summaryrefslogtreecommitdiff
path: root/arch/m68k/math-emu/fp_entry.S
blob: 916c6f3d1f0773b4d8478d94fd6fdb75839d8829 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
/*
 * fp_emu.S
 *
 * Copyright Roman Zippel, 1997.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, and the entire permission notice in its entirety,
 *    including the disclaimer of warranties.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * ALTERNATIVELY, this product may be distributed under the terms of
 * the GNU General Public License, in which case the provisions of the GPL are
 * required INSTEAD OF the above restrictions.  (This clause is
 * necessary due to a potential bad interaction between the GPL and
 * the restrictions contained in a BSD-style copyright.)
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/linkage.h>
#include <asm/entry.h>

#include "fp_emu.h"

	.globl	fpu_emu
	.globl	fp_debugprint
	.globl	fp_err_ua1,fp_err_ua2

	.text
fpu_emu:
	SAVE_ALL_INT
	GET_CURRENT(%d0)

#if defined(CPU_M68020_OR_M68030) && defined(CPU_M68040_OR_M68060)
        tst.l	m68k_is040or060
        jeq	1f
#endif
#if defined(CPU_M68040_OR_M68060)
	move.l	(FPS_PC2,%sp),(FPS_PC,%sp)
#endif
1:
	| emulate the instruction
	jsr	fp_scan

#if defined(CONFIG_M68060)
#if !defined(CPU_M68060_ONLY)
	btst	#3,m68k_cputype+3
	jeq	1f
#endif
	btst	#7,(FPS_SR,%sp)
	jne	fp_sendtrace060
#endif
1:
	| emulation successful?
	tst.l	%d0
	jeq	ret_from_exception

	| send some signal to program here

	jra	ret_from_exception

	| we jump here after an access error while trying to access
	| user space, we correct stackpointer and send a SIGSEGV to
	| the user process
fp_err_ua2:
	addq.l	#4,%sp
fp_err_ua1:
	addq.l	#4,%sp
	move.l	%a0,-(%sp)
	pea	SEGV_MAPERR
	pea	SIGSEGV
	jsr	fpemu_signal
	add.w	#12,%sp
	jra	ret_from_exception

#if defined(CONFIG_M68060)
	| send a trace signal if we are debugged
	| it does not really belong here, but...
fp_sendtrace060:
	move.l	(FPS_PC,%sp),-(%sp)
	pea	TRAP_TRACE
	pea	SIGTRAP
	jsr	fpemu_signal
	add.w	#12,%sp
	jra	ret_from_exception
#endif

	.globl	fp_get_data_reg, fp_put_data_reg
	.globl	fp_get_addr_reg, fp_put_addr_reg

	| Entry points to get/put a register. Some of them can be get/put
	| directly, others are on the stack, as we read/write the stack
	| directly here, these function may only be called from within
	| instruction decoding, otherwise the stack pointer is incorrect
	| and the stack gets corrupted.
fp_get_data_reg:
	jmp	([0f:w,%pc,%d0.w*4])

	.align	4
0:
	.long	fp_get_d0, fp_get_d1
	.long	fp_get_d2, fp_get_d3
	.long	fp_get_d4, fp_get_d5
	.long	fp_get_d6, fp_get_d7

fp_get_d0:
	move.l	(PT_OFF_D0+8,%sp),%d0
	printf	PREGISTER,"{d0->%08x}",1,%d0
	rts

fp_get_d1:
	move.l	(PT_OFF_D1+8,%sp),%d0
	printf	PREGISTER,"{d1->%08x}",1,%d0
	rts

fp_get_d2:
	move.l	(PT_OFF_D2+8,%sp),%d0
	printf	PREGISTER,"{d2->%08x}",1,%d0
	rts

fp_get_d3:
	move.l	%d3,%d0
	printf	PREGISTER,"{d3->%08x}",1,%d0
	rts

fp_get_d4:
	move.l	%d4,%d0
	printf	PREGISTER,"{d4->%08x}",1,%d0
	rts

fp_get_d5:
	move.l	%d5,%d0
	printf	PREGISTER,"{d5->%08x}",1,%d0
	rts

fp_get_d6:
	move.l	%d6,%d0
	printf	PREGISTER,"{d6->%08x}",1,%d0
	rts

fp_get_d7:
	move.l	%d7,%d0
	printf	PREGISTER,"{d7->%08x}",1,%d0
	rts

fp_put_data_reg:
	jmp	([0f:w,%pc,%d1.w*4])

	.align	4
0:
	.long	fp_put_d0, fp_put_d1
	.long	fp_put_d2, fp_put_d3
	.long	fp_put_d4, fp_put_d5
	.long	fp_put_d6, fp_put_d7

fp_put_d0:
	printf	PREGISTER,"{d0<-%08x}",1,%d0
	move.l	%d0,(PT_OFF_D0+8,%sp)
	rts

fp_put_d1:
	printf	PREGISTER,"{d1<-%08x}",1,%d0
	move.l	%d0,(PT_OFF_D1+8,%sp)
	rts

fp_put_d2:
	printf	PREGISTER,"{d2<-%08x}",1,%d0
	move.l	%d0,(PT_OFF_D2+8,%sp)
	rts

fp_put_d3:
	printf	PREGISTER,"{d3<-%08x}",1,%d0
|	move.l	%d0,%d3
	move.l	%d0,(PT_OFF_D3+8,%sp)
	rts

fp_put_d4:
	printf	PREGISTER,"{d4<-%08x}",1,%d0
|	move.l	%d0,%d4
	move.l	%d0,(PT_OFF_D4+8,%sp)
	rts

fp_put_d5:
	printf	PREGISTER,"{d5<-%08x}",1,%d0
|	move.l	%d0,%d5
	move.l	%d0,(PT_OFF_D5+8,%sp)
	rts

fp_put_d6:
	printf	PREGISTER,"{d6<-%08x}",1,%d0
	move.l	%d0,%d6
	rts

fp_put_d7:
	printf	PREGISTER,"{d7<-%08x}",1,%d0
	move.l	%d0,%d7
	rts

fp_get_addr_reg:
	jmp	([0f:w,%pc,%d0.w*4])

	.align	4
0:
	.long	fp_get_a0, fp_get_a1
	.long	fp_get_a2, fp_get_a3
	.long	fp_get_a4, fp_get_a5
	.long	fp_get_a6, fp_get_a7

fp_get_a0:
	move.l	(PT_OFF_A0+8,%sp),%a0
	printf	PREGISTER,"{a0->%08x}",1,%a0
	rts

fp_get_a1:
	move.l	(PT_OFF_A1+8,%sp),%a0
	printf	PREGISTER,"{a1->%08x}",1,%a0
	rts

fp_get_a2:
	move.l	(PT_OFF_A2+8,%sp),%a0
	printf	PREGISTER,"{a2->%08x}",1,%a0
	rts

fp_get_a3:
	move.l	%a3,%a0
	printf	PREGISTER,"{a3->%08x}",1,%a0
	rts

fp_get_a4:
	move.l	%a4,%a0
	printf	PREGISTER,"{a4->%08x}",1,%a0
	rts

fp_get_a5:
	move.l	%a5,%a0
	printf	PREGISTER,"{a5->%08x}",1,%a0
	rts

fp_get_a6:
	move.l	%a6,%a0
	printf	PREGISTER,"{a6->%08x}",1,%a0
	rts

fp_get_a7:
	move.l	%usp,%a0
	printf	PREGISTER,"{a7->%08x}",1,%a0
	rts

fp_put_addr_reg:
	jmp	([0f:w,%pc,%d0.w*4])

	.align	4
0:
	.long	fp_put_a0, fp_put_a1
	.long	fp_put_a2, fp_put_a3
	.long	fp_put_a4, fp_put_a5
	.long	fp_put_a6, fp_put_a7

fp_put_a0:
	printf	PREGISTER,"{a0<-%08x}",1,%a0
	move.l	%a0,(PT_OFF_A0+8,%sp)
	rts

fp_put_a1:
	printf	PREGISTER,"{a1<-%08x}",1,%a0
	move.l	%a0,(PT_OFF_A1+8,%sp)
	rts

fp_put_a2:
	printf	PREGISTER,"{a2<-%08x}",1,%a0
	move.l	%a0,(PT_OFF_A2+8,%sp)
	rts

fp_put_a3:
	printf	PREGISTER,"{a3<-%08x}",1,%a0
	move.l	%a0,%a3
	rts

fp_put_a4:
	printf	PREGISTER,"{a4<-%08x}",1,%a0
	move.l	%a0,%a4
	rts

fp_put_a5:
	printf	PREGISTER,"{a5<-%08x}",1,%a0
	move.l	%a0,%a5
	rts

fp_put_a6:
	printf	PREGISTER,"{a6<-%08x}",1,%a0
	move.l	%a0,%a6
	rts

fp_put_a7:
	printf	PREGISTER,"{a7<-%08x}",1,%a0
	move.l	%a0,%usp
	rts

	.data
	.align	4

fp_debugprint:
|	.long	PMDECODE
	.long	PMINSTR+PMDECODE+PMCONV+PMNORM
|	.long	PMCONV+PMNORM+PMINSTR
|	.long	0