[linux-2.6-block.git] / arch / blackfin / kernel / process.c

/*
 * File:         arch/blackfin/kernel/process.c
 * Based on:
 * Author:
 *
 * Created:
 * Description:  Blackfin architecture-dependent process handling.
 *
 * Modified:
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include <linux/smp_lock.h>
#include <linux/unistd.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/uaccess.h>

#include <asm/blackfin.h>
#include <asm/fixed_code.h>

#define	LED_ON	0
#define	LED_OFF	1

asmlinkage void ret_from_fork(void);

/* Points to the SDRAM backup memory for the stack that is currently in
 * L1 scratchpad memory.
 */
void *current_l1_stack_save;

/* The number of tasks currently using a L1 stack area.  The SRAM is
 * allocated/deallocated whenever this changes from/to zero.
 */
int nr_l1stack_tasks;

/* Start and length of the area in L1 scratchpad memory which we've allocated
 * for process stacks.
 */
void *l1_stack_base;
unsigned long l1_stack_len;

/*
 * Powermanagement idle function, if any..
 */
void (*pm_idle)(void) = NULL;
EXPORT_SYMBOL(pm_idle);

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

/*
 * We are using a different LED from the one used to indicate timer interrupt.
 */
#if defined(CONFIG_BFIN_IDLE_LED)
static inline void leds_switch(int flag)
{
	unsigned short tmp = 0;

	tmp = bfin_read_CONFIG_BFIN_IDLE_LED_PORT();
	SSYNC();

	if (flag == LED_ON)
		tmp &= ~CONFIG_BFIN_IDLE_LED_PIN;	/* light on */
	else
		tmp |= CONFIG_BFIN_IDLE_LED_PIN;	/* light off */

	bfin_write_CONFIG_BFIN_IDLE_LED_PORT(tmp);
	SSYNC();

}
#else
static inline void leds_switch(int flag)
{
}
#endif

/*
 * The idle loop on BFIN
 */
#ifdef CONFIG_IDLE_L1
void default_idle(void)__attribute__((l1_text));
void cpu_idle(void)__attribute__((l1_text));
#endif

void default_idle(void)
{
	while (!need_resched()) {
		leds_switch(LED_OFF);
		local_irq_disable();
		if (likely(!need_resched()))
			idle_with_irq_disabled();
		local_irq_enable();
		leds_switch(LED_ON);
	}
}

void (*idle)(void) = default_idle;

/*
 * The idle thread. There's no useful work to be
 * done, so just try to conserve power and have a
 * low exit latency (ie sit in a loop waiting for
 * somebody to say that they'd like to reschedule)
 */
void cpu_idle(void)
{
	/* endless idle loop with no priority at all */
	while (1) {
		idle();
		preempt_enable_no_resched();
		schedule();
		preempt_disable();
	}
}

void machine_restart(char *__unused)
{
#if defined(CONFIG_BLKFIN_CACHE)
	bfin_write_IMEM_CONTROL(0x01);
	SSYNC();
#endif
	bfin_reset();
	/* Dont do anything till the reset occurs */
	while (1) {
		SSYNC();
	}
}

void machine_halt(void)
{
	for (;;)
		asm volatile ("idle");
}

void machine_power_off(void)
{
	for (;;)
		asm volatile ("idle");
}

void show_regs(struct pt_regs *regs)
{
	printk(KERN_NOTICE "\n");
	printk(KERN_NOTICE
	       "PC: %08lu  Status: %04lu  SysStatus: %04lu  RETS: %08lu\n",
	       regs->pc, regs->astat, regs->seqstat, regs->rets);
	printk(KERN_NOTICE
	       "A0.x: %08lx  A0.w: %08lx  A1.x: %08lx  A1.w: %08lx\n",
	       regs->a0x, regs->a0w, regs->a1x, regs->a1w);
	printk(KERN_NOTICE "P0: %08lx  P1: %08lx  P2: %08lx  P3: %08lx\n",
	       regs->p0, regs->p1, regs->p2, regs->p3);
	printk(KERN_NOTICE "P4: %08lx  P5: %08lx\n", regs->p4, regs->p5);
	printk(KERN_NOTICE "R0: %08lx  R1: %08lx  R2: %08lx  R3: %08lx\n",
	       regs->r0, regs->r1, regs->r2, regs->r3);
	printk(KERN_NOTICE "R4: %08lx  R5: %08lx  R6: %08lx  R7: %08lx\n",
	       regs->r4, regs->r5, regs->r6, regs->r7);

	if (!regs->ipend)
		printk(KERN_NOTICE "USP: %08lx\n", rdusp());
}

/* Fill in the fpu structure for a core dump.  */

int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpregs)
{
	return 1;
}

/*
 * This gets run with P1 containing the
 * function to call, and R1 containing
 * the "args".  Note P0 is clobbered on the way here.
 */
void kernel_thread_helper(void);
__asm__(".section .text\n"
	".align 4\n"
	"_kernel_thread_helper:\n\t"
	"\tsp += -12;\n\t"
	"\tr0 = r1;\n\t" "\tcall (p1);\n\t" "\tcall _do_exit;\n" ".previous");

/*
 * Create a kernel thread.
 */
pid_t kernel_thread(int (*fn) (void *), void *arg, unsigned long flags)
{
	struct pt_regs regs;

	memset(&regs, 0, sizeof(regs));

	regs.r1 = (unsigned long)arg;
	regs.p1 = (unsigned long)fn;
	regs.pc = (unsigned long)kernel_thread_helper;
	regs.orig_p0 = -1;
	/* Set bit 2 to tell ret_from_fork we should be returning to kernel
	   mode.  */
	regs.ipend = 0x8002;
	__asm__ __volatile__("%0 = syscfg;":"=da"(regs.syscfg):);
	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,
		       NULL);
}

void flush_thread(void)
{
}

asmlinkage int bfin_vfork(struct pt_regs *regs)
{
	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL,
		       NULL);
}

asmlinkage int bfin_clone(struct pt_regs *regs)
{
	unsigned long clone_flags;
	unsigned long newsp;

	/* syscall2 puts clone_flags in r0 and usp in r1 */
	clone_flags = regs->r0;
	newsp = regs->r1;
	if (!newsp)
		newsp = rdusp();
	else
		newsp -= 12;
	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
}

int
copy_thread(int nr, unsigned long clone_flags,
	    unsigned long usp, unsigned long topstk,
	    struct task_struct *p, struct pt_regs *regs)
{
	struct pt_regs *childregs;

	childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
	*childregs = *regs;
	childregs->r0 = 0;

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

	return 0;
}

/*
 * fill in the user structure for a core dump..
 */
void dump_thread(struct pt_regs *regs, struct user *dump)
{
	dump->magic = CMAGIC;
	dump->start_code = 0;
	dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
	dump->u_tsize = ((unsigned long)current->mm->end_code) >> PAGE_SHIFT;
	dump->u_dsize = ((unsigned long)(current->mm->brk +
					 (PAGE_SIZE - 1))) >> PAGE_SHIFT;
	dump->u_dsize -= dump->u_tsize;
	dump->u_ssize = 0;

	if (dump->start_stack < TASK_SIZE)
		dump->u_ssize =
		    ((unsigned long)(TASK_SIZE -
				     dump->start_stack)) >> PAGE_SHIFT;

	dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);

	dump->regs.r0 = regs->r0;
	dump->regs.r1 = regs->r1;
	dump->regs.r2 = regs->r2;
	dump->regs.r3 = regs->r3;
	dump->regs.r4 = regs->r4;
	dump->regs.r5 = regs->r5;
	dump->regs.r6 = regs->r6;
	dump->regs.r7 = regs->r7;
	dump->regs.p0 = regs->p0;
	dump->regs.p1 = regs->p1;
	dump->regs.p2 = regs->p2;
	dump->regs.p3 = regs->p3;
	dump->regs.p4 = regs->p4;
	dump->regs.p5 = regs->p5;
	dump->regs.orig_p0 = regs->orig_p0;
	dump->regs.a0w = regs->a0w;
	dump->regs.a1w = regs->a1w;
	dump->regs.a0x = regs->a0x;
	dump->regs.a1x = regs->a1x;
	dump->regs.rets = regs->rets;
	dump->regs.astat = regs->astat;
	dump->regs.pc = regs->pc;
}

/*
 * sys_execve() executes a new program.
 */

asmlinkage int sys_execve(char *name, char **argv, char **envp)
{
	int error;
	char *filename;
	struct pt_regs *regs = (struct pt_regs *)((&name) + 6);

	lock_kernel();
	filename = getname(name);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;
	error = do_execve(filename, argv, envp, regs);
	putname(filename);
 out:
	unlock_kernel();
	return error;
}

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

void finish_atomic_sections (struct pt_regs *regs)
{
	if (regs->pc < ATOMIC_SEQS_START || regs->pc >= ATOMIC_SEQS_END)
		return;

	switch (regs->pc) {
	case ATOMIC_XCHG32 + 2:
		put_user(regs->r1, (int *)regs->p0);
		regs->pc += 2;
		break;

	case ATOMIC_CAS32 + 2:
	case ATOMIC_CAS32 + 4:
		if (regs->r0 == regs->r1)
			put_user(regs->r2, (int *)regs->p0);
		regs->pc = ATOMIC_CAS32 + 8;
		break;
	case ATOMIC_CAS32 + 6:
		put_user(regs->r2, (int *)regs->p0);
		regs->pc += 2;
		break;

	case ATOMIC_ADD32 + 2:
		regs->r0 = regs->r1 + regs->r0;
		/* fall through */
	case ATOMIC_ADD32 + 4:
		put_user(regs->r0, (int *)regs->p0);
		regs->pc = ATOMIC_ADD32 + 6;
		break;

	case ATOMIC_SUB32 + 2:
		regs->r0 = regs->r1 - regs->r0;
		/* fall through */
	case ATOMIC_SUB32 + 4:
		put_user(regs->r0, (int *)regs->p0);
		regs->pc = ATOMIC_SUB32 + 6;
		break;

	case ATOMIC_IOR32 + 2:
		regs->r0 = regs->r1 | regs->r0;
		/* fall through */
	case ATOMIC_IOR32 + 4:
		put_user(regs->r0, (int *)regs->p0);
		regs->pc = ATOMIC_IOR32 + 6;
		break;

	case ATOMIC_AND32 + 2:
		regs->r0 = regs->r1 & regs->r0;
		/* fall through */
	case ATOMIC_AND32 + 4:
		put_user(regs->r0, (int *)regs->p0);
		regs->pc = ATOMIC_AND32 + 6;
		break;

	case ATOMIC_XOR32 + 2:
		regs->r0 = regs->r1 ^ regs->r0;
		/* fall through */
	case ATOMIC_XOR32 + 4:
		put_user(regs->r0, (int *)regs->p0);
		regs->pc = ATOMIC_XOR32 + 6;
		break;
	}
}

#if defined(CONFIG_ACCESS_CHECK)
int _access_ok(unsigned long addr, unsigned long size)
{

	if (addr > (addr + size))
		return 0;
	if (segment_eq(get_fs(), KERNEL_DS))
		return 1;
#ifdef CONFIG_MTD_UCLINUX
	if (addr >= memory_start && (addr + size) <= memory_end)
		return 1;
	if (addr >= memory_mtd_end && (addr + size) <= physical_mem_end)
		return 1;
#else
	if (addr >= memory_start && (addr + size) <= physical_mem_end)
		return 1;
#endif
	if (addr >= (unsigned long)__init_begin &&
	    addr + size <= (unsigned long)__init_end)
		return 1;
	if (addr >= L1_SCRATCH_START
	    && addr + size <= L1_SCRATCH_START + L1_SCRATCH_LENGTH)
		return 1;
#if L1_CODE_LENGTH != 0
	if (addr >= L1_CODE_START + (_etext_l1 - _stext_l1)
	    && addr + size <= L1_CODE_START + L1_CODE_LENGTH)
		return 1;
#endif
#if L1_DATA_A_LENGTH != 0
	if (addr >= L1_DATA_A_START + (_ebss_l1 - _sdata_l1)
	    && addr + size <= L1_DATA_A_START + L1_DATA_A_LENGTH)
		return 1;
#endif
#if L1_DATA_B_LENGTH != 0
	if (addr >= L1_DATA_B_START
	    && addr + size <= L1_DATA_B_START + L1_DATA_B_LENGTH)
		return 1;
#endif
	return 0;
}
EXPORT_SYMBOL(_access_ok);
#endif /* CONFIG_ACCESS_CHECK */
Commit	Line	Data
1394f032 BW	1	/*
	2	* File: arch/blackfin/kernel/process.c
	3	* Based on:
	4	* Author:
	5	*
	6	* Created:
	7	* Description: Blackfin architecture-dependent process handling.
	8	*
	9	* Modified:
	10	* Copyright 2004-2006 Analog Devices Inc.
	11	*
	12	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2 of the License, or
	17	* (at your option) any later version.
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, see the file COPYING, or write
	26	* to the Free Software Foundation, Inc.,
	27	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	28	*/
	29
	30	#include <linux/module.h>
	31	#include <linux/smp_lock.h>
	32	#include <linux/unistd.h>
	33	#include <linux/user.h>
	34	#include <linux/a.out.h>
1f83b8f1	35	#include <linux/uaccess.h>
1394f032 BW	36
1394f032 BW	37	#include <asm/blackfin.h>
7adfb58f	38	#include <asm/fixed_code.h>
1394f032 BW	39
	40	#define LED_ON 0
	41	#define LED_OFF 1
	42
	43	asmlinkage void ret_from_fork(void);
	44
	45	/* Points to the SDRAM backup memory for the stack that is currently in
	46	* L1 scratchpad memory.
	47	*/
	48	void *current_l1_stack_save;
	49
	50	/* The number of tasks currently using a L1 stack area. The SRAM is
	51	* allocated/deallocated whenever this changes from/to zero.
	52	*/
	53	int nr_l1stack_tasks;
	54
	55	/* Start and length of the area in L1 scratchpad memory which we've allocated
	56	* for process stacks.
	57	*/
	58	void *l1_stack_base;
	59	unsigned long l1_stack_len;
	60
	61	/*
	62	* Powermanagement idle function, if any..
	63	*/
	64	void (*pm_idle)(void) = NULL;
	65	EXPORT_SYMBOL(pm_idle);
	66
	67	void (*pm_power_off)(void) = NULL;
	68	EXPORT_SYMBOL(pm_power_off);
	69
	70	/*
	71	* We are using a different LED from the one used to indicate timer interrupt.
	72	*/
	73	#if defined(CONFIG_BFIN_IDLE_LED)
	74	static inline void leds_switch(int flag)
	75	{
	76	unsigned short tmp = 0;
	77
	78	tmp = bfin_read_CONFIG_BFIN_IDLE_LED_PORT();
	79	SSYNC();
	80
	81	if (flag == LED_ON)
	82	tmp &= ~CONFIG_BFIN_IDLE_LED_PIN; /* light on */
	83	else
	84	tmp \|= CONFIG_BFIN_IDLE_LED_PIN; /* light off */
	85
	86	bfin_write_CONFIG_BFIN_IDLE_LED_PORT(tmp);
	87	SSYNC();
	88
	89	}
	90	#else
	91	static inline void leds_switch(int flag)
	92	{
	93	}
	94	#endif
	95
	96	/*
	97	* The idle loop on BFIN
	98	*/
	99	#ifdef CONFIG_IDLE_L1
	100	void default_idle(void)__attribute__((l1_text));
	101	void cpu_idle(void)__attribute__((l1_text));
	102	#endif
103
104	void default_idle(void)
105	{
106	while (!need_resched()) {
107	leds_switch(LED_OFF);
108	local_irq_disable();
109	if (likely(!need_resched()))
110	idle_with_irq_disabled();
111	local_irq_enable();
112	leds_switch(LED_ON);
113	}
114	}
115
116	void (*idle)(void) = default_idle;
117
118	/*
119	* The idle thread. There's no useful work to be
120	* done, so just try to conserve power and have a
121	* low exit latency (ie sit in a loop waiting for
122	* somebody to say that they'd like to reschedule)
123	*/
124	void cpu_idle(void)
125	{
126	/* endless idle loop with no priority at all */
127	while (1) {
128	idle();
129	preempt_enable_no_resched();
130	schedule();
131	preempt_disable();
132	}
133	}
134
135	void machine_restart(char *__unused)
136	{
137	#if defined(CONFIG_BLKFIN_CACHE)
138	bfin_write_IMEM_CONTROL(0x01);
139	SSYNC();
140	#endif
141	bfin_reset();
142	/* Dont do anything till the reset occurs */
143	while (1) {
144	SSYNC();
145	}
146	}
147
148	void machine_halt(void)
149	{
150	for (;;)
151	asm volatile ("idle");
152	}
153
154	void machine_power_off(void)
155	{
156	for (;;)
157	asm volatile ("idle");
158	}
159
160	void show_regs(struct pt_regs *regs)
161	{
162	printk(KERN_NOTICE "\n");
163	printk(KERN_NOTICE
164	"PC: %08lu Status: %04lu SysStatus: %04lu RETS: %08lu\n",
165	regs->pc, regs->astat, regs->seqstat, regs->rets);
166	printk(KERN_NOTICE
167	"A0.x: %08lx A0.w: %08lx A1.x: %08lx A1.w: %08lx\n",
168	regs->a0x, regs->a0w, regs->a1x, regs->a1w);
169	printk(KERN_NOTICE "P0: %08lx P1: %08lx P2: %08lx P3: %08lx\n",
170	regs->p0, regs->p1, regs->p2, regs->p3);
171	printk(KERN_NOTICE "P4: %08lx P5: %08lx\n", regs->p4, regs->p5);
172	printk(KERN_NOTICE "R0: %08lx R1: %08lx R2: %08lx R3: %08lx\n",
173	regs->r0, regs->r1, regs->r2, regs->r3);
174	printk(KERN_NOTICE "R4: %08lx R5: %08lx R6: %08lx R7: %08lx\n",
175	regs->r4, regs->r5, regs->r6, regs->r7);
176
1f83b8f1 MF	177	if (!regs->ipend)
1f83b8f1 MF	178	printk(KERN_NOTICE "USP: %08lx\n", rdusp());
1394f032 BW	179	}
	180
	181	/* Fill in the fpu structure for a core dump. */
	182
	183	int dump_fpu(struct pt_regs regs, elf_fpregset_t fpregs)
	184	{
	185	return 1;
	186	}
	187
	188	/*
	189	* This gets run with P1 containing the
	190	* function to call, and R1 containing
	191	* the "args". Note P0 is clobbered on the way here.
	192	*/
	193	void kernel_thread_helper(void);
	194	__asm__(".section .text\n"
	195	".align 4\n"
	196	"_kernel_thread_helper:\n\t"
	197	"\tsp += -12;\n\t"
	198	"\tr0 = r1;\n\t" "\tcall (p1);\n\t" "\tcall _do_exit;\n" ".previous");
	199
	200	/*
	201	* Create a kernel thread.
	202	*/
	203	pid_t kernel_thread(int (fn) (void ), void *arg, unsigned long flags)
	204	{
	205	struct pt_regs regs;
	206
	207	memset(&regs, 0, sizeof(regs));
	208
	209	regs.r1 = (unsigned long)arg;
	210	regs.p1 = (unsigned long)fn;
	211	regs.pc = (unsigned long)kernel_thread_helper;
	212	regs.orig_p0 = -1;
	213	/* Set bit 2 to tell ret_from_fork we should be returning to kernel
	214	mode. */
	215	regs.ipend = 0x8002;
	216	__asm__ __volatile__("%0 = syscfg;":"=da"(regs.syscfg):);
	217	return do_fork(flags \| CLONE_VM \| CLONE_UNTRACED, 0, &regs, 0, NULL,
	218	NULL);
	219	}
	220
	221	void flush_thread(void)
	222	{
	223	}
	224
	225	asmlinkage int bfin_vfork(struct pt_regs *regs)
	226	{
	227	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, rdusp(), regs, 0, NULL,
	228	NULL);
	229	}
	230
	231	asmlinkage int bfin_clone(struct pt_regs *regs)
	232	{
	233	unsigned long clone_flags;
	234	unsigned long newsp;
	235
	236	/* syscall2 puts clone_flags in r0 and usp in r1 */
	237	clone_flags = regs->r0;
	238	newsp = regs->r1;
	239	if (!newsp)
	240	newsp = rdusp();
	241	else
	242	newsp -= 12;
243	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
244	}
245
246	int
247	copy_thread(int nr, unsigned long clone_flags,
248	unsigned long usp, unsigned long topstk,
249	struct task_struct p, struct pt_regs regs)
250	{
251	struct pt_regs *childregs;
252
253	childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
254	childregs = regs;
255	childregs->r0 = 0;
256
257	p->thread.usp = usp;
258	p->thread.ksp = (unsigned long)childregs;
259	p->thread.pc = (unsigned long)ret_from_fork;
260
261	return 0;
262	}
263
264	/*
265	* fill in the user structure for a core dump..
266	*/
267	void dump_thread(struct pt_regs regs, struct user dump)
268	{
269	dump->magic = CMAGIC;
270	dump->start_code = 0;
271	dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
272	dump->u_tsize = ((unsigned long)current->mm->end_code) >> PAGE_SHIFT;
273	dump->u_dsize = ((unsigned long)(current->mm->brk +
274	(PAGE_SIZE - 1))) >> PAGE_SHIFT;
275	dump->u_dsize -= dump->u_tsize;
276	dump->u_ssize = 0;
277
278	if (dump->start_stack < TASK_SIZE)
279	dump->u_ssize =
280	((unsigned long)(TASK_SIZE -
281	dump->start_stack)) >> PAGE_SHIFT;
282
283	dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);
284
285	dump->regs.r0 = regs->r0;
286	dump->regs.r1 = regs->r1;
287	dump->regs.r2 = regs->r2;
288	dump->regs.r3 = regs->r3;
289	dump->regs.r4 = regs->r4;
290	dump->regs.r5 = regs->r5;
291	dump->regs.r6 = regs->r6;
292	dump->regs.r7 = regs->r7;
293	dump->regs.p0 = regs->p0;
294	dump->regs.p1 = regs->p1;
295	dump->regs.p2 = regs->p2;
296	dump->regs.p3 = regs->p3;
297	dump->regs.p4 = regs->p4;
298	dump->regs.p5 = regs->p5;
299	dump->regs.orig_p0 = regs->orig_p0;
300	dump->regs.a0w = regs->a0w;
301	dump->regs.a1w = regs->a1w;
302	dump->regs.a0x = regs->a0x;
303	dump->regs.a1x = regs->a1x;
304	dump->regs.rets = regs->rets;
305	dump->regs.astat = regs->astat;
306	dump->regs.pc = regs->pc;
307	}
308
309	/*
310	* sys_execve() executes a new program.
311	*/
312
313	asmlinkage int sys_execve(char name, char argv, char *envp)
314	{
315	int error;
316	char *filename;
317	struct pt_regs regs = (struct pt_regs )((&name) + 6);
318
319	lock_kernel();
320	filename = getname(name);
321	error = PTR_ERR(filename);
322	if (IS_ERR(filename))
323	goto out;
324	error = do_execve(filename, argv, envp, regs);
325	putname(filename);
1f83b8f1	326	out:
1394f032 BW	327	unlock_kernel();
	328	return error;
	329	}
	330
	331	unsigned long get_wchan(struct task_struct *p)
	332	{
	333	unsigned long fp, pc;
	334	unsigned long stack_page;
	335	int count = 0;
	336	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	337	return 0;
	338
	339	stack_page = (unsigned long)p;
	340	fp = p->thread.usp;
	341	do {
	342	if (fp < stack_page + sizeof(struct thread_info) \|\|
	343	fp >= 8184 + stack_page)
	344	return 0;
	345	pc = ((unsigned long *)fp)[1];
	346	if (!in_sched_functions(pc))
	347	return pc;
	348	fp = (unsigned long )fp;
	349	}
	350	while (count++ < 16);
	351	return 0;
	352	}
	353
7adfb58f BS	354	void finish_atomic_sections (struct pt_regs *regs)
	355	{
	356	if (regs->pc < ATOMIC_SEQS_START \|\| regs->pc >= ATOMIC_SEQS_END)
	357	return;
	358
	359	switch (regs->pc) {
	360	case ATOMIC_XCHG32 + 2:
	361	put_user(regs->r1, (int *)regs->p0);
	362	regs->pc += 2;
	363	break;
	364
	365	case ATOMIC_CAS32 + 2:
	366	case ATOMIC_CAS32 + 4:
	367	if (regs->r0 == regs->r1)
	368	put_user(regs->r2, (int *)regs->p0);
	369	regs->pc = ATOMIC_CAS32 + 8;
	370	break;
	371	case ATOMIC_CAS32 + 6:
	372	put_user(regs->r2, (int *)regs->p0);
	373	regs->pc += 2;
	374	break;
	375
	376	case ATOMIC_ADD32 + 2:
	377	regs->r0 = regs->r1 + regs->r0;
	378	/* fall through */
	379	case ATOMIC_ADD32 + 4:
	380	put_user(regs->r0, (int *)regs->p0);
	381	regs->pc = ATOMIC_ADD32 + 6;
	382	break;
	383
	384	case ATOMIC_SUB32 + 2:
	385	regs->r0 = regs->r1 - regs->r0;
	386	/* fall through */
	387	case ATOMIC_SUB32 + 4:
	388	put_user(regs->r0, (int *)regs->p0);
	389	regs->pc = ATOMIC_SUB32 + 6;
	390	break;
	391
	392	case ATOMIC_IOR32 + 2:
	393	regs->r0 = regs->r1 \| regs->r0;
	394	/* fall through */
	395	case ATOMIC_IOR32 + 4:
	396	put_user(regs->r0, (int *)regs->p0);
	397	regs->pc = ATOMIC_IOR32 + 6;
	398	break;
	399
	400	case ATOMIC_AND32 + 2:
	401	regs->r0 = regs->r1 & regs->r0;
	402	/* fall through */
	403	case ATOMIC_AND32 + 4:
	404	put_user(regs->r0, (int *)regs->p0);
	405	regs->pc = ATOMIC_AND32 + 6;
	406	break;
	407
	408	case ATOMIC_XOR32 + 2:
	409	regs->r0 = regs->r1 ^ regs->r0;
	410	/* fall through */
	411	case ATOMIC_XOR32 + 4:
	412	put_user(regs->r0, (int *)regs->p0);
	413	regs->pc = ATOMIC_XOR32 + 6;
	414	break;
	415	}
	416	}
	417
1394f032 BW	418	#if defined(CONFIG_ACCESS_CHECK)
	419	int _access_ok(unsigned long addr, unsigned long size)
	420	{
	421
	422	if (addr > (addr + size))
	423	return 0;
1f83b8f1	424	if (segment_eq(get_fs(), KERNEL_DS))
1394f032 BW	425	return 1;
	426	#ifdef CONFIG_MTD_UCLINUX
	427	if (addr >= memory_start && (addr + size) <= memory_end)
	428	return 1;
	429	if (addr >= memory_mtd_end && (addr + size) <= physical_mem_end)
	430	return 1;
	431	#else
	432	if (addr >= memory_start && (addr + size) <= physical_mem_end)
	433	return 1;
	434	#endif
	435	if (addr >= (unsigned long)__init_begin &&
	436	addr + size <= (unsigned long)__init_end)
	437	return 1;
	438	if (addr >= L1_SCRATCH_START
	439	&& addr + size <= L1_SCRATCH_START + L1_SCRATCH_LENGTH)
	440	return 1;
	441	#if L1_CODE_LENGTH != 0
	442	if (addr >= L1_CODE_START + (_etext_l1 - _stext_l1)
	443	&& addr + size <= L1_CODE_START + L1_CODE_LENGTH)
	444	return 1;
	445	#endif
	446	#if L1_DATA_A_LENGTH != 0
	447	if (addr >= L1_DATA_A_START + (_ebss_l1 - _sdata_l1)
	448	&& addr + size <= L1_DATA_A_START + L1_DATA_A_LENGTH)
	449	return 1;
	450	#endif
	451	#if L1_DATA_B_LENGTH != 0
	452	if (addr >= L1_DATA_B_START
	453	&& addr + size <= L1_DATA_B_START + L1_DATA_B_LENGTH)
	454	return 1;
	455	#endif
	456	return 0;
	457	}
	458	EXPORT_SYMBOL(_access_ok);
	459	#endif /* CONFIG_ACCESS_CHECK */