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1 | /* | |
2 | * Architecture-specific setup. | |
3 | * | |
4 | * Copyright (C) 1998-2003 Hewlett-Packard Co | |
5 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
6 | * 04/11/17 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support | |
7 | * | |
8 | * 2005-10-07 Keith Owens <kaos@sgi.com> | |
9 | * Add notify_die() hooks. | |
10 | */ | |
11 | #include <linux/cpu.h> | |
12 | #include <linux/pm.h> | |
13 | #include <linux/elf.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/notifier.h> | |
20 | #include <linux/personality.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/thread_info.h> | |
25 | #include <linux/unistd.h> | |
26 | #include <linux/efi.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/kdebug.h> | |
30 | #include <linux/utsname.h> | |
31 | #include <linux/tracehook.h> | |
32 | ||
33 | #include <asm/cpu.h> | |
34 | #include <asm/delay.h> | |
35 | #include <asm/elf.h> | |
36 | #include <asm/ia32.h> | |
37 | #include <asm/irq.h> | |
38 | #include <asm/kexec.h> | |
39 | #include <asm/pgalloc.h> | |
40 | #include <asm/processor.h> | |
41 | #include <asm/sal.h> | |
42 | #include <asm/tlbflush.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/unwind.h> | |
45 | #include <asm/user.h> | |
46 | ||
47 | #include "entry.h" | |
48 | ||
49 | #ifdef CONFIG_PERFMON | |
50 | # include <asm/perfmon.h> | |
51 | #endif | |
52 | ||
53 | #include "sigframe.h" | |
54 | ||
55 | void (*ia64_mark_idle)(int); | |
56 | ||
57 | unsigned long boot_option_idle_override = 0; | |
58 | EXPORT_SYMBOL(boot_option_idle_override); | |
59 | unsigned long idle_halt; | |
60 | EXPORT_SYMBOL(idle_halt); | |
61 | unsigned long idle_nomwait; | |
62 | EXPORT_SYMBOL(idle_nomwait); | |
63 | ||
64 | void | |
65 | ia64_do_show_stack (struct unw_frame_info *info, void *arg) | |
66 | { | |
67 | unsigned long ip, sp, bsp; | |
68 | char buf[128]; /* don't make it so big that it overflows the stack! */ | |
69 | ||
70 | printk("\nCall Trace:\n"); | |
71 | do { | |
72 | unw_get_ip(info, &ip); | |
73 | if (ip == 0) | |
74 | break; | |
75 | ||
76 | unw_get_sp(info, &sp); | |
77 | unw_get_bsp(info, &bsp); | |
78 | snprintf(buf, sizeof(buf), | |
79 | " [<%016lx>] %%s\n" | |
80 | " sp=%016lx bsp=%016lx\n", | |
81 | ip, sp, bsp); | |
82 | print_symbol(buf, ip); | |
83 | } while (unw_unwind(info) >= 0); | |
84 | } | |
85 | ||
86 | void | |
87 | show_stack (struct task_struct *task, unsigned long *sp) | |
88 | { | |
89 | if (!task) | |
90 | unw_init_running(ia64_do_show_stack, NULL); | |
91 | else { | |
92 | struct unw_frame_info info; | |
93 | ||
94 | unw_init_from_blocked_task(&info, task); | |
95 | ia64_do_show_stack(&info, NULL); | |
96 | } | |
97 | } | |
98 | ||
99 | void | |
100 | dump_stack (void) | |
101 | { | |
102 | show_stack(NULL, NULL); | |
103 | } | |
104 | ||
105 | EXPORT_SYMBOL(dump_stack); | |
106 | ||
107 | void | |
108 | show_regs (struct pt_regs *regs) | |
109 | { | |
110 | unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri; | |
111 | ||
112 | print_modules(); | |
113 | printk("\nPid: %d, CPU %d, comm: %20s\n", task_pid_nr(current), | |
114 | smp_processor_id(), current->comm); | |
115 | printk("psr : %016lx ifs : %016lx ip : [<%016lx>] %s (%s)\n", | |
116 | regs->cr_ipsr, regs->cr_ifs, ip, print_tainted(), | |
117 | init_utsname()->release); | |
118 | print_symbol("ip is at %s\n", ip); | |
119 | printk("unat: %016lx pfs : %016lx rsc : %016lx\n", | |
120 | regs->ar_unat, regs->ar_pfs, regs->ar_rsc); | |
121 | printk("rnat: %016lx bsps: %016lx pr : %016lx\n", | |
122 | regs->ar_rnat, regs->ar_bspstore, regs->pr); | |
123 | printk("ldrs: %016lx ccv : %016lx fpsr: %016lx\n", | |
124 | regs->loadrs, regs->ar_ccv, regs->ar_fpsr); | |
125 | printk("csd : %016lx ssd : %016lx\n", regs->ar_csd, regs->ar_ssd); | |
126 | printk("b0 : %016lx b6 : %016lx b7 : %016lx\n", regs->b0, regs->b6, regs->b7); | |
127 | printk("f6 : %05lx%016lx f7 : %05lx%016lx\n", | |
128 | regs->f6.u.bits[1], regs->f6.u.bits[0], | |
129 | regs->f7.u.bits[1], regs->f7.u.bits[0]); | |
130 | printk("f8 : %05lx%016lx f9 : %05lx%016lx\n", | |
131 | regs->f8.u.bits[1], regs->f8.u.bits[0], | |
132 | regs->f9.u.bits[1], regs->f9.u.bits[0]); | |
133 | printk("f10 : %05lx%016lx f11 : %05lx%016lx\n", | |
134 | regs->f10.u.bits[1], regs->f10.u.bits[0], | |
135 | regs->f11.u.bits[1], regs->f11.u.bits[0]); | |
136 | ||
137 | printk("r1 : %016lx r2 : %016lx r3 : %016lx\n", regs->r1, regs->r2, regs->r3); | |
138 | printk("r8 : %016lx r9 : %016lx r10 : %016lx\n", regs->r8, regs->r9, regs->r10); | |
139 | printk("r11 : %016lx r12 : %016lx r13 : %016lx\n", regs->r11, regs->r12, regs->r13); | |
140 | printk("r14 : %016lx r15 : %016lx r16 : %016lx\n", regs->r14, regs->r15, regs->r16); | |
141 | printk("r17 : %016lx r18 : %016lx r19 : %016lx\n", regs->r17, regs->r18, regs->r19); | |
142 | printk("r20 : %016lx r21 : %016lx r22 : %016lx\n", regs->r20, regs->r21, regs->r22); | |
143 | printk("r23 : %016lx r24 : %016lx r25 : %016lx\n", regs->r23, regs->r24, regs->r25); | |
144 | printk("r26 : %016lx r27 : %016lx r28 : %016lx\n", regs->r26, regs->r27, regs->r28); | |
145 | printk("r29 : %016lx r30 : %016lx r31 : %016lx\n", regs->r29, regs->r30, regs->r31); | |
146 | ||
147 | if (user_mode(regs)) { | |
148 | /* print the stacked registers */ | |
149 | unsigned long val, *bsp, ndirty; | |
150 | int i, sof, is_nat = 0; | |
151 | ||
152 | sof = regs->cr_ifs & 0x7f; /* size of frame */ | |
153 | ndirty = (regs->loadrs >> 19); | |
154 | bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty); | |
155 | for (i = 0; i < sof; ++i) { | |
156 | get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i)); | |
157 | printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val, | |
158 | ((i == sof - 1) || (i % 3) == 2) ? "\n" : " "); | |
159 | } | |
160 | } else | |
161 | show_stack(NULL, NULL); | |
162 | } | |
163 | ||
164 | /* local support for deprecated console_print */ | |
165 | void | |
166 | console_print(const char *s) | |
167 | { | |
168 | printk(KERN_EMERG "%s", s); | |
169 | } | |
170 | ||
171 | void | |
172 | do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall) | |
173 | { | |
174 | if (fsys_mode(current, &scr->pt)) { | |
175 | /* | |
176 | * defer signal-handling etc. until we return to | |
177 | * privilege-level 0. | |
178 | */ | |
179 | if (!ia64_psr(&scr->pt)->lp) | |
180 | ia64_psr(&scr->pt)->lp = 1; | |
181 | return; | |
182 | } | |
183 | ||
184 | #ifdef CONFIG_PERFMON | |
185 | if (current->thread.pfm_needs_checking) | |
186 | /* | |
187 | * Note: pfm_handle_work() allow us to call it with interrupts | |
188 | * disabled, and may enable interrupts within the function. | |
189 | */ | |
190 | pfm_handle_work(); | |
191 | #endif | |
192 | ||
193 | /* deal with pending signal delivery */ | |
194 | if (test_thread_flag(TIF_SIGPENDING)) { | |
195 | local_irq_enable(); /* force interrupt enable */ | |
196 | ia64_do_signal(scr, in_syscall); | |
197 | } | |
198 | ||
199 | if (test_thread_flag(TIF_NOTIFY_RESUME)) { | |
200 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
201 | tracehook_notify_resume(&scr->pt); | |
202 | if (current->replacement_session_keyring) | |
203 | key_replace_session_keyring(); | |
204 | } | |
205 | ||
206 | /* copy user rbs to kernel rbs */ | |
207 | if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) { | |
208 | local_irq_enable(); /* force interrupt enable */ | |
209 | ia64_sync_krbs(); | |
210 | } | |
211 | ||
212 | local_irq_disable(); /* force interrupt disable */ | |
213 | } | |
214 | ||
215 | static int pal_halt = 1; | |
216 | static int can_do_pal_halt = 1; | |
217 | ||
218 | static int __init nohalt_setup(char * str) | |
219 | { | |
220 | pal_halt = can_do_pal_halt = 0; | |
221 | return 1; | |
222 | } | |
223 | __setup("nohalt", nohalt_setup); | |
224 | ||
225 | void | |
226 | update_pal_halt_status(int status) | |
227 | { | |
228 | can_do_pal_halt = pal_halt && status; | |
229 | } | |
230 | ||
231 | /* | |
232 | * We use this if we don't have any better idle routine.. | |
233 | */ | |
234 | void | |
235 | default_idle (void) | |
236 | { | |
237 | local_irq_enable(); | |
238 | while (!need_resched()) { | |
239 | if (can_do_pal_halt) { | |
240 | local_irq_disable(); | |
241 | if (!need_resched()) { | |
242 | safe_halt(); | |
243 | } | |
244 | local_irq_enable(); | |
245 | } else | |
246 | cpu_relax(); | |
247 | } | |
248 | } | |
249 | ||
250 | #ifdef CONFIG_HOTPLUG_CPU | |
251 | /* We don't actually take CPU down, just spin without interrupts. */ | |
252 | static inline void play_dead(void) | |
253 | { | |
254 | unsigned int this_cpu = smp_processor_id(); | |
255 | ||
256 | /* Ack it */ | |
257 | __get_cpu_var(cpu_state) = CPU_DEAD; | |
258 | ||
259 | max_xtp(); | |
260 | local_irq_disable(); | |
261 | idle_task_exit(); | |
262 | ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]); | |
263 | /* | |
264 | * The above is a point of no-return, the processor is | |
265 | * expected to be in SAL loop now. | |
266 | */ | |
267 | BUG(); | |
268 | } | |
269 | #else | |
270 | static inline void play_dead(void) | |
271 | { | |
272 | BUG(); | |
273 | } | |
274 | #endif /* CONFIG_HOTPLUG_CPU */ | |
275 | ||
276 | static void do_nothing(void *unused) | |
277 | { | |
278 | } | |
279 | ||
280 | /* | |
281 | * cpu_idle_wait - Used to ensure that all the CPUs discard old value of | |
282 | * pm_idle and update to new pm_idle value. Required while changing pm_idle | |
283 | * handler on SMP systems. | |
284 | * | |
285 | * Caller must have changed pm_idle to the new value before the call. Old | |
286 | * pm_idle value will not be used by any CPU after the return of this function. | |
287 | */ | |
288 | void cpu_idle_wait(void) | |
289 | { | |
290 | smp_mb(); | |
291 | /* kick all the CPUs so that they exit out of pm_idle */ | |
292 | smp_call_function(do_nothing, NULL, 1); | |
293 | } | |
294 | EXPORT_SYMBOL_GPL(cpu_idle_wait); | |
295 | ||
296 | void __attribute__((noreturn)) | |
297 | cpu_idle (void) | |
298 | { | |
299 | void (*mark_idle)(int) = ia64_mark_idle; | |
300 | int cpu = smp_processor_id(); | |
301 | ||
302 | /* endless idle loop with no priority at all */ | |
303 | while (1) { | |
304 | if (can_do_pal_halt) { | |
305 | current_thread_info()->status &= ~TS_POLLING; | |
306 | /* | |
307 | * TS_POLLING-cleared state must be visible before we | |
308 | * test NEED_RESCHED: | |
309 | */ | |
310 | smp_mb(); | |
311 | } else { | |
312 | current_thread_info()->status |= TS_POLLING; | |
313 | } | |
314 | ||
315 | if (!need_resched()) { | |
316 | void (*idle)(void); | |
317 | #ifdef CONFIG_SMP | |
318 | min_xtp(); | |
319 | #endif | |
320 | rmb(); | |
321 | if (mark_idle) | |
322 | (*mark_idle)(1); | |
323 | ||
324 | idle = pm_idle; | |
325 | if (!idle) | |
326 | idle = default_idle; | |
327 | (*idle)(); | |
328 | if (mark_idle) | |
329 | (*mark_idle)(0); | |
330 | #ifdef CONFIG_SMP | |
331 | normal_xtp(); | |
332 | #endif | |
333 | } | |
334 | preempt_enable_no_resched(); | |
335 | schedule(); | |
336 | preempt_disable(); | |
337 | check_pgt_cache(); | |
338 | if (cpu_is_offline(cpu)) | |
339 | play_dead(); | |
340 | } | |
341 | } | |
342 | ||
343 | void | |
344 | ia64_save_extra (struct task_struct *task) | |
345 | { | |
346 | #ifdef CONFIG_PERFMON | |
347 | unsigned long info; | |
348 | #endif | |
349 | ||
350 | if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0) | |
351 | ia64_save_debug_regs(&task->thread.dbr[0]); | |
352 | ||
353 | #ifdef CONFIG_PERFMON | |
354 | if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0) | |
355 | pfm_save_regs(task); | |
356 | ||
357 | info = __get_cpu_var(pfm_syst_info); | |
358 | if (info & PFM_CPUINFO_SYST_WIDE) | |
359 | pfm_syst_wide_update_task(task, info, 0); | |
360 | #endif | |
361 | ||
362 | #ifdef CONFIG_IA32_SUPPORT | |
363 | if (IS_IA32_PROCESS(task_pt_regs(task))) | |
364 | ia32_save_state(task); | |
365 | #endif | |
366 | } | |
367 | ||
368 | void | |
369 | ia64_load_extra (struct task_struct *task) | |
370 | { | |
371 | #ifdef CONFIG_PERFMON | |
372 | unsigned long info; | |
373 | #endif | |
374 | ||
375 | if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0) | |
376 | ia64_load_debug_regs(&task->thread.dbr[0]); | |
377 | ||
378 | #ifdef CONFIG_PERFMON | |
379 | if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0) | |
380 | pfm_load_regs(task); | |
381 | ||
382 | info = __get_cpu_var(pfm_syst_info); | |
383 | if (info & PFM_CPUINFO_SYST_WIDE) | |
384 | pfm_syst_wide_update_task(task, info, 1); | |
385 | #endif | |
386 | ||
387 | #ifdef CONFIG_IA32_SUPPORT | |
388 | if (IS_IA32_PROCESS(task_pt_regs(task))) | |
389 | ia32_load_state(task); | |
390 | #endif | |
391 | } | |
392 | ||
393 | /* | |
394 | * Copy the state of an ia-64 thread. | |
395 | * | |
396 | * We get here through the following call chain: | |
397 | * | |
398 | * from user-level: from kernel: | |
399 | * | |
400 | * <clone syscall> <some kernel call frames> | |
401 | * sys_clone : | |
402 | * do_fork do_fork | |
403 | * copy_thread copy_thread | |
404 | * | |
405 | * This means that the stack layout is as follows: | |
406 | * | |
407 | * +---------------------+ (highest addr) | |
408 | * | struct pt_regs | | |
409 | * +---------------------+ | |
410 | * | struct switch_stack | | |
411 | * +---------------------+ | |
412 | * | | | |
413 | * | memory stack | | |
414 | * | | <-- sp (lowest addr) | |
415 | * +---------------------+ | |
416 | * | |
417 | * Observe that we copy the unat values that are in pt_regs and switch_stack. Spilling an | |
418 | * integer to address X causes bit N in ar.unat to be set to the NaT bit of the register, | |
419 | * with N=(X & 0x1ff)/8. Thus, copying the unat value preserves the NaT bits ONLY if the | |
420 | * pt_regs structure in the parent is congruent to that of the child, modulo 512. Since | |
421 | * the stack is page aligned and the page size is at least 4KB, this is always the case, | |
422 | * so there is nothing to worry about. | |
423 | */ | |
424 | int | |
425 | copy_thread(unsigned long clone_flags, | |
426 | unsigned long user_stack_base, unsigned long user_stack_size, | |
427 | struct task_struct *p, struct pt_regs *regs) | |
428 | { | |
429 | extern char ia64_ret_from_clone, ia32_ret_from_clone; | |
430 | struct switch_stack *child_stack, *stack; | |
431 | unsigned long rbs, child_rbs, rbs_size; | |
432 | struct pt_regs *child_ptregs; | |
433 | int retval = 0; | |
434 | ||
435 | #ifdef CONFIG_SMP | |
436 | /* | |
437 | * For SMP idle threads, fork_by_hand() calls do_fork with | |
438 | * NULL regs. | |
439 | */ | |
440 | if (!regs) | |
441 | return 0; | |
442 | #endif | |
443 | ||
444 | stack = ((struct switch_stack *) regs) - 1; | |
445 | ||
446 | child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1; | |
447 | child_stack = (struct switch_stack *) child_ptregs - 1; | |
448 | ||
449 | /* copy parent's switch_stack & pt_regs to child: */ | |
450 | memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack)); | |
451 | ||
452 | rbs = (unsigned long) current + IA64_RBS_OFFSET; | |
453 | child_rbs = (unsigned long) p + IA64_RBS_OFFSET; | |
454 | rbs_size = stack->ar_bspstore - rbs; | |
455 | ||
456 | /* copy the parent's register backing store to the child: */ | |
457 | memcpy((void *) child_rbs, (void *) rbs, rbs_size); | |
458 | ||
459 | if (likely(user_mode(child_ptregs))) { | |
460 | if ((clone_flags & CLONE_SETTLS) && !IS_IA32_PROCESS(regs)) | |
461 | child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */ | |
462 | if (user_stack_base) { | |
463 | child_ptregs->r12 = user_stack_base + user_stack_size - 16; | |
464 | child_ptregs->ar_bspstore = user_stack_base; | |
465 | child_ptregs->ar_rnat = 0; | |
466 | child_ptregs->loadrs = 0; | |
467 | } | |
468 | } else { | |
469 | /* | |
470 | * Note: we simply preserve the relative position of | |
471 | * the stack pointer here. There is no need to | |
472 | * allocate a scratch area here, since that will have | |
473 | * been taken care of by the caller of sys_clone() | |
474 | * already. | |
475 | */ | |
476 | child_ptregs->r12 = (unsigned long) child_ptregs - 16; /* kernel sp */ | |
477 | child_ptregs->r13 = (unsigned long) p; /* set `current' pointer */ | |
478 | } | |
479 | child_stack->ar_bspstore = child_rbs + rbs_size; | |
480 | if (IS_IA32_PROCESS(regs)) | |
481 | child_stack->b0 = (unsigned long) &ia32_ret_from_clone; | |
482 | else | |
483 | child_stack->b0 = (unsigned long) &ia64_ret_from_clone; | |
484 | ||
485 | /* copy parts of thread_struct: */ | |
486 | p->thread.ksp = (unsigned long) child_stack - 16; | |
487 | ||
488 | /* stop some PSR bits from being inherited. | |
489 | * the psr.up/psr.pp bits must be cleared on fork but inherited on execve() | |
490 | * therefore we must specify them explicitly here and not include them in | |
491 | * IA64_PSR_BITS_TO_CLEAR. | |
492 | */ | |
493 | child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) | |
494 | & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); | |
495 | ||
496 | /* | |
497 | * NOTE: The calling convention considers all floating point | |
498 | * registers in the high partition (fph) to be scratch. Since | |
499 | * the only way to get to this point is through a system call, | |
500 | * we know that the values in fph are all dead. Hence, there | |
501 | * is no need to inherit the fph state from the parent to the | |
502 | * child and all we have to do is to make sure that | |
503 | * IA64_THREAD_FPH_VALID is cleared in the child. | |
504 | * | |
505 | * XXX We could push this optimization a bit further by | |
506 | * clearing IA64_THREAD_FPH_VALID on ANY system call. | |
507 | * However, it's not clear this is worth doing. Also, it | |
508 | * would be a slight deviation from the normal Linux system | |
509 | * call behavior where scratch registers are preserved across | |
510 | * system calls (unless used by the system call itself). | |
511 | */ | |
512 | # define THREAD_FLAGS_TO_CLEAR (IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID \ | |
513 | | IA64_THREAD_PM_VALID) | |
514 | # define THREAD_FLAGS_TO_SET 0 | |
515 | p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR) | |
516 | | THREAD_FLAGS_TO_SET); | |
517 | ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */ | |
518 | #ifdef CONFIG_IA32_SUPPORT | |
519 | /* | |
520 | * If we're cloning an IA32 task then save the IA32 extra | |
521 | * state from the current task to the new task | |
522 | */ | |
523 | if (IS_IA32_PROCESS(task_pt_regs(current))) { | |
524 | ia32_save_state(p); | |
525 | if (clone_flags & CLONE_SETTLS) | |
526 | retval = ia32_clone_tls(p, child_ptregs); | |
527 | ||
528 | /* Copy partially mapped page list */ | |
529 | if (!retval) | |
530 | retval = ia32_copy_ia64_partial_page_list(p, | |
531 | clone_flags); | |
532 | } | |
533 | #endif | |
534 | ||
535 | #ifdef CONFIG_PERFMON | |
536 | if (current->thread.pfm_context) | |
537 | pfm_inherit(p, child_ptregs); | |
538 | #endif | |
539 | return retval; | |
540 | } | |
541 | ||
542 | static void | |
543 | do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg) | |
544 | { | |
545 | unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm; | |
546 | unsigned long uninitialized_var(ip); /* GCC be quiet */ | |
547 | elf_greg_t *dst = arg; | |
548 | struct pt_regs *pt; | |
549 | char nat; | |
550 | int i; | |
551 | ||
552 | memset(dst, 0, sizeof(elf_gregset_t)); /* don't leak any kernel bits to user-level */ | |
553 | ||
554 | if (unw_unwind_to_user(info) < 0) | |
555 | return; | |
556 | ||
557 | unw_get_sp(info, &sp); | |
558 | pt = (struct pt_regs *) (sp + 16); | |
559 | ||
560 | urbs_end = ia64_get_user_rbs_end(task, pt, &cfm); | |
561 | ||
562 | if (ia64_sync_user_rbs(task, info->sw, pt->ar_bspstore, urbs_end) < 0) | |
563 | return; | |
564 | ||
565 | ia64_peek(task, info->sw, urbs_end, (long) ia64_rse_rnat_addr((long *) urbs_end), | |
566 | &ar_rnat); | |
567 | ||
568 | /* | |
569 | * coredump format: | |
570 | * r0-r31 | |
571 | * NaT bits (for r0-r31; bit N == 1 iff rN is a NaT) | |
572 | * predicate registers (p0-p63) | |
573 | * b0-b7 | |
574 | * ip cfm user-mask | |
575 | * ar.rsc ar.bsp ar.bspstore ar.rnat | |
576 | * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec | |
577 | */ | |
578 | ||
579 | /* r0 is zero */ | |
580 | for (i = 1, mask = (1UL << i); i < 32; ++i) { | |
581 | unw_get_gr(info, i, &dst[i], &nat); | |
582 | if (nat) | |
583 | nat_bits |= mask; | |
584 | mask <<= 1; | |
585 | } | |
586 | dst[32] = nat_bits; | |
587 | unw_get_pr(info, &dst[33]); | |
588 | ||
589 | for (i = 0; i < 8; ++i) | |
590 | unw_get_br(info, i, &dst[34 + i]); | |
591 | ||
592 | unw_get_rp(info, &ip); | |
593 | dst[42] = ip + ia64_psr(pt)->ri; | |
594 | dst[43] = cfm; | |
595 | dst[44] = pt->cr_ipsr & IA64_PSR_UM; | |
596 | ||
597 | unw_get_ar(info, UNW_AR_RSC, &dst[45]); | |
598 | /* | |
599 | * For bsp and bspstore, unw_get_ar() would return the kernel | |
600 | * addresses, but we need the user-level addresses instead: | |
601 | */ | |
602 | dst[46] = urbs_end; /* note: by convention PT_AR_BSP points to the end of the urbs! */ | |
603 | dst[47] = pt->ar_bspstore; | |
604 | dst[48] = ar_rnat; | |
605 | unw_get_ar(info, UNW_AR_CCV, &dst[49]); | |
606 | unw_get_ar(info, UNW_AR_UNAT, &dst[50]); | |
607 | unw_get_ar(info, UNW_AR_FPSR, &dst[51]); | |
608 | dst[52] = pt->ar_pfs; /* UNW_AR_PFS is == to pt->cr_ifs for interrupt frames */ | |
609 | unw_get_ar(info, UNW_AR_LC, &dst[53]); | |
610 | unw_get_ar(info, UNW_AR_EC, &dst[54]); | |
611 | unw_get_ar(info, UNW_AR_CSD, &dst[55]); | |
612 | unw_get_ar(info, UNW_AR_SSD, &dst[56]); | |
613 | } | |
614 | ||
615 | void | |
616 | do_dump_task_fpu (struct task_struct *task, struct unw_frame_info *info, void *arg) | |
617 | { | |
618 | elf_fpreg_t *dst = arg; | |
619 | int i; | |
620 | ||
621 | memset(dst, 0, sizeof(elf_fpregset_t)); /* don't leak any "random" bits */ | |
622 | ||
623 | if (unw_unwind_to_user(info) < 0) | |
624 | return; | |
625 | ||
626 | /* f0 is 0.0, f1 is 1.0 */ | |
627 | ||
628 | for (i = 2; i < 32; ++i) | |
629 | unw_get_fr(info, i, dst + i); | |
630 | ||
631 | ia64_flush_fph(task); | |
632 | if ((task->thread.flags & IA64_THREAD_FPH_VALID) != 0) | |
633 | memcpy(dst + 32, task->thread.fph, 96*16); | |
634 | } | |
635 | ||
636 | void | |
637 | do_copy_regs (struct unw_frame_info *info, void *arg) | |
638 | { | |
639 | do_copy_task_regs(current, info, arg); | |
640 | } | |
641 | ||
642 | void | |
643 | do_dump_fpu (struct unw_frame_info *info, void *arg) | |
644 | { | |
645 | do_dump_task_fpu(current, info, arg); | |
646 | } | |
647 | ||
648 | void | |
649 | ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst) | |
650 | { | |
651 | unw_init_running(do_copy_regs, dst); | |
652 | } | |
653 | ||
654 | int | |
655 | dump_fpu (struct pt_regs *pt, elf_fpregset_t dst) | |
656 | { | |
657 | unw_init_running(do_dump_fpu, dst); | |
658 | return 1; /* f0-f31 are always valid so we always return 1 */ | |
659 | } | |
660 | ||
661 | long | |
662 | sys_execve (char __user *filename, char __user * __user *argv, char __user * __user *envp, | |
663 | struct pt_regs *regs) | |
664 | { | |
665 | char *fname; | |
666 | int error; | |
667 | ||
668 | fname = getname(filename); | |
669 | error = PTR_ERR(fname); | |
670 | if (IS_ERR(fname)) | |
671 | goto out; | |
672 | error = do_execve(fname, argv, envp, regs); | |
673 | putname(fname); | |
674 | out: | |
675 | return error; | |
676 | } | |
677 | ||
678 | pid_t | |
679 | kernel_thread (int (*fn)(void *), void *arg, unsigned long flags) | |
680 | { | |
681 | extern void start_kernel_thread (void); | |
682 | unsigned long *helper_fptr = (unsigned long *) &start_kernel_thread; | |
683 | struct { | |
684 | struct switch_stack sw; | |
685 | struct pt_regs pt; | |
686 | } regs; | |
687 | ||
688 | memset(®s, 0, sizeof(regs)); | |
689 | regs.pt.cr_iip = helper_fptr[0]; /* set entry point (IP) */ | |
690 | regs.pt.r1 = helper_fptr[1]; /* set GP */ | |
691 | regs.pt.r9 = (unsigned long) fn; /* 1st argument */ | |
692 | regs.pt.r11 = (unsigned long) arg; /* 2nd argument */ | |
693 | /* Preserve PSR bits, except for bits 32-34 and 37-45, which we can't read. */ | |
694 | regs.pt.cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN; | |
695 | regs.pt.cr_ifs = 1UL << 63; /* mark as valid, empty frame */ | |
696 | regs.sw.ar_fpsr = regs.pt.ar_fpsr = ia64_getreg(_IA64_REG_AR_FPSR); | |
697 | regs.sw.ar_bspstore = (unsigned long) current + IA64_RBS_OFFSET; | |
698 | regs.sw.pr = (1 << PRED_KERNEL_STACK); | |
699 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s.pt, 0, NULL, NULL); | |
700 | } | |
701 | EXPORT_SYMBOL(kernel_thread); | |
702 | ||
703 | /* This gets called from kernel_thread() via ia64_invoke_thread_helper(). */ | |
704 | int | |
705 | kernel_thread_helper (int (*fn)(void *), void *arg) | |
706 | { | |
707 | #ifdef CONFIG_IA32_SUPPORT | |
708 | if (IS_IA32_PROCESS(task_pt_regs(current))) { | |
709 | /* A kernel thread is always a 64-bit process. */ | |
710 | current->thread.map_base = DEFAULT_MAP_BASE; | |
711 | current->thread.task_size = DEFAULT_TASK_SIZE; | |
712 | ia64_set_kr(IA64_KR_IO_BASE, current->thread.old_iob); | |
713 | ia64_set_kr(IA64_KR_TSSD, current->thread.old_k1); | |
714 | } | |
715 | #endif | |
716 | return (*fn)(arg); | |
717 | } | |
718 | ||
719 | /* | |
720 | * Flush thread state. This is called when a thread does an execve(). | |
721 | */ | |
722 | void | |
723 | flush_thread (void) | |
724 | { | |
725 | /* drop floating-point and debug-register state if it exists: */ | |
726 | current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID); | |
727 | ia64_drop_fpu(current); | |
728 | #ifdef CONFIG_IA32_SUPPORT | |
729 | if (IS_IA32_PROCESS(task_pt_regs(current))) { | |
730 | ia32_drop_ia64_partial_page_list(current); | |
731 | current->thread.task_size = IA32_PAGE_OFFSET; | |
732 | set_fs(USER_DS); | |
733 | memset(current->thread.tls_array, 0, sizeof(current->thread.tls_array)); | |
734 | } | |
735 | #endif | |
736 | } | |
737 | ||
738 | /* | |
739 | * Clean up state associated with current thread. This is called when | |
740 | * the thread calls exit(). | |
741 | */ | |
742 | void | |
743 | exit_thread (void) | |
744 | { | |
745 | ||
746 | ia64_drop_fpu(current); | |
747 | #ifdef CONFIG_PERFMON | |
748 | /* if needed, stop monitoring and flush state to perfmon context */ | |
749 | if (current->thread.pfm_context) | |
750 | pfm_exit_thread(current); | |
751 | ||
752 | /* free debug register resources */ | |
753 | if (current->thread.flags & IA64_THREAD_DBG_VALID) | |
754 | pfm_release_debug_registers(current); | |
755 | #endif | |
756 | if (IS_IA32_PROCESS(task_pt_regs(current))) | |
757 | ia32_drop_ia64_partial_page_list(current); | |
758 | } | |
759 | ||
760 | unsigned long | |
761 | get_wchan (struct task_struct *p) | |
762 | { | |
763 | struct unw_frame_info info; | |
764 | unsigned long ip; | |
765 | int count = 0; | |
766 | ||
767 | if (!p || p == current || p->state == TASK_RUNNING) | |
768 | return 0; | |
769 | ||
770 | /* | |
771 | * Note: p may not be a blocked task (it could be current or | |
772 | * another process running on some other CPU. Rather than | |
773 | * trying to determine if p is really blocked, we just assume | |
774 | * it's blocked and rely on the unwind routines to fail | |
775 | * gracefully if the process wasn't really blocked after all. | |
776 | * --davidm 99/12/15 | |
777 | */ | |
778 | unw_init_from_blocked_task(&info, p); | |
779 | do { | |
780 | if (p->state == TASK_RUNNING) | |
781 | return 0; | |
782 | if (unw_unwind(&info) < 0) | |
783 | return 0; | |
784 | unw_get_ip(&info, &ip); | |
785 | if (!in_sched_functions(ip)) | |
786 | return ip; | |
787 | } while (count++ < 16); | |
788 | return 0; | |
789 | } | |
790 | ||
791 | void | |
792 | cpu_halt (void) | |
793 | { | |
794 | pal_power_mgmt_info_u_t power_info[8]; | |
795 | unsigned long min_power; | |
796 | int i, min_power_state; | |
797 | ||
798 | if (ia64_pal_halt_info(power_info) != 0) | |
799 | return; | |
800 | ||
801 | min_power_state = 0; | |
802 | min_power = power_info[0].pal_power_mgmt_info_s.power_consumption; | |
803 | for (i = 1; i < 8; ++i) | |
804 | if (power_info[i].pal_power_mgmt_info_s.im | |
805 | && power_info[i].pal_power_mgmt_info_s.power_consumption < min_power) { | |
806 | min_power = power_info[i].pal_power_mgmt_info_s.power_consumption; | |
807 | min_power_state = i; | |
808 | } | |
809 | ||
810 | while (1) | |
811 | ia64_pal_halt(min_power_state); | |
812 | } | |
813 | ||
814 | void machine_shutdown(void) | |
815 | { | |
816 | #ifdef CONFIG_HOTPLUG_CPU | |
817 | int cpu; | |
818 | ||
819 | for_each_online_cpu(cpu) { | |
820 | if (cpu != smp_processor_id()) | |
821 | cpu_down(cpu); | |
822 | } | |
823 | #endif | |
824 | #ifdef CONFIG_KEXEC | |
825 | kexec_disable_iosapic(); | |
826 | #endif | |
827 | } | |
828 | ||
829 | void | |
830 | machine_restart (char *restart_cmd) | |
831 | { | |
832 | (void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0); | |
833 | (*efi.reset_system)(EFI_RESET_WARM, 0, 0, NULL); | |
834 | } | |
835 | ||
836 | void | |
837 | machine_halt (void) | |
838 | { | |
839 | (void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0); | |
840 | cpu_halt(); | |
841 | } | |
842 | ||
843 | void | |
844 | machine_power_off (void) | |
845 | { | |
846 | if (pm_power_off) | |
847 | pm_power_off(); | |
848 | machine_halt(); | |
849 | } | |
850 |