Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/process.c | |
3 | * | |
4 | * Copyright (C) 1996-2000 Russell King - Converted to ARM. | |
5 | * Original Copyright (C) 1995 Linus Torvalds | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <stdarg.h> | |
12 | ||
ecea4ab6 | 13 | #include <linux/export.h> |
1da177e4 LT |
14 | #include <linux/sched.h> |
15 | #include <linux/kernel.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/stddef.h> | |
18 | #include <linux/unistd.h> | |
1da177e4 | 19 | #include <linux/user.h> |
1da177e4 LT |
20 | #include <linux/delay.h> |
21 | #include <linux/reboot.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/kallsyms.h> | |
24 | #include <linux/init.h> | |
a054a811 | 25 | #include <linux/cpu.h> |
84dff1a7 | 26 | #include <linux/elfcore.h> |
74617fb6 | 27 | #include <linux/pm.h> |
9e4559dd | 28 | #include <linux/tick.h> |
154c772e | 29 | #include <linux/utsname.h> |
33fa9b13 | 30 | #include <linux/uaccess.h> |
990cb8ac | 31 | #include <linux/random.h> |
864232fa | 32 | #include <linux/hw_breakpoint.h> |
a0bfa137 | 33 | #include <linux/cpuidle.h> |
fa8bbb13 | 34 | #include <linux/leds.h> |
6fa3eb70 S |
35 | #include <linux/console.h> |
36 | #include <linux/mtk_ram_console.h> | |
1da177e4 | 37 | |
9ca03a21 | 38 | #include <asm/cacheflush.h> |
9ecb47de | 39 | #include <asm/idmap.h> |
1da177e4 | 40 | #include <asm/processor.h> |
d6551e88 | 41 | #include <asm/thread_notify.h> |
2d7c11bf | 42 | #include <asm/stacktrace.h> |
2ea83398 | 43 | #include <asm/mach/time.h> |
4b9e9796 | 44 | #include <asm/tls.h> |
6fa3eb70 | 45 | #include <mach/system.h> |
1da177e4 | 46 | |
c743f380 NP |
47 | #ifdef CONFIG_CC_STACKPROTECTOR |
48 | #include <linux/stackprotector.h> | |
49 | unsigned long __stack_chk_guard __read_mostly; | |
50 | EXPORT_SYMBOL(__stack_chk_guard); | |
51 | #endif | |
52 | ||
ae0a846e RK |
53 | static const char *processor_modes[] = { |
54 | "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , | |
55 | "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26", | |
56 | "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" , | |
57 | "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32" | |
58 | }; | |
59 | ||
909d6c6c GD |
60 | static const char *isa_modes[] = { |
61 | "ARM" , "Thumb" , "Jazelle", "ThumbEE" | |
62 | }; | |
63 | ||
4b9e9796 S |
64 | //[BUGFIX]-Add-BEGIN by SCDTABLET.(fangyou.wang),10/10/2015,1097303, |
65 | //auto reboot after power off | |
66 | extern void force_enable_uart_log(void); | |
67 | //[BUGFIX]-Add-END by SCDTABLET.(fangyou.wang) | |
6fa3eb70 S |
68 | #ifdef CONFIG_SMP |
69 | void arch_trigger_all_cpu_backtrace(void) | |
70 | { | |
71 | smp_send_all_cpu_backtrace(); | |
72 | } | |
73 | #else | |
74 | void arch_trigger_all_cpu_backtrace(void) | |
75 | { | |
76 | dump_stack(); | |
77 | } | |
78 | #endif | |
79 | ||
290130a1 WD |
80 | extern void call_with_stack(void (*fn)(void *), void *arg, void *sp); |
81 | typedef void (*phys_reset_t)(unsigned long); | |
82 | ||
6fa3eb70 S |
83 | #ifdef CONFIG_ARM_FLUSH_CONSOLE_ON_RESTART |
84 | void arm_machine_flush_console(void) | |
85 | { | |
86 | printk("\n"); | |
87 | pr_emerg("Restarting %s\n", linux_banner); | |
88 | if (console_trylock()) { | |
89 | console_unlock(); | |
90 | return; | |
91 | } | |
92 | ||
93 | mdelay(50); | |
94 | ||
95 | local_irq_disable(); | |
96 | if (!console_trylock()) | |
97 | pr_emerg("arm_restart: Console was locked! Busting\n"); | |
98 | else | |
99 | pr_emerg("arm_restart: Console was locked!\n"); | |
100 | console_unlock(); | |
101 | } | |
102 | #else | |
103 | void arm_machine_flush_console(void) | |
104 | { | |
105 | } | |
106 | #endif | |
107 | ||
290130a1 WD |
108 | /* |
109 | * A temporary stack to use for CPU reset. This is static so that we | |
110 | * don't clobber it with the identity mapping. When running with this | |
111 | * stack, any references to the current task *will not work* so you | |
112 | * should really do as little as possible before jumping to your reset | |
113 | * code. | |
114 | */ | |
115 | static u64 soft_restart_stack[16]; | |
116 | ||
6fa3eb70 S |
117 | void arm_machine_restart(char mode, const char *cmd) |
118 | { | |
119 | /* Flush the console to make sure all the relevant messages make it | |
120 | * out to the console drivers */ | |
121 | arm_machine_flush_console(); | |
122 | ||
123 | /* Disable interrupts first */ | |
124 | local_irq_disable(); | |
125 | local_fiq_disable(); | |
126 | ||
127 | /* | |
128 | * Tell the mm system that we are going to reboot - | |
129 | * we may need it to insert some 1:1 mappings so that | |
130 | * soft boot works. | |
131 | */ | |
132 | setup_mm_for_reboot(); | |
133 | ||
134 | /* When l1 is disabled and l2 is enabled, the spinlock cannot get the lock, | |
135 | * so we need to disable the l2 as well. by Chia-Hao Hsu | |
136 | */ | |
137 | outer_flush_all(); | |
138 | outer_disable(); | |
139 | outer_flush_all(); | |
140 | ||
141 | /* Clean and invalidate caches */ | |
142 | flush_cache_all(); | |
143 | #ifdef CONFIG_RESTART_DISABLE_CACHE | |
144 | /* Turn off caching */ | |
145 | // cpu_proc_fin(); // Don't turn off cach during reboot phase. CA15 have risk if turn off cach. | |
146 | #endif | |
147 | /* Push out any further dirty data, and ensure cache is empty */ | |
148 | flush_cache_all(); | |
149 | ||
150 | /* | |
151 | * Now call the architecture specific reboot code. | |
152 | */ | |
153 | arch_reset(mode, cmd); | |
154 | ||
155 | /* | |
156 | * Whoops - the architecture was unable to reboot. | |
157 | * Tell the user! | |
158 | */ | |
159 | mdelay(1000); | |
160 | printk("Reboot failed -- System halted\n"); | |
161 | while (1); | |
162 | } | |
163 | ||
290130a1 | 164 | static void __soft_restart(void *addr) |
74617fb6 | 165 | { |
290130a1 | 166 | phys_reset_t phys_reset; |
74617fb6 | 167 | |
290130a1 | 168 | /* Take out a flat memory mapping. */ |
5aafec15 | 169 | setup_mm_for_reboot(); |
74617fb6 | 170 | |
9ca03a21 RK |
171 | /* Clean and invalidate caches */ |
172 | flush_cache_all(); | |
173 | ||
174 | /* Turn off caching */ | |
175 | cpu_proc_fin(); | |
176 | ||
177 | /* Push out any further dirty data, and ensure cache is empty */ | |
178 | flush_cache_all(); | |
179 | ||
290130a1 WD |
180 | /* Switch to the identity mapping. */ |
181 | phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset); | |
182 | phys_reset((unsigned long)addr); | |
74617fb6 | 183 | |
290130a1 WD |
184 | /* Should never get here. */ |
185 | BUG(); | |
186 | } | |
187 | ||
188 | void soft_restart(unsigned long addr) | |
189 | { | |
190 | u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack); | |
191 | ||
192 | /* Disable interrupts first */ | |
193 | local_irq_disable(); | |
194 | local_fiq_disable(); | |
195 | ||
196 | /* Disable the L2 if we're the last man standing. */ | |
6fa3eb70 S |
197 | if (num_online_cpus() == 1) { |
198 | outer_flush_all(); | |
290130a1 | 199 | outer_disable(); |
6fa3eb70 | 200 | } |
290130a1 WD |
201 | |
202 | /* Change to the new stack and continue with the reset. */ | |
203 | call_with_stack(__soft_restart, (void *)addr, (void *)stack); | |
204 | ||
205 | /* Should never get here. */ | |
206 | BUG(); | |
e879c862 RK |
207 | } |
208 | ||
f88b8979 | 209 | static void null_restart(char mode, const char *cmd) |
e879c862 | 210 | { |
74617fb6 RP |
211 | } |
212 | ||
1da177e4 | 213 | /* |
74617fb6 | 214 | * Function pointers to optional machine specific functions |
1da177e4 | 215 | */ |
1da177e4 LT |
216 | void (*pm_power_off)(void); |
217 | EXPORT_SYMBOL(pm_power_off); | |
218 | ||
f88b8979 | 219 | void (*arm_pm_restart)(char str, const char *cmd) = null_restart; |
74617fb6 RP |
220 | EXPORT_SYMBOL_GPL(arm_pm_restart); |
221 | ||
1da177e4 | 222 | /* |
4fa20439 | 223 | * This is our default idle handler. |
1da177e4 | 224 | */ |
4fa20439 NP |
225 | |
226 | void (*arm_pm_idle)(void); | |
227 | ||
84dff1a7 | 228 | static void default_idle(void) |
1da177e4 | 229 | { |
4fa20439 NP |
230 | if (arm_pm_idle) |
231 | arm_pm_idle(); | |
232 | else | |
ae940913 | 233 | cpu_do_idle(); |
9ccdac36 | 234 | local_irq_enable(); |
1da177e4 LT |
235 | } |
236 | ||
f7b861b7 | 237 | void arch_cpu_idle_prepare(void) |
1da177e4 LT |
238 | { |
239 | local_fiq_enable(); | |
f7b861b7 | 240 | } |
1da177e4 | 241 | |
f7b861b7 TG |
242 | void arch_cpu_idle_enter(void) |
243 | { | |
6fa3eb70 | 244 | idle_notifier_call_chain(IDLE_START); |
f7b861b7 TG |
245 | ledtrig_cpu(CPU_LED_IDLE_START); |
246 | #ifdef CONFIG_PL310_ERRATA_769419 | |
247 | wmb(); | |
a054a811 | 248 | #endif |
f7b861b7 | 249 | } |
a054a811 | 250 | |
f7b861b7 TG |
251 | void arch_cpu_idle_exit(void) |
252 | { | |
253 | ledtrig_cpu(CPU_LED_IDLE_END); | |
6fa3eb70 | 254 | idle_notifier_call_chain(IDLE_END); |
f7b861b7 TG |
255 | } |
256 | ||
257 | #ifdef CONFIG_HOTPLUG_CPU | |
258 | void arch_cpu_idle_dead(void) | |
259 | { | |
260 | cpu_die(); | |
261 | } | |
11ed0ba1 | 262 | #endif |
f7b861b7 TG |
263 | |
264 | /* | |
265 | * Called from the core idle loop. | |
266 | */ | |
267 | void arch_cpu_idle(void) | |
268 | { | |
269 | if (cpuidle_idle_call()) | |
270 | default_idle(); | |
1da177e4 LT |
271 | } |
272 | ||
273 | static char reboot_mode = 'h'; | |
274 | ||
275 | int __init reboot_setup(char *str) | |
276 | { | |
277 | reboot_mode = str[0]; | |
278 | return 1; | |
279 | } | |
280 | ||
281 | __setup("reboot=", reboot_setup); | |
282 | ||
19ab428f SW |
283 | /* |
284 | * Called by kexec, immediately prior to machine_kexec(). | |
285 | * | |
286 | * This must completely disable all secondary CPUs; simply causing those CPUs | |
287 | * to execute e.g. a RAM-based pin loop is not sufficient. This allows the | |
288 | * kexec'd kernel to use any and all RAM as it sees fit, without having to | |
289 | * avoid any code or data used by any SW CPU pin loop. The CPU hotplug | |
290 | * functionality embodied in disable_nonboot_cpus() to achieve this. | |
291 | */ | |
3d3f78d7 | 292 | void machine_shutdown(void) |
1da177e4 | 293 | { |
6fa3eb70 S |
294 | #ifdef CONFIG_SMP |
295 | /* | |
296 | * Disable preemption so we're guaranteed to | |
297 | * run to power off or reboot and prevent | |
298 | * the possibility of switching to another | |
299 | * thread that might wind up blocking on | |
300 | * one of the stopped CPUs. | |
301 | */ | |
302 | printk("machine_shutdown: start, Proess(%s:%d)\n", current->comm, current->pid); | |
303 | dump_stack(); | |
304 | preempt_disable(); | |
305 | #endif | |
19ab428f | 306 | disable_nonboot_cpus(); |
6fa3eb70 | 307 | printk("machine_shutdown: done\n"); |
1da177e4 LT |
308 | } |
309 | ||
19ab428f SW |
310 | /* |
311 | * Halting simply requires that the secondary CPUs stop performing any | |
312 | * activity (executing tasks, handling interrupts). smp_send_stop() | |
313 | * achieves this. | |
314 | */ | |
3d3f78d7 RK |
315 | void machine_halt(void) |
316 | { | |
19ab428f SW |
317 | smp_send_stop(); |
318 | ||
98bd8b96 | 319 | local_irq_disable(); |
3d3f78d7 RK |
320 | while (1); |
321 | } | |
1da177e4 | 322 | |
6fa3eb70 | 323 | extern int reboot_pid; |
19ab428f SW |
324 | /* |
325 | * Power-off simply requires that the secondary CPUs stop performing any | |
326 | * activity (executing tasks, handling interrupts). smp_send_stop() | |
327 | * achieves this. When the system power is turned off, it will take all CPUs | |
328 | * with it. | |
329 | */ | |
1da177e4 LT |
330 | void machine_power_off(void) |
331 | { | |
6fa3eb70 S |
332 | struct task_struct *tsk; |
333 | ||
334 | /* Disable interrupts first */ | |
335 | local_irq_disable(); | |
336 | local_fiq_disable(); | |
4b9e9796 S |
337 | //[BUGFIX]-Add-BEGIN by SCDTABLET.(fangyou.wang),10/10/2015,1097303, |
338 | //auto reboot after power off | |
339 | force_enable_uart_log(); | |
340 | //[BUGFIX]-Add-END by SCDTABLET.(fangyou.wang) | |
341 | ||
6fa3eb70 S |
342 | smp_send_stop(); |
343 | if(reboot_pid > 1) | |
344 | { | |
345 | tsk = find_task_by_vpid(reboot_pid); | |
346 | if(tsk == NULL) | |
347 | tsk = current; | |
348 | dump_stack(); | |
349 | } | |
350 | else | |
351 | { | |
352 | tsk = current; | |
353 | } | |
354 | ||
355 | if(tsk->real_parent) | |
356 | { | |
357 | if(tsk->real_parent->real_parent) | |
358 | { | |
359 | printk("machine_shutdown: start, Proess(%s:%d). father %s:%d. grandfather %s:%d.\n", | |
360 | tsk->comm, tsk->pid,tsk->real_parent->comm,tsk->real_parent->pid, | |
361 | tsk->real_parent->real_parent->comm,tsk->real_parent->real_parent->pid); | |
362 | } | |
363 | else | |
364 | { | |
365 | printk("machine_shutdown: start, Proess(%s:%d). father %s:%d.\n", | |
366 | tsk->comm, tsk->pid,tsk->real_parent->comm,tsk->real_parent->pid); | |
367 | } | |
368 | } | |
369 | else | |
370 | { | |
371 | printk("machine_shutdown: start, Proess(%s:%d)\n", tsk->comm, tsk->pid); | |
372 | } | |
373 | ||
374 | #ifdef CONFIG_MTK_EMMC_SUPPORT | |
375 | last_kmsg_store_to_emmc(); | |
376 | #endif | |
19ab428f | 377 | |
1da177e4 LT |
378 | if (pm_power_off) |
379 | pm_power_off(); | |
380 | } | |
381 | ||
19ab428f SW |
382 | /* |
383 | * Restart requires that the secondary CPUs stop performing any activity | |
384 | * while the primary CPU resets the system. Systems with a single CPU can | |
385 | * use soft_restart() as their machine descriptor's .restart hook, since that | |
386 | * will cause the only available CPU to reset. Systems with multiple CPUs must | |
387 | * provide a HW restart implementation, to ensure that all CPUs reset at once. | |
388 | * This is required so that any code running after reset on the primary CPU | |
389 | * doesn't have to co-ordinate with other CPUs to ensure they aren't still | |
390 | * executing pre-reset code, and using RAM that the primary CPU's code wishes | |
391 | * to use. Implementing such co-ordination would be essentially impossible. | |
392 | */ | |
be093beb | 393 | void machine_restart(char *cmd) |
1da177e4 | 394 | { |
6fa3eb70 S |
395 | struct task_struct *tsk; |
396 | /* Disable interrupts first */ | |
397 | local_irq_disable(); | |
398 | local_fiq_disable(); | |
399 | ||
19ab428f | 400 | smp_send_stop(); |
ac15e00b | 401 | |
6fa3eb70 S |
402 | if(reboot_pid > 1) |
403 | { | |
404 | tsk = find_task_by_vpid(reboot_pid); | |
405 | if(tsk == NULL) | |
406 | tsk = current; | |
407 | dump_stack(); | |
408 | } | |
409 | else | |
410 | { | |
411 | tsk = current; | |
412 | } | |
413 | ||
414 | if(tsk->real_parent) | |
415 | { | |
416 | if(tsk->real_parent->real_parent) | |
417 | { | |
418 | printk("machine_shutdown: start, Proess(%s:%d). father %s:%d. grandfather %s:%d.\n", | |
419 | tsk->comm, tsk->pid,tsk->real_parent->comm,tsk->real_parent->pid, | |
420 | tsk->real_parent->real_parent->comm,tsk->real_parent->real_parent->pid); | |
421 | } | |
422 | else | |
423 | { | |
424 | printk("machine_shutdown: start, Proess(%s:%d). father %s:%d.\n", | |
425 | tsk->comm, tsk->pid,tsk->real_parent->comm,tsk->real_parent->pid); | |
426 | } | |
427 | } | |
428 | else | |
429 | { | |
430 | printk("machine_shutdown: start, Proess(%s:%d)\n", tsk->comm, tsk->pid); | |
431 | } | |
432 | ||
433 | /* Flush the console to make sure all the relevant messages make it | |
434 | * out to the console drivers */ | |
435 | arm_machine_flush_console(); | |
436 | ||
be093beb | 437 | arm_pm_restart(reboot_mode, cmd); |
ac15e00b RK |
438 | |
439 | /* Give a grace period for failure to restart of 1s */ | |
440 | mdelay(1000); | |
441 | ||
442 | /* Whoops - the platform was unable to reboot. Tell the user! */ | |
443 | printk("Reboot failed -- System halted\n"); | |
98bd8b96 | 444 | local_irq_disable(); |
ac15e00b | 445 | while (1); |
1da177e4 LT |
446 | } |
447 | ||
6fa3eb70 S |
448 | /* |
449 | * dump a block of kernel memory from around the given address | |
450 | */ | |
451 | static void show_data(unsigned long addr, int nbytes, const char *name) | |
452 | { | |
453 | int i, j; | |
454 | int nlines; | |
455 | u32 *p; | |
456 | ||
457 | /* | |
458 | * don't attempt to dump non-kernel addresses or | |
459 | * values that are probably just small negative numbers | |
460 | */ | |
461 | if (addr < PAGE_OFFSET || addr > -256UL) | |
462 | return; | |
463 | ||
464 | printk("\n%s: %#lx:\n", name, addr); | |
465 | ||
466 | /* | |
467 | * round address down to a 32 bit boundary | |
468 | * and always dump a multiple of 32 bytes | |
469 | */ | |
470 | p = (u32 *)(addr & ~(sizeof(u32) - 1)); | |
471 | nbytes += (addr & (sizeof(u32) - 1)); | |
472 | nlines = (nbytes + 31) / 32; | |
473 | ||
474 | ||
475 | for (i = 0; i < nlines; i++) { | |
476 | /* | |
477 | * just display low 16 bits of address to keep | |
478 | * each line of the dump < 80 characters | |
479 | */ | |
480 | printk("%04lx ", (unsigned long)p & 0xffff); | |
481 | for (j = 0; j < 8; j++) { | |
482 | u32 data; | |
483 | if (probe_kernel_address(p, data)) { | |
484 | printk(" ********"); | |
485 | } else { | |
486 | printk(" %08x", data); | |
487 | } | |
488 | ++p; | |
489 | } | |
490 | printk("\n"); | |
491 | } | |
492 | } | |
493 | ||
494 | static void show_extra_register_data(struct pt_regs *regs, int nbytes) | |
495 | { | |
496 | mm_segment_t fs; | |
497 | ||
498 | fs = get_fs(); | |
499 | set_fs(KERNEL_DS); | |
500 | show_data(regs->ARM_pc - nbytes, nbytes * 2, "PC"); | |
501 | show_data(regs->ARM_lr - nbytes, nbytes * 2, "LR"); | |
502 | show_data(regs->ARM_sp - nbytes, nbytes * 2, "SP"); | |
503 | show_data(regs->ARM_ip - nbytes, nbytes * 2, "IP"); | |
504 | show_data(regs->ARM_fp - nbytes, nbytes * 2, "FP"); | |
505 | show_data(regs->ARM_r0 - nbytes, nbytes * 2, "R0"); | |
506 | show_data(regs->ARM_r1 - nbytes, nbytes * 2, "R1"); | |
507 | show_data(regs->ARM_r2 - nbytes, nbytes * 2, "R2"); | |
508 | show_data(regs->ARM_r3 - nbytes, nbytes * 2, "R3"); | |
509 | show_data(regs->ARM_r4 - nbytes, nbytes * 2, "R4"); | |
510 | show_data(regs->ARM_r5 - nbytes, nbytes * 2, "R5"); | |
511 | show_data(regs->ARM_r6 - nbytes, nbytes * 2, "R6"); | |
512 | show_data(regs->ARM_r7 - nbytes, nbytes * 2, "R7"); | |
513 | show_data(regs->ARM_r8 - nbytes, nbytes * 2, "R8"); | |
514 | show_data(regs->ARM_r9 - nbytes, nbytes * 2, "R9"); | |
515 | show_data(regs->ARM_r10 - nbytes, nbytes * 2, "R10"); | |
516 | set_fs(fs); | |
517 | } | |
518 | ||
652a12ef | 519 | void __show_regs(struct pt_regs *regs) |
1da177e4 | 520 | { |
154c772e RK |
521 | unsigned long flags; |
522 | char buf[64]; | |
1da177e4 | 523 | |
a43cb95d TH |
524 | show_regs_print_info(KERN_DEFAULT); |
525 | ||
1da177e4 LT |
526 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
527 | print_symbol("LR is at %s\n", regs->ARM_lr); | |
154c772e | 528 | printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n" |
1da177e4 | 529 | "sp : %08lx ip : %08lx fp : %08lx\n", |
154c772e RK |
530 | regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr, |
531 | regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); | |
1da177e4 LT |
532 | printk("r10: %08lx r9 : %08lx r8 : %08lx\n", |
533 | regs->ARM_r10, regs->ARM_r9, | |
534 | regs->ARM_r8); | |
535 | printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", | |
536 | regs->ARM_r7, regs->ARM_r6, | |
537 | regs->ARM_r5, regs->ARM_r4); | |
538 | printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", | |
539 | regs->ARM_r3, regs->ARM_r2, | |
540 | regs->ARM_r1, regs->ARM_r0); | |
154c772e RK |
541 | |
542 | flags = regs->ARM_cpsr; | |
543 | buf[0] = flags & PSR_N_BIT ? 'N' : 'n'; | |
544 | buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z'; | |
545 | buf[2] = flags & PSR_C_BIT ? 'C' : 'c'; | |
546 | buf[3] = flags & PSR_V_BIT ? 'V' : 'v'; | |
547 | buf[4] = '\0'; | |
548 | ||
909d6c6c | 549 | printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n", |
154c772e | 550 | buf, interrupts_enabled(regs) ? "n" : "ff", |
1da177e4 LT |
551 | fast_interrupts_enabled(regs) ? "n" : "ff", |
552 | processor_modes[processor_mode(regs)], | |
909d6c6c | 553 | isa_modes[isa_mode(regs)], |
1da177e4 | 554 | get_fs() == get_ds() ? "kernel" : "user"); |
154c772e | 555 | #ifdef CONFIG_CPU_CP15 |
1da177e4 | 556 | { |
f12d0d7c | 557 | unsigned int ctrl; |
154c772e RK |
558 | |
559 | buf[0] = '\0'; | |
f12d0d7c | 560 | #ifdef CONFIG_CPU_CP15_MMU |
154c772e RK |
561 | { |
562 | unsigned int transbase, dac; | |
563 | asm("mrc p15, 0, %0, c2, c0\n\t" | |
564 | "mrc p15, 0, %1, c3, c0\n" | |
565 | : "=r" (transbase), "=r" (dac)); | |
566 | snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x", | |
567 | transbase, dac); | |
568 | } | |
f12d0d7c | 569 | #endif |
154c772e RK |
570 | asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl)); |
571 | ||
572 | printk("Control: %08x%s\n", ctrl, buf); | |
573 | } | |
f12d0d7c | 574 | #endif |
6fa3eb70 S |
575 | |
576 | show_extra_register_data(regs, 128); | |
1da177e4 LT |
577 | } |
578 | ||
652a12ef RK |
579 | void show_regs(struct pt_regs * regs) |
580 | { | |
581 | printk("\n"); | |
652a12ef | 582 | __show_regs(regs); |
b380ab4f | 583 | dump_stack(); |
652a12ef RK |
584 | } |
585 | ||
797245f5 RK |
586 | ATOMIC_NOTIFIER_HEAD(thread_notify_head); |
587 | ||
588 | EXPORT_SYMBOL_GPL(thread_notify_head); | |
589 | ||
1da177e4 LT |
590 | /* |
591 | * Free current thread data structures etc.. | |
592 | */ | |
593 | void exit_thread(void) | |
594 | { | |
797245f5 | 595 | thread_notify(THREAD_NOTIFY_EXIT, current_thread_info()); |
1da177e4 LT |
596 | } |
597 | ||
1da177e4 LT |
598 | void flush_thread(void) |
599 | { | |
600 | struct thread_info *thread = current_thread_info(); | |
601 | struct task_struct *tsk = current; | |
602 | ||
864232fa WD |
603 | flush_ptrace_hw_breakpoint(tsk); |
604 | ||
1da177e4 LT |
605 | memset(thread->used_cp, 0, sizeof(thread->used_cp)); |
606 | memset(&tsk->thread.debug, 0, sizeof(struct debug_info)); | |
d6551e88 RK |
607 | memset(&thread->fpstate, 0, sizeof(union fp_state)); |
608 | ||
609 | thread_notify(THREAD_NOTIFY_FLUSH, thread); | |
1da177e4 LT |
610 | } |
611 | ||
612 | void release_thread(struct task_struct *dead_task) | |
613 | { | |
1da177e4 LT |
614 | } |
615 | ||
616 | asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); | |
617 | ||
618 | int | |
6f2c55b8 | 619 | copy_thread(unsigned long clone_flags, unsigned long stack_start, |
afa86fc4 | 620 | unsigned long stk_sz, struct task_struct *p) |
1da177e4 | 621 | { |
815d5ec8 AV |
622 | struct thread_info *thread = task_thread_info(p); |
623 | struct pt_regs *childregs = task_pt_regs(p); | |
1da177e4 | 624 | |
1da177e4 | 625 | memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save)); |
9e14f828 | 626 | |
38a61b6b AV |
627 | if (likely(!(p->flags & PF_KTHREAD))) { |
628 | *childregs = *current_pt_regs(); | |
9e14f828 | 629 | childregs->ARM_r0 = 0; |
38a61b6b AV |
630 | if (stack_start) |
631 | childregs->ARM_sp = stack_start; | |
9e14f828 | 632 | } else { |
9fff2fa0 | 633 | memset(childregs, 0, sizeof(struct pt_regs)); |
9e14f828 AV |
634 | thread->cpu_context.r4 = stk_sz; |
635 | thread->cpu_context.r5 = stack_start; | |
9e14f828 AV |
636 | childregs->ARM_cpsr = SVC_MODE; |
637 | } | |
9fff2fa0 | 638 | thread->cpu_context.pc = (unsigned long)ret_from_fork; |
1da177e4 | 639 | thread->cpu_context.sp = (unsigned long)childregs; |
1da177e4 | 640 | |
864232fa WD |
641 | clear_ptrace_hw_breakpoint(p); |
642 | ||
1da177e4 | 643 | if (clone_flags & CLONE_SETTLS) |
4b9e9796 S |
644 | thread->tp_value[0] = childregs->ARM_r3; |
645 | thread->tp_value[1] = get_tpuser(); | |
1da177e4 | 646 | |
2e82669a CM |
647 | thread_notify(THREAD_NOTIFY_COPY, thread); |
648 | ||
1da177e4 LT |
649 | return 0; |
650 | } | |
651 | ||
cde3f860 AB |
652 | /* |
653 | * Fill in the task's elfregs structure for a core dump. | |
654 | */ | |
655 | int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs) | |
656 | { | |
657 | elf_core_copy_regs(elfregs, task_pt_regs(t)); | |
658 | return 1; | |
659 | } | |
660 | ||
1da177e4 LT |
661 | /* |
662 | * fill in the fpe structure for a core dump... | |
663 | */ | |
664 | int dump_fpu (struct pt_regs *regs, struct user_fp *fp) | |
665 | { | |
666 | struct thread_info *thread = current_thread_info(); | |
667 | int used_math = thread->used_cp[1] | thread->used_cp[2]; | |
668 | ||
669 | if (used_math) | |
670 | memcpy(fp, &thread->fpstate.soft, sizeof (*fp)); | |
671 | ||
672 | return used_math != 0; | |
673 | } | |
674 | EXPORT_SYMBOL(dump_fpu); | |
675 | ||
1da177e4 LT |
676 | unsigned long get_wchan(struct task_struct *p) |
677 | { | |
2d7c11bf | 678 | struct stackframe frame; |
7768a84a | 679 | unsigned long stack_page; |
1da177e4 LT |
680 | int count = 0; |
681 | if (!p || p == current || p->state == TASK_RUNNING) | |
682 | return 0; | |
683 | ||
2d7c11bf CM |
684 | frame.fp = thread_saved_fp(p); |
685 | frame.sp = thread_saved_sp(p); | |
686 | frame.lr = 0; /* recovered from the stack */ | |
687 | frame.pc = thread_saved_pc(p); | |
7768a84a | 688 | stack_page = (unsigned long)task_stack_page(p); |
1da177e4 | 689 | do { |
7768a84a KK |
690 | if (frame.sp < stack_page || |
691 | frame.sp >= stack_page + THREAD_SIZE || | |
692 | unwind_frame(&frame) < 0) | |
1da177e4 | 693 | return 0; |
2d7c11bf CM |
694 | if (!in_sched_functions(frame.pc)) |
695 | return frame.pc; | |
1da177e4 LT |
696 | } while (count ++ < 16); |
697 | return 0; | |
698 | } | |
990cb8ac NP |
699 | |
700 | unsigned long arch_randomize_brk(struct mm_struct *mm) | |
701 | { | |
702 | unsigned long range_end = mm->brk + 0x02000000; | |
703 | return randomize_range(mm->brk, range_end, 0) ? : mm->brk; | |
704 | } | |
ec706dab | 705 | |
6cde6d42 | 706 | #ifdef CONFIG_MMU |
75bc4446 | 707 | #ifdef CONFIG_KUSER_HELPERS |
ec706dab NP |
708 | /* |
709 | * The vectors page is always readable from user space for the | |
a5510daa RK |
710 | * atomic helpers. Insert it into the gate_vma so that it is visible |
711 | * through ptrace and /proc/<pid>/mem. | |
ec706dab | 712 | */ |
f6604efe RK |
713 | static struct vm_area_struct gate_vma = { |
714 | .vm_start = 0xffff0000, | |
715 | .vm_end = 0xffff0000 + PAGE_SIZE, | |
716 | .vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYEXEC, | |
f6604efe | 717 | }; |
ec706dab | 718 | |
f9d4861f | 719 | static int __init gate_vma_init(void) |
ec706dab | 720 | { |
f6604efe | 721 | gate_vma.vm_page_prot = PAGE_READONLY_EXEC; |
f9d4861f WD |
722 | return 0; |
723 | } | |
724 | arch_initcall(gate_vma_init); | |
725 | ||
726 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) | |
727 | { | |
728 | return &gate_vma; | |
729 | } | |
730 | ||
731 | int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
732 | { | |
733 | return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end); | |
734 | } | |
735 | ||
736 | int in_gate_area_no_mm(unsigned long addr) | |
737 | { | |
738 | return in_gate_area(NULL, addr); | |
ec706dab | 739 | } |
1176dcde | 740 | #define is_gate_vma(vma) ((vma) == &gate_vma) |
75bc4446 RK |
741 | #else |
742 | #define is_gate_vma(vma) 0 | |
743 | #endif | |
ec706dab NP |
744 | |
745 | const char *arch_vma_name(struct vm_area_struct *vma) | |
746 | { | |
75bc4446 | 747 | return is_gate_vma(vma) ? "[vectors]" : |
a5510daa RK |
748 | (vma->vm_mm && vma->vm_start == vma->vm_mm->context.sigpage) ? |
749 | "[sigpage]" : NULL; | |
750 | } | |
751 | ||
17ef3295 | 752 | static struct page *signal_page; |
a5510daa RK |
753 | extern struct page *get_signal_page(void); |
754 | ||
755 | int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) | |
756 | { | |
757 | struct mm_struct *mm = current->mm; | |
a5510daa RK |
758 | unsigned long addr; |
759 | int ret; | |
760 | ||
17ef3295 RK |
761 | if (!signal_page) |
762 | signal_page = get_signal_page(); | |
763 | if (!signal_page) | |
a5510daa RK |
764 | return -ENOMEM; |
765 | ||
766 | down_write(&mm->mmap_sem); | |
767 | addr = get_unmapped_area(NULL, 0, PAGE_SIZE, 0, 0); | |
768 | if (IS_ERR_VALUE(addr)) { | |
769 | ret = addr; | |
770 | goto up_fail; | |
771 | } | |
772 | ||
773 | ret = install_special_mapping(mm, addr, PAGE_SIZE, | |
774 | VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC, | |
17ef3295 | 775 | &signal_page); |
a5510daa RK |
776 | |
777 | if (ret == 0) | |
778 | mm->context.sigpage = addr; | |
779 | ||
780 | up_fail: | |
781 | up_write(&mm->mmap_sem); | |
782 | return ret; | |
ec706dab | 783 | } |
6cde6d42 | 784 | #endif |