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Commit | Line | Data |
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9994a338 | 1 | /* |
9994a338 PM |
2 | * PowerPC version |
3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
4 | * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP | |
5 | * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> | |
6 | * Adapted for Power Macintosh by Paul Mackerras. | |
7 | * Low-level exception handlers and MMU support | |
8 | * rewritten by Paul Mackerras. | |
9 | * Copyright (C) 1996 Paul Mackerras. | |
10 | * MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@jlc.net). | |
11 | * | |
12 | * This file contains the system call entry code, context switch | |
13 | * code, and exception/interrupt return code for PowerPC. | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
19 | */ | |
20 | ||
9994a338 PM |
21 | #include <linux/errno.h> |
22 | #include <asm/unistd.h> | |
23 | #include <asm/processor.h> | |
24 | #include <asm/page.h> | |
25 | #include <asm/mmu.h> | |
26 | #include <asm/thread_info.h> | |
27 | #include <asm/ppc_asm.h> | |
28 | #include <asm/asm-offsets.h> | |
29 | #include <asm/cputable.h> | |
3f639ee8 | 30 | #include <asm/firmware.h> |
007d88d0 | 31 | #include <asm/bug.h> |
ec2b36b9 | 32 | #include <asm/ptrace.h> |
945feb17 | 33 | #include <asm/irqflags.h> |
395a59d0 | 34 | #include <asm/ftrace.h> |
7230c564 | 35 | #include <asm/hw_irq.h> |
5d1c5745 | 36 | #include <asm/context_tracking.h> |
9994a338 PM |
37 | |
38 | /* | |
39 | * System calls. | |
40 | */ | |
41 | .section ".toc","aw" | |
42 | .SYS_CALL_TABLE: | |
43 | .tc .sys_call_table[TC],.sys_call_table | |
44 | ||
45 | /* This value is used to mark exception frames on the stack. */ | |
46 | exception_marker: | |
ec2b36b9 | 47 | .tc ID_EXC_MARKER[TC],STACK_FRAME_REGS_MARKER |
9994a338 PM |
48 | |
49 | .section ".text" | |
50 | .align 7 | |
51 | ||
52 | #undef SHOW_SYSCALLS | |
53 | ||
54 | .globl system_call_common | |
55 | system_call_common: | |
56 | andi. r10,r12,MSR_PR | |
57 | mr r10,r1 | |
58 | addi r1,r1,-INT_FRAME_SIZE | |
59 | beq- 1f | |
60 | ld r1,PACAKSAVE(r13) | |
61 | 1: std r10,0(r1) | |
62 | std r11,_NIP(r1) | |
63 | std r12,_MSR(r1) | |
64 | std r0,GPR0(r1) | |
65 | std r10,GPR1(r1) | |
5d75b264 | 66 | beq 2f /* if from kernel mode */ |
c6622f63 | 67 | ACCOUNT_CPU_USER_ENTRY(r10, r11) |
5d75b264 | 68 | 2: std r2,GPR2(r1) |
9994a338 | 69 | std r3,GPR3(r1) |
fd6c40f3 | 70 | mfcr r2 |
9994a338 PM |
71 | std r4,GPR4(r1) |
72 | std r5,GPR5(r1) | |
73 | std r6,GPR6(r1) | |
74 | std r7,GPR7(r1) | |
75 | std r8,GPR8(r1) | |
76 | li r11,0 | |
77 | std r11,GPR9(r1) | |
78 | std r11,GPR10(r1) | |
79 | std r11,GPR11(r1) | |
80 | std r11,GPR12(r1) | |
823df435 | 81 | std r11,_XER(r1) |
82087414 | 82 | std r11,_CTR(r1) |
9994a338 | 83 | std r9,GPR13(r1) |
9994a338 | 84 | mflr r10 |
fd6c40f3 AB |
85 | /* |
86 | * This clears CR0.SO (bit 28), which is the error indication on | |
87 | * return from this system call. | |
88 | */ | |
89 | rldimi r2,r11,28,(63-28) | |
9994a338 | 90 | li r11,0xc01 |
9994a338 PM |
91 | std r10,_LINK(r1) |
92 | std r11,_TRAP(r1) | |
9994a338 | 93 | std r3,ORIG_GPR3(r1) |
fd6c40f3 | 94 | std r2,_CCR(r1) |
9994a338 PM |
95 | ld r2,PACATOC(r13) |
96 | addi r9,r1,STACK_FRAME_OVERHEAD | |
97 | ld r11,exception_marker@toc(r2) | |
98 | std r11,-16(r9) /* "regshere" marker */ | |
abf917cd | 99 | #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC_SPLPAR) |
cf9efce0 PM |
100 | BEGIN_FW_FTR_SECTION |
101 | beq 33f | |
102 | /* if from user, see if there are any DTL entries to process */ | |
103 | ld r10,PACALPPACAPTR(r13) /* get ptr to VPA */ | |
104 | ld r11,PACA_DTL_RIDX(r13) /* get log read index */ | |
7ffcf8ec AB |
105 | addi r10,r10,LPPACA_DTLIDX |
106 | LDX_BE r10,0,r10 /* get log write index */ | |
cf9efce0 PM |
107 | cmpd cr1,r11,r10 |
108 | beq+ cr1,33f | |
109 | bl .accumulate_stolen_time | |
110 | REST_GPR(0,r1) | |
111 | REST_4GPRS(3,r1) | |
112 | REST_2GPRS(7,r1) | |
113 | addi r9,r1,STACK_FRAME_OVERHEAD | |
114 | 33: | |
115 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR) | |
abf917cd | 116 | #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE && CONFIG_PPC_SPLPAR */ |
cf9efce0 | 117 | |
1421ae0b BH |
118 | /* |
119 | * A syscall should always be called with interrupts enabled | |
120 | * so we just unconditionally hard-enable here. When some kind | |
121 | * of irq tracing is used, we additionally check that condition | |
122 | * is correct | |
123 | */ | |
124 | #if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_BUG) | |
125 | lbz r10,PACASOFTIRQEN(r13) | |
126 | xori r10,r10,1 | |
127 | 1: tdnei r10,0 | |
128 | EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,BUGFLAG_WARNING | |
129 | #endif | |
2d27cfd3 | 130 | |
2d27cfd3 BH |
131 | #ifdef CONFIG_PPC_BOOK3E |
132 | wrteei 1 | |
133 | #else | |
1421ae0b | 134 | ld r11,PACAKMSR(r13) |
9994a338 PM |
135 | ori r11,r11,MSR_EE |
136 | mtmsrd r11,1 | |
2d27cfd3 | 137 | #endif /* CONFIG_PPC_BOOK3E */ |
9994a338 | 138 | |
1421ae0b BH |
139 | /* We do need to set SOFTE in the stack frame or the return |
140 | * from interrupt will be painful | |
141 | */ | |
142 | li r10,1 | |
143 | std r10,SOFTE(r1) | |
144 | ||
9994a338 PM |
145 | #ifdef SHOW_SYSCALLS |
146 | bl .do_show_syscall | |
147 | REST_GPR(0,r1) | |
148 | REST_4GPRS(3,r1) | |
149 | REST_2GPRS(7,r1) | |
150 | addi r9,r1,STACK_FRAME_OVERHEAD | |
151 | #endif | |
9778b696 | 152 | CURRENT_THREAD_INFO(r11, r1) |
9994a338 | 153 | ld r10,TI_FLAGS(r11) |
9994a338 | 154 | andi. r11,r10,_TIF_SYSCALL_T_OR_A |
2540334a | 155 | bne syscall_dotrace |
d14299de | 156 | .Lsyscall_dotrace_cont: |
9994a338 PM |
157 | cmpldi 0,r0,NR_syscalls |
158 | bge- syscall_enosys | |
159 | ||
160 | system_call: /* label this so stack traces look sane */ | |
161 | /* | |
162 | * Need to vector to 32 Bit or default sys_call_table here, | |
163 | * based on caller's run-mode / personality. | |
164 | */ | |
165 | ld r11,.SYS_CALL_TABLE@toc(2) | |
166 | andi. r10,r10,_TIF_32BIT | |
167 | beq 15f | |
168 | addi r11,r11,8 /* use 32-bit syscall entries */ | |
169 | clrldi r3,r3,32 | |
170 | clrldi r4,r4,32 | |
171 | clrldi r5,r5,32 | |
172 | clrldi r6,r6,32 | |
173 | clrldi r7,r7,32 | |
174 | clrldi r8,r8,32 | |
175 | 15: | |
176 | slwi r0,r0,4 | |
177 | ldx r10,r11,r0 /* Fetch system call handler [ptr] */ | |
178 | mtctr r10 | |
179 | bctrl /* Call handler */ | |
180 | ||
181 | syscall_exit: | |
401d1f02 | 182 | std r3,RESULT(r1) |
9994a338 | 183 | #ifdef SHOW_SYSCALLS |
9994a338 | 184 | bl .do_show_syscall_exit |
401d1f02 | 185 | ld r3,RESULT(r1) |
9994a338 | 186 | #endif |
9778b696 | 187 | CURRENT_THREAD_INFO(r12, r1) |
9994a338 | 188 | |
9994a338 | 189 | ld r8,_MSR(r1) |
2d27cfd3 BH |
190 | #ifdef CONFIG_PPC_BOOK3S |
191 | /* No MSR:RI on BookE */ | |
9994a338 PM |
192 | andi. r10,r8,MSR_RI |
193 | beq- unrecov_restore | |
2d27cfd3 | 194 | #endif |
1421ae0b BH |
195 | /* |
196 | * Disable interrupts so current_thread_info()->flags can't change, | |
2d27cfd3 BH |
197 | * and so that we don't get interrupted after loading SRR0/1. |
198 | */ | |
199 | #ifdef CONFIG_PPC_BOOK3E | |
200 | wrteei 0 | |
201 | #else | |
1421ae0b | 202 | ld r10,PACAKMSR(r13) |
ac1dc365 AB |
203 | /* |
204 | * For performance reasons we clear RI the same time that we | |
205 | * clear EE. We only need to clear RI just before we restore r13 | |
206 | * below, but batching it with EE saves us one expensive mtmsrd call. | |
207 | * We have to be careful to restore RI if we branch anywhere from | |
208 | * here (eg syscall_exit_work). | |
209 | */ | |
210 | li r9,MSR_RI | |
211 | andc r11,r10,r9 | |
212 | mtmsrd r11,1 | |
2d27cfd3 BH |
213 | #endif /* CONFIG_PPC_BOOK3E */ |
214 | ||
9994a338 | 215 | ld r9,TI_FLAGS(r12) |
401d1f02 | 216 | li r11,-_LAST_ERRNO |
1bd79336 | 217 | andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_USER_WORK_MASK|_TIF_PERSYSCALL_MASK) |
9994a338 | 218 | bne- syscall_exit_work |
401d1f02 DW |
219 | cmpld r3,r11 |
220 | ld r5,_CCR(r1) | |
221 | bge- syscall_error | |
d14299de | 222 | .Lsyscall_error_cont: |
9994a338 | 223 | ld r7,_NIP(r1) |
f89451fb | 224 | BEGIN_FTR_SECTION |
9994a338 | 225 | stdcx. r0,0,r1 /* to clear the reservation */ |
f89451fb | 226 | END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) |
9994a338 PM |
227 | andi. r6,r8,MSR_PR |
228 | ld r4,_LINK(r1) | |
2d27cfd3 | 229 | |
c6622f63 PM |
230 | beq- 1f |
231 | ACCOUNT_CPU_USER_EXIT(r11, r12) | |
44e9309f | 232 | HMT_MEDIUM_LOW_HAS_PPR |
c6622f63 | 233 | ld r13,GPR13(r1) /* only restore r13 if returning to usermode */ |
9994a338 | 234 | 1: ld r2,GPR2(r1) |
9994a338 PM |
235 | ld r1,GPR1(r1) |
236 | mtlr r4 | |
237 | mtcr r5 | |
238 | mtspr SPRN_SRR0,r7 | |
239 | mtspr SPRN_SRR1,r8 | |
2d27cfd3 | 240 | RFI |
9994a338 PM |
241 | b . /* prevent speculative execution */ |
242 | ||
401d1f02 | 243 | syscall_error: |
9994a338 | 244 | oris r5,r5,0x1000 /* Set SO bit in CR */ |
401d1f02 | 245 | neg r3,r3 |
9994a338 | 246 | std r5,_CCR(r1) |
d14299de | 247 | b .Lsyscall_error_cont |
401d1f02 | 248 | |
9994a338 PM |
249 | /* Traced system call support */ |
250 | syscall_dotrace: | |
251 | bl .save_nvgprs | |
252 | addi r3,r1,STACK_FRAME_OVERHEAD | |
253 | bl .do_syscall_trace_enter | |
4f72c427 RM |
254 | /* |
255 | * Restore argument registers possibly just changed. | |
256 | * We use the return value of do_syscall_trace_enter | |
257 | * for the call number to look up in the table (r0). | |
258 | */ | |
259 | mr r0,r3 | |
9994a338 PM |
260 | ld r3,GPR3(r1) |
261 | ld r4,GPR4(r1) | |
262 | ld r5,GPR5(r1) | |
263 | ld r6,GPR6(r1) | |
264 | ld r7,GPR7(r1) | |
265 | ld r8,GPR8(r1) | |
266 | addi r9,r1,STACK_FRAME_OVERHEAD | |
9778b696 | 267 | CURRENT_THREAD_INFO(r10, r1) |
9994a338 | 268 | ld r10,TI_FLAGS(r10) |
d14299de | 269 | b .Lsyscall_dotrace_cont |
9994a338 | 270 | |
401d1f02 DW |
271 | syscall_enosys: |
272 | li r3,-ENOSYS | |
273 | b syscall_exit | |
274 | ||
275 | syscall_exit_work: | |
ac1dc365 AB |
276 | #ifdef CONFIG_PPC_BOOK3S |
277 | mtmsrd r10,1 /* Restore RI */ | |
278 | #endif | |
401d1f02 DW |
279 | /* If TIF_RESTOREALL is set, don't scribble on either r3 or ccr. |
280 | If TIF_NOERROR is set, just save r3 as it is. */ | |
281 | ||
282 | andi. r0,r9,_TIF_RESTOREALL | |
1bd79336 PM |
283 | beq+ 0f |
284 | REST_NVGPRS(r1) | |
285 | b 2f | |
286 | 0: cmpld r3,r11 /* r10 is -LAST_ERRNO */ | |
401d1f02 DW |
287 | blt+ 1f |
288 | andi. r0,r9,_TIF_NOERROR | |
289 | bne- 1f | |
290 | ld r5,_CCR(r1) | |
291 | neg r3,r3 | |
292 | oris r5,r5,0x1000 /* Set SO bit in CR */ | |
293 | std r5,_CCR(r1) | |
294 | 1: std r3,GPR3(r1) | |
295 | 2: andi. r0,r9,(_TIF_PERSYSCALL_MASK) | |
296 | beq 4f | |
297 | ||
1bd79336 | 298 | /* Clear per-syscall TIF flags if any are set. */ |
401d1f02 DW |
299 | |
300 | li r11,_TIF_PERSYSCALL_MASK | |
301 | addi r12,r12,TI_FLAGS | |
302 | 3: ldarx r10,0,r12 | |
303 | andc r10,r10,r11 | |
304 | stdcx. r10,0,r12 | |
305 | bne- 3b | |
306 | subi r12,r12,TI_FLAGS | |
1bd79336 PM |
307 | |
308 | 4: /* Anything else left to do? */ | |
05e38e5d | 309 | SET_DEFAULT_THREAD_PPR(r3, r10) /* Set thread.ppr = 3 */ |
1bd79336 | 310 | andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP) |
401d1f02 DW |
311 | beq .ret_from_except_lite |
312 | ||
313 | /* Re-enable interrupts */ | |
2d27cfd3 BH |
314 | #ifdef CONFIG_PPC_BOOK3E |
315 | wrteei 1 | |
316 | #else | |
1421ae0b | 317 | ld r10,PACAKMSR(r13) |
401d1f02 DW |
318 | ori r10,r10,MSR_EE |
319 | mtmsrd r10,1 | |
2d27cfd3 | 320 | #endif /* CONFIG_PPC_BOOK3E */ |
401d1f02 | 321 | |
1bd79336 | 322 | bl .save_nvgprs |
9994a338 PM |
323 | addi r3,r1,STACK_FRAME_OVERHEAD |
324 | bl .do_syscall_trace_leave | |
1bd79336 | 325 | b .ret_from_except |
9994a338 PM |
326 | |
327 | /* Save non-volatile GPRs, if not already saved. */ | |
328 | _GLOBAL(save_nvgprs) | |
329 | ld r11,_TRAP(r1) | |
330 | andi. r0,r11,1 | |
331 | beqlr- | |
332 | SAVE_NVGPRS(r1) | |
333 | clrrdi r0,r11,1 | |
334 | std r0,_TRAP(r1) | |
335 | blr | |
336 | ||
401d1f02 | 337 | |
9994a338 PM |
338 | /* |
339 | * The sigsuspend and rt_sigsuspend system calls can call do_signal | |
340 | * and thus put the process into the stopped state where we might | |
341 | * want to examine its user state with ptrace. Therefore we need | |
342 | * to save all the nonvolatile registers (r14 - r31) before calling | |
343 | * the C code. Similarly, fork, vfork and clone need the full | |
344 | * register state on the stack so that it can be copied to the child. | |
345 | */ | |
9994a338 PM |
346 | |
347 | _GLOBAL(ppc_fork) | |
348 | bl .save_nvgprs | |
349 | bl .sys_fork | |
350 | b syscall_exit | |
351 | ||
352 | _GLOBAL(ppc_vfork) | |
353 | bl .save_nvgprs | |
354 | bl .sys_vfork | |
355 | b syscall_exit | |
356 | ||
357 | _GLOBAL(ppc_clone) | |
358 | bl .save_nvgprs | |
359 | bl .sys_clone | |
360 | b syscall_exit | |
361 | ||
1bd79336 PM |
362 | _GLOBAL(ppc32_swapcontext) |
363 | bl .save_nvgprs | |
364 | bl .compat_sys_swapcontext | |
365 | b syscall_exit | |
366 | ||
367 | _GLOBAL(ppc64_swapcontext) | |
368 | bl .save_nvgprs | |
369 | bl .sys_swapcontext | |
370 | b syscall_exit | |
371 | ||
9994a338 PM |
372 | _GLOBAL(ret_from_fork) |
373 | bl .schedule_tail | |
374 | REST_NVGPRS(r1) | |
375 | li r3,0 | |
376 | b syscall_exit | |
377 | ||
58254e10 AV |
378 | _GLOBAL(ret_from_kernel_thread) |
379 | bl .schedule_tail | |
380 | REST_NVGPRS(r1) | |
53b50f94 | 381 | ld r14, 0(r14) |
58254e10 AV |
382 | mtlr r14 |
383 | mr r3,r15 | |
384 | blrl | |
385 | li r3,0 | |
be6abfa7 AV |
386 | b syscall_exit |
387 | ||
71433285 AB |
388 | .section ".toc","aw" |
389 | DSCR_DEFAULT: | |
390 | .tc dscr_default[TC],dscr_default | |
391 | ||
392 | .section ".text" | |
393 | ||
9994a338 PM |
394 | /* |
395 | * This routine switches between two different tasks. The process | |
396 | * state of one is saved on its kernel stack. Then the state | |
397 | * of the other is restored from its kernel stack. The memory | |
398 | * management hardware is updated to the second process's state. | |
399 | * Finally, we can return to the second process, via ret_from_except. | |
400 | * On entry, r3 points to the THREAD for the current task, r4 | |
401 | * points to the THREAD for the new task. | |
402 | * | |
403 | * Note: there are two ways to get to the "going out" portion | |
404 | * of this code; either by coming in via the entry (_switch) | |
405 | * or via "fork" which must set up an environment equivalent | |
406 | * to the "_switch" path. If you change this you'll have to change | |
407 | * the fork code also. | |
408 | * | |
409 | * The code which creates the new task context is in 'copy_thread' | |
2ef9481e | 410 | * in arch/powerpc/kernel/process.c |
9994a338 PM |
411 | */ |
412 | .align 7 | |
413 | _GLOBAL(_switch) | |
414 | mflr r0 | |
415 | std r0,16(r1) | |
416 | stdu r1,-SWITCH_FRAME_SIZE(r1) | |
417 | /* r3-r13 are caller saved -- Cort */ | |
418 | SAVE_8GPRS(14, r1) | |
419 | SAVE_10GPRS(22, r1) | |
420 | mflr r20 /* Return to switch caller */ | |
421 | mfmsr r22 | |
422 | li r0, MSR_FP | |
ce48b210 MN |
423 | #ifdef CONFIG_VSX |
424 | BEGIN_FTR_SECTION | |
425 | oris r0,r0,MSR_VSX@h /* Disable VSX */ | |
426 | END_FTR_SECTION_IFSET(CPU_FTR_VSX) | |
427 | #endif /* CONFIG_VSX */ | |
9994a338 PM |
428 | #ifdef CONFIG_ALTIVEC |
429 | BEGIN_FTR_SECTION | |
430 | oris r0,r0,MSR_VEC@h /* Disable altivec */ | |
431 | mfspr r24,SPRN_VRSAVE /* save vrsave register value */ | |
432 | std r24,THREAD_VRSAVE(r3) | |
433 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) | |
434 | #endif /* CONFIG_ALTIVEC */ | |
efcac658 AK |
435 | #ifdef CONFIG_PPC64 |
436 | BEGIN_FTR_SECTION | |
437 | mfspr r25,SPRN_DSCR | |
438 | std r25,THREAD_DSCR(r3) | |
439 | END_FTR_SECTION_IFSET(CPU_FTR_DSCR) | |
440 | #endif | |
9994a338 PM |
441 | and. r0,r0,r22 |
442 | beq+ 1f | |
443 | andc r22,r22,r0 | |
2d27cfd3 | 444 | MTMSRD(r22) |
9994a338 PM |
445 | isync |
446 | 1: std r20,_NIP(r1) | |
447 | mfcr r23 | |
448 | std r23,_CCR(r1) | |
449 | std r1,KSP(r3) /* Set old stack pointer */ | |
450 | ||
2468dcf6 IM |
451 | #ifdef CONFIG_PPC_BOOK3S_64 |
452 | BEGIN_FTR_SECTION | |
9353374b ME |
453 | /* Event based branch registers */ |
454 | mfspr r0, SPRN_BESCR | |
455 | std r0, THREAD_BESCR(r3) | |
456 | mfspr r0, SPRN_EBBHR | |
457 | std r0, THREAD_EBBHR(r3) | |
458 | mfspr r0, SPRN_EBBRR | |
459 | std r0, THREAD_EBBRR(r3) | |
1de2bd4e | 460 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) |
2468dcf6 IM |
461 | #endif |
462 | ||
9994a338 PM |
463 | #ifdef CONFIG_SMP |
464 | /* We need a sync somewhere here to make sure that if the | |
465 | * previous task gets rescheduled on another CPU, it sees all | |
466 | * stores it has performed on this one. | |
467 | */ | |
468 | sync | |
469 | #endif /* CONFIG_SMP */ | |
470 | ||
f89451fb AB |
471 | /* |
472 | * If we optimise away the clear of the reservation in system | |
473 | * calls because we know the CPU tracks the address of the | |
474 | * reservation, then we need to clear it here to cover the | |
475 | * case that the kernel context switch path has no larx | |
476 | * instructions. | |
477 | */ | |
478 | BEGIN_FTR_SECTION | |
479 | ldarx r6,0,r1 | |
480 | END_FTR_SECTION_IFSET(CPU_FTR_STCX_CHECKS_ADDRESS) | |
481 | ||
a515348f MN |
482 | #ifdef CONFIG_PPC_BOOK3S |
483 | /* Cancel all explict user streams as they will have no use after context | |
484 | * switch and will stop the HW from creating streams itself | |
485 | */ | |
486 | DCBT_STOP_ALL_STREAM_IDS(r6) | |
487 | #endif | |
488 | ||
9994a338 PM |
489 | addi r6,r4,-THREAD /* Convert THREAD to 'current' */ |
490 | std r6,PACACURRENT(r13) /* Set new 'current' */ | |
491 | ||
492 | ld r8,KSP(r4) /* new stack pointer */ | |
2d27cfd3 | 493 | #ifdef CONFIG_PPC_BOOK3S |
1189be65 | 494 | BEGIN_FTR_SECTION |
c230328d | 495 | BEGIN_FTR_SECTION_NESTED(95) |
9994a338 PM |
496 | clrrdi r6,r8,28 /* get its ESID */ |
497 | clrrdi r9,r1,28 /* get current sp ESID */ | |
c230328d | 498 | FTR_SECTION_ELSE_NESTED(95) |
1189be65 PM |
499 | clrrdi r6,r8,40 /* get its 1T ESID */ |
500 | clrrdi r9,r1,40 /* get current sp 1T ESID */ | |
44ae3ab3 | 501 | ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(MMU_FTR_1T_SEGMENT, 95) |
c230328d ME |
502 | FTR_SECTION_ELSE |
503 | b 2f | |
44ae3ab3 | 504 | ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_SLB) |
9994a338 PM |
505 | clrldi. r0,r6,2 /* is new ESID c00000000? */ |
506 | cmpd cr1,r6,r9 /* or is new ESID the same as current ESID? */ | |
507 | cror eq,4*cr1+eq,eq | |
508 | beq 2f /* if yes, don't slbie it */ | |
509 | ||
510 | /* Bolt in the new stack SLB entry */ | |
511 | ld r7,KSP_VSID(r4) /* Get new stack's VSID */ | |
512 | oris r0,r6,(SLB_ESID_V)@h | |
513 | ori r0,r0,(SLB_NUM_BOLTED-1)@l | |
1189be65 PM |
514 | BEGIN_FTR_SECTION |
515 | li r9,MMU_SEGSIZE_1T /* insert B field */ | |
516 | oris r6,r6,(MMU_SEGSIZE_1T << SLBIE_SSIZE_SHIFT)@h | |
517 | rldimi r7,r9,SLB_VSID_SSIZE_SHIFT,0 | |
44ae3ab3 | 518 | END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT) |
2f6093c8 | 519 | |
00efee7d MN |
520 | /* Update the last bolted SLB. No write barriers are needed |
521 | * here, provided we only update the current CPU's SLB shadow | |
522 | * buffer. | |
523 | */ | |
2f6093c8 | 524 | ld r9,PACA_SLBSHADOWPTR(r13) |
11a27ad7 | 525 | li r12,0 |
7ffcf8ec AB |
526 | std r12,SLBSHADOW_STACKESID(r9) /* Clear ESID */ |
527 | li r12,SLBSHADOW_STACKVSID | |
528 | STDX_BE r7,r12,r9 /* Save VSID */ | |
529 | li r12,SLBSHADOW_STACKESID | |
530 | STDX_BE r0,r12,r9 /* Save ESID */ | |
2f6093c8 | 531 | |
44ae3ab3 | 532 | /* No need to check for MMU_FTR_NO_SLBIE_B here, since when |
f66bce5e OJ |
533 | * we have 1TB segments, the only CPUs known to have the errata |
534 | * only support less than 1TB of system memory and we'll never | |
535 | * actually hit this code path. | |
536 | */ | |
537 | ||
9994a338 PM |
538 | slbie r6 |
539 | slbie r6 /* Workaround POWER5 < DD2.1 issue */ | |
540 | slbmte r7,r0 | |
541 | isync | |
9994a338 | 542 | 2: |
2d27cfd3 BH |
543 | #endif /* !CONFIG_PPC_BOOK3S */ |
544 | ||
9778b696 | 545 | CURRENT_THREAD_INFO(r7, r8) /* base of new stack */ |
9994a338 PM |
546 | /* Note: this uses SWITCH_FRAME_SIZE rather than INT_FRAME_SIZE |
547 | because we don't need to leave the 288-byte ABI gap at the | |
548 | top of the kernel stack. */ | |
549 | addi r7,r7,THREAD_SIZE-SWITCH_FRAME_SIZE | |
550 | ||
551 | mr r1,r8 /* start using new stack pointer */ | |
552 | std r7,PACAKSAVE(r13) | |
553 | ||
2468dcf6 IM |
554 | #ifdef CONFIG_PPC_BOOK3S_64 |
555 | BEGIN_FTR_SECTION | |
9353374b ME |
556 | /* Event based branch registers */ |
557 | ld r0, THREAD_BESCR(r4) | |
558 | mtspr SPRN_BESCR, r0 | |
559 | ld r0, THREAD_EBBHR(r4) | |
560 | mtspr SPRN_EBBHR, r0 | |
561 | ld r0, THREAD_EBBRR(r4) | |
562 | mtspr SPRN_EBBRR, r0 | |
563 | ||
2468dcf6 IM |
564 | ld r0,THREAD_TAR(r4) |
565 | mtspr SPRN_TAR,r0 | |
1de2bd4e | 566 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) |
2468dcf6 IM |
567 | #endif |
568 | ||
9994a338 PM |
569 | #ifdef CONFIG_ALTIVEC |
570 | BEGIN_FTR_SECTION | |
571 | ld r0,THREAD_VRSAVE(r4) | |
572 | mtspr SPRN_VRSAVE,r0 /* if G4, restore VRSAVE reg */ | |
573 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) | |
574 | #endif /* CONFIG_ALTIVEC */ | |
efcac658 AK |
575 | #ifdef CONFIG_PPC64 |
576 | BEGIN_FTR_SECTION | |
71433285 AB |
577 | lwz r6,THREAD_DSCR_INHERIT(r4) |
578 | ld r7,DSCR_DEFAULT@toc(2) | |
efcac658 | 579 | ld r0,THREAD_DSCR(r4) |
71433285 AB |
580 | cmpwi r6,0 |
581 | bne 1f | |
582 | ld r0,0(r7) | |
2517617e | 583 | 1: |
bc683a7e MN |
584 | BEGIN_FTR_SECTION_NESTED(70) |
585 | mfspr r8, SPRN_FSCR | |
586 | rldimi r8, r6, FSCR_DSCR_LG, (63 - FSCR_DSCR_LG) | |
587 | mtspr SPRN_FSCR, r8 | |
588 | END_FTR_SECTION_NESTED(CPU_FTR_ARCH_207S, CPU_FTR_ARCH_207S, 70) | |
589 | cmpd r0,r25 | |
71433285 | 590 | beq 2f |
efcac658 | 591 | mtspr SPRN_DSCR,r0 |
71433285 | 592 | 2: |
efcac658 AK |
593 | END_FTR_SECTION_IFSET(CPU_FTR_DSCR) |
594 | #endif | |
9994a338 | 595 | |
71433285 AB |
596 | ld r6,_CCR(r1) |
597 | mtcrf 0xFF,r6 | |
598 | ||
9994a338 PM |
599 | /* r3-r13 are destroyed -- Cort */ |
600 | REST_8GPRS(14, r1) | |
601 | REST_10GPRS(22, r1) | |
602 | ||
603 | /* convert old thread to its task_struct for return value */ | |
604 | addi r3,r3,-THREAD | |
605 | ld r7,_NIP(r1) /* Return to _switch caller in new task */ | |
606 | mtlr r7 | |
607 | addi r1,r1,SWITCH_FRAME_SIZE | |
608 | blr | |
609 | ||
610 | .align 7 | |
611 | _GLOBAL(ret_from_except) | |
612 | ld r11,_TRAP(r1) | |
613 | andi. r0,r11,1 | |
614 | bne .ret_from_except_lite | |
615 | REST_NVGPRS(r1) | |
616 | ||
617 | _GLOBAL(ret_from_except_lite) | |
618 | /* | |
619 | * Disable interrupts so that current_thread_info()->flags | |
620 | * can't change between when we test it and when we return | |
621 | * from the interrupt. | |
622 | */ | |
2d27cfd3 BH |
623 | #ifdef CONFIG_PPC_BOOK3E |
624 | wrteei 0 | |
625 | #else | |
d9ada91a BH |
626 | ld r10,PACAKMSR(r13) /* Get kernel MSR without EE */ |
627 | mtmsrd r10,1 /* Update machine state */ | |
2d27cfd3 | 628 | #endif /* CONFIG_PPC_BOOK3E */ |
9994a338 | 629 | |
9778b696 | 630 | CURRENT_THREAD_INFO(r9, r1) |
9994a338 | 631 | ld r3,_MSR(r1) |
13d543cd BB |
632 | #ifdef CONFIG_PPC_BOOK3E |
633 | ld r10,PACACURRENT(r13) | |
634 | #endif /* CONFIG_PPC_BOOK3E */ | |
9994a338 | 635 | ld r4,TI_FLAGS(r9) |
9994a338 | 636 | andi. r3,r3,MSR_PR |
c58ce2b1 | 637 | beq resume_kernel |
13d543cd BB |
638 | #ifdef CONFIG_PPC_BOOK3E |
639 | lwz r3,(THREAD+THREAD_DBCR0)(r10) | |
640 | #endif /* CONFIG_PPC_BOOK3E */ | |
9994a338 PM |
641 | |
642 | /* Check current_thread_info()->flags */ | |
c58ce2b1 | 643 | andi. r0,r4,_TIF_USER_WORK_MASK |
13d543cd BB |
644 | #ifdef CONFIG_PPC_BOOK3E |
645 | bne 1f | |
646 | /* | |
647 | * Check to see if the dbcr0 register is set up to debug. | |
648 | * Use the internal debug mode bit to do this. | |
649 | */ | |
650 | andis. r0,r3,DBCR0_IDM@h | |
c58ce2b1 | 651 | beq restore |
13d543cd BB |
652 | mfmsr r0 |
653 | rlwinm r0,r0,0,~MSR_DE /* Clear MSR.DE */ | |
654 | mtmsr r0 | |
655 | mtspr SPRN_DBCR0,r3 | |
656 | li r10, -1 | |
657 | mtspr SPRN_DBSR,r10 | |
658 | b restore | |
659 | #else | |
660 | beq restore | |
661 | #endif | |
662 | 1: andi. r0,r4,_TIF_NEED_RESCHED | |
663 | beq 2f | |
c58ce2b1 | 664 | bl .restore_interrupts |
5d1c5745 | 665 | SCHEDULE_USER |
c58ce2b1 | 666 | b .ret_from_except_lite |
d31626f7 PM |
667 | 2: |
668 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
669 | andi. r0,r4,_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM | |
670 | bne 3f /* only restore TM if nothing else to do */ | |
671 | addi r3,r1,STACK_FRAME_OVERHEAD | |
672 | bl .restore_tm_state | |
673 | b restore | |
674 | 3: | |
675 | #endif | |
676 | bl .save_nvgprs | |
c58ce2b1 TC |
677 | bl .restore_interrupts |
678 | addi r3,r1,STACK_FRAME_OVERHEAD | |
679 | bl .do_notify_resume | |
680 | b .ret_from_except | |
681 | ||
682 | resume_kernel: | |
a9c4e541 | 683 | /* check current_thread_info, _TIF_EMULATE_STACK_STORE */ |
0edfdd10 | 684 | andis. r8,r4,_TIF_EMULATE_STACK_STORE@h |
a9c4e541 TC |
685 | beq+ 1f |
686 | ||
687 | addi r8,r1,INT_FRAME_SIZE /* Get the kprobed function entry */ | |
688 | ||
689 | lwz r3,GPR1(r1) | |
690 | subi r3,r3,INT_FRAME_SIZE /* dst: Allocate a trampoline exception frame */ | |
691 | mr r4,r1 /* src: current exception frame */ | |
692 | mr r1,r3 /* Reroute the trampoline frame to r1 */ | |
693 | ||
694 | /* Copy from the original to the trampoline. */ | |
695 | li r5,INT_FRAME_SIZE/8 /* size: INT_FRAME_SIZE */ | |
696 | li r6,0 /* start offset: 0 */ | |
697 | mtctr r5 | |
698 | 2: ldx r0,r6,r4 | |
699 | stdx r0,r6,r3 | |
700 | addi r6,r6,8 | |
701 | bdnz 2b | |
702 | ||
703 | /* Do real store operation to complete stwu */ | |
704 | lwz r5,GPR1(r1) | |
705 | std r8,0(r5) | |
706 | ||
707 | /* Clear _TIF_EMULATE_STACK_STORE flag */ | |
708 | lis r11,_TIF_EMULATE_STACK_STORE@h | |
709 | addi r5,r9,TI_FLAGS | |
d8b92292 | 710 | 0: ldarx r4,0,r5 |
a9c4e541 TC |
711 | andc r4,r4,r11 |
712 | stdcx. r4,0,r5 | |
713 | bne- 0b | |
714 | 1: | |
715 | ||
c58ce2b1 TC |
716 | #ifdef CONFIG_PREEMPT |
717 | /* Check if we need to preempt */ | |
718 | andi. r0,r4,_TIF_NEED_RESCHED | |
719 | beq+ restore | |
720 | /* Check that preempt_count() == 0 and interrupts are enabled */ | |
721 | lwz r8,TI_PREEMPT(r9) | |
722 | cmpwi cr1,r8,0 | |
723 | ld r0,SOFTE(r1) | |
724 | cmpdi r0,0 | |
725 | crandc eq,cr1*4+eq,eq | |
726 | bne restore | |
727 | ||
728 | /* | |
729 | * Here we are preempting the current task. We want to make | |
de021bb7 | 730 | * sure we are soft-disabled first and reconcile irq state. |
c58ce2b1 | 731 | */ |
de021bb7 | 732 | RECONCILE_IRQ_STATE(r3,r4) |
c58ce2b1 TC |
733 | 1: bl .preempt_schedule_irq |
734 | ||
735 | /* Re-test flags and eventually loop */ | |
9778b696 | 736 | CURRENT_THREAD_INFO(r9, r1) |
9994a338 | 737 | ld r4,TI_FLAGS(r9) |
c58ce2b1 TC |
738 | andi. r0,r4,_TIF_NEED_RESCHED |
739 | bne 1b | |
572177d7 TC |
740 | |
741 | /* | |
742 | * arch_local_irq_restore() from preempt_schedule_irq above may | |
743 | * enable hard interrupt but we really should disable interrupts | |
744 | * when we return from the interrupt, and so that we don't get | |
745 | * interrupted after loading SRR0/1. | |
746 | */ | |
747 | #ifdef CONFIG_PPC_BOOK3E | |
748 | wrteei 0 | |
749 | #else | |
750 | ld r10,PACAKMSR(r13) /* Get kernel MSR without EE */ | |
751 | mtmsrd r10,1 /* Update machine state */ | |
752 | #endif /* CONFIG_PPC_BOOK3E */ | |
c58ce2b1 | 753 | #endif /* CONFIG_PREEMPT */ |
9994a338 | 754 | |
7230c564 BH |
755 | .globl fast_exc_return_irq |
756 | fast_exc_return_irq: | |
9994a338 | 757 | restore: |
7230c564 | 758 | /* |
7c0482e3 BH |
759 | * This is the main kernel exit path. First we check if we |
760 | * are about to re-enable interrupts | |
7230c564 | 761 | */ |
01f3880d | 762 | ld r5,SOFTE(r1) |
7230c564 | 763 | lbz r6,PACASOFTIRQEN(r13) |
7c0482e3 BH |
764 | cmpwi cr0,r5,0 |
765 | beq restore_irq_off | |
7230c564 | 766 | |
7c0482e3 BH |
767 | /* We are enabling, were we already enabled ? Yes, just return */ |
768 | cmpwi cr0,r6,1 | |
769 | beq cr0,do_restore | |
9994a338 | 770 | |
7c0482e3 | 771 | /* |
7230c564 BH |
772 | * We are about to soft-enable interrupts (we are hard disabled |
773 | * at this point). We check if there's anything that needs to | |
774 | * be replayed first. | |
775 | */ | |
776 | lbz r0,PACAIRQHAPPENED(r13) | |
777 | cmpwi cr0,r0,0 | |
778 | bne- restore_check_irq_replay | |
e56a6e20 | 779 | |
7230c564 BH |
780 | /* |
781 | * Get here when nothing happened while soft-disabled, just | |
782 | * soft-enable and move-on. We will hard-enable as a side | |
783 | * effect of rfi | |
784 | */ | |
785 | restore_no_replay: | |
786 | TRACE_ENABLE_INTS | |
787 | li r0,1 | |
788 | stb r0,PACASOFTIRQEN(r13); | |
789 | ||
790 | /* | |
791 | * Final return path. BookE is handled in a different file | |
792 | */ | |
7c0482e3 | 793 | do_restore: |
2d27cfd3 BH |
794 | #ifdef CONFIG_PPC_BOOK3E |
795 | b .exception_return_book3e | |
796 | #else | |
7230c564 BH |
797 | /* |
798 | * Clear the reservation. If we know the CPU tracks the address of | |
799 | * the reservation then we can potentially save some cycles and use | |
800 | * a larx. On POWER6 and POWER7 this is significantly faster. | |
801 | */ | |
802 | BEGIN_FTR_SECTION | |
803 | stdcx. r0,0,r1 /* to clear the reservation */ | |
804 | FTR_SECTION_ELSE | |
805 | ldarx r4,0,r1 | |
806 | ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) | |
807 | ||
808 | /* | |
809 | * Some code path such as load_up_fpu or altivec return directly | |
810 | * here. They run entirely hard disabled and do not alter the | |
811 | * interrupt state. They also don't use lwarx/stwcx. and thus | |
812 | * are known not to leave dangling reservations. | |
813 | */ | |
814 | .globl fast_exception_return | |
815 | fast_exception_return: | |
816 | ld r3,_MSR(r1) | |
e56a6e20 PM |
817 | ld r4,_CTR(r1) |
818 | ld r0,_LINK(r1) | |
819 | mtctr r4 | |
820 | mtlr r0 | |
821 | ld r4,_XER(r1) | |
822 | mtspr SPRN_XER,r4 | |
823 | ||
824 | REST_8GPRS(5, r1) | |
825 | ||
9994a338 PM |
826 | andi. r0,r3,MSR_RI |
827 | beq- unrecov_restore | |
828 | ||
0c4888ef BH |
829 | /* Load PPR from thread struct before we clear MSR:RI */ |
830 | BEGIN_FTR_SECTION | |
831 | ld r2,PACACURRENT(r13) | |
832 | ld r2,TASKTHREADPPR(r2) | |
833 | END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) | |
834 | ||
e56a6e20 PM |
835 | /* |
836 | * Clear RI before restoring r13. If we are returning to | |
837 | * userspace and we take an exception after restoring r13, | |
838 | * we end up corrupting the userspace r13 value. | |
839 | */ | |
d9ada91a BH |
840 | ld r4,PACAKMSR(r13) /* Get kernel MSR without EE */ |
841 | andc r4,r4,r0 /* r0 contains MSR_RI here */ | |
e56a6e20 | 842 | mtmsrd r4,1 |
9994a338 | 843 | |
afc07701 MN |
844 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
845 | /* TM debug */ | |
846 | std r3, PACATMSCRATCH(r13) /* Stash returned-to MSR */ | |
847 | #endif | |
9994a338 PM |
848 | /* |
849 | * r13 is our per cpu area, only restore it if we are returning to | |
7230c564 BH |
850 | * userspace the value stored in the stack frame may belong to |
851 | * another CPU. | |
9994a338 | 852 | */ |
e56a6e20 | 853 | andi. r0,r3,MSR_PR |
9994a338 | 854 | beq 1f |
0c4888ef BH |
855 | BEGIN_FTR_SECTION |
856 | mtspr SPRN_PPR,r2 /* Restore PPR */ | |
857 | END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) | |
e56a6e20 | 858 | ACCOUNT_CPU_USER_EXIT(r2, r4) |
9994a338 PM |
859 | REST_GPR(13, r1) |
860 | 1: | |
e56a6e20 | 861 | mtspr SPRN_SRR1,r3 |
9994a338 PM |
862 | |
863 | ld r2,_CCR(r1) | |
864 | mtcrf 0xFF,r2 | |
865 | ld r2,_NIP(r1) | |
866 | mtspr SPRN_SRR0,r2 | |
867 | ||
868 | ld r0,GPR0(r1) | |
869 | ld r2,GPR2(r1) | |
870 | ld r3,GPR3(r1) | |
871 | ld r4,GPR4(r1) | |
872 | ld r1,GPR1(r1) | |
873 | ||
874 | rfid | |
875 | b . /* prevent speculative execution */ | |
876 | ||
2d27cfd3 BH |
877 | #endif /* CONFIG_PPC_BOOK3E */ |
878 | ||
7c0482e3 BH |
879 | /* |
880 | * We are returning to a context with interrupts soft disabled. | |
881 | * | |
882 | * However, we may also about to hard enable, so we need to | |
883 | * make sure that in this case, we also clear PACA_IRQ_HARD_DIS | |
884 | * or that bit can get out of sync and bad things will happen | |
885 | */ | |
886 | restore_irq_off: | |
887 | ld r3,_MSR(r1) | |
888 | lbz r7,PACAIRQHAPPENED(r13) | |
889 | andi. r0,r3,MSR_EE | |
890 | beq 1f | |
891 | rlwinm r7,r7,0,~PACA_IRQ_HARD_DIS | |
892 | stb r7,PACAIRQHAPPENED(r13) | |
893 | 1: li r0,0 | |
894 | stb r0,PACASOFTIRQEN(r13); | |
895 | TRACE_DISABLE_INTS | |
896 | b do_restore | |
897 | ||
7230c564 BH |
898 | /* |
899 | * Something did happen, check if a re-emit is needed | |
900 | * (this also clears paca->irq_happened) | |
901 | */ | |
902 | restore_check_irq_replay: | |
903 | /* XXX: We could implement a fast path here where we check | |
904 | * for irq_happened being just 0x01, in which case we can | |
905 | * clear it and return. That means that we would potentially | |
906 | * miss a decrementer having wrapped all the way around. | |
907 | * | |
908 | * Still, this might be useful for things like hash_page | |
909 | */ | |
910 | bl .__check_irq_replay | |
911 | cmpwi cr0,r3,0 | |
912 | beq restore_no_replay | |
913 | ||
914 | /* | |
915 | * We need to re-emit an interrupt. We do so by re-using our | |
916 | * existing exception frame. We first change the trap value, | |
917 | * but we need to ensure we preserve the low nibble of it | |
918 | */ | |
919 | ld r4,_TRAP(r1) | |
920 | clrldi r4,r4,60 | |
921 | or r4,r4,r3 | |
922 | std r4,_TRAP(r1) | |
923 | ||
924 | /* | |
925 | * Then find the right handler and call it. Interrupts are | |
926 | * still soft-disabled and we keep them that way. | |
927 | */ | |
928 | cmpwi cr0,r3,0x500 | |
929 | bne 1f | |
930 | addi r3,r1,STACK_FRAME_OVERHEAD; | |
931 | bl .do_IRQ | |
932 | b .ret_from_except | |
933 | 1: cmpwi cr0,r3,0x900 | |
934 | bne 1f | |
935 | addi r3,r1,STACK_FRAME_OVERHEAD; | |
936 | bl .timer_interrupt | |
937 | b .ret_from_except | |
fe9e1d54 IM |
938 | #ifdef CONFIG_PPC_DOORBELL |
939 | 1: | |
7230c564 | 940 | #ifdef CONFIG_PPC_BOOK3E |
fe9e1d54 IM |
941 | cmpwi cr0,r3,0x280 |
942 | #else | |
943 | BEGIN_FTR_SECTION | |
944 | cmpwi cr0,r3,0xe80 | |
945 | FTR_SECTION_ELSE | |
946 | cmpwi cr0,r3,0xa00 | |
947 | ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) | |
948 | #endif /* CONFIG_PPC_BOOK3E */ | |
7230c564 BH |
949 | bne 1f |
950 | addi r3,r1,STACK_FRAME_OVERHEAD; | |
951 | bl .doorbell_exception | |
952 | b .ret_from_except | |
fe9e1d54 | 953 | #endif /* CONFIG_PPC_DOORBELL */ |
7230c564 BH |
954 | 1: b .ret_from_except /* What else to do here ? */ |
955 | ||
9994a338 PM |
956 | unrecov_restore: |
957 | addi r3,r1,STACK_FRAME_OVERHEAD | |
958 | bl .unrecoverable_exception | |
959 | b unrecov_restore | |
960 | ||
961 | #ifdef CONFIG_PPC_RTAS | |
962 | /* | |
963 | * On CHRP, the Run-Time Abstraction Services (RTAS) have to be | |
964 | * called with the MMU off. | |
965 | * | |
966 | * In addition, we need to be in 32b mode, at least for now. | |
967 | * | |
968 | * Note: r3 is an input parameter to rtas, so don't trash it... | |
969 | */ | |
970 | _GLOBAL(enter_rtas) | |
971 | mflr r0 | |
972 | std r0,16(r1) | |
973 | stdu r1,-RTAS_FRAME_SIZE(r1) /* Save SP and create stack space. */ | |
974 | ||
975 | /* Because RTAS is running in 32b mode, it clobbers the high order half | |
976 | * of all registers that it saves. We therefore save those registers | |
977 | * RTAS might touch to the stack. (r0, r3-r13 are caller saved) | |
978 | */ | |
979 | SAVE_GPR(2, r1) /* Save the TOC */ | |
980 | SAVE_GPR(13, r1) /* Save paca */ | |
981 | SAVE_8GPRS(14, r1) /* Save the non-volatiles */ | |
982 | SAVE_10GPRS(22, r1) /* ditto */ | |
983 | ||
984 | mfcr r4 | |
985 | std r4,_CCR(r1) | |
986 | mfctr r5 | |
987 | std r5,_CTR(r1) | |
988 | mfspr r6,SPRN_XER | |
989 | std r6,_XER(r1) | |
990 | mfdar r7 | |
991 | std r7,_DAR(r1) | |
992 | mfdsisr r8 | |
993 | std r8,_DSISR(r1) | |
9994a338 | 994 | |
9fe901d1 MK |
995 | /* Temporary workaround to clear CR until RTAS can be modified to |
996 | * ignore all bits. | |
997 | */ | |
998 | li r0,0 | |
999 | mtcr r0 | |
1000 | ||
007d88d0 | 1001 | #ifdef CONFIG_BUG |
9994a338 PM |
1002 | /* There is no way it is acceptable to get here with interrupts enabled, |
1003 | * check it with the asm equivalent of WARN_ON | |
1004 | */ | |
d04c56f7 | 1005 | lbz r0,PACASOFTIRQEN(r13) |
9994a338 | 1006 | 1: tdnei r0,0 |
007d88d0 DW |
1007 | EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,BUGFLAG_WARNING |
1008 | #endif | |
1009 | ||
d04c56f7 PM |
1010 | /* Hard-disable interrupts */ |
1011 | mfmsr r6 | |
1012 | rldicl r7,r6,48,1 | |
1013 | rotldi r7,r7,16 | |
1014 | mtmsrd r7,1 | |
1015 | ||
9994a338 PM |
1016 | /* Unfortunately, the stack pointer and the MSR are also clobbered, |
1017 | * so they are saved in the PACA which allows us to restore | |
1018 | * our original state after RTAS returns. | |
1019 | */ | |
1020 | std r1,PACAR1(r13) | |
1021 | std r6,PACASAVEDMSR(r13) | |
1022 | ||
1023 | /* Setup our real return addr */ | |
e58c3495 DG |
1024 | LOAD_REG_ADDR(r4,.rtas_return_loc) |
1025 | clrldi r4,r4,2 /* convert to realmode address */ | |
9994a338 PM |
1026 | mtlr r4 |
1027 | ||
1028 | li r0,0 | |
1029 | ori r0,r0,MSR_EE|MSR_SE|MSR_BE|MSR_RI | |
1030 | andc r0,r6,r0 | |
1031 | ||
1032 | li r9,1 | |
1033 | rldicr r9,r9,MSR_SF_LG,(63-MSR_SF_LG) | |
5c0484e2 | 1034 | ori r9,r9,MSR_IR|MSR_DR|MSR_FE0|MSR_FE1|MSR_FP|MSR_RI|MSR_LE |
9994a338 | 1035 | andc r6,r0,r9 |
9994a338 PM |
1036 | sync /* disable interrupts so SRR0/1 */ |
1037 | mtmsrd r0 /* don't get trashed */ | |
1038 | ||
e58c3495 | 1039 | LOAD_REG_ADDR(r4, rtas) |
9994a338 PM |
1040 | ld r5,RTASENTRY(r4) /* get the rtas->entry value */ |
1041 | ld r4,RTASBASE(r4) /* get the rtas->base value */ | |
1042 | ||
1043 | mtspr SPRN_SRR0,r5 | |
1044 | mtspr SPRN_SRR1,r6 | |
1045 | rfid | |
1046 | b . /* prevent speculative execution */ | |
1047 | ||
1048 | _STATIC(rtas_return_loc) | |
5c0484e2 BH |
1049 | FIXUP_ENDIAN |
1050 | ||
9994a338 | 1051 | /* relocation is off at this point */ |
2dd60d79 | 1052 | GET_PACA(r4) |
e58c3495 | 1053 | clrldi r4,r4,2 /* convert to realmode address */ |
9994a338 | 1054 | |
e31aa453 PM |
1055 | bcl 20,31,$+4 |
1056 | 0: mflr r3 | |
1057 | ld r3,(1f-0b)(r3) /* get &.rtas_restore_regs */ | |
1058 | ||
9994a338 PM |
1059 | mfmsr r6 |
1060 | li r0,MSR_RI | |
1061 | andc r6,r6,r0 | |
1062 | sync | |
1063 | mtmsrd r6 | |
1064 | ||
1065 | ld r1,PACAR1(r4) /* Restore our SP */ | |
9994a338 PM |
1066 | ld r4,PACASAVEDMSR(r4) /* Restore our MSR */ |
1067 | ||
1068 | mtspr SPRN_SRR0,r3 | |
1069 | mtspr SPRN_SRR1,r4 | |
1070 | rfid | |
1071 | b . /* prevent speculative execution */ | |
1072 | ||
e31aa453 PM |
1073 | .align 3 |
1074 | 1: .llong .rtas_restore_regs | |
1075 | ||
9994a338 PM |
1076 | _STATIC(rtas_restore_regs) |
1077 | /* relocation is on at this point */ | |
1078 | REST_GPR(2, r1) /* Restore the TOC */ | |
1079 | REST_GPR(13, r1) /* Restore paca */ | |
1080 | REST_8GPRS(14, r1) /* Restore the non-volatiles */ | |
1081 | REST_10GPRS(22, r1) /* ditto */ | |
1082 | ||
2dd60d79 | 1083 | GET_PACA(r13) |
9994a338 PM |
1084 | |
1085 | ld r4,_CCR(r1) | |
1086 | mtcr r4 | |
1087 | ld r5,_CTR(r1) | |
1088 | mtctr r5 | |
1089 | ld r6,_XER(r1) | |
1090 | mtspr SPRN_XER,r6 | |
1091 | ld r7,_DAR(r1) | |
1092 | mtdar r7 | |
1093 | ld r8,_DSISR(r1) | |
1094 | mtdsisr r8 | |
9994a338 PM |
1095 | |
1096 | addi r1,r1,RTAS_FRAME_SIZE /* Unstack our frame */ | |
1097 | ld r0,16(r1) /* get return address */ | |
1098 | ||
1099 | mtlr r0 | |
1100 | blr /* return to caller */ | |
1101 | ||
1102 | #endif /* CONFIG_PPC_RTAS */ | |
1103 | ||
9994a338 PM |
1104 | _GLOBAL(enter_prom) |
1105 | mflr r0 | |
1106 | std r0,16(r1) | |
1107 | stdu r1,-PROM_FRAME_SIZE(r1) /* Save SP and create stack space */ | |
1108 | ||
1109 | /* Because PROM is running in 32b mode, it clobbers the high order half | |
1110 | * of all registers that it saves. We therefore save those registers | |
1111 | * PROM might touch to the stack. (r0, r3-r13 are caller saved) | |
1112 | */ | |
6c171994 | 1113 | SAVE_GPR(2, r1) |
9994a338 PM |
1114 | SAVE_GPR(13, r1) |
1115 | SAVE_8GPRS(14, r1) | |
1116 | SAVE_10GPRS(22, r1) | |
6c171994 | 1117 | mfcr r10 |
9994a338 | 1118 | mfmsr r11 |
6c171994 | 1119 | std r10,_CCR(r1) |
9994a338 PM |
1120 | std r11,_MSR(r1) |
1121 | ||
5c0484e2 BH |
1122 | /* Put PROM address in SRR0 */ |
1123 | mtsrr0 r4 | |
1124 | ||
1125 | /* Setup our trampoline return addr in LR */ | |
1126 | bcl 20,31,$+4 | |
1127 | 0: mflr r4 | |
1128 | addi r4,r4,(1f - 0b) | |
1129 | mtlr r4 | |
9994a338 | 1130 | |
5c0484e2 | 1131 | /* Prepare a 32-bit mode big endian MSR |
9994a338 | 1132 | */ |
2d27cfd3 BH |
1133 | #ifdef CONFIG_PPC_BOOK3E |
1134 | rlwinm r11,r11,0,1,31 | |
5c0484e2 BH |
1135 | mtsrr1 r11 |
1136 | rfi | |
2d27cfd3 | 1137 | #else /* CONFIG_PPC_BOOK3E */ |
5c0484e2 BH |
1138 | LOAD_REG_IMMEDIATE(r12, MSR_SF | MSR_ISF | MSR_LE) |
1139 | andc r11,r11,r12 | |
1140 | mtsrr1 r11 | |
1141 | rfid | |
2d27cfd3 | 1142 | #endif /* CONFIG_PPC_BOOK3E */ |
9994a338 | 1143 | |
5c0484e2 BH |
1144 | 1: /* Return from OF */ |
1145 | FIXUP_ENDIAN | |
9994a338 PM |
1146 | |
1147 | /* Just make sure that r1 top 32 bits didn't get | |
1148 | * corrupt by OF | |
1149 | */ | |
1150 | rldicl r1,r1,0,32 | |
1151 | ||
1152 | /* Restore the MSR (back to 64 bits) */ | |
1153 | ld r0,_MSR(r1) | |
6c171994 | 1154 | MTMSRD(r0) |
9994a338 PM |
1155 | isync |
1156 | ||
1157 | /* Restore other registers */ | |
1158 | REST_GPR(2, r1) | |
1159 | REST_GPR(13, r1) | |
1160 | REST_8GPRS(14, r1) | |
1161 | REST_10GPRS(22, r1) | |
1162 | ld r4,_CCR(r1) | |
1163 | mtcr r4 | |
9994a338 PM |
1164 | |
1165 | addi r1,r1,PROM_FRAME_SIZE | |
1166 | ld r0,16(r1) | |
1167 | mtlr r0 | |
1168 | blr | |
4e491d14 | 1169 | |
606576ce | 1170 | #ifdef CONFIG_FUNCTION_TRACER |
4e491d14 SR |
1171 | #ifdef CONFIG_DYNAMIC_FTRACE |
1172 | _GLOBAL(mcount) | |
1173 | _GLOBAL(_mcount) | |
4e491d14 SR |
1174 | blr |
1175 | ||
1176 | _GLOBAL(ftrace_caller) | |
1177 | /* Taken from output of objdump from lib64/glibc */ | |
1178 | mflr r3 | |
1179 | ld r11, 0(r1) | |
1180 | stdu r1, -112(r1) | |
1181 | std r3, 128(r1) | |
1182 | ld r4, 16(r11) | |
395a59d0 | 1183 | subi r3, r3, MCOUNT_INSN_SIZE |
4e491d14 SR |
1184 | .globl ftrace_call |
1185 | ftrace_call: | |
1186 | bl ftrace_stub | |
1187 | nop | |
46542888 SR |
1188 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1189 | .globl ftrace_graph_call | |
1190 | ftrace_graph_call: | |
1191 | b ftrace_graph_stub | |
1192 | _GLOBAL(ftrace_graph_stub) | |
1193 | #endif | |
4e491d14 SR |
1194 | ld r0, 128(r1) |
1195 | mtlr r0 | |
1196 | addi r1, r1, 112 | |
1197 | _GLOBAL(ftrace_stub) | |
1198 | blr | |
1199 | #else | |
1200 | _GLOBAL(mcount) | |
1201 | blr | |
1202 | ||
1203 | _GLOBAL(_mcount) | |
1204 | /* Taken from output of objdump from lib64/glibc */ | |
1205 | mflr r3 | |
1206 | ld r11, 0(r1) | |
1207 | stdu r1, -112(r1) | |
1208 | std r3, 128(r1) | |
1209 | ld r4, 16(r11) | |
1210 | ||
395a59d0 | 1211 | subi r3, r3, MCOUNT_INSN_SIZE |
4e491d14 SR |
1212 | LOAD_REG_ADDR(r5,ftrace_trace_function) |
1213 | ld r5,0(r5) | |
1214 | ld r5,0(r5) | |
1215 | mtctr r5 | |
1216 | bctrl | |
4e491d14 | 1217 | nop |
6794c782 SR |
1218 | |
1219 | ||
1220 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
1221 | b ftrace_graph_caller | |
1222 | #endif | |
4e491d14 SR |
1223 | ld r0, 128(r1) |
1224 | mtlr r0 | |
1225 | addi r1, r1, 112 | |
1226 | _GLOBAL(ftrace_stub) | |
1227 | blr | |
1228 | ||
6794c782 SR |
1229 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
1230 | ||
1231 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
46542888 | 1232 | _GLOBAL(ftrace_graph_caller) |
6794c782 SR |
1233 | /* load r4 with local address */ |
1234 | ld r4, 128(r1) | |
1235 | subi r4, r4, MCOUNT_INSN_SIZE | |
1236 | ||
1237 | /* get the parent address */ | |
1238 | ld r11, 112(r1) | |
1239 | addi r3, r11, 16 | |
1240 | ||
1241 | bl .prepare_ftrace_return | |
1242 | nop | |
1243 | ||
1244 | ld r0, 128(r1) | |
1245 | mtlr r0 | |
1246 | addi r1, r1, 112 | |
1247 | blr | |
1248 | ||
1249 | _GLOBAL(return_to_handler) | |
bb725340 SR |
1250 | /* need to save return values */ |
1251 | std r4, -24(r1) | |
1252 | std r3, -16(r1) | |
1253 | std r31, -8(r1) | |
1254 | mr r31, r1 | |
1255 | stdu r1, -112(r1) | |
1256 | ||
1257 | bl .ftrace_return_to_handler | |
1258 | nop | |
1259 | ||
1260 | /* return value has real return address */ | |
1261 | mtlr r3 | |
1262 | ||
1263 | ld r1, 0(r1) | |
1264 | ld r4, -24(r1) | |
1265 | ld r3, -16(r1) | |
1266 | ld r31, -8(r1) | |
1267 | ||
1268 | /* Jump back to real return address */ | |
1269 | blr | |
1270 | ||
1271 | _GLOBAL(mod_return_to_handler) | |
6794c782 SR |
1272 | /* need to save return values */ |
1273 | std r4, -32(r1) | |
1274 | std r3, -24(r1) | |
1275 | /* save TOC */ | |
1276 | std r2, -16(r1) | |
1277 | std r31, -8(r1) | |
1278 | mr r31, r1 | |
1279 | stdu r1, -112(r1) | |
1280 | ||
bb725340 SR |
1281 | /* |
1282 | * We are in a module using the module's TOC. | |
1283 | * Switch to our TOC to run inside the core kernel. | |
1284 | */ | |
be10ab10 | 1285 | ld r2, PACATOC(r13) |
6794c782 SR |
1286 | |
1287 | bl .ftrace_return_to_handler | |
1288 | nop | |
1289 | ||
1290 | /* return value has real return address */ | |
1291 | mtlr r3 | |
1292 | ||
1293 | ld r1, 0(r1) | |
1294 | ld r4, -32(r1) | |
1295 | ld r3, -24(r1) | |
1296 | ld r2, -16(r1) | |
1297 | ld r31, -8(r1) | |
1298 | ||
1299 | /* Jump back to real return address */ | |
1300 | blr | |
1301 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
1302 | #endif /* CONFIG_FUNCTION_TRACER */ |