[mirror_ubuntu-bionic-kernel.git] / arch / nios2 / kernel / process.c

/*
 * Architecture-dependent parts of process handling.
 *
 * Copyright (C) 2013 Altera Corporation
 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
 * Copyright (C) 2009 Wind River Systems Inc
 *   Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
 * Copyright (C) 2004 Microtronix Datacom Ltd
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/export.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include <linux/uaccess.h>

#include <asm/unistd.h>
#include <asm/traps.h>
#include <asm/cpuinfo.h>

asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);

void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);

void arch_cpu_idle(void)
{
	local_irq_enable();
}

/*
 * The development boards have no way to pull a board reset. Just jump to the
 * cpu reset address and let the boot loader or the code in head.S take care of
 * resetting peripherals.
 */
void machine_restart(char *__unused)
{
	pr_notice("Machine restart (%08x)...\n", cpuinfo.reset_addr);
	local_irq_disable();
	__asm__ __volatile__ (
	"jmp	%0\n\t"
	:
	: "r" (cpuinfo.reset_addr)
	: "r4");
}

void machine_halt(void)
{
	pr_notice("Machine halt...\n");
	local_irq_disable();
	for (;;)
		;
}

/*
 * There is no way to power off the development boards. So just spin for now. If
 * we ever have a way of resetting a board using a GPIO we should add that here.
 */
void machine_power_off(void)
{
	pr_notice("Machine power off...\n");
	local_irq_disable();
	for (;;)
		;
}

void show_regs(struct pt_regs *regs)
{
	pr_notice("\n");
	show_regs_print_info(KERN_DEFAULT);

	pr_notice("r1: %08lx r2: %08lx r3: %08lx r4: %08lx\n",
		regs->r1,  regs->r2,  regs->r3,  regs->r4);

	pr_notice("r5: %08lx r6: %08lx r7: %08lx r8: %08lx\n",
		regs->r5,  regs->r6,  regs->r7,  regs->r8);

	pr_notice("r9: %08lx r10: %08lx r11: %08lx r12: %08lx\n",
		regs->r9,  regs->r10, regs->r11, regs->r12);

	pr_notice("r13: %08lx r14: %08lx r15: %08lx\n",
		regs->r13, regs->r14, regs->r15);

	pr_notice("ra: %08lx fp:  %08lx sp: %08lx gp: %08lx\n",
		regs->ra,  regs->fp,  regs->sp,  regs->gp);

	pr_notice("ea: %08lx estatus: %08lx\n",
		regs->ea,  regs->estatus);
}

void flush_thread(void)
{
}

int copy_thread(unsigned long clone_flags,
		unsigned long usp, unsigned long arg, struct task_struct *p)
{
	struct pt_regs *childregs = task_pt_regs(p);
	struct pt_regs *regs;
	struct switch_stack *stack;
	struct switch_stack *childstack =
		((struct switch_stack *)childregs) - 1;

	if (unlikely(p->flags & PF_KTHREAD)) {
		memset(childstack, 0,
			sizeof(struct switch_stack) + sizeof(struct pt_regs));

		childstack->r16 = usp;		/* fn */
		childstack->r17 = arg;
		childstack->ra = (unsigned long) ret_from_kernel_thread;
		childregs->estatus = STATUS_PIE;
		childregs->sp = (unsigned long) childstack;

		p->thread.ksp = (unsigned long) childstack;
		p->thread.kregs = childregs;
		return 0;
	}

	regs = current_pt_regs();
	*childregs = *regs;
	childregs->r2 = 0;	/* Set the return value for the child. */
	childregs->r7 = 0;

	stack = ((struct switch_stack *) regs) - 1;
	*childstack = *stack;
	childstack->ra = (unsigned long)ret_from_fork;
	p->thread.kregs = childregs;
	p->thread.ksp = (unsigned long) childstack;

	if (usp)
		childregs->sp = usp;

	/* Initialize tls register. */
	if (clone_flags & CLONE_SETTLS)
		childstack->r23 = regs->r8;

	return 0;
}

/*
 *	Generic dumping code. Used for panic and debug.
 */
void dump(struct pt_regs *fp)
{
	unsigned long	*sp;
	unsigned char	*tp;
	int		i;

	pr_emerg("\nCURRENT PROCESS:\n\n");
	pr_emerg("COMM=%s PID=%d\n", current->comm, current->pid);

	if (current->mm) {
		pr_emerg("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
			(int) current->mm->start_code,
			(int) current->mm->end_code,
			(int) current->mm->start_data,
			(int) current->mm->end_data,
			(int) current->mm->end_data,
			(int) current->mm->brk);
		pr_emerg("USER-STACK=%08x  KERNEL-STACK=%08x\n\n",
			(int) current->mm->start_stack,
			(int)(((unsigned long) current) + THREAD_SIZE));
	}

	pr_emerg("PC: %08lx\n", fp->ea);
	pr_emerg("SR: %08lx    SP: %08lx\n",
		(long) fp->estatus, (long) fp);

	pr_emerg("r1: %08lx    r2: %08lx    r3: %08lx\n",
		fp->r1, fp->r2, fp->r3);

	pr_emerg("r4: %08lx    r5: %08lx    r6: %08lx    r7: %08lx\n",
		fp->r4, fp->r5, fp->r6, fp->r7);
	pr_emerg("r8: %08lx    r9: %08lx    r10: %08lx    r11: %08lx\n",
		fp->r8, fp->r9, fp->r10, fp->r11);
	pr_emerg("r12: %08lx  r13: %08lx    r14: %08lx    r15: %08lx\n",
		fp->r12, fp->r13, fp->r14, fp->r15);
	pr_emerg("or2: %08lx   ra: %08lx     fp: %08lx    sp: %08lx\n",
		fp->orig_r2, fp->ra, fp->fp, fp->sp);
	pr_emerg("\nUSP: %08x   TRAPFRAME: %08x\n",
		(unsigned int) fp->sp, (unsigned int) fp);

	pr_emerg("\nCODE:");
	tp = ((unsigned char *) fp->ea) - 0x20;
	for (sp = (unsigned long *) tp, i = 0; (i < 0x40);  i += 4) {
		if ((i % 0x10) == 0)
			pr_emerg("\n%08x: ", (int) (tp + i));
		pr_emerg("%08x ", (int) *sp++);
	}
	pr_emerg("\n");

	pr_emerg("\nKERNEL STACK:");
	tp = ((unsigned char *) fp) - 0x40;
	for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
		if ((i % 0x10) == 0)
			pr_emerg("\n%08x: ", (int) (tp + i));
		pr_emerg("%08x ", (int) *sp++);
	}
	pr_emerg("\n");
	pr_emerg("\n");

	pr_emerg("\nUSER STACK:");
	tp = (unsigned char *) (fp->sp - 0x10);
	for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
		if ((i % 0x10) == 0)
			pr_emerg("\n%08x: ", (int) (tp + i));
		pr_emerg("%08x ", (int) *sp++);
	}
	pr_emerg("\n\n");
}

unsigned long get_wchan(struct task_struct *p)
{
	unsigned long fp, pc;
	unsigned long stack_page;
	int count = 0;

	if (!p || p == current || p->state == TASK_RUNNING)
		return 0;

	stack_page = (unsigned long)p;
	fp = ((struct switch_stack *)p->thread.ksp)->fp;	/* ;dgt2 */
	do {
		if (fp < stack_page+sizeof(struct task_struct) ||
			fp >= 8184+stack_page)	/* ;dgt2;tmp */
			return 0;
		pc = ((unsigned long *)fp)[1];
		if (!in_sched_functions(pc))
			return pc;
		fp = *(unsigned long *) fp;
	} while (count++ < 16);		/* ;dgt2;tmp */
	return 0;
}

/*
 * Do necessary setup to start up a newly executed thread.
 * Will startup in user mode (status_extension = 0).
 */
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
{
	memset((void *) regs, 0, sizeof(struct pt_regs));
	regs->estatus = ESTATUS_EPIE | ESTATUS_EU;
	regs->ea = pc;
	regs->sp = sp;
}

#include <linux/elfcore.h>

/* Fill in the FPU structure for a core dump. */
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
{
	return 0; /* Nios2 has no FPU and thus no FPU registers */
}
Commit	Line	Data
71995e4d LFT	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
	24	asmlinkage void ret_from_fork(void);
	25	asmlinkage void ret_from_kernel_thread(void);
	26
	27	void (*pm_power_off)(void) = NULL;
	28	EXPORT_SYMBOL(pm_power_off);
	29
	30	void 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	*/
	40	void 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
	51	void 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	*/
	63	void machine_power_off(void)
	64	{
65	pr_notice("Machine power off...\n");
66	local_irq_disable();
67	for (;;)
68	;
69	}
70
71	void 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
95	void flush_thread(void)
96	{
71995e4d LFT	97	}
	98
	99	int 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	*/
	147	void 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
216	unsigned 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	*/
243	void 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. */
254	int dump_fpu(struct pt_regs regs, elf_fpregset_t r)
255	{
256	return 0; /* Nios2 has no FPU and thus no FPU registers */
257	}