]>
Commit | Line | Data |
---|---|---|
14cf11af | 1 | /* |
14cf11af PM |
2 | * Derived from "arch/i386/kernel/process.c" |
3 | * Copyright (C) 1995 Linus Torvalds | |
4 | * | |
5 | * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and | |
6 | * Paul Mackerras (paulus@cs.anu.edu.au) | |
7 | * | |
8 | * PowerPC version | |
9 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | */ | |
16 | ||
14cf11af PM |
17 | #include <linux/errno.h> |
18 | #include <linux/sched.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/smp.h> | |
14cf11af PM |
22 | #include <linux/stddef.h> |
23 | #include <linux/unistd.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/user.h> | |
27 | #include <linux/elf.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/prctl.h> | |
30 | #include <linux/init_task.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/kallsyms.h> | |
33 | #include <linux/mqueue.h> | |
34 | #include <linux/hardirq.h> | |
06d67d54 | 35 | #include <linux/utsname.h> |
14cf11af PM |
36 | |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/uaccess.h> | |
39 | #include <asm/system.h> | |
40 | #include <asm/io.h> | |
41 | #include <asm/processor.h> | |
42 | #include <asm/mmu.h> | |
43 | #include <asm/prom.h> | |
76032de8 | 44 | #include <asm/machdep.h> |
c6622f63 | 45 | #include <asm/time.h> |
a7f31841 | 46 | #include <asm/syscalls.h> |
06d67d54 PM |
47 | #ifdef CONFIG_PPC64 |
48 | #include <asm/firmware.h> | |
06d67d54 | 49 | #endif |
14cf11af PM |
50 | |
51 | extern unsigned long _get_SP(void); | |
52 | ||
53 | #ifndef CONFIG_SMP | |
54 | struct task_struct *last_task_used_math = NULL; | |
55 | struct task_struct *last_task_used_altivec = NULL; | |
56 | struct task_struct *last_task_used_spe = NULL; | |
57 | #endif | |
58 | ||
14cf11af PM |
59 | /* |
60 | * Make sure the floating-point register state in the | |
61 | * the thread_struct is up to date for task tsk. | |
62 | */ | |
63 | void flush_fp_to_thread(struct task_struct *tsk) | |
64 | { | |
65 | if (tsk->thread.regs) { | |
66 | /* | |
67 | * We need to disable preemption here because if we didn't, | |
68 | * another process could get scheduled after the regs->msr | |
69 | * test but before we have finished saving the FP registers | |
70 | * to the thread_struct. That process could take over the | |
71 | * FPU, and then when we get scheduled again we would store | |
72 | * bogus values for the remaining FP registers. | |
73 | */ | |
74 | preempt_disable(); | |
75 | if (tsk->thread.regs->msr & MSR_FP) { | |
76 | #ifdef CONFIG_SMP | |
77 | /* | |
78 | * This should only ever be called for current or | |
79 | * for a stopped child process. Since we save away | |
80 | * the FP register state on context switch on SMP, | |
81 | * there is something wrong if a stopped child appears | |
82 | * to still have its FP state in the CPU registers. | |
83 | */ | |
84 | BUG_ON(tsk != current); | |
85 | #endif | |
0ee6c15e | 86 | giveup_fpu(tsk); |
14cf11af PM |
87 | } |
88 | preempt_enable(); | |
89 | } | |
90 | } | |
91 | ||
92 | void enable_kernel_fp(void) | |
93 | { | |
94 | WARN_ON(preemptible()); | |
95 | ||
96 | #ifdef CONFIG_SMP | |
97 | if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) | |
98 | giveup_fpu(current); | |
99 | else | |
100 | giveup_fpu(NULL); /* just enables FP for kernel */ | |
101 | #else | |
102 | giveup_fpu(last_task_used_math); | |
103 | #endif /* CONFIG_SMP */ | |
104 | } | |
105 | EXPORT_SYMBOL(enable_kernel_fp); | |
106 | ||
107 | int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs) | |
108 | { | |
109 | if (!tsk->thread.regs) | |
110 | return 0; | |
111 | flush_fp_to_thread(current); | |
112 | ||
113 | memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs)); | |
114 | ||
115 | return 1; | |
116 | } | |
117 | ||
118 | #ifdef CONFIG_ALTIVEC | |
119 | void enable_kernel_altivec(void) | |
120 | { | |
121 | WARN_ON(preemptible()); | |
122 | ||
123 | #ifdef CONFIG_SMP | |
124 | if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) | |
125 | giveup_altivec(current); | |
126 | else | |
127 | giveup_altivec(NULL); /* just enable AltiVec for kernel - force */ | |
128 | #else | |
129 | giveup_altivec(last_task_used_altivec); | |
130 | #endif /* CONFIG_SMP */ | |
131 | } | |
132 | EXPORT_SYMBOL(enable_kernel_altivec); | |
133 | ||
134 | /* | |
135 | * Make sure the VMX/Altivec register state in the | |
136 | * the thread_struct is up to date for task tsk. | |
137 | */ | |
138 | void flush_altivec_to_thread(struct task_struct *tsk) | |
139 | { | |
140 | if (tsk->thread.regs) { | |
141 | preempt_disable(); | |
142 | if (tsk->thread.regs->msr & MSR_VEC) { | |
143 | #ifdef CONFIG_SMP | |
144 | BUG_ON(tsk != current); | |
145 | #endif | |
0ee6c15e | 146 | giveup_altivec(tsk); |
14cf11af PM |
147 | } |
148 | preempt_enable(); | |
149 | } | |
150 | } | |
151 | ||
1f7d6668 | 152 | int dump_task_altivec(struct task_struct *tsk, elf_vrregset_t *vrregs) |
14cf11af | 153 | { |
1f7d6668 MN |
154 | /* ELF_NVRREG includes the VSCR and VRSAVE which we need to save |
155 | * separately, see below */ | |
156 | const int nregs = ELF_NVRREG - 2; | |
157 | elf_vrreg_t *reg; | |
158 | u32 *dest; | |
159 | ||
160 | if (tsk == current) | |
161 | flush_altivec_to_thread(tsk); | |
162 | ||
163 | reg = (elf_vrreg_t *)vrregs; | |
164 | ||
165 | /* copy the 32 vr registers */ | |
166 | memcpy(reg, &tsk->thread.vr[0], nregs * sizeof(*reg)); | |
167 | reg += nregs; | |
168 | ||
169 | /* copy the vscr */ | |
170 | memcpy(reg, &tsk->thread.vscr, sizeof(*reg)); | |
171 | reg++; | |
172 | ||
173 | /* vrsave is stored in the high 32bit slot of the final 128bits */ | |
174 | memset(reg, 0, sizeof(*reg)); | |
175 | dest = (u32 *)reg; | |
176 | *dest = tsk->thread.vrsave; | |
177 | ||
14cf11af PM |
178 | return 1; |
179 | } | |
180 | #endif /* CONFIG_ALTIVEC */ | |
181 | ||
182 | #ifdef CONFIG_SPE | |
183 | ||
184 | void enable_kernel_spe(void) | |
185 | { | |
186 | WARN_ON(preemptible()); | |
187 | ||
188 | #ifdef CONFIG_SMP | |
189 | if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) | |
190 | giveup_spe(current); | |
191 | else | |
192 | giveup_spe(NULL); /* just enable SPE for kernel - force */ | |
193 | #else | |
194 | giveup_spe(last_task_used_spe); | |
195 | #endif /* __SMP __ */ | |
196 | } | |
197 | EXPORT_SYMBOL(enable_kernel_spe); | |
198 | ||
199 | void flush_spe_to_thread(struct task_struct *tsk) | |
200 | { | |
201 | if (tsk->thread.regs) { | |
202 | preempt_disable(); | |
203 | if (tsk->thread.regs->msr & MSR_SPE) { | |
204 | #ifdef CONFIG_SMP | |
205 | BUG_ON(tsk != current); | |
206 | #endif | |
0ee6c15e | 207 | giveup_spe(tsk); |
14cf11af PM |
208 | } |
209 | preempt_enable(); | |
210 | } | |
211 | } | |
212 | ||
213 | int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs) | |
214 | { | |
215 | flush_spe_to_thread(current); | |
216 | /* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */ | |
217 | memcpy(evrregs, ¤t->thread.evr[0], sizeof(u32) * 35); | |
218 | return 1; | |
219 | } | |
220 | #endif /* CONFIG_SPE */ | |
221 | ||
5388fb10 | 222 | #ifndef CONFIG_SMP |
48abec07 PM |
223 | /* |
224 | * If we are doing lazy switching of CPU state (FP, altivec or SPE), | |
225 | * and the current task has some state, discard it. | |
226 | */ | |
5388fb10 | 227 | void discard_lazy_cpu_state(void) |
48abec07 | 228 | { |
48abec07 PM |
229 | preempt_disable(); |
230 | if (last_task_used_math == current) | |
231 | last_task_used_math = NULL; | |
232 | #ifdef CONFIG_ALTIVEC | |
233 | if (last_task_used_altivec == current) | |
234 | last_task_used_altivec = NULL; | |
235 | #endif /* CONFIG_ALTIVEC */ | |
236 | #ifdef CONFIG_SPE | |
237 | if (last_task_used_spe == current) | |
238 | last_task_used_spe = NULL; | |
239 | #endif | |
240 | preempt_enable(); | |
48abec07 | 241 | } |
5388fb10 | 242 | #endif /* CONFIG_SMP */ |
48abec07 | 243 | |
14cf11af PM |
244 | int set_dabr(unsigned long dabr) |
245 | { | |
791cc501 | 246 | #ifdef CONFIG_PPC_MERGE /* XXX for now */ |
cab0af98 ME |
247 | if (ppc_md.set_dabr) |
248 | return ppc_md.set_dabr(dabr); | |
791cc501 | 249 | #endif |
14cf11af | 250 | |
791cc501 BH |
251 | /* XXX should we have a CPU_FTR_HAS_DABR ? */ |
252 | #if defined(CONFIG_PPC64) || defined(CONFIG_6xx) | |
cab0af98 | 253 | mtspr(SPRN_DABR, dabr); |
791cc501 | 254 | #endif |
cab0af98 | 255 | return 0; |
14cf11af PM |
256 | } |
257 | ||
06d67d54 PM |
258 | #ifdef CONFIG_PPC64 |
259 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
06d67d54 | 260 | #endif |
14cf11af | 261 | |
791cc501 BH |
262 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
263 | ||
14cf11af PM |
264 | struct task_struct *__switch_to(struct task_struct *prev, |
265 | struct task_struct *new) | |
266 | { | |
267 | struct thread_struct *new_thread, *old_thread; | |
268 | unsigned long flags; | |
269 | struct task_struct *last; | |
270 | ||
271 | #ifdef CONFIG_SMP | |
272 | /* avoid complexity of lazy save/restore of fpu | |
273 | * by just saving it every time we switch out if | |
274 | * this task used the fpu during the last quantum. | |
275 | * | |
276 | * If it tries to use the fpu again, it'll trap and | |
277 | * reload its fp regs. So we don't have to do a restore | |
278 | * every switch, just a save. | |
279 | * -- Cort | |
280 | */ | |
281 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP)) | |
282 | giveup_fpu(prev); | |
283 | #ifdef CONFIG_ALTIVEC | |
284 | /* | |
285 | * If the previous thread used altivec in the last quantum | |
286 | * (thus changing altivec regs) then save them. | |
287 | * We used to check the VRSAVE register but not all apps | |
288 | * set it, so we don't rely on it now (and in fact we need | |
289 | * to save & restore VSCR even if VRSAVE == 0). -- paulus | |
290 | * | |
291 | * On SMP we always save/restore altivec regs just to avoid the | |
292 | * complexity of changing processors. | |
293 | * -- Cort | |
294 | */ | |
295 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) | |
296 | giveup_altivec(prev); | |
14cf11af PM |
297 | #endif /* CONFIG_ALTIVEC */ |
298 | #ifdef CONFIG_SPE | |
299 | /* | |
300 | * If the previous thread used spe in the last quantum | |
301 | * (thus changing spe regs) then save them. | |
302 | * | |
303 | * On SMP we always save/restore spe regs just to avoid the | |
304 | * complexity of changing processors. | |
305 | */ | |
306 | if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE))) | |
307 | giveup_spe(prev); | |
c0c0d996 PM |
308 | #endif /* CONFIG_SPE */ |
309 | ||
310 | #else /* CONFIG_SMP */ | |
311 | #ifdef CONFIG_ALTIVEC | |
312 | /* Avoid the trap. On smp this this never happens since | |
313 | * we don't set last_task_used_altivec -- Cort | |
314 | */ | |
315 | if (new->thread.regs && last_task_used_altivec == new) | |
316 | new->thread.regs->msr |= MSR_VEC; | |
317 | #endif /* CONFIG_ALTIVEC */ | |
318 | #ifdef CONFIG_SPE | |
14cf11af PM |
319 | /* Avoid the trap. On smp this this never happens since |
320 | * we don't set last_task_used_spe | |
321 | */ | |
322 | if (new->thread.regs && last_task_used_spe == new) | |
323 | new->thread.regs->msr |= MSR_SPE; | |
324 | #endif /* CONFIG_SPE */ | |
c0c0d996 | 325 | |
14cf11af PM |
326 | #endif /* CONFIG_SMP */ |
327 | ||
14cf11af PM |
328 | if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) { |
329 | set_dabr(new->thread.dabr); | |
330 | __get_cpu_var(current_dabr) = new->thread.dabr; | |
331 | } | |
14cf11af PM |
332 | |
333 | new_thread = &new->thread; | |
334 | old_thread = ¤t->thread; | |
06d67d54 PM |
335 | |
336 | #ifdef CONFIG_PPC64 | |
337 | /* | |
338 | * Collect processor utilization data per process | |
339 | */ | |
340 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { | |
341 | struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array); | |
342 | long unsigned start_tb, current_tb; | |
343 | start_tb = old_thread->start_tb; | |
344 | cu->current_tb = current_tb = mfspr(SPRN_PURR); | |
345 | old_thread->accum_tb += (current_tb - start_tb); | |
346 | new_thread->start_tb = current_tb; | |
347 | } | |
348 | #endif | |
349 | ||
14cf11af | 350 | local_irq_save(flags); |
c6622f63 PM |
351 | |
352 | account_system_vtime(current); | |
81a3843f | 353 | account_process_vtime(current); |
c6622f63 PM |
354 | calculate_steal_time(); |
355 | ||
44387e9f AB |
356 | /* |
357 | * We can't take a PMU exception inside _switch() since there is a | |
358 | * window where the kernel stack SLB and the kernel stack are out | |
359 | * of sync. Hard disable here. | |
360 | */ | |
361 | hard_irq_disable(); | |
14cf11af PM |
362 | last = _switch(old_thread, new_thread); |
363 | ||
364 | local_irq_restore(flags); | |
365 | ||
366 | return last; | |
367 | } | |
368 | ||
06d67d54 PM |
369 | static int instructions_to_print = 16; |
370 | ||
06d67d54 PM |
371 | static void show_instructions(struct pt_regs *regs) |
372 | { | |
373 | int i; | |
374 | unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * | |
375 | sizeof(int)); | |
376 | ||
377 | printk("Instruction dump:"); | |
378 | ||
379 | for (i = 0; i < instructions_to_print; i++) { | |
380 | int instr; | |
381 | ||
382 | if (!(i % 8)) | |
383 | printk("\n"); | |
384 | ||
0de2d820 SW |
385 | #if !defined(CONFIG_BOOKE) |
386 | /* If executing with the IMMU off, adjust pc rather | |
387 | * than print XXXXXXXX. | |
388 | */ | |
389 | if (!(regs->msr & MSR_IR)) | |
390 | pc = (unsigned long)phys_to_virt(pc); | |
391 | #endif | |
392 | ||
af308377 SR |
393 | /* We use __get_user here *only* to avoid an OOPS on a |
394 | * bad address because the pc *should* only be a | |
395 | * kernel address. | |
396 | */ | |
00ae36de AB |
397 | if (!__kernel_text_address(pc) || |
398 | __get_user(instr, (unsigned int __user *)pc)) { | |
06d67d54 PM |
399 | printk("XXXXXXXX "); |
400 | } else { | |
401 | if (regs->nip == pc) | |
402 | printk("<%08x> ", instr); | |
403 | else | |
404 | printk("%08x ", instr); | |
405 | } | |
406 | ||
407 | pc += sizeof(int); | |
408 | } | |
409 | ||
410 | printk("\n"); | |
411 | } | |
412 | ||
413 | static struct regbit { | |
414 | unsigned long bit; | |
415 | const char *name; | |
416 | } msr_bits[] = { | |
417 | {MSR_EE, "EE"}, | |
418 | {MSR_PR, "PR"}, | |
419 | {MSR_FP, "FP"}, | |
420 | {MSR_ME, "ME"}, | |
421 | {MSR_IR, "IR"}, | |
422 | {MSR_DR, "DR"}, | |
423 | {0, NULL} | |
424 | }; | |
425 | ||
426 | static void printbits(unsigned long val, struct regbit *bits) | |
427 | { | |
428 | const char *sep = ""; | |
429 | ||
430 | printk("<"); | |
431 | for (; bits->bit; ++bits) | |
432 | if (val & bits->bit) { | |
433 | printk("%s%s", sep, bits->name); | |
434 | sep = ","; | |
435 | } | |
436 | printk(">"); | |
437 | } | |
438 | ||
439 | #ifdef CONFIG_PPC64 | |
f6f7dde3 | 440 | #define REG "%016lx" |
06d67d54 PM |
441 | #define REGS_PER_LINE 4 |
442 | #define LAST_VOLATILE 13 | |
443 | #else | |
f6f7dde3 | 444 | #define REG "%08lx" |
06d67d54 PM |
445 | #define REGS_PER_LINE 8 |
446 | #define LAST_VOLATILE 12 | |
447 | #endif | |
448 | ||
14cf11af PM |
449 | void show_regs(struct pt_regs * regs) |
450 | { | |
451 | int i, trap; | |
452 | ||
06d67d54 PM |
453 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", |
454 | regs->nip, regs->link, regs->ctr); | |
455 | printk("REGS: %p TRAP: %04lx %s (%s)\n", | |
96b644bd | 456 | regs, regs->trap, print_tainted(), init_utsname()->release); |
06d67d54 PM |
457 | printk("MSR: "REG" ", regs->msr); |
458 | printbits(regs->msr, msr_bits); | |
f6f7dde3 | 459 | printk(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer); |
14cf11af PM |
460 | trap = TRAP(regs); |
461 | if (trap == 0x300 || trap == 0x600) | |
14170789 KG |
462 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) |
463 | printk("DEAR: "REG", ESR: "REG"\n", regs->dar, regs->dsisr); | |
464 | #else | |
06d67d54 | 465 | printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr); |
14170789 | 466 | #endif |
06d67d54 | 467 | printk("TASK = %p[%d] '%s' THREAD: %p", |
19c5870c | 468 | current, task_pid_nr(current), current->comm, task_thread_info(current)); |
14cf11af PM |
469 | |
470 | #ifdef CONFIG_SMP | |
79ccd1be | 471 | printk(" CPU: %d", raw_smp_processor_id()); |
14cf11af PM |
472 | #endif /* CONFIG_SMP */ |
473 | ||
474 | for (i = 0; i < 32; i++) { | |
06d67d54 | 475 | if ((i % REGS_PER_LINE) == 0) |
14cf11af | 476 | printk("\n" KERN_INFO "GPR%02d: ", i); |
06d67d54 PM |
477 | printk(REG " ", regs->gpr[i]); |
478 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) | |
14cf11af PM |
479 | break; |
480 | } | |
481 | printk("\n"); | |
482 | #ifdef CONFIG_KALLSYMS | |
483 | /* | |
484 | * Lookup NIP late so we have the best change of getting the | |
485 | * above info out without failing | |
486 | */ | |
06d67d54 | 487 | printk("NIP ["REG"] ", regs->nip); |
14cf11af | 488 | print_symbol("%s\n", regs->nip); |
06d67d54 | 489 | printk("LR ["REG"] ", regs->link); |
14cf11af PM |
490 | print_symbol("%s\n", regs->link); |
491 | #endif | |
492 | show_stack(current, (unsigned long *) regs->gpr[1]); | |
06d67d54 PM |
493 | if (!user_mode(regs)) |
494 | show_instructions(regs); | |
14cf11af PM |
495 | } |
496 | ||
497 | void exit_thread(void) | |
498 | { | |
48abec07 | 499 | discard_lazy_cpu_state(); |
14cf11af PM |
500 | } |
501 | ||
502 | void flush_thread(void) | |
503 | { | |
06d67d54 PM |
504 | #ifdef CONFIG_PPC64 |
505 | struct thread_info *t = current_thread_info(); | |
506 | ||
f144e7c7 MD |
507 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
508 | clear_ti_thread_flag(t, TIF_ABI_PENDING); | |
509 | if (test_ti_thread_flag(t, TIF_32BIT)) | |
510 | clear_ti_thread_flag(t, TIF_32BIT); | |
511 | else | |
512 | set_ti_thread_flag(t, TIF_32BIT); | |
513 | } | |
06d67d54 | 514 | #endif |
06d67d54 | 515 | |
48abec07 | 516 | discard_lazy_cpu_state(); |
14cf11af | 517 | |
14cf11af PM |
518 | if (current->thread.dabr) { |
519 | current->thread.dabr = 0; | |
520 | set_dabr(0); | |
521 | } | |
14cf11af PM |
522 | } |
523 | ||
524 | void | |
525 | release_thread(struct task_struct *t) | |
526 | { | |
527 | } | |
528 | ||
529 | /* | |
530 | * This gets called before we allocate a new thread and copy | |
531 | * the current task into it. | |
532 | */ | |
533 | void prepare_to_copy(struct task_struct *tsk) | |
534 | { | |
535 | flush_fp_to_thread(current); | |
536 | flush_altivec_to_thread(current); | |
537 | flush_spe_to_thread(current); | |
538 | } | |
539 | ||
540 | /* | |
541 | * Copy a thread.. | |
542 | */ | |
06d67d54 PM |
543 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, |
544 | unsigned long unused, struct task_struct *p, | |
545 | struct pt_regs *regs) | |
14cf11af PM |
546 | { |
547 | struct pt_regs *childregs, *kregs; | |
548 | extern void ret_from_fork(void); | |
0cec6fd1 | 549 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
14cf11af PM |
550 | |
551 | CHECK_FULL_REGS(regs); | |
552 | /* Copy registers */ | |
553 | sp -= sizeof(struct pt_regs); | |
554 | childregs = (struct pt_regs *) sp; | |
555 | *childregs = *regs; | |
556 | if ((childregs->msr & MSR_PR) == 0) { | |
557 | /* for kernel thread, set `current' and stackptr in new task */ | |
558 | childregs->gpr[1] = sp + sizeof(struct pt_regs); | |
06d67d54 | 559 | #ifdef CONFIG_PPC32 |
14cf11af | 560 | childregs->gpr[2] = (unsigned long) p; |
06d67d54 | 561 | #else |
b5e2fc1c | 562 | clear_tsk_thread_flag(p, TIF_32BIT); |
06d67d54 | 563 | #endif |
14cf11af PM |
564 | p->thread.regs = NULL; /* no user register state */ |
565 | } else { | |
566 | childregs->gpr[1] = usp; | |
567 | p->thread.regs = childregs; | |
06d67d54 PM |
568 | if (clone_flags & CLONE_SETTLS) { |
569 | #ifdef CONFIG_PPC64 | |
570 | if (!test_thread_flag(TIF_32BIT)) | |
571 | childregs->gpr[13] = childregs->gpr[6]; | |
572 | else | |
573 | #endif | |
574 | childregs->gpr[2] = childregs->gpr[6]; | |
575 | } | |
14cf11af PM |
576 | } |
577 | childregs->gpr[3] = 0; /* Result from fork() */ | |
578 | sp -= STACK_FRAME_OVERHEAD; | |
14cf11af PM |
579 | |
580 | /* | |
581 | * The way this works is that at some point in the future | |
582 | * some task will call _switch to switch to the new task. | |
583 | * That will pop off the stack frame created below and start | |
584 | * the new task running at ret_from_fork. The new task will | |
585 | * do some house keeping and then return from the fork or clone | |
586 | * system call, using the stack frame created above. | |
587 | */ | |
588 | sp -= sizeof(struct pt_regs); | |
589 | kregs = (struct pt_regs *) sp; | |
590 | sp -= STACK_FRAME_OVERHEAD; | |
591 | p->thread.ksp = sp; | |
14cf11af | 592 | |
06d67d54 PM |
593 | #ifdef CONFIG_PPC64 |
594 | if (cpu_has_feature(CPU_FTR_SLB)) { | |
1189be65 | 595 | unsigned long sp_vsid; |
3c726f8d | 596 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; |
06d67d54 | 597 | |
1189be65 PM |
598 | if (cpu_has_feature(CPU_FTR_1T_SEGMENT)) |
599 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T) | |
600 | << SLB_VSID_SHIFT_1T; | |
601 | else | |
602 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M) | |
603 | << SLB_VSID_SHIFT; | |
3c726f8d | 604 | sp_vsid |= SLB_VSID_KERNEL | llp; |
06d67d54 PM |
605 | p->thread.ksp_vsid = sp_vsid; |
606 | } | |
607 | ||
608 | /* | |
609 | * The PPC64 ABI makes use of a TOC to contain function | |
610 | * pointers. The function (ret_from_except) is actually a pointer | |
611 | * to the TOC entry. The first entry is a pointer to the actual | |
612 | * function. | |
613 | */ | |
614 | kregs->nip = *((unsigned long *)ret_from_fork); | |
615 | #else | |
616 | kregs->nip = (unsigned long)ret_from_fork; | |
06d67d54 | 617 | #endif |
14cf11af PM |
618 | |
619 | return 0; | |
620 | } | |
621 | ||
622 | /* | |
623 | * Set up a thread for executing a new program | |
624 | */ | |
06d67d54 | 625 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) |
14cf11af | 626 | { |
90eac727 ME |
627 | #ifdef CONFIG_PPC64 |
628 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ | |
629 | #endif | |
630 | ||
14cf11af | 631 | set_fs(USER_DS); |
06d67d54 PM |
632 | |
633 | /* | |
634 | * If we exec out of a kernel thread then thread.regs will not be | |
635 | * set. Do it now. | |
636 | */ | |
637 | if (!current->thread.regs) { | |
0cec6fd1 AV |
638 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; |
639 | current->thread.regs = regs - 1; | |
06d67d54 PM |
640 | } |
641 | ||
14cf11af PM |
642 | memset(regs->gpr, 0, sizeof(regs->gpr)); |
643 | regs->ctr = 0; | |
644 | regs->link = 0; | |
645 | regs->xer = 0; | |
646 | regs->ccr = 0; | |
14cf11af | 647 | regs->gpr[1] = sp; |
06d67d54 | 648 | |
474f8196 RM |
649 | /* |
650 | * We have just cleared all the nonvolatile GPRs, so make | |
651 | * FULL_REGS(regs) return true. This is necessary to allow | |
652 | * ptrace to examine the thread immediately after exec. | |
653 | */ | |
654 | regs->trap &= ~1UL; | |
655 | ||
06d67d54 PM |
656 | #ifdef CONFIG_PPC32 |
657 | regs->mq = 0; | |
658 | regs->nip = start; | |
14cf11af | 659 | regs->msr = MSR_USER; |
06d67d54 | 660 | #else |
d4bf9a78 | 661 | if (!test_thread_flag(TIF_32BIT)) { |
90eac727 | 662 | unsigned long entry, toc; |
06d67d54 PM |
663 | |
664 | /* start is a relocated pointer to the function descriptor for | |
665 | * the elf _start routine. The first entry in the function | |
666 | * descriptor is the entry address of _start and the second | |
667 | * entry is the TOC value we need to use. | |
668 | */ | |
669 | __get_user(entry, (unsigned long __user *)start); | |
670 | __get_user(toc, (unsigned long __user *)start+1); | |
671 | ||
672 | /* Check whether the e_entry function descriptor entries | |
673 | * need to be relocated before we can use them. | |
674 | */ | |
675 | if (load_addr != 0) { | |
676 | entry += load_addr; | |
677 | toc += load_addr; | |
678 | } | |
679 | regs->nip = entry; | |
680 | regs->gpr[2] = toc; | |
681 | regs->msr = MSR_USER64; | |
d4bf9a78 SR |
682 | } else { |
683 | regs->nip = start; | |
684 | regs->gpr[2] = 0; | |
685 | regs->msr = MSR_USER32; | |
06d67d54 PM |
686 | } |
687 | #endif | |
688 | ||
48abec07 | 689 | discard_lazy_cpu_state(); |
14cf11af | 690 | memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); |
25c8a78b | 691 | current->thread.fpscr.val = 0; |
14cf11af PM |
692 | #ifdef CONFIG_ALTIVEC |
693 | memset(current->thread.vr, 0, sizeof(current->thread.vr)); | |
694 | memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr)); | |
06d67d54 | 695 | current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ |
14cf11af PM |
696 | current->thread.vrsave = 0; |
697 | current->thread.used_vr = 0; | |
698 | #endif /* CONFIG_ALTIVEC */ | |
699 | #ifdef CONFIG_SPE | |
700 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); | |
701 | current->thread.acc = 0; | |
702 | current->thread.spefscr = 0; | |
703 | current->thread.used_spe = 0; | |
704 | #endif /* CONFIG_SPE */ | |
705 | } | |
706 | ||
707 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ | |
708 | | PR_FP_EXC_RES | PR_FP_EXC_INV) | |
709 | ||
710 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) | |
711 | { | |
712 | struct pt_regs *regs = tsk->thread.regs; | |
713 | ||
714 | /* This is a bit hairy. If we are an SPE enabled processor | |
715 | * (have embedded fp) we store the IEEE exception enable flags in | |
716 | * fpexc_mode. fpexc_mode is also used for setting FP exception | |
717 | * mode (asyn, precise, disabled) for 'Classic' FP. */ | |
718 | if (val & PR_FP_EXC_SW_ENABLE) { | |
719 | #ifdef CONFIG_SPE | |
5e14d21e KG |
720 | if (cpu_has_feature(CPU_FTR_SPE)) { |
721 | tsk->thread.fpexc_mode = val & | |
722 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); | |
723 | return 0; | |
724 | } else { | |
725 | return -EINVAL; | |
726 | } | |
14cf11af PM |
727 | #else |
728 | return -EINVAL; | |
729 | #endif | |
14cf11af | 730 | } |
06d67d54 PM |
731 | |
732 | /* on a CONFIG_SPE this does not hurt us. The bits that | |
733 | * __pack_fe01 use do not overlap with bits used for | |
734 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits | |
735 | * on CONFIG_SPE implementations are reserved so writing to | |
736 | * them does not change anything */ | |
737 | if (val > PR_FP_EXC_PRECISE) | |
738 | return -EINVAL; | |
739 | tsk->thread.fpexc_mode = __pack_fe01(val); | |
740 | if (regs != NULL && (regs->msr & MSR_FP) != 0) | |
741 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) | |
742 | | tsk->thread.fpexc_mode; | |
14cf11af PM |
743 | return 0; |
744 | } | |
745 | ||
746 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) | |
747 | { | |
748 | unsigned int val; | |
749 | ||
750 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) | |
751 | #ifdef CONFIG_SPE | |
5e14d21e KG |
752 | if (cpu_has_feature(CPU_FTR_SPE)) |
753 | val = tsk->thread.fpexc_mode; | |
754 | else | |
755 | return -EINVAL; | |
14cf11af PM |
756 | #else |
757 | return -EINVAL; | |
758 | #endif | |
759 | else | |
760 | val = __unpack_fe01(tsk->thread.fpexc_mode); | |
761 | return put_user(val, (unsigned int __user *) adr); | |
762 | } | |
763 | ||
fab5db97 PM |
764 | int set_endian(struct task_struct *tsk, unsigned int val) |
765 | { | |
766 | struct pt_regs *regs = tsk->thread.regs; | |
767 | ||
768 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || | |
769 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) | |
770 | return -EINVAL; | |
771 | ||
772 | if (regs == NULL) | |
773 | return -EINVAL; | |
774 | ||
775 | if (val == PR_ENDIAN_BIG) | |
776 | regs->msr &= ~MSR_LE; | |
777 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) | |
778 | regs->msr |= MSR_LE; | |
779 | else | |
780 | return -EINVAL; | |
781 | ||
782 | return 0; | |
783 | } | |
784 | ||
785 | int get_endian(struct task_struct *tsk, unsigned long adr) | |
786 | { | |
787 | struct pt_regs *regs = tsk->thread.regs; | |
788 | unsigned int val; | |
789 | ||
790 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && | |
791 | !cpu_has_feature(CPU_FTR_REAL_LE)) | |
792 | return -EINVAL; | |
793 | ||
794 | if (regs == NULL) | |
795 | return -EINVAL; | |
796 | ||
797 | if (regs->msr & MSR_LE) { | |
798 | if (cpu_has_feature(CPU_FTR_REAL_LE)) | |
799 | val = PR_ENDIAN_LITTLE; | |
800 | else | |
801 | val = PR_ENDIAN_PPC_LITTLE; | |
802 | } else | |
803 | val = PR_ENDIAN_BIG; | |
804 | ||
805 | return put_user(val, (unsigned int __user *)adr); | |
806 | } | |
807 | ||
e9370ae1 PM |
808 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) |
809 | { | |
810 | tsk->thread.align_ctl = val; | |
811 | return 0; | |
812 | } | |
813 | ||
814 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) | |
815 | { | |
816 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); | |
817 | } | |
818 | ||
06d67d54 PM |
819 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
820 | ||
14cf11af PM |
821 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
822 | int __user *parent_tidp, void __user *child_threadptr, | |
823 | int __user *child_tidp, int p6, | |
824 | struct pt_regs *regs) | |
825 | { | |
826 | CHECK_FULL_REGS(regs); | |
827 | if (usp == 0) | |
828 | usp = regs->gpr[1]; /* stack pointer for child */ | |
06d67d54 PM |
829 | #ifdef CONFIG_PPC64 |
830 | if (test_thread_flag(TIF_32BIT)) { | |
831 | parent_tidp = TRUNC_PTR(parent_tidp); | |
832 | child_tidp = TRUNC_PTR(child_tidp); | |
833 | } | |
834 | #endif | |
14cf11af PM |
835 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
836 | } | |
837 | ||
838 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, | |
839 | unsigned long p4, unsigned long p5, unsigned long p6, | |
840 | struct pt_regs *regs) | |
841 | { | |
842 | CHECK_FULL_REGS(regs); | |
843 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); | |
844 | } | |
845 | ||
846 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, | |
847 | unsigned long p4, unsigned long p5, unsigned long p6, | |
848 | struct pt_regs *regs) | |
849 | { | |
850 | CHECK_FULL_REGS(regs); | |
851 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], | |
852 | regs, 0, NULL, NULL); | |
853 | } | |
854 | ||
855 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, | |
856 | unsigned long a3, unsigned long a4, unsigned long a5, | |
857 | struct pt_regs *regs) | |
858 | { | |
859 | int error; | |
06d67d54 | 860 | char *filename; |
14cf11af PM |
861 | |
862 | filename = getname((char __user *) a0); | |
863 | error = PTR_ERR(filename); | |
864 | if (IS_ERR(filename)) | |
865 | goto out; | |
866 | flush_fp_to_thread(current); | |
867 | flush_altivec_to_thread(current); | |
868 | flush_spe_to_thread(current); | |
20c8c210 PM |
869 | error = do_execve(filename, (char __user * __user *) a1, |
870 | (char __user * __user *) a2, regs); | |
14cf11af PM |
871 | if (error == 0) { |
872 | task_lock(current); | |
873 | current->ptrace &= ~PT_DTRACE; | |
874 | task_unlock(current); | |
875 | } | |
876 | putname(filename); | |
877 | out: | |
878 | return error; | |
879 | } | |
880 | ||
bb72c481 PM |
881 | #ifdef CONFIG_IRQSTACKS |
882 | static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, | |
883 | unsigned long nbytes) | |
884 | { | |
885 | unsigned long stack_page; | |
886 | unsigned long cpu = task_cpu(p); | |
887 | ||
888 | /* | |
889 | * Avoid crashing if the stack has overflowed and corrupted | |
890 | * task_cpu(p), which is in the thread_info struct. | |
891 | */ | |
892 | if (cpu < NR_CPUS && cpu_possible(cpu)) { | |
893 | stack_page = (unsigned long) hardirq_ctx[cpu]; | |
894 | if (sp >= stack_page + sizeof(struct thread_struct) | |
895 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
896 | return 1; | |
897 | ||
898 | stack_page = (unsigned long) softirq_ctx[cpu]; | |
899 | if (sp >= stack_page + sizeof(struct thread_struct) | |
900 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
901 | return 1; | |
902 | } | |
903 | return 0; | |
904 | } | |
905 | ||
906 | #else | |
907 | #define valid_irq_stack(sp, p, nb) 0 | |
908 | #endif /* CONFIG_IRQSTACKS */ | |
909 | ||
2f25194d | 910 | int validate_sp(unsigned long sp, struct task_struct *p, |
14cf11af PM |
911 | unsigned long nbytes) |
912 | { | |
0cec6fd1 | 913 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
14cf11af PM |
914 | |
915 | if (sp >= stack_page + sizeof(struct thread_struct) | |
916 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
917 | return 1; | |
918 | ||
bb72c481 | 919 | return valid_irq_stack(sp, p, nbytes); |
14cf11af PM |
920 | } |
921 | ||
06d67d54 PM |
922 | #ifdef CONFIG_PPC64 |
923 | #define MIN_STACK_FRAME 112 /* same as STACK_FRAME_OVERHEAD, in fact */ | |
924 | #define FRAME_LR_SAVE 2 | |
925 | #define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288) | |
926 | #define REGS_MARKER 0x7265677368657265ul | |
927 | #define FRAME_MARKER 12 | |
928 | #else | |
929 | #define MIN_STACK_FRAME 16 | |
930 | #define FRAME_LR_SAVE 1 | |
931 | #define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD) | |
932 | #define REGS_MARKER 0x72656773ul | |
933 | #define FRAME_MARKER 2 | |
14cf11af | 934 | #endif |
14cf11af | 935 | |
2f25194d AB |
936 | EXPORT_SYMBOL(validate_sp); |
937 | ||
14cf11af PM |
938 | unsigned long get_wchan(struct task_struct *p) |
939 | { | |
940 | unsigned long ip, sp; | |
941 | int count = 0; | |
942 | ||
943 | if (!p || p == current || p->state == TASK_RUNNING) | |
944 | return 0; | |
945 | ||
946 | sp = p->thread.ksp; | |
06d67d54 | 947 | if (!validate_sp(sp, p, MIN_STACK_FRAME)) |
14cf11af PM |
948 | return 0; |
949 | ||
950 | do { | |
951 | sp = *(unsigned long *)sp; | |
06d67d54 | 952 | if (!validate_sp(sp, p, MIN_STACK_FRAME)) |
14cf11af PM |
953 | return 0; |
954 | if (count > 0) { | |
06d67d54 | 955 | ip = ((unsigned long *)sp)[FRAME_LR_SAVE]; |
14cf11af PM |
956 | if (!in_sched_functions(ip)) |
957 | return ip; | |
958 | } | |
959 | } while (count++ < 16); | |
960 | return 0; | |
961 | } | |
06d67d54 PM |
962 | |
963 | static int kstack_depth_to_print = 64; | |
964 | ||
965 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
966 | { | |
967 | unsigned long sp, ip, lr, newsp; | |
968 | int count = 0; | |
969 | int firstframe = 1; | |
970 | ||
971 | sp = (unsigned long) stack; | |
972 | if (tsk == NULL) | |
973 | tsk = current; | |
974 | if (sp == 0) { | |
975 | if (tsk == current) | |
976 | asm("mr %0,1" : "=r" (sp)); | |
977 | else | |
978 | sp = tsk->thread.ksp; | |
979 | } | |
980 | ||
981 | lr = 0; | |
982 | printk("Call Trace:\n"); | |
983 | do { | |
984 | if (!validate_sp(sp, tsk, MIN_STACK_FRAME)) | |
985 | return; | |
986 | ||
987 | stack = (unsigned long *) sp; | |
988 | newsp = stack[0]; | |
989 | ip = stack[FRAME_LR_SAVE]; | |
990 | if (!firstframe || ip != lr) { | |
991 | printk("["REG"] ["REG"] ", sp, ip); | |
992 | print_symbol("%s", ip); | |
993 | if (firstframe) | |
994 | printk(" (unreliable)"); | |
995 | printk("\n"); | |
996 | } | |
997 | firstframe = 0; | |
998 | ||
999 | /* | |
1000 | * See if this is an exception frame. | |
1001 | * We look for the "regshere" marker in the current frame. | |
1002 | */ | |
1003 | if (validate_sp(sp, tsk, INT_FRAME_SIZE) | |
1004 | && stack[FRAME_MARKER] == REGS_MARKER) { | |
1005 | struct pt_regs *regs = (struct pt_regs *) | |
1006 | (sp + STACK_FRAME_OVERHEAD); | |
1007 | printk("--- Exception: %lx", regs->trap); | |
1008 | print_symbol(" at %s\n", regs->nip); | |
1009 | lr = regs->link; | |
1010 | print_symbol(" LR = %s\n", lr); | |
1011 | firstframe = 1; | |
1012 | } | |
1013 | ||
1014 | sp = newsp; | |
1015 | } while (count++ < kstack_depth_to_print); | |
1016 | } | |
1017 | ||
1018 | void dump_stack(void) | |
1019 | { | |
1020 | show_stack(current, NULL); | |
1021 | } | |
1022 | EXPORT_SYMBOL(dump_stack); | |
cb2c9b27 AB |
1023 | |
1024 | #ifdef CONFIG_PPC64 | |
1025 | void ppc64_runlatch_on(void) | |
1026 | { | |
1027 | unsigned long ctrl; | |
1028 | ||
1029 | if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) { | |
1030 | HMT_medium(); | |
1031 | ||
1032 | ctrl = mfspr(SPRN_CTRLF); | |
1033 | ctrl |= CTRL_RUNLATCH; | |
1034 | mtspr(SPRN_CTRLT, ctrl); | |
1035 | ||
1036 | set_thread_flag(TIF_RUNLATCH); | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | void ppc64_runlatch_off(void) | |
1041 | { | |
1042 | unsigned long ctrl; | |
1043 | ||
1044 | if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) { | |
1045 | HMT_medium(); | |
1046 | ||
1047 | clear_thread_flag(TIF_RUNLATCH); | |
1048 | ||
1049 | ctrl = mfspr(SPRN_CTRLF); | |
1050 | ctrl &= ~CTRL_RUNLATCH; | |
1051 | mtspr(SPRN_CTRLT, ctrl); | |
1052 | } | |
1053 | } | |
1054 | #endif |