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
|
/* $Id: rtrap.S,v 1.61 2002/02/09 19:49:31 davem Exp $
* rtrap.S: Preparing for return from trap on Sparc V9.
*
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/config.h>
#include <asm/asi.h>
#include <asm/pstate.h>
#include <asm/ptrace.h>
#include <asm/spitfire.h>
#include <asm/head.h>
#include <asm/visasm.h>
#include <asm/processor.h>
#define RTRAP_PSTATE (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE)
#define RTRAP_PSTATE_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV)
#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG)
/* Register %l6 keeps track of whether we are returning
* from a system call or not. It is cleared if we call
* do_notify_resume, and it must not be otherwise modified
* until we fully commit to returning to userspace.
*/
.text
.align 32
__handle_softirq:
call do_softirq
nop
ba,a,pt %xcc, __handle_softirq_continue
nop
__handle_preemption:
call schedule
wrpr %g0, RTRAP_PSTATE, %pstate
ba,pt %xcc, __handle_preemption_continue
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
__handle_user_windows:
call fault_in_user_windows
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
/* Redo sched+sig checks */
ldx [%g6 + TI_FLAGS], %l0
andcc %l0, _TIF_NEED_RESCHED, %g0
be,pt %xcc, 1f
nop
call schedule
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
ldx [%g6 + TI_FLAGS], %l0
1: andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
be,pt %xcc, __handle_user_windows_continue
nop
mov %l5, %o1
mov %l6, %o2
add %sp, PTREGS_OFF, %o0
mov %l0, %o3
call do_notify_resume
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
clr %l6
/* Signal delivery can modify pt_regs tstate, so we must
* reload it.
*/
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
sethi %hi(0xf << 20), %l4
and %l1, %l4, %l4
ba,pt %xcc, __handle_user_windows_continue
andn %l1, %l4, %l1
__handle_perfctrs:
call update_perfctrs
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
ldub [%g6 + TI_WSAVED], %o2
brz,pt %o2, 1f
nop
/* Redo userwin+sched+sig checks */
call fault_in_user_windows
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
ldx [%g6 + TI_FLAGS], %l0
andcc %l0, _TIF_NEED_RESCHED, %g0
be,pt %xcc, 1f
nop
call schedule
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
ldx [%g6 + TI_FLAGS], %l0
1: andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
be,pt %xcc, __handle_perfctrs_continue
sethi %hi(TSTATE_PEF), %o0
mov %l5, %o1
mov %l6, %o2
add %sp, PTREGS_OFF, %o0
mov %l0, %o3
call do_notify_resume
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
clr %l6
/* Signal delivery can modify pt_regs tstate, so we must
* reload it.
*/
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
sethi %hi(0xf << 20), %l4
and %l1, %l4, %l4
andn %l1, %l4, %l1
ba,pt %xcc, __handle_perfctrs_continue
sethi %hi(TSTATE_PEF), %o0
__handle_userfpu:
rd %fprs, %l5
andcc %l5, FPRS_FEF, %g0
sethi %hi(TSTATE_PEF), %o0
be,a,pn %icc, __handle_userfpu_continue
andn %l1, %o0, %l1
ba,a,pt %xcc, __handle_userfpu_continue
__handle_signal:
mov %l5, %o1
mov %l6, %o2
add %sp, PTREGS_OFF, %o0
mov %l0, %o3
call do_notify_resume
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
clr %l6
/* Signal delivery can modify pt_regs tstate, so we must
* reload it.
*/
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
sethi %hi(0xf << 20), %l4
and %l1, %l4, %l4
ba,pt %xcc, __handle_signal_continue
andn %l1, %l4, %l1
.align 64
.globl rtrap_irq, rtrap_clr_l6, rtrap, irqsz_patchme, rtrap_xcall
rtrap_irq:
rtrap_clr_l6: clr %l6
rtrap:
#ifndef CONFIG_SMP
sethi %hi(per_cpu____cpu_data), %l0
lduw [%l0 + %lo(per_cpu____cpu_data)], %l1
#else
sethi %hi(per_cpu____cpu_data), %l0
or %l0, %lo(per_cpu____cpu_data), %l0
lduw [%l0 + %g5], %l1
#endif
cmp %l1, 0
/* mm/ultra.S:xcall_report_regs KNOWS about this load. */
bne,pn %icc, __handle_softirq
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
__handle_softirq_continue:
rtrap_xcall:
sethi %hi(0xf << 20), %l4
andcc %l1, TSTATE_PRIV, %l3
and %l1, %l4, %l4
bne,pn %icc, to_kernel
andn %l1, %l4, %l1
/* We must hold IRQs off and atomically test schedule+signal
* state, then hold them off all the way back to userspace.
* If we are returning to kernel, none of this matters.
*
* If we do not do this, there is a window where we would do
* the tests, later the signal/resched event arrives but we do
* not process it since we are still in kernel mode. It would
* take until the next local IRQ before the signal/resched
* event would be handled.
*
* This also means that if we have to deal with performance
* counters or user windows, we have to redo all of these
* sched+signal checks with IRQs disabled.
*/
to_user: wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
wrpr 0, %pil
__handle_preemption_continue:
ldx [%g6 + TI_FLAGS], %l0
sethi %hi(_TIF_USER_WORK_MASK), %o0
or %o0, %lo(_TIF_USER_WORK_MASK), %o0
andcc %l0, %o0, %g0
sethi %hi(TSTATE_PEF), %o0
be,pt %xcc, user_nowork
andcc %l1, %o0, %g0
andcc %l0, _TIF_NEED_RESCHED, %g0
bne,pn %xcc, __handle_preemption
andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
bne,pn %xcc, __handle_signal
__handle_signal_continue:
ldub [%g6 + TI_WSAVED], %o2
brnz,pn %o2, __handle_user_windows
nop
__handle_user_windows_continue:
ldx [%g6 + TI_FLAGS], %l5
andcc %l5, _TIF_PERFCTR, %g0
sethi %hi(TSTATE_PEF), %o0
bne,pn %xcc, __handle_perfctrs
__handle_perfctrs_continue:
andcc %l1, %o0, %g0
/* This fpdepth clear is necessary for non-syscall rtraps only */
user_nowork:
bne,pn %xcc, __handle_userfpu
stb %g0, [%g6 + TI_FPDEPTH]
__handle_userfpu_continue:
rt_continue: ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
ldx [%sp + PTREGS_OFF + PT_V9_G2], %g2
ldx [%sp + PTREGS_OFF + PT_V9_G3], %g3
ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4
ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5
brz,pt %l3, 1f
nop
/* Must do this before thread reg is clobbered below. */
LOAD_PER_CPU_BASE(%g6, %g7)
1:
ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6
ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7
wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %pstate
ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
ldx [%sp + PTREGS_OFF + PT_V9_I6], %i6
ldx [%sp + PTREGS_OFF + PT_V9_I7], %i7
ldx [%sp + PTREGS_OFF + PT_V9_TPC], %l2
ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %o2
ld [%sp + PTREGS_OFF + PT_V9_Y], %o3
wr %o3, %g0, %y
srl %l4, 20, %l4
wrpr %l4, 0x0, %pil
wrpr %g0, 0x1, %tl
wrpr %l1, %g0, %tstate
wrpr %l2, %g0, %tpc
wrpr %o2, %g0, %tnpc
brnz,pn %l3, kern_rtt
mov PRIMARY_CONTEXT, %l7
ldxa [%l7 + %l7] ASI_DMMU, %l0
sethi %hi(sparc64_kern_pri_nuc_bits), %l1
ldx [%l1 + %lo(sparc64_kern_pri_nuc_bits)], %l1
or %l0, %l1, %l0
stxa %l0, [%l7] ASI_DMMU
sethi %hi(KERNBASE), %l7
flush %l7
rdpr %wstate, %l1
rdpr %otherwin, %l2
srl %l1, 3, %l1
wrpr %l2, %g0, %canrestore
wrpr %l1, %g0, %wstate
wrpr %g0, %g0, %otherwin
restore
rdpr %canrestore, %g1
wrpr %g1, 0x0, %cleanwin
retry
nop
kern_rtt: restore
retry
to_kernel:
#ifdef CONFIG_PREEMPT
ldsw [%g6 + TI_PRE_COUNT], %l5
brnz %l5, kern_fpucheck
ldx [%g6 + TI_FLAGS], %l5
andcc %l5, _TIF_NEED_RESCHED, %g0
be,pt %xcc, kern_fpucheck
srl %l4, 20, %l5
cmp %l5, 0
bne,pn %xcc, kern_fpucheck
sethi %hi(PREEMPT_ACTIVE), %l6
stw %l6, [%g6 + TI_PRE_COUNT]
call schedule
nop
ba,pt %xcc, rtrap
stw %g0, [%g6 + TI_PRE_COUNT]
#endif
kern_fpucheck: ldub [%g6 + TI_FPDEPTH], %l5
brz,pt %l5, rt_continue
srl %l5, 1, %o0
add %g6, TI_FPSAVED, %l6
ldub [%l6 + %o0], %l2
sub %l5, 2, %l5
add %g6, TI_GSR, %o1
andcc %l2, (FPRS_FEF|FPRS_DU), %g0
be,pt %icc, 2f
and %l2, FPRS_DL, %l6
andcc %l2, FPRS_FEF, %g0
be,pn %icc, 5f
sll %o0, 3, %o5
rd %fprs, %g1
wr %g1, FPRS_FEF, %fprs
ldx [%o1 + %o5], %g1
add %g6, TI_XFSR, %o1
sll %o0, 8, %o2
add %g6, TI_FPREGS, %o3
brz,pn %l6, 1f
add %g6, TI_FPREGS+0x40, %o4
membar #Sync
ldda [%o3 + %o2] ASI_BLK_P, %f0
ldda [%o4 + %o2] ASI_BLK_P, %f16
membar #Sync
1: andcc %l2, FPRS_DU, %g0
be,pn %icc, 1f
wr %g1, 0, %gsr
add %o2, 0x80, %o2
membar #Sync
ldda [%o3 + %o2] ASI_BLK_P, %f32
ldda [%o4 + %o2] ASI_BLK_P, %f48
1: membar #Sync
ldx [%o1 + %o5], %fsr
2: stb %l5, [%g6 + TI_FPDEPTH]
ba,pt %xcc, rt_continue
nop
5: wr %g0, FPRS_FEF, %fprs
sll %o0, 8, %o2
add %g6, TI_FPREGS+0x80, %o3
add %g6, TI_FPREGS+0xc0, %o4
membar #Sync
ldda [%o3 + %o2] ASI_BLK_P, %f32
ldda [%o4 + %o2] ASI_BLK_P, %f48
membar #Sync
wr %g0, FPRS_DU, %fprs
ba,pt %xcc, rt_continue
stb %l5, [%g6 + TI_FPDEPTH]
|
