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-rw-r--r--arch/sparc/kernel/rtrap_64.S450
1 files changed, 450 insertions, 0 deletions
diff --git a/arch/sparc/kernel/rtrap_64.S b/arch/sparc/kernel/rtrap_64.S
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1/*
2 * rtrap.S: Preparing for return from trap on Sparc V9.
3 *
4 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8
9#include <asm/asi.h>
10#include <asm/pstate.h>
11#include <asm/ptrace.h>
12#include <asm/spitfire.h>
13#include <asm/head.h>
14#include <asm/visasm.h>
15#include <asm/processor.h>
16
17#define RTRAP_PSTATE (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE)
18#define RTRAP_PSTATE_IRQOFF (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV)
19#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG)
20
21 .text
22 .align 32
23__handle_softirq:
24 call do_softirq
25 nop
26 ba,a,pt %xcc, __handle_softirq_continue
27 nop
28__handle_preemption:
29 call schedule
30 wrpr %g0, RTRAP_PSTATE, %pstate
31 ba,pt %xcc, __handle_preemption_continue
32 wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
33
34__handle_user_windows:
35 call fault_in_user_windows
36 wrpr %g0, RTRAP_PSTATE, %pstate
37 wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
38 /* Redo sched+sig checks */
39 ldx [%g6 + TI_FLAGS], %l0
40 andcc %l0, _TIF_NEED_RESCHED, %g0
41
42 be,pt %xcc, 1f
43 nop
44 call schedule
45 wrpr %g0, RTRAP_PSTATE, %pstate
46 wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
47 ldx [%g6 + TI_FLAGS], %l0
48
491: andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
50 be,pt %xcc, __handle_user_windows_continue
51 nop
52 mov %l5, %o1
53 add %sp, PTREGS_OFF, %o0
54 mov %l0, %o2
55
56 call do_notify_resume
57 wrpr %g0, RTRAP_PSTATE, %pstate
58 wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
59 /* Signal delivery can modify pt_regs tstate, so we must
60 * reload it.
61 */
62 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
63 sethi %hi(0xf << 20), %l4
64 and %l1, %l4, %l4
65 ba,pt %xcc, __handle_user_windows_continue
66
67 andn %l1, %l4, %l1
68__handle_perfctrs:
69 call update_perfctrs
70 wrpr %g0, RTRAP_PSTATE, %pstate
71 wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
72 ldub [%g6 + TI_WSAVED], %o2
73 brz,pt %o2, 1f
74 nop
75 /* Redo userwin+sched+sig checks */
76 call fault_in_user_windows
77
78 wrpr %g0, RTRAP_PSTATE, %pstate
79 wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
80 ldx [%g6 + TI_FLAGS], %l0
81 andcc %l0, _TIF_NEED_RESCHED, %g0
82 be,pt %xcc, 1f
83
84 nop
85 call schedule
86 wrpr %g0, RTRAP_PSTATE, %pstate
87 wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
88 ldx [%g6 + TI_FLAGS], %l0
891: andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
90
91 be,pt %xcc, __handle_perfctrs_continue
92 sethi %hi(TSTATE_PEF), %o0
93 mov %l5, %o1
94 add %sp, PTREGS_OFF, %o0
95 mov %l0, %o2
96 call do_notify_resume
97
98 wrpr %g0, RTRAP_PSTATE, %pstate
99 wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
100 /* Signal delivery can modify pt_regs tstate, so we must
101 * reload it.
102 */
103 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
104 sethi %hi(0xf << 20), %l4
105 and %l1, %l4, %l4
106 andn %l1, %l4, %l1
107 ba,pt %xcc, __handle_perfctrs_continue
108
109 sethi %hi(TSTATE_PEF), %o0
110__handle_userfpu:
111 rd %fprs, %l5
112 andcc %l5, FPRS_FEF, %g0
113 sethi %hi(TSTATE_PEF), %o0
114 be,a,pn %icc, __handle_userfpu_continue
115 andn %l1, %o0, %l1
116 ba,a,pt %xcc, __handle_userfpu_continue
117
118__handle_signal:
119 mov %l5, %o1
120 add %sp, PTREGS_OFF, %o0
121 mov %l0, %o2
122 call do_notify_resume
123 wrpr %g0, RTRAP_PSTATE, %pstate
124 wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
125
126 /* Signal delivery can modify pt_regs tstate, so we must
127 * reload it.
128 */
129 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
130 sethi %hi(0xf << 20), %l4
131 and %l1, %l4, %l4
132 ba,pt %xcc, __handle_signal_continue
133 andn %l1, %l4, %l1
134
135 /* When returning from a NMI (%pil==15) interrupt we want to
136 * avoid running softirqs, doing IRQ tracing, preempting, etc.
137 */
138 .globl rtrap_nmi
139rtrap_nmi: ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
140 sethi %hi(0xf << 20), %l4
141 and %l1, %l4, %l4
142 andn %l1, %l4, %l1
143 srl %l4, 20, %l4
144 ba,pt %xcc, rtrap_no_irq_enable
145 wrpr %l4, %pil
146
147 .align 64
148 .globl rtrap_irq, rtrap, irqsz_patchme, rtrap_xcall
149rtrap_irq:
150rtrap:
151#ifndef CONFIG_SMP
152 sethi %hi(per_cpu____cpu_data), %l0
153 lduw [%l0 + %lo(per_cpu____cpu_data)], %l1
154#else
155 sethi %hi(per_cpu____cpu_data), %l0
156 or %l0, %lo(per_cpu____cpu_data), %l0
157 lduw [%l0 + %g5], %l1
158#endif
159 cmp %l1, 0
160
161 /* mm/ultra.S:xcall_report_regs KNOWS about this load. */
162 bne,pn %icc, __handle_softirq
163 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
164__handle_softirq_continue:
165rtrap_xcall:
166 sethi %hi(0xf << 20), %l4
167 and %l1, %l4, %l4
168 andn %l1, %l4, %l1
169 srl %l4, 20, %l4
170#ifdef CONFIG_TRACE_IRQFLAGS
171 brnz,pn %l4, rtrap_no_irq_enable
172 nop
173 call trace_hardirqs_on
174 nop
175 wrpr %l4, %pil
176#endif
177rtrap_no_irq_enable:
178 andcc %l1, TSTATE_PRIV, %l3
179 bne,pn %icc, to_kernel
180 nop
181
182 /* We must hold IRQs off and atomically test schedule+signal
183 * state, then hold them off all the way back to userspace.
184 * If we are returning to kernel, none of this matters. Note
185 * that we are disabling interrupts via PSTATE_IE, not using
186 * %pil.
187 *
188 * If we do not do this, there is a window where we would do
189 * the tests, later the signal/resched event arrives but we do
190 * not process it since we are still in kernel mode. It would
191 * take until the next local IRQ before the signal/resched
192 * event would be handled.
193 *
194 * This also means that if we have to deal with performance
195 * counters or user windows, we have to redo all of these
196 * sched+signal checks with IRQs disabled.
197 */
198to_user: wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
199 wrpr 0, %pil
200__handle_preemption_continue:
201 ldx [%g6 + TI_FLAGS], %l0
202 sethi %hi(_TIF_USER_WORK_MASK), %o0
203 or %o0, %lo(_TIF_USER_WORK_MASK), %o0
204 andcc %l0, %o0, %g0
205 sethi %hi(TSTATE_PEF), %o0
206 be,pt %xcc, user_nowork
207 andcc %l1, %o0, %g0
208 andcc %l0, _TIF_NEED_RESCHED, %g0
209 bne,pn %xcc, __handle_preemption
210 andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
211 bne,pn %xcc, __handle_signal
212__handle_signal_continue:
213 ldub [%g6 + TI_WSAVED], %o2
214 brnz,pn %o2, __handle_user_windows
215 nop
216__handle_user_windows_continue:
217 ldx [%g6 + TI_FLAGS], %l5
218 andcc %l5, _TIF_PERFCTR, %g0
219 sethi %hi(TSTATE_PEF), %o0
220 bne,pn %xcc, __handle_perfctrs
221__handle_perfctrs_continue:
222 andcc %l1, %o0, %g0
223
224 /* This fpdepth clear is necessary for non-syscall rtraps only */
225user_nowork:
226 bne,pn %xcc, __handle_userfpu
227 stb %g0, [%g6 + TI_FPDEPTH]
228__handle_userfpu_continue:
229
230rt_continue: ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
231 ldx [%sp + PTREGS_OFF + PT_V9_G2], %g2
232
233 ldx [%sp + PTREGS_OFF + PT_V9_G3], %g3
234 ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4
235 ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5
236 brz,pt %l3, 1f
237 mov %g6, %l2
238
239 /* Must do this before thread reg is clobbered below. */
240 LOAD_PER_CPU_BASE(%g5, %g6, %i0, %i1, %i2)
2411:
242 ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6
243 ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7
244
245 /* Normal globals are restored, go to trap globals. */
246661: wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %pstate
247 nop
248 .section .sun4v_2insn_patch, "ax"
249 .word 661b
250 wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
251 SET_GL(1)
252 .previous
253
254 mov %l2, %g6
255
256 ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
257 ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
258
259 ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
260 ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
261 ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
262 ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
263 ldx [%sp + PTREGS_OFF + PT_V9_I6], %i6
264 ldx [%sp + PTREGS_OFF + PT_V9_I7], %i7
265 ldx [%sp + PTREGS_OFF + PT_V9_TPC], %l2
266 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %o2
267
268 ld [%sp + PTREGS_OFF + PT_V9_Y], %o3
269 wr %o3, %g0, %y
270 wrpr %l4, 0x0, %pil
271 wrpr %g0, 0x1, %tl
272 andn %l1, TSTATE_SYSCALL, %l1
273 wrpr %l1, %g0, %tstate
274 wrpr %l2, %g0, %tpc
275 wrpr %o2, %g0, %tnpc
276
277 brnz,pn %l3, kern_rtt
278 mov PRIMARY_CONTEXT, %l7
279
280661: ldxa [%l7 + %l7] ASI_DMMU, %l0
281 .section .sun4v_1insn_patch, "ax"
282 .word 661b
283 ldxa [%l7 + %l7] ASI_MMU, %l0
284 .previous
285
286 sethi %hi(sparc64_kern_pri_nuc_bits), %l1
287 ldx [%l1 + %lo(sparc64_kern_pri_nuc_bits)], %l1
288 or %l0, %l1, %l0
289
290661: stxa %l0, [%l7] ASI_DMMU
291 .section .sun4v_1insn_patch, "ax"
292 .word 661b
293 stxa %l0, [%l7] ASI_MMU
294 .previous
295
296 sethi %hi(KERNBASE), %l7
297 flush %l7
298 rdpr %wstate, %l1
299 rdpr %otherwin, %l2
300 srl %l1, 3, %l1
301
302 wrpr %l2, %g0, %canrestore
303 wrpr %l1, %g0, %wstate
304 brnz,pt %l2, user_rtt_restore
305 wrpr %g0, %g0, %otherwin
306
307 ldx [%g6 + TI_FLAGS], %g3
308 wr %g0, ASI_AIUP, %asi
309 rdpr %cwp, %g1
310 andcc %g3, _TIF_32BIT, %g0
311 sub %g1, 1, %g1
312 bne,pt %xcc, user_rtt_fill_32bit
313 wrpr %g1, %cwp
314 ba,a,pt %xcc, user_rtt_fill_64bit
315
316user_rtt_fill_fixup:
317 rdpr %cwp, %g1
318 add %g1, 1, %g1
319 wrpr %g1, 0x0, %cwp
320
321 rdpr %wstate, %g2
322 sll %g2, 3, %g2
323 wrpr %g2, 0x0, %wstate
324
325 /* We know %canrestore and %otherwin are both zero. */
326
327 sethi %hi(sparc64_kern_pri_context), %g2
328 ldx [%g2 + %lo(sparc64_kern_pri_context)], %g2
329 mov PRIMARY_CONTEXT, %g1
330
331661: stxa %g2, [%g1] ASI_DMMU
332 .section .sun4v_1insn_patch, "ax"
333 .word 661b
334 stxa %g2, [%g1] ASI_MMU
335 .previous
336
337 sethi %hi(KERNBASE), %g1
338 flush %g1
339
340 or %g4, FAULT_CODE_WINFIXUP, %g4
341 stb %g4, [%g6 + TI_FAULT_CODE]
342 stx %g5, [%g6 + TI_FAULT_ADDR]
343
344 mov %g6, %l1
345 wrpr %g0, 0x0, %tl
346
347661: nop
348 .section .sun4v_1insn_patch, "ax"
349 .word 661b
350 SET_GL(0)
351 .previous
352
353 wrpr %g0, RTRAP_PSTATE, %pstate
354
355 mov %l1, %g6
356 ldx [%g6 + TI_TASK], %g4
357 LOAD_PER_CPU_BASE(%g5, %g6, %g1, %g2, %g3)
358 call do_sparc64_fault
359 add %sp, PTREGS_OFF, %o0
360 ba,pt %xcc, rtrap
361 nop
362
363user_rtt_pre_restore:
364 add %g1, 1, %g1
365 wrpr %g1, 0x0, %cwp
366
367user_rtt_restore:
368 restore
369 rdpr %canrestore, %g1
370 wrpr %g1, 0x0, %cleanwin
371 retry
372 nop
373
374kern_rtt: rdpr %canrestore, %g1
375 brz,pn %g1, kern_rtt_fill
376 nop
377kern_rtt_restore:
378 stw %g0, [%sp + PTREGS_OFF + PT_V9_MAGIC]
379 restore
380 retry
381
382to_kernel:
383#ifdef CONFIG_PREEMPT
384 ldsw [%g6 + TI_PRE_COUNT], %l5
385 brnz %l5, kern_fpucheck
386 ldx [%g6 + TI_FLAGS], %l5
387 andcc %l5, _TIF_NEED_RESCHED, %g0
388 be,pt %xcc, kern_fpucheck
389 nop
390 cmp %l4, 0
391 bne,pn %xcc, kern_fpucheck
392 sethi %hi(PREEMPT_ACTIVE), %l6
393 stw %l6, [%g6 + TI_PRE_COUNT]
394 call schedule
395 nop
396 ba,pt %xcc, rtrap
397 stw %g0, [%g6 + TI_PRE_COUNT]
398#endif
399kern_fpucheck: ldub [%g6 + TI_FPDEPTH], %l5
400 brz,pt %l5, rt_continue
401 srl %l5, 1, %o0
402 add %g6, TI_FPSAVED, %l6
403 ldub [%l6 + %o0], %l2
404 sub %l5, 2, %l5
405
406 add %g6, TI_GSR, %o1
407 andcc %l2, (FPRS_FEF|FPRS_DU), %g0
408 be,pt %icc, 2f
409 and %l2, FPRS_DL, %l6
410 andcc %l2, FPRS_FEF, %g0
411 be,pn %icc, 5f
412 sll %o0, 3, %o5
413 rd %fprs, %g1
414
415 wr %g1, FPRS_FEF, %fprs
416 ldx [%o1 + %o5], %g1
417 add %g6, TI_XFSR, %o1
418 sll %o0, 8, %o2
419 add %g6, TI_FPREGS, %o3
420 brz,pn %l6, 1f
421 add %g6, TI_FPREGS+0x40, %o4
422
423 membar #Sync
424 ldda [%o3 + %o2] ASI_BLK_P, %f0
425 ldda [%o4 + %o2] ASI_BLK_P, %f16
426 membar #Sync
4271: andcc %l2, FPRS_DU, %g0
428 be,pn %icc, 1f
429 wr %g1, 0, %gsr
430 add %o2, 0x80, %o2
431 membar #Sync
432 ldda [%o3 + %o2] ASI_BLK_P, %f32
433 ldda [%o4 + %o2] ASI_BLK_P, %f48
4341: membar #Sync
435 ldx [%o1 + %o5], %fsr
4362: stb %l5, [%g6 + TI_FPDEPTH]
437 ba,pt %xcc, rt_continue
438 nop
4395: wr %g0, FPRS_FEF, %fprs
440 sll %o0, 8, %o2
441
442 add %g6, TI_FPREGS+0x80, %o3
443 add %g6, TI_FPREGS+0xc0, %o4
444 membar #Sync
445 ldda [%o3 + %o2] ASI_BLK_P, %f32
446 ldda [%o4 + %o2] ASI_BLK_P, %f48
447 membar #Sync
448 wr %g0, FPRS_DU, %fprs
449 ba,pt %xcc, rt_continue
450 stb %l5, [%g6 + TI_FPDEPTH]
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