[linux-2.6-block.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/sched/debug.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>
1da177e4 LT	15	#include <linux/sched.h>
b17b0153	16	#include <linux/sched/debug.h>
1da177e4 LT	17	#include <linux/kernel.h>
	18	#include <linux/mm.h>
	19	#include <linux/smp.h>
1da177e4 LT	20	#include <linux/stddef.h>
	21	#include <linux/unistd.h>
	22	#include <linux/ptrace.h>
	23	#include <linux/slab.h>
	24	#include <linux/user.h>
	25	#include <linux/elf.h>
	26	#include <linux/reboot.h>
	27	#include <linux/interrupt.h>
8defab33	28	#include <linux/pagemap.h>
41d8fe5b	29	#include <linux/rcupdate.h>
1da177e4	30
84e8cd6d	31	#include <asm/asm-offsets.h>
7c0f6ba6	32	#include <linux/uaccess.h>
1da177e4 LT	33	#include <asm/setup.h>
1da177e4 LT	34	#include <asm/pgtable.h>
8defab33	35	#include <asm/tlb.h>
1da177e4 LT	36	#include <asm/gdb-stub.h>
	37	#include <asm/mb-regs.h>
	38
	39	#include "local.h"
	40
	41	asmlinkage void ret_from_fork(void);
02ce496f	42	asmlinkage void ret_from_kernel_thread(void);
1da177e4 LT	43
	44	#include <asm/pgalloc.h>
	45
9dec17eb DH	46	void (*pm_power_off)(void);
	47	EXPORT_SYMBOL(pm_power_off);
	48
1da177e4 LT	49	static void core_sleep_idle(void)
	50	{
	51	#ifdef LED_DEBUG_SLEEP
	52	/* Show that we're sleeping... */
	53	__set_LEDS(0x55aa);
	54	#endif
	55	frv_cpu_core_sleep();
	56	#ifdef LED_DEBUG_SLEEP
	57	/* ... and that we woke up */
	58	__set_LEDS(0);
	59	#endif
	60	mb();
	61	}
	62
ccf8e78f	63	void arch_cpu_idle(void)
1da177e4	64	{
ccf8e78f TG	65	if (!frv_dma_inprogress)
	66	core_sleep_idle();
	67	else
	68	local_irq_enable();
1da177e4 LT	69	}
	70
	71	void machine_restart(char * __unused)
	72	{
	73	unsigned long reset_addr;
	74	#ifdef CONFIG_GDBSTUB
	75	gdbstub_exit(0);
	76	#endif
	77
	78	if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551)
	79	reset_addr = 0xfefff500;
	80	else
	81	reset_addr = 0xfeff0500;
	82
	83	/* Software reset. */
	84	asm volatile(" dcef @(gr0,gr0),1 ! membar !"
	85	" sti %1,@(%0,0) !"
	86	" nop ! nop ! nop ! nop ! nop ! "
	87	" nop ! nop ! nop ! nop ! nop ! "
	88	" nop ! nop ! nop ! nop ! nop ! "
	89	" nop ! nop ! nop ! nop ! nop ! "
	90	: : "r" (reset_addr), "r" (1) );
	91
	92	for (;;)
	93	;
	94	}
	95
	96	void machine_halt(void)
	97	{
	98	#ifdef CONFIG_GDBSTUB
	99	gdbstub_exit(0);
	100	#endif
	101
	102	for (;;);
	103	}
	104
	105	void machine_power_off(void)
	106	{
	107	#ifdef CONFIG_GDBSTUB
	108	gdbstub_exit(0);
	109	#endif
	110
	111	for (;;);
	112	}
	113
	114	void flush_thread(void)
	115	{
adc400f6	116	/* nothing */
1da177e4 LT	117	}
	118
	119	inline unsigned long user_stack(const struct pt_regs *regs)
	120	{
	121	while (regs->next_frame)
	122	regs = regs->next_frame;
	123	return user_mode(regs) ? regs->sp : 0;
	124	}
	125
1da177e4 LT	126	/*
	127	* set up the kernel stack and exception frames for a new process
	128	*/
6f2c55b8	129	int copy_thread(unsigned long clone_flags,
49ed3398	130	unsigned long usp, unsigned long arg,
afa86fc4	131	struct task_struct *p)
1da177e4	132	{
02ce496f	133	struct pt_regs *childregs;
1da177e4	134
02ce496f	135	childregs = (struct pt_regs *)
84e8cd6d	136	(task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
1da177e4	137
e7aa51b2	138	/* set up the userspace frame (the only place that the USP is stored) */
b9763ce3	139	childregs = current_pt_regs();
1da177e4 LT	140
	141	p->thread.frame = childregs;
	142	p->thread.curr = p;
	143	p->thread.sp = (unsigned long) childregs;
	144	p->thread.fp = 0;
	145	p->thread.lr = 0;
02ce496f	146	p->thread.frame0 = childregs;
1da177e4	147
b9763ce3	148	if (unlikely(p->flags & PF_KTHREAD)) {
49ed3398 AV	149	childregs->gr9 = usp; /* function */
49ed3398 AV	150	childregs->gr8 = arg;
49ed3398 AV	151	p->thread.pc = (unsigned long) ret_from_kernel_thread;
	152	save_user_regs(p->thread.user);
	153	return 0;
	154	}
b9763ce3 AV	155	if (usp)
b9763ce3 AV	156	childregs->sp = usp;
49ed3398 AV	157	childregs->next_frame = NULL;
	158
	159	p->thread.pc = (unsigned long) ret_from_fork;
1da177e4 LT	160
	161	/* the new TLS pointer is passed in as arg #5 to sys_clone() */
	162	if (clone_flags & CLONE_SETTLS)
	163	childregs->gr29 = childregs->gr12;
	164
	165	save_user_regs(p->thread.user);
	166
	167	return 0;
	168	} /* end copy_thread() */
	169
1da177e4 LT	170	unsigned long get_wchan(struct task_struct *p)
	171	{
	172	struct pt_regs *regs0;
	173	unsigned long fp, pc;
	174	unsigned long stack_limit;
	175	int count = 0;
	176	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	177	return 0;
	178
	179	stack_limit = (unsigned long) (p + 1);
	180	fp = p->thread.fp;
	181	regs0 = p->thread.frame0;
	182
	183	do {
	184	if (fp < stack_limit \|\| fp >= (unsigned long) regs0 \|\| fp & 3)
	185	return 0;
	186
	187	pc = ((unsigned long *) fp)[2];
	188
	189	/* FIXME: This depends on the order of these functions. */
	190	if (!in_sched_functions(pc))
	191	return pc;
	192
	193	fp = (unsigned long ) fp;
	194	} while (count++ < 16);
	195
	196	return 0;
	197	}
	198
	199	unsigned long thread_saved_pc(struct task_struct *tsk)
	200	{
	201	/* Check whether the thread is blocked in resume() */
	202	if (in_sched_functions(tsk->thread.pc))
	203	return ((unsigned long *)tsk->thread.fp)[2];
	204	else
	205	return tsk->thread.pc;
	206	}
	207
	208	int elf_check_arch(const struct elf32_hdr *hdr)
	209	{
	210	unsigned long hsr0 = __get_HSR(0);
	211	unsigned long psr = __get_PSR();
	212
	213	if (hdr->e_machine != EM_FRV)
	214	return 0;
	215
	216	switch (hdr->e_flags & EF_FRV_GPR_MASK) {
	217	case EF_FRV_GPR64:
	218	if ((hsr0 & HSR0_GRN) == HSR0_GRN_32)
	219	return 0;
	220	case EF_FRV_GPR32:
	221	case 0:
	222	break;
	223	default:
	224	return 0;
	225	}
	226
	227	switch (hdr->e_flags & EF_FRV_FPR_MASK) {
	228	case EF_FRV_FPR64:
	229	if ((hsr0 & HSR0_FRN) == HSR0_FRN_32)
	230	return 0;
	231	case EF_FRV_FPR32:
	232	case EF_FRV_FPR_NONE:
	233	case 0:
234	break;
235	default:
236	return 0;
237	}
238
239	if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD)
240	if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
241	PSR_IMPLE(psr) != PSR_IMPLE_FR451)
242	return 0;
243
244	switch (hdr->e_flags & EF_FRV_CPU_MASK) {
245	case EF_FRV_CPU_GENERIC:
246	break;
247	case EF_FRV_CPU_FR300:
248	case EF_FRV_CPU_SIMPLE:
249	case EF_FRV_CPU_TOMCAT:
250	default:
251	return 0;
252	case EF_FRV_CPU_FR400:
253	if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 &&
254	PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
255	PSR_IMPLE(psr) != PSR_IMPLE_FR451 &&
256	PSR_IMPLE(psr) != PSR_IMPLE_FR551)
257	return 0;
258	break;
259	case EF_FRV_CPU_FR450:
260	if (PSR_IMPLE(psr) != PSR_IMPLE_FR451)
261	return 0;
262	break;
263	case EF_FRV_CPU_FR500:
264	if (PSR_IMPLE(psr) != PSR_IMPLE_FR501)
265	return 0;
266	break;
267	case EF_FRV_CPU_FR550:
268	if (PSR_IMPLE(psr) != PSR_IMPLE_FR551)
269	return 0;
270	break;
271	}
272
273	return 1;
274	}
6d8c4e3b DH	275
	276	int dump_fpu(struct pt_regs regs, elf_fpregset_t fpregs)
	277	{
	278	memcpy(fpregs,
	279	&current->thread.user->f,
	280	sizeof(current->thread.user->f));
	281	return 1;
	282	}