Commit | Line | Data |
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5f97f7f9 HS |
1 | /* |
2 | * Copyright (C) 2004-2006 Atmel Corporation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | #include <linux/sched.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/kallsyms.h> | |
11 | #include <linux/fs.h> | |
b3bc2c55 | 12 | #include <linux/pm.h> |
5f97f7f9 | 13 | #include <linux/ptrace.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
5f97f7f9 | 15 | #include <linux/reboot.h> |
d45ad062 | 16 | #include <linux/tick.h> |
623b0355 | 17 | #include <linux/uaccess.h> |
5f97f7f9 HS |
18 | #include <linux/unistd.h> |
19 | ||
20 | #include <asm/sysreg.h> | |
21 | #include <asm/ocd.h> | |
c80ce2d5 | 22 | #include <asm/syscalls.h> |
5f97f7f9 | 23 | |
3663b736 | 24 | #include <mach/pm.h> |
7e59128f | 25 | |
b3bc2c55 | 26 | void (*pm_power_off)(void); |
5f97f7f9 HS |
27 | EXPORT_SYMBOL(pm_power_off); |
28 | ||
29 | /* | |
30 | * This file handles the architecture-dependent parts of process handling.. | |
31 | */ | |
32 | ||
33 | void cpu_idle(void) | |
34 | { | |
35 | /* endless idle loop with no priority at all */ | |
36 | while (1) { | |
b8f8c3cf | 37 | tick_nohz_stop_sched_tick(1); |
5f97f7f9 | 38 | while (!need_resched()) |
19b7ce8b | 39 | cpu_idle_sleep(); |
d45ad062 | 40 | tick_nohz_restart_sched_tick(); |
5f97f7f9 HS |
41 | preempt_enable_no_resched(); |
42 | schedule(); | |
43 | preempt_disable(); | |
44 | } | |
45 | } | |
46 | ||
47 | void machine_halt(void) | |
48 | { | |
c2eb5090 HS |
49 | /* |
50 | * Enter Stop mode. The 32 kHz oscillator will keep running so | |
51 | * the RTC will keep the time properly and the system will | |
52 | * boot quickly. | |
53 | */ | |
54 | asm volatile("sleep 3\n\t" | |
55 | "sub pc, -2"); | |
5f97f7f9 HS |
56 | } |
57 | ||
58 | void machine_power_off(void) | |
59 | { | |
ed3fa7c9 PM |
60 | if (pm_power_off) |
61 | pm_power_off(); | |
5f97f7f9 HS |
62 | } |
63 | ||
64 | void machine_restart(char *cmd) | |
65 | { | |
8dfe8f29 HS |
66 | ocd_write(DC, (1 << OCD_DC_DBE_BIT)); |
67 | ocd_write(DC, (1 << OCD_DC_RES_BIT)); | |
5f97f7f9 HS |
68 | while (1) ; |
69 | } | |
70 | ||
71 | /* | |
72 | * PC is actually discarded when returning from a system call -- the | |
73 | * return address must be stored in LR. This function will make sure | |
74 | * LR points to do_exit before starting the thread. | |
75 | * | |
76 | * Also, when returning from fork(), r12 is 0, so we must copy the | |
77 | * argument as well. | |
78 | * | |
79 | * r0 : The argument to the main thread function | |
80 | * r1 : The address of do_exit | |
81 | * r2 : The address of the main thread function | |
82 | */ | |
83 | asmlinkage extern void kernel_thread_helper(void); | |
84 | __asm__(" .type kernel_thread_helper, @function\n" | |
85 | "kernel_thread_helper:\n" | |
86 | " mov r12, r0\n" | |
87 | " mov lr, r2\n" | |
88 | " mov pc, r1\n" | |
89 | " .size kernel_thread_helper, . - kernel_thread_helper"); | |
90 | ||
91 | int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) | |
92 | { | |
93 | struct pt_regs regs; | |
94 | ||
95 | memset(®s, 0, sizeof(regs)); | |
96 | ||
97 | regs.r0 = (unsigned long)arg; | |
98 | regs.r1 = (unsigned long)fn; | |
99 | regs.r2 = (unsigned long)do_exit; | |
100 | regs.lr = (unsigned long)kernel_thread_helper; | |
101 | regs.pc = (unsigned long)kernel_thread_helper; | |
102 | regs.sr = MODE_SUPERVISOR; | |
103 | ||
104 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, | |
105 | 0, ®s, 0, NULL, NULL); | |
106 | } | |
107 | EXPORT_SYMBOL(kernel_thread); | |
108 | ||
109 | /* | |
110 | * Free current thread data structures etc | |
111 | */ | |
112 | void exit_thread(void) | |
113 | { | |
13b54a50 | 114 | ocd_disable(current); |
5f97f7f9 HS |
115 | } |
116 | ||
117 | void flush_thread(void) | |
118 | { | |
119 | /* nothing to do */ | |
120 | } | |
121 | ||
122 | void release_thread(struct task_struct *dead_task) | |
123 | { | |
124 | /* do nothing */ | |
125 | } | |
126 | ||
623b0355 HS |
127 | static void dump_mem(const char *str, const char *log_lvl, |
128 | unsigned long bottom, unsigned long top) | |
129 | { | |
130 | unsigned long p; | |
131 | int i; | |
132 | ||
133 | printk("%s%s(0x%08lx to 0x%08lx)\n", log_lvl, str, bottom, top); | |
134 | ||
135 | for (p = bottom & ~31; p < top; ) { | |
136 | printk("%s%04lx: ", log_lvl, p & 0xffff); | |
137 | ||
138 | for (i = 0; i < 8; i++, p += 4) { | |
139 | unsigned int val; | |
140 | ||
141 | if (p < bottom || p >= top) | |
142 | printk(" "); | |
143 | else { | |
144 | if (__get_user(val, (unsigned int __user *)p)) { | |
145 | printk("\n"); | |
146 | goto out; | |
147 | } | |
148 | printk("%08x ", val); | |
149 | } | |
150 | } | |
151 | printk("\n"); | |
152 | } | |
153 | ||
154 | out: | |
155 | return; | |
156 | } | |
157 | ||
158 | static inline int valid_stack_ptr(struct thread_info *tinfo, unsigned long p) | |
159 | { | |
160 | return (p > (unsigned long)tinfo) | |
161 | && (p < (unsigned long)tinfo + THREAD_SIZE - 3); | |
162 | } | |
163 | ||
164 | #ifdef CONFIG_FRAME_POINTER | |
165 | static void show_trace_log_lvl(struct task_struct *tsk, unsigned long *sp, | |
166 | struct pt_regs *regs, const char *log_lvl) | |
167 | { | |
168 | unsigned long lr, fp; | |
169 | struct thread_info *tinfo; | |
170 | ||
171 | if (regs) | |
172 | fp = regs->r7; | |
173 | else if (tsk == current) | |
174 | asm("mov %0, r7" : "=r"(fp)); | |
175 | else | |
176 | fp = tsk->thread.cpu_context.r7; | |
177 | ||
178 | /* | |
179 | * Walk the stack as long as the frame pointer (a) is within | |
180 | * the kernel stack of the task, and (b) it doesn't move | |
181 | * downwards. | |
182 | */ | |
183 | tinfo = task_thread_info(tsk); | |
184 | printk("%sCall trace:\n", log_lvl); | |
185 | while (valid_stack_ptr(tinfo, fp)) { | |
186 | unsigned long new_fp; | |
187 | ||
188 | lr = *(unsigned long *)fp; | |
189 | #ifdef CONFIG_KALLSYMS | |
190 | printk("%s [<%08lx>] ", log_lvl, lr); | |
191 | #else | |
192 | printk(" [<%08lx>] ", lr); | |
193 | #endif | |
194 | print_symbol("%s\n", lr); | |
195 | ||
196 | new_fp = *(unsigned long *)(fp + 4); | |
197 | if (new_fp <= fp) | |
198 | break; | |
199 | fp = new_fp; | |
200 | } | |
201 | printk("\n"); | |
202 | } | |
203 | #else | |
204 | static void show_trace_log_lvl(struct task_struct *tsk, unsigned long *sp, | |
205 | struct pt_regs *regs, const char *log_lvl) | |
206 | { | |
207 | unsigned long addr; | |
208 | ||
209 | printk("%sCall trace:\n", log_lvl); | |
210 | ||
211 | while (!kstack_end(sp)) { | |
212 | addr = *sp++; | |
213 | if (kernel_text_address(addr)) { | |
214 | #ifdef CONFIG_KALLSYMS | |
215 | printk("%s [<%08lx>] ", log_lvl, addr); | |
216 | #else | |
217 | printk(" [<%08lx>] ", addr); | |
218 | #endif | |
219 | print_symbol("%s\n", addr); | |
220 | } | |
221 | } | |
222 | printk("\n"); | |
223 | } | |
224 | #endif | |
225 | ||
226 | void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp, | |
227 | struct pt_regs *regs, const char *log_lvl) | |
228 | { | |
229 | struct thread_info *tinfo; | |
230 | ||
231 | if (sp == 0) { | |
232 | if (tsk) | |
233 | sp = tsk->thread.cpu_context.ksp; | |
234 | else | |
235 | sp = (unsigned long)&tinfo; | |
236 | } | |
237 | if (!tsk) | |
238 | tsk = current; | |
239 | ||
240 | tinfo = task_thread_info(tsk); | |
241 | ||
242 | if (valid_stack_ptr(tinfo, sp)) { | |
243 | dump_mem("Stack: ", log_lvl, sp, | |
244 | THREAD_SIZE + (unsigned long)tinfo); | |
245 | show_trace_log_lvl(tsk, (unsigned long *)sp, regs, log_lvl); | |
246 | } | |
247 | } | |
248 | ||
249 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
250 | { | |
251 | show_stack_log_lvl(tsk, (unsigned long)stack, NULL, ""); | |
252 | } | |
253 | ||
254 | void dump_stack(void) | |
255 | { | |
256 | unsigned long stack; | |
257 | ||
258 | show_trace_log_lvl(current, &stack, NULL, ""); | |
259 | } | |
260 | EXPORT_SYMBOL(dump_stack); | |
261 | ||
5f97f7f9 HS |
262 | static const char *cpu_modes[] = { |
263 | "Application", "Supervisor", "Interrupt level 0", "Interrupt level 1", | |
264 | "Interrupt level 2", "Interrupt level 3", "Exception", "NMI" | |
265 | }; | |
266 | ||
623b0355 | 267 | void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl) |
5f97f7f9 HS |
268 | { |
269 | unsigned long sp = regs->sp; | |
270 | unsigned long lr = regs->lr; | |
271 | unsigned long mode = (regs->sr & MODE_MASK) >> MODE_SHIFT; | |
272 | ||
623b0355 | 273 | if (!user_mode(regs)) { |
5f97f7f9 HS |
274 | sp = (unsigned long)regs + FRAME_SIZE_FULL; |
275 | ||
623b0355 HS |
276 | printk("%s", log_lvl); |
277 | print_symbol("PC is at %s\n", instruction_pointer(regs)); | |
278 | printk("%s", log_lvl); | |
279 | print_symbol("LR is at %s\n", lr); | |
280 | } | |
281 | ||
282 | printk("%spc : [<%08lx>] lr : [<%08lx>] %s\n" | |
283 | "%ssp : %08lx r12: %08lx r11: %08lx\n", | |
284 | log_lvl, instruction_pointer(regs), lr, print_tainted(), | |
285 | log_lvl, sp, regs->r12, regs->r11); | |
286 | printk("%sr10: %08lx r9 : %08lx r8 : %08lx\n", | |
287 | log_lvl, regs->r10, regs->r9, regs->r8); | |
288 | printk("%sr7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", | |
289 | log_lvl, regs->r7, regs->r6, regs->r5, regs->r4); | |
290 | printk("%sr3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", | |
291 | log_lvl, regs->r3, regs->r2, regs->r1, regs->r0); | |
292 | printk("%sFlags: %c%c%c%c%c\n", log_lvl, | |
5f97f7f9 HS |
293 | regs->sr & SR_Q ? 'Q' : 'q', |
294 | regs->sr & SR_V ? 'V' : 'v', | |
295 | regs->sr & SR_N ? 'N' : 'n', | |
296 | regs->sr & SR_Z ? 'Z' : 'z', | |
297 | regs->sr & SR_C ? 'C' : 'c'); | |
df679771 | 298 | printk("%sMode bits: %c%c%c%c%c%c%c%c%c%c\n", log_lvl, |
5f97f7f9 | 299 | regs->sr & SR_H ? 'H' : 'h', |
5f97f7f9 | 300 | regs->sr & SR_J ? 'J' : 'j', |
df679771 HS |
301 | regs->sr & SR_DM ? 'M' : 'm', |
302 | regs->sr & SR_D ? 'D' : 'd', | |
5f97f7f9 HS |
303 | regs->sr & SR_EM ? 'E' : 'e', |
304 | regs->sr & SR_I3M ? '3' : '.', | |
305 | regs->sr & SR_I2M ? '2' : '.', | |
306 | regs->sr & SR_I1M ? '1' : '.', | |
307 | regs->sr & SR_I0M ? '0' : '.', | |
308 | regs->sr & SR_GM ? 'G' : 'g'); | |
623b0355 HS |
309 | printk("%sCPU Mode: %s\n", log_lvl, cpu_modes[mode]); |
310 | printk("%sProcess: %s [%d] (task: %p thread: %p)\n", | |
311 | log_lvl, current->comm, current->pid, current, | |
312 | task_thread_info(current)); | |
313 | } | |
314 | ||
315 | void show_regs(struct pt_regs *regs) | |
316 | { | |
317 | unsigned long sp = regs->sp; | |
318 | ||
319 | if (!user_mode(regs)) | |
320 | sp = (unsigned long)regs + FRAME_SIZE_FULL; | |
5f97f7f9 | 321 | |
623b0355 HS |
322 | show_regs_log_lvl(regs, ""); |
323 | show_trace_log_lvl(current, (unsigned long *)sp, regs, ""); | |
5f97f7f9 HS |
324 | } |
325 | EXPORT_SYMBOL(show_regs); | |
326 | ||
327 | /* Fill in the fpu structure for a core dump. This is easy -- we don't have any */ | |
328 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
329 | { | |
330 | /* Not valid */ | |
331 | return 0; | |
332 | } | |
333 | ||
334 | asmlinkage void ret_from_fork(void); | |
335 | ||
6f2c55b8 | 336 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
5f97f7f9 HS |
337 | unsigned long unused, |
338 | struct task_struct *p, struct pt_regs *regs) | |
339 | { | |
340 | struct pt_regs *childregs; | |
341 | ||
c9f4f06d | 342 | childregs = ((struct pt_regs *)(THREAD_SIZE + (unsigned long)task_stack_page(p))) - 1; |
5f97f7f9 HS |
343 | *childregs = *regs; |
344 | ||
345 | if (user_mode(regs)) | |
346 | childregs->sp = usp; | |
347 | else | |
c9f4f06d | 348 | childregs->sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
5f97f7f9 HS |
349 | |
350 | childregs->r12 = 0; /* Set return value for child */ | |
351 | ||
352 | p->thread.cpu_context.sr = MODE_SUPERVISOR | SR_GM; | |
353 | p->thread.cpu_context.ksp = (unsigned long)childregs; | |
354 | p->thread.cpu_context.pc = (unsigned long)ret_from_fork; | |
355 | ||
325d6f55 | 356 | clear_tsk_thread_flag(p, TIF_DEBUG); |
13b54a50 HS |
357 | if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG)) |
358 | ocd_enable(p); | |
359 | ||
5f97f7f9 HS |
360 | return 0; |
361 | } | |
362 | ||
363 | /* r12-r8 are dummy parameters to force the compiler to use the stack */ | |
364 | asmlinkage int sys_fork(struct pt_regs *regs) | |
365 | { | |
366 | return do_fork(SIGCHLD, regs->sp, regs, 0, NULL, NULL); | |
367 | } | |
368 | ||
369 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
370 | unsigned long parent_tidptr, | |
371 | unsigned long child_tidptr, struct pt_regs *regs) | |
372 | { | |
373 | if (!newsp) | |
374 | newsp = regs->sp; | |
375 | return do_fork(clone_flags, newsp, regs, 0, | |
376 | (int __user *)parent_tidptr, | |
377 | (int __user *)child_tidptr); | |
378 | } | |
379 | ||
380 | asmlinkage int sys_vfork(struct pt_regs *regs) | |
381 | { | |
382 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->sp, regs, | |
383 | 0, NULL, NULL); | |
384 | } | |
385 | ||
386 | asmlinkage int sys_execve(char __user *ufilename, char __user *__user *uargv, | |
387 | char __user *__user *uenvp, struct pt_regs *regs) | |
388 | { | |
389 | int error; | |
390 | char *filename; | |
391 | ||
392 | filename = getname(ufilename); | |
393 | error = PTR_ERR(filename); | |
394 | if (IS_ERR(filename)) | |
395 | goto out; | |
396 | ||
397 | error = do_execve(filename, uargv, uenvp, regs); | |
5f97f7f9 HS |
398 | putname(filename); |
399 | ||
400 | out: | |
401 | return error; | |
402 | } | |
403 | ||
404 | ||
405 | /* | |
406 | * This function is supposed to answer the question "who called | |
407 | * schedule()?" | |
408 | */ | |
409 | unsigned long get_wchan(struct task_struct *p) | |
410 | { | |
411 | unsigned long pc; | |
412 | unsigned long stack_page; | |
413 | ||
414 | if (!p || p == current || p->state == TASK_RUNNING) | |
415 | return 0; | |
416 | ||
c9f4f06d | 417 | stack_page = (unsigned long)task_stack_page(p); |
5f97f7f9 HS |
418 | BUG_ON(!stack_page); |
419 | ||
420 | /* | |
421 | * The stored value of PC is either the address right after | |
422 | * the call to __switch_to() or ret_from_fork. | |
423 | */ | |
424 | pc = thread_saved_pc(p); | |
425 | if (in_sched_functions(pc)) { | |
426 | #ifdef CONFIG_FRAME_POINTER | |
427 | unsigned long fp = p->thread.cpu_context.r7; | |
428 | BUG_ON(fp < stack_page || fp > (THREAD_SIZE + stack_page)); | |
429 | pc = *(unsigned long *)fp; | |
430 | #else | |
431 | /* | |
432 | * We depend on the frame size of schedule here, which | |
433 | * is actually quite ugly. It might be possible to | |
434 | * determine the frame size automatically at build | |
435 | * time by doing this: | |
436 | * - compile sched.c | |
437 | * - disassemble the resulting sched.o | |
438 | * - look for 'sub sp,??' shortly after '<schedule>:' | |
439 | */ | |
440 | unsigned long sp = p->thread.cpu_context.ksp + 16; | |
441 | BUG_ON(sp < stack_page || sp > (THREAD_SIZE + stack_page)); | |
442 | pc = *(unsigned long *)sp; | |
443 | #endif | |
444 | } | |
445 | ||
446 | return pc; | |
447 | } |