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1da177e4 LT |
1 | /* $Id: rtrap.S,v 1.61 2002/02/09 19:49:31 davem Exp $ |
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 | #include <linux/config.h> | |
9 | ||
10 | #include <asm/asi.h> | |
11 | #include <asm/pstate.h> | |
12 | #include <asm/ptrace.h> | |
13 | #include <asm/spitfire.h> | |
14 | #include <asm/head.h> | |
15 | #include <asm/visasm.h> | |
16 | #include <asm/processor.h> | |
17 | ||
18 | #define RTRAP_PSTATE (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE) | |
19 | #define RTRAP_PSTATE_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV) | |
20 | #define RTRAP_PSTATE_AG_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG) | |
21 | ||
22 | /* Register %l6 keeps track of whether we are returning | |
23 | * from a system call or not. It is cleared if we call | |
24 | * do_notify_resume, and it must not be otherwise modified | |
25 | * until we fully commit to returning to userspace. | |
26 | */ | |
27 | ||
28 | .text | |
29 | .align 32 | |
30 | __handle_softirq: | |
31 | call do_softirq | |
32 | nop | |
33 | ba,a,pt %xcc, __handle_softirq_continue | |
34 | nop | |
35 | __handle_preemption: | |
36 | call schedule | |
37 | wrpr %g0, RTRAP_PSTATE, %pstate | |
38 | ba,pt %xcc, __handle_preemption_continue | |
39 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate | |
40 | ||
41 | __handle_user_windows: | |
42 | call fault_in_user_windows | |
43 | wrpr %g0, RTRAP_PSTATE, %pstate | |
44 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate | |
45 | /* Redo sched+sig checks */ | |
46 | ldx [%g6 + TI_FLAGS], %l0 | |
47 | andcc %l0, _TIF_NEED_RESCHED, %g0 | |
48 | ||
49 | be,pt %xcc, 1f | |
50 | nop | |
51 | call schedule | |
52 | wrpr %g0, RTRAP_PSTATE, %pstate | |
53 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate | |
54 | ldx [%g6 + TI_FLAGS], %l0 | |
55 | ||
56 | 1: andcc %l0, (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING), %g0 | |
57 | be,pt %xcc, __handle_user_windows_continue | |
58 | nop | |
59 | clr %o0 | |
60 | mov %l5, %o2 | |
61 | mov %l6, %o3 | |
62 | add %sp, PTREGS_OFF, %o1 | |
63 | mov %l0, %o4 | |
64 | ||
65 | call do_notify_resume | |
66 | wrpr %g0, RTRAP_PSTATE, %pstate | |
67 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate | |
68 | clr %l6 | |
69 | /* Signal delivery can modify pt_regs tstate, so we must | |
70 | * reload it. | |
71 | */ | |
72 | ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 | |
73 | sethi %hi(0xf << 20), %l4 | |
74 | and %l1, %l4, %l4 | |
75 | ba,pt %xcc, __handle_user_windows_continue | |
76 | ||
77 | andn %l1, %l4, %l1 | |
78 | __handle_perfctrs: | |
79 | call update_perfctrs | |
80 | wrpr %g0, RTRAP_PSTATE, %pstate | |
81 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate | |
82 | ldub [%g6 + TI_WSAVED], %o2 | |
83 | brz,pt %o2, 1f | |
84 | nop | |
85 | /* Redo userwin+sched+sig checks */ | |
86 | call fault_in_user_windows | |
87 | ||
88 | wrpr %g0, RTRAP_PSTATE, %pstate | |
89 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate | |
90 | ldx [%g6 + TI_FLAGS], %l0 | |
91 | andcc %l0, _TIF_NEED_RESCHED, %g0 | |
92 | be,pt %xcc, 1f | |
93 | ||
94 | nop | |
95 | call schedule | |
96 | wrpr %g0, RTRAP_PSTATE, %pstate | |
97 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate | |
98 | ldx [%g6 + TI_FLAGS], %l0 | |
99 | 1: andcc %l0, (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING), %g0 | |
100 | ||
101 | be,pt %xcc, __handle_perfctrs_continue | |
102 | sethi %hi(TSTATE_PEF), %o0 | |
103 | clr %o0 | |
104 | mov %l5, %o2 | |
105 | mov %l6, %o3 | |
106 | add %sp, PTREGS_OFF, %o1 | |
107 | mov %l0, %o4 | |
108 | call do_notify_resume | |
109 | ||
110 | wrpr %g0, RTRAP_PSTATE, %pstate | |
111 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate | |
112 | clr %l6 | |
113 | /* Signal delivery can modify pt_regs tstate, so we must | |
114 | * reload it. | |
115 | */ | |
116 | ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 | |
117 | sethi %hi(0xf << 20), %l4 | |
118 | and %l1, %l4, %l4 | |
119 | andn %l1, %l4, %l1 | |
120 | ba,pt %xcc, __handle_perfctrs_continue | |
121 | ||
122 | sethi %hi(TSTATE_PEF), %o0 | |
123 | __handle_userfpu: | |
124 | rd %fprs, %l5 | |
125 | andcc %l5, FPRS_FEF, %g0 | |
126 | sethi %hi(TSTATE_PEF), %o0 | |
127 | be,a,pn %icc, __handle_userfpu_continue | |
128 | andn %l1, %o0, %l1 | |
129 | ba,a,pt %xcc, __handle_userfpu_continue | |
130 | ||
131 | __handle_signal: | |
132 | clr %o0 | |
133 | mov %l5, %o2 | |
134 | mov %l6, %o3 | |
135 | add %sp, PTREGS_OFF, %o1 | |
136 | mov %l0, %o4 | |
137 | call do_notify_resume | |
138 | wrpr %g0, RTRAP_PSTATE, %pstate | |
139 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate | |
140 | clr %l6 | |
141 | ||
142 | /* Signal delivery can modify pt_regs tstate, so we must | |
143 | * reload it. | |
144 | */ | |
145 | ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 | |
146 | sethi %hi(0xf << 20), %l4 | |
147 | and %l1, %l4, %l4 | |
148 | ba,pt %xcc, __handle_signal_continue | |
149 | andn %l1, %l4, %l1 | |
150 | ||
151 | .align 64 | |
152 | .globl rtrap_irq, rtrap_clr_l6, rtrap, irqsz_patchme, rtrap_xcall | |
153 | rtrap_irq: | |
154 | rtrap_clr_l6: clr %l6 | |
155 | rtrap: | |
156 | ldub [%g6 + TI_CPU], %l0 | |
157 | sethi %hi(irq_stat), %l2 ! &softirq_active | |
158 | or %l2, %lo(irq_stat), %l2 ! &softirq_active | |
159 | irqsz_patchme: sllx %l0, 0, %l0 | |
160 | lduw [%l2 + %l0], %l1 ! softirq_pending | |
161 | cmp %l1, 0 | |
162 | ||
163 | /* mm/ultra.S:xcall_report_regs KNOWS about this load. */ | |
164 | bne,pn %icc, __handle_softirq | |
165 | ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 | |
166 | __handle_softirq_continue: | |
167 | rtrap_xcall: | |
168 | sethi %hi(0xf << 20), %l4 | |
169 | andcc %l1, TSTATE_PRIV, %l3 | |
170 | and %l1, %l4, %l4 | |
171 | bne,pn %icc, to_kernel | |
172 | andn %l1, %l4, %l1 | |
173 | ||
174 | /* We must hold IRQs off and atomically test schedule+signal | |
175 | * state, then hold them off all the way back to userspace. | |
176 | * If we are returning to kernel, none of this matters. | |
177 | * | |
178 | * If we do not do this, there is a window where we would do | |
179 | * the tests, later the signal/resched event arrives but we do | |
180 | * not process it since we are still in kernel mode. It would | |
181 | * take until the next local IRQ before the signal/resched | |
182 | * event would be handled. | |
183 | * | |
184 | * This also means that if we have to deal with performance | |
185 | * counters or user windows, we have to redo all of these | |
186 | * sched+signal checks with IRQs disabled. | |
187 | */ | |
188 | to_user: wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate | |
189 | wrpr 0, %pil | |
190 | __handle_preemption_continue: | |
191 | ldx [%g6 + TI_FLAGS], %l0 | |
192 | sethi %hi(_TIF_USER_WORK_MASK), %o0 | |
193 | or %o0, %lo(_TIF_USER_WORK_MASK), %o0 | |
194 | andcc %l0, %o0, %g0 | |
195 | sethi %hi(TSTATE_PEF), %o0 | |
196 | be,pt %xcc, user_nowork | |
197 | andcc %l1, %o0, %g0 | |
198 | andcc %l0, _TIF_NEED_RESCHED, %g0 | |
199 | bne,pn %xcc, __handle_preemption | |
200 | andcc %l0, (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING), %g0 | |
201 | bne,pn %xcc, __handle_signal | |
202 | __handle_signal_continue: | |
203 | ldub [%g6 + TI_WSAVED], %o2 | |
204 | brnz,pn %o2, __handle_user_windows | |
205 | nop | |
206 | __handle_user_windows_continue: | |
207 | ldx [%g6 + TI_FLAGS], %l5 | |
208 | andcc %l5, _TIF_PERFCTR, %g0 | |
209 | sethi %hi(TSTATE_PEF), %o0 | |
210 | bne,pn %xcc, __handle_perfctrs | |
211 | __handle_perfctrs_continue: | |
212 | andcc %l1, %o0, %g0 | |
213 | ||
214 | /* This fpdepth clear is necessary for non-syscall rtraps only */ | |
215 | user_nowork: | |
216 | bne,pn %xcc, __handle_userfpu | |
217 | stb %g0, [%g6 + TI_FPDEPTH] | |
218 | __handle_userfpu_continue: | |
219 | ||
220 | rt_continue: ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1 | |
221 | ldx [%sp + PTREGS_OFF + PT_V9_G2], %g2 | |
222 | ||
223 | ldx [%sp + PTREGS_OFF + PT_V9_G3], %g3 | |
224 | ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4 | |
225 | ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5 | |
226 | mov TSB_REG, %g6 | |
227 | brnz,a,pn %l3, 1f | |
228 | ldxa [%g6] ASI_IMMU, %g5 | |
229 | 1: ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6 | |
230 | ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7 | |
231 | wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %pstate | |
232 | ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0 | |
233 | ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1 | |
234 | ||
235 | ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2 | |
236 | ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3 | |
237 | ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4 | |
238 | ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5 | |
239 | ldx [%sp + PTREGS_OFF + PT_V9_I6], %i6 | |
240 | ldx [%sp + PTREGS_OFF + PT_V9_I7], %i7 | |
241 | ldx [%sp + PTREGS_OFF + PT_V9_TPC], %l2 | |
242 | ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %o2 | |
243 | ||
244 | ld [%sp + PTREGS_OFF + PT_V9_Y], %o3 | |
245 | wr %o3, %g0, %y | |
246 | srl %l4, 20, %l4 | |
247 | wrpr %l4, 0x0, %pil | |
248 | wrpr %g0, 0x1, %tl | |
249 | wrpr %l1, %g0, %tstate | |
250 | wrpr %l2, %g0, %tpc | |
251 | wrpr %o2, %g0, %tnpc | |
252 | ||
253 | brnz,pn %l3, kern_rtt | |
254 | mov PRIMARY_CONTEXT, %l7 | |
255 | ldxa [%l7 + %l7] ASI_DMMU, %l0 | |
256 | cplus_rtrap_insn_1: | |
257 | sethi %hi(0), %l1 | |
258 | sllx %l1, 32, %l1 | |
259 | or %l0, %l1, %l0 | |
260 | stxa %l0, [%l7] ASI_DMMU | |
261 | flush %g6 | |
262 | rdpr %wstate, %l1 | |
263 | rdpr %otherwin, %l2 | |
264 | srl %l1, 3, %l1 | |
265 | ||
266 | wrpr %l2, %g0, %canrestore | |
267 | wrpr %l1, %g0, %wstate | |
268 | wrpr %g0, %g0, %otherwin | |
269 | restore | |
270 | rdpr %canrestore, %g1 | |
271 | wrpr %g1, 0x0, %cleanwin | |
272 | retry | |
273 | nop | |
274 | ||
275 | kern_rtt: restore | |
276 | retry | |
277 | to_kernel: | |
278 | #ifdef CONFIG_PREEMPT | |
279 | ldsw [%g6 + TI_PRE_COUNT], %l5 | |
280 | brnz %l5, kern_fpucheck | |
281 | ldx [%g6 + TI_FLAGS], %l5 | |
282 | andcc %l5, _TIF_NEED_RESCHED, %g0 | |
283 | be,pt %xcc, kern_fpucheck | |
284 | srl %l4, 20, %l5 | |
285 | cmp %l5, 0 | |
286 | bne,pn %xcc, kern_fpucheck | |
287 | sethi %hi(PREEMPT_ACTIVE), %l6 | |
288 | stw %l6, [%g6 + TI_PRE_COUNT] | |
289 | call schedule | |
290 | nop | |
291 | ba,pt %xcc, rtrap | |
292 | stw %g0, [%g6 + TI_PRE_COUNT] | |
293 | #endif | |
294 | kern_fpucheck: ldub [%g6 + TI_FPDEPTH], %l5 | |
295 | brz,pt %l5, rt_continue | |
296 | srl %l5, 1, %o0 | |
297 | add %g6, TI_FPSAVED, %l6 | |
298 | ldub [%l6 + %o0], %l2 | |
299 | sub %l5, 2, %l5 | |
300 | ||
301 | add %g6, TI_GSR, %o1 | |
302 | andcc %l2, (FPRS_FEF|FPRS_DU), %g0 | |
303 | be,pt %icc, 2f | |
304 | and %l2, FPRS_DL, %l6 | |
305 | andcc %l2, FPRS_FEF, %g0 | |
306 | be,pn %icc, 5f | |
307 | sll %o0, 3, %o5 | |
308 | rd %fprs, %g1 | |
309 | ||
310 | wr %g1, FPRS_FEF, %fprs | |
311 | ldx [%o1 + %o5], %g1 | |
312 | add %g6, TI_XFSR, %o1 | |
313 | membar #StoreLoad | #LoadLoad | |
314 | sll %o0, 8, %o2 | |
315 | add %g6, TI_FPREGS, %o3 | |
316 | brz,pn %l6, 1f | |
317 | add %g6, TI_FPREGS+0x40, %o4 | |
318 | ||
319 | ldda [%o3 + %o2] ASI_BLK_P, %f0 | |
320 | ldda [%o4 + %o2] ASI_BLK_P, %f16 | |
321 | 1: andcc %l2, FPRS_DU, %g0 | |
322 | be,pn %icc, 1f | |
323 | wr %g1, 0, %gsr | |
324 | add %o2, 0x80, %o2 | |
325 | ldda [%o3 + %o2] ASI_BLK_P, %f32 | |
326 | ldda [%o4 + %o2] ASI_BLK_P, %f48 | |
327 | ||
328 | 1: membar #Sync | |
329 | ldx [%o1 + %o5], %fsr | |
330 | 2: stb %l5, [%g6 + TI_FPDEPTH] | |
331 | ba,pt %xcc, rt_continue | |
332 | nop | |
333 | 5: wr %g0, FPRS_FEF, %fprs | |
334 | membar #StoreLoad | #LoadLoad | |
335 | sll %o0, 8, %o2 | |
336 | ||
337 | add %g6, TI_FPREGS+0x80, %o3 | |
338 | add %g6, TI_FPREGS+0xc0, %o4 | |
339 | ldda [%o3 + %o2] ASI_BLK_P, %f32 | |
340 | ldda [%o4 + %o2] ASI_BLK_P, %f48 | |
341 | membar #Sync | |
342 | wr %g0, FPRS_DU, %fprs | |
343 | ba,pt %xcc, rt_continue | |
344 | stb %l5, [%g6 + TI_FPDEPTH] | |
345 | ||
346 | cplus_rinsn_1: | |
347 | sethi %uhi(CTX_CHEETAH_PLUS_NUC), %l1 | |
348 | ||
349 | .globl cheetah_plus_patch_rtrap | |
350 | cheetah_plus_patch_rtrap: | |
351 | /* We configure the dTLB512_0 for 4MB pages and the | |
352 | * dTLB512_1 for 8K pages when in context zero. | |
353 | */ | |
354 | sethi %hi(cplus_rinsn_1), %o0 | |
355 | sethi %hi(cplus_rtrap_insn_1), %o2 | |
356 | lduw [%o0 + %lo(cplus_rinsn_1)], %o1 | |
357 | or %o2, %lo(cplus_rtrap_insn_1), %o2 | |
358 | stw %o1, [%o2] | |
359 | flush %o2 | |
360 | ||
361 | retl | |
362 | nop |