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1/*
2 * Architecture-dependent parts of process handling.
3 *
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
9 *
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.
13 */
14
15#include <linux/export.h>
16#include <linux/sched.h>
17#include <linux/tick.h>
18#include <linux/uaccess.h>
19
20#include <asm/unistd.h>
21#include <asm/traps.h>
22#include <asm/cpuinfo.h>
23
24asmlinkage void ret_from_fork(void);
25asmlinkage void ret_from_kernel_thread(void);
26
27void (*pm_power_off)(void) = NULL;
28EXPORT_SYMBOL(pm_power_off);
29
30void arch_cpu_idle(void)
31{
32 local_irq_enable();
33}
34
35/*
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.
39 */
40void machine_restart(char *__unused)
41{
42 pr_notice("Machine restart (%08x)...\n", cpuinfo.reset_addr);
43 local_irq_disable();
44 __asm__ __volatile__ (
45 "jmp %0\n\t"
46 :
47 : "r" (cpuinfo.reset_addr)
48 : "r4");
49}
50
51void machine_halt(void)
52{
53 pr_notice("Machine halt...\n");
54 local_irq_disable();
55 for (;;)
56 ;
57}
58
59/*
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.
62 */
63void machine_power_off(void)
64{
65 pr_notice("Machine power off...\n");
66 local_irq_disable();
67 for (;;)
68 ;
69}
70
71void show_regs(struct pt_regs *regs)
72{
73 pr_notice("\n");
74 show_regs_print_info(KERN_DEFAULT);
75
76 pr_notice("r1: %08lx r2: %08lx r3: %08lx r4: %08lx\n",
77 regs->r1, regs->r2, regs->r3, regs->r4);
78
79 pr_notice("r5: %08lx r6: %08lx r7: %08lx r8: %08lx\n",
80 regs->r5, regs->r6, regs->r7, regs->r8);
81
82 pr_notice("r9: %08lx r10: %08lx r11: %08lx r12: %08lx\n",
83 regs->r9, regs->r10, regs->r11, regs->r12);
84
85 pr_notice("r13: %08lx r14: %08lx r15: %08lx\n",
86 regs->r13, regs->r14, regs->r15);
87
88 pr_notice("ra: %08lx fp: %08lx sp: %08lx gp: %08lx\n",
89 regs->ra, regs->fp, regs->sp, regs->gp);
90
91 pr_notice("ea: %08lx estatus: %08lx\n",
92 regs->ea, regs->estatus);
93}
94
95void flush_thread(void)
96{
97}
98
99int copy_thread(unsigned long clone_flags,
100 unsigned long usp, unsigned long arg, struct task_struct *p)
101{
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;
107
108 if (unlikely(p->flags & PF_KTHREAD)) {
109 memset(childstack, 0,
110 sizeof(struct switch_stack) + sizeof(struct pt_regs));
111
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;
117
118 p->thread.ksp = (unsigned long) childstack;
119 p->thread.kregs = childregs;
120 return 0;
121 }
122
123 regs = current_pt_regs();
124 *childregs = *regs;
125 childregs->r2 = 0; /* Set the return value for the child. */
126 childregs->r7 = 0;
127
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;
133
134 if (usp)
135 childregs->sp = usp;
136
137 /* Initialize tls register. */
138 if (clone_flags & CLONE_SETTLS)
139 childstack->r23 = regs->r8;
140
141 return 0;
142}
143
144/*
145 * Generic dumping code. Used for panic and debug.
146 */
147void dump(struct pt_regs *fp)
148{
149 unsigned long *sp;
150 unsigned char *tp;
151 int i;
152
153 pr_emerg("\nCURRENT PROCESS:\n\n");
154 pr_emerg("COMM=%s PID=%d\n", current->comm, current->pid);
155
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));
167 }
168
169 pr_emerg("PC: %08lx\n", fp->ea);
170 pr_emerg("SR: %08lx SP: %08lx\n",
171 (long) fp->estatus, (long) fp);
172
173 pr_emerg("r1: %08lx r2: %08lx r3: %08lx\n",
174 fp->r1, fp->r2, fp->r3);
175
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);
186
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++);
193 }
194 pr_emerg("\n");
195
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++);
202 }
203 pr_emerg("\n");
204 pr_emerg("\n");
205
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++);
212 }
213 pr_emerg("\n\n");
214}
215
216unsigned long get_wchan(struct task_struct *p)
217{
218 unsigned long fp, pc;
219 unsigned long stack_page;
220 int count = 0;
221
222 if (!p || p == current || p->state == TASK_RUNNING)
223 return 0;
224
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;
237}
238
239/*
240 * Do necessary setup to start up a newly executed thread.
241 * Will startup in user mode (status_extension = 0).
242 */
243void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
244{
245 memset((void *) regs, 0, sizeof(struct pt_regs));
246 regs->estatus = ESTATUS_EPIE | ESTATUS_EU;
247 regs->ea = pc;
248 regs->sp = sp;
249}
250
251#include <linux/elfcore.h>
252
253/* Fill in the FPU structure for a core dump. */
254int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
255{
256 return 0; /* Nios2 has no FPU and thus no FPU registers */
257}
1/*
2 * Architecture-dependent parts of process handling.
3 *
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
9 *
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.
13 */
14
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/sched/task_stack.h>
20#include <linux/mm_types.h>
21#include <linux/tick.h>
22#include <linux/uaccess.h>
23
24#include <asm/unistd.h>
25#include <asm/traps.h>
26#include <asm/cpuinfo.h>
27
28asmlinkage void ret_from_fork(void);
29asmlinkage void ret_from_kernel_thread(void);
30
31void (*pm_power_off)(void) = NULL;
32EXPORT_SYMBOL(pm_power_off);
33
34void arch_cpu_idle(void)
35{
36 raw_local_irq_enable();
37}
38
39/*
40 * The development boards have no way to pull a board reset. Just jump to the
41 * cpu reset address and let the boot loader or the code in head.S take care of
42 * resetting peripherals.
43 */
44void machine_restart(char *__unused)
45{
46 pr_notice("Machine restart (%08x)...\n", cpuinfo.reset_addr);
47 local_irq_disable();
48 __asm__ __volatile__ (
49 "jmp %0\n\t"
50 :
51 : "r" (cpuinfo.reset_addr)
52 : "r4");
53}
54
55void machine_halt(void)
56{
57 pr_notice("Machine halt...\n");
58 local_irq_disable();
59 for (;;)
60 ;
61}
62
63/*
64 * There is no way to power off the development boards. So just spin for now. If
65 * we ever have a way of resetting a board using a GPIO we should add that here.
66 */
67void machine_power_off(void)
68{
69 pr_notice("Machine power off...\n");
70 local_irq_disable();
71 for (;;)
72 ;
73}
74
75void show_regs(struct pt_regs *regs)
76{
77 pr_notice("\n");
78 show_regs_print_info(KERN_DEFAULT);
79
80 pr_notice("r1: %08lx r2: %08lx r3: %08lx r4: %08lx\n",
81 regs->r1, regs->r2, regs->r3, regs->r4);
82
83 pr_notice("r5: %08lx r6: %08lx r7: %08lx r8: %08lx\n",
84 regs->r5, regs->r6, regs->r7, regs->r8);
85
86 pr_notice("r9: %08lx r10: %08lx r11: %08lx r12: %08lx\n",
87 regs->r9, regs->r10, regs->r11, regs->r12);
88
89 pr_notice("r13: %08lx r14: %08lx r15: %08lx\n",
90 regs->r13, regs->r14, regs->r15);
91
92 pr_notice("ra: %08lx fp: %08lx sp: %08lx gp: %08lx\n",
93 regs->ra, regs->fp, regs->sp, regs->gp);
94
95 pr_notice("ea: %08lx estatus: %08lx\n",
96 regs->ea, regs->estatus);
97}
98
99void flush_thread(void)
100{
101}
102
103int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
104{
105 unsigned long clone_flags = args->flags;
106 unsigned long usp = args->stack;
107 unsigned long tls = args->tls;
108 struct pt_regs *childregs = task_pt_regs(p);
109 struct pt_regs *regs;
110 struct switch_stack *stack;
111 struct switch_stack *childstack =
112 ((struct switch_stack *)childregs) - 1;
113
114 if (unlikely(args->fn)) {
115 memset(childstack, 0,
116 sizeof(struct switch_stack) + sizeof(struct pt_regs));
117
118 childstack->r16 = (unsigned long) args->fn;
119 childstack->r17 = (unsigned long) args->fn_arg;
120 childstack->ra = (unsigned long) ret_from_kernel_thread;
121 childregs->estatus = STATUS_PIE;
122 childregs->sp = (unsigned long) childstack;
123
124 p->thread.ksp = (unsigned long) childstack;
125 p->thread.kregs = childregs;
126 return 0;
127 }
128
129 regs = current_pt_regs();
130 *childregs = *regs;
131 childregs->r2 = 0; /* Set the return value for the child. */
132 childregs->r7 = 0;
133
134 stack = ((struct switch_stack *) regs) - 1;
135 *childstack = *stack;
136 childstack->ra = (unsigned long)ret_from_fork;
137 p->thread.kregs = childregs;
138 p->thread.ksp = (unsigned long) childstack;
139
140 if (usp)
141 childregs->sp = usp;
142
143 /* Initialize tls register. */
144 if (clone_flags & CLONE_SETTLS)
145 childstack->r23 = tls;
146
147 return 0;
148}
149
150/*
151 * Generic dumping code. Used for panic and debug.
152 */
153void dump(struct pt_regs *fp)
154{
155 unsigned long *sp;
156 unsigned char *tp;
157 int i;
158
159 pr_emerg("\nCURRENT PROCESS:\n\n");
160 pr_emerg("COMM=%s PID=%d\n", current->comm, current->pid);
161
162 if (current->mm) {
163 pr_emerg("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
164 (int) current->mm->start_code,
165 (int) current->mm->end_code,
166 (int) current->mm->start_data,
167 (int) current->mm->end_data,
168 (int) current->mm->end_data,
169 (int) current->mm->brk);
170 pr_emerg("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
171 (int) current->mm->start_stack,
172 (int)(((unsigned long) current) + THREAD_SIZE));
173 }
174
175 pr_emerg("PC: %08lx\n", fp->ea);
176 pr_emerg("SR: %08lx SP: %08lx\n",
177 (long) fp->estatus, (long) fp);
178
179 pr_emerg("r1: %08lx r2: %08lx r3: %08lx\n",
180 fp->r1, fp->r2, fp->r3);
181
182 pr_emerg("r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n",
183 fp->r4, fp->r5, fp->r6, fp->r7);
184 pr_emerg("r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n",
185 fp->r8, fp->r9, fp->r10, fp->r11);
186 pr_emerg("r12: %08lx r13: %08lx r14: %08lx r15: %08lx\n",
187 fp->r12, fp->r13, fp->r14, fp->r15);
188 pr_emerg("or2: %08lx ra: %08lx fp: %08lx sp: %08lx\n",
189 fp->orig_r2, fp->ra, fp->fp, fp->sp);
190 pr_emerg("\nUSP: %08x TRAPFRAME: %08x\n",
191 (unsigned int) fp->sp, (unsigned int) fp);
192
193 pr_emerg("\nCODE:");
194 tp = ((unsigned char *) fp->ea) - 0x20;
195 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
196 if ((i % 0x10) == 0)
197 pr_emerg("\n%08x: ", (int) (tp + i));
198 pr_emerg("%08x ", (int) *sp++);
199 }
200 pr_emerg("\n");
201
202 pr_emerg("\nKERNEL STACK:");
203 tp = ((unsigned char *) fp) - 0x40;
204 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
205 if ((i % 0x10) == 0)
206 pr_emerg("\n%08x: ", (int) (tp + i));
207 pr_emerg("%08x ", (int) *sp++);
208 }
209 pr_emerg("\n");
210 pr_emerg("\n");
211
212 pr_emerg("\nUSER STACK:");
213 tp = (unsigned char *) (fp->sp - 0x10);
214 for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
215 if ((i % 0x10) == 0)
216 pr_emerg("\n%08x: ", (int) (tp + i));
217 pr_emerg("%08x ", (int) *sp++);
218 }
219 pr_emerg("\n\n");
220}
221
222unsigned long __get_wchan(struct task_struct *p)
223{
224 unsigned long fp, pc;
225 unsigned long stack_page;
226 int count = 0;
227
228 stack_page = (unsigned long)p;
229 fp = ((struct switch_stack *)p->thread.ksp)->fp; /* ;dgt2 */
230 do {
231 if (fp < stack_page+sizeof(struct task_struct) ||
232 fp >= 8184+stack_page) /* ;dgt2;tmp */
233 return 0;
234 pc = ((unsigned long *)fp)[1];
235 if (!in_sched_functions(pc))
236 return pc;
237 fp = *(unsigned long *) fp;
238 } while (count++ < 16); /* ;dgt2;tmp */
239 return 0;
240}
241
242/*
243 * Do necessary setup to start up a newly executed thread.
244 * Will startup in user mode (status_extension = 0).
245 */
246void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
247{
248 memset((void *) regs, 0, sizeof(struct pt_regs));
249 regs->estatus = ESTATUS_EPIE | ESTATUS_EU;
250 regs->ea = pc;
251 regs->sp = sp;
252}
253
254asmlinkage int nios2_clone(unsigned long clone_flags, unsigned long newsp,
255 int __user *parent_tidptr, int __user *child_tidptr,
256 unsigned long tls)
257{
258 struct kernel_clone_args args = {
259 .flags = (lower_32_bits(clone_flags) & ~CSIGNAL),
260 .pidfd = parent_tidptr,
261 .child_tid = child_tidptr,
262 .parent_tid = parent_tidptr,
263 .exit_signal = (lower_32_bits(clone_flags) & CSIGNAL),
264 .stack = newsp,
265 .tls = tls,
266 };
267
268 return kernel_clone(&args);
269}