m68k/fpsp040/fpsp.h

11 |	fpsp.h --- stack frame offsets during FPSP exception handling
18 |		link	a6,#-LOCAL_SIZE
19 |		fsave	-(a7)
20 |		movem.l	d0-d1/a0-a1,USER_DA(a6)
21 |		fmovem.x fp0-fp3,USER_FP0(a6)
26 |	A7 --->	+-------------------------------+
30 |		+-------------------------------+
36 |		+-------------------------------+
37 |	A6 --->	|	Saved A6		|
38 |		+-------------------------------+
50 |		movem.l	USER_DA(a6),d0-d1/a0-a1
51 |		fmovem.x USER_FP0(a6),fp0-fp3
69 |	The registers d0, d1, a0, a1 and fp0-fp3 are always saved and
75 |----------------------------------------------------------------------
80 	.set	LV,-LOCAL_SIZE	| convenient base value
82 	.set	USER_DA,LV+0		| save space for D0-D1,A0-A1
89 	.set	USER_FP2,LV+40		| saved user FP2
110 	.set	CU_ONLY,LV+122		| cu-only flag
120 |--------------------------------------------------------------------------
122 |	fsave offsets and bit definitions
127 	.set	CU_SAVEPC,LV-92		| micro-pc for CU (1 byte)
128 	.set	FPR_DIRTY_BITS,LV-91		| fpr dirty bits
130 	.set	WBTEMP,LV-76		| write back temp (12 bytes)
137 	.set	FPSR_SHADOW,LV-64		| fpsr shadow reg
139 	.set	FPIARCU,LV-60		| Instr. addr. reg. for CU (4 bytes)
141 	.set	CMDREG2B,LV-52		| cmd reg for machine 2
142 	.set	CMDREG3B,LV-48		| cmd reg for E3 exceptions (2 bytes)
144 	.set	NMNEXC,LV-44		| NMNEXC (unsup,snan bits only)
148 	.set	NMCEXC,LV-43		| NMNEXC & NMCEXC
158 	.set	STAG,LV-40		| source tag (1 byte)
159 	.set	WBTEMP_GRS,LV-40		| alias wbtemp guard, round, sticky
160 	.set	guard_bit,1		| guard bit is bit number 1
161 	.set	round_bit,0		| round bit is bit number 0
163 	.set	denorm_bit,7		| bit determines if denorm or unnorm
164 	.set	etemp15_bit,4		| etemp exponent bit #15
165 	.set	wbtemp66_bit,2		| wbtemp mantissa bit #66
166 	.set	wbtemp1_bit,1		| wbtemp mantissa bit #1
167 	.set	wbtemp0_bit,0		| wbtemp mantissa bit #0
169 	.set	STICKY,LV-39		| holds sticky bit
172 	.set	CMDREG1B,LV-36		| cmd reg for E1 exceptions (2 bytes)
173 	.set	kfact_bit,12		| distinguishes static/dynamic k-factor
178 	.set	CMDWORD,LV-35		| command word in cmd1b
179 	.set	direction_bit,5		| bit 0 in opclass
180 	.set	size_bit2,12		| bit 2 in size field
182 	.set	DTAG,LV-32		| dest tag (1 byte)
184 	.set	fptemp15_bit,4		| fptemp exponent bit #15
186 	.set	WB_BYTE,LV-31		| holds WBTE15 bit (1 byte)
187 	.set	wbtemp15_bit,4		| wbtemp exponent bit #15
189 	.set	E_BYTE,LV-28		| holds E1 and E3 bits (1 byte)
190 	.set	E1,2		| which bit is E1 flag
191 	.set	E3,1		| which bit is E3 flag
192 	.set	SFLAG,0		| which bit is S flag
194 	.set	T_BYTE,LV-27		| holds T and U bits (1 byte)
195 	.set	XFLAG,7		| which bit is X flag
196 	.set	UFLAG,5		| which bit is U flag
197 	.set	TFLAG,4		| which bit is T flag
199 	.set	FPTEMP,LV-24		| fptemp (12 bytes)
206 	.set	ETEMP,LV-12		| etemp (12 bytes)
218 |--------------------------------------------------------------------------
225 	.set	nan_bit,0	|  not-a-number result
227 	.set	q_sn_bit,7	|  sign bit of quotient byte
244 |	FPSR individual bit masks
285 |--------------------------------------------------------------------------
298 |--------------------------------------------------------------------------
302 	.set	signan_bit,6	|  signalling nan bit in mantissa
305 	.set	rnd_stky_bit,29	|  round/sticky bit of mantissa
325 |					are in the $40s {$40-$4f}
330 	.set	BUSY_FRAME,LV-BUSY_SIZE	|  start of busy frame
336 	.set	IDLE_FRAME,LV-IDLE_SIZE	|  start of idle frame
341 	.set	FLINE_VEC,0x002C		|  real F-line