Linux 4.6-rc6
[linux/fpc-iii.git] / arch / nios2 / kernel / process.c
blob2f8c74f93e705a08e28f2c7a9e6ba9da754ff187
1 /*
2 * Architecture-dependent parts of process handling.
4 * Copyright (C) 2013 Altera Corporation
5 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
6 * Copyright (C) 2009 Wind River Systems Inc
7 * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
8 * Copyright (C) 2004 Microtronix Datacom Ltd
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main directory of this archive
12 * for more details.
15 #include <linux/export.h>
16 #include <linux/sched.h>
17 #include <linux/tick.h>
18 #include <linux/uaccess.h>
20 #include <asm/unistd.h>
21 #include <asm/traps.h>
22 #include <asm/cpuinfo.h>
24 asmlinkage void ret_from_fork(void);
25 asmlinkage void ret_from_kernel_thread(void);
27 void (*pm_power_off)(void) = NULL;
28 EXPORT_SYMBOL(pm_power_off);
30 void arch_cpu_idle(void)
32 local_irq_enable();
36 * The development boards have no way to pull a board reset. Just jump to the
37 * cpu reset address and let the boot loader or the code in head.S take care of
38 * resetting peripherals.
40 void machine_restart(char *__unused)
42 pr_notice("Machine restart (%08x)...\n", cpuinfo.reset_addr);
43 local_irq_disable();
44 __asm__ __volatile__ (
45 "jmp %0\n\t"
47 : "r" (cpuinfo.reset_addr)
48 : "r4");
51 void machine_halt(void)
53 pr_notice("Machine halt...\n");
54 local_irq_disable();
55 for (;;)
60 * There is no way to power off the development boards. So just spin for now. If
61 * we ever have a way of resetting a board using a GPIO we should add that here.
63 void machine_power_off(void)
65 pr_notice("Machine power off...\n");
66 local_irq_disable();
67 for (;;)
71 void show_regs(struct pt_regs *regs)
73 pr_notice("\n");
74 show_regs_print_info(KERN_DEFAULT);
76 pr_notice("r1: %08lx r2: %08lx r3: %08lx r4: %08lx\n",
77 regs->r1, regs->r2, regs->r3, regs->r4);
79 pr_notice("r5: %08lx r6: %08lx r7: %08lx r8: %08lx\n",
80 regs->r5, regs->r6, regs->r7, regs->r8);
82 pr_notice("r9: %08lx r10: %08lx r11: %08lx r12: %08lx\n",
83 regs->r9, regs->r10, regs->r11, regs->r12);
85 pr_notice("r13: %08lx r14: %08lx r15: %08lx\n",
86 regs->r13, regs->r14, regs->r15);
88 pr_notice("ra: %08lx fp: %08lx sp: %08lx gp: %08lx\n",
89 regs->ra, regs->fp, regs->sp, regs->gp);
91 pr_notice("ea: %08lx estatus: %08lx\n",
92 regs->ea, regs->estatus);
95 void flush_thread(void)
99 int copy_thread(unsigned long clone_flags,
100 unsigned long usp, unsigned long arg, struct task_struct *p)
102 struct pt_regs *childregs = task_pt_regs(p);
103 struct pt_regs *regs;
104 struct switch_stack *stack;
105 struct switch_stack *childstack =
106 ((struct switch_stack *)childregs) - 1;
108 if (unlikely(p->flags & PF_KTHREAD)) {
109 memset(childstack, 0,
110 sizeof(struct switch_stack) + sizeof(struct pt_regs));
112 childstack->r16 = usp; /* fn */
113 childstack->r17 = arg;
114 childstack->ra = (unsigned long) ret_from_kernel_thread;
115 childregs->estatus = STATUS_PIE;
116 childregs->sp = (unsigned long) childstack;
118 p->thread.ksp = (unsigned long) childstack;
119 p->thread.kregs = childregs;
120 return 0;
123 regs = current_pt_regs();
124 *childregs = *regs;
125 childregs->r2 = 0; /* Set the return value for the child. */
126 childregs->r7 = 0;
128 stack = ((struct switch_stack *) regs) - 1;
129 *childstack = *stack;
130 childstack->ra = (unsigned long)ret_from_fork;
131 p->thread.kregs = childregs;
132 p->thread.ksp = (unsigned long) childstack;
134 if (usp)
135 childregs->sp = usp;
137 /* Initialize tls register. */
138 if (clone_flags & CLONE_SETTLS)
139 childstack->r23 = regs->r8;
141 return 0;
145 * Generic dumping code. Used for panic and debug.
147 void dump(struct pt_regs *fp)
149 unsigned long *sp;
150 unsigned char *tp;
151 int i;
153 pr_emerg("\nCURRENT PROCESS:\n\n");
154 pr_emerg("COMM=%s PID=%d\n", current->comm, current->pid);
156 if (current->mm) {
157 pr_emerg("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
158 (int) current->mm->start_code,
159 (int) current->mm->end_code,
160 (int) current->mm->start_data,
161 (int) current->mm->end_data,
162 (int) current->mm->end_data,
163 (int) current->mm->brk);
164 pr_emerg("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
165 (int) current->mm->start_stack,
166 (int)(((unsigned long) current) + THREAD_SIZE));
169 pr_emerg("PC: %08lx\n", fp->ea);
170 pr_emerg("SR: %08lx SP: %08lx\n",
171 (long) fp->estatus, (long) fp);
173 pr_emerg("r1: %08lx r2: %08lx r3: %08lx\n",
174 fp->r1, fp->r2, fp->r3);
176 pr_emerg("r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n",
177 fp->r4, fp->r5, fp->r6, fp->r7);
178 pr_emerg("r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n",
179 fp->r8, fp->r9, fp->r10, fp->r11);
180 pr_emerg("r12: %08lx r13: %08lx r14: %08lx r15: %08lx\n",
181 fp->r12, fp->r13, fp->r14, fp->r15);
182 pr_emerg("or2: %08lx ra: %08lx fp: %08lx sp: %08lx\n",
183 fp->orig_r2, fp->ra, fp->fp, fp->sp);
184 pr_emerg("\nUSP: %08x TRAPFRAME: %08x\n",
185 (unsigned int) fp->sp, (unsigned int) fp);
187 pr_emerg("\nCODE:");
188 tp = ((unsigned char *) fp->ea) - 0x20;
189 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
190 if ((i % 0x10) == 0)
191 pr_emerg("\n%08x: ", (int) (tp + i));
192 pr_emerg("%08x ", (int) *sp++);
194 pr_emerg("\n");
196 pr_emerg("\nKERNEL STACK:");
197 tp = ((unsigned char *) fp) - 0x40;
198 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
199 if ((i % 0x10) == 0)
200 pr_emerg("\n%08x: ", (int) (tp + i));
201 pr_emerg("%08x ", (int) *sp++);
203 pr_emerg("\n");
204 pr_emerg("\n");
206 pr_emerg("\nUSER STACK:");
207 tp = (unsigned char *) (fp->sp - 0x10);
208 for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
209 if ((i % 0x10) == 0)
210 pr_emerg("\n%08x: ", (int) (tp + i));
211 pr_emerg("%08x ", (int) *sp++);
213 pr_emerg("\n\n");
216 unsigned long get_wchan(struct task_struct *p)
218 unsigned long fp, pc;
219 unsigned long stack_page;
220 int count = 0;
222 if (!p || p == current || p->state == TASK_RUNNING)
223 return 0;
225 stack_page = (unsigned long)p;
226 fp = ((struct switch_stack *)p->thread.ksp)->fp; /* ;dgt2 */
227 do {
228 if (fp < stack_page+sizeof(struct task_struct) ||
229 fp >= 8184+stack_page) /* ;dgt2;tmp */
230 return 0;
231 pc = ((unsigned long *)fp)[1];
232 if (!in_sched_functions(pc))
233 return pc;
234 fp = *(unsigned long *) fp;
235 } while (count++ < 16); /* ;dgt2;tmp */
236 return 0;
240 * Do necessary setup to start up a newly executed thread.
241 * Will startup in user mode (status_extension = 0).
243 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
245 memset((void *) regs, 0, sizeof(struct pt_regs));
246 regs->estatus = ESTATUS_EPIE | ESTATUS_EU;
247 regs->ea = pc;
248 regs->sp = sp;
251 #include <linux/elfcore.h>
253 /* Fill in the FPU structure for a core dump. */
254 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
256 return 0; /* Nios2 has no FPU and thus no FPU registers */