Linux 4.8-rc8
[linux/fpc-iii.git] / arch / avr32 / kernel / process.c
blob68e5b9dac0596bad7a4c5722aae50ff8b1694187
1 /*
2 * Copyright (C) 2004-2006 Atmel Corporation
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>
20 #include <asm/sysreg.h>
21 #include <asm/ocd.h>
22 #include <asm/syscalls.h>
24 #include <mach/pm.h>
26 void (*pm_power_off)(void);
27 EXPORT_SYMBOL(pm_power_off);
30 * This file handles the architecture-dependent parts of process handling..
33 void arch_cpu_idle(void)
35 cpu_enter_idle();
38 void machine_halt(void)
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.
45 asm volatile("sleep 3\n\t"
46 "sub pc, -2");
49 void machine_power_off(void)
51 if (pm_power_off)
52 pm_power_off();
55 void machine_restart(char *cmd)
57 ocd_write(DC, (1 << OCD_DC_DBE_BIT));
58 ocd_write(DC, (1 << OCD_DC_RES_BIT));
59 while (1) ;
63 * Free current thread data structures etc
65 void exit_thread(struct task_struct *tsk)
67 ocd_disable(tsk);
70 void flush_thread(void)
72 /* nothing to do */
75 void release_thread(struct task_struct *dead_task)
77 /* do nothing */
80 static void dump_mem(const char *str, const char *log_lvl,
81 unsigned long bottom, unsigned long top)
83 unsigned long p;
84 int i;
86 printk("%s%s(0x%08lx to 0x%08lx)\n", log_lvl, str, bottom, top);
88 for (p = bottom & ~31; p < top; ) {
89 printk("%s%04lx: ", log_lvl, p & 0xffff);
91 for (i = 0; i < 8; i++, p += 4) {
92 unsigned int val;
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;
101 printk("%08x ", val);
104 printk("\n");
107 out:
108 return;
111 static inline int valid_stack_ptr(struct thread_info *tinfo, unsigned long p)
113 return (p > (unsigned long)tinfo)
114 && (p < (unsigned long)tinfo + THREAD_SIZE - 3);
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)
121 unsigned long lr, fp;
122 struct thread_info *tinfo;
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;
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.
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;
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);
149 new_fp = *(unsigned long *)(fp + 4);
150 if (new_fp <= fp)
151 break;
152 fp = new_fp;
154 printk("\n");
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)
160 unsigned long addr;
162 printk("%sCall trace:\n", log_lvl);
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);
175 printk("\n");
177 #endif
179 void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
180 struct pt_regs *regs, const char *log_lvl)
182 struct thread_info *tinfo;
184 if (sp == 0) {
185 if (tsk)
186 sp = tsk->thread.cpu_context.ksp;
187 else
188 sp = (unsigned long)&tinfo;
190 if (!tsk)
191 tsk = current;
193 tinfo = task_thread_info(tsk);
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);
202 void show_stack(struct task_struct *tsk, unsigned long *stack)
204 show_stack_log_lvl(tsk, (unsigned long)stack, NULL, "");
207 static const char *cpu_modes[] = {
208 "Application", "Supervisor", "Interrupt level 0", "Interrupt level 1",
209 "Interrupt level 2", "Interrupt level 3", "Exception", "NMI"
212 void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl)
214 unsigned long sp = regs->sp;
215 unsigned long lr = regs->lr;
216 unsigned long mode = (regs->sr & MODE_MASK) >> MODE_SHIFT;
218 show_regs_print_info(log_lvl);
220 if (!user_mode(regs)) {
221 sp = (unsigned long)regs + FRAME_SIZE_FULL;
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);
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 ? '0' : '.',
255 regs->sr & SR_GM ? 'G' : 'g');
256 printk("%sCPU Mode: %s\n", log_lvl, cpu_modes[mode]);
259 void show_regs(struct pt_regs *regs)
261 unsigned long sp = regs->sp;
263 if (!user_mode(regs))
264 sp = (unsigned long)regs + FRAME_SIZE_FULL;
266 show_regs_log_lvl(regs, "");
267 show_trace_log_lvl(current, (unsigned long *)sp, regs, "");
269 EXPORT_SYMBOL(show_regs);
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)
274 /* Not valid */
275 return 0;
278 asmlinkage void ret_from_fork(void);
279 asmlinkage void ret_from_kernel_thread(void);
280 asmlinkage void syscall_return(void);
282 int copy_thread(unsigned long clone_flags, unsigned long usp,
283 unsigned long arg,
284 struct task_struct *p)
286 struct pt_regs *childregs = task_pt_regs(p);
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;
303 p->thread.cpu_context.sr = MODE_SUPERVISOR | SR_GM;
304 p->thread.cpu_context.ksp = (unsigned long)childregs;
306 clear_tsk_thread_flag(p, TIF_DEBUG);
307 if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG))
308 ocd_enable(p);
310 return 0;
314 * This function is supposed to answer the question "who called
315 * schedule()?"
317 unsigned long get_wchan(struct task_struct *p)
319 unsigned long pc;
320 unsigned long stack_page;
322 if (!p || p == current || p->state == TASK_RUNNING)
323 return 0;
325 stack_page = (unsigned long)task_stack_page(p);
326 BUG_ON(!stack_page);
329 * The stored value of PC is either the address right after
330 * the call to __switch_to() or ret_from_fork.
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
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>:'
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
354 return pc;