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
15 #include <linux/export.h>
16 #include <linux/sched.h>
17 #include <linux/sched/debug.h>
18 #include <linux/sched/task.h>
19 #include <linux/tick.h>
20 #include <linux/uaccess.h>
22 #include <asm/unistd.h>
23 #include <asm/traps.h>
24 #include <asm/cpuinfo.h>
26 asmlinkage void ret_from_fork(void);
27 asmlinkage void ret_from_kernel_thread(void);
29 void (*pm_power_off)(void) = NULL;
30 EXPORT_SYMBOL(pm_power_off);
32 void arch_cpu_idle(void)
38 * The development boards have no way to pull a board reset. Just jump to the
39 * cpu reset address and let the boot loader or the code in head.S take care of
40 * resetting peripherals.
42 void machine_restart(char *__unused)
44 pr_notice("Machine restart (%08x)...\n", cpuinfo.reset_addr);
46 __asm__ __volatile__ (
49 : "r" (cpuinfo.reset_addr)
53 void machine_halt(void)
55 pr_notice("Machine halt...\n");
62 * There is no way to power off the development boards. So just spin for now. If
63 * we ever have a way of resetting a board using a GPIO we should add that here.
65 void machine_power_off(void)
67 pr_notice("Machine power off...\n");
73 void show_regs(struct pt_regs *regs)
76 show_regs_print_info(KERN_DEFAULT);
78 pr_notice("r1: %08lx r2: %08lx r3: %08lx r4: %08lx\n",
79 regs->r1, regs->r2, regs->r3, regs->r4);
81 pr_notice("r5: %08lx r6: %08lx r7: %08lx r8: %08lx\n",
82 regs->r5, regs->r6, regs->r7, regs->r8);
84 pr_notice("r9: %08lx r10: %08lx r11: %08lx r12: %08lx\n",
85 regs->r9, regs->r10, regs->r11, regs->r12);
87 pr_notice("r13: %08lx r14: %08lx r15: %08lx\n",
88 regs->r13, regs->r14, regs->r15);
90 pr_notice("ra: %08lx fp: %08lx sp: %08lx gp: %08lx\n",
91 regs->ra, regs->fp, regs->sp, regs->gp);
93 pr_notice("ea: %08lx estatus: %08lx\n",
94 regs->ea, regs->estatus);
97 void flush_thread(void)
101 int copy_thread(unsigned long clone_flags,
102 unsigned long usp, unsigned long arg, struct task_struct *p)
104 struct pt_regs *childregs = task_pt_regs(p);
105 struct pt_regs *regs;
106 struct switch_stack *stack;
107 struct switch_stack *childstack =
108 ((struct switch_stack *)childregs) - 1;
110 if (unlikely(p->flags & PF_KTHREAD)) {
111 memset(childstack, 0,
112 sizeof(struct switch_stack) + sizeof(struct pt_regs));
114 childstack->r16 = usp; /* fn */
115 childstack->r17 = arg;
116 childstack->ra = (unsigned long) ret_from_kernel_thread;
117 childregs->estatus = STATUS_PIE;
118 childregs->sp = (unsigned long) childstack;
120 p->thread.ksp = (unsigned long) childstack;
121 p->thread.kregs = childregs;
125 regs = current_pt_regs();
127 childregs->r2 = 0; /* Set the return value for the child. */
130 stack = ((struct switch_stack *) regs) - 1;
131 *childstack = *stack;
132 childstack->ra = (unsigned long)ret_from_fork;
133 p->thread.kregs = childregs;
134 p->thread.ksp = (unsigned long) childstack;
139 /* Initialize tls register. */
140 if (clone_flags & CLONE_SETTLS)
141 childstack->r23 = regs->r8;
147 * Generic dumping code. Used for panic and debug.
149 void dump(struct pt_regs *fp)
155 pr_emerg("\nCURRENT PROCESS:\n\n");
156 pr_emerg("COMM=%s PID=%d\n", current->comm, current->pid);
159 pr_emerg("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
160 (int) current->mm->start_code,
161 (int) current->mm->end_code,
162 (int) current->mm->start_data,
163 (int) current->mm->end_data,
164 (int) current->mm->end_data,
165 (int) current->mm->brk);
166 pr_emerg("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
167 (int) current->mm->start_stack,
168 (int)(((unsigned long) current) + THREAD_SIZE));
171 pr_emerg("PC: %08lx\n", fp->ea);
172 pr_emerg("SR: %08lx SP: %08lx\n",
173 (long) fp->estatus, (long) fp);
175 pr_emerg("r1: %08lx r2: %08lx r3: %08lx\n",
176 fp->r1, fp->r2, fp->r3);
178 pr_emerg("r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n",
179 fp->r4, fp->r5, fp->r6, fp->r7);
180 pr_emerg("r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n",
181 fp->r8, fp->r9, fp->r10, fp->r11);
182 pr_emerg("r12: %08lx r13: %08lx r14: %08lx r15: %08lx\n",
183 fp->r12, fp->r13, fp->r14, fp->r15);
184 pr_emerg("or2: %08lx ra: %08lx fp: %08lx sp: %08lx\n",
185 fp->orig_r2, fp->ra, fp->fp, fp->sp);
186 pr_emerg("\nUSP: %08x TRAPFRAME: %08x\n",
187 (unsigned int) fp->sp, (unsigned int) fp);
190 tp = ((unsigned char *) fp->ea) - 0x20;
191 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
193 pr_emerg("\n%08x: ", (int) (tp + i));
194 pr_emerg("%08x ", (int) *sp++);
198 pr_emerg("\nKERNEL STACK:");
199 tp = ((unsigned char *) fp) - 0x40;
200 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
202 pr_emerg("\n%08x: ", (int) (tp + i));
203 pr_emerg("%08x ", (int) *sp++);
208 pr_emerg("\nUSER STACK:");
209 tp = (unsigned char *) (fp->sp - 0x10);
210 for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
212 pr_emerg("\n%08x: ", (int) (tp + i));
213 pr_emerg("%08x ", (int) *sp++);
218 unsigned long get_wchan(struct task_struct *p)
220 unsigned long fp, pc;
221 unsigned long stack_page;
224 if (!p || p == current || p->state == TASK_RUNNING)
227 stack_page = (unsigned long)p;
228 fp = ((struct switch_stack *)p->thread.ksp)->fp; /* ;dgt2 */
230 if (fp < stack_page+sizeof(struct task_struct) ||
231 fp >= 8184+stack_page) /* ;dgt2;tmp */
233 pc = ((unsigned long *)fp)[1];
234 if (!in_sched_functions(pc))
236 fp = *(unsigned long *) fp;
237 } while (count++ < 16); /* ;dgt2;tmp */
242 * Do necessary setup to start up a newly executed thread.
243 * Will startup in user mode (status_extension = 0).
245 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
247 memset((void *) regs, 0, sizeof(struct pt_regs));
248 regs->estatus = ESTATUS_EPIE | ESTATUS_EU;
253 #include <linux/elfcore.h>
255 /* Fill in the FPU structure for a core dump. */
256 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
258 return 0; /* Nios2 has no FPU and thus no FPU registers */