summaryrefslogtreecommitdiffstats
path: root/arch/blackfin/include/asm/entry.h
blob: f031c86d76e0b74fa2cd2a3e0692341391cd3c4c (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
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
/*
 * U-boot - entry.h Routines for context saving and restoring
 *
 * Copyright (c) 2005 blackfin.uclinux.org
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#ifndef __BLACKFIN_ENTRY_H
#define __BLACKFIN_ENTRY_H

#include <asm/setup.h>
#include <asm/page.h>

/*
 * Stack layout in 'ret_from_exception':
 *
 */

/*
 * Register %p2 is now set to the current task throughout
 * the whole kernel.
 */

#ifdef __ASSEMBLY__

#define	LFLUSH_I_AND_D	0x00000808
#define	LSIGTRAP	5

/* process bits for task_struct.flags */
#define	PF_TRACESYS_OFF	3
#define	PF_TRACESYS_BIT	5
#define	PF_PTRACED_OFF	3
#define	PF_PTRACED_BIT	4
#define	PF_DTRACE_OFF	1
#define	PF_DTRACE_BIT	5

#define NEW_PT_REGS

#if defined(NEW_PT_REGS)

#define SAVE_ALL_INT		save_context_no_interrupts
#define SAVE_ALL_SYS		save_context_no_interrupts
#define SAVE_CONTEXT		save_context_with_interrupts

#define RESTORE_ALL		restore_context_no_interrupts
#define RESTORE_ALL_SYS		restore_context_no_interrupts
#define RESTORE_CONTEXT		restore_context_with_interrupts

#else

#define SAVE_ALL_INT		save_all_int
#define SAVE_ALL_SYS		save_all_sys
#define SAVE_CONTEXT		save_context
#define RESTORE_ALL		restore_context
#define RESTORE_CONTEXT		restore_context

#endif

/*
 * Code to save processor context.
 * We even save the register which are preserved by a function call
 * - r4, r5, r6, r7, p3, p4, p5
 */
.macro save_context_with_interrupts
	[--sp] = R0;
	[--sp] = ( R7:0, P5:0 );
	[--sp] = fp;
	[--sp] = usp;

	[--sp] = i0;
	[--sp] = i1;
	[--sp] = i2;
	[--sp] = i3;

	[--sp] = m0;
	[--sp] = m1;
	[--sp] = m2;
	[--sp] = m3;

	[--sp] = l0;
	[--sp] = l1;
	[--sp] = l2;
	[--sp] = l3;

	[--sp] = b0;
	[--sp] = b1;
	[--sp] = b2;
	[--sp] = b3;
	[--sp] = a0.x;
	[--sp] = a0.w;
	[--sp] = a1.x;
	[--sp] = a1.w;

	[--sp] = LC0;
	[--sp] = LC1;
	[--sp] = LT0;
	[--sp] = LT1;
	[--sp] = LB0;
	[--sp] = LB1;

	[--sp] = ASTAT;

	[--sp] = r0;	/* Skip reserved */
	[--sp] = RETS;
	[--sp] = RETI;
	[--sp] = RETX;
	[--sp] = RETN;
	[--sp] = RETE;
	[--sp] = SEQSTAT;
	[--sp] = SYSCFG;
	[--sp] = r0;	/* Skip IPEND as well. */
.endm

.macro save_context_no_interrupts
	[--sp] = R0;
	[--sp] = ( R7:0, P5:0 );
	[--sp] = fp;
	[--sp] = usp;

	[--sp] = i0;
	[--sp] = i1;
	[--sp] = i2;
	[--sp] = i3;

	[--sp] = m0;
	[--sp] = m1;
	[--sp] = m2;
	[--sp] = m3;

	[--sp] = l0;
	[--sp] = l1;
	[--sp] = l2;
	[--sp] = l3;

	[--sp] = b0;
	[--sp] = b1;
	[--sp] = b2;
	[--sp] = b3;
	[--sp] = a0.x;
	[--sp] = a0.w;
	[--sp] = a1.x;
	[--sp] = a1.w;

	[--sp] = LC0;
	[--sp] = LC1;
	[--sp] = LT0;
	[--sp] = LT1;
	[--sp] = LB0;
	[--sp] = LB1;

	[--sp] = ASTAT;

	[--sp] = r0;	/* Skip reserved */
	[--sp] = RETS;
	r0 = RETI;
	[--sp] = r0;
	[--sp] = RETX;
	[--sp] = RETN;
	[--sp] = RETE;
	[--sp] = SEQSTAT;
	[--sp] = SYSCFG;
	[--sp] = r0;	/* Skip IPEND as well. */
.endm

.macro restore_context_no_interrupts
	sp += 4;
	SYSCFG = [sp++];
	SEQSTAT = [sp++];
	RETE = [sp++];
	RETN = [sp++];
	RETX = [sp++];
	r0 = [sp++];
	RETI = r0;
	RETS = [sp++];

	sp += 4;

	ASTAT = [sp++];

	LB1 = [sp++];
	LB0 = [sp++];
	LT1 = [sp++];
	LT0 = [sp++];
	LC1 = [sp++];
	LC0 = [sp++];

	a1.w = [sp++];
	a1.x = [sp++];
	a0.w = [sp++];
	a0.x = [sp++];
	b3 = [sp++];
	b2 = [sp++];
	b1 = [sp++];
	b0 = [sp++];

	l3 = [sp++];
	l2 = [sp++];
	l1 = [sp++];
	l0 = [sp++];

	m3 = [sp++];
	m2 = [sp++];
	m1 = [sp++];
	m0 = [sp++];

	i3 = [sp++];
	i2 = [sp++];
	i1 = [sp++];
	i0 = [sp++];

	sp += 4;
	fp = [sp++];

	( R7 : 0, P5 : 0) = [ SP ++ ];
	sp += 4;
.endm

.macro restore_context_with_interrupts
	sp += 4;
	SYSCFG = [sp++];
	SEQSTAT = [sp++];
	RETE = [sp++];
	RETN = [sp++];
	RETX = [sp++];
	RETI = [sp++];
	RETS = [sp++];

	sp += 4;

	ASTAT = [sp++];

	LB1 = [sp++];
	LB0 = [sp++];
	LT1 = [sp++];
	LT0 = [sp++];
	LC1 = [sp++];
	LC0 = [sp++];

	a1.w = [sp++];
	a1.x = [sp++];
	a0.w = [sp++];
	a0.x = [sp++];
	b3 = [sp++];
	b2 = [sp++];
	b1 = [sp++];
	b0 = [sp++];

	l3 = [sp++];
	l2 = [sp++];
	l1 = [sp++];
	l0 = [sp++];

	m3 = [sp++];
	m2 = [sp++];
	m1 = [sp++];
	m0 = [sp++];

	i3 = [sp++];
	i2 = [sp++];
	i1 = [sp++];
	i0 = [sp++];

	sp += 4;
	fp = [sp++];

	( R7 : 0, P5 : 0) = [ SP ++ ];
	sp += 4;
.endm

#if !defined(NEW_PT_REGS)
/*
 * a -1 in the orig_r0 field signifies
 * that the stack frame is NOT for syscall
 */
.macro	save_all_int
/* reserved and disable the single step of SYSCFG, by Steven Chen 03/07/10 */
	[--sp] = r0;
	r0.l = 0x30;		/* Errata for BF533 */
	r0.h = 0x0;
	syscfg = r0;		/* disable single step flag in SYSCFG */
	r0 = [sp++];
	[--sp] = syscfg;	/* store SYSCFG */

	[--sp] = r0;	/* Reserved for IPEND */
	[--sp] = fp;
	[--sp] = usp;
	[--sp] = r0;

	[--sp] = r0;
	r0 = [sp + 8];
	[--sp] = a0.x;
	[--sp] = a1.x;
	[--sp] = a0.w;
	[--sp] = a1.w;
	[--sp] = rets;
	[--sp] = astat;
	[--sp] = seqstat;
	[--sp] = retx;	/* current pc when exception happens */
	[--sp] = ( r7:5, p5:0 );
	[--sp] = r1;
	[--sp] = r2;
	[--sp] = r4;
	[--sp] = r3;
.endm

.macro	save_all_sys
	[--sp] = r0;
	[--sp] = r0;
	[--sp] = a0.x;
	[--sp] = a1.x;
	[--sp] = a0.w;
	[--sp] = a1.w;
	[--sp] = rets;
	[--sp] = astat;
	[--sp] = seqstat;
	[--sp] = retx;	/* current pc when exception happens */
	[--sp] = ( r7:5, p5:0 );
	[--sp] = r1;
	[--sp] = r2;
	[--sp] = r4;
	[--sp] = r3;
.endm

.macro	restore_all
	r3 = [sp++];
	r4 = [sp++];
	r2 = [sp++];
	r1 = [sp++];
	( r7:5, p5:0 ) = [sp++];
	retx = [sp++];
	seqstat = [sp++];
	astat = [sp++];
	rets = [sp++];
	a1.w = [sp++];
	a0.w = [sp++];
	a1.x = [sp++];
	a0.x = [sp++];
	sp += 4;	/* orig r0 */
	r0 = [sp++];

	sp += 4;
	fp = [sp++];
	sp +=4;		/* Skip the IPEND */

	syscfg = [sp++];

.endm

#endif

#define STR(X) 			STR1(X)
#define STR1(X) 		#X

#if defined(NEW_PT_REGS)

#define PT_OFF_ORIG_R0		208
#define PT_OFF_SR		8

#else

#define PT_OFF_ORIG_R0		0x54
#define PT_OFF_SR		0x38	/* seqstat in pt_regs */

#endif
#endif

#endif