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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
13#include <linux/module.h>
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>
19#include <linux/user.h>
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>
25#include <linux/cpu.h>
26#include <linux/elfcore.h>
27#include <linux/pm.h>
28#include <linux/tick.h>
29#include <linux/utsname.h>
30#include <linux/uaccess.h>
31#include <linux/random.h>
32#include <linux/hw_breakpoint.h>
33#include <linux/cpuidle.h>
34
35#include <asm/cacheflush.h>
36#include <asm/leds.h>
37#include <asm/processor.h>
38#include <asm/system.h>
39#include <asm/thread_notify.h>
40#include <asm/stacktrace.h>
41#include <asm/mach/time.h>
42
43#ifdef CONFIG_CC_STACKPROTECTOR
44#include <linux/stackprotector.h>
45unsigned long __stack_chk_guard __read_mostly;
46EXPORT_SYMBOL(__stack_chk_guard);
47#endif
48
49static const char *processor_modes[] = {
50 "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
51 "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
52 "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" ,
53 "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
54};
55
56static const char *isa_modes[] = {
57 "ARM" , "Thumb" , "Jazelle", "ThumbEE"
58};
59
60extern void setup_mm_for_reboot(char mode);
61
62static volatile int hlt_counter;
63
64#include <mach/system.h>
65
66void disable_hlt(void)
67{
68 hlt_counter++;
69}
70
71EXPORT_SYMBOL(disable_hlt);
72
73void enable_hlt(void)
74{
75 hlt_counter--;
76}
77
78EXPORT_SYMBOL(enable_hlt);
79
80static int __init nohlt_setup(char *__unused)
81{
82 hlt_counter = 1;
83 return 1;
84}
85
86static int __init hlt_setup(char *__unused)
87{
88 hlt_counter = 0;
89 return 1;
90}
91
92__setup("nohlt", nohlt_setup);
93__setup("hlt", hlt_setup);
94
95void arm_machine_restart(char mode, const char *cmd)
96{
97 /* Disable interrupts first */
98 local_irq_disable();
99 local_fiq_disable();
100
101 /*
102 * Tell the mm system that we are going to reboot -
103 * we may need it to insert some 1:1 mappings so that
104 * soft boot works.
105 */
106 setup_mm_for_reboot(mode);
107
108 /* Clean and invalidate caches */
109 flush_cache_all();
110
111 /* Turn off caching */
112 cpu_proc_fin();
113
114 /* Push out any further dirty data, and ensure cache is empty */
115 flush_cache_all();
116
117 /*
118 * Now call the architecture specific reboot code.
119 */
120 arch_reset(mode, cmd);
121
122 /*
123 * Whoops - the architecture was unable to reboot.
124 * Tell the user!
125 */
126 mdelay(1000);
127 printk("Reboot failed -- System halted\n");
128 while (1);
129}
130
131/*
132 * Function pointers to optional machine specific functions
133 */
134void (*pm_power_off)(void);
135EXPORT_SYMBOL(pm_power_off);
136
137void (*arm_pm_restart)(char str, const char *cmd) = arm_machine_restart;
138EXPORT_SYMBOL_GPL(arm_pm_restart);
139
140static void do_nothing(void *unused)
141{
142}
143
144/*
145 * cpu_idle_wait - Used to ensure that all the CPUs discard old value of
146 * pm_idle and update to new pm_idle value. Required while changing pm_idle
147 * handler on SMP systems.
148 *
149 * Caller must have changed pm_idle to the new value before the call. Old
150 * pm_idle value will not be used by any CPU after the return of this function.
151 */
152void cpu_idle_wait(void)
153{
154 smp_mb();
155 /* kick all the CPUs so that they exit out of pm_idle */
156 smp_call_function(do_nothing, NULL, 1);
157}
158EXPORT_SYMBOL_GPL(cpu_idle_wait);
159
160/*
161 * This is our default idle handler. We need to disable
162 * interrupts here to ensure we don't miss a wakeup call.
163 */
164static void default_idle(void)
165{
166 if (!need_resched())
167 arch_idle();
168 local_irq_enable();
169}
170
171void (*pm_idle)(void) = default_idle;
172EXPORT_SYMBOL(pm_idle);
173
174/*
175 * The idle thread, has rather strange semantics for calling pm_idle,
176 * but this is what x86 does and we need to do the same, so that
177 * things like cpuidle get called in the same way. The only difference
178 * is that we always respect 'hlt_counter' to prevent low power idle.
179 */
180void cpu_idle(void)
181{
182 local_fiq_enable();
183
184 /* endless idle loop with no priority at all */
185 while (1) {
186 tick_nohz_stop_sched_tick(1);
187 leds_event(led_idle_start);
188 while (!need_resched()) {
189#ifdef CONFIG_HOTPLUG_CPU
190 if (cpu_is_offline(smp_processor_id()))
191 cpu_die();
192#endif
193
194 local_irq_disable();
195 if (hlt_counter) {
196 local_irq_enable();
197 cpu_relax();
198 } else {
199 stop_critical_timings();
200 if (cpuidle_idle_call())
201 pm_idle();
202 start_critical_timings();
203 /*
204 * This will eventually be removed - pm_idle
205 * functions should always return with IRQs
206 * enabled.
207 */
208 WARN_ON(irqs_disabled());
209 local_irq_enable();
210 }
211 }
212 leds_event(led_idle_end);
213 tick_nohz_restart_sched_tick();
214 preempt_enable_no_resched();
215 schedule();
216 preempt_disable();
217 }
218}
219
220static char reboot_mode = 'h';
221
222int __init reboot_setup(char *str)
223{
224 reboot_mode = str[0];
225 return 1;
226}
227
228__setup("reboot=", reboot_setup);
229
230void machine_shutdown(void)
231{
232#ifdef CONFIG_SMP
233 smp_send_stop();
234#endif
235}
236
237void machine_halt(void)
238{
239 machine_shutdown();
240 while (1);
241}
242
243void machine_power_off(void)
244{
245 machine_shutdown();
246 if (pm_power_off)
247 pm_power_off();
248}
249
250void machine_restart(char *cmd)
251{
252 machine_shutdown();
253 arm_pm_restart(reboot_mode, cmd);
254}
255
256void __show_regs(struct pt_regs *regs)
257{
258 unsigned long flags;
259 char buf[64];
260
261 printk("CPU: %d %s (%s %.*s)\n",
262 raw_smp_processor_id(), print_tainted(),
263 init_utsname()->release,
264 (int)strcspn(init_utsname()->version, " "),
265 init_utsname()->version);
266 print_symbol("PC is at %s\n", instruction_pointer(regs));
267 print_symbol("LR is at %s\n", regs->ARM_lr);
268 printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n"
269 "sp : %08lx ip : %08lx fp : %08lx\n",
270 regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr,
271 regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
272 printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
273 regs->ARM_r10, regs->ARM_r9,
274 regs->ARM_r8);
275 printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
276 regs->ARM_r7, regs->ARM_r6,
277 regs->ARM_r5, regs->ARM_r4);
278 printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
279 regs->ARM_r3, regs->ARM_r2,
280 regs->ARM_r1, regs->ARM_r0);
281
282 flags = regs->ARM_cpsr;
283 buf[0] = flags & PSR_N_BIT ? 'N' : 'n';
284 buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z';
285 buf[2] = flags & PSR_C_BIT ? 'C' : 'c';
286 buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
287 buf[4] = '\0';
288
289 printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n",
290 buf, interrupts_enabled(regs) ? "n" : "ff",
291 fast_interrupts_enabled(regs) ? "n" : "ff",
292 processor_modes[processor_mode(regs)],
293 isa_modes[isa_mode(regs)],
294 get_fs() == get_ds() ? "kernel" : "user");
295#ifdef CONFIG_CPU_CP15
296 {
297 unsigned int ctrl;
298
299 buf[0] = '\0';
300#ifdef CONFIG_CPU_CP15_MMU
301 {
302 unsigned int transbase, dac;
303 asm("mrc p15, 0, %0, c2, c0\n\t"
304 "mrc p15, 0, %1, c3, c0\n"
305 : "=r" (transbase), "=r" (dac));
306 snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x",
307 transbase, dac);
308 }
309#endif
310 asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));
311
312 printk("Control: %08x%s\n", ctrl, buf);
313 }
314#endif
315}
316
317void show_regs(struct pt_regs * regs)
318{
319 printk("\n");
320 printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm);
321 __show_regs(regs);
322 __backtrace();
323}
324
325ATOMIC_NOTIFIER_HEAD(thread_notify_head);
326
327EXPORT_SYMBOL_GPL(thread_notify_head);
328
329/*
330 * Free current thread data structures etc..
331 */
332void exit_thread(void)
333{
334 thread_notify(THREAD_NOTIFY_EXIT, current_thread_info());
335}
336
337void flush_thread(void)
338{
339 struct thread_info *thread = current_thread_info();
340 struct task_struct *tsk = current;
341
342 flush_ptrace_hw_breakpoint(tsk);
343
344 memset(thread->used_cp, 0, sizeof(thread->used_cp));
345 memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
346 memset(&thread->fpstate, 0, sizeof(union fp_state));
347
348 thread_notify(THREAD_NOTIFY_FLUSH, thread);
349}
350
351void release_thread(struct task_struct *dead_task)
352{
353}
354
355asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
356
357int
358copy_thread(unsigned long clone_flags, unsigned long stack_start,
359 unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs)
360{
361 struct thread_info *thread = task_thread_info(p);
362 struct pt_regs *childregs = task_pt_regs(p);
363
364 *childregs = *regs;
365 childregs->ARM_r0 = 0;
366 childregs->ARM_sp = stack_start;
367
368 memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
369 thread->cpu_context.sp = (unsigned long)childregs;
370 thread->cpu_context.pc = (unsigned long)ret_from_fork;
371
372 clear_ptrace_hw_breakpoint(p);
373
374 if (clone_flags & CLONE_SETTLS)
375 thread->tp_value = regs->ARM_r3;
376
377 thread_notify(THREAD_NOTIFY_COPY, thread);
378
379 return 0;
380}
381
382/*
383 * Fill in the task's elfregs structure for a core dump.
384 */
385int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs)
386{
387 elf_core_copy_regs(elfregs, task_pt_regs(t));
388 return 1;
389}
390
391/*
392 * fill in the fpe structure for a core dump...
393 */
394int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
395{
396 struct thread_info *thread = current_thread_info();
397 int used_math = thread->used_cp[1] | thread->used_cp[2];
398
399 if (used_math)
400 memcpy(fp, &thread->fpstate.soft, sizeof (*fp));
401
402 return used_math != 0;
403}
404EXPORT_SYMBOL(dump_fpu);
405
406/*
407 * Shuffle the argument into the correct register before calling the
408 * thread function. r4 is the thread argument, r5 is the pointer to
409 * the thread function, and r6 points to the exit function.
410 */
411extern void kernel_thread_helper(void);
412asm( ".pushsection .text\n"
413" .align\n"
414" .type kernel_thread_helper, #function\n"
415"kernel_thread_helper:\n"
416#ifdef CONFIG_TRACE_IRQFLAGS
417" bl trace_hardirqs_on\n"
418#endif
419" msr cpsr_c, r7\n"
420" mov r0, r4\n"
421" mov lr, r6\n"
422" mov pc, r5\n"
423" .size kernel_thread_helper, . - kernel_thread_helper\n"
424" .popsection");
425
426#ifdef CONFIG_ARM_UNWIND
427extern void kernel_thread_exit(long code);
428asm( ".pushsection .text\n"
429" .align\n"
430" .type kernel_thread_exit, #function\n"
431"kernel_thread_exit:\n"
432" .fnstart\n"
433" .cantunwind\n"
434" bl do_exit\n"
435" nop\n"
436" .fnend\n"
437" .size kernel_thread_exit, . - kernel_thread_exit\n"
438" .popsection");
439#else
440#define kernel_thread_exit do_exit
441#endif
442
443/*
444 * Create a kernel thread.
445 */
446pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
447{
448 struct pt_regs regs;
449
450 memset(®s, 0, sizeof(regs));
451
452 regs.ARM_r4 = (unsigned long)arg;
453 regs.ARM_r5 = (unsigned long)fn;
454 regs.ARM_r6 = (unsigned long)kernel_thread_exit;
455 regs.ARM_r7 = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE;
456 regs.ARM_pc = (unsigned long)kernel_thread_helper;
457 regs.ARM_cpsr = regs.ARM_r7 | PSR_I_BIT;
458
459 return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
460}
461EXPORT_SYMBOL(kernel_thread);
462
463unsigned long get_wchan(struct task_struct *p)
464{
465 struct stackframe frame;
466 int count = 0;
467 if (!p || p == current || p->state == TASK_RUNNING)
468 return 0;
469
470 frame.fp = thread_saved_fp(p);
471 frame.sp = thread_saved_sp(p);
472 frame.lr = 0; /* recovered from the stack */
473 frame.pc = thread_saved_pc(p);
474 do {
475 int ret = unwind_frame(&frame);
476 if (ret < 0)
477 return 0;
478 if (!in_sched_functions(frame.pc))
479 return frame.pc;
480 } while (count ++ < 16);
481 return 0;
482}
483
484unsigned long arch_randomize_brk(struct mm_struct *mm)
485{
486 unsigned long range_end = mm->brk + 0x02000000;
487 return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
488}
489
490#ifdef CONFIG_MMU
491/*
492 * The vectors page is always readable from user space for the
493 * atomic helpers and the signal restart code. Let's declare a mapping
494 * for it so it is visible through ptrace and /proc/<pid>/mem.
495 */
496
497int vectors_user_mapping(void)
498{
499 struct mm_struct *mm = current->mm;
500 return install_special_mapping(mm, 0xffff0000, PAGE_SIZE,
501 VM_READ | VM_EXEC |
502 VM_MAYREAD | VM_MAYEXEC |
503 VM_ALWAYSDUMP | VM_RESERVED,
504 NULL);
505}
506
507const char *arch_vma_name(struct vm_area_struct *vma)
508{
509 return (vma->vm_start == 0xffff0000) ? "[vectors]" : NULL;
510}
511#endif
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
13#include <linux/export.h>
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>
19#include <linux/user.h>
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>
25#include <linux/cpu.h>
26#include <linux/elfcore.h>
27#include <linux/pm.h>
28#include <linux/tick.h>
29#include <linux/utsname.h>
30#include <linux/uaccess.h>
31#include <linux/random.h>
32#include <linux/hw_breakpoint.h>
33#include <linux/cpuidle.h>
34
35#include <asm/cacheflush.h>
36#include <asm/leds.h>
37#include <asm/processor.h>
38#include <asm/thread_notify.h>
39#include <asm/stacktrace.h>
40#include <asm/mach/time.h>
41
42#ifdef CONFIG_CC_STACKPROTECTOR
43#include <linux/stackprotector.h>
44unsigned long __stack_chk_guard __read_mostly;
45EXPORT_SYMBOL(__stack_chk_guard);
46#endif
47
48static const char *processor_modes[] = {
49 "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
50 "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
51 "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" ,
52 "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
53};
54
55static const char *isa_modes[] = {
56 "ARM" , "Thumb" , "Jazelle", "ThumbEE"
57};
58
59extern void setup_mm_for_reboot(void);
60
61static volatile int hlt_counter;
62
63void disable_hlt(void)
64{
65 hlt_counter++;
66}
67
68EXPORT_SYMBOL(disable_hlt);
69
70void enable_hlt(void)
71{
72 hlt_counter--;
73}
74
75EXPORT_SYMBOL(enable_hlt);
76
77static int __init nohlt_setup(char *__unused)
78{
79 hlt_counter = 1;
80 return 1;
81}
82
83static int __init hlt_setup(char *__unused)
84{
85 hlt_counter = 0;
86 return 1;
87}
88
89__setup("nohlt", nohlt_setup);
90__setup("hlt", hlt_setup);
91
92extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
93typedef void (*phys_reset_t)(unsigned long);
94
95/*
96 * A temporary stack to use for CPU reset. This is static so that we
97 * don't clobber it with the identity mapping. When running with this
98 * stack, any references to the current task *will not work* so you
99 * should really do as little as possible before jumping to your reset
100 * code.
101 */
102static u64 soft_restart_stack[16];
103
104static void __soft_restart(void *addr)
105{
106 phys_reset_t phys_reset;
107
108 /* Take out a flat memory mapping. */
109 setup_mm_for_reboot();
110
111 /* Clean and invalidate caches */
112 flush_cache_all();
113
114 /* Turn off caching */
115 cpu_proc_fin();
116
117 /* Push out any further dirty data, and ensure cache is empty */
118 flush_cache_all();
119
120 /* Switch to the identity mapping. */
121 phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
122 phys_reset((unsigned long)addr);
123
124 /* Should never get here. */
125 BUG();
126}
127
128void soft_restart(unsigned long addr)
129{
130 u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack);
131
132 /* Disable interrupts first */
133 local_irq_disable();
134 local_fiq_disable();
135
136 /* Disable the L2 if we're the last man standing. */
137 if (num_online_cpus() == 1)
138 outer_disable();
139
140 /* Change to the new stack and continue with the reset. */
141 call_with_stack(__soft_restart, (void *)addr, (void *)stack);
142
143 /* Should never get here. */
144 BUG();
145}
146
147static void null_restart(char mode, const char *cmd)
148{
149}
150
151/*
152 * Function pointers to optional machine specific functions
153 */
154void (*pm_power_off)(void);
155EXPORT_SYMBOL(pm_power_off);
156
157void (*arm_pm_restart)(char str, const char *cmd) = null_restart;
158EXPORT_SYMBOL_GPL(arm_pm_restart);
159
160/*
161 * This is our default idle handler.
162 */
163
164void (*arm_pm_idle)(void);
165
166static void default_idle(void)
167{
168 if (arm_pm_idle)
169 arm_pm_idle();
170 else
171 cpu_do_idle();
172 local_irq_enable();
173}
174
175void (*pm_idle)(void) = default_idle;
176EXPORT_SYMBOL(pm_idle);
177
178/*
179 * The idle thread, has rather strange semantics for calling pm_idle,
180 * but this is what x86 does and we need to do the same, so that
181 * things like cpuidle get called in the same way. The only difference
182 * is that we always respect 'hlt_counter' to prevent low power idle.
183 */
184void cpu_idle(void)
185{
186 local_fiq_enable();
187
188 /* endless idle loop with no priority at all */
189 while (1) {
190 tick_nohz_idle_enter();
191 rcu_idle_enter();
192 leds_event(led_idle_start);
193 while (!need_resched()) {
194#ifdef CONFIG_HOTPLUG_CPU
195 if (cpu_is_offline(smp_processor_id()))
196 cpu_die();
197#endif
198
199 /*
200 * We need to disable interrupts here
201 * to ensure we don't miss a wakeup call.
202 */
203 local_irq_disable();
204#ifdef CONFIG_PL310_ERRATA_769419
205 wmb();
206#endif
207 if (hlt_counter) {
208 local_irq_enable();
209 cpu_relax();
210 } else if (!need_resched()) {
211 stop_critical_timings();
212 if (cpuidle_idle_call())
213 pm_idle();
214 start_critical_timings();
215 /*
216 * pm_idle functions must always
217 * return with IRQs enabled.
218 */
219 WARN_ON(irqs_disabled());
220 } else
221 local_irq_enable();
222 }
223 leds_event(led_idle_end);
224 rcu_idle_exit();
225 tick_nohz_idle_exit();
226 schedule_preempt_disabled();
227 }
228}
229
230static char reboot_mode = 'h';
231
232int __init reboot_setup(char *str)
233{
234 reboot_mode = str[0];
235 return 1;
236}
237
238__setup("reboot=", reboot_setup);
239
240void machine_shutdown(void)
241{
242#ifdef CONFIG_SMP
243 smp_send_stop();
244#endif
245}
246
247void machine_halt(void)
248{
249 machine_shutdown();
250 local_irq_disable();
251 while (1);
252}
253
254void machine_power_off(void)
255{
256 machine_shutdown();
257 if (pm_power_off)
258 pm_power_off();
259}
260
261void machine_restart(char *cmd)
262{
263 machine_shutdown();
264
265 arm_pm_restart(reboot_mode, cmd);
266
267 /* Give a grace period for failure to restart of 1s */
268 mdelay(1000);
269
270 /* Whoops - the platform was unable to reboot. Tell the user! */
271 printk("Reboot failed -- System halted\n");
272 local_irq_disable();
273 while (1);
274}
275
276void __show_regs(struct pt_regs *regs)
277{
278 unsigned long flags;
279 char buf[64];
280
281 printk("CPU: %d %s (%s %.*s)\n",
282 raw_smp_processor_id(), print_tainted(),
283 init_utsname()->release,
284 (int)strcspn(init_utsname()->version, " "),
285 init_utsname()->version);
286 print_symbol("PC is at %s\n", instruction_pointer(regs));
287 print_symbol("LR is at %s\n", regs->ARM_lr);
288 printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n"
289 "sp : %08lx ip : %08lx fp : %08lx\n",
290 regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr,
291 regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
292 printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
293 regs->ARM_r10, regs->ARM_r9,
294 regs->ARM_r8);
295 printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
296 regs->ARM_r7, regs->ARM_r6,
297 regs->ARM_r5, regs->ARM_r4);
298 printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
299 regs->ARM_r3, regs->ARM_r2,
300 regs->ARM_r1, regs->ARM_r0);
301
302 flags = regs->ARM_cpsr;
303 buf[0] = flags & PSR_N_BIT ? 'N' : 'n';
304 buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z';
305 buf[2] = flags & PSR_C_BIT ? 'C' : 'c';
306 buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
307 buf[4] = '\0';
308
309 printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n",
310 buf, interrupts_enabled(regs) ? "n" : "ff",
311 fast_interrupts_enabled(regs) ? "n" : "ff",
312 processor_modes[processor_mode(regs)],
313 isa_modes[isa_mode(regs)],
314 get_fs() == get_ds() ? "kernel" : "user");
315#ifdef CONFIG_CPU_CP15
316 {
317 unsigned int ctrl;
318
319 buf[0] = '\0';
320#ifdef CONFIG_CPU_CP15_MMU
321 {
322 unsigned int transbase, dac;
323 asm("mrc p15, 0, %0, c2, c0\n\t"
324 "mrc p15, 0, %1, c3, c0\n"
325 : "=r" (transbase), "=r" (dac));
326 snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x",
327 transbase, dac);
328 }
329#endif
330 asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));
331
332 printk("Control: %08x%s\n", ctrl, buf);
333 }
334#endif
335}
336
337void show_regs(struct pt_regs * regs)
338{
339 printk("\n");
340 printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm);
341 __show_regs(regs);
342 dump_stack();
343}
344
345ATOMIC_NOTIFIER_HEAD(thread_notify_head);
346
347EXPORT_SYMBOL_GPL(thread_notify_head);
348
349/*
350 * Free current thread data structures etc..
351 */
352void exit_thread(void)
353{
354 thread_notify(THREAD_NOTIFY_EXIT, current_thread_info());
355}
356
357void flush_thread(void)
358{
359 struct thread_info *thread = current_thread_info();
360 struct task_struct *tsk = current;
361
362 flush_ptrace_hw_breakpoint(tsk);
363
364 memset(thread->used_cp, 0, sizeof(thread->used_cp));
365 memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
366 memset(&thread->fpstate, 0, sizeof(union fp_state));
367
368 thread_notify(THREAD_NOTIFY_FLUSH, thread);
369}
370
371void release_thread(struct task_struct *dead_task)
372{
373}
374
375asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
376
377int
378copy_thread(unsigned long clone_flags, unsigned long stack_start,
379 unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs)
380{
381 struct thread_info *thread = task_thread_info(p);
382 struct pt_regs *childregs = task_pt_regs(p);
383
384 *childregs = *regs;
385 childregs->ARM_r0 = 0;
386 childregs->ARM_sp = stack_start;
387
388 memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
389 thread->cpu_context.sp = (unsigned long)childregs;
390 thread->cpu_context.pc = (unsigned long)ret_from_fork;
391
392 clear_ptrace_hw_breakpoint(p);
393
394 if (clone_flags & CLONE_SETTLS)
395 thread->tp_value = regs->ARM_r3;
396
397 thread_notify(THREAD_NOTIFY_COPY, thread);
398
399 return 0;
400}
401
402/*
403 * Fill in the task's elfregs structure for a core dump.
404 */
405int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs)
406{
407 elf_core_copy_regs(elfregs, task_pt_regs(t));
408 return 1;
409}
410
411/*
412 * fill in the fpe structure for a core dump...
413 */
414int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
415{
416 struct thread_info *thread = current_thread_info();
417 int used_math = thread->used_cp[1] | thread->used_cp[2];
418
419 if (used_math)
420 memcpy(fp, &thread->fpstate.soft, sizeof (*fp));
421
422 return used_math != 0;
423}
424EXPORT_SYMBOL(dump_fpu);
425
426/*
427 * Shuffle the argument into the correct register before calling the
428 * thread function. r4 is the thread argument, r5 is the pointer to
429 * the thread function, and r6 points to the exit function.
430 */
431extern void kernel_thread_helper(void);
432asm( ".pushsection .text\n"
433" .align\n"
434" .type kernel_thread_helper, #function\n"
435"kernel_thread_helper:\n"
436#ifdef CONFIG_TRACE_IRQFLAGS
437" bl trace_hardirqs_on\n"
438#endif
439" msr cpsr_c, r7\n"
440" mov r0, r4\n"
441" mov lr, r6\n"
442" mov pc, r5\n"
443" .size kernel_thread_helper, . - kernel_thread_helper\n"
444" .popsection");
445
446#ifdef CONFIG_ARM_UNWIND
447extern void kernel_thread_exit(long code);
448asm( ".pushsection .text\n"
449" .align\n"
450" .type kernel_thread_exit, #function\n"
451"kernel_thread_exit:\n"
452" .fnstart\n"
453" .cantunwind\n"
454" bl do_exit\n"
455" nop\n"
456" .fnend\n"
457" .size kernel_thread_exit, . - kernel_thread_exit\n"
458" .popsection");
459#else
460#define kernel_thread_exit do_exit
461#endif
462
463/*
464 * Create a kernel thread.
465 */
466pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
467{
468 struct pt_regs regs;
469
470 memset(®s, 0, sizeof(regs));
471
472 regs.ARM_r4 = (unsigned long)arg;
473 regs.ARM_r5 = (unsigned long)fn;
474 regs.ARM_r6 = (unsigned long)kernel_thread_exit;
475 regs.ARM_r7 = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE;
476 regs.ARM_pc = (unsigned long)kernel_thread_helper;
477 regs.ARM_cpsr = regs.ARM_r7 | PSR_I_BIT;
478
479 return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
480}
481EXPORT_SYMBOL(kernel_thread);
482
483unsigned long get_wchan(struct task_struct *p)
484{
485 struct stackframe frame;
486 int count = 0;
487 if (!p || p == current || p->state == TASK_RUNNING)
488 return 0;
489
490 frame.fp = thread_saved_fp(p);
491 frame.sp = thread_saved_sp(p);
492 frame.lr = 0; /* recovered from the stack */
493 frame.pc = thread_saved_pc(p);
494 do {
495 int ret = unwind_frame(&frame);
496 if (ret < 0)
497 return 0;
498 if (!in_sched_functions(frame.pc))
499 return frame.pc;
500 } while (count ++ < 16);
501 return 0;
502}
503
504unsigned long arch_randomize_brk(struct mm_struct *mm)
505{
506 unsigned long range_end = mm->brk + 0x02000000;
507 return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
508}
509
510#ifdef CONFIG_MMU
511/*
512 * The vectors page is always readable from user space for the
513 * atomic helpers and the signal restart code. Insert it into the
514 * gate_vma so that it is visible through ptrace and /proc/<pid>/mem.
515 */
516static struct vm_area_struct gate_vma;
517
518static int __init gate_vma_init(void)
519{
520 gate_vma.vm_start = 0xffff0000;
521 gate_vma.vm_end = 0xffff0000 + PAGE_SIZE;
522 gate_vma.vm_page_prot = PAGE_READONLY_EXEC;
523 gate_vma.vm_flags = VM_READ | VM_EXEC |
524 VM_MAYREAD | VM_MAYEXEC;
525 return 0;
526}
527arch_initcall(gate_vma_init);
528
529struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
530{
531 return &gate_vma;
532}
533
534int in_gate_area(struct mm_struct *mm, unsigned long addr)
535{
536 return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end);
537}
538
539int in_gate_area_no_mm(unsigned long addr)
540{
541 return in_gate_area(NULL, addr);
542}
543
544const char *arch_vma_name(struct vm_area_struct *vma)
545{
546 return (vma == &gate_vma) ? "[vectors]" : NULL;
547}
548#endif