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Add linux-next specific files for 20110831
[linux-2.6/next.git] / arch / powerpc / include / asm / exception-64s.h
blob8057f4f6980ffc55abfa0a20d366cf8e10a65b4b
1 #ifndef _ASM_POWERPC_EXCEPTION_H
2 #define _ASM_POWERPC_EXCEPTION_H
3 /*
4 * Extracted from head_64.S
5 *
6 * PowerPC version
7 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
8 *
9 * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
10 * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
11 * Adapted for Power Macintosh by Paul Mackerras.
12 * Low-level exception handlers and MMU support
13 * rewritten by Paul Mackerras.
14 * Copyright (C) 1996 Paul Mackerras.
15 *
16 * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
17 * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
18 *
19 * This file contains the low-level support and setup for the
20 * PowerPC-64 platform, including trap and interrupt dispatch.
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
26 */
27 /*
28 * The following macros define the code that appears as
29 * the prologue to each of the exception handlers. They
30 * are split into two parts to allow a single kernel binary
31 * to be used for pSeries and iSeries.
32 *
33 * We make as much of the exception code common between native
34 * exception handlers (including pSeries LPAR) and iSeries LPAR
35 * implementations as possible.
36 */
37
38 #define EX_R9 0
39 #define EX_R10 8
40 #define EX_R11 16
41 #define EX_R12 24
42 #define EX_R13 32
43 #define EX_SRR0 40
44 #define EX_DAR 48
45 #define EX_DSISR 56
46 #define EX_CCR 60
47 #define EX_R3 64
48 #define EX_LR 72
49 #define EX_CFAR 80
50
51 /*
52 * We're short on space and time in the exception prolog, so we can't
53 * use the normal SET_REG_IMMEDIATE macro. Normally we just need the
54 * low halfword of the address, but for Kdump we need the whole low
55 * word.
56 */
57 #define LOAD_HANDLER(reg, label) \
58 addi reg,reg,(label)-_stext; /* virt addr of handler ... */
59
60 /* Exception register prefixes */
61 #define EXC_HV H
62 #define EXC_STD
63
64 #define __EXCEPTION_PROLOG_1(area, extra, vec) \
65 GET_PACA(r13); \
66 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
67 std r10,area+EX_R10(r13); \
68 BEGIN_FTR_SECTION_NESTED(66); \
69 mfspr r10,SPRN_CFAR; \
70 std r10,area+EX_CFAR(r13); \
71 END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \
72 mfcr r9; \
73 extra(vec); \
74 std r11,area+EX_R11(r13); \
75 std r12,area+EX_R12(r13); \
76 GET_SCRATCH0(r10); \
77 std r10,area+EX_R13(r13)
78 #define EXCEPTION_PROLOG_1(area, extra, vec) \
79 __EXCEPTION_PROLOG_1(area, extra, vec)
80
81 #define __EXCEPTION_PROLOG_PSERIES_1(label, h) \
82 ld r12,PACAKBASE(r13); /* get high part of &label */ \
83 ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \
84 mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
85 LOAD_HANDLER(r12,label) \
86 mtspr SPRN_##h##SRR0,r12; \
87 mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
88 mtspr SPRN_##h##SRR1,r10; \
89 h##rfid; \
90 b . /* prevent speculative execution */
91 #define EXCEPTION_PROLOG_PSERIES_1(label, h) \
92 __EXCEPTION_PROLOG_PSERIES_1(label, h)
93
94 #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec) \
95 EXCEPTION_PROLOG_1(area, extra, vec); \
96 EXCEPTION_PROLOG_PSERIES_1(label, h);
97
98 #define __KVMTEST(n) \
99 lbz r10,HSTATE_IN_GUEST(r13); \
100 cmpwi r10,0; \
101 bne do_kvm_##n
102
103 #define __KVM_HANDLER(area, h, n) \
104 do_kvm_##n: \
105 ld r10,area+EX_R10(r13); \
106 stw r9,HSTATE_SCRATCH1(r13); \
107 ld r9,area+EX_R9(r13); \
108 std r12,HSTATE_SCRATCH0(r13); \
109 li r12,n; \
110 b kvmppc_interrupt
111
112 #define __KVM_HANDLER_SKIP(area, h, n) \
113 do_kvm_##n: \
114 cmpwi r10,KVM_GUEST_MODE_SKIP; \
115 ld r10,area+EX_R10(r13); \
116 beq 89f; \
117 stw r9,HSTATE_SCRATCH1(r13); \
118 ld r9,area+EX_R9(r13); \
119 std r12,HSTATE_SCRATCH0(r13); \
120 li r12,n; \
121 b kvmppc_interrupt; \
122 89: mtocrf 0x80,r9; \
123 ld r9,area+EX_R9(r13); \
124 b kvmppc_skip_##h##interrupt
125
126 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
127 #define KVMTEST(n) __KVMTEST(n)
128 #define KVM_HANDLER(area, h, n) __KVM_HANDLER(area, h, n)
129 #define KVM_HANDLER_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n)
130
131 #else
132 #define KVMTEST(n)
133 #define KVM_HANDLER(area, h, n)
134 #define KVM_HANDLER_SKIP(area, h, n)
135 #endif
136
137 #ifdef CONFIG_KVM_BOOK3S_PR
138 #define KVMTEST_PR(n) __KVMTEST(n)
139 #define KVM_HANDLER_PR(area, h, n) __KVM_HANDLER(area, h, n)
140 #define KVM_HANDLER_PR_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n)
141
142 #else
143 #define KVMTEST_PR(n)
144 #define KVM_HANDLER_PR(area, h, n)
145 #define KVM_HANDLER_PR_SKIP(area, h, n)
146 #endif
147
148 #define NOTEST(n)
149
150 /*
151 * The common exception prolog is used for all except a few exceptions
152 * such as a segment miss on a kernel address. We have to be prepared
153 * to take another exception from the point where we first touch the
154 * kernel stack onwards.
155 *
156 * On entry r13 points to the paca, r9-r13 are saved in the paca,
157 * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
158 * SRR1, and relocation is on.
159 */
160 #define EXCEPTION_PROLOG_COMMON(n, area) \
161 andi. r10,r12,MSR_PR; /* See if coming from user */ \
162 mr r10,r1; /* Save r1 */ \
163 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
164 beq- 1f; \
165 ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
166 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \
167 blt+ cr1,3f; /* abort if it is */ \
168 li r1,(n); /* will be reloaded later */ \
169 sth r1,PACA_TRAP_SAVE(r13); \
170 std r3,area+EX_R3(r13); \
171 addi r3,r13,area; /* r3 -> where regs are saved*/ \
172 b bad_stack; \
173 3: std r9,_CCR(r1); /* save CR in stackframe */ \
174 std r11,_NIP(r1); /* save SRR0 in stackframe */ \
175 std r12,_MSR(r1); /* save SRR1 in stackframe */ \
176 std r10,0(r1); /* make stack chain pointer */ \
177 std r0,GPR0(r1); /* save r0 in stackframe */ \
178 std r10,GPR1(r1); /* save r1 in stackframe */ \
179 ACCOUNT_CPU_USER_ENTRY(r9, r10); \
180 std r2,GPR2(r1); /* save r2 in stackframe */ \
181 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
182 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
183 ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \
184 ld r10,area+EX_R10(r13); \
185 std r9,GPR9(r1); \
186 std r10,GPR10(r1); \
187 ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \
188 ld r10,area+EX_R12(r13); \
189 ld r11,area+EX_R13(r13); \
190 std r9,GPR11(r1); \
191 std r10,GPR12(r1); \
192 std r11,GPR13(r1); \
193 BEGIN_FTR_SECTION_NESTED(66); \
194 ld r10,area+EX_CFAR(r13); \
195 std r10,ORIG_GPR3(r1); \
196 END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \
197 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
198 mflr r9; /* save LR in stackframe */ \
199 std r9,_LINK(r1); \
200 mfctr r10; /* save CTR in stackframe */ \
201 std r10,_CTR(r1); \
202 lbz r10,PACASOFTIRQEN(r13); \
203 mfspr r11,SPRN_XER; /* save XER in stackframe */ \
204 std r10,SOFTE(r1); \
205 std r11,_XER(r1); \
206 li r9,(n)+1; \
207 std r9,_TRAP(r1); /* set trap number */ \
208 li r10,0; \
209 ld r11,exception_marker@toc(r2); \
210 std r10,RESULT(r1); /* clear regs->result */ \
211 std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ \
212 ACCOUNT_STOLEN_TIME
213
214 /*
215 * Exception vectors.
216 */
217 #define STD_EXCEPTION_PSERIES(loc, vec, label) \
218 . = loc; \
219 .globl label##_pSeries; \
220 label##_pSeries: \
221 HMT_MEDIUM; \
222 SET_SCRATCH0(r13); /* save r13 */ \
223 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
224 EXC_STD, KVMTEST_PR, vec)
225
226 #define STD_EXCEPTION_HV(loc, vec, label) \
227 . = loc; \
228 .globl label##_hv; \
229 label##_hv: \
230 HMT_MEDIUM; \
231 SET_SCRATCH0(r13); /* save r13 */ \
232 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
233 EXC_HV, KVMTEST, vec)
234
235 #define __SOFTEN_TEST(h) \
236 lbz r10,PACASOFTIRQEN(r13); \
237 cmpwi r10,0; \
238 beq masked_##h##interrupt
239 #define _SOFTEN_TEST(h) __SOFTEN_TEST(h)
240
241 #define SOFTEN_TEST_PR(vec) \
242 KVMTEST_PR(vec); \
243 _SOFTEN_TEST(EXC_STD)
244
245 #define SOFTEN_TEST_HV(vec) \
246 KVMTEST(vec); \
247 _SOFTEN_TEST(EXC_HV)
248
249 #define SOFTEN_TEST_HV_201(vec) \
250 KVMTEST(vec); \
251 _SOFTEN_TEST(EXC_STD)
252
253 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
254 HMT_MEDIUM; \
255 SET_SCRATCH0(r13); /* save r13 */ \
256 __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
257 EXCEPTION_PROLOG_PSERIES_1(label##_common, h);
258 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
259 __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
260
261 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label) \
262 . = loc; \
263 .globl label##_pSeries; \
264 label##_pSeries: \
265 _MASKABLE_EXCEPTION_PSERIES(vec, label, \
266 EXC_STD, SOFTEN_TEST_PR)
267
268 #define MASKABLE_EXCEPTION_HV(loc, vec, label) \
269 . = loc; \
270 .globl label##_hv; \
271 label##_hv: \
272 _MASKABLE_EXCEPTION_PSERIES(vec, label, \
273 EXC_HV, SOFTEN_TEST_HV)
274
275 #ifdef CONFIG_PPC_ISERIES
276 #define DISABLE_INTS \
277 li r11,0; \
278 stb r11,PACASOFTIRQEN(r13); \
279 BEGIN_FW_FTR_SECTION; \
280 stb r11,PACAHARDIRQEN(r13); \
281 END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES); \
282 TRACE_DISABLE_INTS; \
283 BEGIN_FW_FTR_SECTION; \
284 mfmsr r10; \
285 ori r10,r10,MSR_EE; \
286 mtmsrd r10,1; \
287 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
288 #else
289 #define DISABLE_INTS \
290 li r11,0; \
291 stb r11,PACASOFTIRQEN(r13); \
292 stb r11,PACAHARDIRQEN(r13); \
293 TRACE_DISABLE_INTS
294 #endif /* CONFIG_PPC_ISERIES */
295
296 #define ENABLE_INTS \
297 ld r12,_MSR(r1); \
298 mfmsr r11; \
299 rlwimi r11,r12,0,MSR_EE; \
300 mtmsrd r11,1
301
302 #define STD_EXCEPTION_COMMON(trap, label, hdlr) \
303 .align 7; \
304 .globl label##_common; \
305 label##_common: \
306 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
307 DISABLE_INTS; \
308 bl .save_nvgprs; \
309 addi r3,r1,STACK_FRAME_OVERHEAD; \
310 bl hdlr; \
311 b .ret_from_except
312
313 /*
314 * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
315 * in the idle task and therefore need the special idle handling.
316 */
317 #define STD_EXCEPTION_COMMON_IDLE(trap, label, hdlr) \
318 .align 7; \
319 .globl label##_common; \
320 label##_common: \
321 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
322 FINISH_NAP; \
323 DISABLE_INTS; \
324 bl .save_nvgprs; \
325 addi r3,r1,STACK_FRAME_OVERHEAD; \
326 bl hdlr; \
327 b .ret_from_except
328
329 #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \
330 .align 7; \
331 .globl label##_common; \
332 label##_common: \
333 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
334 FINISH_NAP; \
335 DISABLE_INTS; \
336 BEGIN_FTR_SECTION \
337 bl .ppc64_runlatch_on; \
338 END_FTR_SECTION_IFSET(CPU_FTR_CTRL) \
339 addi r3,r1,STACK_FRAME_OVERHEAD; \
340 bl hdlr; \
341 b .ret_from_except_lite
342
343 /*
344 * When the idle code in power4_idle puts the CPU into NAP mode,
345 * it has to do so in a loop, and relies on the external interrupt
346 * and decrementer interrupt entry code to get it out of the loop.
347 * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
348 * to signal that it is in the loop and needs help to get out.
349 */
350 #ifdef CONFIG_PPC_970_NAP
351 #define FINISH_NAP \
352 BEGIN_FTR_SECTION \
353 clrrdi r11,r1,THREAD_SHIFT; \
354 ld r9,TI_LOCAL_FLAGS(r11); \
355 andi. r10,r9,_TLF_NAPPING; \
356 bnel power4_fixup_nap; \
357 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
358 #else
359 #define FINISH_NAP
360 #endif
361
362 #endif /* _ASM_POWERPC_EXCEPTION_H */
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