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-rw-r--r--arch/sparc64/kernel/etrap.S301
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1/* $Id: etrap.S,v 1.46 2002/02/09 19:49:30 davem Exp $
2 * etrap.S: Preparing for entry into the kernel on Sparc V9.
3 *
4 * Copyright (C) 1996, 1997 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz)
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/page.h>
14#include <asm/spitfire.h>
15#include <asm/head.h>
16#include <asm/processor.h>
17#include <asm/mmu.h>
18
19#define TASK_REGOFF (THREAD_SIZE-TRACEREG_SZ-STACKFRAME_SZ)
20#define ETRAP_PSTATE1 (PSTATE_RMO | PSTATE_PRIV)
21#define ETRAP_PSTATE2 \
22 (PSTATE_RMO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE)
23
24/*
25 * On entry, %g7 is return address - 0x4.
26 * %g4 and %g5 will be preserved %l4 and %l5 respectively.
27 */
28
29 .text
30 .align 64
31 .globl etrap, etrap_irq, etraptl1
32etrap: rdpr %pil, %g2
33etrap_irq:
34 rdpr %tstate, %g1
35 sllx %g2, 20, %g3
36 andcc %g1, TSTATE_PRIV, %g0
37 or %g1, %g3, %g1
38 bne,pn %xcc, 1f
39 sub %sp, STACKFRAME_SZ+TRACEREG_SZ-STACK_BIAS, %g2
40 wrpr %g0, 7, %cleanwin
41
42 sethi %hi(TASK_REGOFF), %g2
43 sethi %hi(TSTATE_PEF), %g3
44 or %g2, %lo(TASK_REGOFF), %g2
45 and %g1, %g3, %g3
46 brnz,pn %g3, 1f
47 add %g6, %g2, %g2
48 wr %g0, 0, %fprs
491: rdpr %tpc, %g3
50
51 stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TSTATE]
52 rdpr %tnpc, %g1
53 stx %g3, [%g2 + STACKFRAME_SZ + PT_V9_TPC]
54 rd %y, %g3
55 stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TNPC]
56 st %g3, [%g2 + STACKFRAME_SZ + PT_V9_Y]
57 save %g2, -STACK_BIAS, %sp ! Ordering here is critical
58 mov %g6, %l6
59
60 bne,pn %xcc, 3f
61 mov PRIMARY_CONTEXT, %l4
62 rdpr %canrestore, %g3
63 rdpr %wstate, %g2
64 wrpr %g0, 0, %canrestore
65 sll %g2, 3, %g2
66 mov 1, %l5
67 stb %l5, [%l6 + TI_FPDEPTH]
68
69 wrpr %g3, 0, %otherwin
70 wrpr %g2, 0, %wstate
71cplus_etrap_insn_1:
72 sethi %hi(0), %g3
73 sllx %g3, 32, %g3
74cplus_etrap_insn_2:
75 sethi %hi(0), %g2
76 or %g3, %g2, %g3
77 stxa %g3, [%l4] ASI_DMMU
78 flush %l6
79 wr %g0, ASI_AIUS, %asi
802: wrpr %g0, 0x0, %tl
81 mov %g4, %l4
82 mov %g5, %l5
83
84 mov %g7, %l2
85 wrpr %g0, ETRAP_PSTATE1, %pstate
86 stx %g1, [%sp + PTREGS_OFF + PT_V9_G1]
87 stx %g2, [%sp + PTREGS_OFF + PT_V9_G2]
88 stx %g3, [%sp + PTREGS_OFF + PT_V9_G3]
89 stx %g4, [%sp + PTREGS_OFF + PT_V9_G4]
90 stx %g5, [%sp + PTREGS_OFF + PT_V9_G5]
91 stx %g6, [%sp + PTREGS_OFF + PT_V9_G6]
92
93 stx %g7, [%sp + PTREGS_OFF + PT_V9_G7]
94 stx %i0, [%sp + PTREGS_OFF + PT_V9_I0]
95 stx %i1, [%sp + PTREGS_OFF + PT_V9_I1]
96 stx %i2, [%sp + PTREGS_OFF + PT_V9_I2]
97 stx %i3, [%sp + PTREGS_OFF + PT_V9_I3]
98 stx %i4, [%sp + PTREGS_OFF + PT_V9_I4]
99 stx %i5, [%sp + PTREGS_OFF + PT_V9_I5]
100
101 stx %i6, [%sp + PTREGS_OFF + PT_V9_I6]
102 stx %i7, [%sp + PTREGS_OFF + PT_V9_I7]
103 wrpr %g0, ETRAP_PSTATE2, %pstate
104 mov %l6, %g6
105#ifdef CONFIG_SMP
106 mov TSB_REG, %g3
107 ldxa [%g3] ASI_IMMU, %g5
108#endif
109 jmpl %l2 + 0x4, %g0
110 ldx [%g6 + TI_TASK], %g4
111
1123: ldub [%l6 + TI_FPDEPTH], %l5
113 add %l6, TI_FPSAVED + 1, %l4
114 srl %l5, 1, %l3
115 add %l5, 2, %l5
116 stb %l5, [%l6 + TI_FPDEPTH]
117 ba,pt %xcc, 2b
118 stb %g0, [%l4 + %l3]
119 nop
120
121etraptl1: /* Save tstate/tpc/tnpc of TL 1-->4 and the tl register itself.
122 * We place this right after pt_regs on the trap stack.
123 * The layout is:
124 * 0x00 TL1's TSTATE
125 * 0x08 TL1's TPC
126 * 0x10 TL1's TNPC
127 * 0x18 TL1's TT
128 * ...
129 * 0x58 TL4's TT
130 * 0x60 TL
131 */
132 sub %sp, ((4 * 8) * 4) + 8, %g2
133 rdpr %tl, %g1
134
135 wrpr %g0, 1, %tl
136 rdpr %tstate, %g3
137 stx %g3, [%g2 + STACK_BIAS + 0x00]
138 rdpr %tpc, %g3
139 stx %g3, [%g2 + STACK_BIAS + 0x08]
140 rdpr %tnpc, %g3
141 stx %g3, [%g2 + STACK_BIAS + 0x10]
142 rdpr %tt, %g3
143 stx %g3, [%g2 + STACK_BIAS + 0x18]
144
145 wrpr %g0, 2, %tl
146 rdpr %tstate, %g3
147 stx %g3, [%g2 + STACK_BIAS + 0x20]
148 rdpr %tpc, %g3
149 stx %g3, [%g2 + STACK_BIAS + 0x28]
150 rdpr %tnpc, %g3
151 stx %g3, [%g2 + STACK_BIAS + 0x30]
152 rdpr %tt, %g3
153 stx %g3, [%g2 + STACK_BIAS + 0x38]
154
155 wrpr %g0, 3, %tl
156 rdpr %tstate, %g3
157 stx %g3, [%g2 + STACK_BIAS + 0x40]
158 rdpr %tpc, %g3
159 stx %g3, [%g2 + STACK_BIAS + 0x48]
160 rdpr %tnpc, %g3
161 stx %g3, [%g2 + STACK_BIAS + 0x50]
162 rdpr %tt, %g3
163 stx %g3, [%g2 + STACK_BIAS + 0x58]
164
165 wrpr %g0, 4, %tl
166 rdpr %tstate, %g3
167 stx %g3, [%g2 + STACK_BIAS + 0x60]
168 rdpr %tpc, %g3
169 stx %g3, [%g2 + STACK_BIAS + 0x68]
170 rdpr %tnpc, %g3
171 stx %g3, [%g2 + STACK_BIAS + 0x70]
172 rdpr %tt, %g3
173 stx %g3, [%g2 + STACK_BIAS + 0x78]
174
175 wrpr %g1, %tl
176 stx %g1, [%g2 + STACK_BIAS + 0x80]
177
178 rdpr %tstate, %g1
179 sub %g2, STACKFRAME_SZ + TRACEREG_SZ - STACK_BIAS, %g2
180 ba,pt %xcc, 1b
181 andcc %g1, TSTATE_PRIV, %g0
182
183 .align 64
184 .globl scetrap
185scetrap: rdpr %pil, %g2
186 rdpr %tstate, %g1
187 sllx %g2, 20, %g3
188 andcc %g1, TSTATE_PRIV, %g0
189 or %g1, %g3, %g1
190 bne,pn %xcc, 1f
191 sub %sp, (STACKFRAME_SZ+TRACEREG_SZ-STACK_BIAS), %g2
192 wrpr %g0, 7, %cleanwin
193
194 sllx %g1, 51, %g3
195 sethi %hi(TASK_REGOFF), %g2
196 or %g2, %lo(TASK_REGOFF), %g2
197 brlz,pn %g3, 1f
198 add %g6, %g2, %g2
199 wr %g0, 0, %fprs
2001: rdpr %tpc, %g3
201 stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TSTATE]
202
203 rdpr %tnpc, %g1
204 stx %g3, [%g2 + STACKFRAME_SZ + PT_V9_TPC]
205 stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TNPC]
206 save %g2, -STACK_BIAS, %sp ! Ordering here is critical
207 mov %g6, %l6
208 bne,pn %xcc, 2f
209 mov ASI_P, %l7
210 rdpr %canrestore, %g3
211
212 rdpr %wstate, %g2
213 wrpr %g0, 0, %canrestore
214 sll %g2, 3, %g2
215 mov PRIMARY_CONTEXT, %l4
216 wrpr %g3, 0, %otherwin
217 wrpr %g2, 0, %wstate
218cplus_etrap_insn_3:
219 sethi %hi(0), %g3
220 sllx %g3, 32, %g3
221cplus_etrap_insn_4:
222 sethi %hi(0), %g2
223 or %g3, %g2, %g3
224 stxa %g3, [%l4] ASI_DMMU
225 flush %l6
226
227 mov ASI_AIUS, %l7
2282: mov %g4, %l4
229 mov %g5, %l5
230 add %g7, 0x4, %l2
231 wrpr %g0, ETRAP_PSTATE1, %pstate
232 stx %g1, [%sp + PTREGS_OFF + PT_V9_G1]
233 stx %g2, [%sp + PTREGS_OFF + PT_V9_G2]
234 sllx %l7, 24, %l7
235
236 stx %g3, [%sp + PTREGS_OFF + PT_V9_G3]
237 rdpr %cwp, %l0
238 stx %g4, [%sp + PTREGS_OFF + PT_V9_G4]
239 stx %g5, [%sp + PTREGS_OFF + PT_V9_G5]
240 stx %g6, [%sp + PTREGS_OFF + PT_V9_G6]
241 stx %g7, [%sp + PTREGS_OFF + PT_V9_G7]
242 or %l7, %l0, %l7
243 sethi %hi(TSTATE_RMO | TSTATE_PEF), %l0
244
245 or %l7, %l0, %l7
246 wrpr %l2, %tnpc
247 wrpr %l7, (TSTATE_PRIV | TSTATE_IE), %tstate
248 stx %i0, [%sp + PTREGS_OFF + PT_V9_I0]
249 stx %i1, [%sp + PTREGS_OFF + PT_V9_I1]
250 stx %i2, [%sp + PTREGS_OFF + PT_V9_I2]
251 stx %i3, [%sp + PTREGS_OFF + PT_V9_I3]
252 stx %i4, [%sp + PTREGS_OFF + PT_V9_I4]
253
254 stx %i5, [%sp + PTREGS_OFF + PT_V9_I5]
255 stx %i6, [%sp + PTREGS_OFF + PT_V9_I6]
256 mov %l6, %g6
257 stx %i7, [%sp + PTREGS_OFF + PT_V9_I7]
258#ifdef CONFIG_SMP
259 mov TSB_REG, %g3
260 ldxa [%g3] ASI_IMMU, %g5
261#endif
262 ldx [%g6 + TI_TASK], %g4
263 done
264
265#undef TASK_REGOFF
266#undef ETRAP_PSTATE1
267
268cplus_einsn_1:
269 sethi %uhi(CTX_CHEETAH_PLUS_NUC), %g3
270cplus_einsn_2:
271 sethi %hi(CTX_CHEETAH_PLUS_CTX0), %g2
272
273 .globl cheetah_plus_patch_etrap
274cheetah_plus_patch_etrap:
275 /* We configure the dTLB512_0 for 4MB pages and the
276 * dTLB512_1 for 8K pages when in context zero.
277 */
278 sethi %hi(cplus_einsn_1), %o0
279 sethi %hi(cplus_etrap_insn_1), %o2
280 lduw [%o0 + %lo(cplus_einsn_1)], %o1
281 or %o2, %lo(cplus_etrap_insn_1), %o2
282 stw %o1, [%o2]
283 flush %o2
284 sethi %hi(cplus_etrap_insn_3), %o2
285 or %o2, %lo(cplus_etrap_insn_3), %o2
286 stw %o1, [%o2]
287 flush %o2
288
289 sethi %hi(cplus_einsn_2), %o0
290 sethi %hi(cplus_etrap_insn_2), %o2
291 lduw [%o0 + %lo(cplus_einsn_2)], %o1
292 or %o2, %lo(cplus_etrap_insn_2), %o2
293 stw %o1, [%o2]
294 flush %o2
295 sethi %hi(cplus_etrap_insn_4), %o2
296 or %o2, %lo(cplus_etrap_insn_4), %o2
297 stw %o1, [%o2]
298 flush %o2
299
300 retl
301 nop
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