?
3122 	bsr.l		isp_restore		# restore An (if ()+ or -())
3195 #	    according to whether exception occurred in user or		#
3223 # operands. A misaligned operand must be written in aligned chunks or	#
3257 	tst.b		%d6			# user or supervisor mode?
3265 	tst.b		%d7			# word or longword?
3815 #	    SFC/DFC according to whether exception occurred in user or	#
3840 # operand. A misaligned operand must be written in aligned chunks or	#
3855 # D6 = supervisor ('xxxxxxff) or user mode ('xxxxxx00)	#
3856 # D7 = longword ('xxxxxxff) or word size ('xxxxxx00)	#
3869 	tst.b		%d6			# user or supervisor mode?
3878 	tst.b		%d7			# word or longword?
4041 	mov.l		%a0,%d1			# byte or word misaligned?