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Linux/arch/avr32/kernel/process.c

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  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>
 12 #include <linux/pm.h>
 13 #include <linux/ptrace.h>
 14 #include <linux/slab.h>
 15 #include <linux/reboot.h>
 16 #include <linux/tick.h>
 17 #include <linux/uaccess.h>
 18 #include <linux/unistd.h>
 19 
 20 #include <asm/sysreg.h>
 21 #include <asm/ocd.h>
 22 #include <asm/syscalls.h>
 23 
 24 #include <mach/pm.h>
 25 
 26 void (*pm_power_off)(void);
 27 EXPORT_SYMBOL(pm_power_off);
 28 
 29 /*
 30  * This file handles the architecture-dependent parts of process handling..
 31  */
 32 
 33 void arch_cpu_idle(void)
 34 {
 35         cpu_enter_idle();
 36 }
 37 
 38 void machine_halt(void)
 39 {
 40         /*
 41          * Enter Stop mode. The 32 kHz oscillator will keep running so
 42          * the RTC will keep the time properly and the system will
 43          * boot quickly.
 44          */
 45         asm volatile("sleep 3\n\t"
 46                      "sub pc, -2");
 47 }
 48 
 49 void machine_power_off(void)
 50 {
 51         if (pm_power_off)
 52                 pm_power_off();
 53 }
 54 
 55 void machine_restart(char *cmd)
 56 {
 57         ocd_write(DC, (1 << OCD_DC_DBE_BIT));
 58         ocd_write(DC, (1 << OCD_DC_RES_BIT));
 59         while (1) ;
 60 }
 61 
 62 /*
 63  * Free current thread data structures etc
 64  */
 65 void exit_thread(struct task_struct *tsk)
 66 {
 67         ocd_disable(tsk);
 68 }
 69 
 70 void flush_thread(void)
 71 {
 72         /* nothing to do */
 73 }
 74 
 75 void release_thread(struct task_struct *dead_task)
 76 {
 77         /* do nothing */
 78 }
 79 
 80 static void dump_mem(const char *str, const char *log_lvl,
 81                      unsigned long bottom, unsigned long top)
 82 {
 83         unsigned long p;
 84         int i;
 85 
 86         printk("%s%s(0x%08lx to 0x%08lx)\n", log_lvl, str, bottom, top);
 87 
 88         for (p = bottom & ~31; p < top; ) {
 89                 printk("%s%04lx: ", log_lvl, p & 0xffff);
 90 
 91                 for (i = 0; i < 8; i++, p += 4) {
 92                         unsigned int val;
 93 
 94                         if (p < bottom || p >= top)
 95                                 printk("         ");
 96                         else {
 97                                 if (__get_user(val, (unsigned int __user *)p)) {
 98                                         printk("\n");
 99                                         goto out;
100                                 }
101                                 printk("%08x ", val);
102                         }
103                 }
104                 printk("\n");
105         }
106 
107 out:
108         return;
109 }
110 
111 static inline int valid_stack_ptr(struct thread_info *tinfo, unsigned long p)
112 {
113         return (p > (unsigned long)tinfo)
114                 && (p < (unsigned long)tinfo + THREAD_SIZE - 3);
115 }
116 
117 #ifdef CONFIG_FRAME_POINTER
118 static void show_trace_log_lvl(struct task_struct *tsk, unsigned long *sp,
119                                struct pt_regs *regs, const char *log_lvl)
120 {
121         unsigned long lr, fp;
122         struct thread_info *tinfo;
123 
124         if (regs)
125                 fp = regs->r7;
126         else if (tsk == current)
127                 asm("mov %0, r7" : "=r"(fp));
128         else
129                 fp = tsk->thread.cpu_context.r7;
130 
131         /*
132          * Walk the stack as long as the frame pointer (a) is within
133          * the kernel stack of the task, and (b) it doesn't move
134          * downwards.
135          */
136         tinfo = task_thread_info(tsk);
137         printk("%sCall trace:\n", log_lvl);
138         while (valid_stack_ptr(tinfo, fp)) {
139                 unsigned long new_fp;
140 
141                 lr = *(unsigned long *)fp;
142 #ifdef CONFIG_KALLSYMS
143                 printk("%s [<%08lx>] ", log_lvl, lr);
144 #else
145                 printk(" [<%08lx>] ", lr);
146 #endif
147                 print_symbol("%s\n", lr);
148 
149                 new_fp = *(unsigned long *)(fp + 4);
150                 if (new_fp <= fp)
151                         break;
152                 fp = new_fp;
153         }
154         printk("\n");
155 }
156 #else
157 static void show_trace_log_lvl(struct task_struct *tsk, unsigned long *sp,
158                                struct pt_regs *regs, const char *log_lvl)
159 {
160         unsigned long addr;
161 
162         printk("%sCall trace:\n", log_lvl);
163 
164         while (!kstack_end(sp)) {
165                 addr = *sp++;
166                 if (kernel_text_address(addr)) {
167 #ifdef CONFIG_KALLSYMS
168                         printk("%s [<%08lx>] ", log_lvl, addr);
169 #else
170                         printk(" [<%08lx>] ", addr);
171 #endif
172                         print_symbol("%s\n", addr);
173                 }
174         }
175         printk("\n");
176 }
177 #endif
178 
179 void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
180                         struct pt_regs *regs, const char *log_lvl)
181 {
182         struct thread_info *tinfo;
183 
184         if (sp == 0) {
185                 if (tsk)
186                         sp = tsk->thread.cpu_context.ksp;
187                 else
188                         sp = (unsigned long)&tinfo;
189         }
190         if (!tsk)
191                 tsk = current;
192 
193         tinfo = task_thread_info(tsk);
194 
195         if (valid_stack_ptr(tinfo, sp)) {
196                 dump_mem("Stack: ", log_lvl, sp,
197                          THREAD_SIZE + (unsigned long)tinfo);
198                 show_trace_log_lvl(tsk, (unsigned long *)sp, regs, log_lvl);
199         }
200 }
201 
202 void show_stack(struct task_struct *tsk, unsigned long *stack)
203 {
204         show_stack_log_lvl(tsk, (unsigned long)stack, NULL, "");
205 }
206 
207 static const char *cpu_modes[] = {
208         "Application", "Supervisor", "Interrupt level 0", "Interrupt level 1",
209         "Interrupt level 2", "Interrupt level 3", "Exception", "NMI"
210 };
211 
212 void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl)
213 {
214         unsigned long sp = regs->sp;
215         unsigned long lr = regs->lr;
216         unsigned long mode = (regs->sr & MODE_MASK) >> MODE_SHIFT;
217 
218         show_regs_print_info(log_lvl);
219 
220         if (!user_mode(regs)) {
221                 sp = (unsigned long)regs + FRAME_SIZE_FULL;
222 
223                 printk("%s", log_lvl);
224                 print_symbol("PC is at %s\n", instruction_pointer(regs));
225                 printk("%s", log_lvl);
226                 print_symbol("LR is at %s\n", lr);
227         }
228 
229         printk("%spc : [<%08lx>]    lr : [<%08lx>]    %s\n"
230                "%ssp : %08lx  r12: %08lx  r11: %08lx\n",
231                log_lvl, instruction_pointer(regs), lr, print_tainted(),
232                log_lvl, sp, regs->r12, regs->r11);
233         printk("%sr10: %08lx  r9 : %08lx  r8 : %08lx\n",
234                log_lvl, regs->r10, regs->r9, regs->r8);
235         printk("%sr7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
236                log_lvl, regs->r7, regs->r6, regs->r5, regs->r4);
237         printk("%sr3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
238                log_lvl, regs->r3, regs->r2, regs->r1, regs->r0);
239         printk("%sFlags: %c%c%c%c%c\n", log_lvl,
240                regs->sr & SR_Q ? 'Q' : 'q',
241                regs->sr & SR_V ? 'V' : 'v',
242                regs->sr & SR_N ? 'N' : 'n',
243                regs->sr & SR_Z ? 'Z' : 'z',
244                regs->sr & SR_C ? 'C' : 'c');
245         printk("%sMode bits: %c%c%c%c%c%c%c%c%c%c\n", log_lvl,
246                regs->sr & SR_H ? 'H' : 'h',
247                regs->sr & SR_J ? 'J' : 'j',
248                regs->sr & SR_DM ? 'M' : 'm',
249                regs->sr & SR_D ? 'D' : 'd',
250                regs->sr & SR_EM ? 'E' : 'e',
251                regs->sr & SR_I3M ? '3' : '.',
252                regs->sr & SR_I2M ? '2' : '.',
253                regs->sr & SR_I1M ? '1' : '.',
254                regs->sr & SR_I0M ? '' : '.',
255                regs->sr & SR_GM ? 'G' : 'g');
256         printk("%sCPU Mode: %s\n", log_lvl, cpu_modes[mode]);
257 }
258 
259 void show_regs(struct pt_regs *regs)
260 {
261         unsigned long sp = regs->sp;
262 
263         if (!user_mode(regs))
264                 sp = (unsigned long)regs + FRAME_SIZE_FULL;
265 
266         show_regs_log_lvl(regs, "");
267         show_trace_log_lvl(current, (unsigned long *)sp, regs, "");
268 }
269 EXPORT_SYMBOL(show_regs);
270 
271 /* Fill in the fpu structure for a core dump. This is easy -- we don't have any */
272 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
273 {
274         /* Not valid */
275         return 0;
276 }
277 
278 asmlinkage void ret_from_fork(void);
279 asmlinkage void ret_from_kernel_thread(void);
280 asmlinkage void syscall_return(void);
281 
282 int copy_thread(unsigned long clone_flags, unsigned long usp,
283                 unsigned long arg,
284                 struct task_struct *p)
285 {
286         struct pt_regs *childregs = task_pt_regs(p);
287 
288         if (unlikely(p->flags & PF_KTHREAD)) {
289                 memset(childregs, 0, sizeof(struct pt_regs));
290                 p->thread.cpu_context.r0 = arg;
291                 p->thread.cpu_context.r1 = usp; /* fn */
292                 p->thread.cpu_context.r2 = (unsigned long)syscall_return;
293                 p->thread.cpu_context.pc = (unsigned long)ret_from_kernel_thread;
294                 childregs->sr = MODE_SUPERVISOR;
295         } else {
296                 *childregs = *current_pt_regs();
297                 if (usp)
298                         childregs->sp = usp;
299                 childregs->r12 = 0; /* Set return value for child */
300                 p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
301         }
302 
303         p->thread.cpu_context.sr = MODE_SUPERVISOR | SR_GM;
304         p->thread.cpu_context.ksp = (unsigned long)childregs;
305 
306         clear_tsk_thread_flag(p, TIF_DEBUG);
307         if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG))
308                 ocd_enable(p);
309 
310         return 0;
311 }
312 
313 /*
314  * This function is supposed to answer the question "who called
315  * schedule()?"
316  */
317 unsigned long get_wchan(struct task_struct *p)
318 {
319         unsigned long pc;
320         unsigned long stack_page;
321 
322         if (!p || p == current || p->state == TASK_RUNNING)
323                 return 0;
324 
325         stack_page = (unsigned long)task_stack_page(p);
326         BUG_ON(!stack_page);
327 
328         /*
329          * The stored value of PC is either the address right after
330          * the call to __switch_to() or ret_from_fork.
331          */
332         pc = thread_saved_pc(p);
333         if (in_sched_functions(pc)) {
334 #ifdef CONFIG_FRAME_POINTER
335                 unsigned long fp = p->thread.cpu_context.r7;
336                 BUG_ON(fp < stack_page || fp > (THREAD_SIZE + stack_page));
337                 pc = *(unsigned long *)fp;
338 #else
339                 /*
340                  * We depend on the frame size of schedule here, which
341                  * is actually quite ugly. It might be possible to
342                  * determine the frame size automatically at build
343                  * time by doing this:
344                  *   - compile sched/core.c
345                  *   - disassemble the resulting sched.o
346                  *   - look for 'sub sp,??' shortly after '<schedule>:'
347                  */
348                 unsigned long sp = p->thread.cpu_context.ksp + 16;
349                 BUG_ON(sp < stack_page || sp > (THREAD_SIZE + stack_page));
350                 pc = *(unsigned long *)sp;
351 #endif
352         }
353 
354         return pc;
355 }
356 

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