[mirror_ubuntu-zesty-kernel.git] / arch / frv / kernel / process.c

/* process.c: FRV specific parts of process handling
 *
 * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 * - Derived from arch/m68k/kernel/process.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/elf.h>
#include <linux/reboot.h>
#include <linux/interrupt.h>
#include <linux/pagemap.h>
#include <linux/rcupdate.h>

#include <asm/asm-offsets.h>
#include <linux/uaccess.h>
#include <asm/setup.h>
#include <asm/pgtable.h>
#include <asm/tlb.h>
#include <asm/gdb-stub.h>
#include <asm/mb-regs.h>

#include "local.h"

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

#include <asm/pgalloc.h>

void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);

static void core_sleep_idle(void)
{
#ifdef LED_DEBUG_SLEEP
	/* Show that we're sleeping... */
	__set_LEDS(0x55aa);
#endif
	frv_cpu_core_sleep();
#ifdef LED_DEBUG_SLEEP
	/* ... and that we woke up */
	__set_LEDS(0);
#endif
	mb();
}

void arch_cpu_idle(void)
{
	if (!frv_dma_inprogress)
		core_sleep_idle();
	else
		local_irq_enable();
}

void machine_restart(char * __unused)
{
	unsigned long reset_addr;
#ifdef CONFIG_GDBSTUB
	gdbstub_exit(0);
#endif

	if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551)
		reset_addr = 0xfefff500;
	else
		reset_addr = 0xfeff0500;

	/* Software reset. */
	asm volatile("      dcef @(gr0,gr0),1 ! membar !"
		     "      sti     %1,@(%0,0) !"
		     "      nop ! nop ! nop ! nop ! nop ! "
		     "      nop ! nop ! nop ! nop ! nop ! "
		     "      nop ! nop ! nop ! nop ! nop ! "
		     "      nop ! nop ! nop ! nop ! nop ! "
		     : : "r" (reset_addr), "r" (1) );

	for (;;)
		;
}

void machine_halt(void)
{
#ifdef CONFIG_GDBSTUB
	gdbstub_exit(0);
#endif

	for (;;);
}

void machine_power_off(void)
{
#ifdef CONFIG_GDBSTUB
	gdbstub_exit(0);
#endif

	for (;;);
}

void flush_thread(void)
{
	/* nothing */
}

inline unsigned long user_stack(const struct pt_regs *regs)
{
	while (regs->next_frame)
		regs = regs->next_frame;
	return user_mode(regs) ? regs->sp : 0;
}

/*
 * set up the kernel stack and exception frames for a new process
 */
int copy_thread(unsigned long clone_flags,
		unsigned long usp, unsigned long arg,
		struct task_struct *p)
{
	struct pt_regs *childregs;

	childregs = (struct pt_regs *)
		(task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);

	/* set up the userspace frame (the only place that the USP is stored) */
	*childregs = *current_pt_regs();

	p->thread.frame	 = childregs;
	p->thread.curr	 = p;
	p->thread.sp	 = (unsigned long) childregs;
	p->thread.fp	 = 0;
	p->thread.lr	 = 0;
	p->thread.frame0 = childregs;

	if (unlikely(p->flags & PF_KTHREAD)) {
		childregs->gr9 = usp; /* function */
		childregs->gr8 = arg;
		p->thread.pc = (unsigned long) ret_from_kernel_thread;
		save_user_regs(p->thread.user);
		return 0;
	}
	if (usp)
		childregs->sp = usp;
	childregs->next_frame	= NULL;

	p->thread.pc = (unsigned long) ret_from_fork;

	/* the new TLS pointer is passed in as arg #5 to sys_clone() */
	if (clone_flags & CLONE_SETTLS)
		childregs->gr29 = childregs->gr12;

	save_user_regs(p->thread.user);

	return 0;
} /* end copy_thread() */

unsigned long get_wchan(struct task_struct *p)
{
	struct pt_regs *regs0;
	unsigned long fp, pc;
	unsigned long stack_limit;
	int count = 0;
	if (!p || p == current || p->state == TASK_RUNNING)
		return 0;

	stack_limit = (unsigned long) (p + 1);
	fp = p->thread.fp;
	regs0 = p->thread.frame0;

	do {
		if (fp < stack_limit || fp >= (unsigned long) regs0 || fp & 3)
			return 0;

		pc = ((unsigned long *) fp)[2];

		/* FIXME: This depends on the order of these functions. */
		if (!in_sched_functions(pc))
			return pc;

		fp = *(unsigned long *) fp;
	} while (count++ < 16);

	return 0;
}

unsigned long thread_saved_pc(struct task_struct *tsk)
{
	/* Check whether the thread is blocked in resume() */
	if (in_sched_functions(tsk->thread.pc))
		return ((unsigned long *)tsk->thread.fp)[2];
	else
		return tsk->thread.pc;
}

int elf_check_arch(const struct elf32_hdr *hdr)
{
	unsigned long hsr0 = __get_HSR(0);
	unsigned long psr = __get_PSR();

	if (hdr->e_machine != EM_FRV)
		return 0;

	switch (hdr->e_flags & EF_FRV_GPR_MASK) {
	case EF_FRV_GPR64:
		if ((hsr0 & HSR0_GRN) == HSR0_GRN_32)
			return 0;
	case EF_FRV_GPR32:
	case 0:
		break;
	default:
		return 0;
	}

	switch (hdr->e_flags & EF_FRV_FPR_MASK) {
	case EF_FRV_FPR64:
		if ((hsr0 & HSR0_FRN) == HSR0_FRN_32)
			return 0;
	case EF_FRV_FPR32:
	case EF_FRV_FPR_NONE:
	case 0:
		break;
	default:
		return 0;
	}

	if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD)
		if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
		    PSR_IMPLE(psr) != PSR_IMPLE_FR451)
			return 0;

	switch (hdr->e_flags & EF_FRV_CPU_MASK) {
	case EF_FRV_CPU_GENERIC:
		break;
	case EF_FRV_CPU_FR300:
	case EF_FRV_CPU_SIMPLE:
	case EF_FRV_CPU_TOMCAT:
	default:
		return 0;
	case EF_FRV_CPU_FR400:
		if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 &&
		    PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
		    PSR_IMPLE(psr) != PSR_IMPLE_FR451 &&
		    PSR_IMPLE(psr) != PSR_IMPLE_FR551)
			return 0;
		break;
	case EF_FRV_CPU_FR450:
		if (PSR_IMPLE(psr) != PSR_IMPLE_FR451)
			return 0;
		break;
	case EF_FRV_CPU_FR500:
		if (PSR_IMPLE(psr) != PSR_IMPLE_FR501)
			return 0;
		break;
	case EF_FRV_CPU_FR550:
		if (PSR_IMPLE(psr) != PSR_IMPLE_FR551)
			return 0;
		break;
	}

	return 1;
}

int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
{
	memcpy(fpregs,
	       &current->thread.user->f,
	       sizeof(current->thread.user->f));
	return 1;
}
Commit	Line	Data
1da177e4 LT	1	/* process.c: FRV specific parts of process handling
	2	*
	3	* Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	* - Derived from arch/m68k/kernel/process.c
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*/
	12
9dec17eb	13	#include <linux/module.h>
1da177e4 LT	14	#include <linux/errno.h>
	15	#include <linux/sched.h>
	16	#include <linux/kernel.h>
	17	#include <linux/mm.h>
	18	#include <linux/smp.h>
1da177e4 LT	19	#include <linux/stddef.h>
	20	#include <linux/unistd.h>
	21	#include <linux/ptrace.h>
	22	#include <linux/slab.h>
	23	#include <linux/user.h>
	24	#include <linux/elf.h>
	25	#include <linux/reboot.h>
	26	#include <linux/interrupt.h>
8defab33	27	#include <linux/pagemap.h>
41d8fe5b	28	#include <linux/rcupdate.h>
1da177e4	29
84e8cd6d	30	#include <asm/asm-offsets.h>
7c0f6ba6	31	#include <linux/uaccess.h>
1da177e4 LT	32	#include <asm/setup.h>
1da177e4 LT	33	#include <asm/pgtable.h>
8defab33	34	#include <asm/tlb.h>
1da177e4 LT	35	#include <asm/gdb-stub.h>
	36	#include <asm/mb-regs.h>
	37
	38	#include "local.h"
	39
	40	asmlinkage void ret_from_fork(void);
02ce496f	41	asmlinkage void ret_from_kernel_thread(void);
1da177e4 LT	42
	43	#include <asm/pgalloc.h>
	44
9dec17eb DH	45	void (*pm_power_off)(void);
	46	EXPORT_SYMBOL(pm_power_off);
	47
1da177e4 LT	48	static void core_sleep_idle(void)
	49	{
	50	#ifdef LED_DEBUG_SLEEP
	51	/* Show that we're sleeping... */
	52	__set_LEDS(0x55aa);
	53	#endif
	54	frv_cpu_core_sleep();
	55	#ifdef LED_DEBUG_SLEEP
	56	/* ... and that we woke up */
	57	__set_LEDS(0);
	58	#endif
	59	mb();
	60	}
	61
ccf8e78f	62	void arch_cpu_idle(void)
1da177e4	63	{
ccf8e78f TG	64	if (!frv_dma_inprogress)
	65	core_sleep_idle();
	66	else
	67	local_irq_enable();
1da177e4 LT	68	}
	69
	70	void machine_restart(char * __unused)
	71	{
	72	unsigned long reset_addr;
	73	#ifdef CONFIG_GDBSTUB
	74	gdbstub_exit(0);
	75	#endif
	76
	77	if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551)
	78	reset_addr = 0xfefff500;
	79	else
	80	reset_addr = 0xfeff0500;
	81
	82	/* Software reset. */
	83	asm volatile(" dcef @(gr0,gr0),1 ! membar !"
	84	" sti %1,@(%0,0) !"
	85	" nop ! nop ! nop ! nop ! nop ! "
	86	" nop ! nop ! nop ! nop ! nop ! "
	87	" nop ! nop ! nop ! nop ! nop ! "
	88	" nop ! nop ! nop ! nop ! nop ! "
	89	: : "r" (reset_addr), "r" (1) );
	90
	91	for (;;)
	92	;
	93	}
	94
	95	void machine_halt(void)
	96	{
	97	#ifdef CONFIG_GDBSTUB
	98	gdbstub_exit(0);
	99	#endif
	100
	101	for (;;);
	102	}
	103
	104	void machine_power_off(void)
	105	{
	106	#ifdef CONFIG_GDBSTUB
	107	gdbstub_exit(0);
	108	#endif
	109
	110	for (;;);
	111	}
	112
	113	void flush_thread(void)
	114	{
adc400f6	115	/* nothing */
1da177e4 LT	116	}
	117
	118	inline unsigned long user_stack(const struct pt_regs *regs)
	119	{
	120	while (regs->next_frame)
	121	regs = regs->next_frame;
	122	return user_mode(regs) ? regs->sp : 0;
	123	}
	124
1da177e4 LT	125	/*
	126	* set up the kernel stack and exception frames for a new process
	127	*/
6f2c55b8	128	int copy_thread(unsigned long clone_flags,
49ed3398	129	unsigned long usp, unsigned long arg,
afa86fc4	130	struct task_struct *p)
1da177e4	131	{
02ce496f	132	struct pt_regs *childregs;
1da177e4	133
02ce496f	134	childregs = (struct pt_regs *)
84e8cd6d	135	(task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
1da177e4	136
e7aa51b2	137	/* set up the userspace frame (the only place that the USP is stored) */
b9763ce3	138	childregs = current_pt_regs();
1da177e4 LT	139
	140	p->thread.frame = childregs;
	141	p->thread.curr = p;
	142	p->thread.sp = (unsigned long) childregs;
	143	p->thread.fp = 0;
	144	p->thread.lr = 0;
02ce496f	145	p->thread.frame0 = childregs;
1da177e4	146
b9763ce3	147	if (unlikely(p->flags & PF_KTHREAD)) {
49ed3398 AV	148	childregs->gr9 = usp; /* function */
49ed3398 AV	149	childregs->gr8 = arg;
49ed3398 AV	150	p->thread.pc = (unsigned long) ret_from_kernel_thread;
	151	save_user_regs(p->thread.user);
	152	return 0;
	153	}
b9763ce3 AV	154	if (usp)
b9763ce3 AV	155	childregs->sp = usp;
49ed3398 AV	156	childregs->next_frame = NULL;
	157
	158	p->thread.pc = (unsigned long) ret_from_fork;
1da177e4 LT	159
	160	/* the new TLS pointer is passed in as arg #5 to sys_clone() */
	161	if (clone_flags & CLONE_SETTLS)
	162	childregs->gr29 = childregs->gr12;
	163
	164	save_user_regs(p->thread.user);
	165
	166	return 0;
	167	} /* end copy_thread() */
	168
1da177e4 LT	169	unsigned long get_wchan(struct task_struct *p)
	170	{
	171	struct pt_regs *regs0;
	172	unsigned long fp, pc;
	173	unsigned long stack_limit;
	174	int count = 0;
	175	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	176	return 0;
	177
	178	stack_limit = (unsigned long) (p + 1);
	179	fp = p->thread.fp;
	180	regs0 = p->thread.frame0;
	181
	182	do {
	183	if (fp < stack_limit \|\| fp >= (unsigned long) regs0 \|\| fp & 3)
	184	return 0;
	185
	186	pc = ((unsigned long *) fp)[2];
	187
	188	/* FIXME: This depends on the order of these functions. */
	189	if (!in_sched_functions(pc))
	190	return pc;
	191
	192	fp = (unsigned long ) fp;
	193	} while (count++ < 16);
	194
	195	return 0;
	196	}
	197
	198	unsigned long thread_saved_pc(struct task_struct *tsk)
	199	{
	200	/* Check whether the thread is blocked in resume() */
	201	if (in_sched_functions(tsk->thread.pc))
	202	return ((unsigned long *)tsk->thread.fp)[2];
	203	else
	204	return tsk->thread.pc;
	205	}
	206
	207	int elf_check_arch(const struct elf32_hdr *hdr)
	208	{
	209	unsigned long hsr0 = __get_HSR(0);
	210	unsigned long psr = __get_PSR();
	211
	212	if (hdr->e_machine != EM_FRV)
	213	return 0;
	214
	215	switch (hdr->e_flags & EF_FRV_GPR_MASK) {
	216	case EF_FRV_GPR64:
	217	if ((hsr0 & HSR0_GRN) == HSR0_GRN_32)
	218	return 0;
	219	case EF_FRV_GPR32:
	220	case 0:
	221	break;
	222	default:
	223	return 0;
	224	}
	225
	226	switch (hdr->e_flags & EF_FRV_FPR_MASK) {
	227	case EF_FRV_FPR64:
	228	if ((hsr0 & HSR0_FRN) == HSR0_FRN_32)
	229	return 0;
	230	case EF_FRV_FPR32:
	231	case EF_FRV_FPR_NONE:
	232	case 0:
233	break;
234	default:
235	return 0;
236	}
237
238	if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD)
239	if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
240	PSR_IMPLE(psr) != PSR_IMPLE_FR451)
241	return 0;
242
243	switch (hdr->e_flags & EF_FRV_CPU_MASK) {
244	case EF_FRV_CPU_GENERIC:
245	break;
246	case EF_FRV_CPU_FR300:
247	case EF_FRV_CPU_SIMPLE:
248	case EF_FRV_CPU_TOMCAT:
249	default:
250	return 0;
251	case EF_FRV_CPU_FR400:
252	if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 &&
253	PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
254	PSR_IMPLE(psr) != PSR_IMPLE_FR451 &&
255	PSR_IMPLE(psr) != PSR_IMPLE_FR551)
256	return 0;
257	break;
258	case EF_FRV_CPU_FR450:
259	if (PSR_IMPLE(psr) != PSR_IMPLE_FR451)
260	return 0;
261	break;
262	case EF_FRV_CPU_FR500:
263	if (PSR_IMPLE(psr) != PSR_IMPLE_FR501)
264	return 0;
265	break;
266	case EF_FRV_CPU_FR550:
267	if (PSR_IMPLE(psr) != PSR_IMPLE_FR551)
268	return 0;
269	break;
270	}
271
272	return 1;
273	}
6d8c4e3b DH	274
	275	int dump_fpu(struct pt_regs regs, elf_fpregset_t fpregs)
	276	{
	277	memcpy(fpregs,
	278	&current->thread.user->f,
	279	sizeof(current->thread.user->f));
	280	return 1;
	281	}