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Commit 1000197d authored by Ley Foon Tan's avatar Ley Foon Tan
Browse files

nios2: System calls handling 



This patch adds support for system calls from userspaces. It uses the
asm-generic/unistd.h definitions with architecture spcific syscall.
The sys_call_table is just an array defined in a C file and it contains
pointers to the syscall functions.

Signed-off-by: default avatarLey Foon Tan <lftan@altera.com>
parent 19f4c6b5

arch/nios2/include/asm/syscall.h

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+138 −0
Original line number Diff line number Diff line 
/*

 * Copyright Altera Corporation (C) <2014>. All rights reserved

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.

 */



#ifndef __ASM_NIOS2_SYSCALL_H__

#define __ASM_NIOS2_SYSCALL_H__



#include <linux/err.h>

#include <linux/sched.h>



static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)

{

	return regs->r2;

}



static inline void syscall_rollback(struct task_struct *task,

				struct pt_regs *regs)

{

	regs->r2 = regs->orig_r2;

	regs->r7 = regs->orig_r7;

}



static inline long syscall_get_error(struct task_struct *task,

				struct pt_regs *regs)

{

	return regs->r7 ? regs->r2 : 0;

}



static inline long syscall_get_return_value(struct task_struct *task,

	struct pt_regs *regs)

{

	return regs->r2;

}



static inline void syscall_set_return_value(struct task_struct *task,

	struct pt_regs *regs, int error, long val)

{

	if (error) {

		/* error < 0, but nios2 uses > 0 return value */

		regs->r2 = -error;

		regs->r7 = 1;

	} else {

		regs->r2 = val;

		regs->r7 = 0;

	}

}



static inline void syscall_get_arguments(struct task_struct *task,

	struct pt_regs *regs, unsigned int i, unsigned int n,

	unsigned long *args)

{

	BUG_ON(i + n > 6);



	switch (i) {

	case 0:

		if (!n--)

			break;

		*args++ = regs->r4;

	case 1:

		if (!n--)

			break;

		*args++ = regs->r5;

	case 2:

		if (!n--)

			break;

		*args++ = regs->r6;

	case 3:

		if (!n--)

			break;

		*args++ = regs->r7;

	case 4:

		if (!n--)

			break;

		*args++ = regs->r8;

	case 5:

		if (!n--)

			break;

		*args++ = regs->r9;

	case 6:

		if (!n--)

			break;

	default:

		BUG();

	}

}



static inline void syscall_set_arguments(struct task_struct *task,

	struct pt_regs *regs, unsigned int i, unsigned int n,

	const unsigned long *args)

{

	BUG_ON(i + n > 6);



	switch (i) {

	case 0:

		if (!n--)

			break;

		regs->r4 = *args++;

	case 1:

		if (!n--)

			break;

		regs->r5 = *args++;

	case 2:

		if (!n--)

			break;

		regs->r6 = *args++;

	case 3:

		if (!n--)

			break;

		regs->r7 = *args++;

	case 4:

		if (!n--)

			break;

		regs->r8 = *args++;

	case 5:

		if (!n--)

			break;

		regs->r9 = *args++;

	case 6:

		if (!n)

			break;

	default:

		BUG();

	}

}



#endif

arch/nios2/include/asm/syscalls.h

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Original line number Diff line number Diff line 
/*

 * Copyright Altera Corporation (C) 2013. All rights reserved

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.

 *

 */

#ifndef __ASM_NIOS2_SYSCALLS_H

#define __ASM_NIOS2_SYSCALLS_H



int sys_cacheflush(unsigned long addr, unsigned long len,

				unsigned int op);



#include <asm-generic/syscalls.h>



#endif /* __ASM_NIOS2_SYSCALLS_H */

arch/nios2/include/uapi/asm/unistd.h

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Original line number Diff line number Diff line 
/*

 * Copyright (C) 2013 Altera Corporation

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.

 *

 */



 #define sys_mmap2 sys_mmap_pgoff



/* Use the standard ABI for syscalls */

#include <asm-generic/unistd.h>



/* Additional Nios II specific syscalls. */

#define __NR_cacheflush (__NR_arch_specific_syscall)

__SYSCALL(__NR_cacheflush, sys_cacheflush)

arch/nios2/kernel/sys_nios2.c

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Original line number Diff line number Diff line 
/*

 * Copyright (C) 2013 Altera Corporation

 * Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch>

 * 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/file.h>

#include <linux/fs.h>

#include <linux/slab.h>

#include <linux/syscalls.h>



#include <asm/cacheflush.h>

#include <asm/traps.h>



/* sys_cacheflush -- flush the processor cache. */

asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,

				unsigned int op)

{

	struct vm_area_struct *vma;



	if (len == 0)

		return 0;



	/* We only support op 0 now, return error if op is non-zero.*/

	if (op)

		return -EINVAL;



	/* Check for overflow */

	if (addr + len < addr)

		return -EFAULT;



	/*

	 * Verify that the specified address region actually belongs

	 * to this process.

	 */

	vma = find_vma(current->mm, addr);

	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)

		return -EFAULT;



	flush_cache_range(vma, addr, addr + len);



	return 0;

}



asmlinkage int sys_getpagesize(void)

{

	return PAGE_SIZE;

}

arch/nios2/kernel/syscall_table.c

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Original line number Diff line number Diff line 
/*

 * Copyright Altera Corporation (C) 2013. All rights reserved

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.

 *

 */



#include <linux/syscalls.h>

#include <linux/signal.h>

#include <linux/unistd.h>



#include <asm/syscalls.h>



#undef __SYSCALL

#define __SYSCALL(nr, call) [nr] = (call),



void *sys_call_table[__NR_syscalls] = {

#include <asm/unistd.h>

};